Oral administration of trans-resveratrol to guinea pigs increases cardiac DT-diaphorase and catalase activities, and protects isolated atria from menadione toxicity

Maura Floreani, Eleonora Napoli, Luigi Quintieri, Pietro Palatini

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Resveratrol (3,4′,5-trihydroxy-trans-stilbene) is a natural phytoalexin found in grapes and wine. It has antioxidant and antiproliferative activities, and has been shown to induce NAD(P)H:quinone oxidoreductase, also known as DT-diaphorase, in cultured mouse hepatoma cells. DT-diaphorase is a detoxifying enzyme for quinone-containing substances, due to its ability to prevent their one-electron reduction and the consequent generation of reactive oxygen species (ROS). The aim of the present study was to investigate whether oral administration of trans-resveratrol to guinea pigs (60 mg/l in tap water for 16 days, ad libitum) increases cardiac DT-diaphorase and, consequently, reduces the response of isolated atria to 2-methyl-1,4-naphthoquinone (menadione), the positive inotropic effect of which is related to the amount of ROS generated by its cardiac metabolism. In the cardiac tissue of resveratrol-treated animals, DT-diaphorase activity was significantly higher than that measured in control animals, the Vmax of the enzyme reaction being 75.47 ± 3.87 and 50.73 ± 0.63 nmoles/mg protein/min, respectively (p < 0.05). Resveratrol administration also significantly increased the activity of cardiac catalase (32.20 ± 2.39 vs. 25.14 ± 3.85 units/mg protein in treated and control animals, respectively; p < 0.001). As a consequence, menadione metabolism by the cardiac homogenate obtained from resveratrol-treated animals generated a smaller amount of ROS and, in electrically driven left atria, menadione produced a significantly lower increase in the force of contraction than in atria isolated from control animals. These results indicate that oral administration of resveratrol exerts cardioprotection against ROS-mediated menadione toxicity.

Original languageEnglish (US)
Pages (from-to)2741-2750
Number of pages10
JournalLife Sciences
Volume72
Issue number24
DOIs
StatePublished - May 2 2003
Externally publishedYes

Keywords

  • Cardiotoxicity
  • Catalase
  • DT-diaphorase
  • Guinea pigs
  • Menadione
  • Resveratrol

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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