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microRNAs (miRNAs) have been reported to be involved in the progression of various diseases. This study evaluated the expression and clinical value of miR-374a in diabetic retinopathy (DR) patients and analysed the effects of miR-374a on the progression of DR. Subjects were divided into four groups: healthy control, type 2 diabetes mellitus without DR (NDR), proliferation DR (PDR) and non-proliferation DR (NPDR). Real-time polymerase chain reaction (qRT-PCR) was detected in the serum miR-374a levels of the subjects. The receiver operating characteristic (ROC) curve was used to evaluate the diagnostic value of miR-374a in DR patients. Pearson correlation was used to analyse the correlation between miRNA and clinical indicators of patients. High glucose (HG) in treatment of human retinal microvascular endothelial cells (HRMECs). The effects of miR-374a on cell proliferation and migration induced by HG were detected. Serum miR-374a was progressively accelerated in patients with NDR, NPDR and PDR than in healthy controls. Moreover, miR-374a can significantly distinguish between NDR and DR patients. Among DR patients, miR-374a can differentiate PDR patients from NPDR patients. Serum miR-374a was positively correlated with diabetes duration, fasting plasma glucose (FPG), glycosylated haemoglobin (HbA1c), and homoeostasis model assessment of insulin resistance (HOMA-IR) in DR patients. HG-induced proliferation and migration of HRMECs was inhibited by reduction of miR-374a. Dysregulation of miR-374a is involved in the progression of DR and serves a regulatory role in retinal, which can be used as a promising diagnostic biomarker for DR.

clinical and experimental optometry

Dysregulation of miR-374a is involved in the progression of diabetic retinopathy and regulates the proliferation and migration of retinal microvascular endothelial cells