Bovine lactoferricin reduced adhesion and invasion of enteropathogenic Yersinia to human cells in a dose-dependent manner — preventing bacterial cell entry, not just killing bacteria.
Blocks invasionAt doses too low to kill bacteria, lactoferricin still prevented them from sticking to and invading cells — anti-virulence protection complementing killing
What the researchers found
Bovine lactoferricin dose-dependently reduced Yersinia adhesion to and invasion of HEp-2 cells even at sub-bactericidal concentrations, demonstrating anti-virulence activity complementing its bactericidal effects.
Why it matters
Preventing bacteria from invading cells is potentially more effective than trying to kill them after infection. This anti-adherence/anti-invasion effect could prevent infection establishment.
How the study worked
In-vitro infection study. Bovine lactoferricin at various concentrations incubated with enteropathogenic Yersinia and HEp-2 cells. Adhesion and invasion quantified by gentamicin protection assay.
What this study cannot tell us
In-vitro cell infection model. The concentrations achievable at intestinal surfaces are uncertain. Single pathogen tested.
How to read the evidence
Preliminary in-vitro evidence with clear dose-dependent anti-adhesion and anti-invasion data in a standard cell infection model.
When this study was published
Published in 2004. Anti-virulence approaches to infection prevention have grown in importance as antibiotic resistance increases.
The bigger picture
Antimicrobial strategies that prevent infection establishment (anti-virulence) rather than killing bacteria (bactericidal) are less likely to drive resistance development.
Questions still open
- Would lactoferricin prevent intestinal Yersinia infection in vivo?
- Does this anti-virulence mechanism extend to other enteric pathogens?
- Could lactoferrin supplementation prevent foodborne Yersinia infection?
Common questions
Can lactoferricin prevent infection without killing bacteria?
Is this better than just killing bacteria?
Read the original research
Effect of bovine lactoferricin on enteropathogenic Yersinia adhesion and invasion in HEp-2 cells.
Journal of medical microbiology, 53(Pt 5), 407-412
Citation
Di Biase, Assunta Maria; Tinari, Antonella; Pietrantoni, Agostina; Antonini, Giovanni; Valenti, Piera; Conte, Maria Pia; Superti, Fabiana. (2004). Effect of bovine lactoferricin on enteropathogenic Yersinia adhesion and invasion in HEp-2 cells.. Journal of medical microbiology, 53(Pt 5), 407-412. https://doi.org/10.1099/jmm.0.05410-0