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Rat colon carcinoma cells that survived systemic immune surveillance are less sensitive to NK-cell mediated apoptosis
Jurjen H L Velthuis1, Miranda Stitzinger, Remco I J M Aalbers
1Division of Toxicology, Leiden/Amsterdam Center for Drug Research, Leiden University, Leiden, The Netherlands.
Abstract:
In order to form distant metastases, cells from the primary tumor have to detach, enter the blood- or lymph-compartment and escape immune surveillance. Here, we describe the selection of rat colon carcinoma cell lines (CC531s-m1 and CC531s-m2) that escaped from systemic immune surveillance; CC531s cells were injected into the v. jugularis of Wag/Rij rats, after three weeks the lung tumors were isolated, the tumor cells were cultured, characterized and injected again. The m1- and m2-cell lines were less susceptible for killing by syngeneic NK cells. Further characterization of this cell line showed a decreased sensitivity towards TRAIL- and CD95L-, but not to granzyme B-mediated apoptosis. In the m1- and m2-cells log-phase growth started earlier as compared to the parental cell line, whereas no changes were found in anchorage-dependent or anchorage-independent growth. After subcapsular injection of the m2-cell line into the liver of rats much more lung metastases were formed in comparison to injection of the parental cell line. In conclusion, the results suggest that the resistance of the m1- and m2-cells to NK cell-mediated apoptosis was associated with their capability to survive systemic immune surveillance and form metastases in vivo.
Insights
New colon carcinoma cell lines (CC531s-m1 and CC531s-m2) resist immune surveillance. These cells evade natural killer (NK) cell attacks, promoting metastasis formation in vivo.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Distant metastasis formation requires tumor cells to evade immune surveillance.
- Developing strategies to overcome immune evasion is crucial for cancer therapy.
Purpose of the Study:
- To select and characterize colon carcinoma cell lines resistant to immune surveillance.
- To investigate the mechanisms underlying immune evasion and their role in metastasis.
Main Methods:
- Selection of rat colon carcinoma cell lines (CC531s-m1, CC531s-m2) through serial injection and isolation from immune-competent rats.
- Assessment of resistance to natural killer (NK) cell-mediated cytotoxicity, TRAIL-, CD95L-, and granzyme B-induced apoptosis.
- Evaluation of metastatic potential following liver injection in rats.
Main Results:
- The selected CC531s-m1 and CC531s-m2 cell lines exhibited reduced susceptibility to NK cell-mediated killing.
- These cell lines showed decreased sensitivity to TRAIL- and CD95L-induced apoptosis, but not granzyme B.
- Early log-phase growth was observed in m1 and m2 cells compared to parental cells.
- Liver injection of m2 cells resulted in significantly more lung metastases than the parental cell line.
Conclusions:
- Resistance to NK cell-mediated apoptosis is associated with the ability of CC531s-m1 and CC531s-m2 cells to evade systemic immune surveillance.
- These findings highlight the role of immune evasion in metastasis and suggest potential therapeutic targets.
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