Abstract:
:The effect of IL-4 and transforming growth factor-beta (TGF-beta) on immunoglobulin secretion in vitro by peripheral blood mononuclear cells (PBMC) or purified B cells activated with murine EL4 thymoma cells and phorbol myristate acetate (PMA) was investigated. As previously reported, IL-4 induced IgE and IgG4 secretion by B cells in PBMC preparations and B cells activated with EL4 cells and PMA. However, when B cells, either in PBMC preparations or purified and activated with EL4 cells and PMA, spontaneously secreted large quantities of immunoglobulin, IL-4 suppressed the immunoglobulin secretion of all isotypes. IL-4 also suppressed the IgE secretion by B cells from an atopic dermatitis patient. This suppressive effect was not reversed by adding IL-2 or interferon-gamma (IFN-gamma) to the cultures. We also showed that TGF-beta suppressed the immunoglobulin secretion by purified B cells activated by EL4 cells and PMA. To investigate whether IL-4 or TGF-beta suppressed immunoglobulin secretion by in vivo 'switched' and isotype-committed B cells, sIgD- B cells were isolated, activated with EL4 cells and PMA and cultured with IL-4 or TGF-beta. Such activated B cells secreted large quantities of IgG1, IgG2, IgG3, IgA1, IgA2 and IgM, and IL-4 and TGF-beta suppressed all these isotypes by greater than 80%. The data demonstrated that IL-4 and TGF-beta suppress immunoglobulin secretion in vitro by in vivo isotype-committed sIgD- B cells, suggesting that these lymphokines may play a down-regulatory role on differentiated isotype-committed B cells in an isotype-unrestricted manner. The data also showed that IL-4 and TGF-beta acted directly on isolated B cells.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Ninomiya C,Spiegelberg HLdoi
10.1111/j.1365-2249.1992.tb06942.xsubject
Has Abstractpub_date
1992-08-01 00:00:00pages
261-8issue
2eissn
0009-9104issn
1365-2249journal_volume
89pub_type
杂志文章abstract::Using the natural killer (NK) sensitive K562 cell line, enhanced NK cell cytotoxicity was demonstrable early in the course of acute hepatitis B while normal values were obtained in patients studied during convalescence. No evidence of enhanced NK activity was instead obtained in the course of acute non-A, non-B hepati...
journal_title:Clinical and experimental immunology
pub_type: 杂志文章
doi:
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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更新日期:1978-04-01 00:00:00
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
doi:
更新日期:1984-12-01 00:00:00
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
doi:
更新日期:1978-06-01 00:00:00
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
doi:
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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更新日期:1984-07-01 00:00:00
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
pub_type: 杂志文章
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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journal_title:Clinical and experimental immunology
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