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Updated: Aug 8, 2026
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Standardized In vitro Assays to Visualize and Quantify Interactions between Human Neutrophils and Staphylococcus aureus Biofilms
Published on: June 8, 2022
Extracellular membrane vesicles-previously unrecognized components of Staphylococcus aureus biofilms
Jinger Lei1,2, Misaki Foster1,2, Emery Ng3
1Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.
Journal of Bacteriology
|August 7, 2026
Summary
Staphylococcus aureus biofilms utilize membrane vesicles (MVs) to deliver essential matrix components, aiding in biofilm formation and integrity. These biofilm-derived MVs are crucial for restoring disrupted biofilms, highlighting their role in pathogenesis.
Area of Science:
- Microbiology
- Bacterial Pathogenesis
- Biofilm Formation
Background:
- Staphylococcus aureus is a major cause of biofilm-associated infections.
- Biofilm matrix components are crucial for bacterial survival but their release mechanisms are unclear.
- Membrane vesicles (MVs) are known mediators of intercellular communication in bacteria.
Purpose of the Study:
- To investigate the role of MVs in Staphylococcus aureus biofilm formation.
- To characterize MVs derived from S. aureus biofilms.
- To determine the contribution of MVs to the biofilm matrix composition and structural integrity.
Main Methods:
- Utilized a drip-flow biofilm system to culture S. aureus.
- Purified and characterized MVs from biofilm and planktonic cultures.
- Performed proteomic analysis of MVs and biofilm matrix.
- Assessed the impact of enzyme treatments (DNase, proteinase K) and MV supplementation on biofilm formation.
Main Results:
- Biofilm-derived MVs were associated with the S. aureus biofilm matrix.
- Proteomic analysis revealed MVs carried matrix-like proteins and significantly more DNA than planktonic MVs.
- Biofilm-derived MVs, but not planktonic MVs, restored biofilm formation in enzyme-disrupted cultures.
Conclusions:
- S. aureus MVs are generated within biofilms and act as carriers of essential matrix components.
- These MVs contribute significantly to biofilm formation and structural integrity.
- This study reveals a novel mechanism of S. aureus biofilm development mediated by MVs in gram-positive bacteria.
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