Establishment of Immortalized BMP2/4 Double Knock‐Out Osteoblastic Cells Is Essential for Study of Osteoblast Growth,Differentiation, and Osteogenesis |
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| Authors: | Li‐An Wu Feng Wang Kevin J Donly Andrew Baker Chunyan Wan Daoshu Luo Mary MacDougall Shuo Chen |
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| Institution: | 1. Department of Developmental Dentistry, The University of Texas Health Science Center at San Antonio, Texas;2. Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi‐an, China;3. Department of Anatomy, Histology & Embryology, Basic Medical College, Fujian Medical University, Fuzhou, China;4. Department of Oral/Maxillofacial Surgery, University of Alabama at Birmingham, School of Dentistry, Birmingham, Alabama |
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| Abstract: | Bone morphogenetic proteins 2 and 4 (BMP2/4) are essential for osteoblast differentiation and osteogenesis. Generation of a BMP2/4 dual knock‐out (ko/ko) osteoblastic cell line is a valuable asset for studying effects of BMP2/4 on skeletal development. In this study, our goal was to create immortalized mouse deleted BMP2/4 osteoblasts by infecting adenoviruses with Cre recombinase and green fluorescent protein genes into immortalized murine floxed BMP2/4 osteoblasts. Transduced BMP2/4ko/ko cells were verified by green immunofluorescence and PCR. BMP2/4ko/ko osteoblasts exhibited small size, slow cell proliferation rate and cell growth was arrested in G1 and G2 phases. Expression of bone‐relate genes was reduced in the BMP2/4ko/ko cells, resulting in delay of cell differentiation and mineralization. Importantly, extracellular matrix remodeling was impaired in the BMP2/4ko/ko osteoblasts as reflected by decreased Mmp‐2 and Mmp‐9 expressions. Cell differentiation and mineralization were rescued by exogenous BMP2 and/or BMP4. Therefore, we for the first time described establishment of an immortalized deleted BMP2/4 osteoblast line useful for study of mechanisms in regulating osteoblast lineages. J. Cell. Physiol. 231: 1189–1198, 2016. © 2015 The Authors. Journal of Cellular Physiology Published by Wiley Periodicals, Inc. |
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