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- W2332892010 abstract "It has been postulated that exaggerated renal sensitivity to angiotensin II may be involved in the development and maintenance of hypertension in the spontaneously hypertensive rat (SHR). The purpose of this study was to compare the renal vascular responses to short-term angiotensin II infusions (50 ng/kg/min, i.v.) in conscious SHRs and Wistar-Kyoto (WKY) rats. Renal cortical blood flow was measured in conscious rats by using quantitative renal perfusion imaging by magnetic resonance, and blood pressure was measured by an indwelling carotid catheter attached to a digital blood pressure analyzer. Renal vascular responses to angiotensin II were similar in control SHRs and WKY rats. Pretreatment with captopril to block endogenous production of angiotensin II significantly augmented the renal vascular response to exogenous angiotensin II in the SHRs but not in the WKY rats. The renal vascular responses to angiotensin II were significantly greater in captopril-pretreated SHRs than in WKY rats (cortical blood flow decreased by 1.66 ± 0.13 ml/min/g cortex in WKY rats compared with 2.15 ± 0.14 ml/min/g cortex in SHR; cortical vascular resistance increased by 10.5 ± 1.4 mm Hg/ml/min/g cortex in WKY rats compared with 15.6 ± 1.7 mm Hg/ml/min/g cortex in SHRs). Responses to angiotensin II were completely blocked in both strains by pretreatment with the angiotensin II AT1-receptor antagonist losartan. Results from this study in conscious rats confirm previous findings in anesthetized rats that (a) the short-term pressor and renal vascular responses to angiotensin II are mediated by the AT1 receptor in both SHRs and WKY rats, and (b) the renal vascular responses to angiotensin II are enhanced in SHRs compared with WKY rats when endogenous production of angiotensin II is inhibited by captopril pretreatment." @default.
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- W2332892010 date "1998-06-01" @default.
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- W2332892010 title "Renal Vascular Responses to Angiotensin II in Conscious Spontaneously Hypertensive and Normotensive Rats" @default.
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- W2332892010 doi "https://doi.org/10.1097/00005344-199806000-00008" @default.
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