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KMID : 0364020070400080529
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Korean Journal of Thoracic and Cardiovascular Surgery
2007 Volume.40 No. 8 p.529 ~ p.535
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Alteration of Apurinic/Apyrimidinic Endonuclease-1/Redox Factor-1 in Human Non-small Cell Lung Cancer
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Yoo Dae-Goon
Kang Min-Woong
Han Jong Hee
Lim Seung-Pyung
Jeon Byeong-Hwa
Song Yun-Jeong
Cho Eun-Jung
Na Myung-Hoon
Yu Jae-Hyeon
Lee Young
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Abstract
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Background:An imbalance between oxidants and antioxidants leads to oxidative stress, and this has been proposed to play an important role in the pathogenesis of lung neoplasm. Apurinic/apyrimidinic endonuclease-1/redox factor-1 (APE/ref-1) is a multifunctional protein involved in DNA base excision repair and the redox regulation of many transcription factors. However, the alteration of the expressed levels of APE/ref-1 in non-small cell lung cancer is unknown.
Material and Method:Forty-nine patients with surgically resected non-small cell lung cancer (NSCLC) were included in this study. Immunohistochemical staining with APE/ref-1 antibodies was performed, and their expressions were analyzed via Western blotting for specific antibodies.
Result:APE/ref-1 was localized at the nucleus and mainly in the non-tumor region of the NSCLC tissue specimens; it was expressed in the cytoplasm and nucleus of the NSCLC. The nuclear and cytoplasmic expressions of APE/ref-1 in lung cancers were markedly up-regulated in the NSCLC, and this was correlated with the clinical stage. Catalase, as first-line antioxidant defense, was dramatically decreased in the NSCLC.
Conclusion:Taken together, our results suggest that APE/ref-1, and especially cytoplasmic APE/ref-1, was upregulated in the lung cancer regions, and this may contribute to the compensatory defense system against oxidative stress. A low expression of catalase might have fundamental effects on the extracellular redox state of lung tumors, along with the potential consequences for the tumors.
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KEYWORD
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Lung neoplasms, Proteins
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