Neuroleptic drugs of various types were more potent inhibitors of dopamine-sensitive production of adenosine cyclic 39,59-monophosphate in homogenates of rat brain striatum than non-neuroleptic drugs of similar structures. The most potent drugs were phenothiazines and thioxanthenes with a -CF3 group in position 2 of the tricyclic system and a piperazino side chain. There were also large differences in the effects of cis and trans isomers of thioxanthenes in which the 2-substituent and the side chain are on the same or opposite side of the double bond connecting the side chain to the ring system. Thus α-flupenthixol, α-clopenthixol, and α-chlorprothixene, which are the cis isomers, were considerably more potent than the corresponding β-isomers of the same drugs. α-Flupenthixol was also considerably more potent than the β-isomer in antagonizing the effect of dopamine on cyclic AMP production in the olfactory tubercle and nucleus accumbens, and in antagonizing the potent dopamine agonist 2-amino-6,7-dihydroxy-1,2,3,4-tetrahydronaphthalene in the striatum. These results are discussed in relation to the hypothesis that neuroleptic activity may be related to the blockade of dopamine receptors in the central nervous system.
The Action of Neuroleptic Drugs on Dopamine-Stimulated Adenosine Cyclic 3',5'-Monophosphate Production in Rat Neostriatum and Limbic Forebrain
Richard J. Miller,A. Horn,L. Iversen
Published 1974 in Molecular Pharmacology
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- Publication year
1974
- Venue
Molecular Pharmacology
- Publication date
1974-09-01
- Fields of study
Medicine, Chemistry
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