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Mood stabilizers inhibit glucocorticoid receptor function in LMCAT cells
Agnieszka Basta-Kaim1, Bogusława Budziszewska, Lucylla Jaworska-Feil
1Department of Endocrinology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Kraków, Poland.
European Journal of Pharmacology
|July 14, 2004
Summary
Mood stabilizers like lithium, valproate, and carbamazepine inhibit stress hormone effects by impacting glucocorticoid receptor function. Valproate specifically reduced receptor levels, suggesting a novel therapeutic mechanism.
Area of Science:
- Neuropharmacology
- Molecular Biology
Background:
- Mood stabilizers are known to mitigate stress responses, but their precise interaction with the glucocorticoid receptor pathway remains unclear.
- Understanding this interaction is crucial for developing targeted therapies for stress-related neurological conditions.
Purpose of the Study:
- To investigate the effects of lithium, valproate, and carbamazepine on glucocorticoid receptor-mediated gene expression.
- To elucidate the molecular mechanisms underlying the interaction between mood stabilizers and the glucocorticoid receptor.
Main Methods:
- Utilized mouse fibroblast cells (L929) transfected with a reporter plasmid (MMTV-CAT) to assess glucocorticoid receptor activity.
- Administered varying concentrations of lithium, valproate, carbamazepine, and amphetamine to treated cells.
- Measured reporter gene activity and glucocorticoid receptor levels in cellular fractions.
- Employed specific inhibitors, including a c-Jun N-terminal kinase (JNK)-mitogen-activated protein kinase (MAPK) inhibitor.
Main Results:
- Lithium, valproate, and carbamazepine dose-dependently inhibited corticosterone-induced reporter gene activity.
- Valproate uniquely reduced glucocorticoid receptor levels in both cytosolic and nuclear fractions.
- The inhibitory effect of valproate was partially reversed by a JNK-MAPK inhibitor, suggesting a role for this pathway.
- Amphetamine did not affect glucocorticoid receptor-mediated transcription.
Conclusions:
- Mood stabilizers directly modulate glucocorticoid receptor function, offering a potential mechanism for their therapeutic effects.
- Valproate's impact on glucocorticoid receptor levels and its interaction with the JNK-MAPK pathway represent a novel finding.
- These results support the hypothesis that targeting the glucocorticoid receptor pathway is a key mechanism for mood stabilizers in managing stress-related central nervous system effects.