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Antimicrobial peptides with high bioactivity against MDR isolates: Addressing public health concerns

Ali Salehi1, Anat Yanai2, Amelia Richter2

  • 1Canada's Michael Smith Genome Sciences Centre, BC Cancer Agency, Canada; Public Health Laboratory, British Columbia Centre for Disease Control, Canada; Department of Medical Genetics, University of British Columbia, Canada.

Microbial Pathogenesis
|July 22, 2025
PubMed

Insights

Antimicrobial peptides show strong activity against drug-resistant bacteria, offering a promising alternative to traditional antibiotics. TeRu4 is a potential lead candidate for treating infections caused by multi-drug resistant pathogens.

Area of Science:

  • Microbiology
  • Biochemistry
  • Pharmacology

Background:

  • Antimicrobial resistance (AMR) is a critical global health threat.
  • Overuse of antibiotics in agriculture and medicine drives AMR.
  • There is an urgent need for novel therapeutics against multi-drug resistant (MDR) pathogens.

Purpose of the Study:

  • To evaluate the antimicrobial efficacy of structurally distinct antimicrobial peptides (AMPs) against drug-resistant Escherichia coli.
  • To assess the toxicity and therapeutic potential of selected AMPs.
  • To identify lead candidate AMPs for combating MDR bacterial infections.

Main Methods:

  • Screening of 13 diverse antimicrobial peptides against MDR E. coli strains.
  • Determination of minimum inhibitory concentrations (MICs).
  • Toxicity assays including hemolysis and cell viability tests to calculate therapeutic indices.

Main Results:

  • AMPs maintained robust bioactivity against MDR E. coli isolates, with minimal loss of efficacy compared to susceptible strains.
  • TeRu4 demonstrated potent antimicrobial activity with an MIC of 0.5 μg/mL.
  • TeRu4 exhibited a high therapeutic index, exceeding 256, indicating favorable safety and efficacy.

Conclusions:

  • Antimicrobial peptides show significant potential as alternatives to conventional antibiotics.
  • AMPs can effectively combat drug-resistant bacterial infections.
  • TeRu4 is a promising candidate for further development as a therapeutic agent against MDR pathogens.
Keywords:
Antimicrobial peptidesAntimicrobial resistanceCross-resistanceMDR bacterial infections

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