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• W2139458081 startingPage "1417" @default.
• W2139458081 abstract "We have examined signaling roles for CD54 intercellular adhesion molecule 1 and major histocompatibility complex (MHC) II as contact ligands during T help for B cell activation. We used a T helper 1 (Th1)-dependent helper system that was previously shown to be contact as well as interleukin 2 (IL-2) dependent to demonstrate the relative roles of CD54, MHC II, and CD40 signaling in the events leading to the induction of B cell proliferation and responsiveness to IL-2. Paraformaldehyde-fixed activated Th1-induced expression of IL-2R alpha, IL-2R beta, and B7, and upregulated MHC II and CD54 on B cells. Anti-CD54 and MHC II mAbs as well as a CD8 alpha-CD40 ligand (L) soluble construct inhibited both the T-dependent induction of Ig secretion, and B cell phenotypic changes. We then compared the effects of activated Th1 cells with that of cross-linking these molecules. Cross-linking of CD54 and MHC II resulted in the upregulated expression of MHC II and of CD54 and B7, respectively, analogous to the effect of fixed activated Th1 cells. B7 expression was further enhanced by co-cross-linking CD54 and MHC II. Cross-linking of CD40 achieved comparable effects. Strikingly, cross-linking ligation of CD54 and MHC II in the presence of IL-5 induced expression of a functional IL-2R on small resting B cells. By contrast CD40 ligation, which induced B cell proliferation, did not induce IL-2 responsiveness. These data show that CD40 ligation is necessary but may not be sufficient for B cell differentiation and identify CD54 and MHC II as contact ligands that can complement CD40 signaling in the generation of T-dependent B cell responses to IL-2." @default.
• W2139458081 created "2016-06-24" @default.
• W2139458081 creator A5054164188 @default.
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• W2139458081 date "1994-05-01" @default.
• W2139458081 modified "2023-09-23" @default.
• W2139458081 title "CD54/intercellular adhesion molecule 1 and major histocompatibility complex II signaling induces B cells to express interleukin 2 receptors and complements help provided through CD40 ligation." @default.
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• W2139458081 doi "https://doi.org/10.1084/jem.179.5.1417" @default.
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