HUMANIZED B-B10, AN ANTI-IL2 RECEPTOR ANTIBODY

Abstract: A humanized antibody is provided, which is obtained by transplantation of the complementarity determining region of a mouse monoclonal antibody B-B10 specific to a human IL-2 receptor into a human antibody. The antibody has a very low antigenicity, and therefore, it is useful for treatment of carcinoma expressing IL-2 receptor.

Description: HUMANIZED B-BIO, AN ANTI-IL2 RECEPTOR ANTIBODY FIELD OF THE INVENTION The present invention relates to a humanized antibody specific to a human IL-2 receptor. More particularly, it relates to a humanized antibody obtained by transplantation of the complementarity- determining region (hereinafter, referred to as CDR) of a mouse monoclonal antibody B-BIO specific to a human IL-2 receptor into a human antibody, and a composition comprising said antibody as an active ingredient. BACKGROUND OF THE INVENTION The structure and function of the antibody related to the present invention will be first explained. Namely, such structure and function are described in details in Kabat et al. : Sequences of proteins of im unological interest, 4th Ed., 1989, NIH, U.S.A. as well as Roitt et al.: Immunology, 2nd Ed., 1989, Gower Medical Publishing, U.S.A. & U.K. The antibody (immunoglobulin) is an antigen- specific glycoprotein as produced by B lymphocytes when a subject is sensitized with an antigen which is a foreign substance to the subject.. As the human immunoglobulin, there are known 5 classes, i.e., IgG, IgM, IgA, igD and IgE. In case of IgG, it has two light chains (L chains) of polypeptide having a molecular weight of about 25,000 and two heavy chains (H chains) of polypeptide having a molecular weight of about 51,000. Between H-L chains and between H-H chains, there is usually present a disulfide bond connecting two chains. An amino acid sequence consisting of about 100 amino acids at N terminal of each of the H and L chains is antigen-specific and represents an antigen-binding site. This part is called a variable (V) region. Subsequent amino acid sequence consisting of 400 amino acids in H chain or 150 amino acids in L chain is called a constant (C) region which is identical among all immunoglobulins belonging to a Ig Class such as IgG or IgM Class, or those belonging to a subclass such as igG x or IgG 2 . It is known that human IgG may have CK or Cλ in L chain and Cγl, Cγ2, Cγ3 or Cγ4 in H chain. L and H chains having one of these identified partial structures are called K, λ , γl, γ2, γ3 and γ4 chain, respectively. H and L chain contain "domain structures". For instance, H chain is composed of VH, CHI, CH2, CH3 domains and hinge regions connecting CHI and CH2 domains. The variable region comprises four framework regions in which relatively conservative amino acid sequences are retained among various antibodies and three CDRs which are relatively variable in the amino acid sequence among different antibodies. In one molecule of an antibody which comprises two H chains and two L chains, there ar present six CDRs originated from VH and VL regions, which take steric configurations closely approached one another to form an antigen binding site. The summary of the structure and function of the antibody is as above. The monoclonal antibody (hereinafter, referred to as "MAb" ) is widely used for diagnosis and therapy in the medical field and as reagents, affinity column materials, etc. in the industrial field. The mouse MAb is readily obtained by the mouse/mouse hybridoma method. For preparation of a human MAb which is more valuable for human therapy that a mouse MAb, various improvements have been proposed but any reliable method for establishing a producible cell line with good reproducibility and high efficiency has not been established. Because of this reason, human MAb as clinically usable is quite restricted. Also, the production of a human antibody to an antigen originated from a human being is generally impossible except any special case. In case of a mouse, MAb specific to various antigens including antigens of human origin can be easily obtained but on administration to a human being, a problem of antigenicity occurs. Some attempts have been made to produce an antibody lowered in antigenicity to a human body from mouse MAb. Specifically, attempts are directed to the production of a humanized antibody wherein only a CDR, which is said to form an antigen-binding site, in the variable region of mouse MAb, is left and all the other regions are replaced by the human ones. For instance, in the method as disclosed in EP-A- 87302620, the CDR of mouse MAb is transplanted into the human MAb V region by the use of site specific mutation with a long oligonucleotide. As an example of obtaining a humanized antibody as explained above, there is known an attempt for humanization of rat MAb Campath-1 recognizing CDw52 antigen on human T calls (EP-A-89301291) . As one of mouse MAbs for which humanization would be effective, there is known anti-human IL-2 receptor antibody B-BIO (Japanese Patent Publication (Unexamined) No. 2-13371). This antibody is antagonistic to the binding of IL-2 to the IL-2 receptor on human T-cells and inhibits the IL-2 dependent growth of activated T-cells. It also inhibits the human mixed lymphocyte reaction. Accordingly, said MAb is useful for treatment and prevention of the diseases caused by graf -versus-host reaction or host- versus-graft reaction, prevention of rejection on the transplantation of bone marrow, kidney, heart, lung. pancreas, skin, liver, etc., therapy of T-cell dependent allergy or autoimmune diseases (E.g., myocarditis, diabetes mellitus, myasthenia gravis, lupus erythematosus, Crohn disease, multiple sclerosis, AIDS, Meningitis, Arthritis) and therapy of tumors expressing IL-2 receptor such as T- cell leukemia. In fact, the administration of B-BIO on the graft-versus-host reaction as produced after the bone marrow transplantation or the preventive administration of B-BIO on the rejection of the liver transplantation produces a certain effect (Blood, Vol. 75, 1017 (1990); Lancet, Vol. 335, 1596 (1990)). On the practical therapy, however, the administration of B-BIO is carried out only for a short period of time, because of a concern to the antigenicity of mouse MAb. Also, there is a clinical example where an antibody to mouse MAb was found from a patient to whom mouse MAb was administered. The administration over a long period of time is thus quite difficult from the practical viewpoint. As understood from this, the administration of B-B10 is limited due to the fact that it is a kind of mouse MAb and the therapeutic effect is also restricted. In order to solve the above problem, it is necessary to decrease the antigenicity originated from the mouse antibody by humanization. As to humanized antibodies, there are present some other examples in addition to those as hereinabove mentioned. For instance, an anti-Tac antibody is humanized by transplantation of nine amino acid residues on the framework in addition to CDR, and as