HIF induces human embryonic stem cell markers in cancer cells

  • Mathieu J
  • Zhang Z
  • Zhou W
 et al. 
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Low oxygen levels have been shown to promote self-renewal in many stem cells. In tumors, hypoxia is associated with aggressive disease course and poor clinical outcomes. Furthermore, many aggressive tumors have been shown to display gene expression signatures characteristic of human embryonic stem cells (hESC). We now tested whether hypoxia might be responsible for the hESC signature observed in aggressive tumors. We show that hypoxia, through hypoxia-inducible factor (HIF), can induce an hESC-like transcriptional program, including the induced pluripotent stem cell (iPSC) inducers, OCT4, NANOG, SOX2, KLF4, cMYC, and microRNA-302 in 11 cancer cell lines (from prostate, brain, kidney, cervix, lung, colon, liver, and breast tumors). Furthermore, nondegradable forms of HIFalpha, combined with the traditional iPSC inducers, are highly efficient in generating A549 iPSC-like colonies that have high tumorigenic capacity. To test potential correlation between iPSC inducers and HIF expression in primary tumors, we analyzed primary prostate tumors and found a significant correlation between NANOG-, OCT4-, and HIF1alpha-positive regions. Furthermore, NANOG and OCT4 expressions positively correlated with increased prostate tumor Gleason score. In primary glioma-derived CD133 negative cells, hypoxia was able to induce neurospheres and hESC markers. Together, these findings suggest that HIF targets may act as key inducers of a dynamic state of stemness in pathologic conditions.

Author-supplied keywords

  • Cell Hypoxia/genetics/physiology
  • Cell Line, Tumor
  • Embryonic Stem Cells/*metabolism/physiology
  • Glioma/genetics/metabolism/pathology
  • HCT116 Cells
  • HT29 Cells
  • HeLa Cells
  • Homeodomain Proteins/biosynthesis/genetics
  • Humans
  • Hypoxia-Inducible Factor 1/biosynthesis/*metabolis
  • Male
  • MicroRNAs/biosynthesis
  • Neoplastic Stem Cells/*metabolism/physiology
  • Octamer Transcription Factor-3/biosynthesis/geneti
  • Prostatic Neoplasms/genetics/metabolism/pathology
  • RNA-Binding Proteins/biosynthesis/genetics
  • SOXB1 Transcription Factors/biosynthesis/genetics
  • Tumor Markers, Biological/*biosynthesis/genetics
  • Up-Regulation

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  • J Mathieu

  • Z Zhang

  • W Zhou

  • A J Wang

  • J M Heddleston

  • C M Pinna

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