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1 Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, and 2 Fourth Department of Internal Medicine, Fukuoka University, Fukuoka, Japan
CORRESPONDENCE: K. Kuwano, Research Institute for Diseases of the Chest, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. Fax: 81 926425389. E-mail: kkuwano@kokyu.med.kyushu-u.ac.jp
Keywords: Human homologue of the MutT protein, 8-hydroxy-deoxyguanosine, idiopathic interstitial pneumonias, mitochondria, reactive oxygen species
Received: July 12, 2002
Accepted September 17, 2002
This work was supported by a Grant-in-Aid for Scientific Research (13670604) from the Ministry of Education, Science and Culture of Japan.
Lung epithelial cells are a primary target for reactive oxygen species (ROS). ROS can cause oxidative deoxyribonucleic acid modification, such as 8-hydroxy-deoxyguanosine (8-OHdG). A human homologue of the MutT protein (hMTH1) prevents this modification. Mitochondria are the most important cellular source of ROS and may be susceptible to oxidative damage. The purpose of this study is to investigate oxidative stress and mitochondrial damage in lung epithelial cells from idiopathic interstitial pneumonias (IIPs).
The authors analysed 8-OHdG, hMTH1, and mitochondrial proteins on lung specimens from 13 patients with IIPs consisted of eight patients with usual interstitial pneumonia and five patients with nonspecific interstitial pneumonia using Western blot analysis and immunohistochemistry.
Immunoreactivity for 8-OHdG and hMTH1 was significantly increased in the lung epithelial cells from patients with IIPs compared with controls. The expression of hMTH1 was localised in the nuclear and cytoplasmic, but not the mitochondrial, fraction of lung homogenates. Immunoreactivity for mitochondrial protein and cytochrome c oxidase complex subunit IV was increased in the lung epithelial cells from patients with IIPs compared with controls.
The current study concludes that oxidative stress may participate in epithelial cell damage in idiopathic interstitial pneumonia, and that increased mitochondrial mass may associate with increased reactive oxygen species production in idiopathic interstitial pneumonia.
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