Characterization of DNA vaccines encoding the domains of calreticulin for their ability to elicit tumor-specific immunity and antiangiogenesis

Vaccine. 2005 May 31;23(29):3864-74. doi: 10.1016/j.vaccine.2004.10.032. Epub 2004 Nov 24.

Abstract

Antigen-specific cancer immunotherapy and antiangiogenesis are feasible strategies for cancer therapy because they can potentially treat systemic tumors at multiple sites in the body while discriminating between neoplastic and non-neoplastic cells. We have previously developed a DNA vaccine encoding calreticulin (CRT) linked to human papillomavirus-16 E7 and have found that this vaccine generates strong E7-specific antitumor immunity and antiangiogenic effects in vaccinated mice. In this study, we characterized the domains of CRT to produce E7-specific antitumor immunity and antiangiogenic effects by generating DNA vaccines encoding each of the three domains of CRT (N, P, and C domains) linked to the HPV-16 E7 antigen. We found that C57BL/6 mice vaccinated intradermally with DNA encoding the N domain of CRT (NCRT), the P domain of CRT (PCRT), or the C domain of CRT (CCRT) linked with E7 exhibited significant increases in E7-specific CD8(+) T cell precursors and impressive antitumor effects against E7-expressing tumors compared to mice vaccinated with wild-type E7 DNA. In addition, the N domain of CRT also showed antiangiogenic properties that might have contributed to the antitumor effect of NCRT/E7. Thus, the N domain of CRT can be linked to a tumor antigen in a DNA vaccine to generate both antigen-specific immunity and antiangiogenic effects for cancer therapy.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Angiogenesis Inhibitors*
  • Animals
  • CD4-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / immunology
  • Calreticulin / genetics
  • Calreticulin / immunology*
  • Cancer Vaccines / immunology*
  • Cell Line, Transformed
  • Lung Neoplasms / blood supply
  • Lung Neoplasms / immunology
  • Lung Neoplasms / prevention & control
  • Mice
  • Mice, Inbred C57BL
  • Neoplasm Transplantation
  • Oncogene Proteins, Viral / genetics
  • Oncogene Proteins, Viral / immunology*
  • Papillomavirus E7 Proteins
  • Protein Structure, Tertiary
  • Vaccines, DNA / genetics
  • Vaccines, DNA / immunology*
  • Vaccines, Synthetic

Substances

  • Angiogenesis Inhibitors
  • Calreticulin
  • Cancer Vaccines
  • Oncogene Proteins, Viral
  • Papillomavirus E7 Proteins
  • Vaccines, DNA
  • Vaccines, Synthetic
  • oncogene protein E7, Human papillomavirus type 16