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.
Copyright © 2020 Elsevier B.V. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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Aged
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Animals
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Antineoplastic Combined Chemotherapy Protocols / pharmacology*
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Antineoplastic Combined Chemotherapy Protocols / therapeutic use
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Apoptosis / drug effects
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Apoptosis / genetics
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Cell Line, Tumor
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Checkpoint Kinase 1 / antagonists & inhibitors*
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Checkpoint Kinase 1 / metabolism
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Child, Preschool
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DNA Damage / drug effects
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DNA Repair / drug effects
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Down-Regulation / drug effects
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Drug Synergism
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Gene Expression Regulation, Leukemic / drug effects*
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Humans
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Irinotecan / pharmacology
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Irinotecan / therapeutic use
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Leukemia, Myeloid, Acute / blood
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Leukemia, Myeloid, Acute / drug therapy*
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Leukemia, Myeloid, Acute / genetics
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Leukemia, Myeloid, Acute / pathology
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Male
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Mice
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Middle Aged
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Mitosis / drug effects
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Primary Cell Culture
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Protein Kinase Inhibitors / pharmacology*
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Protein Kinase Inhibitors / therapeutic use
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Tandem Repeat Sequences / genetics
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Topoisomerase I Inhibitors / pharmacology
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Topoisomerase I Inhibitors / therapeutic use
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Tretinoin / pharmacology*
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Tretinoin / therapeutic use
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Xenograft Model Antitumor Assays
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fms-Like Tyrosine Kinase 3 / genetics
Substances
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Protein Kinase Inhibitors
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Topoisomerase I Inhibitors
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Tretinoin
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Irinotecan
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FLT3 protein, human
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fms-Like Tyrosine Kinase 3
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CHEK1 protein, human
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Checkpoint Kinase 1