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• W2059703166 abstract "To characterize the factors that contribute to the killing of type 3 S. pneumoniae, human neutrophils were obtained from healthy donors and incubated with viable organisms. In contrast to prior observations with other pneumococcal serotypes, killing was not detected when 10(6) colony forming units (cfu) were incubated at 37 degrees C for 2-4 hours with 10(6) neutrophils in the presence of 20-80% fresh autologous serum; further, pneumococcidal activity was not found when preopsonized bacteria and primed neutrophils were employed in the standard assay. However, when the bacterium to cell ratio was reduced to 1:100 and 1:1000, microbicidal action was detected; a 10-fold reduction in the number of viable bacteria was observed when 2 x 10(3) cfu were incubated with 2 x 10(6) neutrophils and 80% autologous serum at 37 degrees C for 4 hours. To assess the effects of serum factors on killing, bactericidal assays were performed in the presence of normal human serum (NHS), heat-inactivated human serum (HIHS) and absorbed human serum (AHS); heating reduced and absorption eliminated the capacity of serum to support killing. Studies performed with mutanolysin, an enzyme that lyses type 3 pneumococci, demonstrated that the effects of HIHS and AHS on bactericidal activity were highly correlated with alterations in the ability of the sera to support phagocytosis. Studies of neutrophil activation revealed changes in the production of superoxide anion that correlated well with phagocytosis and killing; however, the results of assays of leukotriene B4 generation and degranulation (beta-glucuronidase and lactoferrin release) were more variable. In mixing experiments, the capacity of HIHS to support killing was normalized with NHS; however, the ability of AHS to promote killing was not restored with HIHS or NHS. Thus, these studies demonstrate the relatively limited capacity of human serum to support the killing of type 3 pneumococci, and they emphasize the importance of killing assays in assessing interactions between the bacterium and neutrophils." @default.
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• W2059703166 date "1990-01-01" @default.
• W2059703166 modified "2023-09-24" @default.
• W2059703166 title "An assessment of the factors contributing to the killing of type 3 <i>Streptococcus pneumoniae</i> by human polymorphonuclear leukocytes <i>in vitro</i>" @default.
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• W2059703166 doi "https://doi.org/10.1111/j.1699-0463.1990.tb01009.x" @default.
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