Enhancing therapeutic HPV DNA vaccine potency through depletion of CD4+CD25+ T regulatory cells

Chi Mu Chuang, Talia Hoory, Archana Monie, Annie Wu, Mei Cheng Wang, Chien Fu Hung

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Therapeutic human papillomavirus (HPV) vaccines targeting E6 and/or E7 antigens represent an opportunity to control HPV-associated lesions. We have previously generated several therapeutic DNA vaccines targeting HPV-16 E7 antigen and generated significant antitumor effects. Since regulatory T cells (Tregs) play an important role in suppressing immune responses against tumors by immunotherapy, such as DNA vaccines, we tested if the therapeutic effects of a DNA vaccine encoding E7 linked to heat shock protein 70 (Hsp70) can be improved by a strategy to deplete Tregs using a anti-CD25 monoclonal antibody (PC61) in vaccinated mice. We found that administration of PC61 prior to vaccination with E7/Hsp70 DNA was capable of generating higher levels of E7-specific CD8+ T cells compared to the control antibody, leading to significantly improved therapeutic and long-term protective antitumor effects against an E7-expressing tumor, TC-1. Thus, a strategy to deplete CD4+CD25+ Tregs in conjunction with therapeutic tumor antigen-specific DNA vaccine may represent a potentially promising approach to control tumor. The clinical implications of our study are discussed.

Original languageEnglish (US)
Pages (from-to)684-689
Number of pages6
Issue number5
StatePublished - Jan 29 2009


  • DNA vaccine
  • Heat shock protein 70 (Hsp70)
  • PC61
  • Regulatory T cells (Tregs)

ASJC Scopus subject areas

  • Molecular Medicine
  • Immunology and Microbiology(all)
  • veterinary(all)
  • Public Health, Environmental and Occupational Health
  • Infectious Diseases


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