Antioxidant properties of PF9601N, a novel MAO-B inhibitor: Assessment of its ability to interact with reactive nitrogen species

Lydia Bellik, Stefania Dragoni, Federica Pessina, Elisenda Sanz, Mercedes Unzeta, Massimo Valoti

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

The novel MAO-B inhibitor PF9601N, its cytochrome P450-dependent metabolite FA72 and l-deprenyl were studied as potential peroxynitrite (ONOO-) scavengers and nitric oxide synthase (NOS) inhibitors. The scavenging activity of these compounds was evaluated by measuring the oxygen consumption through peroxynitrite-mediated oxidation of both linoleic acid and brain homogenate. FA72, PF9601N and l-deprenyl caused a concentration-dependent inhibition of ONOO--induced linoleic acid oxidation with an IC50 value of 60.2 μM, 82.8 μM and 235.8 μM, respectively. FA72 was the most potent also in inhibiting ONOO--induced brain homogenate oxidation with an IC50 value of 99.4 μM, while PF9601N and l-deprenyl resulted weaker inhibitors in the same experimental model, showing an IC50 value of 164.8 and 112.0 μM, respectively. Furthermore, both the novel MAO-B inhibitor as well as its metabolite were able to strongly inhibit rat brain neuronal NOS (IC50 of 183 μM and 192 μM, respectively), while l-deprenyl at the highest concentration used (3 mM), caused only a slight decrease of the enzyme activity. Moreover, inducible NOS was strongly inhibited by FA72 only. All these results suggest that PF9601N could be a promising therapeutic agent in neurodegenerative disorders such as Parkinson's disease.
Original languageEnglish
Pages (from-to)235-239
JournalActa Biochimica Polonica
Volume57
Issue number2
Publication statusPublished - 17 Sep 2010

Keywords

  • l-deprenyl
  • MAO-B inhibitors
  • Nitric oxide
  • Parkinson's disease
  • Peroxynitrite

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