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The Effect of Inhibition of Heme Oxygenase-1 on Chemosensitivity of Cisplatin in Lung Cancer Cells  

Kim, So-Young (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, Eun-Jung (Department of Internal Medicine, College of Medicine Wonkwang University)
Jang, Hye-Yeon (Department of Internal Medicine, College of Medicine Wonkwang University)
Hwang, Ki-Eun (Department of Internal Medicine, College of Medicine Wonkwang University)
Park, Jung-Hyun (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, Hwi-Jung (Department of Internal Medicine, College of Medicine Wonkwang University)
Jo, Hyang-Jeong (Department of Pathology Kunsan Medical Center of Wonkwang University Hospital)
Yang, Sei-Hoon (Department of Internal Medicine, College of Medicine Wonkwang University)
Jeong, Eun-Taik (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, Hak-Ryul (Department of Internal Medicine, College of Medicine Wonkwang University)
Publication Information
Tuberculosis and Respiratory Diseases / v.62, no.1, 2007 , pp. 33-42 More about this Journal
Abstract
Background: Heme oxygenase-1 (HO-1) is known to modulates the cellular functions, including cell proliferation and apoptosis. It is known that a high level of HO-1 expression is found in many tumors, and HO-1 plays an important role in rapid tumor growth on account of its antioxidant and antiapoptotic effects. Cisplatin is a widely used anti-cancer agent for the treatment of lung cancer. However, the development of resistance to cisplatin is a major obstacle to its use in clinical treatment. We previously demonstrated that inhibiting HO-1 expression through the transcriptional activation of Nrf2 induces apoptosis in A549 cells. The aim of this study was to determine of the inhibiting HO-1 enhance the chemosensitivity of A549 cells to cisplatin. Materials and Methods: The human lung cancer cell line, A549, was treated cisplatin, and the cell viability was measured by a MTT assay. The change in HO-1, Nrf2, and MAPK expression after the cisplatin treatment was examined by Western blotting. HO-1 inhibition was suppressed by ZnPP, which is a specific pharmacologic inhibitor of HO activity, and small interfering RNA (siRNA). Flow cytometry analysis and Western blot were performed in to determine the level of apoptosis. The level of hydrogen peroxide ($H_2O_2$) generation was monitored fluoimetrically using 2',7'-dichlorofluorescein diacetate. Results: The A549 cells showed more resistance to the cisplatin treatment than the other cell lines examined, whereas cisplatin increased the expression of HO-1 and Nrf2, as well as the phosphorylation of MAPK in a time-dependent fashion. Inhibitors of the MAPK pathway blocked the induction of HO-1 and Nrf2 by the cisplatin treatment in A549 cells. In addition, the cisplatin-treated A549 cells transfected with dither the HO-1 small interfering RNA (siRNA) or ZnPP, specific HO-1 inhibitor, showed in a more significantly decrease in viability than the cisplatin-only-treated group. The combination treatment of ZnPP and cisplatin caused in a marked increase in the ROS generation and a decrease in the HO-1 expression. Conclusion: Cisplatin increases the expression of HO-1, probably through the MAPK-Nrf2 pathway, and the inhibition of HO-1 enhances the chemosensitivity of A549 cells to cisplatin.
Keywords
Heme oxygenase-1; Cisplatin; Lung Cancer;
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