Inositol 1,4,5-trisphosphate receptors: Immunohistochemical localization to discrete areas of rat central nervous system

A. H. Sharp, T. M. Dawson, C. A. Ross, M. Fotuhi, R. J. Mourey, S. H. Snyder

Research output: Contribution to journalArticlepeer-review

Abstract

The second messenger inositol 1,4,5-trisphosphate triggers the release of intracellular Ca2+ stores upon binding to the inositol 1,4,5-trisphosphate receptor protein, a calcium channel that has been purified and molecularly cloned. To clarify the roles of inositol 1,4,5-trisphosphate receptor in the central nervous system, we have examined in detail the distribution of inositol 1,4,5-trisphosphate receptors in the rat brain and spinal cord using immunohistochemical methods. Inositol 1,4,5-trisphosphate receptors are present in neuronal cells, fibers and terminals in a wide distribution of areas throughout the central nervous system. These include a number of areas not previously reported, such as the olfactory bulb, thalamic nuclei and dorsal horn of the spinal cord. In addition, we have noted a strikingly high density of inositol 1,4,5-trisphosphate receptors in circumventricular organs and neuroendocrine structures such as the area postrema, choroid plexus, subcommisural organ, pineal gland and pituitary. The distribution of inositol 1,4,5-trisphosphate receptors in discrete structures throughout the central nervous system, including interconnected neuronal systems and neuroendocrine and circumventricular organ structures, presumably reflects the importance of Ca2+ release mediated by the phosphoinositide second messenger system in control of diverse physiological processes.

Original languageEnglish (US)
Pages (from-to)927-942
Number of pages16
JournalNeuroscience
Volume53
Issue number4
DOIs
StatePublished - Apr 1993

ASJC Scopus subject areas

  • Neuroscience(all)

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