Work

Troglitazone‐Induced Changes in Adiponectin Do Not Affect Endothelial Function in Diabetes

Year: 2005

Type: article

Study designs: Randomized Controlled Trial, Clinical Trial

Abstract: OBJECTIVE: Adiponectin has been proposed to be related to endothelial function. We have examined the relationship between the increase in adiponectin levels that is associated with troglitazone treatment and endothelium-dependent vasodilation in type 2 diabetic patients. RESEARCH METHODS AND PROCEDURES: Seventy-two patients participated in this randomized, placebo-controlled, double-blinded study. High-resolution ultrasound images were used to measure the flow-mediated dilation (endothelium-dependent) and nitroglycerin-induced dilation (endothelium-independent) of the brachial artery. Laser Doppler perfusion imaging was employed to measure the vascular reactivity in the forearm skin. RESULTS: Troglitazone treatment resulted in an average 75% increase in the adiponectin levels, but no changes were observed in the endothelium-dependent vasodilation, any other measurement of vascular reactivity, or any other markers of endothelial activation. Also, no changes were observed in the expression of the receptor for advanced glycation end-products in skin biopsies taken from the forearm. Significant correlations were observed during troglitazone treatment between the changes in the adiponectin levels and the changes in fasting plasma glucose (r = -0.29, p < 0.05), hemoglobin A(1c) (r = -0.30, p < 0.05), total cholesterol (r = 0.25, p < 0.05), and low-density lipoprotein-cholesterol (r = 0.34, p < 0.01). DISCUSSION: The increase in adiponectin levels after troglitazone treatment is not associated with an improvement in the endothelium-dependent vasodilation, indicating that adiponectin is not a major determinant of endothelial function. In addition, receptor for advanced glycation end-products expression in the skin microcirculation is not affected by troglitazone treatment.

Source: Obesity Research

DOI: 10.1038/oby.2005.138

Authors: Jon Buras, Wende R. Reenstra, Daniel Orlow, Edward S. Horton, Aristidis Veves

Institutions: Beth Israel Deaconess Medical Center, Joslin Diabetes Center, Harvard University

Language: English

Topic: Adipokines, Inflammation, and Metabolic Diseases

Subfield: Epidemiology

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: bronze

Funders: American Diabetes Association, National Institutes of Health, National Center for Research Resources