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Antitumor effect induced by the expression of granulocyte macrophage-colony stimulating factor gene in murine colon
Y Gunji1, M Tagawa, H Matsubara
1Department of Surgery (II), School of Medicine, Chiba University, Japan.
Abstract:
Murine colon carcinoma cells which secrete several kinds of cytokine after retroviral transduction with corresponding genes, were examined for their antitumor effects in syngeneic mice. The mice inoculated with granulocyte macrophage-colony stimulating factor (GM-CSF) producer cells showed not only prolonged survival but also reduced tumorigenicity. The antitumor effect caused by the expression of interleukin-4 was less than that of GM-CSF, and interleukin-6 producer cells did not show any effects on the survival of the host animals. Histological examination of the GM-CSF-producing tumor revealed predominant infiltration of neutrophils and necrotic change of the tumor. The present study indicates the feasibility of cancer gene therapy with the expression of GM-CSF gene in tumor cells.
Insights
Cancer gene therapy using granulocyte macrophage-colony stimulating factor (GM-CSF) showed significant antitumor effects in mice. GM-CSF producing tumor cells prolonged survival and reduced tumor growth, indicating therapeutic potential.
Area of Science:
- Oncology
- Immunotherapy
- Gene Therapy
Background:
- Cytokines play a crucial role in immune responses and cancer development.
- Retroviral transduction allows for the genetic modification of tumor cells to express specific cytokines.
- Evaluating the in vivo efficacy of cytokine-engineered tumor cells is essential for cancer therapy development.
Purpose of the Study:
- To investigate the antitumor effects of murine colon carcinoma cells engineered to secrete cytokines.
- To compare the efficacy of granulocyte macrophage-colony stimulating factor (GM-CSF), interleukin-4 (IL-4), and interleukin-6 (IL-6) expression in vivo.
- To assess the feasibility of GM-CSF gene therapy for colon carcinoma.
Main Methods:
- Retroviral transduction of murine colon carcinoma cells with genes encoding GM-CSF, IL-4, or IL-6.
- Inoculation of syngeneic mice with engineered tumor cells.
- Monitoring of animal survival, tumor growth, and performing histological examinations.
Main Results:
- Mice inoculated with GM-CSF-producing cells exhibited prolonged survival and reduced tumorigenicity.
- IL-4-producing cells demonstrated a lesser antitumor effect compared to GM-CSF.
- IL-6-producing cells did not significantly impact host survival.
- Histological analysis of GM-CSF tumors revealed neutrophil infiltration and necrosis.
Conclusions:
- GM-CSF expression in tumor cells confers significant antitumor effects in a murine model.
- GM-CSF demonstrates superior efficacy over IL-4 and IL-6 in this context.
- The study supports the feasibility of using GM-CSF gene therapy for colon carcinoma treatment.