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• W2140454611 abstract "Streptococcus pneumoniae is a major cause of morbidity and mortality worldwide. Its polysaccharide capsule causes resistance to phagocytosis and interferes with the innate immune system's ability to clear infections at an early stage. Nevertheless, we found that encapsulated pneumococci are sensitive to killing by a human neutrophil granule extract. We fractionated the extract by high-performance liquid chromatography and identified alpha-defensins by mass spectrometry as the proteins responsible for killing pneumococci. Analysis of sensitivity to the commercial alpha-defensins human neutrophil proteins 1 to 3 (HNP1-3) confirmed these findings. We analyzed the sensitivities of different pneumococcal strains to HNP1-3 and found that encapsulated strains are efficiently killed at physiological concentrations (7.5 microg/ml). Surprisingly, nonencapsulated, nonvirulent pneumococci were significantly less sensitive to alpha-defensins. The proposed mechanisms of alpha-defensin resistance in nonencapsulated pneumococci is surface charge modification, e.g., by introduction of positive charge by D-alanylation of surface-exposed lipoteichoic acids. These mechanisms are surmounted by the presence of the capsule, which we hypothesize is masking these charge modifications. Hence, alpha-defensins in the phagolysosome of neutrophils possibly contribute to intracellular killing after antibody-mediated opsonophagocytosis of encapsulated pneumococci." @default.
• W2140454611 created "2016-06-24" @default.
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• W2140454611 date "2008-08-01" @default.
• W2140454611 modified "2023-10-03" @default.
• W2140454611 title "The Capsule Sensitizes <i>Streptococcus pneumoniae</i> to α-Defensins Human Neutrophil Proteins 1 to 3" @default.
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• W2140454611 doi "https://doi.org/10.1128/iai.01748-07" @default.
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