Studies on biochemical effects of nitrogen dioxide: I. Lipid peroxidation as measured by ethane exhalation of rats exposed to nitrogen dioxide |
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Authors: | M Sagai T Ichinose H Oda K Kubota |
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Affiliation: | (1) Division of Basic Medical Sciences, The National Institute for Environmental Studies, P.O., 305 Tsukuba, Ibaraki, Japan |
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Abstract: | This research was in order to follow the periodic fluctuation of lipid peroxidation by a new method in rats exposed to nitrogen
dioxide. Wistar male rats were examined for lipid peroxidation as demonstrated by ethane exhalation. In rats continuously
exposed to 10 ppm nitrogen dioxide for 2 weeks, the amount of ethane exhaled fluctuated in a complex manner during the exposure.
Ethane exhalation decreased slightly after the first day of exposure and then increased rapidly. The maximal values were observed
after the fourth day of exposure and then decreased gradually to the initial level. Furthermore, the activity of glutathione
peroxidase in lungs of rats exposed to 10 ppm nitrogen dioxide varied symmetrically against the change of ethane formation.
Similar changes in ethane exhalation were observed in rats exposed to the lower levels of nitrogen dioxide (0.4, 1.2 and 4.0
ppm) for 4 months. Compared to 10 ppm nitrogen dioxide exposure for 14 days, the characteristics in rats exposed to the low
levels (0.4–4.0 ppm) of nitrogen dioxide were: the decline of ethane formation, the delay in alterations, and the tendency
toward gradual increased during the longer period exposure. |
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