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  • Title: 3-Methoxytyramine as an indicator of impulse-induced dopamine release in rat brain in vivo.
    Author: Kehr W.
    Journal: Naunyn Schmiedebergs Arch Pharmacol; 1976 Jun; 293(3):209-15. PubMed ID: 958511.
    Abstract:
    3-Methoxtyramine 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 alpha-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. gamma-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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