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,
*
Department of Microbiology and Immunology, Temple University School of Medicine, Philadelphia, PA 19140; and
Tumor Immunology Program, German Cancer Research Center, Heidelberg, Germany
Current address: Ben May Institute for Cancer Research, University
of Chicago, Chicago, IL 60637.
In this study the mechanism of differential sensitivity of CD3-activated Th1- and Th2-type cells to Fas-mediated apoptosis was explored. We show that the Fas-associated death domain protein (FADD)/caspase-8 pathway is differentially regulated by CD3 activation in the two subsets. The apoptosis resistance of activated Th2-type cells is due to an incomplete processing of caspase-8 at the death-inducing signaling complex (DISC) whereas recruitment of caspase-8 to the DISC of Th1- and Th2-like cells is comparable. Activation of phosphatidylinositol 3'-kinase upon ligation of CD3 in Th2-type cells blocked caspase-8 cleavage to its active fragments at the DISC, thereby preventing induction of apoptosis. This study offers a new pathway for phosphatidylinositol 3'-kinase in mediating protection from Fas-induced apoptosis.
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