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Immunogenicity of viable tumor cells

A comparison of xenogenized tumor cells and BCG-tumor cell mixtures

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Summary

The immunogenicity of KMT-17 fibrosarcoma cells which had been xenogenized by infection with FV was compared to that of KMT-17 cells which had been admixed with BCG. We report here that 105 and 106 KMT-17 cells also grew progressively to kill rats, but when 105 KMT-17 cells were administered with BCG the tumor cells did not grow in the majority of rats. The strength of immunogenicity (ETD50), as measured by the number of immunizing cells required for a suppression of growth of 107 KMT-17 cells in 50% of the rats, was 2.1×103 for FV-KMT-17 and 36.3×103 for BCG+KMT-17. The tumor cell dose (LTD50) which was required to kill 50% of the rats immunized with 105 FV-KMT-17 was more than 10,000 times higher than that found in normal rats, whereas the number of tumor cells required to kill 50% of the rats immunized with the same number of BCG+KMT-17 was only 3,680 times higher than the amount found in normal rats. Thus the immunogenicity of FV-KMT-17 is much stronger than that of BCG+KMT-17.

The difference in immunogenicity between the two vaccines was also observed in the tumor-neutralizing activities of spleen cells obtained from rats which had been immunized with both vaccines, as measured by a Winn assay. Moreover, the antitumor activity of spleen cells from rats immunized with FV-KMT-17 was concentrated in the carrageenan-resistant and plastic nonadherent cells, while that of spleen cells from rats immunized with BCG+KMT-17 was observed in carrageenan-sensitive and plastic adherent cells as well as in nonadherent cells. The involvement of different effector cells indicates that different mechanisms operate in the antitumor resistance in rats immunized with either FV-KMT-17 or BCG+KMT-17.

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Authors and Affiliations

  1. Laboratory of Pathology, Cancer Institute, Hokkaido University School of Medicine, Kita-15, Nishi-7, Kita-ku, 060, Sapporo, Japan

    Yasuhiro Suzuki, Kazufumi Suzuki, Masuo Hosokawa & Hiroshi Kobayashi

Authors
  1. Yasuhiro Suzuki
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  2. Kazufumi Suzuki
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  3. Masuo Hosokawa
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  4. Hiroshi Kobayashi
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Abbreviations used: FV, Friend leukemia virus; FV-KMT-17, Friend leukemia virus infected KMT-17 cells; EDT50, a 50% effective tumor dose; LTD50, a 50% lethal tumor dose

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Suzuki, Y., Suzuki, K., Hosokawa, M. et al. Immunogenicity of viable tumor cells. Cancer Immunol Immunother 22, 204–210 (1986). https://doi.org/10.1007/BF00200034

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