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Multiple aspects of mineralocorticoid selectivity.
1Institut National de la Santé et de la Recherche Médicale U-478, Faculté de Médecine X. Bichat-Institut Fédératif de Recherches 02, 75870 Paris Cedex 18, France. farman@bichat.inserm.fr
American Journal of Physiology. Renal Physiology
|February 24, 2001
Summary
Aldosterone
Area of Science:
- Endocrinology
- Molecular Biology
- Renal Physiology
Background:
- Aldosterone is key for renal sodium reabsorption via the mineralocorticoid receptor (MR).
- Glucocorticoid receptor (GR) is co-expressed with MR, potentially influencing aldosterone target cells.
- Steroids can bind both MR and GR, with MR having equal affinity for aldosterone and glucocorticoids.
Purpose of the Study:
- To explore mechanisms enabling specific aldosterone effects despite high glucocorticoid levels.
- To understand how MR and GR interactions fine-tune cellular functions.
- To investigate alterations in these interactions in pathophysiological conditions.
Main Methods:
- Review of cellular and molecular mechanisms governing corticosteroid receptor function.
- Analysis of enzyme activity (11beta-hydroxysteroid dehydrogenase) in glucocorticoid metabolism.
- Examination of receptor dimerization and transcription factor interactions.
Main Results:
- Local metabolism inactivates glucocorticoids, aiding aldosterone specificity.
- Intrinsic MR properties and differential ligand contacts contribute to selectivity.
- MR/GR dimerization and interactions with transcription factors modulate cellular responses.
Conclusions:
- Multiple mechanisms ensure aldosterone-specific regulation in target cells.
- Cellular responses are fine-tuned by corticosteroid cooperation and tissue-specific factors.
- Dysregulation of these interactions can occur in disease states.