Capsaicin Alleviates Vascular Endothelial Dysfunction and Cardiomyopathy via TRPV1/eNOS Pathway in Diabetic Rats

Area of Science:

• Cardiovascular Science
• Endocrinology
• Pharmacology

Background:

• Diabetes mellitus is linked to significant vascular complications, including endothelial dysfunction and cardiomyopathy.
• Capsaicin (CAP), a TRPV1 agonist, was investigated for its potential protective effects against these diabetes-induced conditions.

Purpose of the Study:

• To determine if capsaicin (CAP) can prevent endothelial dysfunction and cardiomyopathy in a rat model of diabetes.
• To elucidate the role of the TRPV1/eNOS pathway in capsaicin's potential protective mechanisms.

Main Methods:

• A diabetes model was established in rats using streptozotocin (STZ).
• Diabetic rats were treated with CAP for 8 weeks, with separate groups for untreated diabetes and healthy controls.
• In vitro studies used cultured mouse vascular endothelial cells exposed to high glucose, with and without CAP, capsazepine (CPZ), or L-NAME.

Main Results:

• CAP treatment reduced serum total cholesterol and triglycerides, and improved cardiac pathogenesis and fibrosis.
• CAP enhanced TRPV1 and eNOS expression, normalized vascular permeability, increased nitric oxide, and reduced reactive oxygen species in diabetic rats and cells.
• The beneficial effects of CAP were blocked by TRPV1 inhibitor (CPZ) or eNOS inhibitor (L-NAME), indicating pathway dependency.

Conclusions:

• Capsaicin demonstrates protective effects against hyperglycemia-induced endothelial dysfunction and diabetic cardiomyopathy.
• These benefits are mediated through the TRPV1/eNOS signaling pathway.