bluuebunny/crossref_metadata_2025_split huggingface dataset:
EAE in rat bone marrow chimeras: analysis of the cellular mechanism of BN resistance.
Authors: Singer D E , Moore M J , Williams R M 
Published: December 2022

Abstract
Unlike Lewis strain, BN rats do not develop EAE when given 10 microgram GPBP + CFA. Their resistance is mediated via the MHC-linked gene Ir-EAE-. The cellular mechanism of BN resistance can be probed using bone marrow chimeras between susceptible LBNF1 strain and BN. F1 leads to BN chimeras can develop EAE when actively sensitized with GPBP + CFA, but are markedly more resistant than F1 leads to F1. By contrast, F1 leads to BN chimeras are highly susceptible to passively transferred EAE from an F1 donor. F1 rats reconstituted with BN bone marrow, i.e., BN leads to F1 chimeras, are completely resistant to EAE induced by active sensitization, but they too are susceptible to passively transferred EAE. We argue that Ir-EAE- blocks the development of T cells reactive to self myelin, and that this occurs at the level of macrophage presentation of antigen to the T cell. Suppressor mechanisms do not appear to play a major role.
Recognition of protozoan parasites by murine T lymphocytes. II. Role of the H-2 gene complex in interactions between antigen-presenting macrophages and Leishmania-immune T lymphocytes.
Authors: Louis J A , Moedder E , MacDonald H R , Engers H D 
Published: December 2022

Abstract
The proliferative response of nylon wool purified, primed lymph node cells to L. tropica parasites in vitro was found to be restored by the addition of either syngeneic or allogeneic adherent spleen cells as a putative source of macrophages. These results suggested a lack of H-2 restriction in Leishmania-specific T cell responses. However, when T cell blasts generated in vitro in response to the parasite were separated on Percoll density gradients and subsequently maintained for 4 days in the presence of TCGF, their response to L. tropica was found to be strictly dependent on the presence of syngeneic spleen cells. Further studies using congenic recombinant mice demonstrated that proliferation of a parasite-specific blasts required the presence of spleen cells compatible with the responding cells in the I-A region of the MHC. This requirement for I-A compatible adherent cells in the spleen cell populations was further confirmed by a lack of proliferative responses in the presence of spleen cells treated with monoclonal anti-la antibodies and complement. Leishmania-immune F1 blasts responding to the parasite in the context of either parental la-bearing accessory cell could be obtained by positive selection from a F1 hybrid responding cell population. Using flow microfluorometry, the T cell phenotype of the L. tropica-specific blasts was determined to be Thy-1+, lyt-1+, and Lyt-2-.
Direct in vitro evidence for different susceptibilities to 4-hydroperoxycyclophosphamide of antigen-primed T cells regulating humoral and cell-mediated immune responses to sheep erythrocytes: a possible explanation for the inverse action of cyclophosphamide on humoral and cell-mediated immune responses.
Authors: Diamantstein T , Klos M , Hahn H , Kaufmann S H 
Published: December 2022

Abstract
Suppressor T cells of humoral immune responses, effector T cells mediating DTH, suppressor T cells of DTH, and helper T cells of humoral immune responses, all with specificity to SRBC, were produced in mice. The biologic activity was tested in adoptive transfer experiments. In vitro treatment with different doses of 4-hydroperoxycyclophosphamide (4-HPCy) yielded the result that the various activities tested were not uniformly sensitive to the action of this drug: Suppressor T cells of humoral immune responses and effector T cells mediating DTH were resistant to doses of 4-HPCy that eliminated the activities of suppressor T cells of DTH and helper cells of the humoral immune response. These findings help to explain the various effects cyclophosphamide has on the in vivo immune response and may help to form a basis for the rational manipulation of the immune response by drugs that selectively affect different subgroups of immune cells.
Developmental changes in humoral suppressor activity released from concanavalin A-stimulated human lymphocytes on B cell differentiation.
Authors: Miyawaki T , Kubo M , Nagaoki T , Moriya N , Yokoi T , Mukai M , Taniguchi N 
Published: December 2022

