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• W2330860156 abstract "Objective To assess the site of action of endothelin-1 in vessels of different sizes in the kidney in vivo and investigate the function of endothelin A (ETA) receptors in mediating renal and systemic vasoconstriction. Design The luminal diameters of different vessels were measured and glomerular blood flow in cortical glomeruli was determined by intravital videomicroscopy in the split hydronephrotic kidney of anesthetized female Wistar rats. Methods The rats were infused with endothelin-1 (40 pmol/kg per min) with or without pretreatment with the selective ETA-receptor antagonist BQ-123 (0.5 mg/kg). Aortic clamping was used to control renal blood pressure during the endothelin-1 infusion. Results Exogenous endothelin-1 induced a significant rise (30 ± 3%) in mean arterial pressure and a marked, long-lasting fall in glomerular blood flow (53 ± 3%) related to reduction of the inner diameter of arcuate (−30%), interlobular arteries (−33%) and afferent arterioles (−17%). Aortic clamping to normalize renal blood pressure did not attenuate the vasoconstriction and reduction in glomerular blood flow. Pretreatment with BQ-123 significantly reduced both the endothelin-1-induced rise in mean arterial pressure (12 ± 1%) and the fall in glomerular blood flow (−23 ± 11%). BQ-123 blunted the response to endothelin-1 in arcuate (−12%), interlobular (−11%) and afferent vessels (−5%). Acetylcholine and nitroprusside completely reversed the vasoconstriction in BQ-123-pretreated animals. Conclusions BQ-123 largely prevented the hemodynamic effects of exogenously administered endothelin-1. Our direct in-vivo techniques showed that ETA receptors are, at least in part, involved in endothelin-1-mediated vasoconstriction in the rat kidney, and support the hypothesis that ETA receptors may help to control arterial pressure in anesthetized rats." @default.
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• W2330860156 date "1998-10-01" @default.
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• W2330860156 title "Effects of BQ-123 on systemic and renal hemodynamic responses to endothelin-1 in the rat split hydronephrotic kidney" @default.
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• W2330860156 doi "https://doi.org/10.1097/00004872-199816100-00008" @default.
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