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Interferon-gamma-producing tumor induces host tumor-specific T cell responses
Y Teramura1, Y Watanabe, N Kan
1Institute for Immunology, Kyoto University.
Japanese Journal of Cancer Research : Gann
|June 1, 1993
Summary
Tumor cells engineered to produce interferon-gamma (IFN-gamma) showed reduced growth and were rejected by mice. This rejection was mediated by cytotoxic T cells, highlighting IFN-gamma
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- Investigating host immune responses to tumors with low immunogenicity.
- Understanding the role of interferon-gamma (IFN-gamma) in tumor rejection.
Purpose of the Study:
- To elucidate the mechanism of host immune responses against IFN-gamma gene-transduced tumors.
- To determine the role of T cells and IFN-gamma in tumor rejection.
Main Methods:
- Gene transduction of tumors with IFN-gamma.
- In vivo administration of anti-CD8, anti-CD4, and anti-IFN-gamma monoclonal antibodies.
- Assessment of tumor rejection and protection against subsequent challenge.
- Evaluation of cytotoxic T cell activity in vitro.
Main Results:
- IFN-gamma-producing tumors exhibited reduced tumorigenicity and were rejected by syngeneic mice.
- Rejection was blocked by anti-CD8 and anti-IFN-gamma antibodies; anti-CD4 had differential effects.
- Mice rejecting IFN-gamma-producing tumors showed specific protection against parental tumor challenge.
- Immune lymphocytes displayed cytotoxic T cell activity against both parental and engineered tumor cells.
Conclusions:
- Antitumor effects are mediated by cytotoxic T cells and partly by helper T cells.
- Locally secreted IFN-gamma is crucial for generating these effector T cells.
- IFN-gamma gene transfer enhances tumor immunogenicity and facilitates rejection.