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- W2912682470 abstract "Abstract Acute promyelocytic leukemia (APL) is often associated with activating FLT3 signaling mutations. These are highly related to hyperleukocytosis, a major adverse risk factor with chemotherapy-based regimens. APL is a model for oncogene-targeted therapies: all-trans retinoic acid (ATRA) and arsenic both target and degrade its ProMyelocytic Leukemia/Retinoic Acid Receptor α (PML/RARA) driver. The combined ATRA/arsenic regimen now cures virtually all patients with standard-risk APL. Although FLT3-internal tandem duplication (ITD) was an adverse risk factor for historical ATRA/chemotherapy regimens, the molecular bases for this effect remain unknown. Using mouse APL models, we unexpectedly demonstrate that FLT3-ITD severely blunts ATRA response. Remarkably, although the transcriptional output of initial ATRA response is unaffected, ATRA-induced PML/RARA degradation is blunted, as is PML nuclear body reformation and activation of P53 signaling. Critically, the combination of ATRA and arsenic fully rescues therapeutic response in FLT3-ITD APLs, restoring PML/RARA degradation, PML nuclear body reformation, P53 activation, and APL eradication. Moreover, arsenic targeting of normal PML also contributes to APL response in vivo. These unexpected results explain the less favorable outcome of FLT3-ITD APLs with ATRA-based regimens, and stress the key role of PML nuclear bodies in APL eradication by the ATRA/arsenic combination." @default.
- W2912682470 created "2019-02-21" @default.
- W2912682470 creator A5005020812 @default.
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- W2912682470 creator A5020761649 @default.
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- W2912682470 creator A5069459558 @default.
- W2912682470 creator A5076016832 @default.
- W2912682470 creator A5091516967 @default.
- W2912682470 date "2019-03-28" @default.
- W2912682470 modified "2023-10-16" @default.
- W2912682470 title "FLT3-ITD impedes retinoic acid, but not arsenic, responses in murine acute promyelocytic leukemias" @default.
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