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• W2094753822 startingPage "R331" @default.
• W2094753822 abstract "In the chicken embryo, acute hypoxemia results in cardiovascular responses, including an increased peripheral resistance. We investigated whether local direct effects of decreased oxygen tension might participate in the arterial response to hypoxemia in the chicken embryo. Femoral arteries of chicken embryos were isolated at 0.9 of incubation time, and the effects of acute hypoxia on contraction and relaxation were determined in vitro. While hypoxia reduced contraction induced by high K + to a small extent (−21.8 ± 5.7%), contractile responses to exogenous norepinephrine (NE) were markedly reduced (−51.1 ± 3.2%) in 80% of the arterial segments. This effect of hypoxia was not altered by removal of the endothelium, inhibition of NO synthase or cyclooxygenase, or by depolarization plus Ca 2+ channel blockade. When arteries were simultaneously exposed to NE and ACh, hypoxia resulted in contraction (+49.8 ± 9.3%). Also, relaxing responses to ACh were abolished during acute hypoxia, while the vessels became more sensitive to the relaxing effect of the NO donor sodium nitroprusside (pD 2 : 5.81 ± 0.21 vs. 5.31 ± 0.27). Thus, in chicken embryo femoral arteries, acute hypoxia blunts agonist-induced contraction of the smooth muscle and inhibits stimulated endothelium-derived relaxation factor release. The consequences of this for in vivo fetal hemodynamics during acute hypoxemia depend on the balance between vasomotor influences of circulating catecholamines and those of the endothelium." @default.
• W2094753822 created "2016-06-24" @default.
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• W2094753822 date "2002-08-01" @default.
• W2094753822 modified "2023-09-27" @default.
• W2094753822 title "Direct effects of acute hypoxia on the reactivity of peripheral arteries of the chicken embryo" @default.
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• W2094753822 doi "https://doi.org/10.1152/ajpregu.00675.2001" @default.
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