Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile

John Whysner, Robert E. Steward, Di Chen, Carson C. Conaway, Lynne K. Verna, John P. Richie, Nusrat Ali, Gary M. Williams

Research output: Contribution to journalArticle

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Abstract

Acrylonitrile (ACN) produces tumors in rats, particularly gliomas of the brain, but tests for genotoxicity have yielded mixed results and no ACN-DNA adducts have been identified in the brain. To examine the possibility that ACN-related brain tumors were not a consequence of binding of ACN to brain DNA, experiments were conducted to investigate possible epigenetic mechanisms. Male Sprague-Dawley rats were exposed to 0, 3, 30, and 300 ppm ACN in drinking water for 21 days, a range that includes doses associated with brain tumorigenesis. In the 30 and 300 ppm ACN groups, 8- oxodeoxyguanosine (8-oxodG) levels were two fold greater than in the controls. Measures of glutathione levels, glutathione peroxidase and catalase were not significantly changed, but cyst(e)ine was somewhat increased. No changes were found in brain cytochrome oxidase activity, which indicates a lack of metabolic hypoxia. Also, no effects on thiobarbituric acid reactive substances were found, indicating a lack of lipid peroxidation. In an additional experiment, male Sprague-Dawley rats were exposed to 0 or 100 ppm ACN in drinking water for 94 days; interim sacrifices were conducted at 3, 10, and 31 days. Levels of brain nuclear DNA 8-oxodG were significantly increased in ACN-exposed rats compared with controls. Another group of animals were given weekly i.v. injections of 5 mg/kg methylnitrosurea and no increases in 8-oxodG were found. These studies suggest the possibility that ACN-induced tumors may be produced by a mode of action involving 8-oxodG. The formation of 8-oxodG is not understood, but does not appear to involve lipid peroxidation or disruption of antioxidant defenses.

Original languageEnglish (US)
Pages (from-to)429-438
Number of pages10
JournalArchives of Toxicology
Volume72
Issue number7
DOIs
StatePublished - Jul 20 1998

Fingerprint

Acrylonitrile
Rats
Brain
DNA
Tumors
Drinking Water
Lipid Peroxidation
Sprague Dawley Rats
Mutagenicity Tests
Lipids
Thiobarbituric Acid Reactive Substances
DNA Adducts
Electron Transport Complex IV
Glutathione Peroxidase
Epigenomics
Brain Neoplasms
Glioma
Catalase
Glutathione
Cysts

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Health, Toxicology and Mutagenesis

Cite this

Whysner, J., Steward, R. E., Chen, D., Conaway, C. C., Verna, L. K., Richie, J. P., ... Williams, G. M. (1998). Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile. Archives of Toxicology, 72(7), 429-438. https://doi.org/10.1007/s002040050523
Whysner, John ; Steward, Robert E. ; Chen, Di ; Conaway, Carson C. ; Verna, Lynne K. ; Richie, John P. ; Ali, Nusrat ; Williams, Gary M. / Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile. In: Archives of Toxicology. 1998 ; Vol. 72, No. 7. pp. 429-438.
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Whysner, J, Steward, RE, Chen, D, Conaway, CC, Verna, LK, Richie, JP, Ali, N & Williams, GM 1998, 'Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile', Archives of Toxicology, vol. 72, no. 7, pp. 429-438. https://doi.org/10.1007/s002040050523

Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile. / Whysner, John; Steward, Robert E.; Chen, Di; Conaway, Carson C.; Verna, Lynne K.; Richie, John P.; Ali, Nusrat; Williams, Gary M.

In: Archives of Toxicology, Vol. 72, No. 7, 20.07.1998, p. 429-438.

Research output: Contribution to journalArticle

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T1 - Formation of 8-oxodeoxyguanosine in brain DNA of rats exposed to acrylonitrile

AU - Whysner, John

AU - Steward, Robert E.

AU - Chen, Di

AU - Conaway, Carson C.

AU - Verna, Lynne K.

AU - Richie, John P.

AU - Ali, Nusrat

AU - Williams, Gary M.

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N2 - Acrylonitrile (ACN) produces tumors in rats, particularly gliomas of the brain, but tests for genotoxicity have yielded mixed results and no ACN-DNA adducts have been identified in the brain. To examine the possibility that ACN-related brain tumors were not a consequence of binding of ACN to brain DNA, experiments were conducted to investigate possible epigenetic mechanisms. Male Sprague-Dawley rats were exposed to 0, 3, 30, and 300 ppm ACN in drinking water for 21 days, a range that includes doses associated with brain tumorigenesis. In the 30 and 300 ppm ACN groups, 8- oxodeoxyguanosine (8-oxodG) levels were two fold greater than in the controls. Measures of glutathione levels, glutathione peroxidase and catalase were not significantly changed, but cyst(e)ine was somewhat increased. No changes were found in brain cytochrome oxidase activity, which indicates a lack of metabolic hypoxia. Also, no effects on thiobarbituric acid reactive substances were found, indicating a lack of lipid peroxidation. In an additional experiment, male Sprague-Dawley rats were exposed to 0 or 100 ppm ACN in drinking water for 94 days; interim sacrifices were conducted at 3, 10, and 31 days. Levels of brain nuclear DNA 8-oxodG were significantly increased in ACN-exposed rats compared with controls. Another group of animals were given weekly i.v. injections of 5 mg/kg methylnitrosurea and no increases in 8-oxodG were found. These studies suggest the possibility that ACN-induced tumors may be produced by a mode of action involving 8-oxodG. The formation of 8-oxodG is not understood, but does not appear to involve lipid peroxidation or disruption of antioxidant defenses.

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