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Poly-N-Acetylglucosamine Production by Staphylococcus epidermidis Cells Increases Their In Vivo Proinflammatory Effect

Title
Poly-N-Acetylglucosamine Production by Staphylococcus epidermidis Cells Increases Their In Vivo Proinflammatory Effect
Type
Article in International Scientific Journal
Year
2016-09-19
Authors
Pedro Ferreirinha
(Author)
ICBAS
Begoña Pérez-Cabezas
(Author)
Other
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Bruna Myiazawa
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Angela França
(Author)
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Virgínia Carvalhais
(Author)
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Augusto Faustino
(Author)
ICBAS
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Anabela Cordeiro-da-Silva
(Author)
FFUP
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Gerald B. Pier
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Nuno Cerca
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Manuel Vilanova
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ICBAS
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Journal
Vol. 84
Pages: 2933-2943
ISSN: 0019-9567
Indexing
Publicação em ISI Web of Science ISI Web of Science
Pubmed / Medline
Scientific classification
FOS: Medical and Health sciences > Basic medicine
CORDIS: Health sciences > Medical sciences > Medicine > Immunology
Other information
Authenticus ID: P-00M-3ZN
Abstract (EN): Poly-N-acetylglucosamine (PNAG) is a major component of the Staphylococcus epidermidis biofilm extracellular matrix. However, it is not yet clear how this polysaccharide impacts the host immune response and infection-associated pathology. Faster neutrophil recruitment and bacterial clearance were observed in mice challenged intraperitoneally with S. epidermidis biofilm cells of the PNAG-producing 9142 strain than in mice similarly challenged with the isogenic PNAG-defective M 10 mutant. Moreover, intraperitoneal priming with 9142 cells exacerbated liver inflammatory pathology induced by a subsequent intravenous S. epidermidis challenge, compared to priming with M 10 cells. The 9142-primed mice had elevated splenic CD4(+)T cells producing gamma interferon and interleukin-17A, indicating that PNAG promoted cell-mediated immunity. Curiously, despite having more marked liver tissue pathology, 9142-primed mice also had splenic T regulatory cells with greater suppressive activity than those of their M 10-primed counterparts. By showing that PNAG production by S. epidermidis biofilm cells exacerbates host inflammatory pathology, these results together suggest that this polysaccharide contributes to the clinical features associated with biofilm-derived infections.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 11
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