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The immune function of B lymphocytes from 12 patients with nonneoplastic immune-mediated diseases receiving chronic low-dose (2 mg/kg per d) cyclophosphamide (CY) was evaluated. There was a selective and differential suppressive effect of CY therapy on the various stages of the B cell cycle including activation, proliferation, and differentiation. The proliferative responses to Staphylococcus aureus Cowan strain I (SAC) and mitogenic concentrations of anti-mu were suppressed. In contrast, B cells that have been presumably activated in vivo proliferated with a normal pattern when exposed to B cell growth factor in vitro. Chronic low-dose CY therapy also suppressed B cell differentiation. Secretion of immunoglobulin by B cells following in vitro triggering with SAC and a T cell supernatant was suppressed in CY-treated patients. Moreover, differentiation of the large in vivo-activated B cells (which do not require an in vitro activation signal) in the presence of appropriate T lymphocyte supernatant was also suppressed. This selective suppression of B cell function at multiple points in the B cell cycle may be responsible for the efficacy of CY therapy in certain antibody and immune complex-mediated diseases.

Selective effects of cyclophosphamide therapy on activation, proliferation, and differentiation of human B cells.