All-trans retinoic acid exerts selective anti-FLT3-ITD acute myeloid leukemia efficacy through downregulating Chk1 kinase

Cancer Lett. 2020 Mar 31:473:130-138. doi: 10.1016/j.canlet.2019.12.045. Epub 2020 Jan 2.

Abstract

All-trans retinoic acid (ATRA) is known to be a potent inhibitor of FLT3-ITD acute myeloid leukemia (AML) cells, although the exact mechanism remains unclear. In this work, we report that ATRA causes fatal mitotic catastrophe in FLT3-ITD AML cells by degrading Chk1 kinase, and therefore preventing DNA damage repair. In order to explore a further enhancement in the inhibitory effect of ATRA on FLT3-ITD AML cells, we investigated the suitability of a combination of ATRA and DNA damage drug SN38. In vitro experiments showed that this combinatorial approach effectively inhibited the proliferation of FLT3-ITD cells and induced cell apoptosis in AML. In vivo experiments confirmed that the combination could substantially improve the anti-tumor effect of SN38. Taken together, our results indicate that ATRA down-regulates Chk1 in FLT3-ITD AML cells, and the combination of ATRA and SN38 significantly improves the anti-tumor effect of either ATRA or SN38 when used alone.

Keywords: ATRA; Acute myeloid leukemia; Combination therapy; DNA damage repair; SN38.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Animals
  • Antineoplastic Combined Chemotherapy Protocols / pharmacology*
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use
  • Apoptosis / drug effects
  • Apoptosis / genetics
  • Cell Line, Tumor
  • Checkpoint Kinase 1 / antagonists & inhibitors*
  • Checkpoint Kinase 1 / metabolism
  • Child, Preschool
  • DNA Damage / drug effects
  • DNA Repair / drug effects
  • Down-Regulation / drug effects
  • Drug Synergism
  • Gene Expression Regulation, Leukemic / drug effects*
  • Humans
  • Irinotecan / pharmacology
  • Irinotecan / therapeutic use
  • Leukemia, Myeloid, Acute / blood
  • Leukemia, Myeloid, Acute / drug therapy*
  • Leukemia, Myeloid, Acute / genetics
  • Leukemia, Myeloid, Acute / pathology
  • Male
  • Mice
  • Middle Aged
  • Mitosis / drug effects
  • Primary Cell Culture
  • Protein Kinase Inhibitors / pharmacology*
  • Protein Kinase Inhibitors / therapeutic use
  • Tandem Repeat Sequences / genetics
  • Topoisomerase I Inhibitors / pharmacology
  • Topoisomerase I Inhibitors / therapeutic use
  • Tretinoin / pharmacology*
  • Tretinoin / therapeutic use
  • Xenograft Model Antitumor Assays
  • fms-Like Tyrosine Kinase 3 / genetics

Substances

  • Protein Kinase Inhibitors
  • Topoisomerase I Inhibitors
  • Tretinoin
  • Irinotecan
  • FLT3 protein, human
  • fms-Like Tyrosine Kinase 3
  • CHEK1 protein, human
  • Checkpoint Kinase 1