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The Journal of Immunology, Vol 156, Issue 6 2143-2154, Copyright © 1996 by American Association of Immunologists

ARTICLES

Regulation of B cell survival in xid mice by the proto-oncogene bcl-2

RT Woodland, MR Schmidt, SJ Korsmeyer and KA Gravel
University of Massachusetts Medical School, Worcester 01655, USA.

CBA/N mice carry an X-linked immunodeficiency (xid) due to a point mutation in the Bruton's tyrosine kinase (btk) gene. xid mice have a smaller peripheral B cell pool than normal animals, lack CD5+ B cells (B1), and are hyporesponsive to mitogenic anti-Igs and thymus- independent type 2 Ags. The proto-oncogene bcl-2 affects B cell homeostasis by suppressing programmed cell death. We hypothesized that reduced bcl-2 expression could enhance programmed cell death in xid B cells, directly causing poor peripheral B cell survival and indirectly affecting Ag responsiveness. We measured and compared levels of endogenous Bcl-2 protein and spontaneous apoptosis in xid and normal B cells, and determined the effect of a human bcl-2/Ig minigene on B cell survival and Ag responsiveness in bcl-2 transgenics. The amount of endogenous Bcl-2 was reduced fivefold in freshly isolated xid B cells compared with that in normal cells, but was equal in xid and normal T cells. Attrition by spontaneous apoptosis was significantly higher in cultured xid B cells. Expression of the bcl-2 transgene suppressed apoptosis equally in normal and xid B cells, prolonged in vitro survival, and markedly expanded in vivo the follicular B cell population normally reduced in xid mice. However, most xid defects persisted; xid/bcl-2 mice remained deficient in B1 cells and hyporesponsive to anti-Igs, thymus-independent type 1 Ags, and thymus- independent type 2 Ags. The data suggest that signal transduction pathways using Btk independently regulate B cell survival and Ag responsiveness.


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