# Patent

## Title
Endothelial cell expression patterns

## Abstract

To gain a better understanding of tumor angiogenesis, new techniques for isolating endothelial cells (ECs) and evaluating gene expression patterns were developed. When transcripts from ECs derived from normal and malignant colorectal tissues were compared with transcripts from non-endothelial cells, over 170 genes predominantly expressed in the endothelium were identified. Comparison between normal- and tumor-derived endothelium revealed 79 differentially expressed genes, including 46 that were specifically elevated in tumor-associated endothelium. Experiments with representative genes from this group demonstrated that most were similarly expressed in the endothelium of primary lung, breast, brain, and pancreatic cancers as well as in metastatic lesions of the liver. These results demonstrate that neoplastic and normal endothelium in humans are distinct at the molecular level, and have significant implications for the development of anti-angiogenic therapies in the future.

## Background
This application is a continuation of U.S. Ser. No. 09/918,715, filed Aug. 1, 2001. This application claims the benefit of provisional applications Ser. Nos. 60/222,599 filed Aug. 2, 2000, 60/224,360 filed Aug. 11, 2000, and 60/282,850 filed Apr. 11, 2001, the disclosures of which are expressly incorporated herein.


The U.S. government retains certain rights in the invention by virtue of the provisions of National Institutes of Heath grants CA57345 and CA43460, which supported this work.


TECHNICAL FIELD OF THE INVENTION
This invention is related to the area of angiogenesis and anti-angiogenesis. In particular, it relates to genes which are characteristically expressed in tumor endothelial and normal endothelial cells.
BACKGROUND OF THE INVENTION
It is now widely recognized that tumors require a blood supply for expansive growth. This recognition has stimulated a profusion of research on tumor angiogenesis, based on the idea that the vasculature in tumors represents a potential therapeutic target. However, several basic questions about tumor endothelium remain unanswered. For example, are vessels of tumors qualitatively different from normal vessels of the same tissue? What is the relationship of tumor endothelium to endothelium of healing wounds or other physiological or pathological forms of angiogenesis? The answers to these questions critically impact on the potential for new therapeutic approaches to inhibit angiogenesis in a specific manner.
There is a continuing need in the art to characterize the vasculature of tumors relative to normal vasculature so that any differences can be exploited for therapeutic and diagnostic benefits.
One technique which can be used to characterize gene expression, or more precisely gene transcription, is termed serial analysis of gene expression (SAGE). Briefly, the SAGE approach is a method for the rapid quantitative and qualitative analysis of mRNA transcripts based upon the isolation and analysis of short defined sequence tags (SAGE Tags) corresponding to expressed genes. Each Tag is a short nucleotide sequences (9-17 base pairs in length) from a defined position in the transcript. In the SAGE method, the Tags are dimerized to reduce bias inherent in cloning or amplification reactions. (See, U.S. Pat. No. 5,695,937) SAGE is particularly suited to the characterization of genes associated with vasculature stimulation or inhibition because it is capable of detecting rare sequences, evaluating large numbers of sequences at one time, and to provide a basis for the identification of previously unknown genes.
SUMMARY OF THE INVENTION
One embodiment of the invention provides an isolated molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 17, 19, and 44, as shown in SEQ ID NO: 196, 200, 212, 230, 232, and 271, respectively. The molecule can be, for example, an in tact antibody molecule, a single chain variable region (ScFv), a monoclonal antibody, a humanized antibody, or a human antibody. The molecule can optionally be bound to a cytotoxic moiety, bound to a therapeutic moiety, bound to a detectable moiety, or bound to an anti-tumor agent.
According to another embodiment of the invention a method of inhibiting neoangiogenesis is provided. An effective amount of an isolated molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 17, 19, 22, and 44, as shown in SEQ ID NO: 196, 200, 212, 230, 232, 238, and 271, respectively, is administered to a subject in need thereof. Neoangiogenesis is consequently inhibited. The subject may bear a vascularized tumor, may have polycystic kidney disease, may have diabetic retinopathy, may have rheumatoid arthritis, may have psoriasis, for example.
Another aspect of the invention is a method of inhibiting tumor growth. An effective amount of an isolated molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 17, 19, 22, and 44, as shown in SEQ ID NO: 196, 200, 212, 230, 232, 238, and 271, respectively, is administered to a human subject bearing a tumor. The growth of the tumor is consequently inhibited.
Still another aspect of the invention provides an isolated molecule comprising an antibody variable region which specifically binds to a TEM protein selected from the group consisting of: 3, 9, 17, 19, and 44, as shown in SEQ ID NO: 200, 212, 230, 232, and 271, respectively. The molecule can be, for example, an in tact antibody molecule, a single chain variable region (ScFv), a monoclonal antibody, a humanized antibody, or a human antibody. The molecule can optionally be bound to a cytotoxic moiety, bound to a therapeutic moiety, bound to a detectable moiety, or bound to an anti-tumor agent.
According to still another aspect of the invention an isolated and purified human transmembrane protein is provided. The protein is selected from the group consisting of: TEM 3, 9, 17, and 19 as shown in SEQ ID NO: 200, 212, 230, and 232, respectively.
Yet another aspect of the invention is an isolated and purified nucleic acid molecule comprising a coding sequence for a transmembrane TEM selected from the group consisting of: TEM 3, 9, 17, and 19 as shown in SEQ ID NO: 200, 212, 230, and 232, respectively. The isolated and purified nucleic acid molecule may optionally comprise a coding sequence selected from those shown in SEQ ID NO: 199, 211, 229, and 231.
Still another aspect of the invention is a recombinant host cell which comprises a nucleic acid molecule. The nucleic acid molecule comprises a coding sequence for a transmembrane TEM selected from the group consisting of: TEM 3, 9, 17, and 19 as shown in SEQ ID NO: 200, 212, 230, and 232, respectively. The recombinant host cell optionally comprises a coding sequence selected from those shown in SEQ ID NO: 199, 211, 229, and 231.
According to one embodiment of the invention a method is provided for inducing an immune response in a mammal. A nucleic acid molecule comprising a coding sequence for a human transmembrane protein selected from the group consisting of: TEM 1, 3, 9, 13, 17, 19, 22, 30, and 44 as shown in SEQ ID NO: 196, 200. 212, 220, 230, 232, 238, 250, and 271, respectively, is administered to the mammal. An immune response to the human transmembrane protein is thereby induced in the mammal. Optionally the coding sequence is shown in SEQ ID NO: 196, 200, 212, 220, 230, 232, 238, 250 and 271.
According to yet another embodiment of the invention a method of inducing an immune response in a mammal is provided. A purified human transmembrane protein selected from the group consisting of: TEM 1, 3, 9, 13, 17, 19, 22, 30, and 44 as shown in SEQ ID NO: 196, 200, 212, 220, 230, 232, 238, 250 and 271, respectively, is administered to the mammal. An immune response to the human transmembrane protein is thereby induced in the mammal.
Another aspect of the invention is a method for identification of a ligand involved in endothelial cell regulation. A test compound is contacted with an isolated and purified human trasmembrane protein selected from the group consisting of 1, 3, 9, 13, 17, 30, 19, and 44 as shown in SEQ ID NO: 196, 200, 212, 220, 230, 232, 250, and 271. The isolated and purified human trasmembrane protein is also contacted with a molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 13, 17, 30, 19, and 44 as shown in SEQ ID NO: 196, 200, 212, 220, 230, 232, 250, and 271 respectively. Binding of the molecule comprising an antibody variable region to the human transmembrane protein is determined. A test compound which diminishes the binding of the molecule comprising an antibody variable region to the human transmembrane protein is identified as a ligand involved in endothelial cell regulation.
Yet another aspect of the invention is a method for identification of a ligand involved in endothelial cell regulation. A test compound is contacted with a cell comprising a human transmembrane protein selected from the group consisting of 1, 3, 9, 17, and 19 as shown in SEQ ID NO: 196, 200, 212, 230, and 232. The cell is also contacted with a molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 17, and 19 as shown in SEQ ID NO: 196, 200, 212, 230, and 232, respectively. Binding of the molecule comprising an antibody variable region to the cell is determined. A test compound which diminishes the binding of the molecule comprising an antibody variable region to the cell is identified as a ligand involved in endothelial cell regulation.
Yet another aspect of the invention is a method for identification of a ligand involved in endothelial cell regulation. A test compound is contacted with a human transmembrane protein selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 40, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275. Binding of a test compound to the human transmembrane protein is determined. A test compound which binds to the protein is identified as a ligand involved in endothelial cell regulation.
Another embodiment of the present invention is a soluble form of a human transmembrane protein selected from the group consisting of: TEM 1, 3, 9, 17, 19, 22, 30, and 44 as shown in SEQ ID NO: 196, 200, 212, 230, 232, 238, 250, and 271 respectively. The soluble forms lack transmembrane domains. The soluble form may consist of an extracellular domain of the human transmembrane protein.
Also provided by the present invention is a method of inhibiting neoangiogenesis in a patient. A soluble form of a human transmembrane protein is adminstered to the patient. Neoangiogenesis in the patient is consequently inhibited. The patient may bear a vascularized tumor, may have polycystic kidney disease, may have diabetic retinopathy, may have rheumatoid arthritis, or may have psoriasis, for example.
Another embodiment of the invention provides a method of inhibiting neoangiogenesis in a patient. A soluble form of a human transmembrane protein is administered to the patient. Neoangiogenesis in the patient is consequently inhibited. The patient may bear a vascularized tumor, may have polycystic kidney disease, may have diabetic retinopathy, may have rheumatoid arthritis, or may have psoriasis, for example.
According to still another aspect of the invention a method of identifying regions of neoangiogenesis in a patient is provided. A molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 13, 17, 19, 22, 30, and 44, as shown in SEQ ID NO: 196, 200, 212, 220, 230, 232, 238, 250, and 271, respectively, is administered to a patient. The molecule is bound to a detectable moiety. The detectable moiety is detected in the patient, thereby identifying neoangiogenesis.
According to another aspect of the invention a method is provided for inducing an immune response to tumor endothelial cells in a patient. A mouse TEM protein selected from the group consisting of: 1, 2, 3, 9, 13, 17, 19, 22, and 30 as shown in SEQ ID NO: 291, 293, 299, 295, 303, 297, 301, 305, and 307, is administered to a patient in need thereof. An immune response to a human TEM protein is consequently induced.
Still another embodiment of the invention is a method of screening for neoangiogenesis in a patient. A body fluid collected from the patient is contacted with a molecule comprising an antibody variable region which specifically binds to an extracellular domain of a TEM protein selected from the group consisting of: 1, 3, 9, 17, 19, and 44, as shown in SEQ ID NO: 196, 200, 212, 230, 232, and 271, respectively. Detection of cross-reactive material in the body fluid with the molecule indicates neo-angiogenesis in the patient.
Still another embodiment of the invention provides a method of inhibiting neoangiogenesis in a patient. A molecule comprising an antibody variable region which specifically binds to a TEM protein selected from the group consisting of: 4, 6, 7, 10, 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40 as shown in SEQ ID NO: 202, 206, 208, 214, 218, 223 and 224, 234, 242, 244, 252, 257, 259, 261, 263, and 265, is administered to the patient. Neoangiogenesis in the patient consequently inhibited.
Yet another aspect of the invention is a method of screening for neoangiogenesis in a patient. A body fluid collected from the patient is contacted with a molecule comprising an antibody variable region which specifically binds to a TEM protein selected from the group consisting of: 4, 6, 7, 10, 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40, as shown in SEQ ID NO: 202, 206, 208, 214, 218, 223 & 224, 234, 242, 244, 252, 257, 259, 261, 263, and 265, respectively. Detection of cross-reactive material in the body fluid with the molecule indicates neoangiogenesis in the patient.
Also provided by the present invention is a method of promoting neoangiogenesis in a patient. A TEM protein selected from the group consisting of: 4, 6, 7, 10, 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40, as shown in SEQ ID NO: 202, 206, 208, 214, 218, 223 & 224, 234, 242, 244, 252, 257, 259, 261, 263, and 265, is administered to a patient in need of neoangiogenesis. Neoangiogenesis in the patient is consequently stimulated.
One embodiment of the invention provides a method of promoting neoangiogenesis in a patient. A nucleic acid molecule encoding a TEM protein selected from the group consisting of: 4, 6, 7, 10, 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40, as shown in SEQ ID NO: 201, 205, 207, 213, 217, 221 & 222, 233, 241, 243, 251, 256, 258, 260, 262, and 264, is administered to a patient in need of neoangiogenesis. The TEM protein is consequently expressed and neoangiogenesis in the patient is stimulated.
Another embodiment of the invention provides a method of screening for neoangiogenesis in a patient. A TEM protein selected from the group consisting of: 4, 6, 7, 10, 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40, as shown in SEQ ID NO: 202, 206, 208, 214, 218, 223 & 224, 234, 242, 244, 252, 257, 259, 261, 263, and 265, respectively, is detected in a body fluid collected from the patient. Detection of the TEM protein indicates neoangiogenesis in the patient.
Another aspect of the invention is a method of screening for neoangiogenesis in a patient. A nucleic acid encoding a TEM protein selected from the group consisting of: 4, 6, 7, 10; 12, 14, 20, 25, 27, 31, 36, 37, 38, 39, and 40 is detected in a body fluid collected from the patient. The nucleic acid is selected from the group consisting of those shown in SEQ ID NO: 201, 205, 207, 213, 217, 221 & 222, 233, 241, 243, 251, 256, 258, 260, 262, and 264. Detection of the TEM protein indicates neoangiogenesis in the patient.
Yet another embodiment of the invention is an isolated and purified nucleic acid molecule which encodes a NEM protein selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289. The nucleic acid molecule optionally comprises a coding sequence as shown in SEQ ID NO: 278, 282, 284, and 288. The nucleic acid may be maintained in a recombinant host cell.
The present invention also provides an isolated and purified NEM protein selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289.
The present invention further provides an isolated molecule comprising an antibody variable region which specifically binds to a NEM protein selected from the group consisting of: 14, 22, 23, and 33, as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289.
An additional embodiment of the present invention is a method of inhibiting neoangiogenesis. An effective amount of a NEM protein selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289 is administered to a subject in need thereof Neoangiogenesis is thereby inhibited.
A still further embodiment of the invention is a method to identify candidate drugs for treating tumors. Cells which express one or more TEM genes selected from the group consisting of: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 40, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 221 & 222, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 256, 258, 260, 262, 266, 268, 270, 272, and 274, respectively, are contacted with a test compound. Expression of said one or more TEM genes is determined by hybridization of mRNA of said cells to a nucleic acid probe which is complementary to said mRNA. A test compound is identified as a candidate drug for treating tumors if it decreases expression of said one or more TEM genes. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more TEMs. Test compounds which increase expression can be identified as candidates for promoting wound healing.
Yet another embodiment of the invention is a method to identify candidate drugs for treating tumors. Cells which express one or more TEM proteins selected from the group consisting of: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 40, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275, respectively, are contacted with a test compound. The amount of said one or more TEM proteins in said cells is determined. A test compound is identified as a candidate drug for treating tumors if it decreases the amount of one or more TEM proteins in said cells. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more TEMs. Alternatively, a test compound which increases the amount of one or more TEM proteins in said cells is identified as a candidate drug for treating wound healing.
According to another aspect of the invention a method is provided to identify candidate drugs for treating tumors. Cells which express one or more TEM proteins selected from the group consisting of: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 40, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275, respectively, are contacted with a test compound. Activity of said one or more TEM proteins in said cells is determined. A test compound is identified as a candidate drug for treating tumors if it decreases the activity of one more TEM proteins in said cells. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more TEMs. Optionally the cells are endothelial cells. If a test compound increases the activity of one more TEM proteins in said cells it can be identified as a candidate drug for treating wound healing.
An additional aspect of the invention is a method to identify candidate drugs for treating patients bearing tumors. A test compound is contacted with recombinant host cells which are transfected with an expression construct which encodes one or more TEM proteins selected from the group consisting of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 40, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275, respectively. Proliferation of said cells is determined. A test compound which inhibits proliferation of said cells is identified as a candidate drug for treating patients bearing tumors. A test compound which stimulates proliferation of said cells is identified as a candidate drug for promoting neoangiogenesis, such as for use in wound healing.
Another embodiment of the invention provides a method to identify candidate drugs for treating tumors. Cells which express one or more NEM genes selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 278, 282, 284, and 288, respectively, are contacted with a test compound. Expression of said one or more NEM genes is determined by hybridization of mRNA of said cells to a nucleic acid probe which is complementary to said mRNA. A test compound is identified as a candidate drug for treating tumors if it increases expression of said one or more NEM genes. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more NEMs.
According to another aspect of the invention a method is provided to identify candidate drugs for treating tumors. Cells which express one or more NEM proteins selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289, are contacted with a test compound. The amount of said one or more NEM proteins in said cells is determined. A test compound is identified as a candidate drug for treating tumors if it increases the amount of one more NEM proteins in said cells. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more NEMs.
An additional aspect of the invention is a method to identify candidate drugs for treating tumors. Cells which express one or more NEM proteins selected from the group consisting of: 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289, are contacted with a test compound. Activity of said one or more NEM proteins in said cells is determined. A test compound is identified as a candidate drug for treating tumors if it increases the activity of said one or more NEM proteins in said cells. Optionally the cells are endothelial cells. Alternatively or additionally, the cells are recombinant host cells which are transfected with an expression construct which encodes said one or more NEMs.
Still another embodiment of the invention provides a method to identify candidate drugs for treating patients bearing tumors. A test compound is contacted with recombinant host cells which are transfected with an expression construct which encodes one or more NEM proteins selected from the group consisting of 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289. Proliferation of said cells is determined. A test compound which stimulates proliferation of said cells is identified as a candidate drug for treating patients bearing tumors.
Another aspect of the invention is a method for identifying endothelial cells. One or more antibodies which bind specifically to a TEM or NEM protein selected from the group consisting of TEM: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 30, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275 and NEM 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289, is contacted with a population of cells. Cells in the population which have bound to said antibodies are detected. Cells which are bound to said antibodies are identified as endothelial cells. Optionally cells which have bound to said antibodies are isolated from cells which have not bound.
Still another aspect of the invention is a method for identifying endothelial cells. One or more nucleic acid hybridization probes which are complementary to a TEM or NEM gene nucleic acid sequence selected from the group consisting of TEM: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 19, 20, 21, 22, 24, 25, 27, 28, 29, 30, 31, 33, 35, 36, 37, 38, 39, 41, 42, 44, 45, and 46 as shown in SEQ ID NO: 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 223 & 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254, 358, 257, 259, 261, 263, 267, 269, 271, 273, and 275 and NEM 14, 22, 23, and 33 as shown in SEQ ID NO: 279, 283, 285, 286, 287, and 289, is contacted with nucleic acids of a population of cells. Nucleic acids which have specifically hybridized to said nucleic acid hybridization probes are detected. Cells whose nucleic acids specifically hybridized are identified as endothelial cells.
Yet another embodiment of the invention is a method of inhibiting neoangiogenesis. An effective amount of an isolated molecule comprising an antibody variable region which specifically binds to an extracellular domain of a mouse TEM protein selected from the group consisting of: 1, 2, 3, 9, 17, and 19, as shown in SEQ ID NO: 291, 293, 299, 295, 297, and 301, respectively, is administered to a subject in need thereof. Neoangiogenesis is thereby inhibited. The subject may be a mouse, may bear a vascularized tumor, may have polycystic kidney disease, may have diabetic retinopathy may have rheumatoid arthritis, or may have psoriasis, for example.
These and other embodiments which will be apparent to those of skill in the art upon reading the specification provide the art with reagents and methods for detection, diagnosis, therapy, and drug screening pertaining to neoangiogenesis and pathological processes involving or requiring neoangiogenesis.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A-1B. vWF expression in colorectal cancers. vWF (red stain) was detected in vessels by in situ hybridization. At low power magnification (FIG. 1.A) vessels were often surrounded by a perivascular cuff of viable cells (red arrows), with a ring of necrotic cells evident at the periphery (black arrows). At high power magnification (FIG. 1.B) the expression of vWF (red) was clearly localized to the vessels. Sections were counterstained with methyl green.
FIG. 2A-2D. Purification of Endothelial Cells (ECs) from human normal and malignant tissue. (FIG. 2A) Vessels (red) of frozen sections were stained by immunofluorescence with the P1H12 monoclonal antibody (Chemicon, Temecula, Calif.) and detected using a biotinylated goat anti-mouse IgG secondary antibody followed by rhodamine-linked strepavidin. The region stained is from within the lamina propria of normal colonic mucosa. Note that the larger vessels (arrowheads) and capillaries (arrows) are positive, and staining of hematopoietic cells was undetectable. E-cadherin positive epithelial cells (green) at the edge of the crypt were simultaneously visualized using a rabbit polyclonal antibody (Santa Cruz, Santa Cruz, Calif.), followed by a goat anti-rabbit IgG secondary antibody labelled with alexa (Molecular Probes, Eugene, Oreg.). Sections were imaged at 60× magnification using confocal microscopy. (FIG. 2.B) To isolate pure populations from collagenase dispersed tissues, the epithelial and hematopoietic cell fractions were sequentially removed by negative selection with magnetic beads. The remaining cells were stained with P1H12 and ECs were isolated by positive selection with magnetic beads. (FIG. 2.C) RT-PCR analysis used to assess the purity of the EC preparations. Semiquantitative PCR analysis was performed on cDNA generated either directly from colorectal cancer tissue (unfractionated tumor) or from purified ECs isolated from normal colonic mucosa (normal EC fraction) or colorectal cancer (tumor EC fraction). PCR amplification of the epithelial specific marker cytokeratin 20 (CK20), demonstrated its expression was limited to the unfractionated tumor. Two endothelial specific markers, vWF and VE-cadherin (VE-Cad) showed robust amplification only in the endothelial fractions, validating the purity and enrichment protocol shown in (FIG. 2.B). The ubiquitous housekeeping enzyme GAPDH was observed in all samples. No signal was detected in the no-template (NT) control. cDNA templates were diluted 1:10, 1:100, 1:1000, 1:4000, and 1:40,000 as indicated by the declining wedge. (FIG. 2.D) The relative expression level of select genes was determined by measuring the tag abundance from several SAGE libraries combined into four groups. The first was composed of  ̃193,000 tags from the two in vivo-derived EC preparations (Endothelial Cell Fraction) while the second contained a single library of  ̃57,000 tags containing macrophages and other leukocytes derived from the negative selection (Hematopoietic Fraction). The fourth library contained  ̃401,000 tags from cultured HUVEC and HMVEC (Endothelial Cells in Culture), and the fourth consisted of  ̃748,000 tags from 6 colon cancer cell lines in culture (Epithelial Cells). After normalization, the library with the highest tag number for each marker was given a value of 100%, and the corresponding relative expression levels of the remaining 3 libraries was plotted on the ordinate. Note the high level of CD31 present on hematopoietic cells, the likely cause of the impurity of the initial endothelial selection, compared with the selectivity of P1H12.
FIG. 3A-3E). Expression of Pan-Endothelial Markers (PEMs) is limited to ECs. The endothelial origin of PEMs identified by SAGE was confirmed using a highly sensitive in situ hybridization assay. Localization of novel PEMs to the ECs was demonstrated by examining two representative PEMs, PEM3 (FIG. 3A) and PEM6 (FIG. 3B) in lung cancer and colon cancer, respectively. Hevin expression was readily detected in the ECs of a colon tumor (FIG. 3C) despite its low level of expression in cultured ECs. Expression of VEGFR2 was readily detectable in the ECs of both normal (FIG. 3D) and malignant colon tissue (FIG. 3E).
FIG. 4A-4J. Expression of Tumor Endothelial Markers (TEMs). (FIG. 4A) RT-PCR analysis confirmed the tumor specific expression of selected novel TEMs. Semiquantitative PCR analysis was performed on cDNA generated either from purified epithelial cells as a negative control (Control) or from purified ECs isolated from normal colonic mucosa (Normal ECs) or colorectal cancer (Tumor ECs) from two different patients. Two endothelial specific markers, vWF and PEM6 showed robust amplification only in the endothelial fractions whereas the ubiquitous housekeeping enzyme GAPDH was observed in all samples. TEM1 (BSC-TEM1), TEM 17 (BSC-TEM7) and TEM22 (BSC-TEM9) were specifically expressed in tumor compared to normal ECs. The cDNA template was diluted 1:10, 1:100, 1:1000, and 1:10,000 as indicated by the declining wedge. (FIG. 4B-4J) The endothelial origin of TEMs identified by SAGE was confirmed using in situ hybridization as in FIG. 3. Expression of TEM 1 (BSC-TEM1) (FIG. 4B) and TEM17 (BSC-TEM7). (FIG. 4C) was demonstrated to be highly specific to the ECs in colorectal cancers; sections were imaged in the absence of a counterstain to show the complete lack of detectable expression in the non-endothelial cells of the tumor. Expression of TEM17 (BSC-TEM7) in ECs was demonstrated in a metastatic liver lesion from a primary colorectal cancer (FIG. 4D), a lung (FIG. 4E), breast (FIG. 4F), pancreatic (FIG. 4G) and brain cancer (FIG. 4H), as well as in a sarcoma (FIG. 41). TEM 17 (BSC-TEM7) was also localized to vessels during normal physiological angiogenesis of the corpus luteum (FIG. 4J).



