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Title: Vascular endothelin responsiveness and receptor characteristics in vitro and effects of endothelin receptor blockade in vivo in cyclosporin hypertension.
Austin Authors: Phillips, P A;Rolls, K A;Burrell, Louise M ;Casley, David J;Aldred, K L;Hardy, Kenneth John
Affiliation: Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Victoria, Australia
Issue Date: 1-Mar-1994
Publication information: Clinical and Experimental Pharmacology & Physiology; 21(3): 223-6
Abstract: 1. The aim of these studies was to determine the role of endothelin in cyclosporin A ([CsA], 10 mg/kg per day, s.c., for 30 days) hypertension in the rat. 2. There were no significant differences in plasma endothelin concentrations, in vitro mesenteric vascular membrane [125I]-endothelin-1 (ET-1) binding characteristics or myographic vascular responses to endothelin-1 between the CsA and control groups (systolic blood pressure 135 +/- 1 vs 127 +/- 1 mmHg, respectively, P < 0.001). 3. Twenty-four hours after selective endothelin type A receptor blockade in vivo with BQ123, blood pressure in CsA hypertensive rats was lowered to levels of normotensive controls. 4. These results suggest that changes in endothelin synthesis rather than changes in vascular sensitivity and/or ET-1 receptor characteristics may contribute to CsA-induced hypertension.
Gov't Doc #: 8076426
Type: Journal Article
Subjects: Animals
Blood Pressure.drug effects.physiology
Endothelin Receptor Antagonists
Hypertension.chemically induced.physiopathology
In Vitro Techniques
Iodine Radioisotopes
Muscle, Smooth, Vascular.drug effects.physiology.ultrastructure
Rats, Wistar
Receptors, Endothelin.physiology
Vascular Resistance.drug effects.physiology
Vasoconstriction.drug effects.physiology
Appears in Collections:Journal articles

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