Japan Radioisotope Association Acta Medica Okayama 0033-8303 61 5 2012 Inhibitory Effects of Pre and Post Radon Inhalation on Carbon Tetrachloride-induced Oxidative Damage in Mouse Organs 231 241 EN Yuichi Nishiyama Takahiro Kataoka Junichi Teraoka Akihiro Sakoda Yuu Ishimori Kiyonori Yamaoka Radon inhalation activates antioxidative functions in some organs of mice. We examined the prevention effects of pre radon inhalation and the alleviation effects of post radon inhalation on carbon tetrachloride (CCl₄)-induced oxidative damage in the brain, heart, lung, liver, and kidney of mice. In addition, we compared the effect of pre and post radon inhalation on oxidative damage. Mice inhaled radon at a concentration of 18000Bq/m³ for 6hrs before or after CCl₄ administration. As a result, the total glutathione(t-GSH) contents and catalase(CAT) activities in the brain, heart, lung, liver, and kidney and superoxide dismutase(SOD) activities in the heart and lung were significantly higher in pre and post radon-inhaled mice than in mice treated with only CCl₄. Pre radon inhalation inhibited and post radon inhalation reduced lipid peroxidation induced by CCl₄. In addition, there were no significant differences in lipid peroxide(LPO) levels in the brain, heart, lung, liver, and kidney between pre and post radon-inhaled mice. These findings suggested that post radon inhalation has the same effects as pre radon inhalation against CCl₄-induced oxidative damage in the brain, heart, lung, liver, and kidney. No potential conflict of interest relevant to this article was reported.