DETAILED DESCRIPTION OF THE INVENTION
We identified 46 human genes that were expressed at significantly higher levels (>10-fold) in tumor endothelium than in normal endothelium, and 33 genes that were expressed at significantly lower levels in human tumor versus normal endothelium. See Tables 2 and 4, respectively. Most of these genes were either not expressed or expressed at relatively low levels in Endothelial Cells (ECs) maintained in culture. Moreover, we identified 93 genes which are expressed in both normal and tumor human endothelium. Interestingly, the tumor endothelium genes were expressed in all tumors tested, regardless of its tissue or organ source. Most tumor endothelium genes were also expressed in corpus luteum and wounds.
As the work has progressed, we have refined and classified our original 46 tumor endothelial markers. We have named these markers TEMs and renumbered them consecutively by the prevalence of their tags in our SAGE analysis. Originally we had not used a consecutive numbering system. Our non-consecutive numbering system has been renamed as BSC-TEMs. For most of the original 46 SAGE Tags, we now provide full-length nucleic acid and protein sequence. In some cases, the sequences were obtained through the public databases, in others the sequences were obtained by cloning and through the use of gene prediction tools. In some cases, we found SAGE Tags corresponding to genes having different splice varients or with known polymorphisms. For example, in one case the SAGE Tag BSC-TEM3 has been found to hybridize to an alternatively spliced form of the transcript encoding BSC-TEM7. The proteins encoded by the two transcripts are the same; therefore they are cumulatively called TEM7. A highly related sequence was found via homology searches, BSC-TEM7R. This paralog sequence is now called TEM3. See Table 2, which follows, showing tumor endothelial markers by order of prevalence (except for TEM 3). Column 1 indicates the prevalence number. Column 2 indicates the original nomenclature. Column 3 indicates the short tags. Column 4 indicates the long tags. Column 5 indicates the accession number in GenBank. Column 6 indicates the sequence identifiers for the short tag, the long tag, the full nucleic acid, and the protein. Column 7 provides a functional description, which is expanded below in the text.














TEM
BSC-
GGGGCTGCC
GGGGCTGCCCAGCT
NM020404
SEQ ID
tumor endothelial marker 1 precursor



1
TEM1
CA
GA

NO: 94,







309, 195,







196


 


TEM
BSC-
GATCTCCGT


SEQ ID
sapiens tumor endothelial marker 2


2
TEM2
GT


NO: 95,
(BSC-TEM2) mRNA/mouse Ras, dexa-







197, 198
methasone-induced 1








(RASD1), mRNA


 


TEM
BSC-



SEQ ID
human ortholog of mouse paralog of


3
TEM7



N0: 199,
mouse TEM-7



R



200


 


TEM

CTTTCTTTGA
CTTTCTTTGAGTTTT
AB034203
SEQ ID
Homo sapiens dickkopf-3 (DKK-3)


4

G
AA

NO: 97,
mRNA,







311, 201,







202


 


TEM
BSC-
TATTAACTCT
TATTAACTCTCTTTG

SEQ ID
Tumor endothelial marker 4


5
TEM4
C
GA

N0: 98,







312, 203,







204


 


TEM

CAGGAGACC
CAGGAGACCCCAGG
X57766
SEQ ID
Human stromelysin-3 mRNA.


6

CC
CCC

NO: 99,







314, 205,







206


 


TEM

GGAAATGTC
GGAAATGTCAGCAA
BC002576
SEQ ID
matrix metalloproteinase 2


7

AA
GTA

NO: 100,
(gelatinase A, 72kD gelatinase, 72kD







315, 207,
type IV collagenase)







208


 


TEM

CCTGGTTCA


SEQ ID
HeyL transcription factor


8

GT


NO: 101,







316, 209,







210


 


TEM
BSC-
TTTTTAAGAA
TTTTTAAGAACTCGG

SEQ ID


9
TEM5
C
GT

NO: 102,







317, 211,







212


 


TEM

TTTGGTTTTC
TTTGGTTTTCCAAAA
J03464,
SEQ ID
Human collagen alpha-2 type I mRNA,


10

C
GA
M18057,
NO: 103,
complete cds, clone pHCOL2A1.






X02488
319, 213,







214


 


TEM

ATTTTGTATG
ATTTTGTATGATTTT
NM_00250
SEQ ID
nidogen/entactin


11

A
TA
8
NO: 104,







321, 215,







216


 


TEM

ACTTTAGATG
ACTTTAGATGGGAA
X52022
SEQ ID
H. sapiens RNA for type VI collagen


12

G
GCC

NO: 105,
alpha3 chain.







322, 217,







218


 


TEM

GAGTGAGAC
GAGTGAGACCCAGG
M11749
SEQ ID
Human Thy-1 glycoprotein gene,


13

CC
AGC

NO: 106,
complete cds.







324, 219,







220


 


TEM

GTACACACA
GTACACACACCCCC

SEQ ID
Cystatin SN


14

CC
ACC

NO: 107,







325, 221,







223


 


TEM

GTACACACA
GTACACACACCCCC
X54667
SEQ ID
H.sapiens mRNA for cystatin S.


14

CC
ACC

NO: 107,







325, 222







224


 


TEM

CCACAGGGG
CCACAGGGGATTCT
NM_00009
SEQ ID
Human mRNA 3′ region for pro-alpha1


15

AT
CCT
0
NO: 108,
(III) collagen.







