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[Analysis of the mechanism of cancer metastasis by using anticancer agents]
Abstract:
For the analysis of the mechanism of cancer metastasis, effects of anticancer agents on the NK activity of spleen cells and on the artificial metastasis of B-16 melanoma cells were comparatively studied. The inhibitory effect of these anticancer agents on the growth of B-16 melanoma inoculated to foot pad of C57/BL6 mice was also examined. The growth of B-16 melanoma was inhibited by intravenous administration of 6 mg/kg of MMC, 18 mg/kg of KW-2083 and 5 mg/kg of CDDP, but not of 6 mg/kg of KW-2083. The NK activities in spleen cells of C57/BL6 mice administered with 6 mg/kg of MMC and 18 mg/kg of KW-2083 were decreased, but they were not decreased in mice administered with 6 mg/kg of KW 2083 and 5 mg/kg of CDDP. Significant increases in the number of artificial pulmonary and liver metastasis were observed in mice administered with 6 mg/kg of MMC and 18 mg/kg of KW-2083. It is suggested that the depression of NK activity induced by anticancer agents results in the promotion of metastatic disease.
Insights
Anticancer drugs can promote cancer metastasis by suppressing natural killer (NK) cell activity. This study found that certain chemotherapy agents increased metastasis in mice by reducing NK cell function.
Area of Science:
- Immunology
- Pharmacology
- Oncology
Context:
- Cancer metastasis is a complex process involving the spread of tumor cells. Natural killer (NK) cells play a crucial role in immune surveillance against cancer.
- Understanding the interplay between anticancer agents and the immune system is vital for developing effective cancer therapies.
Purpose:
- To investigate the effects of specific anticancer agents on NK cell activity and B-16 melanoma metastasis in a mouse model.
- To determine if reduced NK cell activity correlates with increased cancer metastasis.
Summary:
- The study examined the impact of mitomycin C (MMC), KW-2083, and cisplatin (CDDP) on B-16 melanoma growth, NK cell activity, and artificial metastasis in C57/BL6 mice.
- MMC and higher-dose KW-2083 inhibited tumor growth but also decreased NK cell activity, leading to increased pulmonary and liver metastasis.
- Lower-dose KW-2083 and CDDP did not significantly affect NK cell activity and showed less impact on metastasis.
Impact:
- The findings suggest that some anticancer agents may inadvertently promote cancer metastasis by suppressing the host's immune response via NK cell activity.
- This highlights the need to consider immunomodulatory effects when selecting and administering chemotherapy drugs.
- Further research into strategies to preserve or enhance NK cell function during cancer treatment is warranted.