Vesicle miR-195 derived from endothelial cells inhibits expression of serotonin transporter in vessel smooth muscle cells

Junzhong Gu, Huiyuan Zhang, Bingyang Ji, Hui Jiang, Tao Zhao, Rongcai Jiang, Zhiren Zhang, Shengjiang Tan, Asif Ahmed, Yuchun Gu*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Serotonin or 5-hydroxytryptamine (5-HT) has been shown to be essential in lots of physiological and pathological processes. It is well known that 5-HT and 5-HT transporter (5-HTT) play important roles in the pulmonary artery in pulmonary hypertension. However, little is known about the function of 5-HTT in other arteries. In this study we found that the expression of 5-HTT was elevated in injured carotid arteries and over-expression of 5-HTT induced proliferation of smooth muscle cells (SMCs); however, this phenotype could be reversed by knocking-down of 5-HTT or endothelial cells conditional medium (EC-CM). A 5-HTT inhibitor, fluoxetine, treated animals also exhibited reduced restenosis after injury. We identified that miR-195 was packaged in the extracellular vesicles from EC-CM. We further confirmed that extracellular vesicles could transfer miR-195 from ECs to SMCs to inhibit the expression of 5-HTT in SMCs and the proliferation of SMCs. These results provide the first evidence that ECs communicate with SMCs via micro-RNA195 in the regulation of the proliferation of SMCs through 5-HTT, which will contribute to a better understanding of communications between ECs and SMCs via micro-RNA. Our findings suggest a potential target for the control of vessel restenosis.

Original languageEnglish
Article number43546
Number of pages10
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 8 Mar 2017

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Funding: 973 Project No. 2013CB531206, 973 Project No.
2012CB517803 and NSF No.81170236, No.31127001

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