PMID: 9170005May 1, 1997Paper

Effects of chronic losartan treatment on vascular reactivity in normotensive rats

Journal of Hypertension
F J DowellD Henrion

Abstract

To investigate the vasoactive properties of large (aorta) and small (mesenteric) arteries in vitro after chronic losartan treatment of normotensive rats, hence providing information on the role played by angiotensin II in vascular tone. Wistar rats were treated with 10 mg/kg per day losartan for 3 weeks. Ring segments of thoracic aorta and mesenteric resistance arteries (200 microns diameter) were mounted in myographs and wall force measured isometrically. The mean carotid blood pressure was reduced significantly after chronic losartan treatment (108 +/- 3 mmHg, n = 17 versus 116 +/- 2 mmHg, n = 16 in control rats, P < 0.05). In the mesenteric resistance artery the contractile response to 125 mmol/l K+, phenylephrine and angiotensin II was not affected significantly by losartan treatment. A subcontractile concentration of angiotensin II (0.1 nmol/l) induced a significant potentiation of the response to 0.03-100 mumol/l) phenylephrine (450 +/- 180 to 150 +/- 20% of the previous response to phenylephrine in control rats). This potentiation was attenuated significantly in the losartan group (240 +/- 80 to 100 +/- 15% of the previous response, P < 0.01 versus control rats). In the aorta, the response to 125 mmol/l K+ was not affect...Continue Reading

References

Jun 1, 1992·Pharmacology & Toxicology·U M SteckelingsT Unger
Jan 1, 1981·Physiological Reviews·P M VanhoutteR C Webb
Dec 1, 1993·American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation·C Baylis
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