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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Investigation of basal endothelial function in the obese Zucker rat in vitro.
General Pharmacology 2000 December
(a) We studied basal endothelial function in the insulin-resistant, obese Zucker rat, including the influence of superoxide anion on the regulation of contractile reactivity by nitric oxide (NO), following treatment in vivo with the antioxidant tiron or the pro-oxidant combination hydroquinone+buthionine sulfoximine. (b) The leftward shift in the contractile potency of phenylephrine due to NO synthase inhibition with N(G)-nitro-L-arginine methyl ester (L-NAME) was greater in the isolated aorta of the obese Zucker rat relative to its insulin-sensitive littermate, the lean Zucker rat. (c) Pretreatment with tiron depressed vasoconstriction to phenylephrine and comparably enhanced the L-NAME-mediated leftward shift in contractile reactivity in the obese and lean Zucker rats in hydroquinone+buthionine sulfoximine-sensitive manner. (d) Our data therefore indicate superior endothelial function in the obese relative to the lean Zucker rat, reflected by a greater regulation of vasoconstrictor reactivity by basal NO, while the regulation of NO bioavailability by superoxide anion is similar.
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