Abstract
Cell-free culture supernatants (Con A-activated supernatants) were obtained by incubating peripheral blood lymphocytes (PBL) from cord blood, healthy children of various ages, and healthy adults with mitogenic doses of concanavalin A (Con A) for 48 hr. It is well known that human T lymphocytes are activated by Con A to manifest suppressor function in vitro. One mechanism whereby these suppressor cells act has been shown to be by the secretion of a soluble suppressor factor. The present study has investigated the Con A-inducible suppressor cell function in cord blood, children of various ages, and adults by comparing the ability of each Con A-activated supernatant to inhibit the generation of immunoglobulin-producing cells (Ig-PC) in pokeweed mitogen- (PWM) stimulated cultures of adult PBL. Con A-activated supernatants from adults could markedly suppress the generation of Ig-PC by allogeneic as well as autologous PBL in response to PWM. Such suppression appeared to be equally effective on the generation of IG-PC of 3 major classes, IgG, IgM, and IgA. On the contrary, Con A-activated supernatants from cord blood and newborn infants showed only a negligible suppression on PWM-induced adult B cell differentiation. But the suppressor activity found in Con A-activated supernatants gradually increased with advancing age, and reached approximately to the adult level at 4 yr of age or later. The results suggest that human T lymphocytes may be relatively deficient in their Con A-induced suppressor cell function in the early period of life.
Inhibition of complement-mediated functions of human neutrophils by impermeant stilbene disulfonic acids.
Authors: Tauber A I , Goetzl E J 
Published: December 2022

Abstract
The impermeant labeling reagents 4,4'-diisothiocyanostilbene-2-2'-disulfonic acid (DIDS) and 4-acetamido-4'-isothiocyano-2,2'-disulfonic acid (SITS) inhibited in a concentration-related manner the enhanced generation of superoxide radicals (O2) by human neutrophils engaged in the phagocytosis of zymosan that had been opsonized in fresh serum, without altering the O2 generation by neutrophils exposed to zymosan opsonized in heat-decomplemented serum or to phorbol myristate acetate (PMA). That the stimulus specificity of the suppression of O2 generation by SITS and DIDS is predominantly attributable to an action on neutrophil plasma membrane receptors for complement was suggested by the similarity of the concentration dependence of the inhibition of the expression of neutrophil C3b receptors, as assessed by a rosetting assay. Washing neutrophils that had been pretreated with the covalent label DIDS failed to reverse either the suppression of C3b-dependent rosetting or the inhibition of O2 generation stimulated by opsonized zymosan. In contrast, pretreatment with DIDS and washing or erythrocytes bearing C3b and of opsonized zymosan did not inhibit their capacity to form rosettes and to stimulate O2 generation by neutrophils, respectively. In the same rosetting assay, the expression of IgG-Fc receptors was unaffected by SITS and DIDS. The rapid and apparently selective inhibition of the expression of neutrophil C3b receptors by noncytotoxic concentrations of the impermeant stilbene disulfonic acids may provide a means to analyze the complement dependence of other neutrophil effector functions.
Human B lymphocytes activated by Epstein-Barr virus (EBV) or by mitogens suppress mitogen-induced immunoglobulin production.
Authors: Tsukuda K , Berczi I , Klein G 
Published: December 2022

Abstract
Polyclonal activation of human B lymphocytes by LPS or protein A, alone or in combination or by Epstein-Barr virus (EBV), generates suppressive conditions that inhibit the response of human B lymphocytes to pokeweed mitogen (PWM), measured by the induction of immunoglobulin-secreting cells (PFC). Moreover, EBV-transformed B cell lines of normal or neoplastic (Burkitt lymphoma) origin also suppressed the PWM-induced immunoglobulin production of normal B cells. Cell separation experiments have shown that mitogen activated autologous B cells stimulate suppressor T cells in a similar way as B cell-derived lymphoblastoid cell lines. The significance of this phenomenon is considered in relation to the escape of the activating microorganism or virus from immune control and the occurrence of network interactions within the immune system.
Regulation of paralytic experimental allergic encephalomyelitis in rats: susceptibility to active and passive disease reinduction.
Authors: Hinrichs D J , Roberts C M , Waxman F J 
Published: December 2022

Abstract
Spleen cells obtained from Lewis inbred rats previously immunized with 50 microgram of guinea pig basic protein emulsified in complete Freund's adjuvant passively transferred paralytic experimental allergic encephalomyelitis (EAE) only following an in vitro conditioning period. The in vitro conditioning required the presence of either concanavalin A or encephalitogenic antigen. The conditioned cells caused passive paralytic EAE in recipients of 10 million viable cells. After recovery from passive paralytic EAE, animals were completely susceptible to additional attempts to induce EAE by active or passive means. Active EAE recovered rats were resistant to additional attempts to induce active EAE but were fully susceptible to passively induced EAE mediated by in vitro conditioned cells.
Immunosuppressive effect of mouse serum lipoproteins. I. In vitro studies.
Authors: Hsu K H , Ghanta V K , Hiramoto R N 
Published: December 2022

