Summary
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1.
The effects of chronic administration (28 days s.c. via Alzet osmotic minipumps) of 2-phenylethylamine·HC1 (10 mg kg−1 per day) and/or ( − )-deprenyl⋅HC1 (1 mg kg−1 per day) on dopamine and noradrenaline receptor subtypes have been measured in rat brain.3H-CGP 12177 was used to labelβ-adrenoceptors;3H-spiperone and3H-SCH 23390 were used to label D2-like and D1-like receptors.
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2.
Total corticalβ-adrenoceptor density was reduced by ( − )-deprenyl but not 2-phenylethylamine alone. Combined administration of 2-phenylethylamine and ( − )-deprenyl resulted in a significantly larger decrease than ( − )-deprenyl alone. Subtype density analysis by competition experiments with ICI 89406 revealed that the ( − )-deprenyl effect in cortex was due to a decrease inβ 1-adrenoceptor density. The combination of 2-phenylethylamine and ( − )-deprenyl resulted in a significant decrease in both corticalβ 1- and corticalβ 2-adrenoceptors. Cerebellarβ-adrenoceptor density was not altered by the present drug treatments. TheK d values for totalβ-adrenoceptor densities andK i values forβ-adrenoceptor subtype densities were not altered by drug treatment in either cortex or cerebellum.
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3.
Administration of 2-phenylethylamine and of ( − )-deprenyl resulted in a decrease in the density of D1-like3H-SCH 23390 but not D2-like3H-spiperone binding to dopamine receptors in the striatum. The effects of combined 2-phenylethylamine and ( − )-deprenyl treatment on3H-SCH 23390 binding were additive. These drug treatments did not alterK d values for these binding sites.
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4.
The down-regulation of catecholamine receptors following chronically increased availability of 2-phenylethylamine may be due to the catecholamine releasing or uptake blocking effects of this amine. These effects may also be attributable to a direct neuromodulatory action of 2-phenylethylamine on catecholamine receptors.
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The parallels between effects of increased 2-phenylethylamine availability and effects of administration of MAO inhibitor antidepressants on catecholamine receptor systems indicate that this substrate for MAO may mediate some of the effects of MAO inhibitor antidepressants.
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Paetsch, P.R., Greenshaw, A.J. Down-regulation ofβ-adrenergic and dopaminergic receptors induced by 2-phenylethylamine. Cell Mol Neurobiol 13, 203–215 (1993). https://doi.org/10.1007/BF00733750
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DOI: https://doi.org/10.1007/BF00733750