Development of polylactic-co-glycolic acid-polyethylene glycol nanoparticles as drug carriers to promote wound healing

Impaired wound healing is a common complication of orthopedic surgery and poses a difficult challenge in the clinic. Fibroblasts are thought to play a significant role in wound healing, and can be positively affected by low concentrations of rapamycin; however, rapamycin is cytotoxic at higher concentrations. To address this issue, a RAPA/PLGA-PEG drug delivery system was constructed in this study to maintain low concentrations of rapamycin. The results showed that the nanoparticles were stable, had good sustained drug release properties and were able to reduce the toxicity of rapamycin to fibroblasts. These findings suggest that RAPA/PLGA-PEG nanoparticles can reduce the cytotoxicity of rapamycin and may be a potential clinical treatment for impaired wound healing.