327, 225







226


 


TEM
BSC-
TTAAAAGTCA
TTAAAAGTCACTGTG

SEQ ID


16
TEM6
C
CA

NO: 109,







328, 227,







228


 


TEM
BSC-
ACAGACTGTT
ACAGACTGTTAGCC
AF279144
SEQ ID
Human Tumor endothelial marker 7


17
TEM7
A
AAG

NO: 110,







329, 229,







230


 


TEM

CCACTGCAA


SEQ ID


18

CC


NO: 111


 


TEM
BSC-
CTATAGGAG


SEQ ID


19
TEM8
AC


NO: 112,







330, 231,







232


 


TEM

GTTCCACAG

NM_00008
SEQ ID
collagen, type I, alpha 2 (COL1A2


20

AA

9
NO: 113,







233, 234


 


TEM

TACCACCTC
TACCACCTCCCTTTC

SEQ ID
Homo sapiens mRNA; cDNA DKFZp762B245


21

CC
CT

NO: 114,
(from clone DKFZp762B245);







331, 235,







236


 


TEM
BSC-
GCCCTTTCTC
GCCCTTTCTCTGTA
NM_00603
SEQ ID
endocytic receptor (macrophage


22
TEM9
T
GTT
9
NO: 115,
mannose receptor family) (KIAA0709),







334, 237,







238


 


TEM

TTAAATAGCA
TTAAATAGCACCTTT

SEQ ID
no match


23

C
AG

NO: 116,







335


 


TEM

AGACATACT
AGACATACTGACAG
NM_02264
SEQ ID
Homo sapiens mRNA; cDNA DKFZp434G162


24

GA
AAT
8
NO: 117,
(from clone DKFZp434G162);







336, 239,







240


 


TEM

TCCCCCAGG
TCCCCCAGGAGCCA
L35279,
SEQ ID
Homo sapiens (clone kT2) bone


25

AG
CCG
NM_00612
NO: 118,
morphogenetic protein-1 (BMP-1) mRNA






9
338, 241,







242


 


TEM

AGCCCAAAG


SEQ ID
No Match


26

TG


NO: 119


 


TEM

ACTACCATAA

NM_00306
SEQ ID
Homo sapiens mRNA for MEGF5, partial


27

C

2
NO: 120,
cds.







243, 244


 


TEM

TACAAATCGT
TACAAATCGTTGTCA
NM_01485
SEQ ID
Homo sapiens mRNA for KIAA0672


28

T
AA
9
NO: 121,
protein, complete cds.







339, 245,







246


 


TEM

TTGGGTGAA


SEQ ID
ESTs (2 unigene clusters)


29

AA


NO: 122,







247, 248


 


TEM

CATTATCCAA
CATTATCCAAAAACA
THC53402
SEQ ID
integrin, alpha 1


30

A
AT
9,
NO: 123,






X68742,
340, 249,






AI262158,
250






AI88747,






AI394565,






AA679721


 


TEM

AGAAACCAC
AGAAACCACGGAAA
NM_00184
SEQ ID
hypothetical protein KIAA1164


31

GG
TGG
5
NO: 124,







341, 251







252


 


TEM

ACCAAAACC


SEQ ID
no match


32

AC


NO: 125


 


TEM

TGAAATAAAC

NM_00025
SEQ ID
methylmalonyl Coenzyme A mutase


33



5
NO: 126,







253, 254


 


TEM

TTTGGTTTCC


SEQ ID
no match


34




NO: 127


 


TEM

GTGGAGACG
GTGGAGACGGACTC
ESTAI186
SEQ ID
est


35

GA
TGT
535
N0: 128







345, 255,







358


 


TEM

TTTGTGTTGT
TTTGTGTTGTATATT
NM_00437
SEQ ID
est


36

A
TA
0
NO: 129,







346, 256,







257


 


TEM

TTATGTTTAA
TTATGTTTAATAGTT
NM_00234
SEQ ID
Human lumican mRNA, complete cds.


37

T
GA
5
NO: 130,







347, 258,







259


 


TEM

TGGAAATGA
TGGAAATGACCCAA
NM_00008
SEQ ID
collagen type1 alpha1


38

C
AAA
8
NO: 131,







348, 260,







261


 


TEM

TGCCACACA
TGCCACACAGTGAC
NM_00323
SEQ ID
Human transforming growth factor-


39

GT
TTG
9
NO: 132,
beta 3 (TGF-beta3) mRNA, complete







350, 262,







263


 


TEM

GATGAGGAG
GATGAGGAGACTGG

SEQ ID
collagen, type I, alpha 2


40

AC
CAA

NO: 133,







351, 264,







265


 


TEM

ATCAAAGGTT
ATCAAAGGTTTGATT

SEQ ID
est


41

T
TA

N0: 134,







352, 266,







267


 


TEM

AGTCACTAGT
AGTCACATAGTACAT
NM_02522
SEQ ID
ESTs


42


AA
6
NO: 135,







353, 268,







269


 


TEM

TTCGGTTGG
TTCGGTTGGTCAAA

SEQ ID
No match


43

TC
GAT

NO: 136,







354


 


TEM

CCCCACACG
CCCCACACGGGCAA
NM_01835
SEQ ID
Homo sapiens cDNA FLJ11190 fis,


44

GG
GCA
4v
NO: 137,
clone PLACE1007583.







355, 270,







271


 


TEM

GGCTTGCCT
GGCTTGCCTTTTTGT
NM_00036
SEQ ID
est


45

TT
AT
6
NO: 138,







356, 272,







273


 


TEM

ATCCCTTCCC
ATCCCTTCCCGCCA
NM_00268
SEQ ID
Homo sapiens mRNA for peanut-like


46

G
CAC
8
NO: 139,
protein 1, PNUTL1 (hCDCrel-1).







