title: Bioactive Natural Protein-Hydroxyapatite Nanocarriers for Optimizing Osteogenic Differentiation of Mesenchymal Stem Cells.
abstract: Improving the controlled release of bioactive growth factors to regulate cell behavior and tissue regeneration remains a need in tissue engineering and regenerative medicine. Inorganic and polymeric nanoparticles have been extensively fabricated as bioactive biomaterials with enhanced biocompatibility and effective carriers of therapeutic agents, however, challenges remain such as the achievement of high loading capacity and sustained release, and the bioactivity preservation of growth factors. Here, a multilayered, silk coated hydroxyapatite (HA) nanocarrier with drug loading-release capacity superior to pure silk or HA nanoparticles was developed. Bone morphogenetic protein-2 (BMP-2) was bound to the silk coatings with a high binding efficiency of 99.6%, significantly higher than that in silk or the HA nanoparticles alone. The release of BMP-2 was sustainedin vitroover a period of 21 days without burst release. Compared with BMP-2 loaded silk or HA particles, bone mesenchymal stem cells (BMSCs) showed improved proliferation and osteogenesis when cultured with the BMP-2 loaded composite nanocarriers. Therefore, these silk-HA composite nanoparticles present a useful approach to designing bioactive nanocarrier systems with enhanced functions for bone tissue regeneration needs.
authors.affiliation: National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People's Republic of China; School of Biology and Basic Medical Sciences, Soochow University, Suzhou 215123, People's Republic of China.
authors.forename: Z Z
authors.initials: ZZ
authors.lastname: Ding
authors.affiliation: Department of Orthopedics, The Second Affiliated Hospital of Soochow University, Suzhou 215000, People's Republic of China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Fan
authors.affiliation: National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People's Republic of China.
authors.forename: X W
authors.initials: XW
authors.lastname: Huang
authors.affiliation: National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People's Republic of China.
authors.forename: S M
authors.initials: SM
authors.lastname: Bai
authors.affiliation: Tai'an City Central Hospital, Taian 271000, People's Republic of China Address.
authors.forename: D W
authors.initials: DW
authors.lastname: Song
authors.affiliation: National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People's Republic of China.
authors.forename: Q
authors.initials: Q
authors.lastname: Lu
authors.affiliation: National Engineering Laboratory for Modern Silk and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People's Republic of China; Department of Biomedical Engineering, Tufts University, Medford, MA 02155, United States.
authors.forename: D L
authors.initials: DL
authors.lastname: Kaplan