bluuebunny/crossref_metadata_2025_split huggingface dataset:
THE IMMUNE RESPONSE TO SHEEP ERYTHROCYTES IN THE MOUSE
Authors: Eidinger David , Pross Hugh F. 
Published: June 2004

The direct and indirect plaque technique for the detection of antibody-forming cells against sheep erythrocytes was utilized for the investigation of a number of biological parameters of the primary and secondary immune response on a cellular level.
The sequential pattern of 19S followed by 7S antibody formation was elicited in the primary response after a latent period of at least 1–2 days and 2–3 days respectively. The secondary response initiated 140 days after primary immunization, in contrast, was characterized by the simultaneous appearance of 19S and 7S antibody-forming cells after an observed latent period of 2–3 days.
The cellular dynamics of the recruitment phase of the respective immunoglobulins in the primary and secondary response was interpreted as evidence for the derivation of the two classes of immunoglobulins from separate progenitors. The 19S antibody-forming cells were derived predominantly by a process of transformation and maturation and 7S antibody formers by a process of cellular division with a doubling time of about 12 hr.
The draining lymph node exhibited maximal immunological reactivity due to its capacity to retain the particulate antigen. This capacity was considerably enhanced in the sensitized draining lymph node. Minimal cellular activity was also noted in distal lymphoid tissues which included the thymus.
Focal cellular activity was observed in the draining lymph node for 60 days after immunization. Subsequently, very low level plaque-forming cellular activity was observed in association with persistence of maximal antibody activity. The appearance at 120 days of a generalized peak of cellular activity in lymphoid tissues throughout the host was considered an explanation for this discrepancy.
The change in distribution of cellular antibody-forming activity, from a local to a generalized lymphatic response during the late phase of the immune response, implied a fundamental alteration in homeostatic mechanisms associated with maintenance of immune reactivity. Further manifestations of such an alteration were indicated by the appearance of 2-ME-sensitive 7S antibody nearly 3 months after primary intradermal immunization, which in the ensuing 5 months was associated with, and inversely related to, two major fluctuations in 2-ME-resistant 7S antibody.
Evidence for the existence of immunological memory in the 19S system was not established in the present work. 19S anamnesis, for which evidence was derived from measurements of circulating antibody levels, was interpreted from cellular studies as the result of the substantial activity of previously uncommitted 19S lymphoid cells in distal lymphoid tissue associated with previously committed 19S cells contained in the draining lymph node.
BENIGN AND MALIGNANT HYPERTENSION AFTER ADRENAL ENUCLEATION IN THE RAT
Authors: Hall C. E. , Holland O. B. , Hall O. 
Published: June 2004

Adrenal-enucleated, mononephrectomized rats given a high salt diet rapidly develop malignant hypertension, characterized by the presence of necrotizing vascular lesions in a number of organs and tissues. If a normal salt intake is provided, or if hydrochlorothiazide is given together with a high salt diet, there is, instead, the delayed onset of benign hypertension which either stabilizes or increases in intensity extremely slowly; Such animals display few, if any, pathologic vascular changes other than occasional focal glomerular hyalinization, show insignificant cardiac enlargement, and do not exhibit alterations in the serum sodium or potassium. Occasional animals behave atypically and develop malignant hypertension despite normal salt consumption, demonstrating that in susceptible rats excess salt is not essential to this disorder. Hydrochlorothiazide given to rats that imbibed distilled water postoperatively prevented hypertension entirely for 97 days, when one of eight rats developed mild hypertension and some others reached what is regarded as a prehypertensive range.
It is concluded that adrenal regeneration provides a physiological milieu favorable to the development of benign hypertension, which is not, as a rule, manifest until regeneration is complete. Salt excess converts the response into one in which malignant hypertension begins during regeneration and worsens rapidly thereafter until death. The course and findings are compared with those of the benign and malignant phases of clinical essential hypertension, and the implications of the similarities are discussed.
AN ULTRASTRUCTURAL STUDY OF THE MECHANISMS OF PLATELET-ENDOTOXIN INTERACTION
Authors: Spielvogel Arthur R. 
Published: June 2004

