bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biochemical analysis of initial triggering events of IgE-mediated histamine release from human lung mast cells.
Authors: Ishizaka T , Conrad D H , Schulman E S , Sterk A R , Ishizaka K 
Published: December 2022

Abstract
Mast cells were isolated from human lung tissues by counter current centrifugation elutriation, followed by flotation through Percoll gradients. Purified human mast cells released histamine upon challenge with anti-IgE. An optimal concentration of anti-IgE for maximum histamine release from human lung mast cells was comparable to that required for histamine release from normal human basophil granulocytes. Human lung mast cells could be passively sensitized with mouse monoclonal IgE antibody for antigen-induced histamine release. Bridging of cell-bound IgE molecules on human mast cells by anti-IgE or its F(ab')2 fragments induced phospholipid methylation and an increase in intracellular cyclic AMP (cAMP). Incorporation of [3H]methyl groups into phospholipid reached a maximum at 30 sec after challenge with anti-IgE, whereas intracellular cAMP reached a maximum at 1 min. Both values declined to base line levels within 2 to 3 min. These biochemical events were followed by Ca2+ influx and histamine release. Ca2+ uptake and histamine release reached maximum at 2 to 3 min and 5 to 8 min, respectively. Neither phospholipid methylation nor initial rise in cAMP was inhibited by indomethacin, which indicates that these biochemical events are not the result of prostaglandin synthesis. However, inhibition of phospholipid methylation by inhibitors of S-adenosyl-L-methionine-mediated methylation, such as 3-deazaadenosine and S-isobutyryl 3-deazaadenosine, inhibited not only phospholipid methylation but also cAMP rise and subsequent Ca2+ uptake and histamine release. The results indicate that phospholipid methylation induced by bridging of IgE receptors on human mast cells is essential for Ca2+ influx and histamine release.
Delayed hypersensitivity to Newcastle disease virus in high and low interferon-producing mice.
Authors: De Maeyer E , De Maeyer-Guignard J 
Published: December 2022

Abstract
Since it was previously shown that IFN, under certain conditions, can stimulate sensitization to SRBC, we examined the intensity and duration of DH to NDV in high and low IFN-alpha and -beta producing mice that carried either the h or I allele at the If-1 locus. In C57BL/6 mice (If-1h) DH to NDV is of higher intensity and longer duration than in BALB/c (If-1l). Evidence that this difference is related to the higher IFN-alpha and -beta production induced by NDV in C57BL/6 mice was obtained by comparing DH to NDV in C57BL/6 (If-1h) mice and in mice of three congenic strains, carrying the If-1l allele on a C57BL/6 background (B6.C-H-28c-If-1l). In the latter, DH to NDV was much more of BALB/c than of C57BL/6 type, since after footpad challenge a significant reaction was only observed at 24 hr and no longer at 48 hr. When the low endogenous IFN production of the If-1l congenic mice was compensated for by giving extra IFN-alpha and -beta a few hours after sensitization with NDV, DH was enhanced. If, on the other hand, anti IFN-alpha and -beta globulins were administered to either C57BL/6 or If-1l congenic mice immediately after sensitization with NDV, DH was decreased. These results indicate that, on a C57BL/6 background, the establishment of DH to NDV is influenced by the alleles at If-1, determining the levels of endogenous IFN-alpha and -beta induced by NDV.
gamma Interferon production appears to predict time of recurrence of herpes labialis.
Authors: Cunningham A L , Merigan T C 
Published: December 2022

Abstract
Peripheral blood mononuclear cells separated from the blood of 29 volunteers within 3 wk of the onset of recurrent oral herpes labialis spontaneously secreted IFN-gamma (and small amounts of IFN-beta) into the culture medium in varying amounts (mean = 77 U/ml, SE = 17). However, interferon could not be detected in the serum of 10 of these patients tested. In the group as a whole, peak levels of interferon were secreted in vitro at 6 to 20 days after the onset of herpes labialis. Serial studies in eight patients showed peak production in the second or third week, with subsequent decrease to undetectable levels at 6 wk. A strong correlation between peak supernatant interferon level and the time to the next recurrence of herpes labialis in each patient was noted (r = 0.82, p less than 0.0001). Herpes simplex antigen-stimulated mononuclear cell cultures from each patient produced a mixture of IFN-alpha and IFN-gamma. A less marked but still significant correlation was noted between the peak mixed interferon level and the inter-recurrence interval (r = 0.52, p less than 0.005). These results suggest that a recurrent herpes labialis acts as an in vivo stimulus to the induction of IFN-gamma-producing cells that circulate in peripheral blood. The IFN-gamma produced is either a direct determinant of frequency of recurrence of herpes or a quantitative marker for other cellular immune events determining frequency.
Target determinants for F1 hybrid anti-parental H-2d cell-mediated lympholysis: self antigens controlled by the D end.
Authors: Nakamura I , Nakano K , Cudkowicz G 
Published: December 2022

