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- W2024357735 abstract "In the present study, intraperitoneal injection of lipopolysaccharide (10 mg/kg) to anaesthetized rats produced a gradual fall in mean arterial pressure in 6 h. Aortic rings from lipopolysaccharide-treated rats showed a significant reduction in the contractile response to vasoconstrictors. Pretreatment with N(G)-nitro-L-arginine methyl ester (L-NAME) or aminoguanidine, two nitric oxide synthase (NOS) inhibitors, abolished this vascular hyporeactivity. In ventricular myocytes isolated from lipopolysaccharide-treated rats, both electrically induced Ca(2+) transients and the intracellular Ca(2+) response to beta-adrenergic stimulation were significantly depressed when compared with those recorded from myocytes from sham control rats. L-NAME and aminoguanidine alone had no effects on electrically stimulated Ca(2+) transients in ventricular myocytes either from control or lipopolysaccharide-treated rats. However, these two NOS inhibitors augmented the intracellular Ca(2+) response to beta-adrenergic stimulation in myocytes from lipopolysaccharide-treated rats, but not in control myocytes. In addition, 1H-[1,2,4]oxadiazolo[4, 3-a]quinoxalin-1-one (ODQ), an inhibitor of nitric oxide (NO)-sensitive guanylyl cyclase, also reversed the intracellular Ca(2+) hyporesponsiveness to beta-adrenergic stimulation in myocytes from lipopolysaccharide-treated rats. In cardiac myocytes from lipopolysaccharide-rats pretreated with aminoguanidine, the intracellular Ca(2+) hyporesponsiveness to beta-adrenergic stimulation was abolished. However, there still existed a depressed Ca(2+) response to electrical field stimulation. These data indicate that NO following lipopolysaccharide stimulation contributes to vascular hyporeactivity and the depressed intracellular Ca(2+) response to beta-adrenergic stimulation in lipopolysaccharide-treated rats, but is not responsible for the reduced Ca(2+) response to electrical stimulation in our experimental conditions." @default.
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- W2024357735 title "Cardiac and vascular effects of nitric oxide synthase inhibition in lipopolysaccharide-treated rats" @default.
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- W2024357735 doi "https://doi.org/10.1016/s0014-2999(00)00660-9" @default.
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