Inositol 1,4,5-trisphosphate receptors: immunohistochemical localization to discrete areas of rat central nervous system - PubMed (original) (raw)
Inositol 1,4,5-trisphosphate receptors: immunohistochemical localization to discrete areas of rat central nervous system
A H Sharp et al. Neuroscience. 1993 Apr.
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.
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