Carcinogen-induced, free radical-mediated reduction in microsomal membrane fluidity: Reversal by indole-3-propionic acid

Małgorzata Karbownik, Joaquin J. Garcia, Andrzej Lewiński, Russel J. Reiter

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Chromium (Cr) is a well established carcinogen, with Cr(III) accounting for much of the intracellular oxidative damage that this transition metal induces. Indole-3-propionic acid (IPA), a melatonin-related molecule, is a reported antioxidant and free radical scavenger. Concentration (1, 10, 100, 500, or 1000 μM) and time (15, 30, 45, 60, or 90 min)-dependent effects of Cr(III) in the presence of H2O2 (0.5 mM), as well as the protective effect of IPA on Cr(III)-induced alterations in membrane fluidity (the inverse of membrane rigidity), as an index of membrane damage, were estimated by fluorescence spectroscopy. Cr(III), in a concentration- and a time-dependent manner, decreased membrane fluidity, with marked effects at a concentration of 500 μM and 60 min of incubation. IPA (5, 3, or 1 mM) prevented the Cr(III)-induced decrease in membrane fluidity. It is concluded that the carcinogen Cr(III), in the presence of H2O2, generates free radicals, which decrease membrane fluidity in rat microsomal membranes. Membrane alterations are pharmacologically prevented by the antioxidant IPA.

Original languageEnglish (US)
Pages (from-to)73-78
Number of pages6
JournalJournal of Bioenergetics and Biomembranes
Volume33
Issue number1
DOIs
StatePublished - Apr 24 2001

Keywords

  • Carcinogen
  • Chromium
  • Indole-3-propionic acid
  • Membrane fluidity
  • Microsomes
  • Oxidative damage

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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