Induction of murine B cell proliferation by insolubilized anti-immunoglobulins

This study demonstrates that intact antibodies specific for μ, δ, or light chains when coupled to Sepharose are effective in delivering proliferative signals to B cells. Furthermore, using Sepharose-coupled anti-δ antibodies, we have shown that hybridoma anti-δ (that is not active as soluble protein) is as effective as rabbit anti-δ in activating murine B cells. However, antibodies directed against two other surface molecules, I-A and H-2K, were not mitogenic. Thus, sIgM and sIgD are comparable in their ability to transmit a proliferative signal to the B cell and sIg seems to play a unique role in this regard.