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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mol+Cancer+Res 2014 ; 12 (9): 1283-91 Nephropedia Template TP
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Extrinsic Apoptosis is Impeded by Direct Binding of the APL Fusion Protein NPM-RAR to TRADD #MMPMID25033841
Chattopadhyay A; Hood BL; Conrads TP; Redner RL
Mol Cancer Res 2014[Sep]; 12 (9): 1283-91 PMID25033841show ga
A subset of acute promyelocytic leukemia (APL) cases have been characterized by the t(5;17)(q35;q21) translocation variant which fuses nucleophosmin (NPM) to retinoic acid receptor alpha (RARA). The resultant NPM-RAR fusion protein blocks myeloid differentiation, and leads to a leukemic phenotype similar to that caused by the t(15;17)(q22;q21) PML-RAR fusion. The contribution of the N-terminal 117 amino acids of NPM contained within NPM-RAR has not been well studied. As a molecular chaperone, NPM interacts with a variety of proteins implicated in leukemogenesis. Therefore, a proteomic analysis was conducted to identify novel NPM-RAR associated proteins. Tumor necrosis factor receptor type 1-associated DEATH domain protein (TRADD) was identified as a relevant binding partner for NPM-RAR. This interaction was validated by co-precipitation and co-localization analysis. Biological assessment found that NPM-RAR expression impaired TNF-induced signaling through TRADD, blunting TNF-mediated activation of caspase 3 (CASP3) and caspase 8 (CASP8), to ultimately block apoptosis.Implications: This study identifies a novel mechanism through which NPM-RAR impacts leukemogenesis.