Molecular and functional characterization of circulating extracellular vesicles from diabetic patients with and without retinopathy and healthy subjects

Experimental Eye Research
Aurora MazzeoMassimo Porta

Abstract

Diabetic retinopathy is a sight-threatening complication of diabetes, characterized by loss of retinal pericytes and abnormal angiogenesis. We previously demonstrated that extracellular vesicles (EVs) derived from mesenchymal stem cells cultured in diabetic-like conditions are able to enter the pericytes, causing their detachment and migration, and stimulating angiogenesis in vitro. The purpose of this work was the molecular and functional characterization of EVs derived from diabetic subjects with or without diabetic retinopathy, compared with healthy controls. Characterization of EVs extracted from serum/plasma of diabetic patients with or without retinopathy, and healthy controls, was performed by FACS and microarray analysis of microRNA (miRNA) content. Relevant miRNA expression was validated through qRT-PCR. EV influence on pericyte detachment, angiogenesis and permeability of the blood-retinal barrier was also investigated. Diabetic subjects had a 2.5 fold higher EV concentration than controls, while expression of surface molecules was unchanged. Microarray analysis revealed 11 differentially expressed miRNAs. Three of them (miR-150-5p, miR-21-3p and miR-30b-5p) were confirmed by qRT-PCR. Plasma EVs from subjects with dia...Continue Reading

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