Abstract Title:

Aortic smooth muscle cell proliferation and endothelial nitric oxide synthase activity in fructose-fed rats.

Abstract Source:

Am J Hypertens. 2001 Nov;14(11 Pt 1):1135-41. PMID: 11724213

Abstract Author(s):

R Miatello, N Risler, C Castro, S González, M Rüttler, M Cruzado

Article Affiliation:

Department of Pathology, School of Medicine, National University of Cuyo, Mendoza, Argentina. rmiatell@fmed2.uncu.edu.ar

Abstract:

The aim of this study was to evaluate the proliferative behavior of vascular smooth muscle cells in primary culture (pC-SMC) and the endothelial nitric oxide synthase (eNOS) activity in the endothelial lining of the aorta of fructose-fed rats (FFR). This is an experimental model of syndrome X, a cluster of cardiovascular risk factors including hyperinsulinemia, insulin resistance, and hypertension that has been suggested to be of pathophysiologic importance for the development of atherosclerosis. Male Wistar rats were used: Control (n = 12) and FFR (n = 12). After receiving fructose in drinking water (10% w/v) during 8 weeks, biochemical parameters, systolic blood pressure (SBP) and relative heart weight (RHW) were determined. The proliferative effect of 10% fetal calf serum (FCS) was examined in aortic pC-SMC by [3H]thymidine incorporation and by cell counting. Ca2+/calmodulin-dependent NOS activity was estimated in aortic endothelial lining and in heart tissue homogenates by conversion of [3H]arginine into [3H]citrulline. Fructose-fed rats showed hyperinsulinemia (P = .0263), altered glucose tolerance test (P<.001), higher SBP (P<.0001), and RHW (P = .0145), compared to control rats. These animals also showed an increase of 10% FCS-induced [3H]thymidine incorporation (P<.0001) and cell number of aortic pC-SMC (P = .0049) and decreased eNOS activity in both aortic endothelium (P = .0147) and cardiac tissue (P<.0001). These data support the hypothesis that syndrome X is associated to changes in SMC proliferation and endothelial dysfunction, which could be involved in the onset or progression of the atherogenic process.

Study Type : Animal Study
Additional Links
Problem Substances : Fructose : CK(361) : AC(106)

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