Subverting bacterial resistance using high dose, low solubility antibiotics in fibrin

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Pharmacology

Background:

• Multi-drug resistant (MDR) Staphylococcus aureus poses a significant threat.
• Conventional antibiotics often fail against MDR strains.
• Novel drug delivery systems are needed to overcome antibiotic resistance.

Purpose of the Study:

• To evaluate the efficacy of antibiotics delivered via fibrin for controlling MDR Staphylococcus aureus infections.
• To investigate the ability of fibrin-encapsulated, low-solubility antibiotics to restore susceptibility in resistant bacterial strains.

Main Methods:

• Low aqueous solubility antibiotics were encapsulated within a fibrin matrix.
• Electron microscopy was used to visualize encapsulated antibiotic crystals.
• In vitro agar disk diffusion assays assessed bacterial growth inhibition.
• In vivo studies involved intraperitoneal injection in rats with induced MDR S. aureus peritonitis.

Main Results:

• Fibrin encapsulation successfully contained low solubility antibiotics (e.g., streptomycin, sulfamethoxazole-trimethoprim).
• Fibrin-delivered streptomycin and sulfamethoxazole-trimethoprim restored susceptibility in MDR S. aureus in vitro.
• Erythromycin, penicillin G, and tetracycline showed limited efficacy.
• Intraperitoneal injection of fibrin-delivered streptomycin resulted in 100% survival in a rat model of MDR S. aureus peritonitis.

Conclusions:

• Fibrin-based delivery systems can effectively control infections caused by MDR Staphylococcus aureus.
• This approach shows promise for overcoming antibiotic resistance with low solubility antibiotics.
• Fibrin encapsulation offers a viable strategy for enhancing antibiotic efficacy against challenging pathogens.