Departmental Papers (Dental)
Title
BMP2 Is Essential for Post Natal Osteogenesis but Not for Recruitment of Osteogenic Stem Cells
Document Type
Journal Article
Date of this Version
8-2009
Publication Source
Bone
Volume
45
Issue
2
Start Page
254
Last Page
266
DOI
10.1016/j.bone.2009.04.239
Abstract
The effects of BMP2 on bone marrow stromal cell differentiation and bone formation after bone marrow ablation were determined using C57 BL/6J (B6) mice. Inhibition of BMP2 expression with lentiviral BMP2 shRNA prevented both mineralized nodule formation in vitro and bone formation in vivo, and blocked the expression of Runx2 and osterix, transcriptional determinants of terminal osteogenic differentiation. No effect was observed on the expression of Sox9, a transcription factor, which is the one of the first transcriptional determinant to be expressed in committed chondroprogenitor and osteoprogenitor cells. In vitro studies showed that exogenously added BMP7 rescued the expression of osterix and enhanced the expression of Sox9, but had no effect on the expression of Runx2, while it only partially recovered the development of mineral deposition in the cultures. On the other hand, the exogenous addition of BMP2 rescued both Runx2 and osterix expression, did not enhance the expression of Sox9, but fully recovered the inhibition of mineral deposition in the cultures. Using antibodies against CD146 and Sox9, immunohistological examination of the cell populations found in the medullary space three days after bone marrow ablation, showed qualitatively equal numbers of cells expressing these skeletal progenitor and stem cell markers in control and BMP2 shRNA treated animals. Fluorescence Activated Cell Sorting (FACS) analysis of the cells found with the marrow cavities at three days after marrow ablation using CD146 antibody showed near equal numbers of immunopositive cells in both control and shRNA treated animals. In summary, the differences observed in vitro for BMP2 and BMP7 on osteogenic gene expression and mineralization suggest that they have differing effects on bone cell differentiation. These results further demonstrate that in vivo BMP2 is a central morphogenetic regulator of post natal osteoprogenitor differentiation, but does not affect recruitment of progenitors to the osteoblastic lineage.
Copyright/Permission Statement
NOTICE: this is the author’s version of a work that was accepted for publication in Bone. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bone, Vol 42, Issue 2, August 2009, DOI 10.1016/j.bone.2009.04.239
Keywords
BMP, Stem cells, Bone repair, Transcription factors, Osterix, Runx2
Recommended Citation
Bais, M. V., Wigner, N. A., Young, M., Toholka, R., Graves, D. T., Morgan, E., Gerstenfeld, L., & Einhorn, T. A. (2009). BMP2 Is Essential for Post Natal Osteogenesis but Not for Recruitment of Osteogenic Stem Cells. Bone, 45 (2), 254-266. http://dx.doi.org/10.1016/j.bone.2009.04.239
Included in
Amino Acids, Peptides, and Proteins Commons, Dentistry Commons, Osteopathic Medicine and Osteopathy Commons
Date Posted: 31 March 2015
This document has been peer reviewed.
Comments
At the time of publication, author Dana Graves was affiliated with Boston University School of Dental Medicine. Currently, he is a faculty member at the Penn Dental School at the University of Pennsylvania.