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Journal of Neuroscience, Vol 4, 1118-1129, Copyright © 1984 by Society for Neuroscience

ARTICLE

Corticotropin-releasing factor: co-expression within distinct subsets of oxytocin-, vasopressin-, and neurotensin-immunoreactive neurons in the hypothalamus of the male rat

PE Sawchenko, LW Swanson and WW Vale

Two immunohistochemical methods that allow the concurrent localization of neuroactive substances within individual neurons have been used to identify, count, and chart the distribution of corticotropin-releasing factor (CRF)-immunoreactive cells in the paraventricular nucleus of the hypothalamus (PVH) that may also contain an additional peptide. In colchicine-treated male rats a moderate number of oxytocin-stained cells, localized primarily in a discrete, anterior part of the magnocellular division of the nucleus, was found also to stain positively for CRF. Similarly, oxytocin and CRF immunoreactivity were jointly expressed in magnocellular neurons distributed diffusely in the supraoptic nucleus. Smaller numbers of vasopressin- and neurotensin- stained neurons centered in specific parts of the parvocellular division of the PVH were stained with antisera against CRF. Possible mechanisms whereby the function of subsets of magnocellular and parvocellular neurosecretory neurons can be modulated differentially are discussed.

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