High hydrostatic pressure sensitized outer-membrane mutants of Salmonella and Pseudomonas to antimicrobial peptides and lactoferrin by disrupting their protective outer membranes — a combined physical-biological antimicrobial strategy.
Shield brokenHigh pressure disrupted gram-negative bacteria's outer membrane barrier, allowing antimicrobial peptides like lactoferricin to kill previously resistant organisms
What the researchers found
High hydrostatic pressure sensitized Salmonella typhimurium and Pseudomonas aeruginosa outer-membrane mutants to lactoferrin, lactoferricin, and other antimicrobial peptides through outer membrane disruption.
Why it matters
Gram-negative bacteria are the hardest to treat with antimicrobial peptides. Combining pressure disruption with peptide exposure could make previously resistant bacteria treatable.
How the study worked
In-vitro study applying high hydrostatic pressure to gram-negative bacteria before or simultaneously with antimicrobial peptide exposure. MIC/MBC determinations for multiple peptides under pressure-treated conditions.
What this study cannot tell us
In-vitro study. Clinical application of high-pressure treatment is limited to food processing and potentially wound care. The pressures used may not be achievable in clinical settings.
How to read the evidence
Preliminary in-vitro evidence demonstrating a novel combination antimicrobial strategy with clear mechanism.
When this study was published
Published in 2003. High-pressure processing combined with antimicrobial peptides has been further developed for food safety applications.
The bigger picture
Combining physical and biological antimicrobial strategies could overcome barriers that each approach faces alone — pressure opens the door for peptides to enter.
Questions still open
- Could high-pressure wound treatment combined with antimicrobial peptides treat resistant infections?
- Does this apply to other gram-negative pathogens?
- Can lower pressures achieve similar sensitization?
Common questions
Why are gram-negative bacteria hard to kill with peptides?
How does pressure help?
Read the original research
Sensitization of outer-membrane mutants of Salmonella typhimurium and Pseudomonas aeruginosa to antimicrobial peptides under high pressure.
Journal of food protection, 66(8), 1360-7
Citation
Masschalck, Barbara; Deckers, Daphne; Michiels, Chris W. (2003). Sensitization of outer-membrane mutants of Salmonella typhimurium and Pseudomonas aeruginosa to antimicrobial peptides under high pressure.. Journal of food protection, 66(8), 1360-7.