A novel recombinant protein of IP10-EGFRvIIIscFv and CD8(+) cytotoxic T lymphocytes synergistically inhibits the growth of implanted glioma in mice

Cancer Immunol Immunother. 2013 Jul;62(7):1261-72. doi: 10.1007/s00262-013-1426-6. Epub 2013 May 3.

Abstract

The epidermal growth factor receptor (EGFR) mutant of EGFRvIII is highly expressed on glioma cells and has been thought to be an excellent target molecule for immunotherapy. IP-10 is a potent chemokine and can recruit CXCR3(+) T cells, including CD8(+) T cells that are important for the control of tumor growth. This study is aimed at investigating the therapeutic efficacy of a novel fusion protein of IP10-EGFRvIIIscFv (IP10-scFv) in combination with glioma lysate-pulsed DCs-activated CD8(+) cytotoxic T lymphocytes (CTLs) in a mouse model of glioma. A plasmid of pET-IP10-scFv was generated by linking mouse IP-10 gene with the DNA fragment for anti-EGFRvIIIscFv, a (Gly4Ser)3 flexible linker and a His-tag. The recombinant IP10-scFv in E. coli was purified by affinity chromatography and characterized for its anti-EGFRvIII immunoreactivity and chemotactic activity. C57BL/6 mice were inoculated with mouse glioma GL261 cells in the brain and treated intracranially with IP10-scFv and/or intravenously with CTL for evaluating the therapeutic effect. The glioma-specific immune responses were examined. The IP10-scFv retained anti-EGFRvIII immunoreactivity and IP-10-like chemotactic activity. Treatment with both IP10-scFv and CTL synergistically inhibited the growth of glioma and prolonged the survival of tumor-bearing mice, accompanied by increasing the numbers of brain-infiltrating lymphocytes (BILs) and the frequency of CXCR3(+)CD8(+) T cells, enhancing glioma-specific IFN-γ responses and cytotoxicity, and promoting glioma cell apoptosis in mice. Our novel data indicate that IP10-scFv and CTL have synergistic therapeutic effects on inhibiting the growth of mouse glioma in vivo.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / drug effects
  • Brain Neoplasms / immunology
  • Brain Neoplasms / therapy*
  • Cell Line, Tumor
  • Cell Proliferation / drug effects
  • ErbB Receptors / genetics
  • ErbB Receptors / immunology*
  • Female
  • Glioma / immunology
  • Glioma / therapy*
  • Immunotherapy
  • Mice
  • Mice, Inbred C57BL
  • Receptors, Cytokine / genetics
  • Receptors, Cytokine / immunology*
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / immunology
  • Recombinant Fusion Proteins / therapeutic use
  • Single-Chain Antibodies / genetics
  • Single-Chain Antibodies / immunology*
  • T-Lymphocytes, Cytotoxic / immunology*
  • T-Lymphocytes, Cytotoxic / metabolism

Substances

  • IP10-Mig receptor
  • Receptors, Cytokine
  • Recombinant Fusion Proteins
  • Single-Chain Antibodies
  • epidermal growth factor receptor VIII
  • ErbB Receptors