Abstract
Three classes of lipoproteins, very low, low, and high density, were isolated from normal mouse sera and characterized with respect to electrophoretic mobility, content, and composition. All 3 classes of mouse serum lipoproteins migrated into the alpha region at different rates and were composed of more phospholipid and less triglyceride and cholesterol than lipoproteins from man. High density lipoprotein (HDL) was the major lipoprotein, carrying 70% of the serum cholesterol and phospholipid and 85% of the total lipoprotein. Whole mouse serum and all classes of mouse serum lipoproteins inhibited lymphocyte proliferation stimulated by mitogens. No strain specificity was observed. HDL contributed about 73% of the total inhibitory activity. The effect of apoprotein and the lipid portion of very low, low, and high density lipoproteins were also studied.
Alkaline phosphatase in hematopoietic tumor cell lines of the mouse: high activity in cells of the B lymphoid lineage.
Authors: Culvenor J G , Harris A W , Mandel T E , Whitelaw A , Ferber E 
Published: December 2022

Abstract
Alkaline phosphatase (EC 3.1.3.1) was assayed in a large number of cultured mouse tumor cell line using p-nitrophenylphosphate as the substrate. Of 19 lines of the B lymphoid lineage, including Abelson pre-B, B lymphoma, and plasma cell tumor lines, all but 1 had substantial activity averaging 407 nmol/min/mg protein (with a range from 5 to 900). Nine T lymphoid and 9 nonlymphoid hematopoietic lines examined had low activity of 0.7 to 4.2 nmol/min/mg protein. The enzyme was markedly enriched in plasma membrane preparations from the B lymphoid cells, but not in those from most T lymphoma cells. The activity of another plasma-membrane-bound enzyme, gamma-glutamyl transferase, did not vary systematically with the type of cell line but was exceptionally high in 1 T lymphoma line. Investigation of pH dependence and susceptibility to inhibition by L-phenylalanine and L-homoarginine indicated similarity of the alkaline phosphatase from B cell lines to the enzyme recoverable from normal mouse kidney, placenta, bone marrow, and lymphoid organs. The enzyme seems to provide a useful marker for tumor lines of the B lymphoid lineage and for their plasma membranes.
Studies on natural killer (NK) cells. I. NK cell specific antibodies in CE anti-CBA serum.
Authors: Burton R C , Winn H J 
Published: December 2022

Abstract
An antiserum prepared by injecting CE mice with CBA spleen cells has been shown to contain antibodies specifically reactive with NK cells. The serum also contains antibodies detectable in C-dependent dye exclusion tests, but in a study of (CE X CBA)F1 X CE mice reactivity in this test was found to segregate independently of sensitivity of NK cells to inactivation. Moreover, abrogation of NK activity was observed with concentrations of antiserum and C that were considerably lower than those required for detectable cytotoxicity as measured by dye uptake. Thus, it is possible to use this antiserum for the selective removal of NK activity. Analysis of the strain distribution of NK cell sensitivity to CE anti-CBA serum suggests that this reagent may detect an allele of the NK-1 system, and we have tentatively designated the allelic product as NK-1.2, and the corresponding antibodies as anti-NK-1.2. However, the possibility that CE anti-CBA serum detects a new system of NK-specific antigen has not been excluded.
Cell-mediated immunity in interstitial nephritis. IV. Anti-tubular basement membrane antibodies can function in antibody-dependent cellular cytotoxicity reactions: observations on a nephritogenic effector mechanism acting as an informational bridge between the humoral and cellular immune response.
Authors: Nielson E G , Phillips S M 
Published: December 2022

Abstract
Anti-tubular basement membrane antibodies (alpha TBMA) were tested in vitro in an antibody-dependent cellular cytotoxicity (ADCC) reaction utilizing tubular antigen-coated targets. A selected subpopulation of normal guinea pig spleen cells induced significantly more target cell lysis in the presence of sera containing alpha TBMA than in the presence of control sera. this ADCC reaction using alpha TBMA exhibited a characteristic dose responsiveness and the alpha TBMA binding was specific for species-independent tubular antigens. The spleen effector cells used in this assay were characterized as nonadherent, non-T cells bearing Fc-receptors similar to other previously described natural killer cells found in guinea pigs. These studies suggest that natural surveillance systems may be able to use alpha TBMA as an informational bridge to tubular antigens. Such a potential nephritogenic effector mechanism has not been previously described.
Tumor cell destruction by cytotoxic T lymphocytes: the basis of reduced antitumor cell activity in syngeneic hosts.
Authors: Fishelson Z , Berke G 
Published: December 2022

