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- W1965837360 abstract "The purpose of this study was to investigate the vascular contractile and inositol phosphate responses in portal hypertensive rats. Portal hypertension was induced by partial portal vein ligation (PVL) in Sprague–Dawley rats. Sham-operated rats served as controls. Pressures, vasoconstrictor responses, and inositol phosphate responses were determined at 14 days after surgery. The portal venous pressure was significantly higher, while systemic arterial pressure and heart rate were lower, in PVL rats. Dose-dependent contractile responses were observed for both norepinephrine (1 × 10 −8 – 3 × 10 −6 M) and vasopressin (3 × 10 −10 – 3 × 10 −8 M) in the tail artery of both groups. The contractile response to norepinephrine was significantly decreased in PVL rats compared with controls at all doses. The contractile response to vasopressin was significantly decreased in PVL rats at higher doses. After myo-[ 3 H]inositol incorporation in tail artery, the levels of 3 H-labelled phosphatidylinositols (cpm/mg) were similar between the two groups. Norepinephrine (10 −7 – 10 −5 M) and vasopressin (10 −10 – 10 −8 M) dose dependently stimulated the 3 H-labelled inositol phosphate production in the tail artery of both PVL and sham-operated rats. However, the response was significantly lower in PVL rats. The results suggested that the attenuation of vascular contractile responses in portal hypertension was reflected in the phosphoinositide messenger system.Key words: portal hypertension, inositol phosphates, phosphoinositide, tail artery, contractile response." @default.
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- W1965837360 date "1995-03-01" @default.
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- W1965837360 title "Decreased vascular contractile and inositol phosphate responses in portal hypertensive rats" @default.
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- W1965837360 doi "https://doi.org/10.1139/y95-048" @default.
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