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TNFR-associated death domain protein (TRADD) is a key effector protein of TNFR1 signaling. However, the role of TRADD in other death receptor (DR) signaling pathways, including DR3, has not been completely characterized. Previous studies using overexpression systems suggested that TRADD is recruited to the DR3 complex in response to the DR3 ligand, TNF-like ligand 1A (TL1A), indicating a possible role in DR3 signaling. Using T cells from TRADD knockout mice, we demonstrate in this study that the response of both CD4(+) and CD8(+) T cells to TL1A is dependent upon the presence of TRADD. TRADD knockout T cells therefore lack the appropriate proliferative response to TL1A. Moreover, in the absence of TRADD, both the stimulation of MAPK signaling and activation of NF-κB in response to TL1A are dramatically reduced. Unsurprisingly, TRADD is required for recruitment of receptor interacting protein 1 and TNFR-associated factor 2 to the DR3 signaling complex and for the ubiquitination of receptor interacting protein 1. Thus, our findings definitively establish an essential role of TRADD in DR3 signaling.

The Adaptor Protein TRADD Is Essential for TNF-Like Ligand 1A/Death Receptor 3 Signaling