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http://dx.doi.org/10.4046/trd.2009.66.4.274

Expression of COX-2 and IDO by Uteroglobin Transduction in NSCLC Cell Lines  

Park, Gun Min (Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine)
Lee, Sang-Min (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Yim, Jae-Joon (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Yang, Seok-Chul (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Yoo, Chul Gyu (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Lee, Choon-Taek (Respiratory Center, Department of Internal Medicine, Seoul National University Bundang Hospital)
Han, Sung Koo (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Sim, Young-Soo (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Kim, Young Whan (Department of Internal Medicine and Lung Institute of Medical Research Center, Seoul National University College of Medicine)
Publication Information
Tuberculosis and Respiratory Diseases / v.66, no.4, 2009 , pp. 274-279 More about this Journal
Abstract
Background: Uteroglobin (UG) is a secretary protein that has strong immunomodulatory properties, and which is synthesized in most epithelia including lung tissue. Overexpression of UG is associated with decreased expression of cyclooxygenase (COX)-2 and suppression of cancer cell growth. Indoleamine 2,3-dioxygenase (IDO) catalyzes tryptophan along the kynurenine pathway, and both the reduction in local tryptophan and the production of tryptophan metabolites contribute to the immunosuppressive effects of IDO. Methods: In this study, we investigated the pattern of expression of COX-2 and IDO, and the effect of UG transduction in the expression of COX-2 and IDO in several non-small cell lung cancer cell lines, especially A549. Results: Both COX-2 and IDO were constitutionally expressed in A549 and H460 cells, and was reduced by UG transduction. In A549 cells, the slightly increased expression of COX-2 and IDO with the instillation of interferon-gamma (IFN-$\gamma$) was reduced by UG transduction. However, the reduced expression of COX-2 and IDO by UG transduction was not increased with IFN-$\gamma$ instillation in A549 cells. In both the A549 COX-2 sense and the A549 COX-2 anti-sense small interfering RNA (siRNA)-transfected cells, IDO was expressed; expression was reduced by UG transduction, irrespective of the expression of COX-2. Conclusion: The results suggest that the anti-proliferative function of UG may be associated with the immune tolerance pathway of IDO, which is independent of the COX-2 pathway.
Keywords
Uteroglobin; Cyclooxygenase 2; Indoleamine 2,3-dioxygenase; Interferon-gamma; Immune tolerance;
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