Electron microscopy has confirmed previous studies and has provided much new information on the mechanism of endotoxin-platelet interaction. The Boivin lipopolysaccharide preparation is particulate, and on electron microscope examination appears as a three-layered structure, morphologically similar to bacterial cell wall.
In vitro and in vivo experiments have demonstrated that these endotoxin particles adhere to platelets. In some species, particularly the rabbit, this is associated with loss of platelet contents, due to lysosomal and cell membrane lysis, resulting in platelet sphering and apparent cell death. Serial observation of degranulating platelets and metabolic studies indicate that although some platelet engulfment of endotoxin occurs, degranulation is not dependent upon phagocytosis.
Several observations suggest that these endotoxin effects are mediated through immune mechanisms: (1) Inactivation of complement in the suspending plasma by heating to 56°C, anticoagulation with EDTA, a reaction temperature of 5°C, ammonium hydroxide incubation, and adsorption with either zymosan or washed antigen-antibody complexes, inhibits both endotoxin adherence and platelet degranulation. (2) The reaction requires a plasma cofactor, possibly antibody, which can be adsorbed out by endotoxin. (3) Endotoxin adheres selectively to nonprimate platelets and primate red cells, a pattern conforming to immune adherence, a phenomenon requiring antigen, antibody, and complement.
It is suggested that endotoxin-induced platelet damage is dependent upon the intimate contact provided by immune adherence. We have not established whether degranulation is an endotoxin or complement effect. The species variation in susceptibility to endotoxin also merits further investigation.
THE SEROLOGIC SPECIFICITY OF TROPOCOLLAGEN TELOPEPTIDES
Authors: Davison Peter F. , Levine Lawrence , Drake Maurice P. , Rubin Albert , Bump Susan 
Published: June 2004

Tropocollagen preparations from carp, buffalo fish, rats, calves, sheep, and humans have been studied by electron microscopy and serologic methods. Tropocollagens from each species appeared identical by electron microscopy but they were readily distinguished (except between sheep and calves) by C'-fixation tests with rabbit antisera against the various tropocollagens. Tests with calf tropocollagen antiserum showed no distinction between tropocollagen isolated from different tissues nor between individuals of the same or different strains.
The major immunogenic sites in native tropocollagen are the telopeptides, and these are present on both α1- and α2-chains. The C'-fixing activity was lost with heat denaturation of the tropocollagen, but could be recovered in a concentration-dependent process on cooling.
The fact that pure and enzyme-treated collagen can provoke serologic reaction implies that collagenous sutures and prostheses used in surgery may lead to sensitization and rejection, a fact which may merit clinical concern.
CUTANEOUS HYPERSENSITIVITY REACTIONS TO CELLULAR ISOANTIGENS IN RATS
Authors: Streilein J. W. , Billingham R. E. 
Published: June 2004

Rats have been shown to be capable of displaying the various kinds of delayed cutaneous hypersensitivity reactions attributable to transplantation immunity previously described in guinea pigs, hamsters, rabbits, dogs, and man. The rat is unlike most other species in that much larger numbers of lymphoid cells are needed to incite these cutaneous reactions.
With direct, transfer, or normal lymphocyte transfer reactions, the cutaneous responses were greater when donor and recipient differed at the Ag-B histocompatibility locus than when donor and recipient shared the same Ag-B alleles.
An experiment was performed in which adult rats of a genetically defined backcross population, resulting from matings between DA and (DA x Lewis) F1 hybrid rats, were inoculated intradermally with lymph node cells from DA rats sensitized against tissues from Lewis-strain donors. Some of the R2 animals gave a biphasic transfer reaction with peak reactivities occurring first at 48 hr and recurring at 96–120 hr, while the others lacked this second component. Hemagglutination tests revealed that the R2 rats giving the biphasic response possessed the Ag-B,1 antigen, which is also present in Lewis rats, whereas rats which gave monophasic reactions were homozygous for the Ag-B,4 antigenic determinant which is present in the DA strain. This suggested that the recall flare at 96–120 hr reflects proliferative activity on the part of the inoculated cells confronted by the disparate Ag-B isoantigen in the host's dermis. Skin homografts from R1 animals bearing the Ag-B,1 antigen were uniformly rejected by DA hosts in 11 days or less, while grafts from backcross animals homozygous for the Ag-B,4 antigen usually lived longer, being rejected in 9 to 27 days.
Evidence is also presented which suggests that specific isoantibodies may act synergistically with immune lymphocytes to bring about cutaneous inflammatory reactions in the rat.
STREPTOCOCCAL NUCLEASES
Authors: Wannamaker Lewis W. , Yasmineh Walid 
Published: June 2004

