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- W2187496526 abstract "In isolated porcine pulmonary arterioles with endothelium, intraluminal diameter measured at a transmural pressure of 20 mmHg decreased spontaneously from 233 +/- 11 to 171 +/- 12 micrometer in 135 min. This intrinsic constriction was not prevented by indomethacin, tetraethylammonium, or superoxide dismutase. Indomethacin plus NG-nitro-L-arginine methyl ester caused initial constriction and BQ-123 or BQ-123 plus BQ-788 caused initial dilation, but these treatments did not prevent subsequent progressive constriction. In pulmonary arterioles with endothelium exposed to calcium-free conditions and pulmonary arterioles without endothelium, the intraluminal diameter measured at a transmural pressure of 20 mmHg was constant at 239 +/- 16 and 174 +/- 7 micrometer, respectively. Thus the spontaneous development of tone in isolated pulmonary arterioles required extracellular calcium and resulted from 1) time-independent smooth muscle contraction caused by mechanisms intrinsic to smooth muscle and 2) time-dependent contraction caused by decreasing activity of endothelium-derived relaxing factors other than nitric oxide, vasodilator prostaglandins, and hyperpolarizing factors acting on calcium-dependent potassium channels or increasing activity of endothelium-derived contracting factors other than endothelin-1, vasoconstrictor prostaglandins, and superoxide anions. Further investigation is indicated to identify these unknown mechanisms and determine their role in pulmonary vasoreactivity." @default.
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- W2187496526 date "1999-05-01" @default.
- W2187496526 modified "2023-09-27" @default.
- W2187496526 title "Development of intrinsic tone in isolated pulmonary arterioles" @default.
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- W2187496526 doi "https://doi.org/10.1152/ajplung.1999.276.5.l805" @default.
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