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Platelet membrane alpha 2-adrenergic receptors in depression
1Division of Biochemistry, Institutions Universitaires de Psychiatrie, Geneva Medical School, Switzerland.
Psychiatry Research
|September 1, 1992
Summary
Depressed patients show reduced alpha 2-adrenergic receptor affinity. Magnesium levels correlate inversely with receptor density, suggesting complex regulation in depressive syndromes.
Area of Science:
- Neuroscience
- Psychiatry
- Pharmacology
Background:
- Alpha 2-adrenergic receptors play a role in mood regulation.
- Dysregulation of these receptors has been implicated in depressive disorders.
Purpose of the Study:
- To investigate alpha 2-adrenergic receptor characteristics in depressed patients.
- To explore the relationship between receptor function, plasma magnesium, and MHPG levels in depression.
Main Methods:
- Platelet membranes from 30 depressed patients and 30 controls were analyzed.
- Binding assays measured alpha 2-adrenergic receptor density and affinity using 3H-UK 14304.
- Plasma magnesium and free 3-methoxy-4-hydroxyphenylglycol (MHPG) concentrations were measured.
Main Results:
- Depressed patients exhibited decreased alpha 2-adrenergic receptor affinity (higher Kd) but unchanged receptor density (Bmax).
- A positive correlation between Bmax and Kd was observed in patients, suggesting compensatory mechanisms.
- Higher plasma magnesium levels in depressed patients were negatively correlated with receptor density.
- Antidepressant treatment increased receptor affinity and decreased receptor density.
Conclusions:
- Alpha 2-adrenergic receptors are likely hyposensitive in depressive syndromes.
- Complex multifactorial regulation involving magnesium is suggested.
- Findings support a role for alpha 2-adrenergic receptor dysfunction in depression pathophysiology.