Abstract
The immunogenetic specificity and reactivity with syngeneic target cells were determined for (C57BL/6 x DBA/2)F1 anti-parental DBA/2 cytotoxic T lymphocytes (CTL) elicited in primary mixed spleen cell cultures. A panel of peritoneal exudate cells (PEC) from mice bearing nonrecombinant and recombinant H-2-Tla haplotypes and their F1 hybrids was used as the source of target and inhibitor cells for direct lytic and competitive inhibition assays. PEC of H-2d and several recombinant haplotypes bearing the d alleles at the D region, including H-2u, were as susceptible to lysis as parental DBA/2 PEC, irrespective of non-N-2 genetic constitution. Those of H-2b, H-2k, H-2s, and recombinant haplotypes not carrying the d allele in the D region were not lysed above the background levels. Syngeneic F1 PEC were not lysed by CTL, but were nevertheless capable of inhibiting the lysis of DBA/2 PEC, albeit slightly less effectively than homozygous Dd-positive PEC inhibitors. Mapping by inhibition assays indicated that the presence of at least one copy of the H-2Dd allele was necessary and was sufficient to confer inhibitory capacity to H-2 heterozygous PEC. These results extend previous observations on primary F1 anti-parental H-2b and H-2k cell-mediated lympholysis (CML) and indicate generality of autoreactive F1 anti-parent CML responses against surface structures coded for or controlled by H-2K or H-2D region genes.
Phorbolester-treated human lymphocytes are susceptible to natural killer cell-mediated cytolysis.
Authors: Kabelitz D , Kunkel H G 
Published: December 2022

Abstract
The tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) was found in this study to render normal human lymphocytes susceptible to allogeneic and autologous natural killer (NK) cell lysis. Both T and non-T cells became susceptible after culture for 3 days in the presence of 1 ng/ml TPA. Effector cells were nonadherent mononuclear cells of low density, enriched for large granular lymphocytes and HNK-1+ cells. Activation of effector cells with interferon increased lysis of TPA-treated lymphocytes. The present system may provide a new model to study NK cell target structures.
Two distinct suppressor T cells acting in concert cause suppression of cytolytic T lymphocyte (CTL) response to hapten-altered self in vivo.
Authors: Gautam S C , Beckman K D , Wong H L , Battisto J R 
Published: December 2022

Abstract
The participation of two subpopulations of suppressor T cells (Ts) active in the suppression of hapten-specific contact sensitivity (CS) was investigated in the down-regulation of in vivo development of CTL to hapten-altered self. We have shown that Ts efferent (Ts-eff) cell that is induced by tolerizing mice with an i.v. injection of hapten-coupled syngeneic spleen cells, and the auxiliary Ts cell (Ts-aux), which is generated by dermal application of hapten, together suppress the generation of CTL. Thus, when tolerant mice possessing Ts-eff cells were concomitantly sensitized for CTL and CS (which causes the arisal of Ts-aux and TDTH effector cells), the development of CTL was suppressed. Furthermore, adoptive transfer of lymph node cells from dermally sensitized mice into tolerant mice also suppressed the CTL response. Use of lymph node cells from mice pretreated with cyclophosphamide before dermal sensitization and therefore lacking Ts-aux cells was not efficient in suppressing the CTL response. Thus, neither Ts-eff alone nor TDTH in conjunction with Ts-aux were capable of suppressing the development of CTL. In addition to supporting the view that the in vivo generation of CTL is suppressed when both Ts-eff and Ts-aux cells are present, the data indicate that suppressor cells operational for one T cell-mediated response (CS) are equally functional for a separate unrelated one (CTL).
Delayed hypersensitivity in mast-cell-deficient mice.
Authors: Thomas W R , Schrader J W 
Published: December 2022

