Abstract:
:1. The acute effects of some of typical and atypical antipsychotic drugs on the dopamine release and metabolism in the dorsal striatum of freely moving rats were studied using transcerebral microdialysis technique. 2. Classical neuroleptic drugs haloperidol (0.05, 0.1 and 0.2 mg/kg), thioproperazine (0.1, 0.2 and 0.4 mg/kg) and spiperone (0.02, 0.04 and 0.07 mg/kg) administered i.p. induced pronounced elevation of extracellular level of 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) up to 250-300% to basal level while producing less increase in that of dopamine (DA) (up to 150-170%). 3. Atypical neuroleptics clozapine and thioridazine (both 2, 5 and 20 mg/kg) increased striatal DA release and DOPAC level approximately at the same degree (maximally up to 200% and 160%, respectively). 4. Dopamine D3 receptor and autoreceptor preferring antagonists (+)-UH232 and (+)-AJ76 (both 4, 7 and 14 mg/kg) more potently increased DA release in comparison with DOPAC dialysate level (+)-AJ76 elevated DA level maximally up to 330%, DOPAC-up to 250%). 5. The features of typical and atypical neuroleptics in preferential action on DA release or DOPAC output were observed in all doses of the drugs studied. 6. The ability of the drugs to affect preferentially DA release or DOPAC extracellular level in rat striatum correlates to their relative affinities at D3 and D2 DA receptors. 7. It is concluded that typical and atypical antipsychotic drugs might be clearly distinguished on the basis of their ability to affect preferentially DA synthesis/metabolism or release in rat dorsal striatum in vivo.
journal_name
Prog Neuropsychopharmacol Biol Psychiatryauthors
Rayevsky KS,Gainetdinov RR,Grekhova TV,Sotnikova TDdoi
10.1016/0278-5846(95)00267-7subject
Has Abstractpub_date
1995-12-01 00:00:00pages
1285-1303issue
8eissn
0278-5846issn
1878-4216pii
0278584695002677journal_volume
19pub_type
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