title: The antioxidant, U74389, ameliorates the depression of vascular reactivity caused by lipopolysaccharide.
abstract: There is growing evidence that an oxidant stress contributes to the deleterious effects of bacterial lipopolysaccharide (LPS). The present study evaluated the ability of the antioxidant, U74389, to prevent the depression of vascular reactivity caused by LPS. Aortic rings taken from rats given LPS showed a depression of maximum force in response to phenylephrine that was reversed by an inhibitor of nitric oxide synthase. Pretreatment of animals with U74389 attenuated this depression of vascular reactivity. U74389 did not limit the increase in serum tumor necrosis factor levels caused by LPS. These results show that U74389 can ameliorate the depression of vascular reactivity caused by LPS possibly by interfering with the induction of nitric oxide synthase.
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D001013:Aorta, Thoracic / Q000187:drug effects / Q000502:physiology; D066298:In Vitro Techniques; D008070:Lipopolysaccharides / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000187:drug effects*; D010656:Phenylephrine / Q000494:pharmacology; D011281:Pregnatrienes / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012680:Sensitivity and Specificity; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D014661:Vasoconstriction / Q000187:drug effects
chemical_list: D000975:Antioxidants; D008070:Lipopolysaccharides; D011281:Pregnatrienes; D014409:Tumor Necrosis Factor-alpha; C074965:U 74389F; D010656:Phenylephrine