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Acute myeloid leukemia cell-derived extracellular vesicles carrying microRNA-548ac regulate hematopoietic function via the TRIM28/STAT3 pathway

Abstract

microRNAs (miRNAs or miRs) can be delivered from acute myeloid leukemia (AML) cells to hematopoietic stem cells (HSCs) to regulate hematopoietic function via extracellular vesicles (EVs). In this study, we investigated the roles played by EVs that transport miR-548ac from AML cells in normal hematopoiesis. Bioinformatics analysis demonstrated that miR-548ac was highly expressed in AML-derived EVs. The expression of miR-548ac and TRIM28 and the targeting relationship were identified, and the results demonstrated that the expression of miR-548ac was upregulated in AML cell lines and AML cell-secreted EVs compared with CD34+ HSCs. AML-derived EVs targeted CD34+ HSCs to induce decreased expression of TRIM28 and downstream activation of STAT3. Exosomal miR-548ac was transferred into CD34+ HSCs to target TRIM28. Through gain- and loss-of-function assays, it was observed that the abrogated expression of miR-548ac or STAT3 promoted colony-forming units (CFU), whereas overexpressed miR-548ac repressed CFU, which was rescued by overexpression of TRIM28. Taken together, these results indicated that miR-548ac delivered by AML cell-derived EVs inhibits hematopoiesis via TRIM28-dependent STAT3 activation.

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Fig. 1: miR-548ac is abundant in EVs derived from AML cells.
Fig. 2: EVs derived from AML HL-60 cells targeted HSCs.
Fig. 3: miR-548ac delivered by AML HL-60 cell-derived EVs targets HSCs.
Fig. 4: miR-548ac delivered by AML HL-60 cell-derived EVs may function in AML by targeting TRIM28.
Fig. 5: miR-548ac delivered by AML HL-60 cell-derived EVs inhibits hematopoietic function by targeting TRIM28.
Fig. 6: miR-548ac abrogates the hematopoietic function of CD34+ HSCs by TRIM28-activated STAT3.
Fig. 7: Silencing of miR-548ac in EVs inhibits the growth of AML stem cells in tumor xenograft models.
Fig. 8: Serum EV-derived miR-548ac can be used as a predictor of AML.
Fig. 9: Map depicting the mechanism by which miR-548ac from AML cell-released EVs affected the progression of AML.

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Funding

This work was supported by the Foundation of Science and Technology Department of Jilin Province (20190101006JH, 20200404175YY), Foundation of the Education Department of Jilin Province (no. JJKH20200462KJ), Foundation of Health and Family Planning Commission of Jilin Province (no. 2019J066), Foundation of the Administration of Traditional Chinese Medicine of Jilin Province (no. 2019138), Foundation of Suzhou Institute of medical engineering, Chinese Academy of Sciences-Jilin Science and technology cooperation project (no. E0550101), Jilin Collaborative Innovation Center for Antibody Engineering, Jilin Medical University (no. 20180623045TC).

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Correspondence to Ling Qi.

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Zhao, C., Zhao, Y., Zhao, J. et al. Acute myeloid leukemia cell-derived extracellular vesicles carrying microRNA-548ac regulate hematopoietic function via the TRIM28/STAT3 pathway. Cancer Gene Ther 29, 918–929 (2022). https://doi.org/10.1038/s41417-021-00378-6

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