Abstract
Quantitative in situ hybridization on rat coronal brain sections with radiolabelled oligonucleotide probes was performed to investigate the effects of antipsychotic drugs on mRNA levels of regulator of G-protein signalling (RGS) 2 and c-fos. This study demonstrated a similar increase of RGS2 mRNA level in the striatum upon both a single and a 21-day treatment with either haloperidol (2 mg/kg) or risperidone (7.5 mg/kg) in contrast to clozapine (20 mg/kg). Otherwise, the acute c-fos mRNA induction in the striatum was abolished by 74 to 89% upon chronic treatment with either haloperidol or risperidone. In conclusion, the induction of RGS2 mRNA in the striatum, in contrast to the immediate early gene c-fos mRNA, is preserved upon chronic treatment with haloperidol and risperidone.
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