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Myung Hee Chung 2 Articles
Effects of Hyperoxia on 8-Hydroxydeoxyguanosine Formation in Carbon Monoxide Exposed Rats.
Heon Kim, Soo Hun Cho, Myung Hee Chung
Korean J Prev Med. 1994;27(1):84-106.
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AbstractAbstract PDF
Hyperbaric oxygen(HBO) therapy for carbon monoxide(CO) poisoning eventually inducing the hypoxia-reoxygenation condition, may produce oxygen free radicals, which forms 8-hydroxydeoxyguanosine(8-OH-dG) by attacking C-8 position of deoxy-guanosine (dG) in DNA. Effects of oxygen partial pressure or duration of HBO therapy with or without CO poisoning on the tissue 8-OH-dG formation were investigated. Male Sprague-Dawley rats were grouped and exposed to air(control group), 4000ppm of CO for 10 to 30 minutes(CO only group), air for 30 minutes after 30 minute exposure to 4000ppm of CO(CO-air exposure group), HBO after 30 minute exposure to 4000ppm of CO(CO-HBO group), or HBO therapy for 10-120 minutes (HBO only group). The 8-OH-dG concentrations in the brain and the lung tissues were measured with high performance liquid chromatography and electrochemical detector (ECD). Average concentrations of the 8-OH-dG of each group were statistically compared. In the brain tissues, 8-OH-dG concentrations of the CO only group, the CO-air exposure group, and the CO-HBO group did not significantly differ from those of the control group. Similar insignificance was also found between the CO-HBO group and the HBO only groups. No appreciable dose-response relationship was observed between the 8-OH-dG concentration and the oxygen partial pressure or the duration of HBO. However, the 8-OH-dG concentrations of the 30 minute CO only group were higher than those of the CO-air exposure group (p-value<0.05). In the lung tissues, there were no significant differences between the 8-OH-dG concentrations of the control group and those of the CO only group, the CO-air exposure group, and the CO-HBO group. However, mean 8-OH-dG concentration of the CO-air exposure group was significantly higher than that of the CO only group under the same CO exposure condition(p-value<0.05). With the duration of CO exposure, the 8-OH-dG concentrations of the lung tissues decreased significantly (p-value<0.05). The concentrations of 8-OH-dG in the lung tissues proportionally increased with the duration of HBO, but no such relation was observed with the oxygen partial pressure. These results suggest that the brain may be more resistant to oxygen free radicals as compared with the lungs, and that oxygen toxicity following HBO may be affected by factors other than oxygen free radicals.
Summary
Lipid Peroxidation in Vivo Monitored as Ethane Exhalation in Hyperoxia.
Jae Cheol Song, Soo Hun Cho, Myung Hee Chung, Dork Ro Yun
Korean J Prev Med. 1987;20(2):221-227.
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AbstractAbstract PDF
In vivo ethane production in rats was used as an index of oxygen toxicity. The rats were allocated to four exposure conditions; hyperbaric oxygenation (HBO=5 ATA, 100% O2), normobaric oxygenation (NBO=1 ATA, 100% O2), hyperbaric aeration (HBA=5 ATA, 21% O2) and normobaric aeration (NBA=1 ATA, 21% O2). After 120 minutes of exposure, the rats exposed to high concentration and/or high pressure oxygen exhaled significantly larger amounts of ethane than those exposed to NBA, and the differences in ethane production between any two groups were statistically significant (p<0.01). This finding supports the hypothesis that hypothesis that hyperoxia increase oxygen free-radicals and the radicals produce ethane as a result of lipid peroxidation. It is notable that the ethane exhalation level of the HBA group was significantly higher than that of the NBO group. This difference could not be accounted for by the alveolar oxygen partial pressure difference between the two groups.
Summary

JPMPH : Journal of Preventive Medicine and Public Health