the result of the humanization, the activity is lowered to 1/3 (Proc. Natl. Acad. Sci. USA Vol. 86, 10029 (1989)). Also, the humanized antibodies to the gB glycoprotein and gD glycoprotein of herpes simplex virus are transplanted respectively with two amino acids residues and eight amino acid residues on the framework in addition to CDR, and their activities are respectively 1/2 and 1 in comparison with mouse MAb (Proc. Natl. Acad. Sci. USA, Vol. 88, 2869 (1991)). Further, the humanized antibody to the human CD4 is transplanted with one amino acid residue in addition to CDR, and its activity is 1/3 in comparison with mouse MAb (Proc. Natl. Acad. Sci. USA, Vol. 88, 4181 (1991)). As understood from the above, it is necessary for obtaining a humanized antibody having an activity similar to mouse MAb to transplant not only CDR but also an amino acid residue(s) which would afford an important influence on the antigen-antibody binding in the framework of mouse MAb. However, such amino acid residue(s) are different depending upon the kind of the antibody; in fact, the examples as above recited shown that some amino acid residues are common to them and some others are not. It is thus required to determine the necessary amino acid residue(s) on each antibody. Like the case of the humanized antibody to the gD glycoprotein of herpes simplex virus, such an approach as leaving the amino acid sequence on the framework expected to participate in the antigen- antibody binding as in mouse MAb. In this case, however, the same amino acid residue as in mouse MAb increase so that the antigenicity of mouse MAb is increased. When the framework of mouse MAb contains one or more amino acid residues which rarely exist in human antibodies, they are, in principle, concerted to other amino acid residues highly common to human antibodies. Thus, sixteen amino acid residues on the framework have been substituted in this case. As understood from the above, it is necessary for obtaining a humanized antibody to identify amino acid residue(s) on the framework which appear essential for retaining the activity and to transplant them to the human antibody together with CDR. However, it is very difficult to pre-determine such essential amino acid residue(s). Accordingly, transplantation of all of the amino acid residues on the framework, which appear possibly involved in antigen- binding activity, is desirable in preparing humanized antibody. However, the humanized antibody thus prepared is destined to include many amino acid residues derived from mouse antibody, and therefore, antigenicity of the humanized antibody may inevitably be high. DISCLOSURE OF THE INVENTION Under the circumstances as noted above, the present inventors attempted the humanization of mouse B- B10. As the result, it has been succeeded to produce humanized B-BIO having an activity similar to mouse B-BIO with transplantation of a minimum amino acid sequence in the framework. Namely, the cDNA of the V region of the antibody was successfully cloned from the hybridoma cell line producing mouse B-BIO by a per se conventional procedure such as the polymerase chain reaction (PCR) method, and the amino acid sequence was determined. Then, the V region of human antibody having a high homology to such amino acid sequence was selected, and the framework of this human antibody was bound with the B-BIO V region CDR and a part of the framework to design several kinds of the humanized B-BIO V region. Such humanized B-BIO is different from mouse B-BIO in the amino acid residue of the framework of which a part was transplanted. The DNA sequence encoding said amino acid residues was synthesized, and a plasmid expressing humanized B-BIO was constructed. The plasmid was introduced into a mouse myeloma cell line to obtain a humanized B-BIO producing cell. Productivity of the antibody was increased by amplification of the antibody-encoding gene, and the resultant several humanized B-BIO antibodies were purified and evaluated on their activities. As a result, the amino acid residues on the framework, which have strong influence on the B-BIO activity and which are called "M5", were clarified. The most active humanized B-BIO was expected to be the one in which as much amino acid residues as possible on the framework of mouse B-BIO, including M5, were transplanted. However, contrary to expectation, the evaluation of the activities revealed that humanized B-BIO obtained by minimum level of transplantation was most active as far as it includes M5. This humanized antibody (M5) is expected to be advantageous with respect to antigenicity, and yet it showed almost the same level of activity as that of mouse B-BIO. The present invention is based on this finding. Since the gene encoding humanized B-BIO has been determined, the preparation of various humanized B-BIO derivatives has become possible by means of recombinant DNA technology. Such B-BIO derivatives include Fv, Fab, and a fuzed protein consisting of the humanized B-BIO and a proteinaceous toxin or an enzyme. The present invention is explained in more detail below. The present invention provides humanized antibodies derived from mouse anti-human IL-2 receptor antibody, B-BIO MAb. One embodiment of the antibodies of the invention is defined by the following CDR in V region and partial amino acid sequences in the framework. H chain V region CDR1: SEQ ID No. 1 CDR2: SEQ ID No. 2 CDR3: SEQ ID No. 3 L chain V region CDR1: SEQ ID No. 4 CDR2: SEQ , ID No. 5 CDR3: SEQ ID No. 6 H chain V region 27th-30th amino acids: SEQ ID No. 7 94th amino acid: Arg L chain V region 49th amino acid: Lys The present invention includes a matured (perfect) humanized B-BIO antibody and its fragments such as Fv, Fab, (Fab)' 2 . The humanized antibody and its fragment of the invention may contain an additional functional, molecule. For instance, they may be bound to a functional molecule such as a toxin (e.g. lysin), an enzyme, or a certain kind of cytokine. BRIEF DESCRIPTIONS OF DRAWINGS Fig. 1 shows DNA sequence encoding mouse B-BIO V region (H chain), and amino acid sequence encoded thereby. Fig. 2 shows DNA sequence encoding mouse B-BIO V region (L chain), and amino acid sequence encoded thereby. Fig. 3 shows comparison of the amino acid sequence of humanized B-B10M0 with the amino acid sequences of mouse B-BIO, and human antibodies KAS and PAY which were used as templates. Position of mutation of Ml-5 is also indicated. In Ml-5, all of the amino acid residues shown in the figure are replaced by the amino acid residues of mouse B-BIO. FR means framework. Fig. 4 shows synthesized DNA sequence of humanized B-B10M0 V region (H chain) . The framed sequence codes for V region. Other sequence comes from FK-001 antibody gene. The underline indicates the position of a primer used in the gene synthesis. Fig. 5 shows synthesized DNA sequence of humanized B-B10M0 V region (L chain) . The framed sequence codes for V region. Other sequence comes from FK-001 antibody gene. The underline indicates the position of a primer used