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- W73686804 abstract "TGF-beta1 is a potent IgA isotype switching factor. However the cell population that generates the TGF-beta is not known. In this study, we examined the origin of the TGF-beta1 that is secreted by LPS-activated murine total spleen cell cultures and that is responsible for IgA isotype switching. Treatment with anti-TGFbeta1 antibody decreased IgA secretion 2 fold in these cultures and caused a 5-fold decrease in the number of IgA secreting cells. In Mphi-depleted spleen cell populations, this IgA response was markedly reduced and anti-TGFbeta1 antibody had no additional effect on IgA production. The inference that Mphi-derived TGF-beta1 is responsible for the isotype switching is supported by observations with the macrophage line, P388D1. LPS, particularly in the presence of IFN-gamma, induced P388D1 cells to secrete active TGF-beta1. The supernatant from such an activated P388D1 culture, in combination of IL-2, stimulated IgA secretion and this effect was abolished by anti-TGFbeta1 antibody." @default.
- W73686804 created "2016-06-24" @default.
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- W73686804 date "2003-10-31" @default.
- W73686804 modified "2023-09-23" @default.
- W73686804 title "Macrophage-derived TGF-beta1 induces IgA isotype expression." @default.
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