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Article

Antitumor DNA vaccination against the Sox2 transcription factor

  • Authors:
    • Ingrid Polakova
    • Martina Duskova
    • Michal Smahel
  • View Affiliations / Copyright

    Affiliations: Department of Experimental Virology, Institute of Hematology and Blood Transfusion, 128 20 Prague 2, Czech Republic
  • Pages: 139-146
    |
    Published online on: April 28, 2014
       https://doi.org/10.3892/ijo.2014.2402
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Abstract

As cancer stem cells (CSCs) are resistant to chemotherapy, radiotherapy and targeted molecular therapy, immunotherapy of tumors could be aimed at their elimination. Markers specific for CSCs have not been identified to date, but microarray analyses have shown that CSCs and embryonic stem cells use similar transcriptional programs, thus suggesting the production of shared transcription factors. In this study, we developed an experimental DNA vaccine against the transcription factor Sox2 that is important for self-renewal of stem cells and is overexpressed in numerous human cancers. The Sox2 gene was codon optimized for the expression in human cells, its sequences encoding two nuclear localization signals (NLSs) were mutagenized, and the sequence coding for the PADRE helper epitope was fused with its 5' terminus. While codon optimization did not increase Sox2 production and mutagenesis in NLSs only partially reduced nuclear localization of Sox2, the addition of the PADRE epitope was crucial for the enhancement of Sox2 immunogenicity. The antitumor effect was shown after immunization against mouse oncogenic TC-1/B7 cells derived from the lung cancer cell line TC-1 and characterized by high Sox2 production. Sox2-specific reactivity in an ELISPOT assay was further augmented by the depletion of regulatory T (Treg) cells, but this depletion did not enhance the antitumor effect. These data demonstrated the induction of immune responses against the Sox2 self-antigen, but did not confirm the usefulness of Treg depletion when combined with antitumor vaccination.
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Copy and paste a formatted citation
Spandidos Publications style
Polakova I, Duskova M and Smahel M: Antitumor DNA vaccination against the Sox2 transcription factor. Int J Oncol 45: 139-146, 2014.
APA
Polakova, I., Duskova, M., & Smahel, M. (2014). Antitumor DNA vaccination against the Sox2 transcription factor. International Journal of Oncology, 45, 139-146. https://doi.org/10.3892/ijo.2014.2402
MLA
Polakova, I., Duskova, M., Smahel, M."Antitumor DNA vaccination against the Sox2 transcription factor". International Journal of Oncology 45.1 (2014): 139-146.
Chicago
Polakova, I., Duskova, M., Smahel, M."Antitumor DNA vaccination against the Sox2 transcription factor". International Journal of Oncology 45, no. 1 (2014): 139-146. https://doi.org/10.3892/ijo.2014.2402
Copy and paste a formatted citation
x
Spandidos Publications style
Polakova I, Duskova M and Smahel M: Antitumor DNA vaccination against the Sox2 transcription factor. Int J Oncol 45: 139-146, 2014.
APA
Polakova, I., Duskova, M., & Smahel, M. (2014). Antitumor DNA vaccination against the Sox2 transcription factor. International Journal of Oncology, 45, 139-146. https://doi.org/10.3892/ijo.2014.2402
MLA
Polakova, I., Duskova, M., Smahel, M."Antitumor DNA vaccination against the Sox2 transcription factor". International Journal of Oncology 45.1 (2014): 139-146.
Chicago
Polakova, I., Duskova, M., Smahel, M."Antitumor DNA vaccination against the Sox2 transcription factor". International Journal of Oncology 45, no. 1 (2014): 139-146. https://doi.org/10.3892/ijo.2014.2402
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