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Learn MoreThe combination of venetoclax with azacitidine (ven/aza) has recently emerged as a promising regimen for acute myeloid leukemia (AML), with approximately 70% of newly diagnosed patients achieving complete remission (CR). However, 30% of newly diagnosed and nearly all relapsed patients do not achieve CR with ven/aza. Mechanistically, we previously reported that ven/aza efficacy is based on eradication of AML stem cells through a mechanism involving inhibition of amino acid metabolism, a process which is required in primitive AML cells to drive oxidative phosphorylation. In the present study we demonstrate that resistance to ven/aza occurs as a consequence of up-regulated fatty acid oxidation (FAO), which occurs either as an intrinsic property of RAS pathway mutations, or as a compensatory adaptation in relapsed disease. Utilization of FAO obviates the need for amino acid metabolism into the TCA cycle, thereby rendering ven/aza ineffective. Importantly, we show that pharmacological inhibition of FAO via use of MCL-1 or CPT1 inhibitor drugs restores targeting of ven/aza resistant AML stem cells. Based on these findings we propose that inhibition of FAO is a potential therapeutic strategy to address ven/aza resistance. SOURCE: Brett Stevens (brett.stevens@ucdenver.edu) - Jordan Lab University of Colorado
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