Changes in dopamine D1, D2 and D3 receptor mRNA levels in rat brain following antipsychotic treatment

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Abstract
The effects of administration of antipsychotic drugs (1–32 days, twice per day) on the rat brain mRNA levels of dopamine D1, D2 and D3 receptors has been assessed by a novel procedure utilising solution hybridisation with oligonucleotides. Saline and sulpiride (10 mg/kg/injection) had no effect on D1, D2 and D3 receptor mRNA levels. Haloperidol (1.5 mg/kg/injection) elicited increases in D1, D2 and D3 receptor mRNA levels of 100%, 100% and 300%, respectively, after 32 days and loxapine (2 mg/kg/injection) elicited increases of 450%, 150% and 550%, respectively. These results indicate that the up-regulation of dopamine receptors may be associated with the occurrence of tardive dyskinesia but not the clinical mode of action of antipsychotics.