Abstract
The t(5;17) variant of acute promeylocytic leukemia (APL) expresses a fusion of nucleophosmin (NPM) with the retinoic acid receptor alpha (RARA). We have previously shown that NPM-RAR is a binding partner of the tumor necrosis factor (TNF) receptor type-I-associated DEATH domain protein, TRADD. Binding of TNF to its receptor, TNF-R, induces recruitment of TRADD, and subsequent recruitment of a cascade of proteins that ultimate activate caspase 3, nuclear factor κB (NFκB) and c-Jun N-terminal kinase (JNK). We have previously shown that NPM-RAR interaction with TRADD blocks TNF activation of caspase 3, caspase 8, poly(ADP-ribose) polymerase (PARP) cleavage and, ultimately, apoptosis. We now report that NPM-RAR expression is permissive for TNF activation of NFκB and JNK. We propose that inhibition of TNF activation of apoptosis, while preserving TNF activation of NFκB and JNK pathways that stimulate cell growth and survival, represents a novel mechanism through which NPM-RAR contributes to development of the leukemic phenotype.
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