Antitumor activity of the DNA fraction from Mycobacterium bovis BCG. II. Effects on various syngeneic mouse tumors.
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| Abstract |
MY-1, a fraction extracted from BCG and composed of 70.0% DNA and 28.0% RNA, was examined for its antitumor activity against 9 different syngeneic mouse tumors. Tumor regression was induced in almost all of the mice bearing any of five kinds of solid tumors by repeated intralesional injections of 100 micrograms MY-1. When cells of some tumors were inoculated intradermally together with MY-1, tumor growth was suppressed, lung metastases were inhibited, and the survival times of mice bearing 1 of 3 leukemic tumors were prolonged. Repeated sc injections with MY-1 in sites remote from tumor cell inoculation or repeated iv injections were more or less effective against three kinds of solid tumors. Mice inoculated with Lewis lung carcinoma cells in a hind footpad and whose legs were amputated 9 days later were given iv or sc injections of MY-1 every other day (8 times in total), resulting in substantial prolongation of survival. No direct cytotoxicity of MY-1 for these tumors could be shown in three kinds of experiments, which indicates that the antitumor mechanism of MY-1 is host mediated. MY-1 was equally effective in mice with or without presensitization with BCG, whereas BCG was much more effective in BCG-sensitized mice. This finding suggests that a delayed-type hypersensitivity reaction elicited by BCG protein is not required for the antitumor activity of MY-1.
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| Authors | S Shimada, O Yano, H Inoue, E Kuramoto, T Fukuda, H Yamamoto, T Kataoka, T Tokunaga |
| Journal | Journal of the National Cancer Institute (J Natl Cancer Inst) Vol. 74 Issue 3 Pg. 681-8 (Mar 1985) ISSN: 0027-8874 [Print] United States |
| PMID | 3856070 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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