Summary
The characteristics of the binding of human monocytes to tumor cells were studied by a newly developed microassay. First, we determined the kinetics and optimal conditions of the binding. Monocytes recognized and bound to tumor cells very rapidly within 10–20 min of cellular interaction. Binding was also more efficient at 37°C suggesting that active metabolism of monocytes is required. Second, we determined that selective binding of monocytes to cells with tumorigenic phenotypes occurs. For this purpose, lymphocytic leukemia cell lines versus normal lymphocytes, and tumorigenic versus nontumorigenic hybrids from the same parental lines were compared as the targets of the binding assay. In both cases, neoplastic cells were selectively bound by monocytes. Although tumor cells were bound rapidly and selectively by monocytes, initial recognition and binding did not necessarily lead to subsequent tumor cell lysis. This is based on the observation that some tumorigenic parental and hybrid lines were avidly bound by monocytes yet not subsequently killed in a cytotoxicity assay.
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This work was supported in part by a grant from the National Institutes of Health CA42992 and a grant from the Kleberg foundation
Abbreviations used: [125I]IdUrd [125I]iododeoxyuridine; rIFN-γ, recombinant human interferon γ; IL-1, interleukin 1; rTNF, recombinant human tumor necrosis factor
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Shimizu, H., Wyatt, D., Knowles, R.D. et al. Human monocytes selectively bind to cells expressing the tumorigenic phenotype. Cancer Immunol Immunother 28, 185–192 (1989). https://doi.org/10.1007/BF00204987
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DOI: https://doi.org/10.1007/BF00204987