Abstract
Human blood mononuclear cells were cultured for 7 days in hydrophobic plastic bags. Macrophages differentiated from monocytes and purified by elutriation were then cocultured with round-shaped aggregates of epithelial cells (spheroids). Spheroids prepared from the SK-MES-1 carcinoma cell line were cultured individually, under constant stirring, in multiwell plates coated with agarose. Macrophage/spheroid interactions were investigated under various experimental conditions. Macrophages activated with interferon γ aggregated to each other and to spheroids, in contrast to control unactivated macrophages. Histological examination, after staining with a macrophage-specific monoclonal antibody, showed that both control and interferon-γ-activated macrophages migrated between epithelial tumor cells and infiltrated the spheroids. The addition of anti-ICAM-1 monoclonal antibody inhibited macrophage homotypic aggregation as well as aggregation to and penetration into spheroids. The macrophages did not exert cytolytic effects, as judged by a chronium-51 release assay, but provoked a diminution of tritiated thymidine incorporation by tumor cells. Cytostatic activity was observed with effector: target ratios as low as 1∶16, and was maximal (99% at a 1∶1 E∶T ratio) with macrophages differentiated in the presence of granulocyte/macrophage-colony-stimulating factor. The cytostatic effect was not related to tumor necrosis factor α secretion.
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Audran, R., Dazord, L. & Toujas, L. Interactions between human macrophages and tumor cells in three-dimensional cultures. Cancer Immunol Immunother 39, 299–304 (1994). https://doi.org/10.1007/BF01519982
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DOI: https://doi.org/10.1007/BF01519982