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Generation of furazolidone radical anion and its inhibition by glutathione
1Department of Pediatrics, University of Arizona, Tucson 85724.
Abstract:
Furazolidone is a nitrofuran drug which causes dilated cardiomyopathy in turkeys and serves as an important model of human dilated cardiomyopathy. Although extensively investigated, the chemical mechanism by which furazolidone produces injury remains unknown. In this work we used electron paramagnetic resonance (EPR) spectroscopy to show that furazolidone was reduced to its corresponding nitro anion radical by ascorbate and hypoxanthine. Glutathione prevented the generation of this anion radical. These results document directly, with EPR spectroscopy, the presence of furazolidone anion radical during biochemical reduction and suggest a protective role of glutathione in furazolidone-induced injury. These data enhance our understanding of furazolidone metabolism and may be useful in defining its role in furazolidone-induced dilated cardiomyopathy.
Insights
Furazolidone causes heart damage in turkeys, a model for human heart disease. Electron paramagnetic resonance (EPR) spectroscopy revealed furazolidone anion radical formation during reduction, with glutathione preventing this injury.
Area of Science:
- Biochemistry
- Toxicology
- Cardiovascular Research
Background:
- Furazolidone, a nitrofuran drug, induces dilated cardiomyopathy in turkeys, serving as a critical model for human cardiovascular disease.
- The precise chemical mechanism underlying furazolidone-induced cardiac injury remains incompletely understood.
- Understanding furazolidone's metabolism is crucial for mitigating its cardiotoxic effects.
Purpose of the Study:
- To elucidate the chemical mechanism of furazolidone-induced cardiac injury.
- To directly detect reactive intermediates during furazolidone metabolism using electron paramagnetic resonance (EPR) spectroscopy.
- To investigate the potential protective role of glutathione against furazolidone toxicity.
Main Methods:
- Electron paramagnetic resonance (EPR) spectroscopy was employed to monitor the reduction of furazolidone.
- Biochemical reduction of furazolidone was achieved using ascorbate and hypoxanthine.
- The effect of glutathione on the generation of furazolidone radicals was assessed.
Main Results:
- EPR spectroscopy directly demonstrated the reduction of furazolidone to its corresponding nitro anion radical.
- Ascorbate and hypoxanthine were identified as agents capable of generating the furazolidone anion radical.
- Glutathione effectively inhibited the formation of the furazolidone anion radical.
Conclusions:
- The study provides direct spectroscopic evidence for the generation of the furazolidone anion radical during biochemical reduction.
- These findings suggest that the furazolidone anion radical is a key mediator of furazolidone-induced cardiac injury.
- Glutathione exhibits a protective role by preventing the formation of this toxic radical, offering potential therapeutic insights.