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. 1987 Oct;55(10):2404–2408. doi: 10.1128/iai.55.10.2404-2408.1987

Interaction of soluble fibronectin with group B streptococci.

K M Butler 1, C J Baker 1, M S Edwards 1
PMCID: PMC260721  PMID: 3115897

Abstract

Fibronectin binds to a variety of bacterial species, and we hypothesized that differential fibronectin binding might influence the invasive potential of group B streptococci (GBS). Human plasma fibronectin purified by a standard two-step chromatographic procedure was radiolabeled with 3H. Fifty GBS strains (invasive, colonizing, or bovine) representing serotypes Ia (10 strains), Ib (6 strains), Ia/c (6 strains), II (10 strains), III (11 strains), IV (1 strain), and nontypable (6 strains) were tested. No source or serotype variability was detected among GBS strains, and binding was uniformly less than 1.5% of available fibronectin. Lack of detectable binding occurred at both the log and stationary growth phases and persisted despite treatment with trypsin or neuraminidase or opsonization with immunoglobulin G containing high levels (greater than 40 micrograms/ml) of antibody specific for the Ia, II, or III GBS capsular polysaccharides. Incubation with GBS did not inhibit fibronectin binding to the Cowan 1 strain of Staphylococcus aureus. Strain COH 31-15, an isogenic, type III, capsule-deficient mutant of COH 31r/s, also failed to bind fibronectin. In contrast to other streptococci, GBS do not have readily detectable receptors for soluble fibronectin as part of their surface structures. If present, binding sites for soluble fibronectin are deep to surface structures, obscured from host defense systems, or require the presence of other factors to facilitate their recognition of fibronectin. The uniform ability of GBS to resist binding to soluble fibronectin could be a significant virulence factor in the pathogenesis of invasive infections of infants.

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Selected References

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