title: Bone regeneration with active angiogenesis by basic fibroblast growth factor gene transfected mesenchymal stem cells seeded on porous beta-TCP ceramic scaffolds.
abstract: Large segmental bone defect repair remains a clinical and scientific challenge with increasing interest focused on combining gene transfer with tissue engineering techniques. Basic fibroblast growth factor (bFGF) is one of the most prominent osteogenic growth factors that has the potential to accelerate bone healing by promoting the proliferation and differentiation of mesenchymal stem cells (MSCs) and the regeneration of capillary vasculature. However, the short biological half-lives of growth factors may impose severe restraints on their clinical usefulness. Gene-based delivery systems provide a better way of achieving a sustained high concentration of growth factors locally in the defect and delivering a more biologically active product than that achieved by exogenous application of recombinant proteins. The objective of this experimental study was to investigate whether the bFGF gene modified MSCs could enhance the repair of large segmental bone defects. The pcDNA3-bFGF gene transfected MSCs were seeded on biodegradable porous beta tricalcium phosphate (beta-TCP) ceramics and allografted into the 15 mm critical-sized segmental bone defects in the radius of 18 New Zealand White rabbits. The pcDNA3 vector gene transfected MSCs were taken as the control. The follow-up times were 2, 4, 6, 8, 10 and 12 weeks. Scanning electron microscopic, roentgenographic, histologic and immunohistological studies were used to assess angiogenesis and bone regeneration. In vitro, the proliferation and differentiation of bFGF gene transfected MSCs were more active than that of the control groups. In vivo, significantly more new bone formation accompanied by abundant active capillary regeneration was observed in pores of the ceramics loaded with bFGF gene transfected MSCs, compared with control groups. Transfer of gene encoding bFGF to MSCs increases their osteogenic properties by enhancing capillary regeneration, thus providing a rich blood supply for new bone formation. This new bFGF gene enhanced tissue engineering strategy could be of potential benefit to accelerate bone healing, especially in defects caused by atrophic nonunion and avascular necrosis of the femoral head.
authors.affiliation: Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science & Technology, 1277 Jiefang Avenue, Wuhan 430022, People's Republic of China. gxdwh@yahoo.com.cn
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Guo
authors.forename: Qixin
authors.initials: Q
authors.lastname: Zheng
authors.forename: Iris
authors.initials: I
authors.lastname: Kulbatski
authors.forename: Quan
authors.initials: Q
authors.lastname: Yuan
authors.forename: Shuhua
authors.initials: S
authors.lastname: Yang
authors.forename: Zengwu
authors.initials: Z
authors.lastname: Shao
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Baojun
authors.initials: B
authors.lastname: Xiao
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Pan
authors.forename: Shuo
authors.initials: S
authors.lastname: Tang
mesh_terms: D000818:Animals; D001861:Bone Regeneration / Q000187:drug effects* / Q000235:genetics; D018786:Bone Substitutes / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry*; D018929:Cell Culture Techniques / Q000379:methods; D002478:Cells, Cultured; D003131:Combined Modality Therapy; D005260:Female; D016222:Fibroblast Growth Factor 2 / Q000235:genetics / Q000627:therapeutic use*; D015316:Genetic Therapy / Q000379:methods; D048091:Guided Tissue Regeneration / Q000379:methods*; D008297:Male; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000502:physiology*; D018919:Neovascularization, Physiologic / Q000187:drug effects* / Q000235:genetics; D011817:Rabbits; D011885:Radius Fractures / Q000473:pathology / Q000628:therapy*; D023822:Tissue Engineering / Q000379:methods; D014162:Transfection / Q000379:methods; D016896:Treatment Outcome
chemical_list: D018786:Bone Substitutes; D002130:Calcium Phosphates; C485817:beta-tricalcium phosphate; D016222:Fibroblast Growth Factor 2