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MiR-20a-containing exosomes from umbilical cord mesenchymal stem cells alleviates liver ischemia/reperfusion injury
Authors:Lin Zhang  Yaolin Song  Lei Chen  Donghang Li  Haohao Feng  Zilong Lu  Tao Fan  Zubin Chen  Man J Livingston  Qing Geng
Institution:1. Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan, Hubei, China

Lin Zhang and Yaolin Song contributed equally to this study.;2. Department of Thoracic Surgery, Ezhou Central Hospital, Ezhou, Hubei, China

Lin Zhang and Yaolin Song contributed equally to this study.;3. Department of Thoracic Surgery, Renmin Hospital of Wuhan University, Wuhan, Hubei, China;4. Department of Hepatological Surgery, Renmin Hospital of Wuhan University, Wuhan, Hubei, China;5. Department of Cellular Biology and Anatomy, Augusta University, Augusta, Georgia

Abstract:Mesenchymal stem cells (MSCs) have been proved to exert considerable therapeutic effects on ischemia-reperfusion (I/R)-induced injury, but the underlying mechanism remains unknown. In this study, we aimed to explore the potential molecular mechanism underlying the therapeutic effect of MSCs-derived exosome reinforced with miR-20a in reversing liver I/R injury. Quantitative real-time polymerase chain reaction, Western blot, and IHC were carried out to compare the differential expressions of miR-20a, Beclin-I, FAS, Caspase-3, mTOR and P62 in IR rats and normal rats. TUNEL was performed to assess IR-induced apoptosis in IR rats, and luciferase assay was used to confirm the inhibitory effect of miR-20a on Beclin-I and FAS expression. Among the 12 candidate microRNAs (miRNAs), miR-486, miR-25, miR-24, miR-20a,miR-466 and miR-433-3p were significantly downregulated in I/R. In particular, miR-20a, a miRNA highly expressed in umbilical cord-derived mesenchymal stem cells, was proved to bind to the 3? UTR of Beclin-I and FAS to exert an inhibitory effect on their expressions. Since Beclin-I and FAS were aberrantly upregulated in IR, exosomes separated from UC-MSCs showed therapeutic efficacy in reversing I/R induced apoptosis. In addition, exosomes reinforced with miR-20a and separated from UC-MSCs almost fully alleviated I/R injury. Furthermore, our results showed that miR-20a could alleviate the abnormal expression of genes related to apoptosis and autophagy, such as active Caspase-3, mTOR, P62, and LC3II. This study presented detailed evidence to clarify the mechanism underlying the therapeutic efficacy of UC-MSCs in the treatment of I/R injury.
Keywords:apoptosis  autophagy  exosome  liver I/R injury  MSCs
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