title: Comparative study between coral-mesenchymal stem cells-rhBMP-2 composite and auto-bone-graft in rabbit critical-sized cranial defect model.
abstract: Tissue engineered bone has become a bone substitute for the treatment of bone defects in animal research. This study investigated the osteogenesis capacity of coral-MSCs-rhBMP-2 composite with the auto-bone-graft as control. Coral-MSCs-rhBMP-2 composite were fabricated by coral (as main scaffold), rhBMP-2 (as growth factor), and MSCs (cultured from iliac marrow as seed cells). Critical-sized defects (d = 15 mm) were made on forty rabbits crania and treated by different composite scaffolds: iliac autograft (n = 8), coral (n = 8), rhBMP-2/coral (n = 8), and MSCs/rhBMP-2/coral (n = 8). The defects were evaluated by gross observation, radiographic examination, histological examination, and histological fluorescence examinations after 8 and 16 weeks. The results showed that repair of bone defect was the least in coral group, and significant ingrowth of new bone formation and incorporation could be seen with 77.45% +/- 0.52% in radiopacity in MSCs/rhBMP-2/coral group, which was similar to that in iliac autograft group (84.61% +/- 0.56% in radiopacity). New bone formation in MSCs/rhBMP-2/coral group was more than that in rhBMP-2/coral group. And osteogenesis rate in MSCs/rhBMP-2/coral group (10.23 +/- 1.45 microm) was much faster than that in rhBMP-2/coral group (5.85 +/- 2.19 microm) according to histological fluorescence examination. Newly formed bone partly came from induced MSCs in composite scaffold according to bromodeoxyuridine immunohistochemical examination. These data implicated that MSCs could produce synergic effect with coral-rhBMP-2, and the tissue engineered bone of coral-MSCs-rhBMP-2 is comparable to auto-bone-graft for the repair of critical-sized bone defect.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Stomatological College, Fourth Military Medical University, ChangLe West Road, 145 Xi'an, Shaanxi 710032, China. hourui@fmmu.edu.cn
authors.forename: Rui
authors.initials: R
authors.lastname: Hou
authors.forename: Fulin
authors.initials: F
authors.lastname: Chen
authors.forename: Yaowu
authors.initials: Y
authors.lastname: Yang
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Cheng
authors.forename: Zhan
authors.initials: Z
authors.lastname: Gao
authors.forename: Hongwei Ou
authors.initials: HO
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Tianqiu
authors.initials: T
authors.lastname: Mao
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D037421:Anthozoa; D001705:Bioprosthesis; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D018786:Bone Substitutes; D003692:Delayed-Action Preparations; D004195:Disease Models, Animal; D017102:Fracture Healing / Q000187:drug effects; D006801:Humans; D020007:Implants, Experimental; D059630:Mesenchymal Stem Cells / Q000473:pathology; D010012:Osteogenesis / Q000187:drug effects; D011817:Rabbits; D011994:Recombinant Proteins / Q000494:pharmacology; D012886:Skull / Q000293:injuries / Q000473:pathology / Q000601:surgery; D012887:Skull Fractures / Q000473:pathology / Q000601:surgery*; D023822:Tissue Engineering; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014182:Transplantation, Autologous
chemical_list: C525718:BMP2 protein, human; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D018786:Bone Substitutes; D003692:Delayed-Action Preparations; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta