| Experimental hypertension produces diverse changes in the regional vascular responses to endothelin-1 in the rabbit and the rat. | |
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MedLine Citation:
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PMID: 7868869 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To examine the effects of hypertension on systemic and regional haemodynamic responses to endothelin-1. DESIGN: Comparison of responses between age-matched control and hypertensive rabbits (two-kidney, two wrapped), and between spontaneously hypertensive rats (SHR) and control Wistar-Kyoto rats. METHODS: Arterial pressure, heart rate and blood flow responses to 0.2 nmol/kg intravenous endothelin-1 were measured in conscious animals. Blood flow was measured by pulsed ultrasound Doppler in the ascending aorta, distal abdominal aorta, left renal artery and superior mesenteric artery. RESULTS: Endothelin-1 produced qualitatively similar effects in the hypertensive and control animals. In the systemic circulation, brief initial vasodilation preceded sustained vasoconstriction. In the hindlimb, marked vasodilation preceded relatively minor vasoconstriction, and profound vasoconstriction occurred in the renal and mesenteric vascular beds. In the rats but not the rabbits, fleeting vasodilation preceded the renal and mesenteric vasoconstriction. Significant differences between hypertensive and control animals were: accentuation of the pressor effect and heart rate responses in hypertensive animals of both species, and accentuation of hindlimb vasodilation in hypertensive rabbits but not SHR; and attenuation of the depressor effect in SHR but not hypertensive rabbits, attenuation of the mesenteric vasoconstriction in both hypertensive rabbits and rats, and attenuation of renal vasoconstriction in SHR. CONCLUSIONS: The increased responses to endothelin-1 of some variables in the hypertensive animals may involve structural changes in the resistance vessels. However, the reduced responses in the mesenteric vasculature of both species and the renal vasculature of the SHR are due to some mechanism other than structural change. |
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Authors:
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P Roberts-Thomson; R J McRitchie; J P Chalmers |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of hypertension Volume: 12 ISSN: 0263-6352 ISO Abbreviation: J. Hypertens. Publication Date: 1994 Nov |
Date Detail:
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Created Date: 1995-03-29 Completed Date: 1995-03-29 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8306882 Medline TA: J Hypertens Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 1225-34 Citation Subset: IM |
Affiliation:
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Department of Medicine, Flinders Medical Centre, Bedford Park, South Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Flow Velocity / drug effects Endothelins / blood, pharmacology* Hemodynamics / drug effects* Hindlimb / blood supply Hypertension / physiopathology*, ultrasonography Kidney / blood supply, ultrasonography Male Mesenteric Arteries / drug effects, ultrasonography Rabbits Rats Rats, Inbred SHR Rats, Inbred WKY Ultrasonography, Doppler, Pulsed Vascular Resistance / drug effects Vasoconstriction / drug effects* Vasodilation / drug effects* |
| Chemical | |
Reg. No./Substance:
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0/Endothelins |
| Comments/Corrections | |
Erratum In:
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J Hypertens 1994 Dec;12(12):following H44 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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