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Small interfering RNA expression vector targeting hypoxia-inducible factor 1 alpha inhibits tumor growth in hepatobiliary and pancreatic cancers

Cancer Gene Therapy volume 13, pages 131–140 (2006)Cite this article

Abstract

Hepatobiliary and pancreatic carcinomas are hypovascular tumors that can proliferate under hypoxic conditions. Recent reports have demonstrated that hypoxia-inducible factor 1 alpha (HIF1α) plays an important role in the survival of these cancers. Given these findings, the inhibition of the HIF1α pathway might prove to be a powerful tool in the treatment of these cancers. To inhibit HIF1α expression, we used small interference RNA (siRNA) expression vectors in this study. The transient transfection of siRNA expression vectors significantly reduced both HIF1α mRNA levels (13% of control) and protein levels (41% of control) and significantly inhibited the growth of cancer cell lines (P<0.05). VEGF, Glut1, and aldorase A expressions were also significantly reduced by transfection with these vectors (P<0.05), and we found that these vectors induced apoptosis but not cell cycle arrest. In a subcutaneous tumor model using nude mice, transfected MIA PaCa-2 cells, stably expressing siRNAs, barely formed tumors compared to control (P<0.05). This study thus demonstrates the usefulness of siRNA expression vector in targeting HIF1α and points to a potential clinical role in the treatment of pancreatic and hepatobiliary carcinomas.

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Authors and Affiliations

  1. Department of Surgery, Nara Medical University, Kashihara-city, Nara, Japan

    T Mizuno, M Nagao, Y Yamada, M Narikiyo, M Ueno & Y Nakajima

  2. Department of Chemistry and Biotechnology, School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, Japan

    M Miyagishi & K Taira

  3. Gene Discovery Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan

    K Taira

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  1. T Mizuno
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  2. M Nagao
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  3. Y Yamada
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  5. M Ueno
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  6. M Miyagishi
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  8. Y Nakajima
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Correspondence to Y Yamada.

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Mizuno, T., Nagao, M., Yamada, Y. et al. Small interfering RNA expression vector targeting hypoxia-inducible factor 1 alpha inhibits tumor growth in hepatobiliary and pancreatic cancers. Cancer Gene Ther 13, 131–140 (2006). https://doi.org/10.1038/sj.cgt.7700871

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