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. 1996 Mar 5;93(5):1753–1758. doi: 10.1073/pnas.93.5.1753

DNA strand breakage, activation of poly (ADP-ribose) synthetase, and cellular energy depletion are involved in the cytotoxicity of macrophages and smooth muscle cells exposed to peroxynitrite.

C Szabó 1, B Zingarelli 1, M O'Connor 1, A L Salzman 1
PMCID: PMC39853  PMID: 8700830

Abstract

The free radicals nitric oxide and superoxide anion react to form peroxynitrite (ONOO-), a highly toxic oxidant species. In vivo formation of ONOO- has been demonstrated in shock and inflammation. Herein we provide evidence that cytotoxicity in cells exposed to ONOO- is mediated by DNA strand breakage and the subsequent activation of the DNA repair enzyme poly(ADP ribose) synthetase (PARS). Exposure to ONOO- (100 microM to 1 mM) inhibited mitochondrial respiration in cultured J774 macrophages and in rat aortic smooth muscle cells. The loss of cellular respiration was rapid, peaking 1-3 h after ONOO- exposure, and reversible, with recovery after a period of 6-24 h. The inhibition of mitochondrial respiration was paralleled by a dose-dependent increase in DNA strand breakage, reaching its maximum at 20-30 min after exposure to ONOO-. We observed a dose-dependent increase in the activity of PARS in cells exposed to ONOO-. Inhibitors of PARS such as 3-aminobenzamide (1 mM) prevented the inhibition of cellular respiration in cells exposed to ONOO-. Activation of PARS by ONOO--mediated DNA strand breakage resulted in a significant decrease in intracellular energy stores, as reflected by a decline of intracellular NAD+ and ATP content. 3-Aminobenzamide prevented the loss of NAD+ and ATP in cells exposed to ONOO-. In contrast, impairment of cellular respiration by the addition of the nitric oxide donors S-nitroso-N-acetyl-DL-penicillamine or diethyltriamine nitric oxide complex, was not associated with the development of DNA strand breaks, in concentrations up to 1 mM, and was largely refractory to PARS inhibition. Our results suggest that DNA damage and activation of PARS, an energy-consuming futile repair cycle, play a central role in ONOO--mediated cellular injury.

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Selected References

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