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Am J Physiol Regul Integr Comp Physiol 283: R1041-R1045, 2002. First published June 27, 2002; doi:10.1152/ajpregu.00620.2001
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Vol. 283, Issue 5, R1041-R1045, November 2002

Differential evolution of blood pressure and renal lesions after RAS blockade in Lyon hypertensive rats

Delphine Bertram1, Nelly Blanc-Brunat2, Jean Sassard1, and Ming Lo1

1 Département de Physiologie et Pharmacologie Clinique, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5014, Institut Fédératif de Recherche 39, Faculté de Pharmacie, 69373 Lyon Cedex 08; and 2 Institut National de la Santé et de la Recherche Médicale Unité 80, Hôpital Edouard Herriot, 69437 Lyon Cedex 03, France

The present work aimed to assess, in Lyon hypertensive (LH) rats, whether an early and prolonged inhibition of the renin-angiotensin system (RAS) could result in a blood pressure (BP) lowering and nephroprotection that persist after its withdrawal. Male LH rats received orally from 3 to 12 wk of age either an angiotensin-converting enzyme inhibitor perindopril at the doses of 0.4 and 3 mg · kg-1 · day-1 or an AT1 receptor antagonist losartan at the dose of 10 mg · kg-1 · day-1. BP, histological changes in the kidney, and urinary protein excretion were examined during and 10 wk after cessation of the treatments. Both perindopril and losartan decreased BP, prevented renal lesions, and limited urinary protein excretion. After cessation of the treatment, BP returned to the level of never-treated LH rats in rats having received 3 mg · kg-1 · day-1 of perindopril while it remained slightly lower in those treated with 0.4 mg · kg-1 · day-1 of perindopril or with losartan. This lack of marked persistent antihypertensive effect contrasted with a durable decrease in urinary protein excretion and improvement of the renal histological lesions. In conclusion, it is possible to separate the BP-lowering effects of RAS blockade from those on glomerulosclerosis and urinary protein excretion.

angiotensin-converting enzyme; AT1 receptor antagonist; glomerulosclerosis


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