Centrally infused atrial natriuretic polypeptide attenuates exaggerated salt appetite in spontaneously hypertensive rats

Circulation Research
H ItohA Matsushita

Abstract

We have previously shown that atrial natriuretic polypeptide is present in the brain with the highest concentration in the hypothalamus and septum and that intracerebroventricular injection of atrial natriuretic polypeptide inhibits water drinking induced by centrally injected angiotensin II or 24-hour water deprivation in rats. To study further the role of brain atrial natriuretic polypeptide in the control of water and electrolyte balance, the effect of chronic intracerebroventricular infusion of atrial natriuretic polypeptide on salt appetite in spontaneously hypertensive rats and normotensive Wistar-Kyoto rats was examined with a free-choice, two-bottle preference test. The intracerebroventricular infusion of 100 ng/hour and 500 ng/hour of alpha-human atrial natriuretic polypeptide preferentially suppressed the intake of 0.30 M NaCl solution and attenuated the elevated preference for the hypertonic saline in spontaneously hypertensive rats while centrally infused alpha-human atrial natriuretic polypeptide had no significant effects on drinking behavior in Wistar-Kyoto rats. Blood pressure did not change significantly throughout the experiment in either rat strain. It is concluded that the exaggerated salt appetite in sponta...Continue Reading

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Related Concepts

Metazoa
Diastolic Blood Pressure
Brain
Hypertensive Disease
Atrial Natriuretic Factor Precursors
Rats, Inbred SHR
Rats, Inbred WKY
Sodium Chloride, (24)NaCl
Water-Electrolyte Balance
Rats, Laboratory

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