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Molecular and Cellular Biochemistry

, Volume 301, Issue 1–2, pp 61–68 | Cite as

Antioxidant enzyme inhibitors enhance peroxynitrite-induced cell death in U937 cells

  • Eun Sun Yang
  • Jeen-Woo Park
Original Paper

Abstract

Peroxynitrite, a potent physiological inorganic toxin, is known to play a critical role in cellular oxidative damage. The protective role of antioxidant enzymes against peroxynitrite-induced oxidative damage in U937 cells was investigated in control and cells pre-treated with diethyldithiocarbamic acid, aminotriazole, and oxlalomalate, specific inhibitors of superoxide dismutase, catalase, and NADP+-dependent isocitrate dehydrogenase, respectively. Upon exposure to 1 mM 3-morpholinosydnomine N-ethylcarbamide (SIN-1), a generator of peroxynitrite through the reaction between nitric oxide and superoxide anion, to U937 cells, the viability was lower and the protein oxidation, lipid peroxidation and oxidative DNA damage reflected by an increase in 8-hydroxy-2′-deoxyguanosine, were higher in the inhibitor-treated cells as compared to the control cells. We also observed the significant increase in the endogenous production of reactive oxygen species, as measured by the oxidation of 2′7′-dichlorodihydrofluorescin as well as the significant decrease in the intracellular GSH level in the inhibitor-treated U937 cells upon exposure to SIN-1. These results suggest that antioxidant enzymes play an important role in cellular defense against peroxynitrite-induced cell death.

Keywords

Peroxynitrite Antioxidant enzymes Cell death Redox status 

Notes

Acknowledgment

This work was supported by grants from the Korea Science and Engineering Foundation (R05-2003-000-10027-0 and R01-2004-000-10328-0).

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Biochemistry, College of Natural SciencesKyungpook National UniversityTaeguKorea

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