title: Mesenchymal stem cell-mediated gene delivery of bone morphogenetic protein-2 in an articular fracture model.
abstract: In articular fractures, both bone and cartilage are injured. We tested whether stem cells transduced with bone morphogenetic protein 2 (BMP2) can promote bone and cartilage repair. Distal femoral articular osteotomies in nude rats were treated with stem cells, either wild-type or transduced with an adenoviral (Ad) BMP2. Cells were delivered in alginate (ALG) carrier or by direct injection in saline solution. Gene expression of these cells at the osteotomy site was confirmed by in vivo imaging. At day 14, only the group that received AdBMP2 stem cells by direct injection showed completely healed osteotomies, while other groups remained unhealed (P < 0.0003). In ALG groups, bone healing was impeded by the development of a chondroid mass, most pronounced in the AdBMP2 ALG group (P < 0.002). We were successful in achieving repair of both bone and cartilage in vivousing direct stem cell injection. Our data suggests that BMP2 augmentation might be critically important in achieving this effect.
authors.affiliation: Comparative Orthopedic Molecular Medicine and Applied Research Laboratories, Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Terri
authors.initials: T
authors.lastname: Zachos
authors.forename: Alisha
authors.initials: A
authors.lastname: Diggs
authors.forename: Steven
authors.initials: S
authors.lastname: Weisbrode
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Bartlett
authors.forename: Alicia
authors.initials: A
authors.lastname: Bertone
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000464:Alginates / Q000378:metabolism; D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000235:genetics / Q000378:metabolism*; D004195:Disease Models, Animal; D005260:Female; D050723:Fractures, Bone / Q000235:genetics / Q000378:metabolism* / Q000628:therapy*; D018014:Gene Transfer Techniques; D017930:Genes, Reporter / Q000235:genetics; D015316:Genetic Therapy; D020723:Glucuronic Acid / Q000235:genetics / Q000378:metabolism; D006603:Hexuronic Acids / Q000378:metabolism; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells / Q000378:metabolism*; D010027:Osteotomy; D051381:Rats; D015898:Tomography Scanners, X-Ray Computed; D016212:Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism*
chemical_list: D000464:Alginates; C525718:BMP2 protein, human; C525720:Bmp2 protein, rat; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D006603:Hexuronic Acids; D016212:Transforming Growth Factor beta; D020723:Glucuronic Acid