Abstract
Leukemia stem cells (LSCs) are considered to be the root of relapse for acute myeloid leukemia (AML). Conventional chemotherapeutic drugs fail to eliminate LSCs. Therefore, new therapeutic strategies eliminating LSCs are urgently needed. Our results showed that low-dose Triptolide (TPL) enhanced the anti-AML activity of Idarubicin (IDA) in vitro against LSC-like cells (CD34 + CD38- KG1αand CD34 + CD38- kasumi-1 cells) and CD34+ primary AML cells, while sparing normal cells. Inspiringly, the combination treatment with low-dose TPL and IDA was also effective against CD34 + blasts from AML patients with FLT3-ITD mutation, which is an unfavorable risk factor for AML patients. Moreover, the combination of TPL and IDA induced a remarkable suppression of human leukemia growth in a xenograft mouse model. Mechanistically, the enhanced effect of low dose TPL on IDA against LSCs was attributed to inhibiting DNA damage repair response. Thus, our study may provide a theoretical basis to facilitate the development of a novel LSCs-targeting strategy for AML.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Funding
This work was financially supported by National Nature Science Foundation of China, PR China (Grant No.81570156, No.81570425, No. 81770126 and N0. 81700156). Prof. Pengcheng Shi, Young Scientists Fund (No. 81700156). Prof. Bing Xu, National Natural Science Foundation of China (No.81570156, No.81570425, No. 81770126).
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Conception and design: Pengcheng Shi, Jie Zha, Juan Feng, Yirong Jiang, Haihan Song, Bing Xu. Acquisition, analysis and interpretation of data: Pengcheng Shi, Jie Zha, Juan Feng, Bing Xu. Development of methodology: Pengcheng Shi, Jie Zha, Juan Feng, Zhiwu Jiang, Haijun Zhao. Primary samples collection and purification and validation: Pengcheng Shi, Manman Deng, Naying Liao. Animal model analysis and data collection: Pengcheng Shi, Zhiwu Jiang, Peng Li. Writing, and revision of the manuscript: Pengcheng Shi, Jie Zha, Juan Feng, Yirong Jiang, Haihan Song, Bing Xu. Supplemental experiments: Pengchengshi and Jie zha. Response to reviewers: Pengchengshi, Jiezha and Bing Xu.
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This study was carried out in accordance with the Declaration of Helsinki, and approved by the Ethics Review Board of Nanfang Hospital.
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Bone marrow aspirates of AML patients and peripheral blood of healthy donors were obtained with the informed consent for research purposes.
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Shi, P., Zha, J., Feng, J. et al. Low-Dose Triptolide Enhanced Activity of Idarubicin Against Acute Myeloid Leukemia Stem-like Cells Via Inhibiting DNA Damage Repair Response. Stem Cell Rev and Rep 17, 616–627 (2021). https://doi.org/10.1007/s12015-020-10054-1
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DOI: https://doi.org/10.1007/s12015-020-10054-1