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Jaabar IL, Foley B, Mezzetti A, Pillier F, Berenbaum F, Landoulsi J, Houard X. Unraveling the Mechanisms of Hypertrophy-Induced Matrix Mineralization and Modifications in Articular Chondrocytes. Calcif Tissue Int 2024:10.1007/s00223-024-01229-w. [PMID: 38918254 DOI: 10.1007/s00223-024-01229-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 05/12/2024] [Indexed: 06/27/2024]
Abstract
Chondrocyte hypertrophic differentiation is a main event leading to articular cartilage degradation in osteoarthritis. It is associated with matrix remodeling and mineralization, the dynamics of which is not well characterized during chondrocyte hypertrophic differentiation in articular cartilage. Based on an in vitro model of progressive differentiation of immature murine articular chondrocytes (iMACs) into prehypertrophic (Prehyp) and hypertrophic (Hyp) chondrocytes, we performed kinetics of chondrocyte differentiation from Prehyp to Hyp to follow matrix mineralization and remodeling by immunofluorescence, biochemical, molecular, and physicochemical approaches, including atomic force microscopy, scanning electron microscopy associated with energy-dispersive X-ray spectroscopy (SEM-EDS), attenuated total reflection infrared analyses, and X-ray diffraction. Chondrocyte apoptosis was determined by TUNEL assay. The results show the formation of a mineral phase 7 days after Hyp induction, which spreads within the matrices to form poorly crystalline carbonate-substituted hydroxyapatite after 14 days, then the proportions of crystalline relative to amorphous content increases over time. Hyp differentiation also induced a matrix turnover that occurs over the first 7 days, characterized by a decrease in type II collagen and aggrecan and the concomitant appearance of type X collagen. This is accompanied by an increase in the enzymatic activity of MMP-13, the main collagenase in cartilage. The number of apoptotic chondrocytes slightly increased with Hyp differentiation and SEM-EDS analyses detected phosphorus-rich structures that could correspond to apoptotic bodies. Our findings highlight the mechanisms of matrix remodeling events leading to the mineralization of articular cartilage that may occur in osteoarthritis.
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Affiliation(s)
- Ilhem Lilia Jaabar
- Laboratoire de Réactivité de Surface, LRS, CNRS, Sorbonne Université, 4, Place Jussieu, 75005, Paris, France
- INSERM, Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, 34 Rue Crozatier, 75012, Paris, France
| | - Brittany Foley
- Laboratoire de Réactivité de Surface, LRS, CNRS, Sorbonne Université, 4, Place Jussieu, 75005, Paris, France
- Laboratoire de Biomécanique & Bioingénierie, CNRS, Université de Technologie de Compiègne, BP 20529, 60205, Compiègne Cedex, France
| | - Alberto Mezzetti
- Laboratoire de Réactivité de Surface, LRS, CNRS, Sorbonne Université, 4, Place Jussieu, 75005, Paris, France
| | - Françoise Pillier
- Laboratoire Interfaces et Systèmes Electrochimiques, LISE, CNRS,, Sorbonne Université, 75012, Paris, France
| | - Francis Berenbaum
- INSERM, Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, 34 Rue Crozatier, 75012, Paris, France
- Rheumatology Department, AP-HP Saint-Antoine Hospital, 184, Rue du Faubourg Saint-Antoine, 75012, Paris, France
| | - Jessem Landoulsi
- Laboratoire de Réactivité de Surface, LRS, CNRS, Sorbonne Université, 4, Place Jussieu, 75005, Paris, France.
| | - Xavier Houard
- INSERM, Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, 34 Rue Crozatier, 75012, Paris, France.
