Comparative study of taurine and tauropyrone: GABA receptor binding, mitochondrial processes and behaviour

Zane Dzirkale, Jolanta Pupure, Juris Rumaks, Simons Svirskis, Marija Vanina, Rudolfs Mezhapuke, Velga Sile, Maria Augusta Fernandes, Gunars Duburs, Vija Klusa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Objectives Taurine, a sulfur-containing amino acid, has high hydrophilicity and is poorly absorbed. Tauropyrone, a taurine-containing 1,4-dihydropyridine derivative, is suggested to have greater activity than taurine owing to improved physicochemical properties that facilitate delivery of the compound to target cells. The aim of this study was to determine whether the 1,4-dihydropyridine moiety in tauropyrone improves the pharmacological efficacy of taurine in vitro and in vivo. Methods The effects of taurine and tauropyrone, as well as of the 1,4-dihydropyridine moiety were compared in in-vitro experiments to determine the binding to GABA receptors and influence on mitochondrial processes (isolated rat liver mitochondria), and in in-vivo tests to assess the influence on behavioural effects caused by the GABA-A receptor ligands, bicuculline, diazepam and ethanol. Key findings Unlike taurine, tauropyrone did not display binding activity for the GABA-A receptor, and only taurine (but not tauropyrone) at low doses (0.1, 1.0 and 10 mg/kg) antagonised the bicuculline-induced convulsion effect. Taurine and tauropyrone had no effect on diazepam myorelaxing action, and they both exerted a comparable 'anti-ethanol' effect (shortening of the ethanol-sleeping time). Taurine and tauropyrone did not influence processes of mitochondrial bioenergetics. Conclusions The action of tauropyrone at the level of the GABA-A receptor differs qualitatively from that of taurine, probably because of its 1,4-dihydropyridine moiety, which may hinder access to the GABA-A receptor GABA site. Tauropyrone does not show improved pharmacological efficacy in in-vitro and in-vivo studies in comparison with taurine.

Original languageEnglish
Pages (from-to)230-237
Number of pages8
JournalJournal of Pharmacy and Pharmacology
Volume63
Issue number2
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

Keywords*

  • 1,4-dihydropyridine
  • GABA receptor ligands
  • mitochondrial processes
  • taurine
  • tauropyrone

Field of Science*

  • 3.1 Basic medicine

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

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