title: Intra-bone marrow injection of mesenchymal stem cells improves the femur bone mass of osteoporotic female rats.
abstract: The effect of intra-bone injection of differentiated rat bone marrow mesenchymal stem cells (BMMSCs) into the femur of osteoporotic female rats was studied. Osteoporosis was induced in Wistar female rats by bilateral ovariectomy. Then, 0.75 million BMMSCs isolated from healthy rats were injected into the femurs of osteoporotic rats. Histomorphometric analysis and histology clearly revealed improvements in the treated group as compared to untreated group. In 2 months, the femurs of treated rats, unlike untreated rats, showed trabecular bone percentage almost similar to the femurs from control healthy rats. To confirm the origin of newly formed bone, the experiment was repeated with BMMSCs isolated from green fluorescent protein transgenic rats. Confocal microscopy demonstrated green fluorescent protein-positive cells at the surface of trabecular bone of the treated rats. We investigated in vitro osteogenic differentiation of BMMSCs isolated from osteoporotic rats by studying alkaline phosphatase activity, collagen synthesis, and the ability to form mineralized nodules. Osteoporotic BMMSCs showed less differentiation capabilities as compared to those isolated from healthy rats. The results clearly demonstrated the importance of BMMSCs in osteoporosis and that the disease can be treated by injection of BMMSCs.
authors.affiliation: Laboratório de Patologia do Departamento de Clínica e Cirurgia Veterinárias, Escola de Veterinária da Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: Natália de Melo
authors.initials: Nde M
authors.lastname: Ocarino
authors.forename: Jankerle Neves
authors.initials: JN
authors.lastname: Boeloni
authors.forename: Vanda
authors.initials: V
authors.lastname: Jorgetti
authors.forename: Dawidson Assis
authors.initials: DA
authors.lastname: Gomes
authors.forename: Alfredo Miranda
authors.initials: AM
authors.lastname: Goes
authors.forename: Rogéria
authors.initials: R
authors.lastname: Serakides
mesh_terms: D000818:Animals; D016026:Bone Marrow Transplantation / Q000379:methods* / Q000473:pathology; D002454:Cell Differentiation / Q000502:physiology; D002478:Cells, Cultured; D004195:Disease Models, Animal; D005260:Female; D005269:Femur / Q000473:pathology / Q000502:physiology* / Q000601:surgery*; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells / Q000473:pathology / Q000502:physiology*; D010024:Osteoporosis / Q000473:pathology / Q000601:surgery*; D011897:Random Allocation; D051381:Rats; D055647:Rats, Transgenic; D017208:Rats, Wistar