The Fas receptor (also known as CD95 and APO-1) is a member of the tumor necrosis factor α-family of death receptors that mediate T-cell responses. Here, we show that Fas receptor signaling requires a functional T-cell receptor (TCR) complex. Fas receptor directly binds to and activates TCR components in a stimulus-dependent manner. Fas receptor stimulation does not activate canonical downstream TCR pathways, but instead the TCR complex is required specifically for Fas-mediated calcium release. Importantly, null mutations in Lck, ZAP70, and the TCR α- and β-chains abrogate Fas signaling. Our results reveal a direct role for the TCR complex in mediating Fas-specific signaling events critical for T-cell homeostasis.
|Number of pages
|Proceedings of the National Academy of Sciences of the United States of America
|Published - Aug 24 2010
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