Abstract
Tumor overgrowth in spite of an ongoing antitumor immune response may be due to a basic immunologic defect in T cell-mediated responses against the potentially immunogenic tumor cells. To further understand T cell-mediated responses in syngeneic tumor-host systems, we have analyzed the interaction of cytotoxic T lymphocytes (CTL) with syngeneic tumor cells and have compared it with CTL-allogeneic tumor cell interaction. The major conclusions of this study are: 1) Syngeneic and allogeneic CTL lyse target cells through a similar mechanism. 2) The reduced reactivity in the syngeneic system is due to the low content of effector cells capable of binding to and killing tumor cells. 3) The avidity of CTL-syngeneic tumor cell binding is lower than CTL-allogeneic tumor cell binding. We suggest that the latter 2 observations result from a low immunogenicity of tumor cells in the syngeneic host.
Simultaneous induction of antigen-specific IgA helper T cells and IgG suppressor T cells in the murine Peyer's patch after protein feeding.
Authors: Richman L K , Graeff A S , Yarchoan R , Strober W 
Published: December 2022

Abstract
The effects of feeding the dietary protein antigen, ovalbumin (OVA), on OVA-specific IgG and IgA immune responses involving Peyer's patches (PP) and mesenteric lymph nodes (MLN) were examined. Mice were administered soluble OVA by gastric intubation. One to 3 days later, PP, MLN, or spleen cells from these donor mice were adoptively transferred into normal syngeneic recipients. After two subsequent immunizations, spleens from the recipient mice were assayed for IgA and IgG anti-OVA plaque-forming cell (PFC) responses. None of the tissues from normal (unfed) mice had the inherent ability to alter recipients' IgG or IgA PFC responses. Within 1 day of OVA feeding, however, cells were generated in the PP that could augment recipients' IgA anti-OVA PFC responses and suppress IgG PFC responses. Three days after OVA feeding, these cells were present in MLN as well, and whereas the IgG suppressor cell also appeared to migrate to spleen, the IgA helper cell did not. The cells mediating antigen-specific IgG suppression and IgA help were both T cells but could be distinguished by surface phenotype. We therefore conclude that protein feeding induces differential, isotype-specific immunoregulation in gut-associated lymphoid tissues, part of which is mediated by an antigen-specific IgA helper T cell.
Interaction between Entamoeba histolytica and the immune system. I. Mitogenicity of Entamoeba histolytica extracts for human peripheral T lymphocytes.
Authors: Diamantstein T , Klos M , Gold D , Hahn H 
Published: December 2022

Abstract
The effect of Entamoeba histolytica extracts (E.h.e.) on proliferation in vitro of human peripheral blood lymphocytes, cord blood lymphocytes, and lymphocytes enriched for T cells or non-T cells was investigated. As tested by 3H-thymidine uptake and by morphologic criteria, E.h.e. stimulate T lymphocyte proliferation. Non-T lymphocytes do not respond to E.h.e. The response of lymphocytes to E.h.e. differed from their response to Con A in several respects, indicating either that E.h.e. and Con A act on different subsets of T cells or that E.h.e. act by different mechanism on the Con A reactive cells.
Deficiency of autologous mixed lymphocyte reactions and serum thymic factor level in Down's syndrome.
Authors: Franceschi C , Licastro F , Chiricolo M , Bonetti F , Zannotti M , Fabris N , Mocchegiani E , Fantini M P , Paolucci P , Masi M 
Published: December 2022

Abstract
The immune competence of the T lymphocyte system was studied in 28 noninstitutionalized subjects with Down's syndrome (DS) and were compared with sex- and age-matched healthy controls. The ability of enriched T lymphocytes to respond to 3 different T cell stimulants revealed a selective impairment of T lymphocyte subset(s). Subjects with DS showed normal responsiveness in allogeneic mixed lymphocyte reactions, but their response to phytohemagglutinin and in autologous mixed lymphocyte reactions was severely impaired. Non-T cells from DS subjects stimulated equally well both normal and DS allogeneic T lymphocytes. The blood concentration of serum thymic factor in the majority of DS subjects was much lower than that found in age-matched healthy controls. These data support the hypothesis that a deficiency of the T-dependent regulatory system is an intrinsic feature of DS and confirm the precocious aging of the immune system in these subjects.
Kinetics of cytolytic T lymphocyte binding to target cells in suspension.
Authors: Balk S P , Walker J , Mescher M F 
Published: December 2022

