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Biocompatible Guanidine-Functionalized Compounds with Biofilm and Membrane Disruptive Activity Against MRSA.

Pamella Fukuda de Castilho1, Luana Janaína de Campos2, Audifás-Salvador Matus-Meza2

  • 1Faculty of Health Sciences, Federal University of Grande Dourados, Dourados, Mato Grosso do Sul 79804-970, Brazil.

ACS Infectious Diseases
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Summary

New guanidine-based compounds show potent antibacterial and antibiofilm activity against methicillin-resistant Staphylococcus aureus (MRSA). These compounds demonstrate promising efficacy and safety profiles for potential MRSA drug development.

Keywords:
CA-MRSAHA-MRSAStaphyloccocus aureusantimicrobialguanidineresistant

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant global health threat due to increasing antibiotic resistance.
  • Development of novel therapeutic agents with unique mechanisms of action is crucial to combat MRSA infections.

Purpose of the Study:

  • To synthesize and evaluate novel guanidine-functionalized 3,4-dihydropyrimidin-2(1H)-imine compounds for antibacterial and antibiofilm activity.
  • To investigate the mechanism of action, synergistic potential, safety, and in vivo efficacy of these compounds against MRSA.

Main Methods:

  • Synthesis of three guanidine-functionalized compounds (5a, 5b, 5c).
  • In vitro evaluation of antibacterial activity (MICs) and antibiofilm potential (biomass, metabolic activity, gene expression via RT-qPCR, matrix disruption via confocal microscopy).
  • Ex vivo and in vivo efficacy studies in porcine skin and Tenebrio molitor models, respectively; assessment of cytotoxicity, mutagenicity, hemolysis, and resistance potential.

Main Results:

  • Compounds exhibited significant bacteriostatic effects against Staphylococcus aureus, CA-MRSA, and HA-MRSA (MICs: 2.34-4.68 μg/mL).
  • Demonstrated potent in vitro and ex vivo antibiofilm activity, reducing biomass, metabolic activity, and disrupting biofilm matrix components.
  • Showed favorable biocompatibility, low resistance induction potential, intracellular stability, and in vivo efficacy in a larval model; synergistic effects with oxacillin observed for compounds 5a and 5c.

Conclusions:

  • The synthesized guanidine-based compounds possess broad-spectrum antibacterial and potent antibiofilm activities against MRSA.
  • These compounds exhibit a multifactorial mechanism of action, including biofilm matrix disruption and synergistic potential with existing antibiotics.
  • The favorable safety profile and demonstrated in vivo efficacy position these compounds as promising candidates for novel MRSA drug development.