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- W2037281505 abstract "The effects of nitric oxide synthase inhibitor Nω-nitro-L-arginine methyl ester (L-NAME) and chloride channel antagonist niflumic acid on vascular responsiveness to the effect of α1-adrenoceptor stimulation in the mesenteric bed of Dahl salt-resistant normotensive (SRN) and salt-sensitive hypertensive (SSH) rats were examined. Dahl salt-resistant and salt-sensitive rats were fed a high-salt diet (4% NaCl) for 7 weeks, and blood pressure, heart rate, and mesenteric blood flow were measured before and after treatment with L-NAME (0.3 mg/kg, IV) and/or niflumic acid (10 mg/kg, IV). Morphometry of the primary mesenteric blood vessel was also assessed. Administration of α1-adrenoceptor agonist cirazoline produced a dose-dependent increase in blood pressure, decrease in heart rate, mesenteric blood flow, and mesenteric vascular conductance in SRN and SSH rats. L-NAME significantly increased basal blood pressure and decreased basal mesenteric blood flow and vascular conductance in SRN but not in SSH rats. Niflumic acid attenuation of cirazoline-mediated decreases in mesenteric blood flow and vascular conductance was more pronounced in the SRN than SSH rats. This difference in the inhibitory actions of niflumic acid was absent following its concomitant administration with L-NAME. It seems that tonic release of nitric oxide modulates niflumic acid-sensitive chloride channels in vascular muscle. Blood vessels from SSH rats had significantly larger smooth muscle thickness and lumen diameter, but the ratio of the 2 were not different between the SRN and SSH. Our findings support the view that alterations in receptor-mediated signal transduction, rather than just changes in blood vessel architecture, are responsible for differences in behavior of blood vessels in salt-induced hypertensive rats." @default.
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- W2037281505 date "2005-06-01" @default.
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- W2037281505 title "Impact of Nitric Oxide Synthase Inhibitor and Chloride Channel Antagonist on Mesenteric Vascular Conductance in Anesthetized Dahl Normotensive and Hypertensive Rats" @default.
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- W2037281505 doi "https://doi.org/10.1097/01.fjc.0000159877.58701.56" @default.
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