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Brain kinins are responsible for the pressor effect of intracerebroventricular captopril in spontaneously hypertensive rats

Madeddu, Paolo Roberto and Glorioso, Nicola and Soro, Aldo and Tonolo, Giancarlo and Manunta, Paolo and Troffa, Chiara and Demontis, Maria Piera and Varoni, Maria Vittoria and Anania, Vittorio Domenico (1990) Brain kinins are responsible for the pressor effect of intracerebroventricular captopril in spontaneously hypertensive rats. Hypertension, Vol. 15 (4), p. 407-412. eISSN 1524-4563. Article.

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Abstract

The role of the brain kallikrein-kinin system in the regulation of arterial blood pressure of normotensive and spontaneously hypertensive rats was evaluated. Intracerebroventricular administration of the kinin antagonist [DArg°]Hyp3-Thi5'8[DPhe7] bradykinin caused no change in mean blood pressure in Wistar-Kyoto, Sprague-Dawley, or spontaneously hypertensive rats. The antagonist proved to be very potent in blocking the pressor effect of intracerebroventricular bradykinin (32±3 vs. 3±1 mm Hg,p<0.01). It was specific, as the pressor effect induced by other unrelated peptides was similar during the infusion of either vehicle or kinin antagonist (angiotensin II, 25±4 vs. 26±2 mm Hg; prostaglandin E2, 48±3 vs. 47±8 mm Hg; norepinephrine, 17±2 vs. 18±2 mm Hg; leucine-enkephaline, 15±2 vs. 16±1 mm Hg; neurotensin, 18±2 vs. 19±1 mm Hg; substance P, 19±2 vs. 19±2 mm Hg). Intracerebroventricular administration of 1 mg captopril, an inhibitor of kininase II (one of the enzymes responsible for kinin degradation), caused no change in mean blood pressure in normotensive rats, whereas it increased mean blood pressure by 44±9 mm Hg (p<0.01) in spontaneously hypertensive rats. This increase in mean blood pressure was blocked and then reversed into a hypotensive effect (22 ±6 mm Hg, p<0.05) during the infusion of kinin antagonist. Our data suggest that the pressor effect induced by intracerebroventricular captopril is due to a transient elevation in endogenous brain kinin levels, supporting the hypothesis that the brain kallikrein-kinin system plays a role in the central regulation of blood pressure in spontaneously hypertensive rats.

Item Type:Article
ID Code:866
Status:Published
Refereed:Yes
Uncontrolled Keywords:Kallikrein-kinin system, kininase inhibitor, blood pressure
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/07 Farmacologia e tossicologia veterinaria
Area 06 - Scienze mediche > MED/09 Medicina interna
Divisions:001 Università di Sassari > 03 Istituti > Clinica medica generale e terapia medica
001 Università di Sassari > 01 Dipartimenti > Biologia animale
Publisher:Lippincott Williams & Wilkins
eISSN:1524-4563
Copyright Holders:© 1990 American Heart Association
Deposited On:18 Aug 2009 10:03

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