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After activation by anti-mu antibody human B cells acquire the ability to proliferate in the presence of recombinant interleukin 2 (IL 2), a 20-kDa mol. mass B cell growth factor (BCGF) and a high mol. mass BCGF (50-kDa BCGF). An anti-IL 2 receptor (IL 2R) monoclonal antibody inhibits the IL 2-dependent proliferation without affecting that induced by BCGF. B cells expressing the IL 2R after anti-mu antibody activation (IL 2R+ cells) were separated from those not expressing IL 2R (IL 2R- cells). IL 2 stimulated the proliferation of only IL 2R+ cells whereas the 20-kDa BCGF acted on both IL 2R+ and IL 2R- cells. Importantly, the 50-kDa BCGF supported the proliferation of IL 2R- cells whereas it was inactive on IL 2R+ cells. Thus, the B cell subset responding to the 50-kDa BCGF after anti-mu antibody activation is distinct from that responding to IL 2.
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