Role of peroxiredoxin i in rectal cancer and related to p53 status

Miao Fen Chen, Kuan Der Lee, Chung Hung Yeh, Wen Cheng Chen, Wen Shih Huang, Chih Chien Chin, Paul Yang Lin, Jeng Yi Wang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Background: Neoadjuvant chemoradiotherapy is widely accepted for the treatment of localized rectal cancer. Although peroxiredoxin I (PrxI) and p53 have been implicated in carcinogenesis and cancer treatment, the role of PrxI and its interaction with p53 in the prognosis and treatment response of rectal cancer remain relatively unstudied. Methods and Materials: In the present study, we examined the levels of PrxI and p53 in rectal cancer patients using membrane arrays and compared them with normal population samples. To demonstrate the biologic changes after manipulation of PrxI expression, we established stable transfectants of HCT-116 (wild-type p53) and HT-29 (mutant p53) cells with a PrxI silencing vector. The predictive capacities of PrxI and p53 were also assessed by relating the immunohistochemical staining of a retrospective series of rectal cancer cases to the clinical outcome. Results: The membrane array and immunochemical staining data showed that PrxI, but not p53, was significantly associated with the tumor burden. Our immunochemistry findings further indicated that PrxI positivity was linked to a poor response to neoadjuvant therapy and worse survival. In cellular and animal experiments, the inhibition of PrxI significantly decreased tumor growth and sensitized the tumor to irradiation, as indicated by a lower capacity to scavenge reactive oxygen species and more extensive DNA damage. The p53 status might have contributed to the difference between HCT-116 and HT-29 after knockdown of PrxI. Conclusion: According to our data, the level of PrxI combined with the p53 status is relevant to the prognosis and the treatment response. We suggested that PrxI might be a new biomarker for rectal cancer.

Original languageEnglish
Pages (from-to)868-878
Number of pages11
JournalInternational Journal of Radiation Oncology Biology Physics
Volume78
Issue number3
DOIs
Publication statusPublished - 2010
Externally publishedYes

Keywords

  • p53 status
  • Peroxiredoxin I
  • radiation
  • rectal cancer

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation
  • Cancer Research
  • Medicine(all)

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