title: Dexamethasone modulates BMP-2 effects on mesenchymal stem cells in vitro.
abstract: Dexamethasone/ascorbic acid/glycerolphosphate (DAG) and bone morphogenic protein (BMP)-2 are potent agents in cell proliferation and differentiation pathways. This study investigates the in vitro interactions between dexamethasone and BMP-2 for an osteoblastic differentiation of mesenchymal stem cells (MSCs). Bone marrow-derived human MSCs were cultured with DAG (group A), BMP-2 + DAG (group B), and DAG + BMP-2 combined with a porous collagen I/III scaffold (group C). RT-PCR, ELISA, immuncytochemical stainings and flow cytometry analysis served to evaluate the osteogenic-promoting potency of each of the above conditions in terms of cell morphology/viability, antigen presentation, and gene expression. DAG induced collagen I secretion from MSCs, which was further increased by the combination of DAG + BMP-2. In comparison, the collagen scaffold and the control samples showed no significant influence on collagen I secretion of MSCs. DAG stimulation of MSCs led also to a steady but not significant increase of BMP-2 level. A DAG and more, a DAG + BMP-2, stimulation increased the number of mesenchymal cells (CD105+/CD73+). All samples showed mRNA of ALP, osteopontin, Runx2, Twist 1 and 2, Notch-1/2, osteonectin, osteocalcin, BSP, and collagen-A1 after 28 days of in vitro culture. Culture media of all samples showed a decrease in Ca(2+) and PO(4) (2-) concentration, whereas a collagen-I-peak only occurred at day 28 in DAG- and DAG + BMP-2-stimulated bone marrow cells. In conclusion, BMP-2 enhances DAG-induced osteogenic differentiation in mesenchymal bone marrow cells. Both agents interact in various ways and can modify osteoblastic bone formation.
authors.affiliation: Research Laboratory for Regenerative Medicine and Biomaterials, Department of Orthopaedics, Heinrich-Heine University Medical School, Moorenstr. 5, D-40225 Düsseldorf, Germany. jaeger@med.uni-duesseldorf.de
authors.forename: Marcus
authors.initials: M
authors.lastname: Jäger
authors.forename: Johannes
authors.initials: J
authors.lastname: Fischer
authors.forename: Wiebke
authors.initials: W
authors.lastname: Dohrn
authors.forename: Xinning
authors.initials: X
authors.lastname: Li
authors.forename: David C
authors.initials: DC
authors.lastname: Ayers
authors.forename: Akos
authors.initials: A
authors.lastname: Czibere
authors.forename: Wolf Christian
authors.initials: WC
authors.lastname: Prall
authors.forename: Sabine
authors.initials: S
authors.lastname: Lensing-Höhn
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Krauspe
mesh_terms: D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D015415:Biomarkers / Q000378:metabolism; D001854:Bone Marrow Cells; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000378:metabolism / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D024042:Collagen Type I / Q000235:genetics / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology*; D004338:Drug Combinations; D019084:Fluorescent Antibody Technique, Indirect; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007124:Immunoenzyme Techniques; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D053495:Osteopontin / Q000235:genetics / Q000378:metabolism; D053245:RANK Ligand / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D000893:Anti-Inflammatory Agents; C525718:BMP2 protein, human; D015415:Biomarkers; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D024042:Collagen Type I; D004338:Drug Combinations; D053245:RANK Ligand; D012333:RNA, Messenger; C505688:TNFSF11 protein, human; D016212:Transforming Growth Factor beta; D053495:Osteopontin; D003907:Dexamethasone