in the gene synthesis. Fig. 6 (a) shows humanized B-BIO H chain expression plasmid, and (b) shows humanized B-BIO L chain expression plasmid. The symbols, B-la and dhfr respectively mean lactamase gene and dihydro folate reductase gene. VH, VK, Cγl, and Ck respectively mean H chain V region gene, k chain V region gene, γl chain constant region gene, and k chain constant region gene. Fig. 7 shows SDS polyacrylamide gel electrophoresis of purified humanized B-BIO. Lanes from left to right correspond to MO, Ml, M2, M3, M4, M5, M123, M45, M12345, and mouse B-BIO. H and L show the position of H chain and L chain respectively. Fig. 8 shows inhibition of IL-2 dependent T-cell proliferation due to humanized B-BIO. OD value on the ordinate is an index for the number of alive cells. Fig. 9 shows inhibition of IL-2 dependent T-cell proliferation due to humanized B-BIO. OD value on the ordinate is an index for the number of alive cells. According to the present invention, humanized B- BIO antibody may be prepared by: 1) constructing a gene encoding a humanized antibody in which at least CDR in V region is derived from mouse B-BIO MAb and other part is derived from human antibody; 2) inserting the gene encoding the humanized antibody into a vector capable of existing in a host cell to obtain an expression plasmid; 3) transfecting the host cell with the plasmid to establish a humanized B-BIO MAb producing cell; and 4) cultivating the cell to produce humanized B- B10 MAb. The production of humanized antibody of the invention with the aid of recombinant DNA technology is explained below. (i) Isolation of RNA from the hybridoma producing mouse B-BIO antibody Several conventional methods are available for isolation of RNA from the hybridoma producing mouse B-BIO antibody. However, the principal procedures common to them are cell lysis in the presence of a protein denaturing agent (e.g. guanidine thiocyanate), and isolation of RNA by phenol extraction or cesium chloride density-gradient centrifugation. Oligo-dT cellulose column chromatography is useful for further purification, if desired. Standard protocol for the procedures is found in a text book, for example, J. Sambrook; Molecular Cloning, A Laboratory Manual; 2nd Ed., 1989, Cold Spring Harbor Laboratory Press, USA. Example 1 hereinafter described gives one example for the isolation. (ii) Isolation and Identification of V region cDNA V region cDNA may be prepared from the RNA isolated in (i) using a primer specific to mouse V region and a reverse transcriptase. The V region cDNA thus obtained may be amplified by means of Polymerase Chain Reaction (PCR) using a specific primer. The primer specific to mouse V region may be prepared according to the teaching of M. J. Coloma, Biotechniques, Vol.11, 1991, p.152; R. Orlandi et al, Proc. Natl. Aca. Sci. USA, Vol.86, 1989, p.3833; or L. Sastry, Pro. Natl. Aca. Sci. USA, Vol.86, 1989, p.5728. Detailed explanation for PCR is given in the aforementioned J. Sambrook's text, particularly in Chapter 14. The V region cDNA thus obtained may be cloned using a plasmid or a phage vector. The amino acid sequence of the cloned cDNA may be determined by dideoxy sequencing (J. Messing, Method in Enzymology, Vol.101, 1983, p.20) or Maxam-Gilbert method (A. M. Maxa & W. Gilbert, Proc. Natl. Aca. Sci. USA, Vol.74, 1977, p.560). Based on the DNA sequence determined, corresponding amino acid sequence can be deduced. Part of the deduced amino acid sequence can be confirmed to be correct by comparison with corresponding partial amino acid sequence of the antibody peptide, which has been determined by a protein sequencer. The amino acid sequence of mouse B-BIO V region thus identified is shown in Figs. 1 and 2. (iii) Design of amino acid sequence of humanized B-BIO V region A human antibody, into which the mouse B-BIO CDR is to be transplanted, may be selected using a database such as Genbank or EMBL. A human antibody V region having a high homology to the amino acid sequence of mouse B-BIO V region is selected. Specifically, KAS antibody for VH and PAY antibody for Vk are recommended. As for the amino acid residues on the framework, which are to be transplanted like CDR, one can take it into consideration that the amino acid residues which is suspected to influence on the formation of CDR's three-dimensional structure have been determined with some accuracy on the basis of the analysis of a three-dimensional structure of a known antibody (canonical structure model; Nature, Vol.342, 1989, p.877). Additional useful information is that the amino acid residues in the framework, which exist close to CDR, may have influence on the CDR's three-dimensional structure. Three-dimensional structure of a designed humanized B-BIO V region can be predicted using an appropriate computer program, preferably BIOCES available from Sumitomo Chemical Company, Limited and Sumitomo Pharmaceuticals Company, Limited. Exemplary design for humanized antibodies of the invention is shown in Fig. 3 of the accompanying drawings and Example 5. (iv) Construction of DNA encoding V region of humanized B-BIO A DNA encoding V region of humanized B-BIO may be constructed by a total synthesis or repeated PCR using a mouse B-BIO or human V region DNA as a template. Additional DNA sequences necessary for expression, such as signal sequence and intron, may be linked to the DNA encoding V region of humanized B-BIO at the 5' or 3' terminal. Example 6 hereinafter described illustrates the synthesis of DNA for humanized B-BIO V region by means of PCR using a mouse B-BIO V region DNA as a template and linkage of the resultant DNA to the DNA encoding the V region of human antibody FK-001 (Japanese Patent Publication (Unexamined) No. 267295/1988) at the 5 r or 3' terminal. An arbitrary amino acid sequence in V region can be changed to a desired sequence using site-directed mutagenesis in vitro. Various humanized B-BIO V region DNAs obtained in the manner as described above are illustrated in Example 7. (v) Construction of expression plasmid for humanized B-BIO If necessary, a translation-initiating signal, a transcription-initiating signal (promoter), an enhancer, etc. may be added to the humanized B-BIO V region DNA. Specific examples of promoters and enhancers are, for example, SV40 (J. Mol. Appl. Genet., Vol.l, 1983, p.327), the promoter/enhancer derived from cytomegalovirus (Cell, Vol.41, 1985, p.521), LTR from Rous sarcoma virus (Proc. Natl. Aca. Sci. USA, Vol.76, 1982, p.6777). Example 6 demonstrates the use of the promoter/enhancer of the gene for human FK-001 antibody. Linkage of human B-BIO V region DNA at the downstream with a gene for a constant (c) region provides a humanized antibody gene. Constant region genes are available from JCRB. The humanized B-BIO H chain and L chain may be introduced into separate or same vector(ε) to construct an expression plasmid. Examples of the expression vectors are SV40- derived vector (J. Mol. Appl. Genet., Vol.l, 1982, p.327), and bovine papilloma virus vector (Proc. Natl. Aca. Sci. USA, Vol.79, 1982, p.7147). Examples 8 and 9 demonstrate the use of ρSV2dhfr (Mol. Cell. Biol., Vol.l, 1981, p.854) and pUC118 (Methods Enzymol. , Vol.153, 1987, p.3) respectively. (vi) Transfection of humanized B-BIO expression plasmid Humanized B-BIO antibody-producing cells capable of expressing humanized B-BIO antibody gene may be obtained by means of a conventional DNA introduction using an animal cell not producing antibodies, preferably mouse myeloma 5 cell. The expression plasmid for the humanized B-BIO antibody gene may be introduced, together with a marker plasmid if desired, into a host cell through conventional procedures such as red cell ghost method (Proc. Natl. Acad. Sci. USA., Vol.77, 1980, p.2163), DEAE-dextran method 10 (Nature, Vol.293, 1981, p.79), calcium phosphate method (Virology, Vol.52, 1973, p.456), protoplast fusion method (Cell, Vol.33, 1981, p.717), electroporation method (Proc. Natl. Aca. Sci. USA, Vol.81, 1984, p.7161), and lipofection method (Proc. Natl. Acad. Sci. USA, Vol.84, 1987, p.7413). 