Abstract
The ability of mast cell-deficient Wf/Wf and W/Wv mice to produced delayed hypersensitivity responses was examined. The W/Wv mice did not have detectable mast cells and could not produce IgE-mediated passive cutaneous anaphylaxis. Mice of both genotypes produced large delayed hypersensitivity responses to the contact sensitizers oxazolone and picryl chloride. The responses were indistinguishable from responses of control mice when challenged with optimal or suboptimal doses of antigen. Delayed hypersensitivity could be transferred into Wf/Wf mice by an antigen-specific T cell line, and the proliferative responses in the lymph nodes of these mice after, painting with sensitizer, were normal.
Derivatized guanine nucleosides: a new class of adjuvant for in vitro antibody responses.
Authors: Goodman M G , Weigle W O 
Published: December 2022

Abstract
Guanine ribonucleosides, substituted at the C8 position with either a bromine or thiol group, are potent adjuvants when added to culture with antigen. Responses from both naive and antigen-experienced B cells are augmented by the presence of the nucleoside derivatives. Like the induction of B cell proliferation and polyclonal immunoglobulin secretion, enhancement of antibody responses is not attributable to structural analogy between 8BrGuo and the cyclic nucleotide 8Br-cGMP, because the latter compound is unable to augment the antibody response. The capacity of 8MGuo to augment both T-independent and T helper factor-supported antibody responses suggests that the nucleoside acts by directly interacting with B cells and/or antigen-presenting cells. 8MGuo retains its full adjuvant activity even when added 3 days after culture initiation, a time that is too late for freshly added T cells to support a response. Finally, supplementation of cultures of spleen cells from immunodeficient (CBA/N x CBA/CaJ)F1 male mice with the nucleoside effectively restored to normal their capacity to generate an antibody response.
Seasonal rhythmicity in lymphocyte blastogenic responses of mice persists in a constant environment.
Authors: Brock M A 
Published: December 2022

Abstract
Young C57BL/6 mice were housed in an environment in which the ambient temperature (22.5 degrees C +/- 1 degree) and photo-period were constant for the duration of the observations. At weekly intervals, animals were sacrificed, and splenic single cell suspensions were tested for percentage of viable cells. The functional capacity of T and B lymphocytes was assessed in vitro by the mitogen-induced incorporation of tritiated thymidine by dividing cells. The lymphocytes were incubated in RPMI 1640 containing 10% fetal calf serum for 68 hr at 37 degrees C. T and B lymphocytes were stimulated with phytohemagglutinin-P and concanavalin A and with lipopolysaccharide, respectively. Seasonal rhythmicity in the incorporation of tritiated thymidine was exhibited by both lymphocyte subpopulations, with peak responses two to five times higher in March to April 1978 and February to March 1979 than during the previous two Decembers. Factors such as birth date of the mice and components of the culture medium had no influence on the results. Because the annual cycles persisted in the absence of known environmental signals or Zeitgebers, they bear similarities with circannual rhythms. It is suggested that a relationship may exist in mice and in other species between seasonally depressed immune functions and increased incidence of infectious agents.
Suppression of T lymphocyte functions by human C3 fragments. I. Inhibition of human T cell proliferative responses by a kallikrein cleavage fragment of human iC3b.
Authors: Meuth J L , Morgan E L , DiSipio R G , Hugli T E 
Published: December 2022

