Abstract
CD40 activation is necessary for thymus-dependent humoral immune responses and rescuing both phenotypically immature WEHI-231 B lymphoma cells from B cell antigen receptor-induced cell death and germinal center B cells from spontaneous apoptosis. As some effects of CD40 are probably mediated by differences in gene expression, cDNA expression arrays and RNase protection assays were used to identify the anti-apoptotic Bcl-2 homolog A1 as a CD40-inducible gene in B cell lines and purified germinal center B cells. Sustained CD40-induced A1 upregulation correlated with CD40-mediated rescue of WEHI-231 cells from anti-IgM-induced apoptosis. Moreover, overexpression of A1 specifically protected WEHI-231 cells from anti-IgM-induced apoptosis but not cell death triggered by certain other stimuli.
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