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- W2291333863 abstract "For long it has been known that changes in vascular smooth muscle tone plays an important role in blood flow distribution and blood pressure control. pH changes features as one of the factors influencing vascular smooth muscle tone. The aim of the present study was to investigate the effects of mild and severe alkalosis on endothelium-dependent vasodilatatory responses and the role of nitric oxide (NO) on isolated rat thoracic aorta. We assessed the in vitro (¡̈organ chambers¡̈) effects of increasing pH in vascular function of thoracic aorta rings. pH-response curves (7.4 to 8.5) were generated using NaOH in phenylephrine pre-contracted rings. Experiments were conducted in the presence and absence of indomethacin, NG-nitro-L-arginina metil ester (L-NAME), N5-(1-iminoethyl)-L-ornithine hydrochloride (L-NIO), N-(6-Aminohexyl)-5-chloro-1-naphthalenesulfonamide (W-7), 2,5-dimethylbenzimidazole (DMB) and methyl-ƒÒ-cyclodextrin (CD). Our investigation demonstrated that alkalosis vasodilatory effect on rat thoracic aorta: 1) is endothelium-dependent and induced by NO; 2) is prostacyclin-independent; 3) is dependent of the constitutive endothelium NO synthase isoform and of the complex Ca+2/calmodulin; 4) has Na+/Ca+2 exchanger and caveolae as important components in relaxing mechanism. Support: FAPESP; FAEPA-HC/FMRP." @default.
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- W2291333863 date "2009-04-01" @default.
- W2291333863 modified "2023-09-27" @default.
- W2291333863 title "Metabolic alkalosis vasodilation: role of endothelium and nitric oxide" @default.
- W2291333863 doi "https://doi.org/10.1096/fasebj.23.1_supplement.952.11" @default.
- W2291333863 hasPublicationYear "2009" @default.
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