Streptococcal DNAse C is more resistant to heat inactivation than the A or B enzyme. DNAses A and C are indifferent to the bacterial ribonucleic acid inhibitor whereas the B enzyme is markedly inhibited. Prolonged digestion with relatively large amounts of DNAse B results in chemical and biological destruction of the inhibitor.
Ribonuclease as well as deoxyribonuclease activity is associated with the B enzyme. Both activities require divalent cations and both are inhibited by bacterial ribonucleic acid. The ratios of the two activities are constant in various preparations and after partial heat inactivation. Mutual inhibition of the two activities can be demonstrated in mixed substrate systems. The evidence presented is consistent with the view that the B enzyme is a single nuclease which can attack both deoxyribonucleic and ribonucleic acids.
RENAL HOMOTRANSPLANTATION IN RATS
Authors: Feldman Joseph D. , Lee Sun 
Published: June 2004

Within 3–6 hr after the reestablishment of the circulation, a characteristic pathology developed in renal homotransplants. Blood monocytes and lymphocytes adhered to large thin-walled vessels of the septa carrying interlobular arteries, traversed their walls, and aggregated in the connective tissue spaces around them. Within 3 days, the number and size of the extravascular cells markedly increased, filling the septa completely and spreading from them centrifugally to occupy the intertubular spaces throughout the cortex. The composition of these aggregates at first was a mixture of lymphocytes and monocytes, and later consisted of large blast cells, macrophages, a few plasma cells, and polymorphonuclear leukocytes. Mitotic activity was seen 2 days after surgery among the large blast cells and increased to a maximal level a day later. Coevally with these changes, the thin-walled septal vessels, intertubular veins and capillaries, and finally, arteries and arterioles, in that order, were damaged. Focal injury of tubules was slight 24 hr after homografting; widespread cortical necrosis had developed 5–7 days later. At no time up to 7 days were concentrations of immunoglobulins detected by fluorescence microscopy in the transplanted kidneys.
The morphologic manifestations and temporal sequences of renal homograft destruction suggested that several mechanisms acted synergistically to eliminate the transplant. The initial injury appeared to be the result of an interaction between host lymphoid cells and target endothelium, a phenomenon akin to allogeneic inhibition; followed by spreading ischemia; additional contact injury to tubules; and nonspecific inflammation associated with necrobiotic tissue.
FACTORS INFLUENCING HEMATOPOIETIC SPLEEN COLONY FORMATION IN IRRADIATED MICE
Authors: Boggs Dane R. , Marsh John C. , Chervenick Paul A. , Bishop Carter R. , Cartwright George E. , Wintrobe Maxwell M. 
Published: June 2004

Normal dog plasma and serum, human, rat, and Swiss-Webster mouse plasma, phytohemagglutinin, sheep red cells, mumps and influenza vaccine, fibrinogen, and endotoxin injected before irradiation led to an increased number of endogenously derived spleen colonies in irradiated mice. Spleen weight and uptake of radioactive iron and iododeoxyuridine into such spleens were also increased. The relationship between these parameters of splenic hematopoiesis was unchanged by plasma injection suggesting that, while the number of colonies was increased, the composition of individual colonies was unchanged. This conclusion was supported by studies on plethoric mice in which splenic erythropoiesis is abolished. Increased splenic hematopoiesis was accompanied by an increase in the volume of packed red blood cells 10 days after irradiation.
The total volume of plasma injected, the number of days of plasma injection preceding irradiation, and the route of administration were all important variables influencing the effect of plasma injections.
Crude fractions of human albumin and gamma globulin, cortisol, C57BL (maternal) and DBA (paternal) mouse plasma, and isogeneic plasma were without effect. The ineffectiveness of isogeneic and closely related allogeneic plasma rendered unlikely the hypothesis that this effect represented the presence of homeostatic hematopoietic regulating factors in plasma.
The increased hematopoiesis induced with plasma appeared to be limited to the spleen, for increased bone marrow hematopoiesis was not detected.
Certain observations suggested that the effect of plasma may not be due to an antigenic or an inflammatory effect. From current observations, it was unclear whether the increased colonies induced by plasma were representative of expansion of the colony-forming cell pool or of increased efficiency of growth of the fraction surviving irradiation.
GENETIC CONTROL OF THE ANTIBODY RESPONSE
Authors: McDevitt Hugh O. , Sela Michael 
Published: June 2004

