Gene therapy for metastatic brain tumors by vaccination with granulocyte-macrophage colony-stimulating factor-transduced tumor cells

Human Gene Therapy
J S YuX O Breakefield

Abstract

We have developed an ex vivo gene therapy paradigm for the treatment of brain tumors using granulocyte-macrophage colony-stimulating factor (GM-CSF). Murine B16 melanoma cells were infected with MFG recombinant retrovirus containing the mouse GM-CSF cDNA. Subcutaneous vaccination of syngeneic mice with irradiated GM-CSF-secreting B16 melanoma cells was capable of completely protecting animals against subsequent intracranial B16 tumor inoculation, with up to 5 x 10(3) cells. Histologic evaluation revealed the presence of neutrophils, eosinophils, and lymphocytes, including CD4+, CD8+, and CD45R+ cells, in the intracerebral inoculation site, peaking 4 days after intracranial inoculation. In contrast, nonvaccinated animals or animals vaccinated with irradiated, nontransduced B16 cells succumbed to intracranial tumor within 3 weeks after inoculation. Treatment of established intracranial B16 melanoma tumors with subcutaneous injection of irradiated GM-CSF-secreting B16 cells significantly delayed death, as compared to injection of irradiated nontransduced B16 cells or no treatment. In addition, treatment of established intracerebral GL261 gliomas by vaccination with irradiated GM-CSF-secreting B16 cells mixed with irradiated, trans...Continue Reading

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