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Do antidepressants stabilize mood through actions on the hypothalamic-pituitary-adrenocortical system?
N Barden1, J M Reul, F Holsboer
1Max-Planck Institute of Psychiatry, Munich, Germany.
Trends in Neurosciences
|January 1, 1995
Summary
Antidepressant treatment may normalize the overactive hypothalamic-pituitary-adrenocortical (HPA) system in depression by increasing corticosteroid receptors, enhancing feedback inhibition and improving mood.
Area of Science:
- Neuroendocrinology
- Psychiatry
- Pharmacology
Background:
- Severe depression is linked to hyperactivity of the hypothalamic-pituitary-adrenocortical (HPA) system.
- This hyperactivity may stem from impaired glucocorticoid feedback inhibition.
- Neuroendocrine changes, including premature dexamethasone escape, are common in depressed patients.
Purpose of the Study:
- To investigate the role of corticosteroid receptors in the HPA system's response to antidepressant pharmacotherapy.
- To explore how antidepressants might normalize HPA system activity and alleviate depressive symptoms.
Main Methods:
- Analysis of changes in mineralocorticoid and glucocorticoid receptor mRNA levels and hormone-binding activities.
- Treatment of cell lines and animal models with antidepressants.
- Correlation of the timecourse of receptor changes with clinical improvement in depression.
Main Results:
- Antidepressant treatment increased both mineralocorticoid- and glucocorticoid-receptor mRNA levels and hormone-binding activities in cell lines and animals.
- The observed changes in corticosteroid receptors align with the timeline of clinical mood improvement in depression.
Conclusions:
- Antidepressants may exert their mood-elevating effects by enhancing corticosteroid receptor function.
- This enhancement leads to improved feedback inhibition of the HPA system, normalizing its activity.
- Long-term effects on HPA regulation are a key mechanism in antidepressant action for depression.