Summary
Using batroxobin, a thrombin-like enzyme found in snake venom, the effects of defibrinogenation on artificial lung metastasis in mice were studied. The role of natural killer (NK) cells in the inhibitory effects of defibrinogenation on metastasis was also investigated. Artificial lung metastasis experiments were performed by inoculating either B16-F10 cells or B16-BL/6 cells, highly metastatic strains of B16 melanoma cells, into C57BL/6 mice via the tail vein. The administration of batroxobin significantly inhibited lung metastasis, as did NK activity augmented by poly (I) · poly (C) administration. When both batroxobin and poly (I) · poly (C) were administered, lung metastasis was more markedly inhibited. When NK activity was suppressed by administration of anti-(asialo GM1) antibody, lung metastasis was markedly increased. When batroxobin was administered with anti-(asialo GM1) antibody, no inhibitory effects on lung metastasis, such as those seen with batroxobin alone, were observed. The administration of batroxobin had no effect at all on spleen lymphocyte NK activity. These results indicated that defibrinogenation due to batroxobin inhibits lung metastasis, and these effects depend on NK activity of the host.
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Abbreviations
- NK:
-
natural killer
- BU:
-
batroxobin units
- FCS:
-
fetal calf serum
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Shibuya, M., Niitani, H., Aoyama, A. et al. Antimetastatic effect of defibrinogenation with batroxobin depends on the natural killer activity of host in mice. J Cancer Res Clin Oncol 116, 168–172 (1990). https://doi.org/10.1007/BF01612672
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DOI: https://doi.org/10.1007/BF01612672