Summary
B cell response to antigens forms the basis for humoral immune responses. Mature B cells are rescued from spontaneous apoptosis in the presence of survival factors such as anti-IgM antibody, LPS, and anti-CD40 antibody. This in vitro rescue correlates with in vivo B-cell proliferation and differentiation induced by thymus-independent (TI) -2, TI-1, and thymus-dependent (TD) antigens. Crosslinking of B cell receptor (BCR) by anti-IgM antibody promotes a positive feedback loop in the vicinity of BCR to activate those tyrosine kinases, Syk and Btk, crucial for the NF-γB activation. Ligation of CD40 triggers a recruitment of IγB kinase through TNF receptor-activated factors (TRAFs). Sphingolipid- and cholesterol-enriched membrane domains are important for the assembly of the signaling molecules during TI-2 and TD antigens recognition. B cells can be rescued from apoptosis even in the absence of antigen by an agonistic antibody (anti-CD38 antibody), CS/2. An absolute requirement of Syk and Btk in the CS/2 action suggests that an intracellular signaling pathway of CS/2 is similar to that induced by BCR-crosslinking. However, the action of CS/2 does not elicit appreciable tyrosine phosphorylation. Our data implies that CS/2 induces a conformational change of CD38 within the membrane domains, which leads to a generation of sphingolipid-mediated B cell survival signal.
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© 2006 Springer-Verlag Tokyo
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Yokoyama, M. et al. (2006). Roles of Membrane Domains in the Signaling Pathway for B Cell Survival. In: Hirabayashi, Y., Igarashi, Y., Merrill, A.H. (eds) Sphingolipid Biology. Springer, Tokyo. https://doi.org/10.1007/4-431-34200-1_18
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DOI: https://doi.org/10.1007/4-431-34200-1_18
Publisher Name: Springer, Tokyo
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