Abstract
Monoclonal anti-Ia antibodies enhanced anti-μ induced proliferation of murine B lymphocytes. Anti-Ia induced augmentation of B cell proliferation was allele specific and did not require participation by T cells and adherent cells. The effects of anti-Ia antibodies on B cell activation are neither due to induction of interleukin-1 secretion in the cultures nor due to interaction with the Fc receptors and can be demonstrated under serum-free culture conditions. Monoclonal antibodies against both IA and IE region encoded Ia molecules were able to synergize with anti-μ in inducing B cell proliferation. Antibodies to both IA and IE coded antigens induced IgM secretion from the B lymphoma cell lines BKS3 and BKL. The anti-Ia antibodies did not affect the proliferation of the B lymphoma cells. These results suggest that the interaction of B cell surface Ia with the anti-Ia antibodies results in an activation signal and that the B cell surface Ia antigens may function as signal transducer molecules.
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