Camier M, Barre N, Cohen P. Hypothalamic biosynthesis and transport of neurophysins and their precursors to the rat brain stem.
Brain Res 1985;
334:1-8. [PMID:
3995305 DOI:
10.1016/0006-8993(85)90560-8]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Twenty-four hours after the injection of [35S]cysteine near either the rat paraventricular nuclei or the supraoptic nuclei, the [35S]neurophysin-like proteins of the brain stem were extracted, immunoprecipitated with anti-bovine neurophysins antibodies and analyzed. They consisted essentially of species behaving as neurophysin on sodium dodecyl sulfate--polyacrylamide gel electrophoresis. There was a very low percentage of neurophysins precursors which could be characterized in the paraventricular nuclei. In the rats pretreated by colchicine, the [35S]neurophysins were not detected in the brain stem, while they appeared in the paraventricular nuclei indicating that the precursors have been processed and the transport inhibited. These results suggest that: (i) both the biosynthetic and transport events in the hypothalamo-brain stem pathway are comparable to those occurring in the hypothalamo-neurohypophyseal tract; (ii) this pathway originates both from the supraoptic and paraventricular nuclei. Moreover, they indicate that processing is essentially complete in the hypothalamus of colchicine-pretreated animals. This provides further support to a model associating enzymes with both the endoplasmic reticulum membranes and the derived corresponding secretory vesicles.
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