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Compounds Containing 2,3-Bis(phenylamino) Quinoxaline Exhibit Activity Against Methicillin-Resistant Staphylococcus

Gilda Padalino1,2, Katrina Duggan3, Luis A J Mur2

  • 1Swansea University Medical School, Swansea, UK.

Microbiologyopen
|December 12, 2024
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Two novel quinoxaline derivatives show potent antimicrobial activity against resistant bacteria like MRSA and VRE. These compounds also effectively inhibit bacterial biofilm formation, offering promise as new antibacterial agents.

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Enterococcus faecalisEnterococcus faeciumMRSAStaphylococcus aureusVREbiofilmquinoxaline

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Antimicrobial resistance (AMR) poses a significant global health threat, complicating the treatment of bacterial infections.
  • The emergence of multidrug-resistant pathogens necessitates the development of novel antimicrobial agents.

Purpose of the Study:

  • To evaluate the antimicrobial properties of 2,3-N,N-diphenyl quinoxaline derivatives.
  • To assess the efficacy of these derivatives against Gram-positive, Gram-negative, and Mycobacterium species, including resistant strains.

Main Methods:

  • Synthesis and characterization of 2,3-N,N-diphenyl quinoxaline derivatives.
  • Determination of Minimum Inhibitory Concentrations (MICs) against various bacterial strains.
  • Evaluation of activity against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) strains.
  • Assessment of biofilm inhibition capabilities.

Main Results:

  • Two quinoxaline derivatives (compounds 25 and 31) displayed significant antimicrobial activity against Staphylococcus aureus, Enterococcus faecium, and Enterococcus faecalis, with MICs from 0.25 to 1 mg/L.
  • These compounds were effective against MRSA and VRE strains, showing comparable or superior activity to vancomycin, teicoplanin, daptomycin, and linezolid.
  • The derivatives demonstrated superior efficacy in preventing Staphylococcus aureus and Enterococcus faecalis biofilm formation compared to other antibiotics.

Conclusions:

  • The studied quinoxaline derivatives exhibit potent broad-spectrum antibacterial activity, including against resistant strains.
  • These compounds show significant potential as novel antibacterial agents for combating challenging bacterial infections.
  • The ability to inhibit biofilm formation further enhances the therapeutic potential of these quinoxaline derivatives.