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Immuno-cytochemical Demonstration of the Inability of the Homozygous Brattleboro Rat to Synthesize Vasopressin and Vasopressin-associated Neurophysin

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Journal Cell Tissue Res
Date 1976 Jan 27
PMID 1248028
Citations 17
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Abstract

Immuno-enzyme cytochemical investigations have shown that, (1) the hypothalamic supraoptic and paraventricular nuclei of the Brattleboro rat, as in the normal rat, contain separate neurons which produce oxytocin + neurophysin; (2) the hereditary inability of the Brattleboro rat to synthesize vasopressin and its associated neurophysin is due to a biochemical defect of separate "neurophysin-vasopressin" neurons in the supraoptic and the paraventricular nuclei. These observations strongly support the hypotheses that (1) vasopressin and its associated neurophysin are formed via a common precursor, and (2) the initial point of intracellular appearance of the hereditary defect in the Brattleboro rat lies in the synthesis of this precursor, which occurs on ribosomes. Moreover, observations have demonstrated that, in the Brattleboro rat, in addition to the hereditary inability of the hypothalamic magnocellular neurosecretory system to synthesize vasopressin, there also exists a similar hereditary defect in the hypothetical parvicellular suprachiasmatic-median eminence neurosecretory system.

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