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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Role of the alpha(1)- and alpha(2)-adrenoceptors of the paraventricular nucleus on the water and salt intake, renal excretion, and arterial pressure induced by angiotensin II injection into the medial septal area.
Brain Research Bulletin 2001 April
In this study we investigated the influence of alpha-adrenergic antagonists injections into the paraventricular nucleus (PVN) of the hypothalamus on the thirst and salt appetite, diuresis, natriuresis, and pressor effects of angiotensin II (ANG II) stimulation of medial septal area (MSA). ANG II injection into the MSA induced water and sodium intake, diuresis, natriuresis, and pressor responses. The previous injection of prazosin (an alpha(1)-adrenergic antagonist) into the PVN abolished, whereas previous administration of yohimbine (an alpha(2)-adrenergic antagonist) into the PVN increased the water and sodium intake, urinary, natriuretic, and pressor responses induced by ANG II injected into the MSA. Previous injection of a nonselective alpha-adrenergic antagonist, regitin, into the PVN blocked the urinary excretion, and reduced the water and sodium intake, sodium intake, and pressor responses induced by ANG II injected into the MSA. The present results suggest that alpha-adrenergic pathways involving the PVN are important for the water and sodium excretion, urine and sodium excretion, and pressor responses, induced by angiotensinergic activation of the MSA.
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