title: Biofilm formation, icaADBC transcription, and polysaccharide intercellular adhesin synthesis by staphylococci in a device-related infection model.
abstract: Biofilm formation of Staphylococcus epidermidis and S. aureus is mediated by the polysaccharide intercellular adhesin (PIA) encoded by the ica operon. We used a device-related animal model to investigate biofilm formation, PIA expression (immunofluorescence), and ica transcription (quantitative transcript analysis) throughout the course of infection by using two prototypic S. aureus strains and one S. epidermidis strain as well as corresponding ica mutants. During infection, the ica mutants were growth attenuated when inoculated in competition with the corresponding wild-type strains but not when grown singly. A typical biofilm was observed at the late course of infection. Only in S. aureus RN6390, not in S. aureus Newman, were PIA and ica-specific transcripts detectable after anaerobic growth in vitro. However, both S. aureus strains were PIA positive in vivo by day 8 of infection. ica transcription preceded PIA expression and biofilm formation in vivo. In S. epidermidis, both PIA and ica expression levels were elevated compared to those in the S. aureus strains in vitro as well as in vivo and were detectable throughout the course of infection. In conclusion, in S. aureus, PIA expression is dependent on the genetic background of the strain as well as on strong inducing conditions, such as those dominating in vivo. In S. epidermidis, PIA expression is elevated and less vulnerable to environmental conditions.
authors.affiliation: Division of Infectious Diseases and Department of Research, University Hospital, Basel, Switzerland.
authors.forename: Ursula
authors.initials: U
authors.lastname: Fluckiger
authors.forename: Martina
authors.initials: M
authors.lastname: Ulrich
authors.forename: Andrea
authors.initials: A
authors.lastname: Steinhuber
authors.forename: Gerd
authors.initials: G
authors.lastname: Döring
authors.forename: Dietrich
authors.initials: D
authors.lastname: Mack
authors.forename: Regine
authors.initials: R
authors.lastname: Landmann
authors.forename: Christiane
authors.initials: C
authors.lastname: Goerke
authors.forename: Christiane
authors.initials: C
authors.lastname: Wolz
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics / Q000378:metabolism; D000581:Amidohydrolases / Q000235:genetics / Q000378:metabolism; D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D018441:Biofilms / Q000254:growth & development*; D004195:Disease Models, Animal; D006168:Guinea Pigs; D006801:Humans; D051379:Mice; D009876:Operon; D011135:Polysaccharides, Bacterial / Q000235:genetics / Q000378:metabolism*; D016459:Prosthesis-Related Infections / Q000382:microbiology* / Q000503:physiopathology; D013203:Staphylococcal Infections / Q000382:microbiology* / Q000503:physiopathology; D013211:Staphylococcus aureus / Q000254:growth & development / Q000472:pathogenicity*; D013212:Staphylococcus epidermidis / Q000254:growth & development / Q000472:pathogenicity*; D014158:Transcription, Genetic
chemical_list: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins; D011135:Polysaccharides, Bacterial; C113579:polysaccharide intercellular adhesin; D000581:Amidohydrolases; C497363:poly-N-acetylglucosamine deacetylase
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