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• W2134184057 startingPage "825" @default.
• W2134184057 abstract "Both cGMP-dependent and -independent mechanisms have been implicated in the regulation of vascular tone by NO. We analyzed acetylcholine (ACh)- and NO-induced relaxation in pressurized small arteries and aortic rings from wild-type (wt) and cGMP kinase I-deficient (cGKI(-/-)) mice. Low concentrations of NO and ACh decreased the spontaneous myogenic tone in wt but not in cGKI(-/-) arteries. However, contractions of cGKI(-/-) arteries and aortic rings were reduced by high concentrations (10 micromol/L) of 2-(N:, N-diethylamino)-diazenolate-2-oxide (DEA-NO). Iberiotoxin, a specific blocker of Ca(2+)-activated K(+) (BK(Ca)) channels, only partially prevented the relaxation induced by DEA-NO or ACh in pressurized vessels and aortic rings. DEA-NO increased the activity of BK(Ca) channels only in vascular smooth muscle cells isolated from wt cGKI(+/+) mice. These results suggest that low physiological concentrations of NO decrease vascular tone through activation of cGKI, whereas high concentrations of DEA-NO relax vascular smooth muscle independent of cGKI and BK(Ca). NO-stimulated, cGKI-independent relaxation was antagonized by the inhibition of soluble guanylyl cyclase or cAMP kinase (cAK). DEA-NO increased cGMP to levels that are sufficient to activate cAK. cAMP-dependent relaxation was unperturbed in cGKI(-/-) vessels. In conclusion, low concentrations of NO relax vessels by activation of cGKI, whereas in the absence of cGKI, NO can relax small and large vessels by cGMP-dependent activation of cAK." @default.
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• W2134184057 date "2000-10-27" @default.
• W2134184057 modified "2023-10-13" @default.
• W2134184057 title "Mechanisms of NO/cGMP-Dependent Vasorelaxation" @default.
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• W2134184057 doi "https://doi.org/10.1161/01.res.87.9.825" @default.
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