Localization of angiotensin converting enzyme by in vitro autoradiography in the rabbit brain

Fraser M. Rogerson, Ingrid Schlawe, George Paxinos, Siew Yeen Chai, Michael J. McKinley, Frederick A.O. Mendelsohn

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Abstract

The distribution of angiotensin converting enzyme was examined in the rabbit brain by in vitro autoradiography with the specific radiolabelled inhibitor 125I-351A. In the rabbit, the highest concentrations of radioligand binding were found in the choroid plexus, blood vessels, subfornical organ, vascular organ of the lamina terminalis, area postrema and inferior olive. High levels of binding were found throughout the basal ganglia, consistent with the results in all other species studied. In the midbrain the central gray and the superior colliculus displayed high levels of binding. In the medulla oblongata high levels of binding were associated with the nucleus of the solitary tract and dorsal motor nucleus of vagus, consistent with the pattern in other species. There was moderate labelling throughout both the cerebral and cerebellar cortices, which contrasts to the rat but is consistent with the situation in primates. Angiotensin converting enzyme (ACE) is more widely distributed in rabbit brain that in rat, human and Macaca fascicularis, and the results suggest ACE has a very general role in the metabolism of neuropeptides. Inhibitors of converting enzyme are very widely used in the treatment of hypertension and heart disease, and the rabbit should provide a useful model for examining the effects of these drugs in the brain.

Original languageEnglish
Pages (from-to)227-243
Number of pages17
JournalJournal of Chemical Neuroanatomy
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Jan 1995
Externally publishedYes

Keywords

  • Brain
  • Kininase II
  • Neuropeptide
  • Peptide hydrolase
  • Renin-angiotensin system

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