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- W2024979890 abstract "The signalling pathway involved in beta-adrenoceptor relaxation was studied in aortas from rats either 8 or 54 weeks of age. The vasorelaxation produced by isoprenaline was almost completely abolished by endothelium removal in 54-week aortas, whereas in 8-week aortas, the effect was much smaller. The nitric oxide synthase inhibitor N-methyl-1-arginine acetate (L-NMMA) partially attenuated the isoprenaline induced relaxation to a similar extent in both age groups when the endothelium was intact, suggesting that although nitric oxide was involved, it could not explain the age-related difference. The K(+) channel inhibitor, tetraethylammonium inhibited isoprenaline vasorelaxation to a larger degree in 54-week compared to 8-week aortas indicating that K(+) channels were responsible for the age-related differences. We suggest that as the animals age, the smooth muscle cyclic AMP signalling system declines, and that this is compensated for by an alternate pathway involving the opening of K(+) channels." @default.
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- W2024979890 title "Age-related involvement of the endothelium in β-adrenoceptor-mediated relaxation of rat aorta" @default.
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- W2024979890 doi "https://doi.org/10.1016/s0014-2999(00)00193-x" @default.
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