Abstract
The interaction between Fas and Fas ligand (FasL) is involved in the apoptotic death of a number of cells including lymphocytes. Forced expression of FasL in tumors can induce apoptosis of infiltrating Fas-positive T cells; accordingly, tumors can survive in the milieu of systemic immune responses. However, FasL-expressing murine lung carcinoma (A11) and melanoma (B16) cells did not develop subcutaneous tumors and FasL-expressing A11 (A11/FasL) cells produced few spontaneous lung metastatic foci in syngeneic mice. The mice that rejected A11/FasL cells were resistant to subsequent challenge of parent A11 but not irrelevant B16 cells. Vaccination of mice with UV-treated A11/FasL, but not UV-treated A11 cells, however, augmented the growth rate of A11 but not B16 tumors, both of which were subsequently inoculated. The number of lung metastatic foci of A11 cells was also increased in the mice that received UV-treated A11/FasL but not UV-treated A11 cells. Intraperitoneal injection of UV-treated A11/FasL cells resulted in the production of larger amounts of immunosuppressive TGF-β in peritoneal exudate than that of UV-treated A11 cells. Expression of the CD80 costimulatory molecule in tissues where UV-treated A11/FasL cells were inoculated was lower than the expression at an untreated A11/FasL–injected site. Our results indicated that apoptotic FasL-expressing tumor cells could impair host immune responses against the tumors, in contrast to potent antitumor immunity generated by viable FasL-expressing tumors.
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This work was supported by a grant-in-aid for scientific research from the Japan Society for the Promotion of Science and a grant-in-aid for scientific research on priority areas from the Minister of Education, Culture, Sports, Science, and Technology of Japan.
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Tada, Y., O-Wang, J., Wada, A. et al. Fas ligand-expressing tumors induce tumor-specific protective immunity in the inoculated hosts but vaccination with the apoptotic tumors suppresses antitumor immunity. Cancer Gene Ther 10, 134–140 (2003). https://doi.org/10.1038/sj.cgt.7700545
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DOI: https://doi.org/10.1038/sj.cgt.7700545
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