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Updated: Dec 15, 2025
Introducing Shear Stress in the Study of Bacterial Adhesion
Published on: September 2, 2011
Strong Shear Flow Persister Bacteria Resist Mechanical Washings on the Surfaces of Various Polymer Materials
Rongrong Zhang1, Aiguo Xia1, Lei Ni1
1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China.
Abstract:
Environmental bacteria persistently exist in hospitals and thereby often contaminate biomedical devices, which usually causes device-associated infections that have become a major cause of patient illness and death in the hospital. In this study, for the first time, the identification of strong shear flow persister (SSP) cells in Pseudomonas aeruginosa is reported. Unlike common persister cells that are highly tolerant to antibiotics, it is reported that the SSP cells can resist mechanical washings on the surfaces of various polymer materials and can form distinctive biofilms that are tolerant to high doses of aminoglycoside antibiotics. Most importantly, a general molecular mechanism is revealed by which an outer membrane protein crosslinks with polysaccharides to form gel-like adhesion complexes that can exert extremely strong adhesion strength (up to 50 N mm-2 ). Therefore, these findings are urgently required for ongoing research focused on preparing antifouling biomedical materials.
Insights
Researchers discovered strong shear flow persister (SSP) cells in Pseudomonas aeruginosa. These SSP cells resist washing and form antibiotic-tolerant biofilms, crucial for developing antifouling biomedical materials.
Area of Science:
- Microbiology
- Biomaterials Science
- Infectious Diseases
Background:
- Hospital-acquired infections are frequently linked to contaminated biomedical devices.
- Environmental bacteria, like Pseudomonas aeruginosa, pose a persistent threat in healthcare settings.
- Device-associated infections contribute significantly to patient morbidity and mortality.
Purpose of the Study:
- To identify and characterize novel persister cells in Pseudomonas aeruginosa.
- To investigate the resistance mechanisms of these cells against mechanical stress and antibiotics.
- To elucidate the molecular basis of their strong adhesion to polymer surfaces.
Main Methods:
- Isolation and identification of strong shear flow persister (SSP) cells from Pseudomonas aeruginosa cultures.
- Assessment of SSP cell tolerance to mechanical washing on various polymer materials.
- Biofilm formation assays and evaluation of antibiotic tolerance (specifically aminoglycosides).
- Molecular analysis to determine the mechanism of adhesion complex formation.
Main Results:
- First-time identification of strong shear flow persister (SSP) cells in Pseudomonas aeruginosa.
- SSP cells exhibit remarkable resistance to mechanical washing on polymer surfaces.
- These cells form biofilms with significant tolerance to high concentrations of aminoglycoside antibiotics.
- A molecular mechanism involving outer membrane protein-polysaccharide crosslinking was identified, leading to strong adhesion complexes (up to 50 N mm⁻²).
Conclusions:
- SSP cells represent a distinct phenotype of Pseudomonas aeruginosa with unique resistance properties.
- The identified adhesion mechanism provides insight into biofilm formation and device contamination.
- These findings are critical for the development of advanced antifouling biomedical materials to combat device-associated infections.