357, 274,







275






The studies described below provide the first definitive molecular characterization of ECs in an unbiased and general manner. They lead to several important conclusions that have direct bearing on long-standing hypotheses about angiogenesis. First, it is clear that normal and tumor endothelium are highly related, sharing many endothelial cell specific markers. Second, it is equally clear that the endothelium derived from tumors is qualitatively different from that derived from normal tissues of the same type and is also different from primary endothelial cultures. Third, these genes are characteristically expressed in tumors derived from several different tissue types, documenting that tumor endothelium, in general, is different from normal endothelium. Fourth, the genes expressed differentially in tumor endothelium are also expressed during other angiogenic processes such as corpus luteum formation and wound healing. It is therefore more appropriate to regard the formation of new vessels in tumors as “neoangiogenesis” rather than “tumor angiogenesis” per se. This distinction is important from a variety of perspectives, and is consistent with the idea that tumors recruit vasculature using much of, or basically the same signals elaborated during other physiologic or pathological processes. That tumors represent “unhealed wounds” is one of the oldest ideas in cancer biology.
The nature and precise biological function of many of the Tumor Endothelial Markers (TEMs) identified here are unknown. Of the previously characterized genes shown in Table 2, it is intriguing that several encode proteins involved in extracellular matrix formation or remodelling (TEM 6, TEM 6, TEM 10, TEM 7, TEM 11, TEM 12, TEM 14, TEM 20, TEM 24, TEM 25, TEM 27, TEM 37, TEM 38, and TEM 40,) Deposition of extracellular matrix is likely critical to the growth of new vessels. Finally, it is perhaps not surprising that so many of the endothelial-specific transcripts identified here, whether expressed only in neovasculature or in endothelium in general, have not been previously characterized, and some are not even represented in EST databases. In part, this may be due to the fact that the EST databases are heavily biased toward certain tissues, but moreover, may be due to the fact that even in highly vascularized tissues endothelial cells are still a relatively small proportion of the population. Thus, the sensitivity of the SAGE method is a particularly appropriate tool.
Sequence and literature study has permitted the following identifications to be made among the family of TEM proteins. TEM proteins have been identified which contain transmembrane regions. These include TEM 1, TEM 3, TEM 9, TEM 13, TEM 17, TEM 19, TEM 22, TEM 30, and TEM 44. TEM proteins have been identified which are secreted proteins, including TEM 4, TEM 6, TEM 7, TEM 10, TEM 12, TEM 14, TEM 20, TEM 25, TEM 27, TEM 31, TEM 36, TEM 37, TEM 38, and TEM 39. HeyL (TEM 8) is a transcription factor which may be involved in regulating TEMs as one or more groups. The protein corresponding to the tag for TEM44 was found in the public databases, but no biological function has yet been ascribed to it.
TEM 1 has been named endosialin in the literature. It has a signal sequence at amino acids 1-17 and a transmembrane domain at amino acids 686-708. Thus it is a cell surface protein. Its extracellular domain is at resiudes 1-685. Endosialin may be involved in endocytosis. The mouse ortholog is predicted to have a signal peptide at residues 1-21.
TEM 2 is a dexamethasone induced, as related protein homolog of 266 amino acids. It has neither a signal sequence nor a transmembrane domain. Thus it is neither a cell surface nor a secreted protein. TEM 2 plays a role in signal transduction. It regulates alterations in cell morphology, proliferation, and cell-extracellular matrix interactions.
TEM 3 (originally termed TEM 7R) has both a signal sequence (at residues 1-24 or 1-30) and a transmembrane domain (at residues 456-477). Thus it is a cell surface protein. The portion of the protein which is extracelular is at amino acids 1-455. TEM 3 has domains with homology to integrins, plexin, and adhesion molecules. TEM 3 may regulate GTPases that control signal transduction pathways linking plasma membrane receptors to the actin cytoskeleton. In the mouse ortholog, the signal peptide is predicted to be residues 1-30.
TEM 4 is also known as DKK-3. It has a signal sequence (residues1-16), suggesting that is a secreted protein. TEM 4 regulates wnt signaling, and it may be involved in vasculogenesis and wnt-dependent signaling for endothelial growth. TEM 4 is an inhibitor of Wnt oncogene and such inhibition can be determined by assay. Tsuji et al., Biochem. Biophys. Res. Comm. 268: 20-4, 2000.
TEM 5 appears to be neither secreted nor a cell surface protein. TEM 5 appears to be a component of a G protein—GTPase signaling pathway.
TEM 6 is also known as stromelysin-3/Matrix metalloproteinase 11 (MMP-11). It has a signal sequence at residues 1-31, but no transmembrane domain. It has an alternative signal peptide splice site at residues 108-109. Thus it appears to be a secreted protein. TEM 6 belongs to the zinc metaloprotease family, also known as the matrixin subfamily. TEM 6 is expressed in most invasive carcinomas. Alpha 1—protease inhibitor is a natural substrate of MMP 11. TEM 6 degrades extracellular matrix proteins such as collagen and is involved in extracellular matrix remodeling and cell migration. Stromelysin can be assayed using a casein-resorufin substrate, for example. See Tortorella and Arner, Inflammation Research 46 Supp. 2: S122-3, 1997.
TEM 7 is a protein of many names, also being known as matrix metalloproeinase 2, gelatinase A, and 72 KD type IV collagenase. TEM 7 has a signal sequence at residues 1-26 and is a secreted protein. Like TEM 6, TEM 7 belongs to the matrixin subfamily (zinc metalloproteinases). TEM 7 cleaves gelatin type I, collagen type I, IV, V VII and X. TEM 7 associates with integrin on the surface of endothelial cells and promotes vascular invasion. TEM 7 is involved in tissue remodeling. TEM 7 can be assayed using zymography or quenched fluorescent substrate hydrolysis, for example. Garbett, et al., Molecular Pathology 53: 99-106, 2000. A fluorogenic matrix metalloproteinase substrae assay can also be used which employs methoxycoumarin containing septapeptide analog of the alpha2(I) collagen cleavage site. See Bhide et al., J. Periodontology 71:690-700, 2000.
TEM 8 is HEYL protein. It has neither a signal sequence nor a transmembrane domain. It is related to the hairy/Enhancer of split genes. TEM 8 is likely a nuclear protein, having a role as a transcription factor. TEM 8 belongs to a new class of Notch signal tranducers and plays a key role in various developmental processes, such as vascular development, somatogenesis and neurogenesis. SNP's at residues 615 and 2201 have Cytosine bases. Notch 3 mutations underlie the CADASIL vascular disorder. See Mech Dev 2000 November; 98 (1-2):175.
TEM 9 is a G-protein coupled receptor homolog, having both a signal sequence at residues 1-26 and 7 transmembrane domains. Thus it is a cell surface protein. Its extracellular region resides in amino acids 1-769. Its transmembrane domains are at residues 817-829 (TM2 and TM3), residues 899-929 (TM4 and TM5), and residues 1034-1040 (TM6 and TM7). TEM 9 acts as a G-protein coupled receptor with extracellular domains characteristic of cell adhesion proteins. One of its splice variants may function as a soluble receptor. TEM 9 may regulate cell polarity and cell migration. It may be involved in exocytosis based on latrophilin function. The mouse ortholog has a predicted signal peptide at residues 1-29.
TEM 10 is collagen type I, alpha2 (COL1A2), which has a signal sequence at residues 1-22. It is an extracellular matrix (ECM) protein which is secreted subsequent to synthesis. TEM 10 interacts with a number of proteins including other ECM proteins, certain growth factors, and matrix metalloproteases. TEM 10 is required for the induction of endothelial tube formation and is involved in tissue remodeling. A variant at nucleotide 3233 which substitutes an A, is associated with osteogenesis imperfecta type IV. A variant at nucleotide 4321 substituting an A retains a wild type phenotype. Nucleotide 715 is a site of a polymorphism. Nucleotides 695-748 are deleted in Ehlers-Danos syndrome. Other mutations are associated with idiopathic osteoporosis, and atypical Marfan syndrome. Variants are known at nucleotides 226(T,C), 314(A,C), 385(T,C), 868 (G,A), 907(C,T), 965(A,G), 970(T,A), 1784 (G,C), 2017(T,G), 2172(C,A), 2284(T,C), 2308(T,C), 2323(T,G), 2344(T,G), 2604(G,A), 2974(A,T), 2903(A,G), 2995(C,T), 3274(C,T), 3581(A,C), 3991(A,C), 4201(G,T), 4434(C,T), 4551(A,C), 4606(C,A), 4947(T,C), 4978(C,T), 4982(G,T), 5051(G,T). PolyA sites are located at nucleotides 4450, 4550, 4885, and 5082. PolyA signals are located at 4420-4424, 4515-4520, 4529-4534, 4866-4871, 5032-5037, 5053-5058. TEM 10, 20, and 40 derive from the same gene but are different isoforms having different lengths.
TEM 11 is Nidogen/Entactin. It is a secreted protein which has a signal sequence at residues 1-28. TEM 11 is an extracellular matrix protein which is a component of a basement membrane. TEM 11 binds to laminin and collagen IV and other extracellular matrix proteins. TEM 11 regulates capillary formation and is involved in tissue remodelling. Variations have been observed at nucleotides 4265(T,C), 4267(G,C,T), and 4738(T,G). Nidogen can be assayed by its effect on the morphology of astrocytes. See Grimpe et al., GLIA 28:138-49, 1999.
TEM 12 is the alpha 3 chain of collagen type VI. It has a signal sequence at residues 1-25. A secreted protein, TEM 12 is an extrallcellular matrix protein. TEM 12 has a splice variant. TEM 12 is a major constituent of vascular subendothelium and is involved in tissue remodeling. It regulates platelet activation and aggregation. Alternatively spliced domains are located at nucleotides 347-964, 965-1567, 2153-3752, and 4541-5041.
TEM 13 is also known as Thy-1 glycoprotein. It has both a signal sequence (at residues 1-19) and a transmembrane domain (at residues 143-159). Residues 131-161 are removed in a matured form of the protein. The extracellular region of the protein is resudes 1-142 or residues 1-130. TEM 13 has a glycosyl phosphatidylinositol (GPI) anchor at residue 130 anchoring it to the membrane. TEM 13 is detectale in its soluble form in human serum. TEM 13 is reported to be a marker for activated endothelial cells (a marker of adult but not embryonic angiogenesis). TEM 13 on vascular endothelial cells may function as a possible vascular permeability modulator. Antibody to Thy-1 is a mitogenic signal for the CD4+CD45+ and CD8+CD45+ cells, but fails to induce proliferation in the CD45− T cells. Pingel et al., International Immunology 6:169-78, 1994. Thy-1 can be assayed as an inhibitor of such signal.
TEM 14 is also known as cystatin S. It is a secreted protein with a signal sequence at residues 1-20 and an extracellular region at residues 1-141. It is a cysteine protease inhibitor. TEM 14 may regulate cysteine protease function involved in angiogenesis and tissue remodeling. TEM14 is an inhibitor of the activity of papain and such inhibition can be assayed. Hiltke et al., J. Dental Research 78:1401-9, 1999.
TEM 15 is collagen type III, alpha 1 (COL3A1). It has a signal sequence (residues 1-23) and is secreted. Type III collagen binds to von Willebrand factor. It is involved in cell-cell adhesion, proliferation, and migration activities. Variants at nucloetides 2104(C,A), 2194(G,A), 2346(C,T), 2740(C,T), 3157(T), 3468(G), 3652(T), 3666(C), 3693(C), 3755(G), 3756(T), 3824(C), 4546(A, G), 4661(G), 4591(C,T), 4665(C), 5292(C), 5293(C), and 5451(A) have been observed.
TEM 16 is a tensin homolog which is apparently an intracellular protein. It may have splice variants or isoforms. One form with 1704 amino acids has a region at the N-terminal domain which is similar to a tumor suppressor protein, phosphatase and tensin homolog (PTEN). Tensin is a focal adhesion molecule that binds to actins and phosphorylated proteins. It is involved in cell migration linking signal tranduction pathways to the cytoskeleton. PTEN regulates tumor induced angiogenesis.
TEM 17 (BSC-TEM 7) has a signal sequence which includes residues 1-18 and a transmembrane domain at residues 427-445. It is a cell surface marker with an extracellular region comprising residues 1-426. It has homologs in both mouse and C. elegans. Residues 137-244 share weak homology with nidogen; residues 280-344 share homology to PSI domains found in plexin, semaphorins and integrin beta subunits. Variants have been observed at nucleotides 1893(A,G), 1950(C,G), 2042(A,G), and 2220(G,A). In mouse TEM 17 the signal sequence includes residues 1-19.
TEM 19 was originally reported to be tumor endothelial marker 8, i.e., BSC-TEM 8. It has a signal sequence at residues 1-27 and a transmembrane domain at residues 322-343. It is a cell surface protein having an extracellular region at residues 1-321.TEM 19 has a von Willebrand Factor (vWF) A domain at residues 44-216; a domain at residues 34-253 which is found in leukointegrin alpha D chain; and a domain at residues 408-560 found in PRAM-1 or adaptor molecule−1 of the vinculin family. TEM 19's function is adhesion related. vonWillibrand Factor domains are typically involved in a variety of functions including vascular processes. TEM 19 may play a role in the migration of vascular endothelial cells. The mouse ortholog has a predicted signal peptide at residues 1-27.
TEM 20 is collagen type I, alpha 2 (COL1A2). It has a signal sequence at residues 1-22 and is a secreted extracellular matrix protein. TEM 20 induces endothelial tube formation in vitro and is involved in tissue remodeling. Variants have been observed at nucleotides 226(T,C), 314(A,C), 385(T,C), 868 (G,A), 907(C,T), 965(A,G), 970(T,A), 1784(G,C), 2017(T,G), 2172(C,A), 2284(T,C), 2308(T,C), 2323(T,G), 2344(T,G), 2604(G,A), 2794(A,T), 2903(A,G), 2995(C,T), 3274(C,T), 3581(A,C), 3991(A,C), 4201(G,T), 4434(C,T), 4551(A,C), 4606(C,A), 4895-4901(—, GGACAAC), 4947(T,C), 4978(C,T), 4982(G,T), 5051(G,T).
TEM 21 is a Formin-like protein homolog which is an intracellular protein. Formin related proteins interact with Rho family small GTPases, profilin, and other actin associated proteins. Formin-binding proteins bind to FH1 domains with their WW domains. TEM 21 has a proline rich FH 1 domain at residues 221-449. Formin related proteins play crucial roles in morphogenesis, cell polarity, cytokinesis and reorganization of the actin cytoskeleton. They may also regulate apoptosis, cell adhesion and migration.
TEM 22 is an endocytic receptor in the macrophage mannose receptor family. It has both a signal sequence at residues 1-30 and a transmembrane domain at residues 1415-1435, and resides on the cell surface. Its extracellular domain is amino acids 1-1414. TEM 22 may be present as a soluble (secreted) form and act as an inhibitor. It may bind secreted phopholipase A2 (sPLA2) and mediate biological responses elicited by sPLA2. TEM 22 may have endocytic properties for sPLA2 and mediate endocytosis for endothelial related proteins. It may promote cell adhesion and be involved in cell-cell communication. Variations have been observed at nucleotide 5389 (A, G). TEM 22 mediates uptake of micro-organisms and host-derived glycoproteins. Groger et al., J. Immunology 165:5428-34, 2000.
TEM 24 is tensin, an intracellular protein. It is a focal adhesion molecule that binds to actin filaments and interacts with phosphotyrosine containing proteins. It may mediate kinase signaling activities and regulate cellular transformation. Variations have been observed at nucleotides 2502 (A, G), 2622(A, G), 6027(A, G). TEM24 binds to actin filaments and interacts with phosphotyrosine-containing proteins. Chen et al., Biochem. J. 351 Pt2:403-11, 2000. TEM24 also binds to phosphoinositide3-kinase. Auger et al., J. Bio. Chem. 271:23452-7, 1996 TEM 24 also binds to nuclear protein p130. Lo et al., Bioessays 16:817-23, 1994.
TEM 25 is Bone morphogenic protein 1 (BMP-1) which has a signal sequence at residues 1-22. It is a secreted protein. There are at least 6 isoforms of BMP-1 as well as splice variants which add carboxy terminal CUB domains and an additional EGF domain. TEM 25 is a metalloprotease enzyme. It cleaves the C-terminal propeptide of collagen type I, II and III and laminin 5 gamma 2 proteins that are important for vascular processes. It is involved in cartilage formation. Variations have been observed at nucleotides 3106(C,T), 3248(G,A), 3369(G,A). TEM 25 cleave probiglycan at a single site, removing the propeptide and producing a biglycan molecule with an NH(2) terminus identical to that of the mature form found in tissues. Sctt et al., J. Biol. Chem. 275:30504-11, 2000. Laminin alpha 3 and gamma2 short chains are substraates of TEM 25. Amano et al., J. Biol. Chem. 275:22728-35, 2000.
TEM 27 is known as Slit homolog 3, a secreted protein with a signal sequence at residues 1-27. TEM 27 is a secreted guide protein involved in migration, repulsion and patterning. It interacts with “round about” receptors (Robo receptors). TEM 27 may interact with extracellular matrix (ECM) proteins and is involved in cell adhesion. Variations have been observed at nucleotides 4772 (C,T).
TEM 28 is similar to mouse nadrin (neuron specific GTPase activiating protein). TEM 28 is an intracellular protein with a RhoGAP domain. The RhoGAP domain activates RhoA, Rac 1, and Cdc42 GTPases. It is involved in the reorganization of actin filaments and enhancing exocytosis. It may also be involved in cell signalling. Variations have been observed at nucleotide 3969 (A,C),
TEM 29 is protein tyrosine phosphatase type IVA, member 3, isoform 1, an intracellular protein. It has alternate splice variants. TEM 29 belongs to a small class of prenylated protein tyrosine phosphatases (PTPs). It may be membrane associated by prenylation. PTPs are cell signaling molecules and play regulatory roles in a variety of cellular processes and promote cell proliferation. PTP PRL-3 regulates angiotensin—II induced signaling events.
TEM 30 is integrin alpha 1, a cell surface protein having both a signal sequence (residues 1-28) and a transmembrane domain (residues 1142-1164). Its extracellular region includes amino acids 1-1141. TEM 30 is a receptor for laminin and collagen. It mediates a variety of adhesive interactions. TEM 30 is abundantly expressed on microvascular endothelial cells. It stimulates endothelial cell proliferation and vascularization. TEM 30 may regulate angiostatin production. Variations have been observed at nucleotide 418 (C,T). TEM 30 activates the Ras/Shc/mitogen-activated protein kinase pathway promoting fibroblast cell proliferation. It also acts to inhibit collagen and metalloproteinase synthesis. Pozzi et al., Proc. Nat. Acad. Sci. USA 97:2202-7, 2000,
TEM 31 is Collagen IV alpha 1 (COL4A1) a secreted protein with a at residues 1-27. TEM 31 is a component of the basement membrane. It binds to alpha3 beta lintegrin and promotes integrin mediated cell adhesion. Non-collagenous domains of type IV subunits are involved in tumoral angiogenesis. TEM 31 is involved in tissue remodeling. Variations have been observed at nucleotide 4470 (C,T).
TEM 33 is methylmalonyl Co-A Mutase a protein which is localized in the mitochondrial matrix. It degrades several amino acids, odd-numbered-acid fatty acids, and cholesterol to the tricarboylic acid cycle. A defect in TEM 33 causes a fatal disorder in organic acid metabolism termed methylmalonic acidurea. Variations have been observed at nucleotides 1531(G,A), 1671(G,A), 2028(T,C), 2087(G,A), 2359(A,G), 2437(C,A), 2643(G,C), 2702(G,C). TEM 33 converts L-methylmalonyl CoA to succinyl CoA. This reaction can be assayed as is known in the art. See, e.g., Clin. Chem. 41(8 Pt I):1164-70, 1995.
TEM 36 is collagen type XII, alpha1 (COL12A1), an extracellular matrix protein having a signal sequence at residues 1-23 or 24. TEM 36 has von Willebrand Factor (vWF) type A domains, Fibronectin type III domains, and thrombospondin N-terminal like domain. TEM 36 is expressed in response to stress environment. TEM 36 may organize extracellular matrix architecture and be involved in matrix remodeling. There are two isoforms of the protein, a long form and a short form. The short form is missing amino acids 25-1188, and therefore nucleotides 73 to 3564. Both forms share the signal sequence and are therefore both secreted.
TEM 37 is lumican, an extracellular matrix sulfated proteoglycan having a signal sequence at residues 1-18. Lumican interacts with proteins that are involved in matrix assembly such as collagen type I and type VI; it is involved in cell proliferation and tissue morphogenesis. Lumican plays an important role in the regulation of collagen fiber assembly. Variations have been observed at nucleotides 1021(G,T), 1035(A,G), 1209(A,G), 1259(A,C), 1418(C,A), 1519(T,A). TEM 37 is a binding partner of TGF-β. See FASEB J. 15:559-61, 2000. One assay that can be used to determine TEM 37 activity is a collagen fibril formation/sedimentation assay. Svensson et al., FEBS Letters 470:178-82, 2000.
TEM 38 is collagen type I, alpha 1 (COL1A1), an extracellular matrix protein having a signal sequence at residues 1-22. Type I collagen promotes endothelial cell migration and vascularization and induces tube formation and is involved in tissue remodelling. Telopeptide derivative is used as a marker for malignancy and invasion for certain cancer types. Variations have been observed at nucleotides 296(T,G), 1810(G,A), 1890(G,A), 2204(T,A), 3175(G,C), 3578(C,T), 4298(C,T), 4394(A,T), 4410(A,C), 4415(C.A), 4419 (A,T), 4528(C,A), 4572(G,T), 4602(T,C), 5529(T,C), 5670(C,T), 5985(C,T), 6012(C,T).
