title: In vivo bone-forming capacity of human bone marrow-derived stromal cells is stimulated by recombinant human bone morphogenetic protein-2.
abstract: In the present study, we investigated whether the in vivo bone-forming capacity of human bone marrow-derived stromal cells (HMSCs) could be enhanced by recombinant human bone morphogenetic protein-2 (rhBMP-2). The HMSCs obtained from seven donors (5-54 years of age) were passaged three to six times. Passaged HMSCs exhibited the osteoblastic phenotype in vitro, including: (a) an increase in alkaline phosphatase (ALP) activity in response to dexamethasone, ascorbic acid, and beta-glycerophosphate: and (b) mRNA expression for markers of osteoblastic lineage (ALP, osteopontin, osteocalcin, and parathyroid hormone-receptor) and BMP-2, -4, and -6 detected by reverse transcription-polymerase chain reaction. For the in vivo assay, transplants were subcutaneously implanted into nude mice as follows: group A (vehicle); group B (rhBMP-2); group C (HMSCs with vehicle); and group D (HMSCs with rhBMP-2). Transplants were obtained 2 and 4 weeks after implantation. Correlated radiographic findings, histological observations, and in situ hybridization using species-specific probes showed that the group B transplants contained bone tissue of mouse origin, which was observed at the periphery of the transplants. Four weeks after implantation, small amounts of HMSCs-derived bone tissue were detected at the periphery in two of seven transplants in group C. In contrast, five of seven group D transplants exhibited HMSCs-derived bone tissue, which was located at the center of the transplants and was surrounded by mouse bone tissue. Furthermore, HMSCs-derived chondrogenesis was detected in two of seven group D transplants. The results of the present study demonstrate that culture-expanded HMSCs preserve the osteoblastic phenotype, and the in vivo bone-forming capacity can be promoted by rhBMP-2.
authors.affiliation: Department of Orthopedic Surgery, Niigata University School of Medicine, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yamagiwa
authors.forename: N
authors.initials: N
authors.lastname: Endo
authors.forename: K
authors.initials: K
authors.lastname: Tokunaga
authors.forename: T
authors.initials: T
authors.lastname: Hayami
authors.forename: H
authors.initials: H
authors.lastname: Hatano
authors.forename: H E
authors.initials: HE
authors.lastname: Takahashi
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D001854:Bone Marrow Cells / Q000502:physiology*; D016026:Bone Marrow Transplantation; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D002478:Cells, Cultured; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D008875:Middle Aged; D010006:Osteoblasts / Q000502:physiology*; D010012:Osteogenesis; D011994:Recombinant Proteins / Q000494:pharmacology; D017154:Stromal Cells / Q000502:physiology / Q000637:transplantation; D016212:Transforming Growth Factor beta; D014183:Transplantation, Heterologous
chemical_list: C525718:BMP2 protein, human; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2