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- W2117312568 abstract "Background —Platelet-activating effects have been reported with high-dose heparin in acute thrombotic disorders. Recent studies have shown that increased platelet aggregation is due to reduced nitric oxide (NO) production in endothelial cells cultured in the presence of high-dose heparin. The aim of this study was to determine whether heparin can affect the NO pathway and the regulation of the vascular tone in vivo. Methods and Results —Anesthetized and mechanically ventilated Sprague-Dawley rats were treated with high-dose heparin. After 4 hours, the endothelial constitutive NO synthase (ecNOS) protein content in the aorta decreased (36% reduction, P <0.05), as detected by immunoblotting, and NO-dependent vascular reactivity was impaired. In fact, the increase in mean arterial blood pressure after inhibition of ecNOS with N G -nitro- l -arginine methyl ester (30 mg/kg) was smaller in heparin-treated animals than in controls (+26.9±4.8 versus +48.3±9.1 mm Hg, P <0.05), and further infusion of the biological ecNOS substrate l -arginine (0.5 g/kg) was ineffective in reversing systemic vasoconstriction (−1% versus 28% vasodilatation, P <0.001). Conclusions —High-dose heparin can significantly affect vascular reactivity in vivo by downregulation of ecNOS protein expression." @default.
- W2117312568 created "2016-06-24" @default.
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- W2117312568 date "1999-06-08" @default.
- W2117312568 modified "2023-09-27" @default.
- W2117312568 title "High-Dose Heparin Impairs Nitric Oxide Pathway and Vasomotion in Rats" @default.
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- W2117312568 doi "https://doi.org/10.1161/01.cir.99.22.2861" @default.
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