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Near-infrared light-triggered drug delivery system based on black phosphorus for in vivo bone regeneration.
Biomaterials 2018 October
A near-infrared (NIR) light-triggered drug delivery platform is produced by incorporating SrCl2 and BP nanosheets (BPs) into poly(lactic-co-glycolic acid) (PLGA) for bone regeneration. The fabricated BP-SrCl2 /PLGA microspheres show efficient NIR absorption and photothermal effects due to the BPs. The NIR-triggered release behavior of Sr2+ by flawing the PLGA shells is investigated and the microspheres exhibit excellent cell viability and biodegradability. Implantation of the BP-SrCl2 /PLGA microspheres into a rat femoral defect demonstrates good tissue compatibility and excellent bone regeneration capacity under NIR light irradiation. Our study indicates that local release of Sr2+ at optimal time periods controlled by NIR irradiation improves bone regeneration significantly and this NIR-triggered drug delivery system composed of BPs is suitable for therapies requiring precise control at specific time.
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