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• W4291737360 endingPage "121721" @default.
• W4291737360 startingPage "121721" @default.
• W4291737360 abstract "Current clinical products delivering the osteogenic growth factor bone morphogenetic protein 2 (BMP-2) for bone regeneration have been plagued by safety concerns due to a high incidence of off-target effects resulting from bolus release and supraphysiological doses. Layer-by-layer (LbL) film deposition offers the opportunity to coat bone defect-relevant substrates with thin films containing proteins and other therapeutics; however, control of release kinetics is often hampered by interlayer diffusion of drugs throughout the film during assembly, which causes burst drug release. In this work, we present the design of different laponite clay diffusional barrier layer architectures in self-assembled LbL films to modulate the release kinetics of BMP-2 from the surface of a biodegradable implant. Release kinetics were tuned by incorporating laponite in different film arrangements and with varying deposition techniques to achieve release of BMP-2 over 2 days, 4 days, 14 days, and 30 days. Delivery of a low dose (0.5 μg) of BMP-2 over 2 days and 30 days using these LbL film architectures was then compared in an in vivo rat critical size calvarial defect model to determine the effect of BMP-2 release kinetics on bone regeneration. After 6 weeks, sustained release of BMP-2 over 30 days induced 3.7 times higher bone volume and 7.4 times higher bone mineral density as compared with 2-day release of BMP-2, which did not induce more bone growth than the uncoated scaffold control. These findings represent a crucial step in the understanding of how BMP-2 release kinetics influence treatment efficacy and underscore the necessity to optimize protein delivery methods in clinical formulations for bone regeneration. This work could be applied to the delivery of other therapeutic proteins for which careful tuning of the release rate is a key optimization parameter." @default.
• W4291737360 created "2022-08-16" @default.
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• W4291737360 date "2022-09-01" @default.
• W4291737360 modified "2023-10-16" @default.
• W4291737360 title "Sustained release of BMP-2 using self-assembled layer-by-layer film-coated implants enhances bone regeneration over burst release" @default.
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• W4291737360 doi "https://doi.org/10.1016/j.biomaterials.2022.121721" @default.
• W4291737360 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35981926" @default.
• W4291737360 hasPublicationYear "2022" @default.
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