Distribution of [125I]angiotensin II binding sites in the rat brain: a quantitative autoradiographic study

Neuroscience
D R GehlertJ K Wamsley

Abstract

Angiotensin II receptors have been localized by quantitative autoradiography in the rat central nervous system after labeling with [125I]angiotensin II. A highly discrete distribution of these receptors was found throughout the rat brain. The highest density was seen in regions of the medulla, hypothalamus and circumventricular organs where angiotensin II could potentially produce cardiovascular, dipsogenic and neuroendocrine responses. The distribution of angiotensin II receptors correlates relatively well with the previously reported distribution of angiotensin immunoreactive nerve terminals as well as areas determined by various physiological techniques to be sensitive to angiotensin II. Finally, the anatomical localization of angiotensin II receptor populations has revealed several areas of the brain where the effects of this peptide have not been investigated. Many of these nuclei are involved in the transmission and processing of somatic and visceral sensory information. These results suggest a broader role for the central renin-angiotensin system in modulating several types of sensory input.

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