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Cytochemical duality of neurosecretory material in the hypothalamo-posthypophysial system of the rat as related to hormonal content

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Summary

Cytochemical methods using silver proteinate, silver methenamine and potassium ferrocyanide + OsO4 for ultrastructural detection of glycoproteins allow, in the posthypophysis and the magnocellular nuclei of the rat, differentiation of two types of fibres and neurons: one type containing negative granules with a homogeneous content of low electron density, the second type containing granules which demonstrate a ring-shaped deposit either of silver or of potassium ferrocyanide-osmium complex, likely to be related to a glycoproteic component. The difference between these two types is increased by prestaining “en bloc” with uranyl acetate before the silver proteinate reaction. A similar investigation was carried out on the vasopressin deficient Brattleboro rat; the neurosecretory material, present in some endings and neurones only, is of the nonreactive type, so that it appears justified to correlate the reactivity of granules with vasopressin, and consequently to distinguish neurones and fibres containing vasopressin from those in which oxytocin is quantitatively the main hormonal peptide. This conclusion is strongly supported by the fact that percentages of reactive and negative endings, as determined on this basis in the posthypophysis of normal rats from two different strains, are in good agreement with biochemical data reported in the literature.

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  1. Laboratoire d'Histologie I de la Faculté de Médecine, Equipe de Recherche Associée au C.N.R.S. n∘ 322, Marseille, France

    F. Tasso, S. Rua &  D. Picard

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  1. F. Tasso
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  2. S. Rua
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  3. D. Picard
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Tasso, F., Rua, S. & Picard, D. Cytochemical duality of neurosecretory material in the hypothalamo-posthypophysial system of the rat as related to hormonal content. Cell Tissue Res. 180, 11–29 (1977). https://doi.org/10.1007/BF00227027

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