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• W2097643107 endingPage "1983" @default.
• W2097643107 startingPage "1978" @default.
• W2097643107 abstract "Antibody to the polysaccharide capsule of type III group B streptococci (GBS) and complement are essential to host defense against systemic infection in neonates. Interactions between C3 degradation products and specific neutrophil receptors mediate the attachment and ingestion of these organisms. To evaluate the influence of capsule on C3 disposition, we compared the C3 fragments released from a highly encapsulated clinical isolate (M861) with those from an unencapsulated mutant (COH 31-15) and an asialo mutant (COH 31-21) of type III GBS after opsonization with hypogammaglobulinemic serum. Upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western blot (immunoblot) analysis, the three strains displayed similar patterns of C3 degradation; both C3b and iC3b were detectable. However, as the duration of opsonization increased, C3 fragment bands became more prominent on the encapsulated strain. The capsule, and specifically sialylation of the capsular polysaccharide of type III GBS, promotes C3 fragment deposition. However, C3 was deposited and degraded to iC3b in the absence of capsule. Opsonization of strain M861 with serum containing antibody specific for the polysaccharide capsule facilitated C3 fragment deposition in the early phases of opsonization. Because iC3b is one of the C3 fragments on an encapsulated strain of type III GBS, the relative deficiency of neonatal neutrophil receptors for this ligand may contribute to the virulence of this organism. Sufficient concentrations of antibody may enhance opsonization by facilitating C3 deposition as well as by interacting with Fc receptors on neutrophils." @default.
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• W2097643107 date "1991-06-01" @default.
• W2097643107 modified "2023-10-16" @default.
• W2097643107 title "Deposition and degradation of C3 on type III group B streptococci" @default.
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• W2097643107 doi "https://doi.org/10.1128/iai.59.6.1978-1983.1991" @default.
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