Ultrastructure of the adrenal cortex of hibernating, arousing, and euthermic dormouse, Muscardinus avellanarius.

Détails

ID Serval
serval:BIB_8EC4F28DF9C8
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Ultrastructure of the adrenal cortex of hibernating, arousing, and euthermic dormouse, Muscardinus avellanarius.
Périodique
Anatomical Record
Auteur(s)
Zancanaro C., Malatesta M., Vogel P., Fakan S.
ISSN
0003-276X (Print)
ISSN-L
0003-276X
Statut éditorial
Publié
Date de publication
1997
Volume
249
Numéro
3
Pages
359-364
Langue
anglais
Résumé
BACKGROUND: The adrenal gland is a key organ for hibernation (a condition characterized by striking reduction of body functions). Very limited information is available on the fine structure of the gland during hibernation and on the periodical arousal from hibernation.
METHODS: Dormice (Muscardinus avellanarius) were maintained in an external animal house and allowed to hibernate spontaneously (November). Arousal was induced in March by exposure to daylight. Euthermic, active dormice were captured in June. The adrenals were taken from four hibernating, three arousing, and four euthermic dormice and processed for resin embedding. The ultrastructure of the adrenal cortex was investigated by transmission electron microscopy.
RESULTS: In the zona glomerulosa of hibernating and arousing dormice, the smooth endoplasmic reticulum was prominent in comparison with euthermic animals, and mitochondria showed abundant vesicular cristae. The zona fasciculata and zona reticularis did not show consistent differences, apart from a lower cell lipid content in the outer portion of zona fasciculata of arousing dormice.
CONCLUSIONS: The zona glomerulosa showed signs of increased activity during hibernation. This finding is supported by previous biochemical data demonstrating increased production of renin and aldosterone during such extreme physiological conditions. Activation of the zona glomerulosa in hibernation is probably adaptive to a condition of drastically reduced salt intake.
Mots-clé
Adrenal Cortex/physiology, Adrenal Cortex/ultrastructure, Animals, Arousal/physiology, Hibernation/physiology, Microscopy, Electron, Reference Values, Rodentia/anatomy & histology, Rodentia/physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 18:33
Dernière modification de la notice
08/05/2019 21:53
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