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A comparison of the potencies of various dopamine receptor agonists in models for pre- and postsynaptic receptor activity

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Summary

Several dopamine (DA) receptor agonists, notably N,N-dipropyl-2-aminotetralin analogues differing in the number and position of phenolic hydroxyl groups, were evaluated in model systems for pre- and postsynaptic dopaminergic activity. Apomorphine, piribedil and pergolide were included for comparison. All compounds inhibited the γ-butyrolactone (GBL)-induced increase in DA concentrations in the rat striatum and olfactory tubercle, although a dosedependency could not be demonstrated for one of the compounds, i.e. N,N-dipropyl-2-amino-5,6-dihydroxytetralin. In addition to the reversal of the DA-increase all compounds decreased the HVA and DOPAC levels in a dose-dependent manner, in much the same way as in normal, non GBL-pretreated rats.

The potencies of the drugs to decrease HVA in normal rats and to inhibit the DA-increase and to decrease HVA in GBL-pretreated rats, both in the striatum and the olfactory tubercle were compared with each other and with the potencies to induce stereotyped behaviour. It may be concluded that (1) N,N-dipropyl-2-amino-7-hydroxytetralin shows the largest difference in activity in the biochemical and the behavioural models, suggesting a selective presynaptic activity. This was corroborated by the appearance of a marked hypomotility after low doses of this compound; (2) The potencies to decrease striatal HVA concentrations are generally somewhat different from the potencies to inhibit GBL-induced DA-increases, but appear to be comparable to the potencies to inhibit GBL-induced dihydroxyphenylalanine (DOPA)-increases; (3) There is no indication that the DA agonists in general are more potent at presynaptic receptors in the tubercle than in the striatum.

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Feenstra, M.G.P., Sumners, C., Goedemoed, J.H. et al. A comparison of the potencies of various dopamine receptor agonists in models for pre- and postsynaptic receptor activity. Naunyn-Schmiedeberg's Arch. Pharmacol. 324, 108–115 (1983). https://doi.org/10.1007/BF00497015

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  • DOI: https://doi.org/10.1007/BF00497015

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