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From the * Ontario Cancer Institute, Departments of Medical Biophysics and Immunology, Toronto,
Ontario M5G 2M9, Canada; and the Tumor necrosis factor receptor (TNFR)-associated factor 2 (TRAF2) and TRAF1 were found
as components of the TNFR2 signaling complex, which exerts multiple biological effects on
cells such as cell proliferation, cytokine production, and cell death. In the TNFR2-mediated
signaling pathways, TRAF2 works as a mediator for activation signals such as NF-
Howard Hughes Medical Institute and § The Rockefeller
University, New York 10021
B, but the
role of TRAF1 has not been previously determined. Here we show in transgenic mice that
TRAF1 overexpression inhibits antigen-induced apoptosis of CD8+ T lymphocytes. Our results demonstrate a biological role for TRAF1 as a regulator of apoptotic signals and also support the hypothesis that the combination of TRAF proteins in a given cell type determines distinct biological effects triggered by members of the TNF receptor superfamily.
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