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Inhibition of lung tumor growth and augmentation of radiosensitivity by decreasing peroxiredoxin I expression
Miao-Fen Chen1, Peter C Keng, Hungyi Shau
1Department of Radiation Oncology, Chang Gung Memorial Hospital, and Graduate Institute of Clinical Medical Sciences, Chang Gung University, Taipei, Taiwan.
Purpose:
In this study, we examined the role of peroxiredoxin I (Prx I) in lung cancer cell growth in vitro and in vivo and its influence on these tumor cells' sensitivity to radiotherapy.
Methods And Materials:
We established stable transfectants of A549 (p53+) and H1299 (p53-) lung carcinoma cell lines with Prx I antisense to downregulate their Prx I protein. We then examined their in vitro biologic changes and used nude mice xenografts of these cell lines to compare tumor invasion, spontaneous metastatic capacity, and sensitivity to radiotherapy.
Results:
The Prx I antisense transfectants of both cell lines showed a significant reduction in Prx I protein production. Prx I antisense transfectants grew more slowly than did the wild type. As xenografts in mice, A549 Prx I antisense transfectants showed a threefold delay in the generation of palpable tumors. The incidence of spontaneous metastasis of Prx I antisense transfectants was significantly less than that of the wild-type cells. Furthermore, irradiation of Prx I antisense transfectants caused more than twice the growth delay compared with the wild type.
Conclusion:
The results of these studies suggest that inactivation of Prx I may be a promising approach to improve the treatment outcome of patients with lung cancer.
