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Combination of tyrosine kinase inhibitors and the MCL1 inhibitor S63845 exerts synergistic antitumorigenic effects on CML cells
Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden.
Department of Women’s and Children’s Health, Karolinska Institute, Stockholm, Sweden.
Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden.
Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden.
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2021 (Engelska)Ingår i: Cell Death and Disease, ISSN 2041-4889, E-ISSN 2041-4889, Vol. 12, nr 10, artikel-id 875Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Tyrosine kinase inhibitor (TKI) treatment has dramatically improved the survival of chronic myeloid leukemia (CML) patients, but measurable residual disease typically persists. To more effectively eradicate leukemia cells, simultaneous targeting of BCR-ABL1 and additional CML-related survival proteins has been proposed. Notably, several highly specific myeloid cell leukemia 1 (MCL1) inhibitors have recently entered clinical trials for various hematologic malignancies, although not for CML, reflecting the insensitivity of CML cell lines to single MCL1 inhibition. Here, we show that combining TKI (imatinib, nilotinib, dasatinib, or asciminib) treatment with the small-molecule MCL1 inhibitor S63845 exerted strong synergistic antiviability and proapoptotic effects on CML lines and CD34+ stem/progenitor cells isolated from untreated CML patients in chronic phase. Using wild-type BCR-ABL1-harboring CML lines and their T315I-mutated sublines (generated by CRISPR/Cas9-mediated homologous recombination), we prove that the synergistic proapoptotic effect of the drug combination depended on TKI-mediated BCR-ABL1 inhibition, but not on TKI-related off-target mechanisms. Moreover, we demonstrate that colony formation of CML but not normal hematopoietic stem/progenitor cells became markedly reduced upon combination treatment compared to imatinib monotherapy. Our results suggest that dual targeting of MCL1 and BCR-ABL1 activity may efficiently eradicate residual CML cells without affecting normal hematopoietic stem/progenitors.

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Springer Nature, 2021. Vol. 12, nr 10, artikel-id 875
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Hematologi Cancer och onkologi
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URN: urn:nbn:se:umu:diva-188158DOI: 10.1038/s41419-021-04154-0ISI: 000699036200007Scopus ID: 2-s2.0-85115671817OAI: oai:DiVA.org:umu-188158DiVA, id: diva2:1601046
Tillgänglig från: 2021-10-06 Skapad: 2021-10-06 Senast uppdaterad: 2022-05-05Bibliografiskt granskad

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