alexa Transplanted long-term cultured pre-BI cells expressing calpastatin are resistant to B cell receptor-induced apoptosis.


Journal of Clinical & Cellular Immunology

Author(s): RuizVela A, Serrano F, Gonzlez MA, Abad JL, Bernad A,

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Abstract Long-term cultured pre-B cells are able to differentiate into immunoglobulin (Ig)M-positive B cells (IgM(+) cells) when transplanted into severe combined immunodeficient (SCID) mice. Based on previous studies, here we report the development of a reconstitution assay in nonobese diabetic/SCID (NOD/SCID) mice using pre-B cells, which allows us to study the role of calpains (calcium-activated endopeptidases) during B cell development as well as in B cell clonal deletion. Using this model, we show that calpastatin (the natural inhibitor of calpains) inhibits B cell receptor-induced apoptosis in IgM(+) cells derived from transplanted mice. We thus hypothesize an important function for calpain in sculpting the B cell repertoire.
This article was published in J Exp Med and referenced in Journal of Clinical & Cellular Immunology

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