Summary
In order to induce a modification of the plasmatic electrolyte composition, newts (Triturus cristatus) are placed into a potassium chloride solution (KCl 5‰), while controls are kept in tap water. All animals are previously hypophysectomized.
8 days after the beginning of the experiment, the interrenal cells of the hypophysectomized newts kept in KCl solution exhibit a very strong steroidogenic activity, as evidenced by a striking lipid depletion, an increase in the number of mitochondria and a considerable development of the agranular tubular endoplasmic reticulum. On the other hand, the Δ5-3β-hydroxysteroid dehydrogenase reaction is notably intensified. All the cells of the interrenal tissue are affected by the stimulatory effect of the KCl solution.
Control animals show only reduced steroidogenic activity of their interrenal cells, as demonstrated both by the morphology of these cells and the weak Δ5-3β-hydroxysteroid dehydrogenase reaction.
The mechanisms involved in the stimulatory effect on steroidogenesis of the variation of the electrolyte composition of the plasma are discussed.
Résumé
Dans le but de modifier la composition électrolytique du plasma, des Tritons à crête (Triturus cristatus) sont placés dans une solution de chlorure de potassium (KCl 5‰). D'autres Tritons (témoins) sont placés dans de l'eau du robinet. Tous les animaux ont été préalablement hypophysectomisés.
8 jours après le début de l'expérience, les cellules interrénales des Tritons hypophysectomisés placés dans la solution de KCl présentent une activité stéroidogénique élevée, se traduisant notamment par une forte déplétion lipidique, une augmentation du nombre des mitochondries et un développement important du réticulum endoplasmique agranulaire et tubulaire; d'autre part, la réaction Δ5-3β-hydroxystéroide deshydrogénasique est intense. Toutes les cellules du tissu interrénal sont fortement stimulées dans ces conditions.
Les cellules interrénales des Tritons témoins présentent par contre une activité stéroidogénique très réduite, comme en témoignent leur structure et la faible intensité de la réaction Δ5-3β-hydroxystéroide deshydrogénasique.
Les mécanismes précis pouvant être à l'origine de la stimulation des cellules interrénales de Tritons hypophysectomisés placés dans la solution de KCl sont discutés.
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Berchtold, JP. Effets de modifications de la composition électrolytique du plasma sur la structure et la fonction des cellules interrénales (corticosurrénaliennes) d'un Amphibien Urodèle: Triturus cristatus . Z. Zellforsch 139, 47–59 (1973). https://doi.org/10.1007/BF00307460
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DOI: https://doi.org/10.1007/BF00307460