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Autophagic degradation of an oncoprotein


, : Autophagic degradation of an oncoprotein. Autophagy 6(7): 964-965

Acute promyelocytic leukemia (APL) is characterized by a chromosomal t(15;17) translocation that fuses the gene encoding the promyelocytic leukemia protein (PML) to that encoding retinoic acid receptor alpha (RARA). The product of this genetic aberration, the PML/RARA fusion protein, is highly oncogenic and supports malignant transformation and growth of hematopoietic precursor cells at the promyelocytic stage of differentiation. Successful treatment of APL by all-trans retinoic acid (ATRA) or arsenic trioxide (ATO) depends on the ability of these drugs to induce proteolytic degradation of this chimeric protein. In a recently published study we demonstrate that PML/RARA is amenable for degradation by autophagy and that ATRA- and ATO-induced PML/RARA degradation is autophagy-dependent. Consequently, autophagic degradation regulates basal turnover as well as therapy-induced elimination of this oncoprotein. In addition, our study reveals an important role of autophagy in promoting granulocytic differentiation of APL cells.

US$19.90

PMID: 20724820

DOI: 10.4161/auto.6.7.13066


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