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The FASEB Journal, Vol 5, 2770-2776, Copyright © 1991 by The Federation of American Societies for Experimental Biology

REVIEWS

T helper cell-dependent B cell activation

RJ Noelle and EC Snow
Department of Microbiology, Dartmouth Medical School, Hanover, New Hampshire 03756.

Small, resting B lymphocytes are driven into the cell cycle as a consequence of receiving multiple signals from elements found within their local environment. The first of these signals results from the binding of specific antigen to membrane immunoglobulin (mIg) receptors on the B cells. Pursuant to antigen binding, signals are transduced and the B cell commences to endocytose and degrade the antigen. Fragments of the antigen are expressed on the B cell surface in noncovalent association with class II major histocompatibility complex (MHC) molecules. The antigen-class II MHC complex serves as a recognition complex for CD4+ helper T cells (Th). As a consequence of recognition, Th form stable physical conjugates with the B cells. Over an extended period of time the Th and B cells bilaterally signal one another. This interchange of signals results in the growth and differentiation of both cells. This review will discuss the sequence of events that culminate in the growth and differentiation of B lymphocytes to antibody-producing cells.


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Copyright © 1991 by The Federation of American Societies for Experimental Biology.