We established a novel monoclonal antibody, RP/14, that can protect B cells from apoptosis induced by irradiation or dexamethasone. A molecule recognized by RP/14 (the RP antigen) was expressed on B cells with B220bright, IgMdull, and IgDbright. Immunoprecipitation experiments revealed that RP/14 recognized a monomeric protein with an approximate molecular mass of 105 kD. Stimulation of B cells with RP/14 for 48 h induced B cell proliferation and blastogenesis. In contrast to B cells of wild-type mice, X-linked immunodeficient (XID) B cells did not proliferate upon stimulation with RP/14, although the RP antigen was expressed to the same extent as that of wild-type B cells. These results suggest that the RP antigen-mediated signaling pathway is important for rescuing B cells from apoptosis and is deficient in XID B cells.
Murine B cell proliferation and protection from apoptosis with an antibody against a 105-kD molecule: unresponsiveness of X-linked immunodeficient B cells.
K Miyake, Y Yamashita, Y Hitoshi, K Takatsu, M Kimoto; Murine B cell proliferation and protection from apoptosis with an antibody against a 105-kD molecule: unresponsiveness of X-linked immunodeficient B cells.. J Exp Med 1 October 1994; 180 (4): 1217–1224. doi: https://doi.org/10.1084/jem.180.4.1217
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