Engineered macroporous hydrogel scaffolds via pickering emulsions stabilized by MgO nanoparticles promote bone regeneration. Issue 28 (19th June 2020)

• Record Type: Journal Article
• Authors: Pan, Haotian; Gao, Huichang; Li, Qingtao; Lin, Zefeng; Feng, Qi; Yu, Chenxi; Zhang, Xiaohua; Dong, Hua; Chen, Dafu; Cao, Xiaodong
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 28(2020)
• Page Start: 6100
• Page End: 6114
• Publication Date: 2020-06-19
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Biomedical materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tb00901f
• Languages: English
• ISSNs: 2050-750X

Abstract

Abstract : A novel macroporous composite hydrogel scaffolds were developed by using Pickering emulsions stabilized by MgO NPs for application in the field of bone regeneration. Abstract : Hydrogels are appealing biomaterials for regenerative medicine since biomimetic modifications of their polymeric network can provide unique physical properties and emulate the native extracellular matrix (ECM). Meanwhile, therapeutic metal ions, such as magnesium ions (Mg 2+ ), not only regulate cellular behaviours but also stimulate local bone formation and healing. However, the absence of a meaningful macroporous structure and the uncompromising mechanical strength are still challenges. Herein, we designed a macroporous composite hydrogel based on mild and fast thiol–ene click reactions. The Pickering emulsion method was adopted to form a macroporous structure and introduce MgO nanoparticles (NPs). The results show that the composite hydrogel possesses good mechanical strength and an evenly distributed macroporous structure. MgO NPs stabilized at the oil/water interface not only function as effective emulsion stabilizers, but also enhance the mechanical properties of hydrogels and mediate the sustained release of Mg 2+ . In vitro cell experiments demonstrated that the composite hydrogel displays good biocompatibility. More importantly, the release of Mg 2+ ions from hydrogels can effectively promote the osteogenic differentiation of BMSCs. Furthermore, an in vivo study showed that macroporous hydrogels can provide a good extracellular matrix microenvironment for in situ osteogenesis and accelerate bone tissue regeneration.