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- W4313347816 abstract "Abstract IL-4 and IFN-γ each have potent effects on B cell responses as well as strong mutual antagonism. Here we have examined the quantitative effects of these cytokines on CD40 ligand-induced B cell proliferation, cell survival, and division-linked isotype switching. Both IL-4 (strongly) and IFN-γ (weakly) enhanced the number of B cells found in culture by reducing the average time cells take to enter the first division cycle and by promoting B cell survival. When added in combination, the net effect of IL-4 and IFN-γ on time to division and survival was a response intermediate between that of the two cytokines alone, indicating a partial antagonism of IL-4 by IFN-γ. By modulating both time to division and cell survival, these small effects of IFN-γ are amplified and give rise to large reductions in cell number in the presence of IL-4. At higher concentrations, IFN-γ had minor inhibitory effects on IL-4-induced isotype switching to IgG1 and greater effects on IgE. A reciprocal relation was observed between the ability to inhibit IgE at late cell divisions vs induction of IgG2a. In contrast, IL-4 did not prevent switching to IgG2a induced by IFN-γ alone. Therefore, antagonism between IFN-γ and IL-4 is observed at multiple levels and over different concentration ranges, resulting in complex net outcomes. The evolutionary significance of this complexity is discussed." @default.
- W4313347816 created "2023-01-06" @default.
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- W4313347816 date "1999-10-15" @default.
- W4313347816 modified "2023-10-16" @default.
- W4313347816 title "Integrating Signals from IFN-γ and IL-4 by B Cells: Positive and Negative Effects on CD40 Ligand-Induced Proliferation, Survival, and Division-Linked Isotype Switching to IgG1, IgE, and IgG2a" @default.
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- W4313347816 doi "https://doi.org/10.4049/jimmunol.163.8.4175" @default.
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