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Standardized In vitro Assays to Visualize and Quantify Interactions between Human Neutrophils and Staphylococcus aureus Biofilms
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Complement c5a generation by staphylococcal biofilms.

Ashley E Satorius1, Jacob Szafranski, Derek Pyne

  • 1Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan 48109, USA.

Shock (Augusta, Ga.)
|March 6, 2013
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Staphylococcus epidermidis biofilms on medical devices produce low levels of the immune-activating C5a anaphylatoxin, explaining the muted inflammatory response in central line-associated bloodstream infections.

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Area of Science:

  • Microbiology
  • Immunology
  • Biomedical Engineering

Background:

  • Biofilm production by Staphylococcus epidermidis is a key factor in nosocomial infections associated with medical devices.
  • Despite its prevalence, S. epidermidis often elicits a mild host inflammatory response compared to more virulent pathogens.

Purpose of the Study:

  • To investigate how Staphylococcus epidermidis biofilm formation influences the innate immune response.
  • To quantify the release of the complement anaphylatoxin C5a upon interaction with S. epidermidis biofilms.

Main Methods:

  • Studied C5a elaboration by human serum interacting with wild-type and mutant S. epidermidis biofilms (sarA, icaB).
  • Measured C5a release as a function of biofilm surface area, focusing on the role of polysaccharide intercellular adhesin (PIA).
  • Developed a physiologically based pharmacokinetic model to simulate C5a release from infected central venous catheters.

Main Results:

  • C5a release was approximately 1 fmol/cm²/s and directly dependent on the presence of PIA.
  • Computational modeling indicated that C5a levels from a fully colonized catheter would be insufficient to alert circulating leukocytes.
  • Experimental and simulation results align with clinical observations of muted infection signs.

Conclusions:

  • Polysaccharide intercellular adhesin (PIA) is crucial for S. epidermidis's ability to trigger a significant complement-mediated inflammatory response.
  • The low C5a release from S. epidermidis biofilms on central venous catheters explains the often-subtle clinical presentation of associated bloodstream infections.
  • This study integrates experimental and computational approaches to elucidate the immunomodulatory role of biofilms in device-related infections.