Summary
The effect of a bovine milk protein, lactoferrin (bLf), and a pepsin-generated peptide of bLf, lactoferricin (Lfcin-B), on inhibition of tumor metastasis produced by highly metastatic murine tumor cells, B16-BL6 melanoma and L5178Y-ML25 lymphoma cells, was examined in experimental and spontaneous metastasis models using syngeneic mice. The subcutaneous (s.c.) administration of bovine apo-lactoferrin (apo-bLf) and Lfcin-B 1 day after tumor inoculation significantly inhibited liver and spleen metastasis of L5178Y-ML25 cells and lung metastasis of B16-BL6 cells, whereas human apo-lactoferrin (apo-hLf) and bovine holo-lactoferrin (holo-Lf) at the dose of 1 mg/mouse did not. Furthermore, both apobLf and Lfcin-B, but not apo-hLf and holo-bLf, inhibited the number of tumor-induced blood vessels and suppressed tumor growth on day 8 after tumor inoculations in an in vivo model. However, in a long-term analysis of tumor growth for up to 21 days after tumor inoculation, single administration of apo-bLf significantly suppressed the growth of B 16-BL6 cells throughout the examination period, but Lfcin-B showed inhibitory activity only during the early period (8 days). In spontaneous metastasis model, multiple administration of both apo-bLf and Lfcin-B significantly inhibited lung metastasis of B16-BL6 cells, however it was only apo-bLf that exhibited the inhibitory effect of tumor growth at the time of primary tumor amputation (on day 21) after tumor inoculation. The results suggest that apo-bLf and Lfcin-B inhibit tumor metastasis through different mechanisms, and that the inhibitory activity of bLf on tumor metastasis maybe related to the property of iron (Fe3+)-saturation.
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Yoo, YC., Watanabe, S., Watanabe, R., Hata, K., Shimazaki, Ki., Azuma, I. (1998). Bovine Lactoferrin and LactoferricinTM Inhibit Tumor Metastasis in Mice. In: Spik, G., Legrand, D., Mazurier, J., Pierce, A., Perraudin, JP. (eds) Advances in Lactoferrin Research. Advances in Experimental Medicine and Biology, vol 443. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9068-9_35
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DOI: https://doi.org/10.1007/978-1-4757-9068-9_35
Publisher Name: Springer, Boston, MA
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