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Results for “ANTIBODY FORMATION”

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At least 199 records · Page 11Linked to original sources
PubMed1986

Inhibition of IgE antibody formation by n-pentyl alpha-L-sorbopyranoside.

Effect of n-pentyl glycosides and alkyl alpha-L-sorbopyranosides on IgE antibody formation in rats and mice were investigated. When n-pentyl alpha-L-sorbopyranoside was given subcutaneously or orally, the IgE antibody formation in rats and mice was suppressed, while no suppression of hemagglutinin formation was observed. The study on timing of administration indicated that n-pentyl alpha-L-sorbopyranoside significantly suppressed the secondary IgE antibody response when administered before the secondary immunization.

Animals↗
PubMed1978

[Effect of stromal fibroblasts on antibody formation in cultures deficient in A-cells].

Stromal fibroblasts from the monolayer cultures of the rabbit thymus, spleen, and bone marrow when added to suspension cultures of non-adherent rabbit spleen cells had a significant effect on the response of the plaque-forming cells (PFC). Thymus-derived stromal fibroblasts caused an increase in the number of PFC, and bone marrow stromal fibroblasts suppressed the antibody formation in these cultures. Spleen-derived stromal fibroblasts influenced the PFC response similarly to adherent cells. Thymus-derived stromal fibroblasts irradiated by 5000 R influenced the PFC response in the same way as non-irradiated cells. The action of stromal fibroblasts on the antibody formation in the cultures depended on their attachment to the culture flask surface.

Animals↗
PubMed1992

[Effects of suplatast tosilate (IPD-1151T) on antibody formations in mice].

We examined the effects of suplatast tosilate (IPD-1151T) on antibody formation in mice, and the following results were obtained: 1) IPD-1151T clearly increased the productions of IgM and IgG-hemolytic plaque forming cells (PFC) in mice immunized with sheep red blood cells (SRBC) when the agent was given p.o. for 5 days from the day of immunization. 2) IgM and IgG-PFC productions in old mice, 60 weeks of age, were clearly lower than those in adult mice, 10 weeks of age; and an oral administration of IPD-1151T significantly recovered the decayed PFC-production in the old mice. 3) IPD-1151T clearly suppressed the production of anti-dinitrophenyl (DNP)-IgE antibody in mice when the agent was given p.o. for 5 days from the day of immunization, whereas the agent did not affect anti-DNP-IgM and IgG antibody productions. 4) IPD-1151T did not affect the induction phase of the cellular immune reaction of picryl chloride-induced contact dermatitis and the SRBC-induced footpad reaction. Our present results suggest that IPD-1151T has a class-specific suppressive effect on the production of IgE antibody, but does not suppress the other immune responses.

Animals↗
PubMed1966

Antibody formation by single cells from lymph nodes and efferent lymph of sheep.

The antibody-forming cells which appear in the popliteal lymph node and efferent lymph of the sheep following immunization with boiled Salmonella have been studied by light and electron microscopy. Cells were incubated in monolayers with target erythrocytes sensitized with bacterial lipopolysaccharide. Three types of interaction between a proportion of the lymph cells and the erythrocytes surrounding them have been shown to indicate antibody formation: plaque-formation, immuno-cyto-adherence, and localized agglutination. At the peak of the response, 4 days after antigenic stimulation approximately 1 cell in every 200 from lymph node suspensions produces detectable specific antibody, while up to 1 cell in 20 in the lymph is active. For light microscope examination, individual antibody-forming cells were smeared in serum and stained with Leishman's stain. For electron microscopy, a number of active cells were clumped with antiserum to form a specimen of convenient size, then sectioned. Most of the active cells from efferent lymph are large and basophilic, while a small proportion are blastlike. These cells contain abundant free ribosomes and very little endoplasmic reticulum. In the node only, an additional class of antibody-forming plasma cells is found which have considerable amounts of endoplasmic reticulum in their cytoplasm.

Animals↗
PubMed1978

Studies on the adjuvant effect of water-in-oil-in-water (w/o/w) emulsion of sesame oil. 1. Enhanced and persistent antibody formation by antigen incorporated into the water-in-oil-in-water emulsion.

Water-in-oil-in-water (w/o/w) emulsion developed in our laboratory is as effective as water-in-oil (w/o) emulsion of Freund's incomplete adjuvant (FIA) in the stimulation of antibody formation. The emulsion is prepared by redispersion of water-in-sesame oil emulsion of an antigen solution in phosphate buffered saline with emulsifier, Tween 80. The emulsion can be stored at 4 degrees C for at least 3 months without any evidence of change in the adjuvanticity and in the w/o/w state. Even a single injection of bovine serum albumin (BSA) in the w/o/w emulsion elicited a high antibody response in mice over the period of almost whole lifespan. 10 microgram BSA in w/o/w could stimulate antibody formation up to 2(12) in hemagglutination titer, while the same dose in free solution did not elicit any detectable antibody. The tissue reactions caused by the w/o/w emulsion at the injected site and in the regional lymph nodes were much less prominent than those by FIA.

Adjuvants, Immunologic↗
PubMed1959

Studies on the adjuvant action of bacterial endotoxins on antibody formation. III. Histologic response of the rabbit spleen to a single injection of a purified protein antigen.

