The Journal of Immunology, Vol 153, Issue 10 4604-4615, Copyright © 1994 by American Association of Immunologists

ARTICLES

IFN-alpha 1 gene expression into a metastatic murine adenocarcinoma (TS/A) results in CD8+ T cell-mediated tumor rejection and development of antitumor immunity. Comparative studies with IFN-gamma-producing TS/A cells

M Ferrantini, M Giovarelli, A Modesti, P Musiani, A Modica, M Venditti, E Peretti, PL Lollini, P Nanni and G Forni
Laboratory of Virology, Higher Institute of Health, Rome, Italy.

Cells from a spontaneous, invasive, and metastasizing mouse mammary adenocarcinoma (TS/A-pc) were transfected with a retroviral vector containing the mouse IFN-alpha 1 gene. TS/A clones secreting varying amounts of IFN-alpha 1 were isolated and their tumorigenicity was evaluated after s.c. or i.v. injection into immunocompetent BALB/c mice. Almost all of the IFN-alpha-secreting TS/A clones failed to grow in a high percentage of mice or formed small tumors after a long latency time, whereas TS/A-pc or transfection control cells always grew into large s.c. tumors. Rejection was mainly mediated by CD8+ T lymphocytes and partially by polymorphonuclear cells, as demonstrated by selective immunosuppression experiments and histologic and ultrastructural data. After rejection, a significant portion of mice displayed an immune resistance to the subsequent challenge with TS/A- pc. When the metastatic ability of IFN-alpha-secreting clones was compared with that of previously characterized IFN-gamma-secreting TS/A clones, it was found that the expression of IFN-alpha into TS/A tumor cells resulted in a potent inhibition of metastases formation, whereas IFN-gamma expression either did not affect or even enhanced the metastatic behavior of TS/A cells. These results provide strong evidence for the usefulness of IFN-alpha-producing tumor cells for the development of gene therapy strategies and vaccines against metastatic tumors.

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