CBA and C57 mice were tested for their ability to make an immune response to a related series of branched, multichain synthetic polypeptide antigens in which the antigenic determinants on the amino termini of the branched side chains were systematically varied. Neither strain responded to the polyglutamic acid determinant. Both strains responded well and equally to the poly(phenylalanine, glutamic acid) determinants. CBA mice responded poorly, and C57 mice responded well to two different antigens bearing poly(tyrosine, glutamic acid) determinants. CBA mice responded well, and CS7 mice responded poorly to two different antigens bearing poly(histidine, glutamic acid) determinants.
The genetic control of the immune response to (H,G)-A--L appears to be dominant and polygenic, as it has been shown to be for (T,G)-A--L.
The related antigens used in this study show extensive cross-reactions with antisera against other members of the related series.
STUDIES ON THE MODE OF ACTION OF DIPHTHERIA TOXIN
Authors: Bonventre Peter F. , Imhoff John G. 
Published: June 2004

Primary heart cell cultures of embryonic guinea pigs and the neonatal rat were established and incubated with purified diphtheria toxin. The rat heart cell cultures were refractory to the effects of the toxin; protein synthesis proceeded normally as measured by the incorporation of tritiated leucine into cell proteins; beating heart cells continued to contract; and the cell monolayers remained intact after exposure to the toxin for periods as long as 72 hr. These findings are compatible with the species resistance of the rat to diphtheria toxin. The guinea pig heart cell cultures were found to be extremely sensitive to the toxin. Protein synthesis was inhibited by approximately 50% after incubation with small quantities of toxin for 3 hr. Increasing the concentration of the length of exposure to the toxin did not increase this inhibition significantly. In addition, diphtheria toxin exerted a true cytopathic effect on the guinea pig heart cells. Monolayers were destroyed when incubated with the toxin for 2 to 3 days.
The results show that the heart cells reflect species resistance or sensitivity to diphtheria toxin in the absence of neural or endocrine influences and suggest further that the toxin exerts a direct toxicity to muscle cells of the heart. It is not yet possible to explain in biochemical terms why the toxin seems to act specifically on cardiac tissues.
IMMUNOGLOBULINS IN NZB/BL MICE
Authors: Warner Noel L. , Wistar Richard 
Published: June 2004

Determination of serum immunoglobulin levels in NZB and normal mice has indicated that an elevation of the γM-globulin level occurs in NZB mice. This can be demonstrated in young NZB mice well before other autoimmune manifestations are observed. A slight elevation of γM-globulin was also observed in NZB hybrid mice.
Erythrocyte autoantibodies were analyzed by the direct Coombs' test with specific antiimmunoglobulin reagents. Autoantibodies in NZB mice can be of all immunoglobulin classes, although predominantly of γG1-class. In (NZB x NZC)F1 hybrid mice, although Coombs' positivity develops around the same age as in NZB mice, there is a greater restriction of the autoantibodies into γM- and γG1-classes.
Preliminary attempts to quantitate immunoglobulins coating NZB red cells have shown that there are approximately 400 molecules of γM and 5000 molecules of γG-globulin per NZB mouse red cell.
IMMUNOLOGICAL ANALYSIS OF RABBIT ANTI-ANTIBODY SYSTEMS
Authors: Kelus Andrew S. , Cell Philip G. H. 
Published: June 2004

A study has been made of the production of antiidiotypic antibodies (anti-antibodies) arising during the immunization of 39 rabbits with 19 individual samples of rabbit anti-Proteus vulgaris x 19 antibodies adsorbed onto bacilli. In addition to the regular demonstration of antiidiotypic antibodies attention is drawn to the frequent occurrence of antiallotypic antibodies against molecules of immunoglobulin classes other than IgG, especially macroglobulins, which may arise during such immunization. In four cases attempts to raise autoantiidiotypic antibodies were unsuccessful, as expected.
The idiotypic specificities (antigenic determinants) have been found mainly on IgG but also sometimes on IgM molecules. The individual specificity of the antiidiotypic antibodies appears to be absolute, as long as the antiallotypic antibodies are recognized and excluded; e.g., each idiotypic specificity is characteristic of only one single rabbit and of a single kind of antibody within that rabbit. These principles hold even when antibodies of rabbit families are examined: the parental idiotypic determinants could not be found in the offspring.
In two samples tested the idiotypic specificities were found on the Fab fragment of IgG molecule but not on its antibody-combining site.
HAPTEN CARRIER RELATIONSHIPS IN THE DNP-PLL·FOREIGN ALBUMIN COMPLEX SYSTEM: INDUCTION OF TOLERANCE AND STIMULATION OF CELLS IN VITRO
Authors: Green Ira , Paul William E. , Benacerraf Baruj 
Published: June 2004

