Summary
Previously reported differences between the cytostatic activity of human peripheral blood monocytes (PBM) and bronchoalveolar macrophages (BAM) for cultured human lung tumor cells have been further investigated. The differences are both quantitative and qualitative and are shown not to be due to the respective methods of purification. There was a varying contribution of cytolysis to the cytostasis detected by the 75selenomethionine post-labeling assay used. Bronchoalveolar macrophages were cytolytic when tested at both low and high E: T ratios but PBM were only cytolytic at the low E: T ratio. A variable dependence upon soluble cytostatic factor(s) was suggested, and there was evidence of heterogeneity in the factors released by the two populations. Cytostatic factor production by both populations appeared to be under similar regulatory constraints. In vitro maturation of PBM altered their cytostatic dose-response curve to one resembling that previously reported for BAM. It was also shown that sera from poor-prognosis lung tumor patients, which suppressed the in vitro maturation of PBM, also suppressed the in vitro cytostatic activity of PBM for cultured human lung tumor cells.
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Swinburne, S., Moore, M. & Cole, P. Further studies on the differences in cytotoxicity of human peripheral blood monocytes and bronchoalveolar macrophages for cultured human lung cells. Cancer Immunol Immunother 19, 62–67 (1985). https://doi.org/10.1007/BF00199314
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DOI: https://doi.org/10.1007/BF00199314