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Inhibitory Effect of BCG Cell-Wall Skeletons (BCG-CWS) Emulsified in Squalane on Tumor Growth and Metastasis in Mice  

Yoo, Yung-Choon (Department of Microbiology, College of Medicine, Konyang University)
Hata, Katsusuke (Institute of Immunological Science, Hokkaido University)
Lee, Kyung-Bok (Department of Biochemistry, College of Medicine, Konyang University)
Azuma, Ichiro (Institute of Immunological Science, Hokkaido University, Hokkaido National College of Technology)
Publication Information
Archives of Pharmacal Research / v.25, no.4, 2002 , pp. 522-527 More about this Journal
Abstract
The antimetastatic effect of BCG-CWS, which was emulsified in an oil-in-water form with either Drakeol 6VR mineral oil (BCG-CWS/DK) or squalane (BCG-CWS/SQA), on lung metastasis produced by highly metastatic murine tumor cells, Colon26-M3.1 carcinoma cells and B16-BL6 melanoma cells, was investigated in syngeneic mice. An intravenous (i.v.) administration of BCG-CWS (100 mg/mouse) 1 day after tumor inoculation significantly inhibited tumor metastasis of both Colon26-M3.1 carcinoma and B16-BL6 melanoma cells in experimental lung metastasis models. No differences in the antitumor activity of the two oil-based formulations (BCG-CWS/DK and BCG-CWS/SQA) were obverved. However, BCG-CWS/SQA administered through subcutaneous (s.c.) route was shown to be effective only when it was consecutively injected (3 times) after tumor inoculation. An in vivo analysis for tumor-induced angiogenesis shwed that a single i.v. administration of BCG-CWS/SQA inhibited the number of tumor-induced blood vessels and suppressed tumor growth. Furthermore, the multiple administration of BCG-CWS/SQA given at on week intervals led to a significant reduction in spontaneous lung metastasis of B16-BL6 melanoma cells in a spontaneous metastasis model. These results suggest that BCG-CWS emulsified with squalane is a potent inhibitory agent of lung metastasis, and that the anti metastatic effect of BCG-CWS is related to the suppression of tumor growth and the inhibition of tumor-induced angiogenesis.
Keywords
bcg-CWS; Squalane; Tumor metastasis; Antitumor effect;
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