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Bacteria primed by antimicrobial peptides develop tolerance and persist.

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Sub-lethal antimicrobial peptides (AMPs) exposure primes bacteria like E. coli to develop tolerance and persistence, potentially increasing infection duration and resistance evolution. High AMP concentrations and sustained expression are key to overcoming these adaptive responses.

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Area of Science:

  • Microbiology
  • Immunology
  • Drug Discovery

Background:

  • Antimicrobial peptides (AMPs) are crucial for innate immunity and are being investigated as novel therapeutics amid the antibiotic crisis.
  • Understanding bacterial responses to sub-lethal drug concentrations is vital for effective treatment strategies.

Purpose of the Study:

  • To investigate if pre-exposure to sub-lethal doses of AMPs enhances bacterial survival and promotes resistance evolution.
  • To explore the mechanisms behind AMP-induced bacterial tolerance and persistence.

Main Methods:

  • Experimental priming of Escherichia coli with sub-lethal AMP doses.
  • Analysis of bacterial tolerance and persistence mechanisms, including biofilm formation (curli and colanic acid production).
  • Development of a population dynamic model to predict infection clearance and resistance evolution.

Main Results:

  • Sub-lethal AMP priming induced tolerance and persistence in E. coli, linked to curli and colanic acid production and biofilm formation.
  • The population dynamic model predicted that priming delays infection clearance and accelerates resistance evolution.
  • The described effects are likely applicable to various AMPs and cell-surface-targeting drugs.

Conclusions:

  • Bacterial tolerance and persistence are adaptive responses to sub-lethal AMP exposure, impacting treatment efficacy.
  • Optimal strategies against tolerant bacteria involve high AMP concentrations and rapid, sustained expression.
  • Findings provide insights into non-inherited drug resistance and inform measures to mitigate resistance evolution.