Synergistic reinforcement of polydopamine-coated hydroxyapatite and BMP2 biomimetic peptide on the bioactivity of PMMA-based cement

To be better used as implant materials in bone regeneration, bioactivity and osteogenesis of poly(methyl methacrylate) (PMMA)-based bone cement need to be further enhanced. In this study, bioactive hydroxyapatite (HA) nanoparticle decorated with polydopamine (pDA) and BMP2 mimicking peptide (serine-serine-valine-proline-threonine, SSVPT) was incorporated into PMMA-based cement (px-HA/PMMA). The presence of pDA layer on HA surface could keep the mechanical property of px-HA/PMMA cements comply with the requirement of clinical application. More importantly, the px-HA/PMMA cement exhibited excellent biomechanical property with enhanced interfacial adhesion between cement and swine femur. Biomineralization and cell experiment in vitro showed that the incorporation of pDA-coated HA and SSVPT can synergistically enhance the bioactivity of px-HA/PMMA cement for regeneration and provide an attractive strategy to reconstruction of load-bearing bone.