title: Bone regeneration on a collagen sponge self-assembled peptide-amphiphile nanofiber hybrid scaffold.
abstract: The objective of this study was to create a novel approach to promote bone induction through sustained release of growth factor from a 3-dimensional (3D) hybrid scaffold. Peptide-amphiphile (PA) was synthesized by standard solid-phase chemistry that ends with the alkylation of the NH2 terminus of the peptide. Collagen sponge was reinforced by incorporation of poly(glycolic acid) (PGA) fiber. A 3D network of nanofibers was formed by mixing basic fibroblast growth factor (bFGF) suspensions with dilute aqueous solutions of PA. A hybrid scaffold was fabricated by combination of self-assembled PA nanofibers and collagen sponge reinforced with incorporation of PGA fibers. The in vitro release profile of bFGF from hybrid scaffold was investigated, and ectopic bone formation induced by the released bFGF was assessed after subcutaneous implantation of hybrid scaffold into the backs of rats. Homogeneous bone formation was histologically observed throughout the hybrid scaffolds, in marked contrast to collagen sponge-incorporated bFGF. The level of alkaline phosphatase activity and osteocalcin content at the implanted sites of hybrid scaffolds were significantly high compared with collagen sponge incorporated with bFGF. The combination of bFGF incorporated in a collagen sponge self-assembled PA nanofiber hybrid scaffold is a promising procedure to improve bone regeneration.
authors.affiliation: International Center for Young Scientists, National Institute for Materials Science, Ibaraki, Japan. hossein.hosseinkhani@nims.go.jp
authors.forename: Hossein
authors.initials: H
authors.lastname: Hosseinkhani
authors.forename: Mohsen
authors.initials: M
authors.lastname: Hosseinkhani
authors.forename: Furong
authors.initials: F
authors.lastname: Tian
authors.forename: Hisatoshi
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Tabata
mesh_terms: D000818:Animals; D001861:Bone Regeneration / Q000502:physiology*; D018786:Bone Substitutes / Q000138:chemical synthesis; D003094:Collagen / Q000138:chemical synthesis / Q000648:ultrastructure; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D006801:Humans; D008297:Male; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D010012:Osteogenesis / Q000502:physiology*; D010455:Peptides / Q000138:chemical synthesis* / Q000378:metabolism / Q000502:physiology; D011100:Polyglycolic Acid / Q000138:chemical synthesis; D051381:Rats; D011916:Rats, Inbred F344; D013501:Surface-Active Agents / Q000138:chemical synthesis*; D013552:Swine
chemical_list: D018786:Bone Substitutes; D010455:Peptides; D013501:Surface-Active Agents; D016222:Fibroblast Growth Factor 2; D011100:Polyglycolic Acid; D003094:Collagen