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Targeting the dopamine D2 receptor in schizophrenia
1University of Toronto, Pharmacology Department, Faculty of Medicine, Medical Science Building, Room 4344, 1 King's College Circle, Toronto, M5S 1A8, Canada. Philip.Seeman@utoronto.ca
Expert Opinion on Therapeutic Targets
|July 20, 2006
Summary
The dopamine D2 receptor is the primary target for antipsychotic drugs, crucial for treating schizophrenia. Antipsychotics work by binding to D2 receptors, with efficacy linked to receptor occupancy and drug-binding characteristics.
Area of Science:
- Neuroscience
- Pharmacology
- Psychiatry
Background:
- The antipsychotic receptor was identified in 1975 using [3H]haloperidol.
- Dopamine was found to be the most potent neurotransmitter inhibiting [3H]haloperidol binding.
- This indicated the receptor was a dopamine receptor, now known as the dopamine D2 receptor.
Purpose of the Study:
- To elucidate the role of the dopamine D2 receptor in antipsychotic drug action.
- To understand the relationship between drug binding, clinical efficacy, and side effects.
- To explore the targeting of specific D2 receptor states in psychosis.
Main Methods:
- Binding assays using [3H]haloperidol to identify and characterize the antipsychotic receptor.
- Analysis of neurotransmitter inhibition of radioligand binding.
- Correlation of antipsychotic plasma concentrations with D2 receptor occupancy and clinical effects.
- Examination of D2 receptor affinity and dissociation rates in relation to side effects like Parkinsonism.
- Evaluation of D2 receptor states in animal models of psychosis.
Main Results:
- The antipsychotic receptor was identified as the dopamine D2 receptor.
- Dopamine D2 receptor binding is the primary mechanism for antipsychotic drugs.
- Clinical efficacy correlates with 60-75% D2 receptor occupancy.
- Drug binding kinetics (tight vs. loose attachment) predict side effects like Parkinsonism.
- Animal models show elevated D2High states in psychosis.
Conclusions:
- The dopamine D2 receptor is a key target for antipsychotic medications in schizophrenia.
- Antipsychotic drug efficacy and side effect profiles are directly related to their interaction with the dopamine D2 receptor.
- Antipsychotics are hypothesized to specifically target D2High states in psychosis.
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