15 DNA-introduced cells may be selected by cultivating the transfected cells in a selective medium containing G- 18 or mycophenolic acid. Humanized B-BIO antibody in a culture supernatant may be detected by enzyme immunoassay (e.g. ELISA), and a humanized B-BIO producing 20. cell can be selected from drug-resistant cells. By cultivating the humanized B-BlO-producing cell, humanized B-BIO can be obtained from the supernatant and purified using conventional chromatography. Productivity of the antibody may be enhanced by using a marker capable of gene- 5 amplification and adding a selective drug to the culture medium, whereby amplification of the antibody gene is induced. Examples 10, 12 and 13 demonstrate the construction of humanized B-BIO expression plasmid using an expression unit of FK-001 antibody gene, the establishment of humanized B-BIO producing cell by transfection of mouse myeloma cell, Sp2/0-Agl4 (available from ATCC) as a host cell, and recovery of humanized B-BIO. Purified humanized B-BIO may be formulated by conventional methods usually employed in the production of a biological preparation. In essence, the purified antibody is sterile-filtered, for instance, with a membrane filter, followed by addition of a stabilizer, (vii) Evaluation of humanized B-BIO Enzyme immunoassay, particularly ELISA, may be used for evaluation of humanized B-BIO (E. Harlow and D. Lane; Antibodies: A Laboratory Manual, 1988, Cold spring Harbor Laboratory, USA; especially Paragraph 14). The amount of the antibody present in a culture medium may be determined by ELISA which uses a plate on which an antibody against H chain C region has been adsorbed. Biological activity of humanized B-BIO may be measured by determining the inhibition of IL-2 dependent proliferation of activated human T cell as illustrated in Examples 11 and 14. The humanized B-BIO antibody of the invention is parenterally administered with a dosage of about 0.05-500 mg for treatment and prevention of diseases caused by graft-versus-host reaction or host-versus-graft reaction, prevention of rejection on the transplantation of bone marrow, kidney, heart, lung, pancreas, skin, liver, etc., therapy of T-cell dependent allergy or autoimmune diseases (e.g. myocarditis, diabetes mellitus, myasthenia gravis, lupus erythematosus, Crohn disease, multiple sclerosis, AIDS, meningitis, arthritis), and therapy of tumors expressing IL-2 receptor such as T-cell leukemia. ADVANTAGEOUS EFFECT OF THE INVENTION 1) Half-life of mouse Mab in blood is about 15 hours, when administered to human (J. Natl. Cancer Inst., Vol.80, 937, 1988), whereas half-life of human IgGl is about 2 weeks. The humanized antibody of the invention is very close to human antibody, and therefore, may possibly have similar half-life to human antibody. It is expected that the humanized B-B10 has much longer half-life in blood and remains effective for a prolonged period of time when compared with mouse B-B10. 2) The effect described in the above item 1) enables to decrease frequency of administration and dosage of the antibody. 3) Antigenicity of humanized B-BIO is much less than mouse B-BIO. As a matter of fact, administration of humanized antibody, Campath-IH, did not induce anti- Campath-IH antibody in two instances (Lancet, Vol.2, 1394, 1988). Accordingly, it is expected that humanized B-BIO, when administered to human, is not likely to induce undesirable neutralization antibody, contrary to mouse B- B10. This permits frequent administration of humanized B- BIO for a long time, which increases therapeutical effects and enlarges the scope of applications. The present invention will be hereinafter explained in detail by way of examples, but is not limited to those examples. Example 1 Extraction and Purification of RNA from a B-B10- Producinσ Hybridoma Hybridomas which produce B-BIO was suspended in 4M guanidine thiocyanate (60 °C) and treated with a syringe attached with a 18G needle to lower the viscosity. To the suspension was added one equivalent of phenol (60 °C) and the mixture shaked vigorously. After the addition of 1/4 volume of 0.1 M sodium acetate (pH 5.2)/10 mM Tris-HCl (pH 7.4)/l mM EDTA and 1/2 volume of a mixture of ' chloroform/isoamyl alcohol (24:1), the suspension was shaked vigorously, ice-cooled and centrifuged. The aqueous phase was taken and RNA was recovered by ethanol precipitation. Example 2 Cloning of cDNA encoding V Region of B-BIO Two cDNAs each encoding VH and Vk region of mouse B-BIO were synthesized using specific primer, amplified by PCR, cloned, and sequenced as follows. Primers "VHback" and "VHfor" which anneal to the N- and C-termini of VH respectively, and primers "Vkfor" and "Vkback" which anneal to N- and C- termini of Vk respectively, were synthesized using an Applied Biosystems Model 380A DNA synthesizer. Sequences of these primers are shown below. VHback: SEQ ID No.10 SEQ ID No.11 VHfor: SEQ ID No.12 SEQ ID No.13 Vkback: SEQ ID No.14 SEQ ID No.15 VKfor: SEQ ID No.16 B-BIO RNA was primed with VHfor primer to yield B-BIO VH cDNA, which was followed by PCR using VHfor and VHback primers. B-B10RNA was primed with Vkfor primer to yield B-BIO Vk cDNA, which.was followed by PCR using Vkfor and Vkback primers. The cDNA was synthesized in a 20 μl reaction mixture containing 50 mM KC1, 10 mM Tris HCl (pH8.3), 1.5 mM MgCl 2 , 0.001% gelatin, each 0.8 mM of dATP, dGTP, dCTP and dTTP, 2μl RNA, and lμM primer in the presence of 20 units reverse transcriptase (RAV-2, Takara Shuzo) for 30 min at 42 °C. After heating the mixture at 95 °C for 5 min, PCR was carried out in a 100 μl reaction mixture containing 50 mM KC1, 10 mM Tris HCl (pH8.3), 1.5 mM MgCl 2 0.001% gelatin, each 0.4 mM of dATP, dGTP, dCTP and dTTP using lμM primer by repeating 40 times of a reaction cycle consisting of heating at 95 °C for 30 sec, 55 °C for 30 sec and 72 °C for 1 min. The products of PCR were then 5'-end phosphorylated using T4 polynucleotide kinase (Takara Shuzo) and cloned into the Hinc II site of plasmid