Neurochemical and neuroprotective effects of some aliphatic propargylamines: New selective nonamphetamine-like monoamine oxidase B inhibitors

P. H. Yu, B. A. Davis, D. A. Durden, A. Barber, I. Terleckyj, W. G. Nicklas, A. A. Boulton

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

Aliphatic N-propargylamines have recently been discovered to be highly potent, selective, and irreversible monoamine oxidase B (MAO-B) inhibitors. N-Methyl-N-(2-pentyl)propargylamine (M-2-PP) and N-methyl-N-(2- hexyl)propargylamine (2-HxMP), for example, are approximately fivefold more potent than l-deprenyl at inhibiting mouse brain MAO-B activity following oral administration. These inhibitors are nonaromatic compounds and are chemically quite different from other known MAO-B inhibitors. Some of their neurochemical and neuroprotective properties have been evaluated and compared with those of l-deprenyl. We have confirmed that these new inhibitors selectively inhibit MAO-B activity both in vitro and in vivo. 2- Phenylethylamine levels were substantially increased following administration of M-2-PP, but the levels of dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid, 5-hydroxytryptamine, and 5-hydroxyindoleacetic acid were not affected except at high, nonselective doses. Chronic oral administration of l-deprenyl and M-2-PP causes selective inhibition of MAO-B activity and increases dopamine levels in mouse caudate. M-2-PP, like l-deprenyl, has been shown to be potent in protecting against MPTP-induced damage in the mouse. N- (2-Chloroethyl)-N-ethyl-2-bromobenzylamine (DSP-4), a noradrenaline neurotoxin, is not an MAO substrate. Its noradrenaline-depleting effects were substantially mitigated by l-deprenyl as well as by M-2-PP and 2-HxMP in the mouse hippocampus. Administration of 2-phenylethylamine, however, failed to reverse the effect of DSP-4. The neuroprotective effect of M-2-PP and 2-HxMP is apparently unrelated to the uptake of DSP-4.

Original languageEnglish (US)
Pages (from-to)697-704
Number of pages8
JournalJournal of neurochemistry
Volume62
Issue number2
DOIs
StatePublished - Feb 1994

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Cellular and Molecular Neuroscience

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