Wagner, C and Kees, F and Kramer, BK and Kurtz, A (1997) Role of sympathetic nerves for the stimulation of the renin system by angiotensin II receptor blockade. JOURNAL OF HYPERTENSION, 15 (12). pp. 1463-1469. ISSN 0263-6352, 1473-5598
Full text not available from this repository.Abstract
Objective To assess the relevance of sympathetic nerves for the stimulation of renin secretion and renin gene expression during effective angiotensin II type 1 receptor blockade in vivo. Methods Male Sprague-Dawley rats were treated with the angiotensin II type 1-receptor blocker losartan (40 mg/kg) for 3 days. To examine the role of renal sympathetic nerves in the stimulation of the renin system by losartan, left kidneys were denervated 4 days prior to the treatment with losartan. Also, to examine the role of circulating catecholamines in the stimulation of the renin system by losartan, the animals were administered a combination treatment of losartan with the beta(1)-adrenoreceptor blocker metoprolol (50 mg/kg per day) for 3 days. Results Losartan treatment increased plasma renin activity about sevenfold and renal renin messenger RNA (mRNA) levels about fivefold and decreased systolic blood pressure from 118 to 95 mmHg. Administration of losartan elevated renin mRNA both in the innervated and in the denervated kidneys to the same level as it did in kidneys of normal animals. Losartan treatment increased plasma renin activity and renal renin mRNA levels in the beta(1)-blocker-treated rats to the same extent as it did in animals administered losartan only. Conclusion These findings suggest that, under sub-chronic treatment with hypotensive doses of angiotensin II receptor blockers, sympathetic outflow plays no important mediator role in the characteristic stimulation of renin secretion and renin gene expression, suggesting that it is mainly a direct disinhibition of angiotensin II's action on the level of juxtaglomerular cells that accounts for the effect.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENE-EXPRESSION; MESSENGER-RNA; JUXTAGLOMERULAR CELLS; FEEDBACK-REGULATION; BLOOD-PRESSURE; NITRIC-OXIDE; RENAL NERVES; RAT; SECRETION; INHIBITION; plasma renin activity; renin messenger RNA; renal denervation; losartan; metoprolol |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50364 |
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