American Association for Cancer Research
15417786mcr140080-sup-126730_1_supp_2516273_n72ph3.docx (41.11 kB)

Data Supplement from Extrinsic Apoptosis Is Impeded by Direct Binding of the APL Fusion Protein NPM-RAR to TRADD

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journal contribution
posted on 2023-04-03, 16:28 authored by Anuja Chattopadhyay, Brian L. Hood, Thomas P. Conrads, Robert L. Redner

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A subset of acute promyelocytic leukemia (APL) cases has been characterized by the t(5;17)(q35;q21) translocation variant, which fuses nucleophosmin (NPM) to retinoic acid receptor α (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. TNF receptor type I–associated DEATH domain protein (TRADD) was identified as a relevant binding partner for NPM-RAR. This interaction was validated by coprecipitation and colocalization analysis. Biologic 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 affects leukemogenesis. Mol Cancer Res; 12(9); 1283–91. ©2014 AACR.