Abstract
We have previously reported the development of antitumor effector cells by day 12 after tumor implantation using a murine malignant ascites model with BAMC-1 tumor, which could be cured completely by five consecutive i.p. injections of OK-432 starting on day 2. In contrast, the OK-432 treatment with the same protocol failed to cure the tumor-bearing athymic mice, though it could suppress tumor growth temporarily. The results suggest that T cells may play a critical role in achieving a therapeutic effect. The present study was designed to clarify the nature of the antitumor effector cells induced by OK-432 in euthymic mice. The number of tumor cells in the pertioneal cavity of OK-432-treated euthymic mice increased gradually up to day 12 and dropped suddenly on day 14, while in the athymic mice the tumor cells transiently decreased in the first 7 days then started to expand drastically on day 8. The timing of the appearance of the effector cells was examined by adoptive-transfer experiments. The peritoneal exudate cells (PEC) obtained from BAMC-1 bearing euthymic mice on various days during the treatments with OK-432 were passively transferred intraperitoneally on the respective days (synchronous transfer) or on day 7 (convergent transfer) to BAMC-1-bearing athymic mice, which were treated similarly with OK-432. More than 85% of the recipient athymic mice survived when an adoptive transfer was made on and after day 7. These results indicated that the effector cells developed before day 8 in euthymic mice. The effector cells detectable on day 7 in the PEC represent plastic- or nylon-wool-column-nonadherent cells, which could cure the tumor-bearing athymic mice. Furthermore, the effector cells were destroyed when the nylon-wool-column-nonadherent cells were treated with an anti-L3T4 antibody and complement whereas the same treatment with anti-Lyt2 antibody had no effect. These L3T4+ cells did not possess asialo-GM1 antigen. Although the exact mechanism of action of the effector cells is yet to be clarified, the induction of human equivalents of this type of effector cell would be a good parameter indicative of clinical effects induced by OK-432 or other biological response modifiers in an individual cancer patient.
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Moriya, Y., Sato, H., Ito, K. et al. Induction of antitumor L3T4-positive T cells by OK-432 at tumor sites in mice. Cancer Immunol Immunother 36, 245–250 (1993). https://doi.org/10.1007/BF01740906
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DOI: https://doi.org/10.1007/BF01740906