TRAF1 is an adaptor protein in TNF receptor superfamily signaling that modulates NF-κB, MAPK, and apoptotic pathways. Unlike other TRAFs, TRAF1 lacks intrinsic E3 ubiquitin ligase activity, acting instead as a regulatory scaffold. In cancer, TRAF1 is best viewed as a pro-survival, anti-apoptotic signal amplifier, especially in immune-related and hematologic malignancies.
Expression Pattern in Cancer
-Low or absent in most normal tissues
-Inducible by NF-κB
-Overexpressed in many cancers, especially:
-B-cell lymphomas (CLL, Hodgkin lymphoma, DLBCL)
-Multiple myeloma
-Some solid tumors with inflammatory microenvironments
-High TRAF1 expression correlates with:
-Therapy resistance
-Immune-evasive phenotypes
-Poor prognosis (context-dependent)
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