Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Hiwi Knockdown Inhibits the Growth of Lung Cancer in Nude Mice

  • Liang, Dong (Hainan Province Nongken Sanya Hospital) ;
  • Dong, Min (The Fourth Affiliated Hospital of Harbin Medical University) ;
  • Hu, Lin-Jie (Hainan Province Nongken Sanya Hospital) ;
  • Fang, Ze-Hui (The Fourth Affiliated Hospital of Harbin Medical University) ;
  • Xu, Xia (Hainan Province Nongken Sanya Hospital) ;
  • Shi, En-Hui (Anorectal Department of the Central Hospital of Jiamusi City) ;
  • Yang, Yi-Ju (Hainan Province Nongken Sanya Hospital)
  • Published : 2013.02.28
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Abstract

Hiwi, a human homologue of the Piwi family, plays an important role in stem cell self-renewal and is overexpressed in various human tumors. This study aimed to determine whether an RNA interference-based strategy to suppress Hiwi expression could inhibit tumor growth in a xenograft mouse model. A rare population of $SSC^{lo}\;Alde^{br}$ cells was isolated and identified as lung cancer stem cells in our previous study. Plasmids containing U6 promoter-driven shRNAs against Hiwi or control plasmids were successfully established. The xenograft tumor model was generated by subcutaneously inoculating with lung cancer stem cell $SSC^{lo}\;Alde^{br}$ cells. After the tumor size reached about 8 mm in diameter, shRNA plasmids were injected into the mice via the tail vein three times a week for two weeks, then xenograft tumor growth was assessed. In nude mice, intravenously delivery of Hiwi shRNA plasmids significantly inhibited tumor growth compared to treatment with control scrambled shRNA plasmids or the vehicle PBS. No mice died during the experiment and no adverse events were observed in mice administered the plasmids. Moreover, delivery of Hiwi shRNA plasmids resulted in a significant suppressed expression of Hiwi and ALDH-1 in xenograft tumor samples, based on immunohistochemical analysis. Thus, shRNA-mediated Hiwi gene silencing in lung cancer stem cells by an effective in vivo gene delivery strategy appeared to be an effective therapeutic approach for lung cancer, and may provide some useful clues for RNAi gene therapy in solid cancers.

Keywords

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