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3-Methoxytyramine as an indicator of impulse-induced dopamine release in rat brain in vivo

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Summary

3-Methoxytyramine and dopamine accumulated in vivo in rat brain after monoamine oxidase inhibition with pargyline HCl. A dose of 100 mg/kg i.p. appeared to inhibit monoamine oxidase completely and led to a linear accumulation of 3-methoxytyramine for the first 90 min. Axotomy of the ascending dopaminergic fiber tract by means of a complete transverse cerebral hemisection almost completely blocked 3-methoxytyramine formation provided that catecholamine synthesis was inhibited with H 44/68 (methylester of α-methyl-p-tyrosine). The dopamine receptor agonist apomorphine, 0.5 mg/kg i.p., decreased, while the dopamine receptor antagonist haloperidol, 2 mg/kg i.p., accelerated 3-methoxytyramine formation. γ-Butyrolactone, 750 mg/kg i.p., not only decreased 3-methoxytyramine formation per se but also effectively antagonized the haloperidol-induced increase in 3-methoxytyramine accumulation. 3-Methoxytyramine formation after inhibition of monoamine oxidase appears to be a reliable indicator of impulse-induced dopamine release and metabolism.

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Authors and Affiliations

  1. Department of Pharmacology, University of Göteborg, Fack, S-400 33, Göteborg, Sweden

    Wolfgang Kehr

  2. Department für Neuropsychopharmakologie, Schering AG, Müllerstrasse 170-178, D-1000, Berlin 65

    Wolfgang Kehr

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Kehr, W. 3-Methoxytyramine as an indicator of impulse-induced dopamine release in rat brain in vivo. Naunyn-Schmiedeberg's Arch. Pharmacol. 293, 209–215 (1976). https://doi.org/10.1007/BF00507343

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  • DOI: https://doi.org/10.1007/BF00507343

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