MicroRNA-33b regulates sensitivity to daunorubicin in acute myelocytic leukemia by regulating eukaryotic translation initiation factor 5A-2.

In this study, we aimed to study the effect of miR-33b in regulating sensitivity to daunorubicin (DNR) in acute myelocytic leukemia (AML). We used quantitative real-time polymerase chain reaction and Cell Counting Kit-8 assay to detect the level of miR-33b and cell viability. Cell apoptosis and the expression of eIF5A-2 and MCL-1 protein were detected by flow cytometry analysis and Western Blot analysis, respectively. MiR-33b mimic increased sensitivity of AML cells against DNR, while miR-33b inhibitor had the opposite effect. Furthermore, the results showed that the eIF5A-2 gene was a direct target of miR-33b, and miR-33b regulated eIF5A-2 mRNA and protein expression. Silencing of eIF5A-2 by RNA interference increased the sensitivity of AML cells against DNR. We also found that MCL-1 contributed to the regulation of DNR sensitivity, which was dependent on downregulation of eIF5A-2. Finally, knockdown of eIF5A-2 eliminated the effects of miRNA-33b mimic or inhibitor on DNR sensitivity. These findings indicate that miR-33b maybe as a new therapeutic target in AML cells. © 2019 Wiley Periodicals, Inc.

Citation

Yanhui Liu, Pingchong Lei, Hong Qiao, Kai Sun, Xiling Lu, Fengchang Bao, Runhong Yu, Cheng Lian, Yao Li, Wei Chen, Fei Xue. MicroRNA-33b regulates sensitivity to daunorubicin in acute myelocytic leukemia by regulating eukaryotic translation initiation factor 5A-2. Journal of cellular biochemistry. 2020 Jan;121(1):385-393

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PMID: 31222822

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