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Abrogation of hematogenous metastases in a murine model by natural killer cells
Abstract:
Natural killer (NK) cells are hypothesized to provide resistance against tumors in vivo. The NK system was examined in vivo by the hematogenous dissemination of a murine melanoma in normal C57BL/6 mice (control, athymic homozygous Balb-C nude mice (with increased NK cells), and C57BL/6 beige mice (with decreased NK cells). The highly metastatic F10 subline of the B16 melanoma was maintained in tissue culture to assure high NK sensitivity of the cells. Aliquots of B16-F10 cells in NaCl were injected into the tail vein of 6- to 8-week-old normal mice, nude mice, and beige mice. The mice were killed at 2 weeks and pulmonary nodules were counted under the dissecting microscope. Nude mice were highly resistant to metastases, even at overwhelming doses. Beige mice, however, developed significantly increased numbers of metastases at low doses as compared with control mice (p less than 0.001). We conclude that NK cells serve an important function in the control of tumor metastasis in this in vivo animal preparation. Further investigation of modulation of the NK system in this preparation may elucidate benefits for the treatment of cancer in man.
Insights
Natural killer (NK) cells are crucial for controlling tumor metastasis. Studies show that mice with increased NK cells resisted melanoma spread, while those with decreased NK cells had more metastases.
Area of Science:
- Immunology
- Oncology
- Cancer Research
Background:
- Natural killer (NK) cells are implicated in anti-tumor immunity.
- The role of NK cells in controlling cancer metastasis requires further in vivo investigation.
Purpose of the Study:
- To investigate the in vivo function of the NK system in controlling hematogenous tumor metastasis.
- To evaluate the impact of varying NK cell levels on melanoma dissemination and metastasis.
Main Methods:
- Hematogenous dissemination of B16-F10 melanoma cells was studied in three mouse models: normal C57BL/6, athymic Balb-C nude (high NK), and C57BL/6 beige (low NK).
- Pulmonary metastases were quantified two weeks post-intravenous injection of melanoma cells.
Main Results:
- Athymic nude mice exhibited high resistance to melanoma metastases, even at high cell doses.
- Beige mice demonstrated a significant increase in pulmonary metastases compared to control mice, particularly at lower doses (p < 0.001).
Conclusions:
- NK cells play a significant role in controlling tumor metastasis in this in vivo model.
- Modulating the NK system holds potential for developing novel cancer治疗 strategies.