The antimicrobial effects of PLGA microspheres containing the antimicrobial peptide OP-145 on clinically isolated...

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Orthopedic Surgery

Background:

• Fracture-related infections pose a significant challenge to bone healing.
• Antimicrobial peptides and poly-lactic-co-glycolic acid (PLGA) microspheres offer potential therapeutic strategies for bone infections.
• Developing effective treatments for bone infections is crucial for patient outcomes.

Purpose of the Study:

• To evaluate the efficacy of OP-145 antimicrobial peptides encapsulated in PLGA microspheres for treating bone infections.
• To assess the impact of OP-145 PLGA microspheres on biofilm formation and inflammatory markers in a rat fracture model.
• To determine the potential of this novel drug delivery system in managing post-fracture infections.

Main Methods:

• A rat model was used with a control group receiving saline and a treatment group receiving OP-145 PLGA microspheres and vancomycin.
• Biofilm formation was analyzed using fluorescence microscopy.
• Serum C-reactive protein (CRP) levels, an indicator of inflammation, were measured at multiple time points (12, 24, 48, and 72 hours).

Main Results:

• OP-145 PLGA microspheres demonstrated significant inhibition of clinically isolated bacterial strains (P < 0.05).
• A significant reduction in serum CRP levels was observed in the treatment group compared to the control group (P < 0.05).
• Fluorescence microscopy indicated a notable decrease in biofilm formation in the treatment group.

Conclusions:

• OP-145 PLGA microspheres provide a sustained release of antimicrobial peptides.
• This formulation significantly reduces bacterial biofilm formation, a key factor in chronic infections.
• The treatment effectively lowers levels of inflammatory factors, suggesting a beneficial role in managing bone infections and promoting fracture healing.