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Liu YL, Tang XT, Shu HS, Zou W, Zhou BO. Fibrous periosteum repairs bone fracture and maintains the healed bone throughout mouse adulthood. Dev Cell 2024; 59:1192-1209.e6. [PMID: 38554700 DOI: 10.1016/j.devcel.2024.03.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 12/07/2023] [Accepted: 03/06/2024] [Indexed: 04/02/2024]
Abstract
Bone is regarded as one of few tissues that heals without fibrous scar. The outer layer of the periosteum is covered with fibrous tissue, whose function in bone formation is unknown. We herein developed a system to distinguish the fate of fibrous-layer periosteal cells (FL-PCs) from the skeletal stem/progenitor cells (SSPCs) in the cambium-layer periosteum and bone marrow in mice. We showed that FL-PCs did not participate in steady-state osteogenesis, but formed the main body of fibrocartilaginous callus during fracture healing. Moreover, FL-PCs invaded the cambium-layer periosteum and bone marrow after fracture, forming neo-SSPCs that continued to maintain the healed bones throughout adulthood. The FL-PC-derived neo-SSPCs expressed lower levels of osteogenic signature genes and displayed lower osteogenic differentiation activity than the preexisting SSPCs. Consistent with this, healed bones were thinner and formed more slowly than normal bones. Thus, the fibrous periosteum becomes the cellular origin of bones after fracture and alters bone properties permanently.
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Affiliation(s)
- Yiming Liam Liu
- Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Xinyu Thomas Tang
- Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Hui Sophie Shu
- Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China
| | - Weiguo Zou
- Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; Key Laboratory of RNA Science and Engineering, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China.
| | - Bo O Zhou
- Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai 200031, China; State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin 300020, China.
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3
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Tan WH, Rücklin M, Larionova D, Ngoc TB, Joan van Heuven B, Marone F, Matsudaira P, Winkler C. A Collagen10a1 mutation disrupts cell polarity in a medaka model for metaphyseal chondrodysplasia type Schmid. iScience 2024; 27:109405. [PMID: 38510140 PMCID: PMC10952040 DOI: 10.1016/j.isci.2024.109405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/21/2023] [Accepted: 02/29/2024] [Indexed: 03/22/2024] Open
Abstract
Heterozygous mutations in COL10A1 lead to metaphyseal chondrodysplasia type Schmid (MCDS), a skeletal disorder characterized by epiphyseal abnormalities. Prior analysis revealed impaired trimerization and intracellular retention of mutant collagen type X alpha 1 chains as cause for elevated endoplasmic reticulum (ER) stress. However, how ER stress translates into structural defects remained unclear. We generated a medaka (Oryzias latipes) MCDS model harboring a 5 base pair deletion in col10a1, which led to a frameshift and disruption of 11 amino acids in the conserved trimerization domain. col10a1Δ633a heterozygotes recapitulated key features of MCDS and revealed early cell polarity defects as cause for dysregulated matrix secretion and deformed skeletal structures. Carbamazepine, an ER stress-reducing drug, rescued this polarity impairment and alleviated skeletal defects in col10a1Δ633a heterozygotes. Our data imply cell polarity dysregulation as a potential contributor to MCDS and suggest the col10a1Δ633a medaka mutant as an attractive MCDS animal model for drug screening.
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Affiliation(s)
- Wen Hui Tan
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, Singapore 117543, Singapore
| | - Martin Rücklin
- Naturalis Biodiversity Center, Postbus 9517, 2300 RA Leiden, the Netherlands
| | - Daria Larionova
- Department of Biology, Research Group Evolutionary Developmental Biology, Ghent University, Ghent, Belgium
| | - Tran Bich Ngoc
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, Singapore 117543, Singapore
| | | | - Federica Marone
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Paul Matsudaira
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, Singapore 117543, Singapore
| | - Christoph Winkler
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, Singapore 117543, Singapore
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4
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Chen N, Wu RW, Lam Y, Chan WC, Chan D. Hypertrophic chondrocytes at the junction of musculoskeletal structures. Bone Rep 2023; 19:101698. [PMID: 37485234 PMCID: PMC10359737 DOI: 10.1016/j.bonr.2023.101698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 06/12/2023] [Accepted: 07/01/2023] [Indexed: 07/25/2023] Open
Abstract
Hypertrophic chondrocytes are found at unique locations at the junction of skeletal tissues, cartilage growth plate, articular cartilage, enthesis and intervertebral discs. Their role in the skeleton is best understood in the process of endochondral ossification in development and bone fracture healing. Chondrocyte hypertrophy occurs in degenerative conditions such as osteoarthritis. Thus, the role of hypertrophic chondrocytes in skeletal biology and pathology is context dependent. This review will focus on hypertrophic chondrocytes in endochondral ossification, in which they exist in a transient state, but acting as a central regulator of differentiation, mineralization, vascularization and conversion to bone. The amazing journey of a chondrocyte from being entrapped in the extracellular matrix environment to becoming proliferative then hypertrophic will be discussed. Recent studies on the dynamic changes and plasticity of hypertrophic chondrocytes have provided new insights into how we view these cells, not as terminally differentiated but as cells that can dedifferentiate to more progenitor-like cells in a transition to osteoblasts and adipocytes, as well as a source of skeletal stem and progenitor cells residing in the bone marrow. This will provide a foundation for studies of hypertrophic chondrocytes at other skeletal sites in development, tissue maintenance, pathology and therapy.
