Irisin improves endothelial function in type 2 diabetes through reducing oxidative/nitrative stresses

Area of Science:

• Endocrinology
• Cardiovascular Biology
• Metabolic Diseases

Background:

• Vascular complications are a leading cause of mortality in diabetes.
• Endothelial dysfunction is an early indicator of diabetic vascular complications.
• Reduced plasma irisin levels are observed in type 2 diabetes patients.

Purpose of the Study:

• To investigate the potential of irisin in improving endothelial function in type 2 diabetes.
• To elucidate the underlying mechanisms by which irisin exerts its protective effects on vasculature.

Main Methods:

• A type 2 diabetes mouse model was established using a high-fat diet.
• In vivo irisin treatment and ex vivo aortic segment incubation were performed.
• Human umbilical vein endothelial cells (HUVECs) were used to study cellular mechanisms.

Main Results:

• Irisin treatment improved endothelium-dependent vasorelaxation and p-VASP levels in diabetic mice.
• Ex vivo irisin exposure enhanced vasorelaxation and reduced oxidative/nitrative stress in diabetic aortas.
• Irisin mitigated high-glucose/high-fat-induced oxidative stress and apoptosis in HUVECs by inhibiting PKC-β/NADPH oxidase and NF-κB/iNOS pathways.

Conclusions:

• Irisin alleviates endothelial dysfunction in type 2 diabetes.
• Irisin's protective effects are mediated by reducing oxidative/nitrative stress via specific signaling pathways.
• Irisin shows promise as a therapeutic agent for diabetic vascular complications.