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2008 | 55 | 2 | 349-356
Article title

Basic energetic parameters of Acanthamoeba castellanii mitochondria and their resistance to oxidative stress

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The purpose of this study was establishing the basic energetic parameters of amoeba Acanthamoeba castellanii mitochondria respiring with malate and their response to oxidative stress caused by hydrogen peroxide in the presence of Fe2+ ions. It appeared that, contrary to a previous report (Trocha LK, Stobienia O (2007) Acta Biochim Polon 54: 797), H2O2-treated mitochondria of A. castellanii did not display any substantial impairment. No marked changes in cytochrome pathway activity were found, as in the presence of an inhibitor of alternative oxidase no effects were observed on the rates of uncoupled and phosphorylating respiration and on coupling parameters. Only in the absence of the alternative oxidase inhibitor, non-phosphorylating respiration progressively decreased with increasing concentration of H2O2, while the coupling parameters (respiratory control ratio and ADP/O ratio) slightly improved, which may indicate some inactivation of the alternative oxidase. Moreover, our results show no change in membrane potential, Ca2+ uptake and accumulation ability, mitochondrial outer membrane integrity and cytochrome c release for 0.5-25 mM H2O2-treated versus control (H2O2-untreated) mitochondria. These results indicate that short (5 min) incubation of A. castellanii mitochondria with H2O2 in the presence of Fe2+ does not damage their basic energetics.
Physical description
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
  • Faculty of Biology, Adam Mickiewicz University, Poznań, Poland
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