Particle-mediated gene transfer of granulocyte-macrophage colony-stimulating factor cDNA to tumor cells: implications for a clinically relevant tumor vaccine

Hum Gene Ther. 1996 Aug 20;7(13):1535-43. doi: 10.1089/hum.1996.7.13-1535.


The necessity for prolonged tissue culture manipulations limits the clinical application of many form of gene therapy in patients with malignancies. We hypothesized that granulocyte-macrophage colony-stimulating factor (GM-CSF) cDNA in a plasmid expression vector could be effectively introduced into resting tumor cells, without the need for tissue culture propagation prior to or following transfection, and that efficient expression of transgenic GM-CSF by the transfected tumor cells would confer an effective immune response against tumors. GM-CSF cDNA in expression vectors was coated onto gold particles and accelerated with a gene gun device into mouse and human tumor cells. Human tumor tissue transfected within 4 hr of surgery produced significant levels of transgenic human GM-CSF protein in vitro. Human GM-CSF was readily detectable in serum and at the injection site following subcutaneous implantation of these transfected tumor cells into nude mice. Transfected and irradiated murine B16 melanoma cells produced > or = 100 ng/ml murine GM-CSF/10(6) cells per 24 hr in vitro for at least 10 days. The antitumor efficacy of this nonviral approach was tested using irradiated B16 tumor cells that were transfected with mGM-CSF cDNA and injected into mice as tumor "vaccine". Subsequent challenge of these mice with nonirradiated, nontransfected B16 tumor cells showed that 58% of the animals wer protected from the tumor by the prior vaccine treatment. In contrast, only 2% of control animals were protected by prior treatment with irradiated B16 cells transfected with the vector containing the luciferase gene. These results suggest that particle-mediated transfection of fresh tumor explants with cytokine cDNA is an effective and clinically attractive approach for cancer therapy.

MeSH terms

  • Animals
  • Biolistics
  • DNA, Complementary / genetics
  • DNA, Complementary / metabolism*
  • Gamma Rays
  • Gene Expression Regulation, Neoplastic / genetics
  • Gene Transfer Techniques*
  • Genetic Vectors / genetics
  • Gold / metabolism
  • Granulocyte-Macrophage Colony-Stimulating Factor / genetics*
  • Histology
  • Humans
  • Immunotherapy
  • Mice
  • Mice, Inbred Strains
  • Neoplasms / therapy
  • Neoplasms, Experimental / metabolism
  • Particle Size
  • Transfection / genetics
  • Tumor Cells, Cultured
  • Vaccines / immunology*


  • DNA, Complementary
  • Vaccines
  • Gold
  • Granulocyte-Macrophage Colony-Stimulating Factor