miR-126 promotes angiogenesis and attenuates inflammation after contusion spinal cord injury in rats

Brain Research
Jian-Zhong HuHong-Bin Lu

Abstract

MicroRNAs are a class of small RNAs that regulate the expression of target mRNAs by inhibiting translation or destabilizing target mRNAs. miR-126 is a microRNA that is highly enriched in endothelial cells. miR-126 has been found to promote angiogenesis and inhibit vascular inflammation in endothelial cells by repressing three target genes Sprouty-related EVH1 domain-containing protein 1 (SPRED1), phosphoinositol-3 kinase regulatory subunit 2 (PIK3R2), and vascular cell adhesion molecule 1 (VCAM1). Our previous study showed that the expression of miR-126 was downregulated after spinal cord injury (SCI). Therefore, we wanted to examine whether upregulation of miR-126 could promote angiogenesis, inhibit inflammation, and exert a positive effect on recovery after contusion SCI. In this study, we found that increased levels of miR-126 promoted angiogenesis, and inhibited leukocyte extravasation into the injured spinal cord, which was concurrent with downregulation of mRNA and protein expression of three validated miR-126 target genes, SPRED1, PIK3R2, and VCAM1. Moreover, a dose-dependent effect of miR-126 was observed in rescuing tissue damage and improving the functional deficit after SCI. Thus, the present study indicated that miR...Continue Reading

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