vector pUC19. The DNA sequence was determined by dideoxy method using a commercially available primer for the vicinity of the multi-cloning sites and a Sequenase Version 2.0 DNA Sequencing Kit (United States Biochemical Corporation, USA) according to the manufacturer's recommended protocols. The identified sequences of DNA and deduced amino acid might be incorrect at the N and C terminal regions. However, a correct sequence of the N- terminal region of Vk was obtained without the aid of primer because the Vkback primer annealed to the upper site from 5' terminal of Vk. The correct sequences were thereafter obtained as described in Examples 3 and 4 and provided in the accompanying drawings. Figures 1 and 2. Example 3 Confirmation of the Amino Acid Seguence of the N- terminal Regions of Mouse B-BIO VH by Means of Gas-phase Protein Seguencer Purified mouse B-BIO antibody was mixed with an equivalent amount of a loading buffer (125 mM Tris-HCl, pH 6.8, 4% sodium dodecyl sulfate(SDS) , 10% mercaptoethanol, 0.01% bromophenolblue(BPB)). After heating at 100 °C for 5 min, the mixture was electrophoresed on 12.5% polyacrylamide gel (SDS-PAGE), electroblotted onto PVDF membrane (Millipore, USA) in a 10 mM CAPS (3- cyclohexylaminopropane sulfate, Dojin Chemicals, Inc.) and visualized by staining with Coomassie Brilliant Blue R 250 Wako Junyaku, Japan) . The band containing H chain was excised and the N-terminal amino acid sequences of collected peptide fragments were determined by means of an Applied Biosystems model 470A/120A gas-phase protein seguencer (J.Biol.Chem. , 262:10035 (1987)). The results are shown below. VH N-terminal amino acid sequence: SEQ ID No.17 Example 4 Confirmation of the Amino acid Seguence of the C- • terminal Regions of Mouse B-B10 VH and Vk The DNA sequences each encoding the C-terminal region of mouse B-BIO VH and Vk were amplified by PCR, cloned and sequenced. Primers VH2, MIG-1, Vk2 and MIK-1 which anneal to VHCDR1, N-terminal region of CHI, VkCDRl and N-terminal region of Ck, respectively, were synthesized. Sequences of these primers are shown below. VH2: SEQ ID No.18 Vk2: SEQ ID No.19 MIG-1: SEQ ID No.20 MIK-1: SEQ ID No.21 B-BIO RNA was primed with MIG-1 primer to yield B-BIO VH cDNA, which was followed by PCR using VH2 and MIG- 1 primers. B-BIO RNA was primed with MIK-1 primer to yield B-BIO Vk cDNA, which was followed by PCR using Vk2 and MIK- 1 primers. The cDNA was synthesized in a 50 μl of a reaction mixture containing 50 mM KC1, 10 mM Tris-HCl (pH8.3), 1.5 mM MgCl 2 , 0.001% gelatin, each 0.2 mM of dATP, dGTP, dCTP and dTTP, 2μl RNA, and lμM primer in the presence of 20 units reverse transcriptase (RAV-2, Takara Shuzo) for 1 hr at 42 °C. After heating the mixture at 95 °C for 10 min, 10 μl of the reaction mixture was subject to PCR, which was conducted in a 100 μl reaction mixture containing 50 mM KC1, 10 mM Tris-HCl (pH8.3), 1.5 mM MgCl 2 , 0.001% gelatin, each 0.4 M of dATP, dGTP, dCTP and dTTP, and 1 μM primer by repeating 30 times of a reaction cycle consisting of heating at 95 °C for 1 min, 50 °C for 1 min and 72 °C for 2 min. The products of PCR were separated by a gel-electrophoresis and the desired product was extracted from the gel and purified. The resultant product of PCR was 5'-end phosphorylated using T4 polynucleotide kinase (Takara Shuzo) and cloned into Hinc II site of plasmid vector pUC19. The cloned DNA was sequenced by dideoxy method using a commercially available primer for the vicinity of the multi-cloning sites and a Sequenase Version 2.0 DNA Sequencing Kit (Unite States Biochemical Corporation, USA) according to the manufacturer's recommended protocols. The identified DNA sequence and deduced amino acid sequence are contained in the sequences shown in Figures 1 and 2. Example 5 Design for the Amino Acid Seguence of Humanized B-BIO VH and VK Regions Prinas Data Base was searched for the VH region of human antibody having an amino acid sequence which has the highest homology with the amino acid sequence of mouse B-BIO VH region to select the VH region of human antibody KAS (63% homology). VK region of a human antibody PAY which has the highest homology with Vk region of mouse B- B10 Vk region (57.0 % homology) was also selected and obtained in the same manner. Humanized B-B10 V region was designed by combining the frameworks of these human antibodies to mouse B-BIO CDR except that the amino acids located at Nos. 27 to 30 and 94 which are positioned within frameworks were remained to be those of mouse B-BIO. This is because the amino acids were selected from frameworks which affect on the structure of CDR according to the canonical structure model. The resultant humanized B-BIO was designated as MO. Variants were also obtained by changing amino acid(s) of humanized B-BIO to that of mouse. Thus, by replacing the amino acid(s) of VH region of humanized B-BIO with mouse amino acid(s), following variants were prepared. Ml: at No.48; M2 at Nos. 66 and 67; and M3 at No.105. By replacing the amino acids of Vk region of humanized B-BIO with mouse amino acid(s), following variants were prepared. M4 at Nos. 1 and 3; and M5 at No. 49. In the variants in Ml, 2, 3 and 5, amino acids to be changed were selected because they are close to the CDR and therefore may affect on the structure of CDR. Amino acid(s) which gives a significant difference between mouse B-BIO and MO in the comparison of the predicted steric structures obtained by BIOCES was considered to have a reverse effect on the activity and therefore it was changed to that of mouse. As a result, M4 and M5 were selected. The variants having the above Ml, M2 and M3 was designated as M123, that having the M4 and M5 designated as M45, and that having the Ml, M2, M3, M4 and M5 designated as M12345. The above-mentioned names were used for expressing amino acid variants themselves, antibodies containing the same, and strains producing the antibodies in common. The relationships between these amino acid sequences are provided in Figure 3. Amino acids were numbered according to the teaching of Kabat et al (Sequences of Proteins of Immunological Interest, 4th edition, 1987, NIH, USA). Example 6 Synthesis of Humanized B-BIO MO by PCR Humanized B-BIO VH and Vk genes were synthesized by PCR using cDNA encoding mouse B-BIO VH and Vk regions and a gene encoding FK-001 human antibody (Biotechnology, volume 7, pp. 805-810 (1989)). The DNA sequence of humanized B-BIO V region was designed as shown in Figure 4 and 5 so that a signal peptide and/or intron originated from a gene encoding FK-001 antibody might ligate to the 5' and 3' of the region encoding humanized B-BIO V region. The resultant gene contained DNA encoding VH and the DNA encoding Vk, each of which can be isolated as a Sacl-Ball fragment and Bam HI-Hindlll fragment, respectively for the cloning. The primers shown in the Figures 4 and 5 were used to obtain mouse VH and Vk DNAs, and PCR was conducted using as the template a gene encoding FK-001 antibody. successively. Primers within the V region can anneal