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Liang, Kaiwei; Volk, Andrew G.; Haug, Jeffrey S.; Marshall, Stacy A.; Woodfin, Ashley R.; Bartom, Elizabeth T.; Gilmore, Joshua M.; Florens, Laurence; Washburn, Michael P.; Sullivan, Kelly D.; Espinosa, Joaquin M.; Cannova, Joseph; Zhang, Jiwang; Smith, Edwin R.; Crispino, John D.; Shilatifard, Ali
Cell, 01/2017, Letnik: 168, Številka: 1-2Journal Article
Chromosomal translocations of the mixed-lineage leukemia (MLL) gene with various partner genes result in aggressive leukemia with dismal outcomes. Despite similar expression at the mRNA level from the wild-type and chimeric MLL alleles, the chimeric protein is more stable. We report that UBE2O functions in regulating the stability of wild-type MLL in response to interleukin-1 signaling. Targeting wild-type MLL degradation impedes MLL leukemia cell proliferation, and it downregulates a specific group of target genes of the MLL chimeras and their oncogenic cofactor, the super elongation complex. Pharmacologically inhibiting this pathway substantially delays progression, and it improves survival of murine leukemia through stabilizing wild-type MLL protein, which displaces the MLL chimera from some of its target genes and, therefore, relieves the cellular oncogenic addiction to MLL chimeras. Stabilization of MLL provides us with a paradigm in the development of therapies for aggressive MLL leukemia and perhaps for other cancers caused by translocations. Display omitted •UBE2O acts downstream of the interleukin-1 pathway to regulate MLL/COMPASS stability•Stabilizing wild-type MLL protein inhibits MLL leukemia cell proliferation•UBE2O and IRAK inhibition alters a common set of MLL chimera target genes•Targeting the IL-1 pathway is a potential therapeutic strategy for MLL leukemia Stabilizing wild-type MLL proteins is a potential therapeutic approach for leukemia resulting from MLL translocations.
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in: SICRIS
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