PMID: 8590914Mar 1, 1995Paper

Neurobiology of central angiotensin III and dipsogenesis

Biological Signals
C C YangJ Y Chan

Abstract

This review provides a synopsis of the physiologic role of central angiotensin III (AIII), the biologically active degradative product of angiotensin II, in dipsogenesis. The integrity of the central noradrenergic system is essential to the elicitation of polydipsia by AIII. It is conceivable that synaptically released norepinephrine may act on the alpha 1-adrenoceptors to potentiate the drinking response to the heptapeptide. This release, however, may be subjected to a tonic inhibition by the alpha 2-adrenoceptors. Chronic intracerebroventricular administration of AIII fails to produce sustained drinking behavior in spontaneously hypertensive rats. Behavioral and electrophysiologic observations suggest that this is because of the development of early desensitization of at least the angiotensin receptors at the subfornical organ, a major target site for AIII-induced dipsogenesis. This process is exacerbated by a suggested dysfunction of the central degradative enzyme for AIII in this strain of rat. Recent results suggest that it is likely that neurons in the caudal hypoglossal nucleus may serve as the final common pathway for AIII-induced drinking response. Furthermore, an excitatory link between the nucleus reticularis giganto...Continue Reading

Citations

Nov 25, 1997·Brain Research. Brain Research Reviews·J W Wright, J W Harding

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