Exosomes derived from human umbilical cord mesenchymal stem cells improve myocardial repair via upregulation of Smad7

It has been previously reported that exosomes derived from human umbilical cord mesenchymal stem cells (hucMSC)-exosomes exhibit cardioprotective effects on the rat acute myocardial infarction (AMI) models and cardiomyocyte hypoxia injury models in vitro, however the exact mechanisms involved requir...

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Bibliographic Details
Published in:International journal of molecular medicine 2018-05, Vol.41 (5), p.3063-3072
Main Authors: Wang, Xin-Long, Zhao, Yuan-Yuan, Sun, Li, Shi, Yu, Li, Zhu-Qian, Zhao, Xiang-Dong, Xu, Chang-Gen, Ji, Hong-Ge, Wang, Mei, Xu, Wen-Rong, Zhu, Wei
Format: Article
Language:English
Subjects:
Apoptosis
Cardiomyocytes
Cardiovascular disease
Care and treatment
Development and progression
Gene expression
Genes
Genetic aspects
Health aspects
Heart attack
Heart attacks
Heart failure
Hypoxia
Laboratory animals
Methods
MicroRNAs
Organelles
Patient outcomes
Proteins
Rodents
Stem cell transplantation
Stem cells
Studies
Transcription factors
Umbilical cord
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Summary:It has been previously reported that exosomes derived from human umbilical cord mesenchymal stem cells (hucMSC)-exosomes exhibit cardioprotective effects on the rat acute myocardial infarction (AMI) models and cardiomyocyte hypoxia injury models in vitro, however the exact mechanisms involved require further investigation. The present study aimed to investigate the repair effects of hucMSC-exosomes on myocardial injury via the regulation of mothers against decapentaplegic homolog 7 (Smad7) expression. Compared with sham or normoxia groups (in vivo and in vitro, respectively), western blotting demonstrated that Smad7 expression was significantly decreased in the borderline area of infraction myocardium and in H9C2(2-1) cells following hypoxia-induced injury. Additionally, microRNA (miR)-125b-5p expression was markedly increased using reverse transcription-quantitative polymerase chain reaction, but was reversed by hucMSC-exosomes. Trypan blue staining and lactate dehydrogenase release detection demonstrated that cell injury was significantly increased in the AMI + PBS and hypoxia group compared with in the sham and normoxia groups and was inhibited by hucMSC-exosomes. A dual luciferase reporter gene assay confirmed that Smad7 is a target gene of miR-125b-5p. In addition, miR-125b-5p mimics promoted H9C2(2-1) cell injury following 48 h exposure to hypoxia. Downregulation of Smad7 expression under hypoxia was increased by miR-125b-5p mimics compared with the mimic negative control, and hucMSC-exosomes partially alleviated this phenomenon. In conclusion, hucMSC-exosomes may promote Smad7 expression by inhibiting miR-125b-5p to increase myocardial repair. The present study may provide a potential therapeutic approach to improve myocardial repair following AMI.
ISSN:1107-3756
1791-244X
DOI:10.3892/ijmm.2018.3496