Abstract
The pharmacological profile of the enantiomers of the proposed selective dopamine (DA) autoreceptor agonist 3-PPP [3-(3-hydroxyphenyl)-N-n-propylpiperidine] has been studied. In vitro both enantiomers showed weak DA agonistic activity, and (-)-3-PPP some DA antagonistic effect on DA-stimulated adenylate cyclase activity. Both enantiomers in low doses had a similar profile in vivo: Inhibition of locomotor activity of mice and rats, induction of contralateral circling behaviour in 6-hydroxy-DA-lesioned rats and an emetic effect in dogs. At higher doses, differential effects of the enantiomers were found: (+)-3-PPP induced hyperactivity, weak stereotyped behaviour and ipsilateral circling in hemitransected rats. (-)-3-PPP had depressant effects in high doses, inhibited d-amphetamine-induced hyperactivity and d-amphetamine-, methylphenidate- and apomorphine-induced stereotyped licking/biting in rats and antagonized apomorphine-induced emesis in dogs. However, (+)-3-PPP also showed a weak antagonistic activity against d-amphetamine-induced hyperactivity and d-amphetamine-and apomorphine-induced stereotypy in rats and inhibited apomorphine-induced emesis in dogs.
It is suggested that both enantiomers have significant effects on postsynaptic DA receptors in high doses: (-)-3-PPP with weak antagonistic activity in some test models and (+)-3-PPP with agonistic and antagonistic effect. Since these effects of (+)-3-PPP were of low intensity at high doses, (+)-3-PPP may be a partial DA agonist at postsynaptic receptors in high doses. Interaction experiments with neuroleptics indicated that only (-)-3-PPP significantly increased the antistereotypic effect of neuroleptics in rats. Therefore, the proposed DA autoreceptor stimulation is possibly unrelated to the neuroleptic potentiation.
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Arnt, J., Bøgesø, K.P., Christensen, A.V. et al. Dopamine receptor agonistic and antagonistic effects of 3-PPP enantiomers. Psychopharmacology 81, 199–207 (1983). https://doi.org/10.1007/BF00427262
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DOI: https://doi.org/10.1007/BF00427262