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Suppression of antitumor immunity by macrophages in spleens of mice bearing a large MOPC-315 tumor

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Summary

We had shown previously that progression of MOPC-315 plasmacytoma growth is associated with an increase in the percentage of macrophages in the spleen as well as a decrease in the ability of tumor-bearer spleen cells to mount an antitumor cytotoxic response upon in vitro immunization. Here we provide evidence that macrophages in the MOPC-315 tumor-bearer spleen are responsible at least in part for the suppression of the generation of antitumor cytotoxicity. Accordingly, removal of most macrophages by depletion of phagocytic cells or Sephadex G-10-adherent cells from spleens of mice bearing a large tumor resulted in augmented antitumor immune potential. Also, Sephadex G-10-adherent spleen cells from tumor-bearing (but not normal) mice drastically suppressed the in vitro generation of antitumor cytotoxicity by normal spleen cells. The suppressive activity of these adherent cells did not reside in contaminating suppressor T cells, since it was not reduced by treatment with monoclonal anti-Thy 1.2 antibody plus complement. The Sephadex G-10-adherent cell population from the tumor-bearer spleen suppressed the in vitro generation of antitumor cytotoxicity against autochthonous tumor cells but not against allogeneic EL4 tumor cells, and hence the suppression was apparently specific. The suppressive activity of the Sephadex G-10-adherent cell population from tumor-bearer spleens was overcome by treatment of the tumor-bearing mice with a low curative dose of cyclophosphamide. This immunomodulatory effect of a low dose of the drug in overcoming the suppression mediated by the Sephadex G-10-adherent cell population enables the effector arm of the immune system of tumor-bearing mice to cooperate effectively with the drug's tumoricidal activity in tumor eradication.

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Authors and Affiliations

  1. Department of Microbiology and Immunology, University of Illinois at Chicago, Health Sciences Center, 60612, Chicago, Illinois, USA

    Qing-Wei Ye, Margalit B. Mokyr, Joseph M. Pyle & Sheldon Dray

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  1. Qing-Wei Ye
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  2. Margalit B. Mokyr
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  3. Joseph M. Pyle
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  4. Sheldon Dray
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Ye, QW., Mokyr, M.B., Pyle, J.M. et al. Suppression of antitumor immunity by macrophages in spleens of mice bearing a large MOPC-315 tumor. Cancer Immunol Immunother 16, 162–169 (1984). https://doi.org/10.1007/BF00205423

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  • DOI: https://doi.org/10.1007/BF00205423

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