Role of Fas-mediated cell death in the regulation of immune responses.

Interaction of the cell-surface molecule Fas (CD95 APO-1) with its specific ligand triggers apoptotic death of T and B lymphocytes. This pathway is important for eliminating self-reactive lymphocytes and thus preventing autoimmunity. Fas is also involved in controlling injurious lymphocyte reactions in immunologically 'privileged' tissues, and may provide a strategy for reducing graft rejection.