Reactive oxygen species produced by the mitochondrial respiratory chain are involved in Cd2+-induced injury of rat ascites hepatoma AS-30D cells
| Autor: | Dorota Dymkowska, Lech Wojtczak, Mariusz R. Wieckowski, Elena A. Belyaeva |
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| Rok vydání: | 2006 |
| Předmět: |
Respiratory chain
Biophysics Apoptosis Mitochondria Liver Antimycin A Mitochondrion Biology Mitochondrial Membrane Transport Proteins Biochemistry Antioxidants Electron Transport chemistry.chemical_compound Necrosis Liver Neoplasms Experimental Cyclosporin a Cell Line Tumor Animals chemistry.chemical_classification Membrane Potential Mitochondrial Reactive oxygen species Mitochondrial Permeability Transition Pore Respiratory complex III Cell Biology Permeability transition pore Molecular biology Mitochondria Cell biology Rats Mitochondrial respiratory chain Mitochondrial permeability transition pore chemistry Coenzyme Q – cytochrome c reductase Hepatoma AS-30D Reactive Oxygen Species Cadmium |
| Zdroj: | Biochimica et Biophysica Acta (BBA) - Bioenergetics. 1757(12):1568-1574 |
| ISSN: | 0005-2728 |
| DOI: | 10.1016/j.bbabio.2006.09.006 |
| Popis: | Using AS-30D rat ascites hepatoma cells, we studied the modulating action of various antioxidants, inhibitors of mitochondrial permeability transition pore and inhibitors of the respiratory chain on Cd(2+)-produced cytotoxicity. It was found that Cd(2+) induced both necrosis and apoptosis in a time- and dose-dependent way. This cell injury involved dissipation of the mitochondrial transmembrane potential, respiratory dysfunction and initial increase of the generation of reactive oxygen species (ROS), followed by its decrease after prolonged incubation. Inhibitors of the mitochondrial permeability transition pore, cyclosporin A and bongkrekic acid, and inhibitors of respiratory complex III, stigmatellin and antimycin A, but not inhibitor of complex I, rotenone, partly prevented necrosis evoked by exposure of the cells to Cd(2+). Apoptosis of the cells was partly prevented by free radical scavengers and by preincubation with N-acetylcysteine. Stigmatellin, antimycin A and cyclosporin A also abolished Cd(2+)-induced increase in ROS generation. It is concluded that Cd(2+) toxicity in AS-30D rat ascites hepatoma, manifested by cell necrosis and/or apoptosis, involves ROS generation, most likely at the level of respiratory complex III, and is related to opening of the mitochondrial permeability transition pore. |
| Databáze: | OpenAIRE |
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