In vivo nuclear translocation of mineralocorticoid and glucocorticoid receptors in rat kidney: differential effect of corticosteroids along the distal tubule.

Détails

ID Serval
serval:BIB_FC152CAB4BD7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
In vivo nuclear translocation of mineralocorticoid and glucocorticoid receptors in rat kidney: differential effect of corticosteroids along the distal tubule.
Périodique
American Journal of Physiology. Renal Physiology
Auteur⸱e⸱s
Ackermann D., Gresko N., Carrel M., Loffing-Cueni D., Habermehl D., Gomez-Sanchez C., Rossier B.C., Loffing J.
ISSN
1522-1466 (Electronic)
ISSN-L
1522-1466
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
299
Numéro
6
Pages
F1473-F1485
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Aldosterone and corticosterone bind to mineralocorticoid (MR) and glucocorticoid receptors (GR), which, upon ligand binding, are thought to translocate to the cell nucleus to act as transcription factors. Mineralocorticoid selectivity is achieved by the 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2) that inactivates 11β-hydroxy glucocorticoids. High expression levels of 11β-HSD2 characterize the aldosterone-sensitive distal nephron (ASDN), which comprises the segment-specific cells of late distal convoluted tubule (DCT2), connecting tubule (CNT), and collecting duct (CD). We used MR- and GR-specific antibodies to study localization and regulation of MR and GR in kidneys of rats with altered plasma aldosterone and corticosterone levels. In control rats, MR and GR were found in cell nuclei of thick ascending limb (TAL), DCT, CNT, CD cells, and intercalated cells (IC). GR was also abundant in cell nuclei and the subapical compartment of proximal tubule (PT) cells. Dietary NaCl loading, which lowers plasma aldosterone, caused a selective removal of GR from cell nuclei of 11β-HSD2-positive ASDN. The nuclear localization of MR was unaffected. Adrenalectomy (ADX) resulted in removal of MR and GR from the cell nuclei of all epithelial cells. Aldosterone replacement rapidly relocated the receptors in the cell nuclei. In ASDN cells, low-dose corticosterone replacement caused nuclear localization of MR, but not of GR. The GR was redistributed to the nucleus only in PT, TAL, early DCT, and IC that express no or very little 11β-HSD2. In ASDN cells, nuclear GR localization was only achieved when corticosterone was replaced at high doses. Thus ligand-induced nuclear translocation of MR and GR are part of MR and GR regulation in the kidney and show remarkable segment- and cell type-specific characteristics. Differential regulation of MR and GR may alter the level of heterodimerization of the receptors and hence may contribute to the complexity of corticosteroid effects on ASDN function.
Mots-clé
11-beta-Hydroxysteroid Dehydrogenase Type 2/metabolism, Adrenalectomy, Aldosterone/metabolism, Aldosterone/pharmacology, Animals, Antibody Specificity, Corticosterone/administration & dosage, Corticosterone/metabolism, Kidney Tubules, Distal/drug effects, Kidney Tubules, Distal/metabolism, Male, Mice, Nephrons/metabolism, Protein Transport, RNA, Messenger/metabolism, Rats, Receptors, Glucocorticoid/immunology, Receptors, Glucocorticoid/metabolism, Receptors, Mineralocorticoid/immunology, Receptors, Mineralocorticoid/metabolism, Sodium, Dietary/administration & dosage, Sodium, Dietary/pharmacology
Pubmed
Web of science
Création de la notice
08/03/2011 16:45
Dernière modification de la notice
20/10/2020 15:41
Données d'usage