Adipocytokine levels mark endothelial function in normotensive individuals

Area of Science:

• Cardiovascular Research
• Endocrinology
• Vascular Biology

Background:

• Endothelial dysfunction is a key risk factor for cardiovascular events.
• Adipose tissue-derived inflammatory mediators can induce insulin resistance and endothelial dysfunction.
• This study investigates the association between adipocytokines, endothelial function, and blood pressure.

Purpose of the Study:

• To examine the relationship between adipocytokines (RBP4, resistin) and endothelial function in essential hypertensive (HT) patients and normotensive (NT) subjects.
• To explore the role of oxidative stress (MDA) in this relationship.
• To determine if adipocytokines are independent predictors of endothelial dysfunction.

Main Methods:

• Assessed endothelium-dependent vasodilation (flow-mediated dilation) and -independent vasodilation (glyceryl-trinitrate response) in 92 HT and 66 NT individuals.
• Measured serum levels of Retinol Binding Protein-4 (RBP4) and resistin using ELISA and RIA.
• Evaluated oxidative stress via serum malondialdehyde (MDA) levels.

Main Results:

• Flow-mediated dilation was significantly lower in HT patients compared to NT subjects (p=0.03).
• RBP4, resistin, and MDA levels did not differ significantly between HT and NT groups.
• In NT subjects, RBP4 and resistin levels correlated with flow-mediated dilation, but not in HT patients. Multivariate analysis in NT subjects indicated BMI, waist circumference, and resistin were associated with flow-mediated dilation.

Conclusions:

• Adipocytokine levels may serve as independent predictors of endothelial dysfunction in peripheral circulation of healthy individuals.
• These findings suggest a pathophysiological link between adipose tissue inflammation and early vascular alterations.
• Adipocytokines could play a role in the early stages of vascular disease development.