Abstract
Cytolytic T lymphocytes (CTL) were able to specifically bind and lyse allogeneic P815 tumor cells and LPS blast cells in suspension. An assay was developed to measure the rate of target cell binding in suspension independent of the rate of lysis. Target cell binding was found to plateau within 3 hr in suspension. The presence of free, functional CTL and targets at these plateaus was demonstrated, indicating that target cell binding was an equilibrium process. Scatchard plots were used to derive values for Kd (apparent affinity) and bmax (maximum binding). Target cell binding in suspension could not be blocked by purified plasma membranes. Target cell binding was compared for CTL generated by secondary in vitro stimulation with intact cells or with purified membranes. These 2 CTL populations yielded distinct values for Kd and bmax. Implications of this kinetic difference for CTL recognition of purified plasma membranes are discussed.
Serologic and structural characterization of immunoglobulin chains secreted by rabbit-mouse hybridomas.
Authors: Yarmush M L , Gates F T , Dreher K L , Kindt T J 
Published: December 2022

Abstract
Serologic and primary structural analyses of Ig chains secreted by several rabbit-mouse hybridomas have shown that these hybrid cells produce heavy (H) or light (L) chains identical to those isolated from rabbit sera. Two of the cell lines (7D2, 7D6) secreted rabbit H chains with a m.w. of 55,000 each of which expressed a full complement of variable and constant region allotypes (a3, d11, e15). These apparently normal rabbit H chains were secreted in a complex with a m.w. about 130,000, and serologic studies indicated that this complex contained a covalently linked mouse kappa L chain. Two other cell lines (4C1, 12F2) produced allotype b4 L chains with m.w. of 23,000 and 25,000, and a third (1D4P5) produced an allotype b5 L chain with a m.w. of 23,000. Serologic analyses indicated that the allotypes on these chains are equivalent to those expressed by normal rabbit Ig molecules. Partial amino acid sequence data obtained for the L chain products showed them to be typical of rabbit L chains, and to be significantly different from mouse L chains.
Immune complexes in tissues of obese strain (OS) chickens.
Authors: Katz D V , Kite J H , Albini B 
Published: December 2022

Abstract
Obese strain (OS) chickens develop spontaneous autoimmune thyroiditis (SAT) comparable in many aspects to human Hashimoto's thyroiditis. In a chronologic study on chickens of the Obese strain with B1B1 and B4B4 genotypes, immune and electron dense deposits suggesting immune complexes (IC) were found in the basal lamina of thyroid follicles (BLTF) as early as the time of hatching. The incidence of IC deposition in BLTF increased with age. In some of the chickens studied, thyroglobulin could also be demonstrated in the immune deposits. In addition, IC were also detected in the glomerular basement membrane of kidneys and in basement membranes of cecal tonsils. The early occurrence of IC in tissues of OS chickens suggests a possible primary role of these immune reactants in the pathogenesis of SAT.
Seeding of the 10-day mouse embryo thymic rudiment by lymphocyte precursors in vitro.
Authors: Fontaine-Perus J C , Calman F M , Kaplan C , Le Douarin N M 
Published: December 2022

Abstract
The thymic rudiment was removed from the mouse embryo at 10 days of gestation, while it was still included in the 3rd branchial arch. When cultured alone, either in vitro or on the chick chorioallantoic membrane (CAM), it failed to develop as a lymphopoietic organ and remained in an epithelial state. If it was associated in transfilter culture with various types of hemopoietic organs from either embryonic or adult mice (e.g. yolk sac, fetal liver, thymus, bone marrow), it became seeded by lymphoid precursor cells and underwent a normal histogenetic process. If the donor and the receptor explants belonged to different strains of mice, the thymus that developed in culture was chimeric: thymic stroma cells (i.e., epithelial and connective cells) were of the receptor explant type, whereas the lymphoid population was of the donor type. Two genetic markers were used to label the thymic cell types, the Thy-1-1-Thy-1-2 system and the isozymes of the glucose phosphate isomerase.