Functionalized Polymers Enhance Permeability of Antibiotics in Gram-negative MDR Bacteria and Biofilms for...

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Nanotechnology

Background:

• Multi-drug resistant (MDR) bacteria, especially Gram-negative pathogens, pose a significant global health threat.
• Antibiotic efficacy is limited by bacterial membrane penetration and biofilm formation, where the extracellular polymeric substance (EPS) matrix impedes drug diffusion.
• Existing treatments struggle against MDR infections due to these inherent protective mechanisms.

Purpose of the Study:

• To investigate engineered polymeric nanoparticles as a strategy to enhance antibiotic penetration and efficacy against MDR Gram-negative bacteria and biofilms.
• To explore the synergistic potential of combining these nanoparticles with antibiotics for improved antimicrobial therapy.
• To establish a structure-activity relationship for polymer functionalization in enhancing antimicrobial combinations.

Main Methods:

• Development and engineering of polymeric nanoparticles with tailored chemical groups.
• Combination therapy utilizing engineered nanoparticles and antibiotics against MDR Gram-negative bacteria and biofilms.
• Assessment of nanoparticle-antibiotic synergy and impact on antibiotic dosage reduction.
• Evaluation of structure-activity relationships of polymer modifications.

Main Results:

• Engineered polymeric nanoparticles successfully enhanced antibiotic accumulation within Gram-negative bacteria and biofilm matrices.
• The combination therapy demonstrated significantly increased antibiotic potency, reducing the required antibiotic dosage by up to 32-fold.
• Tailoring of chemical groups on polymer scaffolds revealed a strong structure-activity relationship, crucial for additive and synergistic effects.
• Polymeric nanoparticles effectively 'rejuvenated' antibiotics against resistant bacterial strains and biofilms.

Conclusions:

• Engineered polymeric nanoparticles offer a promising approach to overcome MDR bacterial infections and biofilms.
• This strategy enhances antibiotic delivery and efficacy, enabling substantial dose reduction and potentially mitigating resistance development.
• The study provides a foundation for designing novel polymeric compounds for advanced antimicrobial combination therapies.