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Affiliation(s)
- Ning Chen
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China
| | - Robin W.H. Wu
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China
| | - Yan Lam
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China
| | - Wilson C.W. Chan
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China
- Department of Orthopaedics Surgery and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen 518053, China
| | - Danny Chan
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China
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Long JT, Leinroth A, Liao Y, Ren Y, Mirando AJ, Nguyen T, Guo W, Sharma D, Rouse D, Wu C, Cheah KSE, Karner CM, Hilton MJ. Hypertrophic chondrocytes serve as a reservoir for marrow associated skeletal stem and progenitor cells, osteoblasts, and adipocytes during skeletal development. eLife 2022; 11:76932. [PMID: 35179487 PMCID: PMC8893718 DOI: 10.7554/elife.76932] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/13/2022] [Indexed: 11/26/2022] Open
Abstract
Hypertrophic chondrocytes give rise to osteoblasts during skeletal development; however, the process by which these non-mitotic cells make this transition is not well understood. Prior studies have also suggested that skeletal stem and progenitor cells (SSPCs) localize to the surrounding periosteum and serve as a major source of marrow-associated SSPCs, osteoblasts, osteocytes, and adipocytes during skeletal development. To further understand the cell transition process by which hypertrophic chondrocytes contribute to osteoblasts or other marrow associated cells, we utilized inducible and constitutive hypertrophic chondrocyte lineage tracing and reporter mouse models (Col10a1CreERT2; Rosa26fs-tdTomato and Col10a1Cre; Rosa26fs-tdTomato) in combination with a PDGFRaH2B-GFP transgenic line, single-cell RNA-sequencing, bulk RNA-sequencing, immunofluorescence staining, and cell transplantation assays. Our data demonstrate that hypertrophic chondrocytes undergo a process of dedifferentiation to generate marrow-associated SSPCs that serve as a primary source of osteoblasts during skeletal development. These hypertrophic chondrocyte-derived SSPCs commit to a CXCL12-abundant reticular (CAR) cell phenotype during skeletal development and demonstrate unique abilities to recruit vasculature and promote bone marrow establishment, while also contributing to the adipogenic lineage.
