Antioxidant defense systems of two lipidopteran insect cell lines.
Spodoptera frugiperda Sf-9 (Sf-9) and Trichoplusia ni BTI-Tn-5B1-4 (Tn-5B1-4) insect cell lines were found to contain unique assemblages of antioxidant enzymes. Specifically, the Sf-9 insect cell line contained Manganese and Copper-Zinc superoxide dismutase (MnSOD and CuZnSOD) for reducing the superoxide radical (O(2)(*-)) to hydrogen peroxide (H(2)O(2)) and ascorbate peroxidase (APOX) for reducing the resulting H(2)O(2) to H(2)O. Approximately one third of the total SOD activity was found to be MnSOD. The Tn-5B1-4 cells were also found to contain MnSOD (approximately two thirds of the total SOD activity), CuZnSOD and APOX activities. However, the Tn-5B1-4 cell line, in contrast to the Sf-9 cell line, contained catalase (CAT) activity for reducing H(2)O(2) to H(2)O. Both the Sf-9 and Tn-5B1-4 cell lines contained glutathione reductase and dehydroascorbic acid reductase activities for regenerating the reduced forms of glutathione and ascorbic acid, respectively. In addition, both cell lines contained glutathione S-transferase peroxidase activity towards hydroperoxides other than H(2)O(2). Finally, neither cell line contains the glutathione peroxidase activity that is ubiquitous in mammalian cells.
Wang
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Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, IA 52242-1219, USA.
Oberley
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Murhammer
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D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D002374:Catalase / Q000378:metabolism; D002455:Cell Division; D002460:Cell Line; D005609:Free Radicals / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase; D007915:Lepidoptera / Q000166:cytology / Q000378:metabolism*; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D010088:Oxidoreductases / Q000378:metabolism*; D010544:Peroxidases / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D018411:Spodoptera / Q000166:cytology / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism
D000975:Antioxidants; D005609:Free Radicals; D017382:Reactive Oxygen Species; D013481:Superoxides; D010088:Oxidoreductases; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; C020666:glutathione dehydrogenase (ascorbate); D005982:Glutathione Transferase; D005978:Glutathione