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Updated: Jun 21, 2026
Experimental Metastasis and CTL Adoptive Transfer Immunotherapy Mouse Model
Published on: November 26, 2010
Relationship of host immune status to tumor cell arrest, distribution, and survival in experimental metastasis
Abstract:
The kinetics of initial arrest in organs, distribution, survival, and fate of 125I-iododeoxyuridine-labeled B16 melanoma tumor cells injected intravenously into normal, tumor-sensitized and immune manipulated syngeneic and allogeneic mice were investigated. Groups of animals were killed at intervals ranging from two minutes to 14 days after intravenous tumor cell injection. Lungs, liver, spleen and blood were collected from each animal and processed so that radioactivity associated with DNA of tumor cells viable at the time of sacrifice could be monitored. The following conclusions can be made: initial tumor cell arrest in organs is influenced by the host immune status but it does not correlate with the survival kinetics or development into tumors. The same tumor, which was rejected in mice after a subcutaneous tumor challenge, grew in the lungs after intravenous injection. Therefore, rejection of a subcutaneous challenge as the sole criterion of host immunity to neoplasms should be questioned. Allogeneic animals are not appropriate for use as a model system for the study of experimental metastasis. Animals sensitized to a tumor exhibit kinetic patterns of tumor cell arrest and survival that differ from normal syngeneic hosts.
Insights
Host immune status influences initial tumor cell arrest, but this doesn't predict tumor development. Subcutaneous tumor rejection doesn't solely indicate immunity to neoplasms, questioning its use as a sole criterion.
Area of Science:
- Immunology
- Oncology
- Cancer Metastasis Research
Background:
- Investigating the fate of intravenously injected tumor cells is crucial for understanding metastasis.
- Host immune status significantly impacts tumor cell interactions within the body.
- Previous models may not fully capture the complexities of experimental metastasis.
Purpose of the Study:
- To investigate the kinetics of tumor cell arrest, distribution, survival, and fate.
- To determine the influence of host immune status on these processes.
- To evaluate the suitability of different animal models for metastasis studies.
Main Methods:
- Intravenous injection of 125I-iododeoxyuridine-labeled B16 melanoma cells into syngeneic and allogeneic mice.
- Monitoring radioactivity in organs (lungs, liver, spleen) and blood at various time points (2 minutes to 14 days).
- Assessing viable tumor cells based on DNA-associated radioactivity.
Main Results:
- Initial tumor cell arrest is influenced by host immune status but not correlated with survival or tumor development.
- Tumors rejected subcutaneously grew in the lungs after intravenous injection.
- Allogeneic models showed different kinetic patterns compared to syngeneic hosts.
Conclusions:
- Host immune status affects initial tumor cell arrest, but this is not a predictor of tumor outgrowth.
- Relying solely on subcutaneous tumor rejection to assess host immunity to neoplasms is questionable.
- Allogeneic animals are not ideal models for studying experimental metastasis.