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Affiliation(s)
- Jason T Long
- Department of Cell Biology, Duke University School of Medicine, Durham, United States
| | - Abigail Leinroth
- Department of Cell Biology, Duke University School of Medicine, Durham, United States
| | - Yihan Liao
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, United States
| | - Yinshi Ren
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, United States
| | - Anthony J Mirando
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, United States
| | - Tuyet Nguyen
- Program of Developmental and Stem Cell Biology, Duke University School of Medicine, Durham, United States
| | - Wendi Guo
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, United States
| | - Deepika Sharma
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, United States
| | - Douglas Rouse
- Division of Laboratory Animal Resources, Duke University School of Medicine, Durham, United States
| | - Colleen Wu
- Department of Cell Biology, Duke University School of Medicine, Durham, United States
| | | | - Courtney M Karner
- Department of Cell Biology, Duke University School of Medicine, Durham, United States
| | - Matthew J Hilton
- Department of Cell Biology, Duke University School of Medicine, Durham, United States
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Tschaffon MEA, Reber SO, Schoppa A, Nandi S, Cirstea IC, Aszodi A, Ignatius A, Haffner-Luntzer M. A novel in vitro assay to study chondrocyte-to-osteoblast transdifferentiation. Endocrine 2022; 75:266-275. [PMID: 34529238 PMCID: PMC8763722 DOI: 10.1007/s12020-021-02853-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 08/14/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE Endochondral ossification, which involves transdifferentiation of chondrocytes into osteoblasts, is an important process involved in the development and postnatal growth of most vertebrate bones as well as in bone fracture healing. To study the basic molecular mechanisms of this process, a robust and easy-to-use in vitro model is desirable. Therefore, we aimed to develop a standardized in vitro assay for the transdifferentiation of chondrogenic cells towards the osteogenic lineage. METHODS Murine chondrogenic ATDC5 cells were differentiated into the chondrogenic lineage for seven days and subsequently differentiated towards the osteogenic direction. Gene expression analysis of pluripotency, as well as chondrogenic and osteogenic markers, cell-matrix staining, and immunofluorescent staining, were performed to assess the differentiation. In addition, the effects of Wnt3a and lipopolysaccharides (LPS) on the transdifferentiation were tested by their addition to the osteogenic differentiation medium. RESULTS Following osteogenic differentiation, chondrogenically pe-differentiated cells displayed the expression of pluripotency and osteogenic marker genes as well as alkaline phosphatase activity and a mineralized matrix. Co-expression of Col2a1 and Col1a1 after one day of osteogenic differentiation indicated that osteogenic cells had differentiated from chondrogenic cells. Wnt3a increased and LPS decreased transdifferentiation towards the osteogenic lineage. CONCLUSION We successfully established a rapid, standardized in vitro assay for the transdifferentiation of chondrogenic cells into osteogenic cells, which is suitable for testing the effects of different compounds on this cellular process.
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Affiliation(s)
- Miriam E A Tschaffon
- Institute of Orthopedic Research and Biomechanics, University Medical Center Ulm, Ulm, Germany
| | - Stefan O Reber
- Laboratory for Molecular Psychosomatics, Department of Psychosomatic Medicine and Psychotherapy, University of Ulm, Ulm, Germany
| | - Astrid Schoppa
- Institute of Orthopedic Research and Biomechanics, University Medical Center Ulm, Ulm, Germany
| | - Sayantan Nandi
- Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Ion C Cirstea
- Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Attila Aszodi
- Laboratory of Experimental Surgery and Regenerative Medicine, Clinic for General, Trauma and Reconstructive Surgery, Klinikum der Universität München, Martinsried, Germany
| | - Anita Ignatius
- Institute of Orthopedic Research and Biomechanics, University Medical Center Ulm, Ulm, Germany
| | - Melanie Haffner-Luntzer
- Institute of Orthopedic Research and Biomechanics, University Medical Center Ulm, Ulm, Germany.
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Zfhx4 regulates endochondral ossification as the transcriptional platform of Osterix in mice. Commun Biol 2021; 4:1258. [PMID: 34732852 PMCID: PMC8566502 DOI: 10.1038/s42003-021-02793-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 10/18/2021] [Indexed: 11/08/2022] Open
Abstract
Endochondral ossification is regulated by transcription factors that include SRY-box transcription factor 9, runt-related protein 2 (Runx2), and Osterix. However, the sequential and harmonious regulation of the multiple steps of endochondral ossification is unclear. This study identified zinc finger homeodomain 4 (Zfhx4) as a crucial transcriptional partner of Osterix. We found that Zfhx4 was highly expressed in cartilage and that Zfhx4 deficient mice had reduced expression of matrix metallopeptidase 13 and inhibited calcification of cartilage matrices. These phenotypes were very similar to impaired chondrogenesis in Osterix deficient mice. Coimmunoprecipitation and immunofluorescence indicated a physical interaction between Zfhx4 and Osterix. Notably, Zfhx4 and Osterix double mutant mice showed more severe phenotype than Zfhx4 deficient mice. Additionally, Zfhx4 interacted with Runx2 that functions upstream of Osterix. Our findings suggest that Zfhx4 coordinates the transcriptional network of Osterix and, consequently, endochondral ossification.