TEM 39 is transforming growth factor β-3 (TGF-beta3). It has a signal sequence at residues 1-23. It is a secreted protein. TEM 39 regulates cell growth and differentiation. TGF-beta isoforms play a major role in vascular repair processes and remodeling. Variations have been observed at nucleotide 2020(G,T).
TEM 41 is similar to Olfactomedin like protein. It appears to be an intracellular protein, having no obvious predicted signal sequence. Olfactomedin is the major glycoprotein of the extracellular mucous matrix of olfactory neuroepithelium. TEM 41 shares homology with latrophilin (extracellular regions) which has cell-adhesive type domains. TEM 41 may be involved in adhesive function.
TEM 42 is MSTP032 protein, a cell surface protein having a trasmembrane domain at residues 42-61. Its function is unknown and it shares little homology with other proteins. Variations have been observed at nucleotides 418(A,T), 724(C,A).
TEM 44 is a hypothetical protein FLJ1190 (NM—018354) which has two predicted transmembrane domains at residues 121-143 and 176-197. Residues 144-175 may form an extracellular region. TEM 44's function is not known and shares no homology to other known proteins.
TEM 45 is tropomyosin 1 (alpha), a protein which is intracellular. It forms dimers with a beta subunit. It influences actin function. TEM 45 may be involved in endothelial cell cytoskeletal rearrangement. Variations have been observed at nucleotides 509(A,C), 621(A,C), 635(T,G), 642(C,G), 1059(G,T).
TEM 46 is peanut-like 1 protein/septin 5, which belongs to the septin family. Proteins in the septin family bind to GTP and phosphatidylinositol 4,5-bisphosphate. They are involved in the signal tranduction cascades controlling cytokinesis and cell division.
NEM 4 is a member of the small inducible cytokine subfamily A (cys-cys), member 14 (SCYA14). NEM4 is a secreted protein characterized by two adjacent cysteine residues. One isoform lacks internal 16 amino acids compared to isoform 2.
NEM 22 shares homology with guanylate kinase-interacting protein 1Maguin-1. It is a membrane associated protein.
NEM 23 is human signaling lymphocytic acitavation molecule (SLAM). It has a signal sequence at residues 1-20. The extracellular domain may reside at residues 21-237. There is a secreted isoform of the protein.
NEM33 is netrin 4. It induces neurite outgrowth and promotes vascular development. At higher concentration, neurite outgrowth is inhibited.
ECs represent only aminor fraction of the total cells within normal or tumor tissues, and only those EC transcripts expressed at the highest levels would be expected to be represented in libraries constructed from unfractionated tissues. The genes described in the current study should therefore provide a valuable resource for basic and clinical studies of human angiogenesis in the future. Genes which have been identified as tumor endothelial markers (TEMs) correspond to tags shown in SEQ ID NOS: 94-139, 173-176, 180-186. Genes which have been identified as normal endothelial markers (NEMs) correspond to tags shown in SEQ ID NOS: 140-172. Genes which have been identified as pan-endothelial markers (PEMs) i.e., expressed in both tumor and normal endothelial cells correspond to tags shown in SEQ ID NOS: 1-93. Genes which have been previously identified as being expressed predominantly in the endothehum correspond to PEM tags shown in SEQ ID NOS: 1-6, 8, 10-15. Markers in each class can be used interchangeably for some purposes.
Isolated and purified nucleic acids, according to the present invention are those which are not linked to those genes to which they are linked in the human genome. Moreover, they are not present in a mixture such as a library containing a multitude of distinct sequences from distinct genes. They may be, however, linked to other genes such as vector sequences or sequences of other genes to which they are not naturally adjacent. Tags disclosed herein, because of the way that they were made, represent sequences which are 3′ of the 3′ most restriction enzyme recognition site for the tagging enzyme used to generate the SAGE tags. In this case, the tags are 3′ of the most 3′ most NlaIII site in the cDNA molecules corresponding to mRNA. Nucleic acids corresponding to tags may be RNA, cDNA, or genomic DNA, for example. Such corresponding nucleic acids can be determined by comparison to sequence databases to determine sequence identities. Sequence comparisons can be done using any available technique, such as BLAST, available from the National Library of Medicine, National Center for Biotechnology Information. Tags can also be used as hybridization probes to libraries of genomic or cDNA to identify the genes from which they derive. Thus, using sequence comparisons or cloning, or combinations of these methods, one skilled in the art can obtain full-length nucleic acid sequences. Genes corresponding to tags will contain the sequence of the tag at the 3′ end of the coding sequence or of the 3′ untranslated region (UTR), 3′ of the 3′ most recognition site in the cDNA for the restriction endonuclease which was used to make the tags. The nucleic acids may represent either the sense or the anti-sense strand. Nucleic acids and proteins although disclosed herein with sequence particularity, may be derived from a single individual. Allelic variants which occur in the population of humans are including within the scope of such nucleic acids and proteins. Those of skill in the art are well able to identify allelic variants as being the same gene or protein Given a nucleic acid, one of ordinary skill in the art can readily determine an open reading frame present, and consequently the sequence of a polypeptide encoded by the open reading frame and, using techniques well known in the art, express such protein in a suitable host. Proteins comprising such polypeptides can be the naturally occurring proteins, fusion proteins comprising exogenous sequences from other genes from humans or other species, epitope tagged polypeptides, etc. Isolated and purified proteins are not in a cell, and are separated from the normal cellular constituents, such as nucleic acids, lipids, etc. Typically the protein is purified to such an extent that it comprises the predominant species of protein in the composition, such as greater than 50, 60 70, 80, 90, or even 95% of the proteins present.
Using the proteins according to the invention, one of ordinary skill in the art can readily generate antibodies which specifically bind to the proteins. Such antibodies can be monoclonal or polyclonal. They can be chimeric, humanized, or totally human. Any functional fragment or derivative of an antibody can be used including Fab, Fab′, Fab2, Fab′2, and single chain variable regions. So long as the fragment or derivative retains specificity of binding for the endothelial marker protein it can be used. Antibodies can be tested for specificity of binding by comparing binding to appropriate antigen to binding to irrelevant antigen or antigen mixture under a given set of conditions. If the antibody binds to the appropriate antigen at least 2, 5, 7, and preferably 10 times more than to irrelevant antigen or antigen mixture then it is considered to be specific.
Techniques for making such partially to fully human antibodies are known in the art and any such techniques can be used. According to one particularly preferred embodiment, fully human antibody sequences are made in a transgenic mouse which has been engineered to express human heavy and light chain antibody genes. Multiple strains of such transgenic mice have been made which can produce different classes of antibodies. B cells from transgenic mice which are producing a desirable antibody can be fused to make hybridoma cell lines for continuous production of the desired antibody. See for example, Nina D. Russel, Jose R. F. Corvalan, Michael L. Gallo, C. Geoffrey Davis, Liise-Anne Pirofski. Production of Protective Human Antipneumococcal Antibodies by Transgenic Mice with Human Immunoglobulin Loci Infection and Immunity April 2000, p. 1820-1826; Michael L. Gallo, Vladimir E. Ivanov, Aya Jakobovits, and C. Geoffrey Davis. The human immunoglobulin loci introduced into mice: V (D) and J gene segment usage similar to that of adult humans European Journal of Immunology 30: 534-540, 2000; Larry L. Green. Antibody engineering via genetic engineering of the mouse: XenoMouse strains are a vehicle for the facile generation of therapeutic human monoclonal antibodies Journal of Immunological Methods 231 11-23, 1999; Yang X-D, Corvalan J R F, Wang P, Roy CM-N and Davis C G. Fully Human Anti-interleukin-8 Monoclonal Antibodies: Potential Therapeutics for the Treatment of Inflammatory Disease States. Journal of Leukocyte Biology Vol. 66, pp 401-410 (1999); Yang X-D, Jia X-C, Corvalan J R F, Wang P, C G Davis and Jakobovits A. Eradication of Established Tumors by a Fully Human Monoclonal Antibody to the Epidermal Growth Factor Receptor without Concomitant Chemotherapy. Cancer Research Vol. 59, Number 6, pp 1236-1243 (1999); Jakobovits A. Production and selection of antigen-specific fully human monoclonal antibodies from mice engineered with human Ig loci. Advanced Drug Delivery Reviews Vol. 31, pp: 33-42 (1998); Green L and Jakobovits A. Regulation of B cell development by variable gene complexity in mice reconstituted with human immunoglobulin yeast artificial chromosomes. J. Exp. Med. Vol. 188, Number 3, pp: 483-495 (1998); Jakobovits A. The long-awaited magic bullets: therapeutic human monoclonal antibodies from transgenic mice. Exp. Opin. Invest. Drugs Vol. 7(4), pp: 607-614 (1998); Tsuda H, Maynard-Currie K, Reid L, Yoshida T, Edamura K, Maeda N, Smithies O. Jakobovits A. Inactivation of Mouse HPRT locus by a 203-bp retrotransposon insertion and a 55-kb gene-targeted deletion: establishment of new HPRT-Deficient mouse embryonic stem cell lines. Genomics Vol. 42, pp: 413-421 (1997); Sherman-Gold, R. Monoclonal Antibodies: The Evolution from '80s Magic Bullets To Mature, Mainstream Applications as Clinical Therapeutics. Genetic Engineering News Vol. 17, Number 14 (August 1997); Mendez M, Green L, Corvalan J, Jia X-C, Maynard-Currie C, Yang X-d, Gallo M, Louie D, Lee D, Erickson K, Luna J, Roy C, Abderrahim H, Kirschenbaum F, Noguchi M, Smith D, Fukushima A, Hales J, Finer M, Davis C, Zsebo K, Jakobovits A. Functional transplant of megabase human immunoglobulin loci recapitulates human antibody response in mice. Nature Genetics Vol. 15, pp: 146-156 (1997); Jakobovits A. Mice engineered with human immunoglobulin YACs: A new technology for production of fully human antibodies for autoimmunity therapy. Weir's Handbook of Experimental Immunology, The Integrated Immune System Vol. IV, pp: 194.1-194.7 (1996); Jakobovits A. Production of fully human antibodies by transgenic mice. Current Opinion in Biotechnology Vol. 6, No. 5, pp: 561-566 (1995); Mendez M, Abderrahim H, Noguchi M, David N, Hardy M, Green L, Tsuda H, Yoast S, Maynard-Currie C, Garza D, Gemmill R, Jakobovits A, Klapholz S. Analysis of the structural integrity of YACs comprising human immunoglobulin genes in yeast and in embryonic stem cells. Genomics Vol. 26, pp: 294-307 (1995); Jakobovits A. YAC Vectors: Humanizing the mouse genome. Current Biology Vol. 4, No. 8, pp: 761-763 (1994); Arbones M, Ord D, Ley K, Ratech H, Maynard-Curry K, Otten G, Capon D, Tedder T. Lymphocyte homing and leukocyte rolling and migration are impaired in L-selectin-deficient mice. Immunity Vol. 1, No. 4, pp: 247-260 (1994); Green L, Hardy M, Maynard-Curry K, Tsuda H, Louie D, Mendez M, Abderrahim H, Noguchi M, Smith D, Zeng Y, et. al. Antigen-specific human monoclonal antibodies from mice engineered with human Ig heavy and light chain YACs. Nature Genetics Vol. 7, No. 1, pp: 13-21 (1994); Jakobovits A, Moore A, Green L, Vergara G, Maynard-Curry K, Austin H, Klapholz S. Germ-line transmission and expression of a human-derived yeast artificial chromosome. Nature Vol. 362, No. 6417, pp: 255-258 (1993) Jakobovits A, Vergara G, Kennedy J, Hales J, McGuinness R, Casentini-Borocz D, Brenner D, Otten G. Analysis of homozygous mutant chimeric mice: deletion of the immunoglobulin heavy-chain joining region blocks B-cell development and antibody production. Proceedings of the National Academy of Sciences USA Vol. 90, No. 6, pp: 2551-2555 (1993); Kucherlapati et al., U.S. Pat. No. 6,1075,181.
Antibodies can also be made using phage display techniques. Such techniques can be used to isolate an initial antibody or to generate variants with altered specificity or avidity characteristics. Single chain Fv can also be used as is convenient. They can be made from vaccinated transgenic mice, if desired. Antibodies can be produced in cell culture, in phage, or in various animals, including but not limited to cows, rabbits, goats, mice, rats, hamsters, guinea pigs, sheep, dogs, cats, monkeys, chimpanzees, apes.
Antibodies can be labeled with a detectable moiety such as a radioactive atom, a chromophore, a fluorophore, or the like. Such labeled antibodies can be used for diagnostic techniques, either in vivo, or in an isolated test sample. Antibodies can also be conjugated, for example, to a pharmaceutical agent, such as chemotherapeutic drug or a toxin. They can be linked to a cytokine, to a ligand, to another antibody. Suitable agents for coupling to antibodies to achieve an anti-tumor effect include cytokines, such as interleukin 2 (IL-2) and Tumor Necrosis Factor (TNF); photosensitizers, for use in photodynamic therapy, including aluminum (III) phthalocyanine tetrasulfonate, hematoporphyrin, and phthalocyanine; radionuclides, such as iodine-131 (131I), yttrium-90 (90Y), bismuth-212 (212Bi), bismuth-213 (213Bi), technetium-99m (99mTc), rhenium-186 (186Re), and rhenium-188 (188Re); antibiotics, such as doxorubicin, adriamycin, daunorubicin, methotrexate, daunomycin, neocarzinostatin, and carboplatin; bacterial, plant, and other toxins, such as diphtheria toxin, pseudomonas exotoxin A, staphylococcal enterotoxin A, abrin-A toxin, ricin A (deglycosylated ricin A and native ricin A), TGF-alpha toxin, cytotoxin from chinese cobra (naja naja atra), and gelonin (a plant toxin); ribosome inactivating proteins from plants, bacteria and fungi, such as restrictocin (a ribosome inactivating protein produced by Aspergillus restrictus), saporin (a ribosome inactivating protein from Saponaria officinalis), and RNase; tyrosine kinase inhibitors; ly207702 (a difluorinated purine nucleoside); liposomes containing antitumor agents (e.g., antisense oligonucleotides, plasmids which encode for toxins, methotrexate, etc.); and other antibodies or antibody fragments, such as F(ab).
Those of skill in the art will readily understand and be able to make such antibody derivatives, as they are well known in the art. The antibodies may be cytotoxic on their own, or they may be used to deliver cytotoxic agents to particular locations in the body. The antibodies can be administered to individuals in need thereof as a form of passive immunization.
Characterization of extracellular regions for the cell surface and secreted proteins from the protein sequence is based on the prediction of signal sequence, transmembrane domains and functional domains. Antibodies are preferably specifically immunoreactive with membrane associated proteins, particularly to extracellular domains of such proteins or to secreted proteins. Such targets are readily accessible to antibodies, which typically do not have access to the interior of cells or nuclei. However, in some applications, antibodies directed to intracellular proteins may be useful as well. Moreover, for diagnostic purposes, an intracellular protein may be an equally good target since cell lysates may be used rather than a whole cell assay.
Computer programs can be used to identify extracellular domains of proteins whose sequences are known. Such programs include SMART software (Schultz et al., Proc. Natl. Acad. Sci. USA 95: 5857-5864, 1998) and Pfam software (Bateman et al., Nucleic acids Res. 28: 263-266, 2000) as well as PSORTII. Typically such programs identify transmembrane domains; the extracellular domains are identified as immediately adjacent to the transmembrane domains. Prediction of extracellular regions and the signal cleavage sites are only approximate. It may have a margin of error + or −5 residues. Signal sequence can be predicted using three different methods (Nielsen et al, Protein Engineering 10: 1-6, 1997, Jagla et. al, Bioinformatics 16: 245-250, 2000, Nakai, K and Horton, P. Trends in Biochem. Sci. 24:34-35, 1999) for greater accuracy. Similarly transmembrane (TM) domains can be identified by multiple prediction methods. (Pasquier, et. al, Protein Eng. 12:381-385, 1999, Sonnhammer et al., In Proc. of Sixth Int. Conf. on Intelligent Systems for Molecular Biology, p. 175-182, Ed J. Glasgow, T. Littlejohn, F. Major, R. Lathrop, D. Sankoff, and C. Sensen Menlo Park, Calif.: AAAI Press, 1998, Klein, et. al, Biochim. Biophys. Acta, 815:468, 1985, Nakai and Kanehisa Genomics, 14: 897-911, 1992). In ambiguous cases, locations of functional domains in well characterized proteins are used as a guide to assign a cellular localization.
Putative functions or functional domains of novel proteins can be inferred from homologous regions in the database identified by BLAST searches (Altschul et. al. Nucleic Acid Res. 25: 3389-3402, 1997) and/or from a conserved domain database such as Pfam (Bateman et.al, Nucleic Acids Res. 27:260-262 1999) BLOCKS (Henikoff, et. al, Nucl. Acids Res. 28:228-230, 2000) and SMART (Ponting, et. al, Nucleic Acid Res. 27,229-232, 1999). Extracellular domains include regions adjacent to a transmembrane domain in a single transmembrane domain protein (out-in or type I class). For multiple transmembrane domains proteins, the extracellular domain also includes those regions between two adjacent transmembrane domains (in-out and out-in). For type II transmembrane domain proteins, for which the N-terminal region is cytoplasmic, regions following the transmembrane domain is generally extracellular. Secreted proteins on the other hand do not have a transmembrane domain and hence the whole protein is considered as extracellular.
Membrane associated proteins can be engineered to delete the transmembrane domains, thus leaving the extracellular portions which can bind to ligands. Such soluble forms of transmembrane receptor proteins can be used to compete with natural forms for binding to ligand. Thus such soluble forms act as inhibitors. and can be used therapeutically as anti-angiogenic agents, as diagnostic tools for the quantification of natural ligands, and in assays for the identification of small molecules which modulate or mimic the activity of a TEM:ligand complex.
Alternatively, the endothelial markers themselves can be used as vaccines to raise an immune response in the vaccinated animal or human. For such uses, a protein, or immunogenic fragment of such protein, corresponding to the intracellular, extracellular or secreted TEM of interest is administered to a subject. The immogenic agent may be provided as a purified preparation or in an appropriately expressing cell. The administration may be direct, by the delivery of the immunogenic agent to the subject, or indirect, through the delivery of a nucleic acid encoding the immunogenic agent under conditions resulting in the expression of the immunogenic agent of interest in the subject. The TEM of interest may be delivered in an expressing cell, such as a purified population of tumor endothelial cells or a populations of fused tumor endothelial and dendritic cells. Nucleic acids encoding the TEM of interest may be delivered in a viral or non-viral delivery vector or vehicle. Non-human sequences encoding the human TEM of interest or other mammalian homolog can be used to induce the desired immunologic response in a human subject. For several of the TEMs of the present invention, mouse, rat or other ortholog sequences are described herein or can be obtained from the literature or using techniques well within the skill of the art.
Endothelial cells can be identified using the markers which are disclosed herein as being endothelial cell specific. These include the human markers identified by SEQ ID NOS: 1-172, i.e., the normal, pan-endothelial, and the tumor endothelial markers. Homologous mouse markers include tumor endothelial markers of SEQ ID NO: 182-186 and 190-194. Antibodies specific for such markers can be used to identify such cells, by contacting the antibodies with a population of cells containing some endothelial cells. The presence of cross-reactive material with the antibodies identifies particular cells as endothelial. Similarly, lysates of cells can be tested for the presence of cross-reactive material. Any known format or technique for detecting cross-reactive material can be used including, immunoblots, radioimmunoassay, ELISA, immunoprecipitation, and immunohistochemistry. In addition, nucleic acid probes for these markers can also be used to identify endothelial cells. Any hybridization technique known in the art including Northern blotting, RT-PCR, microarray hybridization, and in situ hybridization can be used.
One can identify tumor endothelial cells for diagnostic purposes, testing cells suspected of containing one or more TEMs. One can test both tissues and bodily fluids of a subject. For example, one can test a patient's blood for evidence of intracellular and membrane associated TEMs, as well as for secreted TEMs. Intracellular and/or membrane associated TEMs may be present in bodily fluids as the result of high levels of expression of these factors and/or through lysis of cells expressing the TEMs.
