Targeting quiescent leukemic stem cells using second generation autophagy inhibitors.

Targeting quiescent leukemic stem cells using second generation autophagy inhibitors.
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DOI:
10.1038/s41375-018-0252-4
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发表时间:
2019-04
期刊:
影响因子:
11.4
通讯作者:
Helgason GV
Helgason GV
中科院分区:
医学1区
文献类型:
--
作者:
Baquero P;Dawson A;Mukhopadhyay A;Kuntz EM;Mitchell R;Olivares O;Ianniciello A;Scott MT;Dunn K;Nicastri MC;Winkler JD;Michie AM;Ryan KM;Halsey C;Gottlieb E;Keaney EP;Murphy LO;Amaravadi RK;Holyoake TL;Helgason GV

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In chronic myeloid leukemia (CML), tyrosine kinase inhibitor (TKI) treatment induces autophagy that promotes survival and TKI-resistance in leukemic stem cells (LSCs). In clinical studies hydroxychloroquine (HCQ), the only clinically approved autophagy inhibitor, does not consistently inhibit autophagy in cancer patients, so more potent autophagy inhibitors are needed. We generated a murine model of CML in which autophagic flux can be measured in bone marrow-located LSCs. In parallel, we use cell division tracing, phenotyping of primary CML cells, and a robust xenotransplantation model of human CML, to investigate the effect of Lys05, a highly potent lysosomotropic agent, and PIK-III, a selective inhibitor of VPS34, on the survival and function of LSCs. We demonstrate that long-term haematopoietic stem cells (LT-HSCs: Lin−Sca-1+c-kit+CD48−CD150+) isolated from leukemic mice have higher basal autophagy levels compared with non-leukemic LT-HSCs and more mature leukemic cells. Additionally, we present that while HCQ is ineffective, Lys05-mediated autophagy inhibition reduces LSCs quiescence and drives myeloid cell expansion. Furthermore, Lys05 and PIK-III reduced the number of primary CML LSCs and target xenografted LSCs when used in combination with TKI treatment, providing a strong rationale for clinical use of second generation autophagy inhibitors as a novel treatment for CML patients with LSC persistence.
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