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Antimicrobial Peptide Combination Can Hinder Resistance Evolution.

Bar Maron1,2, Jens Rolff3, Jonathan Friedman2

  • 1Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Rehovot, Israel.

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|July 21, 2022
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Summary
This summary is machine-generated.

Antimicrobial peptide (AMP) combinations can delay bacterial resistance development. A random AMP library prevented detectable resistance in Staphylococcus aureus, offering a strategy against antibiotic-resistant pathogens.

Keywords:
antibiotic resistanceantimicrobial combinationsantimicrobial peptidesexperimental evolution

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Drug Discovery

Background:

  • Antibiotic-resistant pathogens pose a significant global health threat.
  • Antimicrobial peptides (AMPs) are a promising alternative to conventional antibiotics.
  • Bacteria can rapidly develop resistance to AMPs, limiting their therapeutic potential.

Purpose of the Study:

  • To investigate if combination therapy can hinder the evolution of AMP resistance in Staphylococcus aureus.
  • To compare resistance evolution under individual AMP, AMP pair, and combinatorial AMP library treatments.
  • To understand the factors influencing the evolution of AMP resistance in combination therapies.

Main Methods:

  • Evolving Staphylococcus aureus in the presence of individual AMPs, AMP pairs, and a random antimicrobial peptide mixture.
  • Assessing the level of resistance evolved under different treatment conditions.
  • Analyzing the correlation between resistance cost, cross-resistance, and the rate of resistance evolution.

Main Results:

  • Some AMP pairs significantly delayed resistance evolution compared to individual AMPs.
  • Resistance evolution was slowest with a random antimicrobial peptide mixture, showing no detectable resistance.
  • The rate of resistance evolution to combinations correlated with the fitness cost and cross-resistance of individual AMPs.
  • No broad-range AMP resistance was observed; evolved strains remained sensitive to other AMPs.

Conclusions:

  • Antimicrobial peptide combination therapy can effectively delay or prevent the evolution of bacterial resistance.
  • Combinations involving AMPs with high fitness costs and low cross-resistance are most effective in preventing resistance.
  • The development of "resistance-proof" AMP cocktails is a viable strategy for combating antibiotic-resistant pathogens.