Populations of various types of endothelial cells can also be made using the antibodies to endothelial markers of the invention. The antibodies can be used to purify cell populations according to any technique known in the art, including but not limited to fluorescence activated cell sorting. Such techniques permit the isolation of populations which are at least 50, 60, 70, 80, 90, 92, 94, 95, 96, 97, 98, and even 99% the type of endothelial cell desired, whether normal, tumor, or pan-endothelial. Antibodies can be used to both positively select and negatively select such populations. Preferably at least 1, 5, 10, 15, 20, or 25 of the appropriate markers are expressed by the endothelial cell population.
Populations of endothelial cells made as described herein, can be used for screening drugs to identify those suitable for inhibiting the growth of tumors by virtue of inhibiting the growth of the tumor vasculature.
Populations of endothelial cells made as described herein, can be used for screening candidate drugs to identify those suitable for modulating angiogenesis, such as for inhibiting the growth of tumors by virtue of inhibiting the growth of endothelial cells, such as inhibiting the growth of the tumor or other undesired vasculature, or alternatively, to promote the growth of endothelial cells and thus stimulate the growth of new or additional large vessel or microvasculature.
Inhibiting the growth of endothelial cells means either regression of vasculature which is already present, or the slowing or the absence of the development of new vascularization in a treated system as compared with a control system. By stimulating the growth of endothelial cells, one can influence development of new (neovascularization) or additional vasculature development (revascularization). A variety of model screen systems are available in which to test the angiogenic and/or anti-angiogenic properties of a given candidate drug. Typical tests involve assays measuring the endothelial cell response, such as proliferation, migration, differentiation and/or intracellular interaction of a given candidate drug. By such tests, one can study the signals and effects of the test stimuli. Some common screens involve measurement of the inhibition of heparanase, endothelial tube formation on Matrigel, scratch induced motility of endothelial cells, platelet-derived growth factor driven proliferation of vascular smooth muscle cells, and the rat aortic ring assay (which provides an advantage of capillary formation rather than just one cell type).
Drugs can be screened for the ability to mimic or modulate, inhibit or stimulate, growth of tumor endothelium cells and/or normal endothelial cells. Drugs can be screened for the ability to inhibit tumor endothelium growth but not normal endothelium growth or survival. Similarly, human cell populations, such as normal endothelium populations or tumor endothelial cell populations, can be contacted with test substances and the expression of tumor endothelial markers and/or normal endothelial markers determined. Test substances which decrease the expression of tumor endothelial markers (TEMs) are candidates for inhibiting angiogenesis and the growth of tumors. Conversely, markers which are only expressed in normal endothelium but not in tumor endothelium (NEMs) can be monitored. Test substances which increase the expression of such NEMs in tumor endothelium and other human cells can be identified as candidate antitumor or anti-angiogenic drugs In cases where the activity of a TEM or NEM is known, agents can be screened for their ability to decrease or increase the activity.
For those tumor endothelial markers identified as containing transmembrane regions, it is desirable to identify drug candidates capable of binding to the TEM receptors found at the cell surface. For some applications, the identification of drug candidates capable of blocking the TEM receptor from its native ligand will be desired. For some applications, the identification of a drug candidate capable of binding to the TEM receptor may be used as a means to deliver a therapeutic or diagnostic agent. For other applications, the identification of drug candidates capable of mimicing the activity of the native ligand will be desired. Thus, by manipulating the binding of a transmembrane TEM receptor:ligand complex, one may be able to promote or inhibit further development of endothelial cells and hence, vascularization.
For those tumor endothelial markers identified as being secreted proteins, it is desirable to identify drug candidates capable of binding to the secreted TEM protein. For some applications, the identification of drug candidates capable of interfering with the binding of the secreted TEM it is native receptor. For other applications, the identification of drug candidates capable of mimicing the activity of the native receptor will be desired. Thus, by manipulating the binding of the secreted TEM:receptor complex, one may be able to promote or inhibit further development of endothelial cells, and hence, vascularization.
Expression can be monitored according to any convenient method. Protein or mRNA can be monitored. Any technique known in the art for monitoring specific genes' expression can be used, including but not limited to ELISAs, SAGE, microarray hybridization, Western blots. Changes in expression of a single marker may be used as a criterion for significant effect as a potential pro-angiogenic, anti-angiogenic or anti-tumor agent. However, it also may be desirable to screen for test substances which are able to modulate the expression of at least 5, 10, 15, or 20 of the relevant markers, such as the tumor or normal endothelial markers. Inhibition of TEM protein activity can also be used as a drug screen. Human and mouse TEMS can be used for this purpose.
Test substances for screening can come from any source. They can be libraries of natural products, combinatorial chemical libraries, biological products made by recombinant libraries, etc. The source of the test substances is not critical to the invention. The present invention provides means for screening compounds and compositions which may previously have been overlooked in other screening schemes. Nucleic acids and the corresponding encoded proteins of the markers of the present invention can be used therapeutically in a variety of modes. NEMs, can be used to restrict, diminish, reduce, or inhibit proliferation of tumor or other abnormal or undesirable vasculature. TEMs can be used to stimulate the growth of vasculature, such as for wound healing or to circumvent a blocked vessel. The nucleic acids and encoded proteins can be administered by any means known in the art. Such methods include, using liposomes, nanospheres, viral vectors, non-viral vectors comprising polycations, etc. Suitable viral vectors include adenovirus, retroviruses, and sindbis virus. Administration modes can be any known in the art, including parenteral, intravenous, intramuscular, intraperitoneal, topical, intranasal, intrarectal, intrabronchial, etc.
Specific biological antagonists of TEMs can also be used to therapeutic benefit. For example, antibodies, T cells specific for a TEM, antisense to a TEM, and ribozymes specific for a TEM can be used to restrict, inhibit, reduce, and/or diminish tumor or other abnormal or undesirable vasculature growth. Such antagonists can be administered as is known in the art for these classes of antagonists generally. Anti-angiogenic drugs and agents can be used to inhibit tumor growth, as well as to treat diabetic retinopathy, rheumatoid arthritis, psoriasis, polycystic kidney disease (PKD), and other diseases requiring angiogenesis for their pathologies.
Mouse counterparts to human TEMS can be used in mouse cancer models or in cell lines or in vitro to evaluate potential anti-angiogenic or anti-tumor compounds or therapies. Their expression can be monitored as an indication of effect. Mouse TEMs are disclosed in SEQ ID NO: 182-186 and 190-194. Mouse TEMs can be used as antigens for raising antibodies which can be tested in mouse tumor models. Mouse TEMs with transmembrane domains are particularly preferred for this purpose. Mouse TEMs can also be used as vaccines to raise an immunological response in a human to the human ortholog.
The above disclosure generally describes the present invention. All references disclosed herein are expressly incorporated by reference. A more complete understanding can be obtained by reference to the following specific examples which are provided herein for purposes of illustration only, and are not intended to limit the scope of the invention.
EXAMPLE 1
Visualization of Vasculature of Colorectal Cancers
The endothelium of human colorectal cancer was chosen to address the issues of tumor angiogenesis, based on the high incidence, relatively slow growth, and resistance to anti-neoplastic agents of these cancers. While certain less common tumor types, such as glioblastomas, are highly vascularized and are regarded as good targets for anti-angiogenic therapy, the importance of angiogenesis for the growth of human colorectal cancers and other common solid tumor types is less well documented.
We began by staining vessels in colorectal cancers using von Willebrand Factor (vWF) as a marker. In each of 6 colorectal tumors, this examination revealed a high density of vessels throughout the tumor parenchyma (Examples in FIGS. 1A and B). Interestingly, these analyses also substantiated the importance of these vessels for tumor growth, as endothelium was often surrounded by a perivascular cuff of viable cells, with a ring of necrotic cells evident at the periphery (Example in FIG. 1A). Although these preliminary studies suggested that colon tumors are angiogenesis-dependent, reliable markers that could distinguish vessels in colon cancers from the vessels in normal colon are currently lacking. One way to determine if such markers exist is by analyzing gene expression profiles in endothelium derived from normal and neoplastic tissue.
EXAMPLE 2
Purification of Endothelial Cells
Global systematic analysis of gene expression in tumor and normal endothelium has been hampered by at least three experimental obstacles. First, endothelium is enmeshed in a complex tissue consisting of vessel wall components, stromal cells, and neoplastic cells, requiring highly selective means of purifying ECs for analysis. Second, techniques for defining global gene expression profiles were not available until recently. And third, only a small fraction of the cells within a tumor are endothelial, mandating the development of methods that are suitable for the analysis of global expression profiles from relatively few cells.
To overcome the first obstacle, we initially attempted to purify ECs from dispersed human colorectal tissue using CD31, an endothelial marker commonly used for this purpose. This resulted in a substantial enrichment of ECs but also resulted in contamination of the preparations by hematopoietic cells, most likely due to expression of CD31 by macrophages. We therefore developed a new method for purifying ECs from human tissues using P1H12, a recently described marker for ECs. Unlike CD31, P1H12 was specifically expressed on the ECs of both colorectal tumors and normal colorectal mucosa. Moreover, immunofluorescence staining of normal and cancerous colon with a panel of known cell surface endothelial markers (e.g. VE-cadherin, CD31 and CD34) revealed that P1H12 was unique in that it stained all vessels including microvessels (see FIG. 2A and data not shown). In addition to selection with P1H 12, it was necessary to optimize the detachment of ECs from their neighbors without destroying their cell surface proteins as well as to employ positive and negative affinity purifications using a cocktail of antibodies (FIG. 2B). The ECs purified from normal colorectal mucosa and colorectal cancers were essentially free of epithelial and hematopoietic cells as judged by RT-PCR (FIG. 2C) and subsequent gene expression analysis (see below).
EXAMPLE 3
Comparison of Tumor and Normal Endothelial Cell Expression Patterns
To overcome the remaining obstacles, a modification of the Serial Analysis of Gene Expression (SAGE) technique was used. SAGE associates individual mRNA transcripts with 14 base pair tags derived from a specific position near their 3′ termini. The abundance of each tag provides a quantitative measure of the transcript level present within the mRNA population studied. SAGE is not dependent on pre-existing databases of expressed genes, and therefore provides an unbiased view of gene expression profiles. This feature is particularly important in the analysis of cells that constitute only a small fraction of the tissue under study, as transcripts from these cells are unlikely to be well represented in extant EST databases. We adapted the SAGE protocol so that it could be used on small numbers of purified ECs obtained from the procedure outlined in FIG. 2B. A library of  ̃100,000 tags from the purified ECs of a colorectal cancer, and a similar library from the ECs of normal colonic mucosa from the same patient were generated. These  ̃193,000 tags corresponded to over 32,500 unique transcripts. Examination of the expression pattern of hematopoietic, epithelial and endothelial markers confirmed the purity of the preparations (FIG. 2D).
EXAMPLE 4
Markers of Normal and Tumor Endothelium
We next sought to identify Pan Endothelial Markers (PEMs), that is, transcripts that were expressed at significantly higher levels in both normal and tumor associated endothelium compared to other tissues. To identify such PEMs, tags expressed at similar levels in both tumor and normal ECs were compared to  ̃1.8 million tags from a variety of cell lines derived from tumors of non-endothelial origin. This simple comparison identified 93 transcripts that were strikingly EC-specific, i.e. expressed at levels at least 20-fold higher in ECs in vivo compared to non-endothelial cells in culture. The 15 tags corresponding to characterized genes which were most highly and specifically expressed in endothelium are shown in Table 1A. Twelve of these 15 most abundant endothelial transcripts had been previously shown to be preferentially expressed in endothelium, while the other 3 genes had not been associated with endothelium in the past (Table 1A). These data sets also revealed many novel PEMs, which became increasingly prevalent as tag expression levels decreased (Table 1B). For many of the transcripts, their endothelial origin was confirmed by SAGE analysis of 401,000 transcripts derived from primary cultures of human umbilical vein endothelial cells (HUVEC) and human dermal microvascular endothelial cells (HMVEC) (Table 1A and B). To further validate the expression of these PEMs in vivo, we developed a highly sensitive non-radioactive in situ hybridization method that allowed the detection of transcripts expressed at relatively low levels in frozen sections of human tissues. Two uncharacterized markers, PEM3 and PEM6, were chosen for this analysis. In each case, highly specific expression was clearly limited to vascular ECs in both normal and neoplastic tissues (FIGS. 3A and B and data not shown). These data also suggest that ECs maintained in culture do not completely recapitulate expression patterns observed in vivo. For example, Hevin and several other PEM's were expressed at high levels in both tumor and normal ECs in vivo, but few or no transcripts were detected in cultured HUVEC or HMVEC (Table 1). The source of the Hevin transcripts was confirmed to be endothelium by in situ hybridization in normal and malignant colorectal tissue (FIG. 3C).
Many of the markers reported in Table 1 were expressed at significantly higher levels than previously characterized genes commonly associated with ECs. For example, the top 25 markers were all expressed at greater than 200 copies per cell. In contrast, the receptors for VEGF (VEGFR-1 and VEGFR-2) were expressed at less than 20 copies per cell. Interestingly, VEGFR2 (KDR), which had previously been reported to be up-regulated in vessels during colon cancer progression, was found to be expressed in both normal and neoplastic colorectal tissue (FIGS. 3D and E). The lack of specificity of this gene was in accord with the SAGE data, which indicated that the VEGFR was expressed at 12 copies per cell in both normal and tumor endothelium.
EXAMPLE 5
Tumor Versus Normal Endothelium
We next attempted to identify transcripts that were differentially expressed in endothelium derived from normal or neoplastic tissues. This comparison revealed 33 tags that were preferentially expressed in normal-derived endothelium at levels at least 10-fold higher than in tumor-derived endothelium. Conversely, 46 tags were expressed at 10-fold or higher levels in tumor vessels. Because those transcripts expressed at higher levels in tumor endothelium are most likely to be useful in the future for diagnostic and therapeutic purposes, our subsequent studies focussed on this class. Of the top 25 tags most differentially expressed, 12 tags corresponded to 11 previously identified genes, one with an alternative polyadenylation site (see Table 2). Of these 10 genes, 6 have been recognized as markers associated with angiogenic vessels. The remaining 14 tags corresponded to uncharacterised genes, most of which have only been deposited as ESTs (Table 2).
To validate the expression patterns of these genes, we chose to focus on 9 Tumor Endothelial Markers (BSC-TEM 1-9; TEM 1, 2, 5, 9, 16, 17, 19, and 22) for which EST sequences but no other information was available (Table 2). These tags were chosen simply because they were among the most differentially expressed on the list and because we were able to obtain suitable probes. In many cases, this required obtaining near full-length sequences through multiple rounds of sequencing and cDNA walking (See accession numbers in Table 2). RT-PCR analysis was then used to evaluate the expression of the corresponding transcripts in purified ECs derived from normal and tumor tissues of two patients different from the one used to construct the SAGE libraries. As shown in FIG. 4A, the vWF gene, expected to be expressed in both normal and tumor endothelium on the basis of the SAGE data as well as previous studies, was expressed at similar levels in normal and tumor ECs from both patients, but was not expressed in purified tumor epithelial cells. As expected, PEM2 displayed a pattern similar to vWF. In contrast, all 9 TEMs chosen for this analysis were prominently expressed in tumor ECs, but were absent or barely detectable in normal ECs (Table 3 and examples in FIG. 4A). It is important to note that these RT-PCR assays were extremely sensitive indicators of expression, and the absence of detectable transcripts in the normal endothelium, combined with their presence in tumor endothelial RNAs even when diluted 100-fold, provides compelling confirmatory evidence for their differential expression. These results also show that these transcripts were not simply expressed differentially in the ECs of the original patient, but were characteristic of colorectal cancer endothelium in general.
It could be argued that the results noted above were compromised by the possibility that a small number of non-endothelial cells contaminated the cell populations used for SAGE and RT-PCR analyses, and that these non-endothelial cells were responsible for the striking differences in expression of the noted transcripts. To exclude this possibility, we performed in situ hybridization on normal and neoplastic colon tissue. In every case where transcripts could be detected (BSC-TEM 1, 3, 4, 5, 7, 8, and 9; TEM 1, 5, 9, 17, and 19), they were specifically localized to ECs (Table 3 and examples in FIGS. 4B and C). Although caution must be used when interpreting negative in situ hybridization results, none of the TEMs were expressed in vascular ECs associated with normal colorectal tissue even though vWF and Hevin were clearly expressed (Table 3).
EXAMPLE 6
Tumor Endothelium Markers are Expressed in Multiple Tumor Types
Were these transcripts specifically expressed in the endothelium within primary colorectal cancers, or were they characteristic of tumor endothelium in general? To address this question, we studied the expression of a representative TEM (BSC-TEM7; TEM 17) in a liver metastasis from a colorectal cancer, a sarcoma, and in primary cancers of the lung, pancreas, breast and brain. As shown in FIG. 4, the transcript was found to be expressed specifically in the endothelium of each of these cancers, whether metastatic (FIG. 4D) or primary (FIG. 4E-I). Analysis of the other six TEMs, (BSC-TEM 1, 3, 4, 5, 7, 8 and 9; TEM 1, 5, 9, 17, and 19) revealed a similar pattern in lung tumors, brain tumors, and metastatic lesions of the liver (see Table 3).
EXAMPLE 7
Tumor Endothelium Markers are Neo-angiogenic
Finally, we asked whether these transcripts were expressed in angiogenic states other than that associated with tumorigenesis. We thus performed in situ hybridizations on corpus luteum tissue as well as healing wounds. Although there were exceptions, we found that these transcripts were generally expressed both in the corpus luteum and in the granulation tissue of healing wounds (Table 3 and example in FIG. 4J). In all tissues studied, expression of the genes was either absent or exclusively confined to the EC compartment.
REFERENCES AND NOTES
The disclosure of each reference cited is expressly incorporated herein.

