Signal Transduction and the Coordination of b Lymphocyte Development and Function I(Springer Verlag Gmbh) - Justement Louis B.,Siminovitch Katherine A.
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Signal Transduction and the Coordination of b Lymphocyte Development and Function I(Springer Verlag Gmbh)
Justement Louis B.,Siminovitch Katherine A.
Synopsis "Signal Transduction and the Coordination of b Lymphocyte Development and Function I(Springer Verlag Gmbh)"
Proper development and differentiation of B lymphocytes is es- sential to ensure that an organism has the ability to mount an effective humoral immune response against foreign antigens. The immune system must maintain a balance between the deletion of harmful self-reactive B cells and the generation of a diverse rep- ertoire of B cells that has the ability to recognize an almost un- limited array of foreign antigens. The need to delete self-reactive cells is tempered by the need to avoid the generation of large functional holes in the repertoire of foreign antigen-specific B cells that patrol the periphery. To accomplish this, the immune system must reach a compromise by eliminating only the most dangerous autoreactive clones, while allowing less harmful au- toreactive B cells to exist in the periphery where they may com- plement the organism's ability to mount a rapid response against invading micro-organisms. Those autoreactive cells that do enter the peripheral pool are subject to a number of conditional re- straints that effectively attenuate their ability to respond to self- antigens. Deleterious alterations in the homeostasis between tolerance induction and recruitment of B cells into the functional repertoire may lead to increased susceptibility to autoimmune disease or infection, respectively. Therefore, delineation of the molecular processes that maintain immunological homeostasis in the B cell compartment is critical.