Effect of eIF3a on response of lung cancer patients to platinum-based chemotherapy by regulating DNA repair

Ji Ye Yin, Jie Shen, Zi Zheng Dong, Qiong Huang, Mei Zuo Zhong, De Yun Feng, Hong Hao Zhou, Jian Ting Zhang, Zhao Qian Liu

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49 Scopus citations

Abstract

Purpose: The purpose of this study is to test the hypothesis that eIF3a may regulate the expression of DNA repair proteins which, in turn, affects response of lung cancer patients to treatments by DNAdamaging anticancer drugs. Experimental Design: Immunohistochemistry was used to determine the expression of eIF3a in 211 human lung cancer tissues followed by association analysis of eIF3a expression with patient's response to platinum-based chemotherapy. Ectopic overexpression and RNA interference knockdown of eIF3a were carried out in NIH3T3 and H1299 cell lines, respectively, to determine the effect of altered eIF3a expression on cellular response to cisplatin, doxorubicine, etoposide (VP-16), vincristine, and vinblastine by using MTT assay. The DNA repair capacity of these cells was evaluated by using host-cell reactivation assay. Real-time reverse transcriptase PCR and Western Blot analyses were carried out to determine the effect of eIF3a on the DNA repair genes by using cells with altered eIF3a expression. Results: eIF3a expression associates with response of lung cancer patients to platinum-based chemotherapy. eIF3a knockdown or overexpression, respectively, increased and decreased the cellular resistance to cisplatin and anthrocycline anticancer drugs, DNA repair activity, and expression of DNA repair proteins. Conclusions: eIF3a plays an important role in regulating the expression of DNA repair proteins which, in turn, contributes to cellular response to DNA-damaging anticancer drugs and patients' response to platinum-based chemotherapy.

Original languageEnglish (US)
Pages (from-to)4600-4609
Number of pages10
JournalClinical Cancer Research
Volume17
Issue number13
DOIs
StatePublished - Jul 1 2011

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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    Yin, J. Y., Shen, J., Dong, Z. Z., Huang, Q., Zhong, M. Z., Feng, D. Y., Zhou, H. H., Zhang, J. T., & Liu, Z. Q. (2011). Effect of eIF3a on response of lung cancer patients to platinum-based chemotherapy by regulating DNA repair. Clinical Cancer Research, 17(13), 4600-4609. https://doi.org/10.1158/1078-0432.CCR-10-2591