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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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Author Spotlight: Exploring the Antibacterial Effects of Zinc Oxide Nanoparticles in Overcoming Antibiotic Resistance
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Multifunctional Antimicrobial Polypeptide-Selenium Nanoparticles Combat Drug-Resistant Bacteria.

Tao Huang1,2, James A Holden2, Eric C Reynolds2

  • 1Department of Biomedical Engineering, University of Melbourne, Parkville, VIC 3010, Australia.

ACS Applied Materials & Interfaces
|November 30, 2020
PubMed
Summary

Selenium nanoparticles coated with ε-poly-l-lysine show potent broad-spectrum antibacterial activity against resistant strains. This novel antimicrobial nanoparticle approach demonstrates low toxicity and significantly delays bacterial resistance development compared to conventional antibiotics.

Keywords:
antibacterial mechanismantimicrobial peptideantimicrobial resistancecytotoxicityinorganic nanoparticle

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Area of Science:

  • Nanotechnology
  • Microbiology
  • Biomedical Engineering

Background:

  • Antibiotic-resistant bacteria pose a critical global health threat, necessitating novel therapeutic strategies.
  • The World Health Organization highlights the widespread prevalence of antimicrobial resistance (AMR) globally.
  • Antimicrobial nanoparticles are emerging as a promising alternative to combat drug-resistant pathogens.

Purpose of the Study:

  • To synthesize and evaluate selenium nanoparticles coated with ε-poly-l-lysine (Se NP-ε-PL) as an alternative antimicrobial agent.
  • To assess the antibacterial efficacy, cytotoxicity, and resistance development potential of Se NP-ε-PL.
  • To compare the performance of Se NP-ε-PL against its individual components and a conventional antibiotic.

Main Methods:

  • Synthesis of selenium nanoparticles coated with ε-poly-l-lysine (Se NP-ε-PL).
  • Evaluation of antibacterial activity against eight bacterial species, including Gram-positive, Gram-negative, and drug-resistant strains.
  • Cytotoxicity assessment using human dermal fibroblasts.
  • Long-term bacterial resistance development studies against Se NP-ε-PL and kanamycin in *E. coli* and *S. aureus*.

Main Results:

  • Se NP-ε-PL exhibited significantly enhanced antibacterial activity compared to Se NP and ε-PL alone.
  • The nanoparticles displayed no toxicity to human dermal fibroblasts at effective concentrations.
  • Se NP-ε-PL significantly delayed resistance development in *S. aureus* (∼132 generations) compared to kanamycin (∼44 generations).
  • *E. coli* did not develop resistance to Se NP-ε-PL over approximately 300 generations.

Conclusions:

  • Se NP-ε-PL represents a highly effective multifunctional antimicrobial strategy.
  • The combination of selenium nanoparticles and ε-poly-l-lysine offers broad-spectrum activity and low cytotoxicity.
  • This novel approach shows a remarkable ability to inhibit the development of bacterial resistance, offering a promising alternative to conventional antibiotics.