Abstract
Cleavage of human iC3b by kallikrein isolated from human plasma generates a fragment, C3d-K, which is capable of inhibiting mitogen-, antigen-, and alloantigen-induced T lymphocyte proliferation. Native C3, C3a, C3b, and C3c-K had no effect on lymphocyte proliferative responses. In addition to being a potent suppressor of mitogen- and antigen-induced proliferation, C3d-K is capable of inducing leukocytosis in both mice and rabbits. Intravenous injection of C3d-K, but not C3, C3a, C3b, or C3c-K, results in a twofold to threefold increase in the number of circulating leukocytes. Thus, C3d-K exhibits two apparently independent functions, namely suppression of T cell proliferation and leukocytosis. Cleavage of iC3b by kallikrein results in the production of only two fragments. The larger fragment, C3c-K, is 144,000 m.w. and has a chemical structure analogous to that of C3c obtained from the cleavage of C3 by trypsin or elastase. The smaller fragment, C3d-K, is 41,000 m.w. and contains the metastable binding site of C3. It is through this site located in the C3d region of the molecule that C3 attaches covalently to target cells. Analysis of the amino terminal region of C3d-K provided a sequence that fails to overlap with any sequence yet reported for other characterized C3 fragments, including C3d originally obtained from elastase digestion. A revised model of the C3 molecule is proposed, with locations of the C3e and C3d fragments assigned on the basis of chemical analyses.
Blocking of human T lymphocyte functions by anti-Leu-2 and anti-Leu-3 antibodies: differential inhibition of proliferation and suppression.
Authors: Engleman E G , Benike C J , Metzler C , Gatenby P A , Evans R L 
Published: December 2022

Abstract
We have shown previously that monoclonal antibodies to the Leu-2 and Leu-3 T cell antigens block the response of their respective subsets in allogeneic MLR. The present study was an effort to explore the mechanism of inhibition and to determine if anti-Leu-2 and anti-Leu-3 antibodies affect the responses to stimuli in addition to alloantigens. Our results indicate that antibodies to Leu-2 and Leu-3 have profound inhibitory effects on proliferation by their respective T cell subsets responding to a variety of stimuli, including specific soluble antigens and alloantigen. This effect was characterized by the following features: a) For optimal inhibition of proliferation, antibody must be present at the onset of antigenic stimulation. b) Inhibition is augmented by increasing the concentration of antibody or decreasing the concentration of antigen. c) Fab fragments of both anti-Leu-2a and anti-Leu-3a antibodies also block proliferation. In addition to their effects on T cell proliferation, anti-Leu-3 antibody blocked T cell-dependent lg synthesis induced in MLR, and anti-Leu-2 antibody prevented the induction, in vitro, of Leu-2+3- suppressor cells of lg synthesis. Taken together, these results suggest that antibodies to antigenic determinants on the Leu-2 and Leu-3 molecules competitively block segments of these structures that bind to alloantigen or nominal antigen. On the other hand, anti-Leu-2a antibody failed to block suppression of the MLR by in vivo activated, antigen-specific Leu-2+3- suppressor cells, which suggests that the Leu-2a epitope does not transmit antigen-specific signals from these differentiated suppressor T cells.
The complement-mediated binding of soluble antibody/dsDNA immune complexes to human neutrophils.
Authors: Taylor R P , Burge J , Horgan C , Shasby D M 
Published: December 2022

Abstract
The complement-mediated binding of soluble antibody/3H-dsDNA immune complexes (prepared in vitro) to human polymorphonuclear leukocytes (PMN) has been investigated quantitatively. Studies with isolated complement components in conjunction with experiments on the binding of these complexes to human red blood cells suggest that the binding to both cell types is mediated predominantly by CR1 (C4b-C3b) receptors but that CR3 (iC3b or C3d-g) receptors may play a role in binding to PMN but probably not to RBC. Our results also indicate that under the standard conditions of these assays (37 degrees C, 20 to 40 min incubations) there is no significant internalization of the soluble antibody/dsDNA immune complexes after they are bound by the PMN.
Cellular and growth factor requirements for activation of human T lymphocytes by neuraminidase and galactose oxidase-treated lymphoid cells.
Authors: Lipkowitz S , Rubin A L , Stenzel K H , Novogrodsky A 
Published: December 2022

