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Expression of Peroxiredoxin and Thioredoxin in Human Lung Cancer and Paired Normal Lung  

Kim, Young Sun (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Park, Joo Hun (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Lee, Hye Lim (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Shim, Jin Young (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Choi, Young In (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Oh, Yoon Jung (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Shin, Seung Soo (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Choi, Young Hwa (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Park, Kwang Joo (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Park, Rae Woong (Department of Medical Informatics, Ajou University School of Medicine)
Hwang, Sung Chul (Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine)
Publication Information
Tuberculosis and Respiratory Diseases / v.59, no.2, 2005 , pp. 142-150 More about this Journal
Abstract
Background : Continuous growth stimulation by various factors, as well as chronic oxidative stress, may co-exist in many solid tumors, such as lung cancer. A new family of antioxidant proteins, the peroxiredoxins (Prxs), have been implicated in the regulation of many cellular processes, including cell proliferation, differentiation and apoptosis. However, a real pathophysiological significance of Prx proteins, especially in lung disease, has not been sufficiently defined. Therefore, this study was conducted to investigate the distribution and expression of various Prx isoforms in lung cancer and other pulmonary conditions. Method : Patients diagnosed with lung cancer, and who underwent surgery at the Ajou Medical Center, were enrolled. The expressions of Prxs, Thioredoxin (Trx) and Thioredoxin reductase (TR) were analyzed using proteomic techniques and the subcellular localization of Prx proteins was studied using immunohistochemistry on normal mouse lung tissue. Result : Immunohistochemical staining has shown the isoforms of Prx I, II, III and V are predominantly expressed in bronchial and alveolar lining epithelia, as well as in the alveolar macrophages of the normal mouse lung. The isoforms of Prx I and III, and thioredoxin were also found to be over-expressed in the lung cancer tissues compared to their paired normal lung controls. There was also an increased amount of the oxidized form of Prx I, as well as a putative truncated form of Prx III, in the lung cancer samples when analyzed using 2-dimensional electrophoresis. In addition, a 43 kDa intermediate molecular weight protein band, and other high molecular weight bands of over 20 kDa, recognized by the anti-Prx I antibody, were present in the tissue extracts of lung cancer patients on 1-Dimensional electrophoresis, which require further investigation. Conclusion : The over-expressions of Prx I and III, and Trx in human lung cancer tissue, as well as their possible chaperoning function, may represent an attempt by tumor cells to adjust to their microenvironment in a manner advantageous to their survival and proliferation, while maintaining their malignant potential.
Keywords
Lung cancer; Peroxiredoxin; Thioredoxin; Over-expression; Oxidative stress;
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