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A periodate-sensitive anti-phagocytic surface structure, induced by growth in milk whey, on Staphylococcus aureus isolated from bovine mastitis



A periodate-sensitive anti-phagocytic surface structure, induced by growth in milk whey, on Staphylococcus aureus isolated from bovine mastitis



Microbial Pathogenesis 11(3): 211-220



The phagocytic and chemiluminescent activity of purified bovine neutrophils in response to two Staphylococcus aureus strains isolated from mastitic bovine milk and grown in milk whey was studied. The activity was significantly reduced compared with the response elicited by the same strains grown in tryptic soy broth (TSB). A mild periodate treatment of the milk whey-grown strains resulted in a significant increase of both chemiluminescence and phagocytosis, whereas trypsin, subtilisin or papain treatment had no effect. The decreased binding of complement factor C3 to milk-whey-grown bacteria was restored to the level of TSB-grown homologous organisms by periodate treatment. Moreover, this treatment, but not treatment with trypsin, increased the surface hydrophobicity of milk-whey-grown bacteria. The chemiluminescent activity was as high towards heat-killed as towards live bacteria. Also, incubation of heat-killed TSB-grown bacteria in milk whey did not alter the chemiluminescent response, indicating that the reduced neutrophil activity towards milk-whey-grown bacteria was not due to binding of milk components to the microorganisms. These results strongly suggest that bovine mastitis S. aureus strains grown in milk whey produce an anti-phagocytic surface structure. This structure is heat- and protease-resistant and renders the bacterial surface hydrophilic. The anti-phagocytic material is altered or, more likely, released from the bacterial surface on periodate treatment and is probably of carbohydrate nature.

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Accession: 039095025

Download citation: RISBibTeXText

PMID: 1666171

DOI: 10.1016/0882-4010(91)90051-b


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