Gamma-irradiation facilitates the expression of adoptive immunity against established tumors by eliminating suppressor T cells - PubMed (original) (raw)

Gamma-irradiation facilitates the expression of adoptive immunity against established tumors by eliminating suppressor T cells

R J North. Cancer Immunol Immunother. 1984.

Abstract

It was found that sublethal (550 rad) whole-body gamma-irradiation of mice bearing established immunogenic tumors enabled tumor-sensitized spleen cells infused intravenously 1 h later to cause complete tumor regression in all mice. In contrast, gamma-irradiation alone caused only a temporary halt in tumor growth, and immune cells gave practically no therapeutic effect at all. This result was obtained with the SA1 sarcoma, Meth A fibrosarcoma, P815 mastocytoma, and P388 lymphoma. Additional experiments with the Meth A fibrosarcoma revealed that the spleen cells from tumor-immune donors that caused tumor regression in gamma-irradiated recipients were T cells, as evidenced by their functional elimination by treatment with anti-Thy-1.2 antibody and complement. It was shown next that adoptive T-cell-mediated regression of tumors in gamma-irradiated recipients was inhibited by an intravenous infusion of spleen cells from donors with established tumors, but not by spleen cells from normal donors. The spleen cells that suppressed the expression of adoptive immunity were functionally eliminated by treatment with anti-Thy-1.2 antibody and complement. Moreover, they were destroyed by exposing the tumor-bearing donors to 500 rad of gamma-radiation 24 h before harvesting their spleen cells. The results are consistent with the interpretation that gamma-radiation facilitates the expression of adoptive T-cell-mediated immunity against established tumors by eliminating a population of tumor-induced suppressor T cells from the tumor-bearing recipient.

PubMed Disclaimer

References

    1. Berendt MJ, North RJ. T cell-mediated suppression of antitumor immunity. An explanation for progressive growth of an immunogenic tumor. J Exp Med. 1980;151:69. - PMC - PubMed
    1. Dye ES, North RJ. T cell-mediated immunosuppression as an obstacle to adoptive immunotherapy of the P815 mastocytoma and its metastases. J Exp Med. 1981;154:251. - PMC - PubMed
    1. Dye ES, North RJ (1983) Specificity of the T cells that express and suppress adoptive immunotherapy of established tumors. J Reticuloendothel Soc (in press) - PubMed
    1. Dye ES, North RJ, Mills CD. Mechanisms of antitumor action of Corynebacterium parvum. 1. Potentiated tumor-specific immunity and its therapeutic limitations. J Exp Med. 1981;154:609. - PMC - PubMed
    1. Eberlein TJ, Rosenstein M, Rosenberg SA. Regression of a disseminated syngeneic solid tumor by systemic transfer of lymphoid cells expanded in interleukin 2. J Exp Med. 1982;156:385. - PMC - PubMed

Publication types

MeSH terms

Substances

LinkOut - more resources