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Harold C. Simmons Arthritis Research Center and Departments of Internal Medicine,
Pharmacology, and
Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235
CD40 engagement induces a variety of functional outcomes following
association with adaptor molecules of the TNF receptor-associated
factor (TRAF) family. Whereas TRAF2, -5, and -6 initiate NF-
B
activation, the outcomes of TRAF3-initiated signaling are less
characterized. To delineate CD40-induced TRAF3-dependent events, Ramos
B cells stably transfected with a dominant negative TRAF3 were
stimulated with membranes expressing recombinant CD154/CD40 ligand. In
the absence of TRAF3 signaling, activation of p38 and control of Ig
production were abrogated, whereas Jun N-terminal kinase activation and
secretion of IL-10, lymphotoxin-
, and TNF-
were partially
blocked. By contrast, induction of apoptosis, activation of NF-
B,
generation of granulocyte-macrophage CSF, and up-regulation of CD54,
MHC class II, and CD95 were unaffected by the TRAF3 dominant negative.
Together, these results indicate that TRAF3 initiates independent
signaling pathways via p38 and JNK that are associated with specific
functional outcomes.
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