title: Experimental study on bone formation potential of cryopreserved human bone marrow mesenchymal cell/hydroxyapatite complex in the presence of recombinant human bone morphogenetic protein-2.
abstract: Secondary bone grafting in the alveolar cleft is one of the most important treatment modalities for patients with a cleft lip and palate. In children, however, harvesting a sufficient amount of bone graft from the donor site is difficult, and the procedure imposes a heavy burden on the patients. This problem may be resolved if autologous transplantation can be performed using a cell-hybrid type of artificial bone prepared with the patient's own bone marrow cells through a tissue engineering technique. In the current study, we examined the possibility of achieving such an autologous transplantation using cryopreserved human bone marrow cells. Human bone marrow cells were grown in culture and cryopreserved, and the cells preserved for 3 years and the cells preserved for 3 months were then thawed and recultivated. In one experiment, the recultivated cells were seeded onto a complex composed of porous hydroxyapatite and bone morphogenetic protein (BMP), and the complex was grafted subcutaneously in nude mice. In another experiment, the cells were seeded onto the porous hydroxyapatite and cultivated for 10 days before grafting in a medium supplemented with BMP. The bone formation potential of the cells was compared between these two experiments. Formation of mature bone was observed 2 weeks after transplantation in the former experiment, whereas only scarce bone formation was evident 4 weeks after transplantation in the latter experiment. It is therefore assumed that exposing the cultured human bone marrow cells to a high concentration of BMP in vivo strongly promotes bone formation.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Kitasato University School of Medicine, Kanagawa, Japan. kprs@kitasato-u.ac.jp
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Shimakura
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Yamzaki
authors.forename: Eijyu
authors.initials: E
authors.lastname: Uchinuma
mesh_terms: D000328:Adult; D000818:Animals; D001672:Biocompatible Materials / Q000627:therapeutic use*; D001854:Bone Marrow Cells / Q000502:physiology*; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000627:therapeutic use*; D018786:Bone Substitutes / Q000627:therapeutic use*; D016025:Bone Transplantation; D002478:Cells, Cultured; D002648:Child; D015925:Cryopreservation; D003470:Culture Media; D062109:Dermatologic Surgical Procedures; D017886:Durapatite / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D006822:Hybrid Cells / Q000637:transplantation; D008297:Male; D008648:Mesoderm / Q000166:cytology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D023421:Models, Animal; D010012:Osteogenesis / Q000502:physiology*; D011994:Recombinant Proteins; D013997:Time Factors; D023822:Tissue Engineering; D016212:Transforming Growth Factor beta / Q000627:therapeutic use*; D014182:Transplantation, Autologous
chemical_list: C525718:BMP2 protein, human; D001672:Biocompatible Materials; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D018786:Bone Substitutes; D003470:Culture Media; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2; D017886:Durapatite