Histologic changes occurring in the rabbit spleen during the primary response to intravenous injection of bovine gamma globulin alone and in combination with bacterial endotoxin have been described. The predominant morphologic changes associated with antibody formation in animals that received antigen alone were confined to the follicular areas of the spleen. Only minimal changes were seen in the red pulp. No new cellular types appeared following endotoxin stimulus. Rather, a profound augmentation of events observed following a single injection of bovine gamma globulin alone appears to account for the higher levels of antibody incited by this adjuvant. The cell type important in antibody formation under these conditions appeared to be a modified reticular cell. Plasma cells were not part of the cellular reaction. A hypothesis describing the primary antibody response is presented.

Adjuvants, Immunologic↗
PubMed1979

[Mechanism of action of T cell factors regulating antibody formation].

While the induction of antibody synthesis depends on antigen specific T cell factors, its magnitude is under control of non antigen specific T cell factors. In this respect, TRF ("T cell Replacing Factor") amplifies antibody responses while IBF ("Immunoglobulin Binding Factor") acts as a suppressor factor. Using cultures of spleen cells from nude mice, we show that both factors act sequentially, influencing the final differenciation of B cells to antibody producing cells. We have no evidence of direct interaction between TRF and IBF.

Animals↗
PubMed1988

Supplemental zinc restores antibody formation in cultures of aged spleen cells. III. Impairment of II-2-mediated responses.

The effects of zinc on interleukin-2(IL-2)-dependent T cell responses of lymphocytes from immunodepressed aged mice and from young adult animals were studied. Concentrations of zinc which have been shown to restore antibody formation in cells from aged mice and to increase the production of Il-1 and Il-4 inhibited the production of Il-2. Cells from both young adults and aged mice were inhibited similarly. Zinc also impaired the ability of aged T cells to proliferate in response to concanavalin A and exogenous Il-2, but enhanced the proliferation of similarly activated splenic cultures containing both T and B cells. Cultures of isolated B lymphocytes produced antibody to sheep red blood cells if the cells were provided with supplemental zinc and Il-1. In contrast, recombinant Il-2 with or without zinc did not activate antibody formation. The results support the premise that the restorative effects of zinc are independent of Il-2 and that Il-2 is not a necessary mediator for antibody production in the aged.

Aging↗
PubMed1977

Preferential enhancement of IgE antibody formation by Bordetella pertussis.

Preferential enhancement of IgE antibody response was observed in BALF/c mice by the administration of Bordetella pertussis with antigen (DNP-Salmonella). Correlation between B cell mitogenic activity and adjuvant action among B. pertussis, Salmonella, lipopolysaccharide of Escherichia coli and Ficoll was examined but was not found. Thymus-derived cells seemed necessary to develop adjuvant action of B. pertussis since antibody response in athymic nude mice was not influenced by B. pertussis. Helper function of adoptively transfered spleen cells was enhanced by immunization of the donor mice with carrier antigen in the presence of B. pertussis. The magnitude of enhancement was greatest in IgE class. The results indicated that preferential enhancement of IgE antibody formation by B. pertussis is mediated by the augmentation of carrier-specific helper function.

Adjuvants, Immunologic↗
PubMed1999

Implication of interfering antibody formation and apoptosis as two different mechanisms leading to variable duration of adenovirus-mediated transgene expression in immune-competent mice.

This study explores the genetic and immunologic factors involved in the differences in duration of transgene expression following in vivo transduction with recombinant adenoviruses. Different strains of mice (C3H/HeJ [C3H], C57BL/6J [B6], BALB/cJ [Balb/c], C. B10-H2(b)/LiMcdJ [Balb.B], CB6F1/J [(Balb/c x B6)F1], B6C3F1/J [(B6 x C3H)F1], and BALB/cj SCID) received 5 x 10(9) PFU of the first-generation adenovirus, which expresses human alpha1-antitrypsin (Ad/RSVhAAT). While all strains studied showed similar patterns of anti-adenovirus antibody formation, only Balb/c and C3H mice developed significant levels of anti-hAAT antibodies by 8 weeks posttransduction. In addition, while all strains had quantitatively comparable amounts of adenovirus genomes and hAAT mRNA transcripts in the liver 9 days posttransduction, only Balb/c mice had undetectable adenovirus vector genomes and hAAT mRNA in the liver 40 days posttransduction. Terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling staining of liver sections from control and Ad/RSVhAAT-infected mice 5, 9, and 40 days posttransduction suggested that apoptosis was involved in the rapid elimination of transduced hepatocytes in Balb/c mice. Persistent expression of hAAT protein observed in BALB/cj SCID mice suggests that antigen-dependent immunity was essential for this apoptotic process in transduced Balb/c hepatocytes. In contrast to Balb/c mice, the loss of expression in C3H mice did not correlate with the loss of vector genomes or hAAT mRNA. Instead, the anti-hAAT antibodies in C3H but not Balb/c mice were found to interfere with detection of hAAT in the serum. In Balb. B and B6 mice, vector genome, hAAT mRNA transcripts, and hAAT protein levels persisted for at least 40 days posttransduction. This persistence correlated with poor anti-hAAT antibody formation and minimal hepatocyte toxicity. The expression of hAAT in (Balb/c x B6)F1 pups was found to be intermediate between the duration observed in the parental strains, while in (C3H x B6)F1 pups hAAT expression was similar to that seen in the B6 parents, which together support polygenic control of the immune responses in these mice. In summary, these findings suggest that there are three different profiles and at least two defined immune system-mediated mechanisms resulting in the loss of hAAT expression in mice and that different strains differ in the capacity to utilize these mechanisms.

Adenoviridae↗