    1. J. Folkman, in Cancer Medicine J. Holland, Bast Jr, R C, Morton D L, Frei III, E, Kufe, D W, Weichselbaum, R R, Ed. (Williams & Wilkins, Baltimore, 1997) pp. 181.
    2. R. S. Kerbel, Carcinogenesis 21, 505 (2000).
    3. P. Wesseling, D. J. Ruiter, P. C. Burger, J Neurooncol 32, 253 (1997).
    4. Q. G. Dong, et al., Arterioscler Thromb Vasc Biol 17, 1599 (1997).
    5. P. W. Hewett, J. C. Murray, In Vitro Cell Dev Biol Anim 32, 462 (1996).
    6. M. A. Hull, P. W. Hewett, J. L. Brough, C. J. Hawkey, Gastroenterology 111, 1230 (1996).
    7. G. Haraldsen, et al., Gut 37, 225 (1995).
    8. The original EC isolation protocol was the same as that shown in FIG. 2B except that dispersed cells were stained with anti-CD31 antibodies instead of anti-P1H12, and magnetic beads against CD64 and CD14 were not included in the negative selection. After generating 120,000 SAGE tags from these two EC preparations, careful analysis of the SAGE data revealed that, in addition to endothelial-specific markers, several macrophage-specific markers were also present.
    9. A. Solovey, et al., N Engl J Med 337, 1584 (1997).
    10. V. E. Velculescu, L. Zhang, B. Vogelstein, K. W. Kinzler, Science 270, 484-487 (1995).
    11. In order to reduce the minimum amount of starting material required from  ̃50 million cells to  ̃50,000 cells (i.e.  ̃1000-fold less) we and others (38) have introduced several modifications to the original SAGE protocol. A detailed version of our modified “MicroSAGE” protocol is available from the authors upon request.
    12. 96,694 and 96,588 SAGE tags were analyzed from normal and tumor derived ECs, respectively, and represented 50,298 unique tags. A conservative estimate of 32,703 unique transcripts was derived by considering only those tags observed more than once in the current data set or in the 134,000 transcripts previously identified in human transcriptomes (39).
    13. To identify endothelial specific transcripts, we normalized the number of tags analyzed in each group to 100,000, and limited our analysis to transcripts that were expressed at levels at least 20-fold higher in ECs than in non-endothelial cell lines in culture and present at fewer than 5 copies per 100,000 transcripts in non-endothelial cell lines and the hematopoietic fraction ( ̃57,000 tags) (41). Non-endothelial cell lines consisted of 1.8×106 tags derived from a total of 14 different cancer cell lines including colon, breast, lung, and pancreatic cancers, as well as one non-transformed keratinocyte cell line, two kidney epithelial cell lines, and normal monocytes. A complete list of PEMs is available at www.sagenet.org\angio\table1.htm.
    14. M. Tucci, et al., J Endocrinol 157, 13 (1998).
    15. T. Oono, et al., J Invest Dermatol 100, 329 (1993).
    16. K. Motamed, Int J Biochem Cell Biol 31, 1363 (1999).
    17. N. Bardin, et al., Tissue Antigens 48, 531 (1996).
    18. D. M. Bradham, A. Igarashi, R. L. Potter, G. R. Grotendorst, J Cell Biol 114, 1285 (1991).
    19. K. Akaogi, et al., Proc Natl Acad Sci USA 93, 8384 (1996).
    20. Y. Muragaki, et al., Proc Natl Acad Sci USA 92, 8763 (1995).
    21. M. L. Iruela-Arispe, C. A. Diglio, E. H. Sage, Arterioscler Thromb 11, 805 (1991).
    22. J. P. Girard, T. A. Springer, Immunity 2, 113 (1995).
    23. E. A. Jaffe, et al., J Immunol 143, 3961 (1989).
    24. J. P. Girard, et al., Am J Pathol 155, 2043 (1999).
    25. H. Ohtani, N. Sasano, J Electron Microsc 36, 204 (1987).
    26. For non-radioactive in situ hybridization, digoxigenin (DIG)-labelled sense and anti-sense riboprobes were generated through PCR by amplifying 500-600 bp products and incorporating a T7 promoter into the anti-sense primer. In vitro transcription was performed using DIG RNA labelling reagents and T7 RNA polymerase (Roche, Indianapolis, Ind.). Frozen tissue sections were fixed with 4% paraformaldehyde, penneabilized with pepsin, and incubated with 200 ng/ml of riboprobe overnight at 55° C. For signal amplification, a horseradish peroxidase (HRP) rabbit anti-DIG antibody (DAKO, Carpinteria, Calif.) was used to catalyse the deposition of Biotin-Tyramide (from GenPoint kit, DAKO). Further amplification Was achieved by adding HRP rabbit anti-biotin (DAKO), biotin-tyramide, and then alkaline-phosphatase (AP) rabbit anti-biotin (DAKO). Signal was detected using the AP substrate Fast Red TR/Napthol AS-MX (Sigma, St. Louis, Mo.), and cells were counterstained with hematoxylin unless otherwise indicated. A detailed protocol including the list of primers used to generate the probes can be obtained from the authors upon request.
    27. Transcript copies per cell were calculated assuming an average cell contains 300,000 transcripts.
    28. R. S. Warren, H. Yuan, M. R. Matli, N. A. Gillett, N. Ferrara, J Clin Invest 95, 1789 (1995).
    29. Y. Takahashi, Y. Kitadai, C. D. Bucana, K. R. Cleary, L. M. Ellis, Cancer Res 55, 3964 (1995).
    30. L. F. Brown, et al., Cancer Res 53, 4727 (1993).
    31. Endothelial-specific transcripts were defined as those expressed at levels at least 5-fold higher in ECs in vivo than in non-endothelial cell lines in culture (13), and present at no more than 5 copies per 100,000 transcripts in non-endothelial cell lines and the hematopoietic cell fraction (41). Transcripts showing statistically different levels of expression (P<0.05) were then identified using Monte Carlo analysis as previously described (40). Transcripts preferentially expressed in normal endothelium were then defined as those expressed at levels at least 10-fold higher in normal endothelium than in tumor endothelium. Conversely, tumor endothelial transcripts were at least 10-fold higher in tumor versus normal endothelium. See www.sagenet.org\angio\table2.htm and www.sagenet.org\angio\table3.htm for a complete list of differentially expressed genes.
    32. M. Iurlaro, et al., Eur J Clin Invest 29, 793 (1999).
    33. W. S. Lee, et al., Circ Res 82, 845 (1998).
    34. J. Niquet, A. Represa, Brain Res Dev Brain Res 95, 227 (1996).
    35. L. Fouser, L. Iruela-Arispe, P. Bornstein, E. H. Sage, J Biol Chem 266, 18345 (1991).
    36. M. L. Iruela-Arispe, P. Hasselaar, H. Sage, Lab Invest 64, 174 (1991).
    37. H. F. Dvorak, N Engl J Med 315, 1650 (1986).
    38. B. Virlon, et al., Proc Natl Acad Sci USA 96, 15286 (1999).
    39. V. E. Velculescu, et al., Nat Genet 23, 387 (1999).
    40. L. Zhang, et al., Science 276, 1268 (1997).
    41. Human colon tissues were obtained within 1⁄2 hour after surgical removal from patients. Sheets of epithelial cells were peeled away from normal tissues with a glass slide following treatment with 5 mM DDT, then 10 mM EDTA, leaving the lamina propria intact. After a 2 h incubation in collagenase at 37° C., cells were filtered sequentially through 400 um, 100 um, 50 um and 25 um mesh, and spun through a 30% pre-formed Percoll gradient to pellet RBCs. Epithelial cells (Epithelial Fraction), which were found to non-specifically bind magnetic beads, were removed using Dynabeads coupled to BerEP4 (Dynal, Lake Success, N.Y.). Subsequently, macrophages and other leukocytes (Hematopoietic Fraction) were removed using a cocktail of beads coupled to anti-CD45, anti-CD 14 and anti-CD64 (Dynal). The remaining cells were stained with P1H12 antibody, purified with anti-mouse IgG-coupled magnetic beads, and lysed in mRNA lysis buffer. A detailed protocol can be obtained from the authors upon request.
    42. H. Sheikh, H. Yarwood, A. Ashworth, C. M. Isacke, J Cell Sci 113, 1021-32 (2000).



















