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The Fas-associated death domain (FADD) protein mediates apoptosis by coupling death receptors with the caspase cascade. Paradoxically, it also promotes cell mitosis through its C-terminal region. Apoptosis and mitosis are opposing processes that can have radically different consequences. To determine which of the FADD effects prevails in T cell-mediated autoimmune diseases, we studied myelin oligodendrocyte glycoprotein-induced experimental autoimmune encephalomyelitis (EAE) using mice that express a dominant-negative FADD (FADD-DN) transgene in the T cell lineage. We found that FADD blockade in T cells prevented the development of autoimmune encephalomyelitis and inhibited both Th1 and Th2 type responses. Myelin oligodendrocyte glycoprotein-specific T cell proliferation was also dramatically reduced in FADD-DN mice despite the resistance of T cells to activation-induced cell death. These results indicate that although FADD expressed by T cells is involved in regulating both mitosis and apoptosis, its effect on mitosis prevails in EAE, and that strategies inhibiting FADD functions in T cells could be effective in preventing the disease.

Essential Roles of the Fas-Associated Death Domain in Autoimmune Encephalomyelitis