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Int J Radiat Oncol Biol Phys. 2006 Feb 1;64(2):581-91.

Inhibition of lung tumor growth and augmentation of radiosensitivity by decreasing peroxiredoxin I expression.

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1
Department of Radiation Oncology, Chang Gung Memorial Hospital, and Graduate Institute of Clinical Medical Sciences, Chang Gung University, Taipei, Taiwan.

Abstract

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.

PMID:
16414373
DOI:
10.1016/j.ijrobp.2005.10.012
[Indexed for MEDLINE]
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