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Phenylethylaminergic modulation of catecholaminergic neurotransmission
1Neuropsychiatric Research Unit, University of Saskatchewan Saskatoon, Canada.
Progress in Neuro-Psychopharmacology & Biological Psychiatry
|January 1, 1991
Summary
Phenylethylamine (PE) is a trace amine in the brain that modulates catecholaminergic neurotransmission. Its levels are affected by various factors and it may play a role in neuropsychiatric conditions.
Area of Science:
- Neuroscience
- Neurochemistry
- Pharmacology
Background:
- Phenylethylamine (PE) is a trace amine found in the brain.
- PE is synthesized from phenylalanine and rapidly metabolized by monoamine oxidase B (MAO-B).
Purpose of the Study:
- To investigate the distribution, synthesis, metabolism, and functional role of PE in the brain.
- To explore PE's potential involvement in neurotransmission and neuropsychiatric disorders.
Main Methods:
- Investigated PE distribution in synaptosomes.
- Examined PE synthesis via L-AADC and degradation by MAO-B.
- Assessed PE concentration changes under various conditions (MAO inhibition, substantia nigra lesion, amine depletion, antipsychotic drugs).
- Studied PE's effects on dopamine (DA) and norepinephrine (NA) neurotransmission via iontophoresis.
Main Results:
- PE is heterogeneously distributed in the brain, particularly in synaptosomes.
- MAO inhibition, substantia nigra lesions, amine depletion, and antipsychotic drugs significantly alter PE levels.
- Iontophoresed PE potentiates the effects of DA and NA agonists but not other neurotransmitters.
Conclusions:
- PE likely acts as a postsynaptic neuromodulator of catecholaminergic neurotransmission.
- PE may be involved in the mechanism of action of Deprenyl.
- PE or its metabolite phenylacetic acid (PAA) could be implicated in the etiology of schizophrenia, depression, and aggression.