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- W1978107689 abstract "This investigation examined the effects of heat-labile serum substances on the suppression of yeast phagocytosis in dexamethasone-treated cultures of murine resident peritoneal macrophages. When 4-6 day old untreated control cultures were supplemented with either heat-inactivated (56 degrees C, 30 min) or intact (non-heat-inactivated) fetal bovine serum, more than 90% of the macrophage population ingested at least 1 yeast particle during 15 min phagocytosis assays. In cultures treated with 10(-6) M dexamethasone, approximately 30% of the macrophages were phagocytic. In contrast, approximately 70% of the steroid-treated population consisted of phagocytes in cultures supplemented with intact serum. Medium shift experiments demonstrated that the type of serum present during the 15 min yeast phagocytosis assays, but not the 4-6 day incubation periods, determined the size of the phagocytic subpopulations in the treated cultures. Whereas the majority of control phagocytes ingested more than 8 yeast particles, most dexamethasone-treated phagocytes ingested far fewer than 8 particles regardless of the size of the phagocytic subpopulations. In contrast to yeast, the ingestion of latex particles was inhibited to the same extent in dexamethasone-treated cultures that contained either heat-inactivated or intact serum. Thus, dexamethasone action impairs the ability of macrophages to accumulate yeast particles even though the phagocytic subpopulation is larger in treated cultures containing intact serum. This larger subpopulation may result from the activation of the alternative complement pathway by yeast during phagocytosis." @default.
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- W1978107689 date "1983-01-01" @default.
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- W1978107689 title "Modulatory effects of heat-labile serum components on the inhibition of phagocytosis by dexamethasone in peritoneal macrophage cultures" @default.
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- W1978107689 doi "https://doi.org/10.1016/0192-0561(83)90028-0" @default.
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