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Suppression of tumor growth and pulmonary metastasis in murine osteosarcoma using gene therapy
Masashi Seto1, Takashi Yamazaki, Jun Sonoda
1Department of Orthopaedic Surgery, Mie University School of Medicine, Tsu city, Mie prefecture 514, Japan. m-seto@clin.medic.mie-u.ac.jp
Abstract:
We evaluated the effect of gene therapy in the murine osteosarcoma cell line, LM8, which preferentially metastasizes to the lungs. LM8 cells were transduced with the gene for a herpes simplex virus thymidine kinase (HSV-tk) or Escherichia coli beta-galactosidase (lacZ). We investigated the cytotoxicity of LM8 cells bearing an HSV-tk gene after treatment with ganciclovir (GCV). LM8 cells bearing an HSV-tk gene were more sensitive than non-transduced cells. The remarkable inhibition of tumor growth and pulmonary metastases was confirmed in vivo. Our findings indicated that GCV kills tumor cells transduced with HSV-tk in vitro and in vivo.
Insights
Gene therapy using herpes simplex virus thymidine kinase (HSV-tk) and ganciclovir (GCV) effectively inhibited osteosarcoma tumor growth and lung metastasis in mice. This approach demonstrated significant anti-tumor activity in both cell cultures and living organisms.
Area of Science:
- Oncology
- Gene Therapy
- Cancer Metastasis
Background:
- Osteosarcoma is a primary bone cancer with a high propensity for lung metastasis.
- Gene therapy offers a potential strategy to target cancer cells and inhibit metastasis.
Purpose of the Study:
- To evaluate the efficacy of gene therapy using herpes simplex virus thymidine kinase (HSV-tk) in combination with ganciclovir (GCV) against murine osteosarcoma.
- To assess the impact of this gene therapy on tumor growth and pulmonary metastasis in vivo.
Main Methods:
- Murine osteosarcoma LM8 cells were transduced with the HSV-tk gene or Escherichia coli beta-galactosidase (lacZ) gene.
- Cytotoxicity of HSV-tk transduced cells was assessed after treatment with ganciclovir (GCV) in vitro.
- Tumor growth and lung metastasis inhibition were evaluated in vivo.
Main Results:
- LM8 cells engineered to express HSV-tk exhibited increased sensitivity to ganciclovir (GCV) compared to control cells.
- Significant inhibition of primary tumor growth was observed in vivo.
- A remarkable reduction in pulmonary metastases was confirmed in treated mice.
Conclusions:
- Gene therapy with HSV-tk and subsequent ganciclovir treatment is a potent strategy for controlling osteosarcoma.
- This approach effectively reduces both primary tumor burden and metastatic spread to the lungs.