title: Promotion of hydroxyapatite-associated, stem cell-based bone regeneration by CCN2.
abstract: Multiple roles have been already recognized for CCN2 in cartilage development and regeneration. However, the effects of CCN2 on bone regeneration remain to be elucidated. In this study, the utility of CCN2 on bone regeneration was examined in vitro and in vivo in combination with hydroxyapatite (HAp) as a scaffold. Human bone marrow stromal cells (hBMSCs) were isolated from human iliac bone marrow aspirates of healthy donors and expanded, and the effects of CCN2 on their proliferation and migration were examined in vitro. The proliferation of hBMSCs on a plastic or HAp plate was significantly enhanced by CCN2. Moreover, the migration of hBMSCs also dramatically increased by CCN2. Interestingly, a C-terminal signal modular fragment of CCN2 (CT-module) also enhanced the cell proliferation and migration as efficiently as the full-length CCN2. Next, in order to estimate the effect of CCN2 on the migration and survival of hBMSCs and bone formation inside the HAp scaffold in vivo, two experiments were performed. First, the porous HAp carrier was cultured with hBMSCs for a week, and the cell-scaffold hybrid was transplanted with or without CCN2 subcutaneously into immunocompromised mice. CCN2 accelerated the hBMSC-like cell migration and survival inside the porous HAp within 4 weeks after transplantation. Second, the porous HAp carrier with or without CCN2 was directly implanted into bone defects within a rabbit mandible, and bone regeneration inside was evaluated. As a result, CCN2 efficiently induced the cell invasion and bone formation inside the porous HAp scaffold. These findings suggest that CCN2 and its CT-module fragment could be useful for regeneration and reconstruction of large-scale bone defects.
authors.affiliation: Department of Oral and Maxillofacial Rehabilitation, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan.
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Ono
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kubota
authors.forename: Takuo
authors.initials: T
authors.lastname: Fujisawa
authors.forename: Wataru
authors.initials: W
authors.lastname: Sonoyama
authors.forename: Harumi
authors.initials: H
authors.lastname: Kawaki
authors.forename: Kentaro
authors.initials: K
authors.lastname: Akiyama
authors.forename: Kengo
authors.initials: K
authors.lastname: Shimono
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Oshima
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishida
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Suzuki
authors.forename: Masaharu
authors.initials: M
authors.lastname: Takigawa
authors.forename: Takuo
authors.initials: T
authors.lastname: Kuboki
mesh_terms: D000328:Adult; D000818:Animals; D001861:Bone Regeneration / Q000187:drug effects* / Q000502:physiology; D018786:Bone Substitutes; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D055513:Connective Tissue Growth Factor; D017886:Durapatite; D006801:Humans; D017874:Immediate-Early Proteins / Q000494:pharmacology*; D036341:Intercellular Signaling Peptides and Proteins / Q000494:pharmacology*; D008297:Male; D059630:Mesenchymal Stem Cells; D051379:Mice; D011817:Rabbits; D013234:Stem Cells; D017154:Stromal Cells; D054457:Tissue Scaffolds
chemical_list: D018786:Bone Substitutes; C526317:CCN2 protein, human; C526318:CCN2 protein, mouse; D017874:Immediate-Early Proteins; D036341:Intercellular Signaling Peptides and Proteins; D055513:Connective Tissue Growth Factor; D017886:Durapatite