PMID: 11903508Mar 21, 2002Paper

Non-contribution of renin-angiotensin system to pressor response to N(G)-nitro-L-arginine in dogs

Fundamental & Clinical Pharmacology
Tomohisa IshikawaKoichi Nakayama

Abstract

Acute systemic blockade of nitric oxide (NO) production by nonselective inhibitors of NO synthase (NOS) isoforms, including N(G)-nitro-L-arginine methyl ester (L-NAME) and N(G)-nitro-L-arginine (L-NNA), has been shown to produce a long-lasting pressor response in conscious and anaesthetised animals. The present study was undertaken to clarify whether the renin-angiotensin system contributes to the development of this pressor response to L-NNA. Systemic blood pressure and heart rate were continuously monitored in dogs anaesthetised with pentobarbital. Plasma renin activity in the blood obtained from a femoral artery and a renal vein was measured by use of radioimmunoassay. The acute pressor response produced by the intravenous administration of L-NNA was accompanied by reduced renin activity in both systemic and renal vascular beds. Captopril, an angiotensin converting enzyme inhibitor, counteracted the pressor response to L-NNA, whereas candesartan, an angiotensin AT1-receptor antagonist, had no apparent effect on it. The counteraction by captopril of the L-NNA-induced pressor response was likely to be attributable to enhancement by captopril of depressor responses to bradykinin, as HOE-140, a bradykinin B2 receptor antagonist,...Continue Reading

References

Mar 1, 1991·American Journal of Hypertension·N JaiswalC M Ferrario
Oct 1, 1990·Physiological Reviews·E HackenthalR Taugner
Nov 13, 1990·European Journal of Pharmacology·H M VargasG Chaudhuri
May 1, 1990·Hypertension·S M GardinerS Moncada
May 1, 1989·Proceedings of the National Academy of Sciences of the United States of America·D D ReesS Moncada
Dec 4, 1995·European Journal of Pharmacology·T NakaharaK Nakayama
Jun 1, 1997·Kidney International·P L TharauxC Chatziantoniou
Nov 20, 1998·Hypertension·N KuriharaO A Carretero

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