to mouse V region gene within the CDR region. The conditions used for the PCR is the same as that described in Example 3. Short PCR products were synthesized and the neighboring two products were combined to obtain a template for the next PCR, and so on. Finally, PCR products containing the desired gene encoding the V region of humanized B-BIO were obtained and cloned into phage vector M13mpl9 or plasmid vector pUC18. The DNA sequence of cloned PCR product was determined by dideoxy method using a commercially available primer (Takara Shuzo) for the vicinity of the multi-cloning sites and a Sequenase Version 2.0 DNA Sequencing Kit (United States Biochemical Corporation, USA) according to the manufacturer's recommended protocols. The synthesized gene encoding humanized B-BIO VH region was excised as a Sacl-Ball fragment and inserted into the Sacl-Ball site of a VH gene fragment of FK-001 antibody, and finally, was cloned into pUC18 as a 5.2 kb BamHI-Hindlll fragment containing FK001 VH promoter, VH region-encoding gene of humanized B-BIO, and IgH enhancer. The resultant plasmid was designated s plasmid phB- B10VHEM0. Plasmid phB-BlOVkMO was constructed by inserting a 1.5 kb BamHI-BamHI fragment containing FK-001 Vk gene promoter to a BamHI site of plasmid pUC18 which comprises humanized B-BIO Vk region-encoding gene cloned into the BamHI-Hindlll site. Example 7 Introduction of Mutations Ml, M2, M3, M4 and M5 into VH and VK Regions of Humanized B-BIO by In Vitro Site- specific Mutagenesis A 5.2 kb BamHI-Hindlll fragment containing VH gene of B-BIO, H-chain promoter, and H-chain enhancer was obtained by digesting plasmid phB-BlOVHEMO with restriction enzymes Ba HI and Hindlll, subjecting to the electrophoresis on agarose gel, and extracting the DNA fragment by Geneclean II. The DNA fragment was then inserted into BamHI- Hindlll site of charomid pUC118 (Takara Shuzo) to obtain plasmid phB-BlOVHE (118). In the same manner as above, plasmid phB-BlOVk (118) was obtained by transferring 2.1 kb Sacl-Hindlll fragment containing Vk gene of plasmid phB- BlOVkMO to pUCllδ. These plasmids were transformed into E. coli MV1184 (Nihon Gene). The resultant transformants were transfected with helper phage M13K07 (Takara Shuzo) and cultured to give phage-like particles containing circular single-stranded DNA. After the purification of phage-like particles, the circular single-stranded DNAs contained therein were extracted and purified to use as a template for the in vitro site-specific mutagenesis. The preparation of the circular single-stranded DNA was conducted according to the protocol attached to the pUC118 products from the supplier. DNA primers used for the in vitro site-specific mutagenesis were synthesized and purified. Nucleotide sequences of these DNAs are shown below. Primer for mutation Ml: SEQ ID No.22 Primer for mutation M2: SEQ ID No.23 Primer for mutation M3: SEQ ID No.24 Primer for mutation M4: SEQ ID No.25 Primer for mutation M5: SEQ ID No.26 In vitro site-specific mutagenesis was carried out using primer Ml, M2 or M3 when the template was phB- B10VHE(118), and primer M4 or M5 when the template was phB- BlθVk(llδ). The primer and the template was mixed and incubated at 70 °C for 3 min, and then at 37 °C for 30 min for the annealing. The annealed product was then reacted in the presence of dCTPαS, 6 units of Klenow fragment and 6 units of T4 DNA ligase at 16 °C for 15 hr for the elongation and ligation and the unreacted template DNAs were removed. The template DNA was nicked by treating with restriction enzyme Neil (5 units) at 37 °C for 90 min. Most of the template DNAs were removed by treating with 50 units of ExoIII nuclease at 37 °C for 30 min. At the end of the process, the resultant product was reacted in the presence of 3 units E. coli DNA polymerase I and 2 units of T4 DNA ligase at 16 °C for 3 hr to obtain a mutation- introduced circular double-stranded DNA. In the above procedures, reagents, buffers, and column for purification were obtained from Oligonucleotide-directed in vitro mutagenesis system version 2 (Amersham, Inc. ) and used according to the protocol provided by the supplier. The reaction mixture containing the mutation-introduced DNA was used to transform into E. coli JM109 to prepare plasmid DNA. The DNA was used to confirm the DNA sequence at the site of mutation by means of dideoxy sequencing method. For the sequencing, the above-mentioned Ml, M2, M3, M4 or M5 primer, or commercially available primer (Takara Shuzo) in the vicinity of the multi-cloning site of pUC 19 was used as a primer and Sequenase Version 2.0 DNA Sequencing Kit (United states Biochemical Corporation, USA) was used for the reaction. These are used according to the protocol provided by the supplier. Multiple mutagenesis for M123 and M45 were conducted by repeating the above-mentioned procedures. The sites of mutations are given in Figure 3. Example 8 Construction of H chain expression plasmid Plasmids phB-BlOVHEMO, Ml, M2, M3, and M123 each containing 5.2kb BamHI-Hind III fragment which encodes VH gene of various B-BIO, H chain promoter, and H chain enhancer were digested with Bam HI and Hind III, and the resultant fragments were subjected to agarose gel electrophoresis to separate the above-noted desired fragment, which was then extracted and purified by means of Geneclean II. Another plasmid containing a separately cloned gene encoding the constant region of human γ 1 chain (Cγl) was digested with Hind III and EcoRI and subjected to agarose gel electrophoresis to separate 16.9kb Hind III- EcoRI fragment containing Cγl gene, which was then extracted and purified by means of Geneclean II. In the same manner as above, 4.2kb Bam HI-EcoRI fragment was separated from plasmid pSV2dhfr and purified. The above-noted three DNA fragments were combined and linked together using T4 DNA ligase to obtain plasmids phB-BlOdhfr HG1M0, Ml, M2, M3, and Ml23 which express various B-BIO H chains. Example 9 Construction of k chain expression plasmid Plasmid containing the cloned FK-001 k chain gene (Biotechnology, Vol.7, 1989, pp.805-810) was digested with restriction enzyme Hind III, and the digest products were electrophoresed on agarose gel to separate 5.6 kb Hind Ill- Hind III fragment containing k chain constant region (Ck) gene, which was then extracted and purified using Geneclean II. Plasmids phB-BlOVkMO, M4, M5 and M45 each containing a Vk gene of various B-BIO were digested with restriction enzyme Hind III followed by BAP treatment. The plasmids and the 5.6kb Hind III- Hind III fragment were treated with T4 DNA ligase, resulting in insertion of the 5.6kb Hind Ill-Hind III fragments into the Hind III site of each of the plasmids to obtain expression plasmids of various B- B10K chains, phB-BlOHKMO, M4, M5 and M45. Example 10 Establishment of various B-BIO antibodies producing cell lines by lipofectin method Mouse myeloma cell line Sp2/0-Agl4 (Sp2/0, ATCC CRL-1581) was cultured in Dulbecco's modified Eagle's medium (DMEM, Nissui, Japan) supplemented with 10% fetal calf