Two-Tailed Dynamic Covalent Amphiphile Combats Bacterial Biofilms

Area of Science:

• Biomaterials Science
• Antimicrobial Research
• Nanotechnology

Background:

• Drug resistance in bacteria and biofilms is a significant global health challenge.
• Developing facile methods for drug combination construction and nanocomposite application is crucial.
• Existing treatments often struggle against multidrug-resistant strains.

Purpose of the Study:

• To develop novel two-tailed antimicrobial amphiphiles (T²A²) for combating bacterial resistance.
• To investigate the self-assembly properties and antimicrobial efficacy of these T²A² nanoparticles.
• To evaluate the potential of T²A² assemblies as a non-antibiotic therapeutic strategy.

Main Methods:

• Synthesis of two-tailed antimicrobial amphiphiles (T²A²) from nitric oxide (NO)-donor and natural aldehydes.
• Characterization of T²A² self-assembly into nanoparticles.
• Assessment of bactericidal efficacy against multidrug-resistant bacteria and biofilms.
• Mechanism studies including molecular dynamics simulations, proteomics, and metabolomics.
• In vivo evaluation in murine infection models.

Main Results:

• T²A² self-assembled into nanoparticles with low critical aggregation concentration.
• Cinnamaldehyde (Cin)-derived T²A² (Cin-T²A²) showed superior bactericidal efficacy compared to free components.
• Cin-T²A² assemblies effectively killed multidrug-resistant staphylococci and eradicated their biofilms through multiple mechanisms.
• In vivo studies demonstrated rapid bacterial eradication and inflammation alleviation in infected mice.

Conclusions:

• T²A² assemblies represent an efficient, non-antibiotic strategy against drug-resistant bacteria and biofilms.
• The self-assembly into nanoparticles enhances antimicrobial activity.
• This approach holds promise for addressing the growing threat of antimicrobial resistance.