Nuclear localization signal-enhanced RNA interference of EZH2 and Oct4 in the eradication of head and neck squamous Cell carcinoma-derived cancer stem cells

Wen Liang Lo, Yueh Chien, Guang-Yuh Chiou, Ling Ming Tseng, Han Shui Hsu, Yuh Lih Chang, Kai Hsi Lu, Chian Shiu Chien, Mong Lien Wang, Yi Wei Chen, Pin I. Huang, Fang Wei Hu, Cheng Chia Yu, Pen Yuan Chu, Shih Hwa Chiou*

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

Metastasis is the major cause of high mortality in head and neck squamous cell carcinoma (HNSCC), in which HNSCC-derived cancer stem cells (CSCs) may be involved. Several reports have coupled non-viral gene delivery with RNA interference (RNAi) to target specific genes in cancer cells. However, the delivery efficiency of RNAi is limited and remained to be improved. Moreover, the therapeutic effect of non-viral gene delivery approaches on HNSCC-derived CSCs is still uncertain. In this study, we found that EZH2 and Oct4 are upregulated in HNSCC-derived ALDH1+/CD44+ CSC-like cells. Polyurethane-short branch PEI (PU-PEI)-based administration of double-stranded DNA (dsDNA) encoding small interfering RNA (siRNA) against EZH2 and Oct4 (siEZH2/siOct4) led to partial anti-cancer capacity and mild suppression of CSC-like properties. By pre-conjugation of nuclear localization signal (NLS) to siRNA-expressing dsDNA, the anti-cancer efficacy was enhanced due to elevated nuclear delivery. Notably, the NLS-preconjugated siEZH2/siOct4 constructs remarkably repressed epithelial-mesenchymal transdifferentiation (EMT) and radioresistance in ALDH1+/CD44+ CSC-like cells, in which Wnt5A and CyclinD1 may be involved respectively. We furthermore demonstrated that this improved method was capable of reducing tumor growth and metastasis in vivo. Our findings may provide a feasible non-viral gene delivery method to eradicate HNSCC-derived CSCs and improve HNSCC therapy.

Original languageEnglish
Pages (from-to)3693-3709
Number of pages17
JournalBiomaterials
Volume33
Issue number14
DOIs
StatePublished - 1 May 2012

Keywords

  • EZH2
  • Head and neck squamous cell carcinoma
  • Nuclear localization signal
  • Oct4
  • Small interfering RNA

Fingerprint Dive into the research topics of 'Nuclear localization signal-enhanced RNA interference of EZH2 and Oct4 in the eradication of head and neck squamous Cell carcinoma-derived cancer stem cells'. Together they form a unique fingerprint.

  • Cite this

    Lo, W. L., Chien, Y., Chiou, G-Y., Tseng, L. M., Hsu, H. S., Chang, Y. L., Lu, K. H., Chien, C. S., Wang, M. L., Chen, Y. W., Huang, P. I., Hu, F. W., Yu, C. C., Chu, P. Y., & Chiou, S. H. (2012). Nuclear localization signal-enhanced RNA interference of EZH2 and Oct4 in the eradication of head and neck squamous Cell carcinoma-derived cancer stem cells. Biomaterials, 33(14), 3693-3709. https://doi.org/10.1016/j.biomaterials.2012.01.016