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The Role of Heme Oxygenase-1 in Lung Cancer Cells  

Jung, Jong-Hoon (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, Hak-Ryul (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, Eun-Jung (Department of Internal Medicine, College of Medicine Wonkwang University)
Hwang, Ki-Eun (Department of Internal Medicine, College of Medicine Wonkwang University)
Kim, So-Young (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)
Yang, Sei-Hoon (Department of Internal Medicine, College of Medicine Wonkwang University)
Jeong, Eun-Taek (Department of Internal Medicine, College of Medicine Wonkwang University)
Publication Information
Tuberculosis and Respiratory Diseases / v.60, no.3, 2006 , pp. 304-313 More about this Journal
Abstract
Background : Heme oxygenase-1 (HO-1) is an inducible enzyme that catalyzes the oxidative degradation of heme to form biliverdin, carbon monoxide (CO), and free iron. The current evidence has indicated a critical role of HO-1 in cytoprotection and also in other, more diverse biological functions. It is known that the high expression of HO-1 occurs in various tumors, and that HO-1 has an important role in rapid tumor growth because of its antioxidative and antiapoptotic effects. Therefore, the role of HO-1 was analyzed in human lung cancer cell lines, and especially in the A549 cell line. Material and Methods : Human lung cancer cell lines, i.e., A549, NCI-H23, NCI-H157 and NCI-H460, were used for this study. The expression of HO-1 in the untreated state was defined by Western blotting. ZnPP, which is the specific HO inhibitor we used, and the viability of cells were tested for by conducting MTT assaysy. The HO enzymatic activity, as determined via the bilirubin level, was also indirectly measured. Moreover, the generation of intracellular hydrogen peroxide (H2O2) was monitored fluorimetrically with using a scopoletin-horse radish peroxidase (HRP) assay and 2',7'-dichlorofluorescein diacetate (DCFH-DA). We have also transfected small HO-1 interfering RNA (siRNA) into A549 cells, and the apoptotic effects were evaluated by flow cytometric analysis and Western blotting. Results : The A549 cells had a greater expression of HO-1 than the other cell lines, whereas ZnPP significantly decreased the viability of the A549 cells more than the viability of the other lung cancer cells in a dose-dependant fashion. Consistent with the viability, the HO enzymatic activity also was decreased. Moreover, intracellular H2O2 generation via ZnPP was induced in a dose-dependent manner. Apoptotic events were, then induced in the HO-1 siRNA transfected A549 cells. Conclusion : HO-1 provides new important insights into the possible molecular mechanism of the antitumor therapy in lung cancer.
Keywords
Heme oxygenase-1; Lung cancer;
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