Genetic nonresponder guinea pigs made tolerant to BSA and then immunized with DNP-PLL·BSA failed to make anti-DNP-PLL antibodies. Thus, tolerance to a carrier protein renders animals unresponsive to the hapten which it bears.
The addition in vitro of DNP-PLL or DNP-GL to lymph node cell cultures derived from genetic responder animals immunized with these materials led to a significant stimulation of 3H-thymidine incorporation into DNA. However, the addition of DNP-PLL or DNP-GL to lymph node cell cultures from nonresponder animals immunized with these materials failed to produce any stimulation of DNA synthesis. Furthermore, the addition of DNP-PLL to lymph node cell cultures from nonresponder animals immunized with DNP-PLL·BSA or DNP-PLL·OVA also failed to stimulate cell proliferation in spite of the fact that the lymph node cells of these animals were producing anti-DNP-PLL antibodies.
The above facts suggest that the function of the PLL gene product is to act at an early crucial step in the immune mechanism to form an antigen-inducer complex. The specificity of this early step may be of a simple order and different than that of the antibody which is later produced in the immune response.
STUDIES ON THE CONTROL OF ANTIBODY SYNTHESIS
Authors: Siskind Gregory W. , Dunn Philip , Walker J. Geoffrey 
Published: June 2004

The effect of antigen dose on the kinetics of circulating antibody synthesis and on antibody affinity was studied in a haptenic system. High doses of antigen resulted, early in immunization, in higher concentrations of antibody followed later in the immune response by decreased serum levels of antibody as compared with lower doses of antigen. The affinity of the initial antibody synthesized was very similar over a wide antigen dose range. Subsequently, however, a rapid rise in affinity was seen in animals immunized with low doses of antigen, while relatively little change in affinity was seen in animals immunized with higher antigen doses. Suppression of active antibody formation by passive antiserum led to an increase in antibody affinity.
The results are discussed in terms of the mechanisms involved in the selection of a population of cells to participate in the immune response and the mechanisms whereby antigen dose and circulating antibody function to control antibody synthesis.
MECHANISMS OF ACTIVATION OF C'1 ESTERASE IN HEREDITARY ANGIONEUROTIC EDEMA PLASMA IN VITRO
Authors: Donaldson Virginia H. 
Published: June 2004

The generation of C'1 esterase activity in siliconed plasma obtained from individuals with hereditary angioneurotic edema in remission tends to occur spontaneously, but can be hastened during its incubation with preparations of activated Hageman factor. This effect of activated Hageman factor could not be shown during its incubation with normal siliconed plasma, nor could consumption of normal serum inhibition of C'1 esterase be clearly shown.
Soy bean trypsin inhibitor and heparin could impair this enhanced generation of C'1 esterase but neither inhibits the esterolytic function of C'1 esterase once formed. Trasylol was less effective in blocking this effect of activated Hageman factor.
While the mechanism of the effect of activated Hageman factor upon C'1 activation remains obscure, it is apparent that some intermediate steps, possibly involving a kinin-forming system of plasma, may play a role.
STUDIES ON STREPTOCOCCAL BACTERIOPHAGES
Authors: Fischetti Vincent A. , Zabriskie John B. 
Published: June 2004

Evidence has been presented that Group C bacteriophages differ as to their inactivating site on the streptococcal cell wall. While all three phages adsorb to isolated cell walls, only the C1 phage was inactivated by enzymatically prepared group-specific carbohydrate. None of the Group C phages were inactivated by chemically extracted group-specific carbohydrate. In contrast, all virulent Group A streptococcal bacteriophages adsorbed only to living Group A streptococci. However, Group A temperate phages were able to adsorb to isolated cell walls but not to group-specific carbohydrate.
While it has not been possible to identify the specific inactivating substance for the Group A virulent phages, certain pieces of evidence indirectly implicate the group-specific carbohydrate, specifically the N-acetylglucosamine moiety. The fact that Group A virulent phages failed to adsorb to heat-killed Group A streptococcal cells suggests that additional factors produced by the living cell are needed for complete viral inactivation.