Plasma exosome-derived miRNA-887-5p alleviates high glucose- and lipid-induced endothelial cell dysfunction

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Type 2 Diabetes Mellitus (T2DM) often complicates with Atherosclerosis (AS), leading to vascular endothelial dysfunction.
• Plasma-derived exosomal microRNAs (miRNAs) are implicated in disease pathogenesis.

Purpose of the Study:

• To identify differentially expressed miRNAs in plasma exosomes of T2DM patients with AS.
• To investigate the role of these miRNAs in high-glucose/high-lipid-induced vascular endothelial dysfunction.

Main Methods:

• Isolation and sequencing of plasma exosomal miRNAs from T2DM with AS patients and healthy controls.
• Bioinformatic analyses (GO, KEGG) of differentially expressed miRNAs.
• In vitro study using human umbilical vein endothelial cells (HUVECs) exposed to hyperglycemia and hyperlipidemia, followed by miR-887-5p modulation.

Main Results:

• Globally reduced exosomal miRNA expression in T2DM with AS patients.
• Identification of 21 upregulated and 23 downregulated miRNAs, with hsa-miR-887-5p showing the greatest fold change.
• miR-887-5p demonstrated protective effects on HUVECs, enhancing proliferation, migration, and nitric oxide (NO) production while reducing apoptosis and oxidative stress.

Conclusions:

• Plasma exosomal miRNA profiles are altered in T2DM complicated by AS.
• Specific miRNAs (hsa-miR-887-5p, hsa-miR-96-5p, hsa-miR-183-5p, hsa-miR-410-3p) are potential diagnostic and therapeutic candidates.
• miR-887-5p shows promise in mitigating diabetic vascular endothelial injury.