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

• Autorzy: Jarmuszkiewicz W. , Antos-Krzeminska N. , Drachal-Chrul D. , Matkovic K. , Nobik W. , Pienkowska J. , Swida A. , Woyda-Ploszczyca A. , Budzinska M.
• Języki publikacji: EN

Abstrakty

EN

The purpose of this study was establishing the basic energetic parameters of amoeba Acanthamoeba castellaniimitochondria 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 crelease for 0.5–25 mM H2O2-treated versuscontrol (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.

Słowa kluczowe

PL

Acanthamoeba castellanii; hydrogen peroxide; oxidative stress; energetic parameter; mitochondrion; resistance; amoeba

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 2008
• Tom: 55
• Numer: 2
• Opis fizyczny: p.349-355,ref.

Twórcy

autor

Jarmuszkiewicz W.

• Adam Mickiewicz University, Umultowska 89, 61-614 Poznan, Poland

autor

Antos-Krzeminska N.

autor

Drachal-Chrul D.

autor

Matkovic K.

autor

Nobik W.

autor

Pienkowska J.

autor

Swida A.

autor

Woyda-Ploszczyca A.

autor

Budzinska M.

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