The effect of B cell depletion on humoral responses during anit-CD20 mAb immunotherapy

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The full effects of B cell depletion on humoral immunity are largely unknown. To address this issue, mature B cells were depleted in mice using CD20 mAb. CD20^+ B cell depletion prevented humoral immune responses and class switching, and depleted B cell memory. Nonetheless, B cell depletion did not affect serum Ig levels, Ag-specific antibody titers, or bone marrow antibody-secreting plasma cell numbers. Thus, depleting mature and memory B cells does not have a dramatic negative effect on pre-existing antibody levels.