MicroRNA-29 regulates myocardial microvascular endothelial cells proliferation and migration in association with IGF1 in type 2 diabetes.

Abstract:

BACKGROUND:In our study, we investigated the expression and function of microRNA-29 in myocardial microvascular endothelial cells (MMEVC) in type 2 diabetic Goto-Kakizaki (GK) rats. METHODS:MiR-29 gene expression was compared, by qRT-PCR between diabetic GK rat MMEVC and non-diabetic Wistar rat MMEVC. MiR-29 was downregulated in GK MMEVC and its effect on angiogenic properties of proliferation and migration was examined. Potential downstream target gene of miR-29, insulin growth factor 1 (IGF1), was assessed by dual-luciferase reporter assay, qRT-PCR and western blot in GK MMEVC. IGF1 was also downregulated by siRNA in miR-29-downregulated GK MMEVC. Its effect on miR-29-associated angiogenic regulation on MMEVC proliferation and migration was further investigated. RESULTS:MiR-29 was substantially upregulated in GK MMEVC than in Wistar MMEVC. Transfection of synthetic miR-29 inhibitor successfully downregulate endogenous miR-29 in GK MMEVC, and subsequently promoted angiogenesis by increasing cell proliferation and migration. IGF1 was confirmed to be downstream target gene of miR-29 in GK MMEVC, with its gene and protein expressions both upregulated in miR-29-downregualted GK MMEVC. Conversely, siRNA-mediated IGF1 downregulation reversed the pro-angiogenic effect of miR-29 downregulation in GK MMEVC, as it decreased cell proliferation and migration. CONCLUSION:Our study suggests that miR-29 downregulation, through its inverse regulation on downstream target of IGF1 gene, is a pro-angiogenic factor in MMEVC in type 2 diabetic rats.

authors

Li Z,Jiang R,Yue Q,Peng H

doi

10.1016/j.bbrc.2017.03.055

subject

Has Abstract

pub_date

2017-05-20 00:00:00

pages

15-21

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)30514-4

journal_volume

487

pub_type

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