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Chronic antidepressant therapy and associated changes in central monoaminergic receptor functioning
Pharmacology & Therapeutics
|January 1, 1983
Summary
Antidepressant effects stem from long-term adaptive changes, not acute drug actions. Chronic therapy alters receptor functioning, suggesting complex mechanisms beyond neurotransmitter levels.
Area of Science:
- Neuroscience
- Pharmacology
- Psychiatry
Background:
- Acute antidepressant actions do not fully explain clinical efficacy.
- A delay in therapeutic effect suggests chronic adaptations are crucial.
Purpose of the Study:
- To explore the molecular mechanisms of antidepressant action.
- To investigate adaptive changes in receptor functioning following chronic antidepressant therapy.
Main Methods:
- Review of animal studies on receptor adaptations (presynaptic and postsynaptic).
- Analysis of electrophysiological and behavioral data.
- Examination of radioligand binding studies.
Main Results:
- Chronic antidepressant therapy down-regulates presynaptic alpha 2 and dopamine (DA) receptors.
- The norepinephrine (NE)-coupled adenylate cyclase system is down-regulated by various antidepressant treatments.
- Long-term therapy up-regulates central alpha 1 and serotonin (5-HT) receptor functioning, though binding data is inconsistent.
Conclusions:
- Antidepressant mechanisms are likely complex, involving adaptive receptor changes.
- Multiple sites of action may exist, challenging a single common mechanism theory.
- Further research, including peptide co-transmitter roles, is needed to clarify antidepressant efficacy.