Electrochemical study of hydrogen peroxide formation in isolated mitochondria

Raluca Marcu, Stefania Rapino, Mirella Trinei, Giovanni Valenti, Massimo Marcaccio, Pier Giuseppe Pelicci, Francesco Paolucci, Marco Giorgio

Research output: Contribution to journalArticlepeer-review

Abstract

Mitochondrial respiration generates reactive oxygen species that are involved in physiological and pathological processes. The majority of methods, with exception of electron paramagnetic resonance, used to evaluate the identity, the rate and the conditions of the reactive oxygen species produced by mitochondria, are mainly based on oxidation sensitive markers. Following latest electrochemical methodology, we implemented a novel electrochemical assay for the investigation of aerobic metabolism in preparations of isolated mitochondria through simultaneous measurement of O 2 consumption and reactive species production. This electrochemical assay reveals active H 2O 2 production by respiring mouse liver mitochondria, and shows that ATP synthase activation and moderate depolarization increase the rate of H 2O 2 formation, suggesting that ATP synthesizing (state 3) mitochondria might contribute to oxidative stress or signaling.

Original languageEnglish
Pages (from-to)21-28
Number of pages8
JournalBioelectrochemistry
Volume85
DOIs
Publication statusPublished - Jun 2012

Keywords

  • Amperometry
  • Hydrogen peroxide
  • Mitochondria
  • Platinized carbon fiber microelectrodes

ASJC Scopus subject areas

  • Biophysics
  • Electrochemistry
  • Physical and Theoretical Chemistry

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