serum (FCS, Hyclone, USA) until it reached to logarithmic growth phase. From the culture, 5x10 cells were harvested by centrifugation, suspended in 0.5ml of serum-free medium (Celgrosser H, Sumitomo Pharmaceuticals) and placed into a well on a 6-well plate. Ten μg of each of H chain expression plasmids, 10 μg of L chain expression plasmid, and 5 μg of pSV2neo were digested with restriction enzyme Pvul (Takara Shuzo) to generate lenear DNAs, and then ethanol precipitated to recover the DNAs. The DNAs were suspended in 250 μl of Celgrosser H. Fifty μl of lipofectin was diluted with 200 μl of Celgrosser H, and mixed with the DNA solution above to prepare the DNA/lipofectine complex. The DNA/lipofectin complex was dropwise added to the cell on 6-well plate, and the resulting mixture was incubated at 37°C under 5% C0 2 atmosphere for 7 hours. The cell was harvested, suspended in DMEM containing 10% FCS at a cell density of 5-10xlθVml, and the suspension was dispensed in an amount of 100 μl per well on a 96-well plate. After 1-2 days, 100 μl of DMEM containing 800 μg/ml G-418 (Gibco, USA) and 10% FCS was added to each well. Thereafter, half of the medium was replaced with DMEM containing 400 μg/ml G-418 and 10% FCS every 2-3 days. Eight G-418 resistant colonies were found after about 2 weeks cultivation. Amount of the antibody in culture supernatant from each well was determined by Enzyme-linked immunosorbent assay (ELISA) as described in the following Example, and the wells which contained relatively high concentration of antibody were selected, and the cells from such wells were pooled for use as the antibody-producing cell. Example 11 Determination of the amount of humanized B-B10 (human IgG ( v , k ) ) by ELISA Determination of the amount of humanized B-B10 (human IgG (γ, k)) was accomplished as follow. Anti-human IgG (γ chain) antibody (Cappel, USA) was dissolved in phosphate buffer (pH7.2, NaCl (8g/l), KC1 (0.2g/l), NaHP0 4 «12H 2 0 (2.99g/l) and KH 2 P0 4 (0.2g/l)) (PBS) at a concentration of 10 μg/ml, and placed on 96-well microplate (Falcon, USA) ("microplate") in an amount of 100 μl per well and then incubated at 37°C for 2 hours. One hundred-twenty μl of PBS solution containing 1% bovine serum albumin (BSA) was added to each well and incubated at 37°C for 2 hours to block the protein-unbound area on the microplate. Samples to be assayed for the amount of the antibody were suitably diluted with PBS containing 0.05% Tween 20 (hereinafter referred to as PBST), and added to each well at a ratio of 100 μl per well and incubated at 37°C for 2 hours. After the incubation, samples were removed and wells were washed 3 times with PBST followed by the addition of 100 μl per well of the second antibody solution and subsequent incubation at 37°C for 2 hours. As the second antibody, phosphatase-labeled affinity-purified anti-human immunoglobulin k chain antibody (Tago, USA) was utilized. After removing the second antibody and washing 3 times with PBST, 100 μl of color-developing substrate (lmg/ml disodium P-nitrophenylphosphate in 10% diethanolamine buffer (pH 9.1) containing NaN 3 (0.2mg/ml) and MgCl 2 »6H 2 0 (0.lmg/ml)) was added to each well and reacted at 37°C. After the reaction, optical density of each well was measured at 405 nm using Multiscan (Titertek) . This assay only allows the measurement of the normal human Ig in which γ chain and k chain associate each other. Example 12 Amplification of the antibody gene by the use of MTX and the increased production of the antibody The antibody-producing cell described in the preceding Example was suspended in DMEM/10% FCS containing 50nM MTX (methotrexate, Gibco, USA) at l-5xl0 5 cells/ml, and the 100-200 μl aliquot was dispensed in each well on 96- well ultiplate and then cultured at 37°C under 5% CO atmosphere. After about 2 weeks cultivation, the amount of the antibody in culture supernatant from each well was determined by ELISA in accordance with Example 11. Cells were collected only from the wells which displayed a high OD value, i.e., a high production level of the antibody, and cultured in larger scale to establish a 50nM MTX-resistant cell line. Similarly, a lOOnM, 200nM, or 400nM MTX-resistant cell line was established in the same manner as in the 50nM-resistant cell line. Antibody concentration of the culture supernatant from each of the cell lines was determined by ELISA using as a standard purified MO antibody which had been affinity- purified through Protein A-column as described in the subsequent Example. The results are shown in the following Table 1. Table 1 Antibody Concentration of antibody fμg/mll produced 0 50 100 200 400(nMMTX) 8.7 14.7 3.6 9.0 1.0 9.5 5.3 8.0 1.7 4.5 In these cell lines, an increased amount of the antibody was produced with a cell line of increased MTX- resistance. These MTX-resistant cell lines were cultured in larger scale and finally subcultivated once in serum- free medium (Cellgrowther-H, Sumitomo Pharmaceuticals) to obtain serum-free culture supernatant. Example 13 Purification of Antibodies Serum-free culture supernatant containing various B-B10 antibodies was filtered through filter unit (Nalge, USA) having a pore size of 0.22μm and applied to Protein A- cellophaine column (0.5ml) (Seikagaku Kogyo, Japan) at a flow rate of l-2ml/min. After washing the column with 10ml TM of Immuno Pure Binding Buffer (Pierce, USA), the antibodies bond to the column were eluted with 2ml of Immuno Pure TM Elution Buffer (Pierce, USA). The eluent was neutralized with 0.2ml of 1M Tris-HCl (pH8.0), dialized against PBS, and sterilized by filtration using a filter having a pore size of 0.22μm to obtain purified B-BIO. TM Colorimetric analysis using BCA Protein Assay Reagent (Pierce, USA) and purified bovine IgG (BioRad, USA) as a standard determined a protein content of the purified B- B10. The results are shown in Table 2. The above samples were subjected to SDS polyacrylamide gel electrophoresis according to the method described in Example 3. All of the samples except M123 showed no band other than H and L chain bands, which revealed that the samples had been sufficiently purified. The amount of the contaminant which caused the extra band observed in M123 was very small, and therefore, it is thought harmless in evaluating the activity of the sample. Example 14 Evaluation of biological activities of various variant B-BIO antibodies Biological activities of various purified B-BIO obtained in the preceding Examples were studied. Evaluation of biological activities of various B-BIO was carried out by comparing their activities in inhibiting proliferation of IL-2 dependent human activated T cells. Thus, human T cells activated by phytohemagglutinin (PHA) and recombinant human IL-2 (Colaborative Research, USA) were plated onto 96-well multiplate (Falcon, USA) for cell culture at final concentrations of 4-10x10 cells/lOOμl/well and 0.25ng/100μl/well, respectively. After addition of B- B10 samples of various concentrations, the plate was incubated at 37°C for three days under 