Abstract
Proliferation of peripheral blood mononuclear leukocytes (PBL) can be stimulated by irradiated autologous PBL that have been treated with neuraminidase and galactose oxidase (NAGO). We determined the types of cells that stimulate and respond by isolating populations of cells enriched for macrophages, B lymphocytes, and T lymphocytes. With PBL as responding cells, proliferation was stimulated by irradiated, NAGO-treated cells with the following hierarchy: macrophage greater than PBL greater than B cells greater than T cells. Irradiated NAGO-treated macrophages and PBL induced proliferation of isolated T cells greater than or equal to the proliferation they stimulated in PBL, indicating that T cells are the predominant responding cell type. Irradiated, NAGO-treated B cells or T cells were weak stimulators of isolated T cell proliferation when compared to their ability to stimulate PBL. The ability of irradiated NAGO-treated B cells or T cells to stimulate isolated T cell proliferation was greatly enhanced by the addition of untreated macrophages or by the addition of conditioned media from mitogen-activated PBL. Biologic, biochemical, and biophysical characterization of the conditioned media revealed it contained both lymphocyte polypeptide growth factors, interleukin 1 and interleukin 2. Semipurified preparations of either of these growth factors were capable of enhancing T cell proliferation stimulated by irradiated NAGO-treated B or T cells. These data indicate T cell proliferation induced by irradiated, NAGO-treated cells requires the aldehyde-bearing cells for the induction of soluble growth factor production and for the induction of putative membrane receptors for these growth factors.
The role of interleukin 1 in human B cell activation: inhibition of B cell proliferation and the generation of immunoglobulin-secreting cells by an antibody against human leukocytic pyrogen.
Authors: Lipsky P E , Thompson P A , Rosenwasser L J , Dinarello C A 
Published: December 2022

Abstract
The role of factors released by monocytes (M phi) in the activation of human B lymphocytes was examined by studying the effect of an antiserum against human leukocytic pyrogen (LP) on mitogen-stimulated B cell proliferation and the generation of immunoglobulin-secreting cells (ISC) by peripheral blood mononuclear cells (PBM). Antiserum against LP was obtained from rabbits immunized with LP-containing human M phi supernatants. The globulin fraction of this antiserum inhibited pokeweed mitogen- (PWM) stimulated B cell proliferation and the generation of ISC in a concentration-dependent manner, with 50% inhibition of responsiveness observed with 10 micrograms/ml. By contrast, PWM-induced T cell [3H]thymidine incorporation was not inhibited by concentrations of anti-LP as great as 2000 micrograms/ml. The F(ab')2 fraction of anti-LP also inhibited the generation of ISC in response to both PWM and formalinized Staphylococcus aureus, but required 50 micrograms/ml to achieve 50% inhibition. Anti-LP inhibited the generation of ISC only if present during the first 24 hr of a 6 to 7-day incubation; later addition was not inhibitory. Inhibition was more marked in cultures partially depleted of M phi than in whole PBM cultures. Whereas absorption of the anti-LP with PBM failed to remove the capacity to inhibit the generation of ISC, anti-LP-mediated inhibition of responsiveness could be reversed by the addition of crude M phi culture supernatants or a variety of highly purified interleukin 1 (IL 1) preparations, but not by T cell supernatants. These results indicate anti-LP inhibits human B cell activation by removing the requisite M phi-derived factor IL 1 and also confirm that IL 1 plays an essential role in B cell proliferation and the generation of ISC in man.
T cell lines and variant subclones with differing susceptibility to tumor promoters.
Authors: Di Pauli R , Rassat J 
Published: December 2022

Abstract
The effect of tumor-promoting phorbol esters on cloned cytotoxic T cell (CTL) lines, H-2 restricted and specific for minor histocompatibility antigens, was studied. We found that two of the three CTL lines tested can be induced by 12-O-tetradecanoylphorbol 13 acetate (TPA or PMA) to synthesize DNA. One of the lines did not respond. TPA concentrations in the range of 1 nmol were active, and induction of DNA synthesis was independent from cell densities. Testing of other phorbol esters showed correlations with their tumor-promoting activity, because TPA and phorbol 12,13-didecanoate were active, whereas phorbol and 4 alpha phorbol 12,13-didecanoate had no effect. Interestingly, two subclones isolated from one of the lines responding to TPA behaved differently: one of the subclones synthesized DNA when incubated with TPA, whereas the other remained completely negative. This difference was reflected also in the dissimilarity of morphologic alterations (observed by scanning electron microscopy) occurring in the responding cells. The nonresponsiveness, in terms of DNA synthesis, by some of the CTL lines is not due to a lack of interaction between TPA and the cells. When incubated simultaneously with TPA and T cell growth factor (IL 2), all lines responded with greater DNA synthesis than when incubated with IL 2 or TPA alone, thus demonstrating a synergistic action between TPA and IL 2. We have also done experiments to test whether TPA induces the synthesis and secretion of a factor leading to proliferation of the cells. From bystander experiments it appears that the action of TPA is not mediated by a secreted product but is a direct one.