Osteo-transcriptomics of human mesenchymal stem cells: accelerated gene expression and osteoblast differentiation induced by vitamin D reveals c-MYC as an enhancer of BMP2-induced osteogenesis.
Bone marrow-derived human mesenchymal stem cells (hMSCs) have the in vitro capacity to differentiate into osteoblasts, chondrocytes or adipocytes, depending on the applied stimulus. In order to identify novel regulators of osteogenesis in hMSCs, osteo-transcriptomics was performed whereby differentiation induced by dexamethasone (DEX), DEX+ bone morphogenetic protein 2 (BMP2), and DEX+ Vitamin D(3) (1,25(OH)(2)D(3)) was studied over a course of 12 days. Microarray analysis revealed that 2095 genes were significantly regulated by DEX+ 1,25(OH)(2)D(3), of which 961 showed accelerated expression kinetics compared to treatment by DEX alone. The majority of these genes were accelerated 24-48 h after onset of osteogenic treatment. Gene ontology (GO) analysis of these 1,25(OH)(2)D(3)-accelerated genes indicated their involvement in biological processes related to cellular differentiation and cell cycle regulation. When compared to cells treated with DEX or DEX+BMP2, treatment with DEX+ 1,25(OH)(2)D(3) clearly accelerated osteoprogenitor commitment and osteoblast maturation, as measured by alkaline phosphatase (ALP) activity and calcification of the matrix. Cell cycle progression, as observed after initial growth arrest, was not significantly accelerated by 1,25(OH)(2)D(3) and was not required for onset and progression of osteogenesis. However, expression of c-Myc was accelerated by 1,25(OH)(2)D(3), and binding sites for c-MYC were enriched in promoters of genes accelerated by 1,25(OH)(2)D(3). Lentiviral overexpression of c-MYC strongly promoted DEX+ BMP2-induced osteoblast differentiation and matrix maturation. In conclusion, our studies show for the first time that 1,25(OH)(2)D(3) strongly accelerates expression of genes involved in differentiation of hMSCs and, moreover, identify c-MYC as a novel regulator of osteogenesis.
Department of Applied Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands. e.piek@science.ru.nl
Ester
E
Piek
Laura S
LS
Sleumer
Eugene P
EP
van Someren
Leonie
L
Heuver
Jorn R
JR
de Haan
Ingrid
I
de Grijs
Christian
C
Gilissen
José M
JM
Hendriks
Roselinde I
RI
van Ravestein-van Os
Susanne
S
Bauerschmidt
Koen J
KJ
Dechering
Everardus J
EJ
van Zoelen
D055396:Bone Morphogenetic Protein 2 / Q000235:genetics / Q000502:physiology*; D002113:Calcification, Physiologic / Q000235:genetics; D002454:Cell Differentiation / Q000235:genetics*; D002478:Cells, Cultured; D020869:Gene Expression Profiling / Q000379:methods; D005786:Gene Expression Regulation / Q000502:physiology; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000378:metabolism* / Q000502:physiology; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism* / Q000502:physiology; D010012:Osteogenesis / Q000235:genetics*; D016271:Proto-Oncogene Proteins c-myc / Q000096:biosynthesis / Q000502:physiology*; D015854:Up-Regulation / Q000235:genetics; D014807:Vitamin D / Q000502:physiology*
D055396:Bone Morphogenetic Protein 2; C489427:MYC protein, human; D016271:Proto-Oncogene Proteins c-myc; D014807:Vitamin D