5% C0 2 . To each of the wells was added 20μl of 2.5mg/ml MTT (3-(4,5- dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide. suspended in PBS), and four-hour cultivation was conducted at 37°C under 5% C0 2 . Formazan generated in living cells was dissolved in 40mM HCl/isopropanol which had been added to the wells at lOOμl/well. OD 570 for each well was determined using OD 630 as a reference and used as an indication of the number of living cells. The results are shown in Fig. 8, which shows that Proliferation of T cells is inhibited depending on the concentration of B-BIO. Among humanized B-BIO antibodies, M5 showed the highest inhibitory activity, which was estimated as nearly equal to that of mouse B-BIO after comparison of their working concentrations. M5 activity was higher than those of multiple variants M45 and M12345 containing M5. SEQ ID NO: 1 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 5 TOPOLOGY: Linear MOLECULE TYPE: Peptide Asp Thr Tyr Met His 5 5 SEQ ID NO: 2 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 17 TOPOLOGY: Linear MOLECULE TYPE: Peptide Arg lie Asn Pro Thr Asn Gly Asn Thr Lys Tyr Asp Pro Lys Phe 5 10 15 Gin Gly 17 SEQ ID NO: 3 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 9 TOPOLOGY: Linear MOLECULE TYPE: Peptide Arg Gly Asp Ala Met Tyr Phe Asp Val 9 5 SEQ ID NO: 4 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 11 TOPOLOGY: Linear MOLECULE TYPE: Peptide Arg Ala Ser Gin Thr He Gly Thr Ser He His 11 5 10 SEQ ID NO: 5 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 7 TOPOLOGY: Linear MOLECULE TYPE: Peptide Tyr Ala Ser Glu Ser He Ser 7 5 SEQ ID NO: 6 SEQUENCE LENGTH: 9 SEQUENCE TYPE: Amino acid TOPOLOGY: Linear MOLECULE TYPE: Peptide Gin Gin Ser Ser Ser Trp Pro Leu Thr 9 5 SEQ ID NO: 7 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 4 TOPOLOGY: Linear MOLECULE TYPE: Peptide Phe Asn He Lys 4 SEQ ID NO: 8 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 118 TOPOLOGY: Linear MOLECULE TYPE: Peptide Glu Val His Leu Val Gin Ser Gly Ala Glu Val Lys Lys Pro Gly 5 10 15 Ser Ser Val Lys Val Ser Cys Lys Ala Ser Gly Phe Asn He Lys 20 25 30 Asp Thr Tyr Met His Trp Val Arg Gin Ala Pro Gly Gin Gly Leu 35 40 45 Glu Trp Met Gly Arg He Asn Pro Thr Asn Gly Asn Thr Lys Tyr 50 55 60 Asp Pro Lys Phe Gin Gly Arg Val Thr He Thr Ala Asp Glu Ser 65 70 75 Thr Asn Thr Ala Tyr Met Glu Leu Arg Ser Leu Arg Ser Asp Asp 80 85 90 Thr Ala Met Tyr Tyr Cys Ala Arg Arg Gly Asp Ala Met Tyr Phe 95 100 105 Asp Val Trp Gly Gin Gly Thr Leu Val Thr Val Ser Ser 118 110 115 SEQ ID NO: 9 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 107 TOPOLOGY: Linear MOLECULE TYPE: Peptide Glu He Val Leu Thr Gin Ser Pro Gly Thr Leu Ser Leu Ser Pro 5 10 15 Gly Glu Arg Ala Thr Leu Ser Cys Arg Ala Ser Gin Thr He Gly 20 25 30 Thr Ser He His Trp Tyr Gin Gin Arg Pro Gly Gin Ala Pro Arg 35 40 45 Leu Leu He Lys Tyr Ala Ser Glu Ser He Ser Gly He Pro Asp 50 55 60 Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr He 65 70 75 Ser Arg Leu Glu Pro Glu Asp Phe Ala Val Tyr Tyr Cys Gin Gin 80 85 90 Ser Ser Ser Trp Pro Leu Thr Phe Gly Gin Gly Thr Lys Val Glu 95 100 105 He Lys 107 SEQ ID NO: 10 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 22 base pairs MOLECULE TYPE: Synthetic DNA AGGTCAAACT GCAGCAGTCA GG 22 SEQ ID NO: 11 TYPE: Nucleic acid SEQUENCE LENGTH: 22 base pairs MOLECULE TYPE: Synthetic DNA AGGTGCAGCT TCTCGAGTCT GG 22 SEQ ID NO: 12 TYPE: Nucleic acid SEQUENCE LENGTH: 20 MOLECULE TYPE: Synthetic DNA ACGGTGACCG TGGCGCCTTG 20 SEQ ID NO: 13 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 20 MOLECULE TYPE: Synthetic DNA ACGGTGACCG AGGAGCCTTG 20 SEQ ID NO: 14 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 16 MOLECULE TYPE: Synthetic DNA GCTGACACAG TCTCCA 16 SEQ ID NO: 15 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 16 MOLECULE TYPE: Synthetic DNA GATCACCCAG ACTCCA 16 SEQ ID NO: 16 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 15 MOLECULE TYPE: Synthetic DNA CTCCAGCTTG GTCCC 15 SEQ ID NO: 17 SEQUENCE TYPE: Amino acid SEQUENCE LENGTH: 20 TOPOLOGY: Linear MOLECULE TYPE: Peptide Glu Val Gin Leu Gin Gin Ser Gly Ala Glu Leu Val Lys Ser Gly 5 10 15 Ala Ser Val Lys Leu 20 20 SEQ ID NO : 18 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 24 MOLECULE TYPE: Synthetic DNA AACATTAAAG ACACCTATAT GCAC 24 SEQ ID NO: 19 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA CAGTCAGACC ATTGGCACAA GCATACAC 28 SEQ ID NO: 20 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 24 MOLECULE TYPE: Synthetic DNA AGGGAAATAG CCCTTGACCA GGCA 24 SEQ ID NO: 21 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 24 MOLECULE TYPE: Synthetic DNA GACATTGATG TCTTTGGGGT AGAA 24 SEQ ID NO: 22 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA GATTAATTCT TCCTATCCAC TCCAGGCC 28 SEQ ID NO: 23 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA GCTGTAATAG TGGCCTTGCC CTGGAACT 28 SEQ ID NO: 24 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA GACCAGGGTG CCTGCGCCCC AGACATCG 28 SEQ ID NO: 25 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA ACTGAGTCAG GAGGATGTCC CCGTAGGC 28 SEQ ID NO: 26 SEQUENCE TYPE: Nucleic acid SEQUENCE LENGTH: 28 MOLECULE TYPE: Synthetic DNA CTCAGAAGCA TATTTTATGA GAAGCCTT 28

Claims: CLAIMS 1. A humanized antibody having a specific binding activity to human IL-2 receptor and comprising a variable region including complementarity-determining regions (CDR) and partial frameworks, their amino acid sequences being as follows: H chain V region CDR1: SEQ ID No. 1 CDR2: SEQ ID No. 2 CDR3: SEQ ID No. 3 L chain V region CDR1: SEQ ID No. 4 CDR2: SEQ ID No. 5 CDR3: SEQ ID No. 6 H chain V region 27th-30th amino acids: SEQ ID No. 7 94th amino acid: Arg L chain V region 49th amino acid: Lys 2. A humanized antibody according to claim 1, wherein the variable region has the following amino acid sequence: H chain V region: SEQ ID No. 8 L chain V region: SEQ ID No. 9 3. A humanized antibody according to claim 1 or 2, which comprises a matured antibody molecule, (Fab') 2 >, Fab or Fv. 4. A humanized antibody according to claim 1, 2 or 3, which is bound with a functional molecule. 5. A process for producing a humanized antibody, which comprises preparing a plasmid expressing a humanized antibody according to claim 1, 2, 3 or 4, introducing the plasmid into a host cell, obtaining astable transformant cell and cultivating the resulting cell producing the humanized antibody. 6. A process according to claim 5, wherein the host cell is an animal or human cell. 7. A medicine in a dosage form for parenteral administration, which comprises as an essential component a humanized antibody*according to claim 1,2,3 or 4.

Inventors: GOMI HIDEYUKI, NAKATANI TOMOYUKI, NOGUCHI HIROSHI, WIJDENES JOHN, GOMI, HIDEYUKI, NAKATANI, TOMOYUKI, NOGUCHI, HIROSHI, WIJDENES, JOHN
Applicants: BIOTEST PHARMA GMBH, INNOTHERAPIE LAB SA, SUMITOMO PHARMA, INNOTHERAPIE LABORTOIRES, SUMITOMO PHARMACEUTICALS COMPANY, LIMITED
Application year: 1992
Main classification: C12P21
IPC codes: A61K38, A61K39, A61P35, C07K16, C12N5, C12N15, C12P21, G01N33