SEQ ID
SEQ ID




Sequence name
NO:
NO:
Sequence name





















PEM 1
1
1
PEM 1



PEM 2
2
2
PEM 2



PEM 3
3
3
PEM 3



PEM 4
4
4
PEM 4



PEM 5
5
5
PEM 5



PEM 6
6
6
PEM 6



PEM 7
7
7
PEM 7



PEM 8
8
8
PEM 8



PEM 9
9
9
PEM 9



PEM 10
10
10
PEM 10



PEM 11
11
11
PEM 11



PEM 12
12
12
PEM 12



PEM 13
13
13
PEM 13



PEM 14
14
14
PEM 14



PEM 15
15
15
PEM 15



PEM 16
16
16
PEM 16



PEM 17
17
17
PEM 17



PEM 18
18
18
PEM 18



PEM 19
19
19
PEM 19



PEM 20
20
20
PEM 20



PEM 21
21
21
PEM 21



PEM 22
22
22
PEM 22



PEM 23
23
23
PEM 23



PEM 24
24
24
PEM 24



PEM 25
25
25
PEM 25



PEM 26
26
26
PEM 26



PEM 27
27
27
PEM 27



PEM 28
28
28
PEM 28



PEM 29
29
29
PEM 29



PEM 30
30
30
PEM 30



PEM 31
31
31
PEM 31



PEM 32
32
32
PEM 32



PEM 33
33
33
PEM 33



PEM 34
34
34
PEM 34



PEM 35
35
35
PEM 35



PEM 36
36
36
PEM 36



PEM 37
37
37
PEM 37



PEM 38
38
38
PEM 38



PEM 39
39
39
PEM 39



PEM 40
40
40
PEM 40



PEM 41
41
41
PEM 41



PEM 42
42
42
PEM 42



PEM 43
43
43
PEM 43



PEM 44
44
44
PEM 44



PEM 45
45
45
PEM 45



PEM 46
46
46
PEM 46



PEM 47
47
47
PEM 47



PEM 48
48
48
PEM 48



PEM 49
49
49
PEM 49



PEM 50
50
50
PEM 50



PEM 51
51
51
PEM 51



PEM 52
52
52
PEM 52



PEM 53
53
53
PEM 53



PEM 54
54
54
PEM 54



PEM 55
55
55
PEM 55



PEM 56
56
56
PEM 56



PEM 57
57
57
PEM 57



PEM 58
58
58
PEM 58



PEM 59
59
59
PEM 59



PEM 60
60
60
PEM 60



PEM 61
61
61
PEM 61



PEM 62
62
62
PEM 62



PEM 63
63
63
PEM 63



PEM 64
64
64
PEM 64



PEM 65
65
65
PEM 65



PEM 66
66
66
PEM 66



PEM 67
67
67
PEM 67



PEM 68
68
68
PEM 68



PEM 69
69
69
PEM 69



PEM 70
70
70
PEM 70



PEM 71
71
71
PEM 71



PEM 72
72
72
PEM 72



PEM 73
73
73
PEM 73



PEM 74
74
74
PEM 74



PEM 75
75
75
PEM 75



PEM 76
76
76
PEM 76



PEM 77
77
77
PEM 77



PEM 78
78
78
PEM 78



PEM 79
79
79
PEM 79



PEM 80
80
80
PEM 80



PEM 81
81
81
PEM 81



PEM 82
82
82
PEM 82



PEM 83
83
83
PEM 83



PEM 84
84
84
PEM 84



PEM 85
85
85
PEM 85



PEM 86
86
86
PEM 86



PEM 87
87
87
PEM 87



PEM 88
88
88
PEM 88



PEM 89
89
89
PEM 89



PEM 90
90
90
PEM 90



PEM 91
91
91
PEM 91



PEM 92
92
92
PEM 92



PEM 93
93
93
PEM 93



TEM 1
94
94
TEM 1



TEM 2
95
95
TEM 2



TEM 3
96
96
TEM 3



TEM 4
97
97
TEM 4



TEM 5
98
98
TEM 5



TEM 6
99
99
TEM 6



TEM 7
100
100
TEM 7



TEM 8
101
101
TEM 8



TEM 9
102
102
TEM 9



TEM 10
103
103
TEM 10



TEM 11
104
104
TEM 11



TEM 12
105
105
TEM 12



TEM 13
106
106
TEM 13



TEM 14
107
107
TEM 14



TEM 15
108
108
TEM 15



TEM 16
109
109
TEM 16



TEM 17
110
110
TEM 17



TEM 18
111
111
TEM 18



TEM 19
112
112
TEM 19



TEM 20
113
113
TEM 20



TEM 21
114
114
TEM 21



TEM 22
115
115
TEM 22



TEM 23
116
116
TEM 23



TEM 24
117
117
TEM 24



TEM 25
118
118
TEM 25



TEM 26
119
119
TEM 26



TEM 27
120
120
TEM 27



TEM 28
121
121
TEM 28



TEM 29
122
122
TEM 29



TEM 30
123
123
TEM 30



TEM 31
124
124
TEM 31



TEM 32
125
125
TEM 32



TEM 33
126
126
TEM 33



TEM 34
127
127
TEM 34



TEM 35
128
128
TEM 35



TEM 36
129
129
TEM 36



TEM 37
130
130
TEM 37



TEM 38
131
131
TEM 38



TEM 39
132
132
TEM 39



TEM 40
133
133
TEM 40



TEM 41
134
134
TEM 41



TEM 42
135
135
TEM 42



TEM 43
136
136
TEM 43



TEM 44
137
137
TEM 44



TEM 45
138
138
TEM 45



TEM 46
139
139
TEM 46



NEM 1
140
140
NEM 1



NEM 2
141
141
NEM 2



NEM 3
142
142
NEM 3



NEM 4
143
143
NEM 4



NEM 5
144
144
NEM 5



NEM 6
145
145
NEM 6



NEM 7
146
146
NEM 7



NEM 8
147
147
NEM 8



NEM 9
148
148
NEM 9



NEM 10
149
149
NEM 10



NEM 11
150
150
NEM 11



NEM 12
151
151
NEM 12



NEM 13
152
152
NEM 13



NEM 14
153
153
NEM 14



NEM 15
154
154
NEM 15



NEM 16
155
155
NEM 16



NEM 17
156
156
NEM 17



NEM 18
157
157
NEM 18



NEM 19
158
158
NEM 19



NEM 20
159
159
NEM 20



NEM 21
160
160
NEM 21



NEM 22
161
161
NEM 22



NEM 23
162
162
NEM 23



NEM 24
163
163
NEM 24



NEM 25
164
164
NEM 25



NEM 26
165
165
NEM 26



NEM 27
166
166
NEM 27



NEM 28
167
167
NEM 28



NEM 29
168
168
NEM 29



NEM 30
169
169
NEM 30



NEM 31
170
170
NEM 31



NEM 32
171
171
NEM 32



NEM 33
172
172
NEM 33



TEM 1 DNA
173
173
TEM 1 DNA



TEM 2 DNA
174
174
TEM 2 DNA



TEM 7 DNA
175
175
TEM 7 DNA



TEM 8 DNA
176
176
TEM 8 DNA



TEM 1 Protein
177
177
TEM 1 Protein



TEM 2 Protein
178
178
TEM 2 Protein



TEM 8 Protein
179
179
TEM 8 Protein



TEM 5 DNA
180
180
TEM 5 DNA



TEM 7B DNA
181
181
TEM 7B DNA



mTEM 1 DNA
182
182
mTEM 1 DNA



mTEM 5 DNA
183
183
mTEM 5 DNA



mTEM 7 DNA
184
184
mTEM 7 DNA



mTEM 7B DNA
185
185
mTEM 7B DNA



mTEM 8 DNA
186
186
mTEM 8 DNA



TEM 8 Protein
187
187
TEM 8 Protein



TEM 5 Protein
188
188
TEM 5 Protein



TEM 7B Protein
189
189
TEM 7B Protein



mTEM 1 Protein
190
190
mTEM 1 Protein



mTEM 5 Protein
191
191
mTEM 5 Protein



mTEM 7 Protein
192
192
mTEM 7 Protein



mTEM 7b Protein
193
193
mTEM 7b Protein



mTEM 8 Protein
194
194
mTEM 8 Protein



TEM 1 DNA
195
195
TEM 1 DNA



TEM 1 Protein
196
196
TEM 1 Protein



TEM 2 DNA
197
197
TEM 2 DNA



TEM 2 Protein
198
198
TEM 2 Protein



TEM 3 DNA
199
199
TEM 3 DNA



TEM 3 Protein
200
200
TEM 3 Protein



TEM 4 DNA
201
201
TEM 4 DNA



TEM 4 Protein
202
202
TEM 4 Protein



TEM 5 DNA
203
203
TEM 5 DNA



TEM 5 Protein
204
204
TEM 5 Protein



TEM 6 DNA
205
205
TEM 6 DNA



TEM 6 Protein
206
206
TEM 6 Protein



TEM 7 DNA
207
207
TEM 7 DNA



TEM 7 Protein
208
208
TEM 7 Protein



TEM 8 DNA
209
209
TEM 8 DNA



TEM 8 Protein
210
210
TEM 8 Protein



TEM 9 DNA
211
211
TEM 9 DNA



TEM 9 Protein
212
212
TEM 9 Protein



TEM 10 DNA
213
213
TEM 10 DNA



TEM 10 Protein
214
214
TEM 10 Protein



TEM 11 DNA
215
215
TEM 11 DNA



TEM 11 Protein
216
216
TEM 11 Protein



TEM 12 DNA
217
217
TEM 12 DNA



TEM 12 Protein
218
218
TEM 12 Protein



TEM 13 DNA
219
219
TEM 13 DNA



TEM 13 Protein
220
220
TEM 13 Protein



TEM 14a DNA
221
221
TEM 14a DNA



TEM 14b DNA
222
222
TEM 14b DNA



TEM 14a Protein
223
223
TEM 14a Protein



TEM 14b Protein
224
224
TEM 14b Protein



TEM 15 DNA
225
225
TEM 15 DNA



TEM 15 Protein
226
226
TEM 15 Protein



TEM 16 DNA
227
227
TEM 16 DNA



TEM 16 Protein
228
228
TEM 16 Protein



TEM 17 DNA
229
229
TEM 17 DNA



TEM 17 Protein
230
230
TEM 17 Protein



TEM 19 DNA
231
231
TEM 19 DNA



TEM 19 Protein
232
232
TEM 19 Protein



TEM 20 DNA
233
233
TEM 20 DNA



TEM 20 Protein
234
234
TEM 20 Protein



TEM 21 DNA
235
235
TEM 21 DNA



TEM 21 Protein
236
236
TEM 21 Protein



TEM 22 DNA
237
237
TEM 22 DNA



TEM 22 Protein
238
238
TEM 22 Protein



TEM 24 DNA
239
239
TEM 24 DNA



TEM 24 Protein
240
240
TEM 24 Protein



TEM 25 DNA
241
241
TEM 25 DNA



TEM 25 Protein
242
242
TEM 25 Protein



TEM 27 DNA
243
243
TEM 27 DNA



TEM 27 Protein
244
244
TEM 27 Protein



TEM 28 DNA
245
245
TEM 28 DNA



TEM 28 Protein
246
246
TEM 28 Protein



TEM 29 DNA
247
247
TEM 29 DNA



TEM 29 Protein
248
248
TEM 29 Protein



TEM 30 DNA
249
249
TEM 30 DNA



TEM 30 Protein
250
250
TEM 30 Protein



TEM 31 DNA
251
251
TEM 31 DNA



TEM 31 Protein
252
252
TEM 31 Protein



TEM 33 DNA
253
253
TEM 33 DNA



TEM 33 Protein
254
254
TEM 33 Protein



TEM 35 DNA
255
255
TEM 35 DNA



TEM 35 Protein
358
256
TEM 36 DNA



TEM 36 DNA
256
257
TEM 36 Protein



TEM 36 Protein
257
258
TEM 37 DNA



TEM 37 DNA
258
259
TEM 37 Protein



TEM 37 Protein
259
260
TEM 38 DNA



TEM 38 DNA
260
261
TEM 38 Protein



TEM 38 Protein
261
262
TEM 39 DNA



TEM 39 DNA
262
263
TEM 39 Protein



TEM 39 Protein
263
264
TEM 40 DNA



TEM 40 DNA
264
265
TEM 40 Protein



TEM 40 Protein
265
266
TEM 41 DNA



TEM 41 DNA
266
267
TEM 41 Protein



TEM 41 Protein
267
268
TEM 42 DNA



TEM 42 DNA
268
269
TEM 42 Protein



TEM 42 Protein
269
270
TEM 44 DNA



TEM 44 DNA
270
271
TEM 44 Protein



TEM 44 Protein
271
272
TEM 45 DNA



TEM 45 DNA
272
273
TEM 45 Protein



TEM 45 Protein
273
274
TEM 46 DNA



TEM 46 DNA
274
275
TEM 46 Protein



TEM 46 Protein
275
276
NEM 4 DNA



NEM 4 DNA
276
277
NEM 4 Protein



NEM 4 Protein
277
278
NEM 14 DNA



NEM 14 DNA
278
279
NEM 14 Protein



NEM 14 Protein
279
280
NEM 17 DNA



NEM 17 DNA
280
281
NEM 17 Protein



NEM 17 Protein
281
282
NEM 22 DNA



NEM 22 DNA
282
283
NEM 22 Protein



NEM 22 Protein
283
284
NEM 23 DNA



NEM 23 DNA
284
285
NEM 23 Protein



NEM 23 Protein
285
286
NEM 23 Secreted



NEM 23 Secreted
286
287
NEM 23 Short



NEM 23 Short
287
288
NEM 33 DNA



NEM 33 DNA
288
289
NEM 33 Protein



NEM 33 Protein
289
290
mTEM 1 DNA



mTEM 1 DNA
290
291
mTEM 1 Protein



mTEM 1 Protein
291
292
mTEM 2 DNA



mTEM 2 DNA
292
293
mTEM 2 Protein



mTEM 2 Protein
293
294
mTEM 9 DNA



mTEM 3 DNA
298
295
mTEM 9 Protein



mTEM 3 Protein
299
296
mTEM 17 DNA



mTEM 9 DNA
294
297
mTEM 17 Protein



mTEM 9 Protein
295
298
mTEM 3 DNA



mTEM 13 DNA
302
299
mTEM 3 Protein



mTEM 13 Protein
303
300
mTEM 19 DNA



mTEM 17 DNA
296
301
mTEM 19 Protein



mTEM 17 Protein
297
302
mTEM 13 DNA



mTEM 19 DNA
300
303
mTEM 13 Protein



mTEM 19 Protein
301
304
mTEM 22 DNA



mTEM 22 DNA
304
305
mTEM 22 Protein



mTEM 22 Protein
305
306
mTEM 30 DNA



mTEM 30 DNA
306
307
mTEM 30 Protein



mTEM 30 Protein
307
308
TEM 2 tag



TEM 2 tag
308
309
TEM 1 long tag



TEM 1 long tag
309
310
TEM 3 long tag



TEM 3 long tag
310
311
TEM 4 long tag



TEM 4 long tag
311
312
TEM 5 long tag



TEM 5 long tag
312
313
TEM 5 long tag



TEM 5 long tag
313
314
TEM 6 long tag



TEM 6 long tag
314
315
TEM 7 long tag



TEM 7 long tag
315
316
TEM 8 long tag



TEM 8 long tag
316
317
TEM 9 long tag



TEM 9 long tag
317
318
TEM 10 long tag



TEM 10 long tag
318
319
TEM 10 long tag



TEM 10 long tag
319
320
TEM 10 long tag



TEM 10 long tag
320
321
TEM 11 long tag



TEM 11 long tag
321
322
TEM 12 long tag



TEM 12 long tag
322
323
TEM 13 long tag



TEM 13 long tag
323
324
TEM 13 long tag



TEM 13 long tag
324
325
TEM 14 long tag



TEM 14 long tag
325
326
TEM 15 long tag



TEM 15 long tag
326
327
TEM 15 long tag



TEM 15 long tag
327
328
TEM 16 long tag



TEM 16 long tag
328
329
TEM 17 long tag



TEM 17 long tag
329
330
TEM 19 long tag



TEM 19 long tag
330
331
TEM 21 long tag



TEM 21 long tag
331
332
TEM 21 long tag



TEM 21 long tag
332
333
TEM 22 long tag



TEM 22 long tag
333
334
TEM 22 long tag



TEM 22 long tag
334
335
TEM 23 long tag



TEM 23 long tag
335
336
TEM 24 long tag



TEM 24 long tag
336
337
TEM 25 long tag



TEM 25 long tag
337
338
TEM 25 long tag



TEM 25 long tag
338
339
TEM 28 long tag



TEM 28 long tag
339
340
TEM 30 long tag



TEM 30 long tag
340
341
TEM 31 long tag



TEM 31 long tag
341
342
TEM 32 long tag



TEM 32 long tag
342
343
TEM 33 long tag



TEM 33 long tag
343
344
TEM 33 long tag



TEM 33 long tag
344
345
TEM 35 long tag



TEM 35 long tag
345
346
TEM 36 long tag



TEM 36 long tag
346
347
TEM 37 long tag



TEM 37 long tag
347
348
TEM 38 long tag



TEM 38 long tag
348
349
TEM 38 long tag



TEM 38 long tag
349
350
TEM 39 long tag



TEM 39 long tag
350
351
TEM 40 long tag



TEM 40 long tag
351
352
TEM 41 long tag



TEM 41 long tag
352
353
TEM 42 long tag



TEM 42 long tag
353
354
TEM 43 long tag



TEM 43 long tag
354
355
TEM 44 long tag



TEM 44 long tag
355
356
TEM 45 long tag



TEM 45 long tag
356
357
TEM 46 long tag



TEM 46 long tag
357
358
TEM 35 Protein

## Claims

1. An isolated and purified nucleic acid molecule comprising the sequence as shown in SEQ ID NO: 173, said sequence encoding a transmembrane TEM1.

2. An isolated and purified nucleic acid molecule comprising the coding sequence for a transmembrane TEM1 as shown in SEQ ID NO: 177.

3. An isolated and purified nucleic acid molecule comprising the coding sequence for an extracellular domain of TEM1 comprising amino acid residues 1 to 685 as shown in SEQ ID NO: 177.

4. The isolated and purified nucleic acid molecule of claim 3 which consists of amino acid residues 1 to 685 as shown in SEQ ID NO: 177.

5. The isolated and purified nucleic acid molecule of claim 3 which comprises nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

6. The isolated and purified nucleic acid molecule of claim 3 which consists of nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

7. A cultured host cell comprising a vector comprising a cDNA which encodes an immunogenic agent, wherein the host cell expresses said immunogenic agent, wherein the immunogenic agent comprises the extracellular domain of TEM1 comprising amino acid residues 1 to 685 as shown in SEQ ID NO: 177.

8. The host cell of claim 7 wherein the cDNA comprises the sequence shown in SEQ ID NO: 173.

9. The host cell of claim 7 wherein the cDNA comprises the coding sequence for a transmembrane TEM1 as shown in SEQ ID NO: 177.

10. The host cell of claim 7 wherein the cDNA consists of a coding sequence for amino acid residues 1 to 685 as shown in SEQ ID NO: 177.

11. The host cell of claim 7 wherein the cDNA comprises nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

12. The host cell of claim 7 wherein the cDNA consists of nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

13. A method of making a TEM1 protein preparation, comprising:
culturing a host cell comprising a vector comprising a cDNA which encodes an immunogenic agent, wherein the host cell expresses said immunogenic agent, wherein the immunogenic agent comprises the extracellular domain of TEM1 comprising amino acid residues 1 to 685 as shown in SEQ ID NO: 177;
isolating protein expressed by the host cell from other cellular constituents.

14. The method of claim 13 wherein the cDNA comprises the sequence shown in SEQ ID NO: 173.

15. The method of claim 13 wherein the cDNA comprises the coding sequence for a transmembrane TEM1 as shown in SEQ ID NO: 177.

16. The method of claim 13 wherein the cDNA comprises the coding sequence for an extracellular domain of TEM1 comprising amino acid residues 1 to 685 as shown in SEQ ID NO: 177.

17. The method of claim 13 wherein the cDNA comprises nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

18. The method of claim 13 wherein the cDNA consists of nucleotides 6 to 2060 as shown in SEQ ID NO: 173.

19. A cultured host cell comprising a vector comprising a cDNA which encodes an immunogenic agent, wherein the host cell expresses said immunogenic agent, wherein the immunogenic agent is selected from the group consisting of TEM 1 protein as shown in SEQ ID NO: 177 and an immunogenic fragment of said TEM1 protein.

20. A method of making a TEM 1 protein preparation, comprising: culturing a host cell comprising a vector comprising a cDNA encoding an immunogenic agent whereby said immunogenic agent is expressed in the host cell, wherein the immunogenic agent is selected from the group consisting of TEM1 protein as shown in SEQ ID NO: 177 and an immunogenic fragment of said TEM1 protein; isolating protein expressed by the host cell from other cellular constituents.