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Dai B, Li Q, Song X, Ge Y, Wu J, Zhang K, Wang C, Zhang Y, Teng H, Li C, Jiang Q. Knockdown of Ggps1 in chondrocyte expedites fracture healing by accelerating the progression of endochondral ossification in mice. J Bone Miner Metab 2018; 36:133-147. [PMID: 28357594 DOI: 10.1007/s00774-017-0824-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Accepted: 02/11/2017] [Indexed: 12/12/2022]
Abstract
Bone fracture healing is achieved through the proliferation and differentiation of stem cells, while bone marrow stem cells (BMSCs) contribute to endochondral ossification. During fracture healing, mesenchymal progenitor cells first form a cartilaginous blastema that becomes vascularized to recruit precursor cells of osteoblasts through the bone morphogenetic protein 2 (Bmp2)/Smad-dependent Runx2 pathway. Statins deplete geranylgeranyl diphosphate (GGPP), which participates in the regulation of BMSCs differentiation, through the inhibition of 3-hydroxy-3-methylglutaryl (HMG)-CoA reductase, leading to impaired protein geranylgeranylation, which strongly impacts the bone synthesis induced by Bmp2. Accordingly, we would like to investigate the role of geranylgeranyl diphosphate synthase 1 (Ggps1) in bone fracture via endochondral ossification in mice. We used a Cre-loxP system, namely the tamoxifen-inducible Collagen 2-CreERT2 Ggps1 fl/fl, to eliminate specifically the Ggps1 activity in chondrocytes of 8-10-week-old mice. We found that the endochondral bone formation, calcification and vasculogenesis of the bony callus were accelerated in fractures in Ggps1-/-mice. Together, the results of this study confirm that the specific deletion of Ggps1, using the Collagen 2-CreERT2 mice, will accelerate the fracture healing process by activating the Bmp2/Smad-dependent Runx2 pathway. In addition, we managed to improve the fracture healing process by inhibiting the Ggps1 activity and its related products with statin drugs.
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Affiliation(s)
- Bingyang Dai
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China
| | - Qiangqiang Li
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, Clinical College of Nanjing Medical University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
| | - Xiaoxiao Song
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China
| | - Yuxiang Ge
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China
| | - Jing Wu
- The School of Medicine, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Kaijia Zhang
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China
| | - Chao Wang
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China
| | - Yifeng Zhang
- The School of Medicine, Nanjing University, Nanjing, 210093, People's Republic of China
| | - Huajian Teng
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China.
| | - Chaojun Li
- MOE Key Laboratory of Model Animals for Disease Study, Model Animal Research Center (MARC) and the School of Medicine, Nanjing University, Nanjing, 210093, People's Republic of China.
| | - Qing Jiang
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, School of Medicine, Nanjing University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China.
- Laboratory for Bone and Joint Diseases, Model Animal Research Center, Nanjing University, Nanjing, 210093, Jiangsu, People's Republic of China.
- Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital, Clinical College of Nanjing Medical University, 321 Zhongshan Road, Nanjing, 210008, Jiangsu, People's Republic of China.
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9
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Hypertrophic chondrocytes can become osteoblasts and osteocytes in endochondral bone formation. Proc Natl Acad Sci U S A 2014; 111:12097-102. [PMID: 25092332 DOI: 10.1073/pnas.1302703111] [Citation(s) in RCA: 496] [Impact Index Per Article: 49.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
According to current dogma, chondrocytes and osteoblasts are considered independent lineages derived from a common osteochondroprogenitor. In endochondral bone formation, chondrocytes undergo a series of differentiation steps to form the growth plate, and it generally is accepted that death is the ultimate fate of terminally differentiated hypertrophic chondrocytes (HCs). Osteoblasts, accompanying vascular invasion, lay down endochondral bone to replace cartilage. However, whether an HC can become an osteoblast and contribute to the full osteogenic lineage has been the subject of a century-long debate. Here we use a cell-specific tamoxifen-inducible genetic recombination approach to track the fate of murine HCs and show that they can survive the cartilage-to-bone transition and become osteogenic cells in fetal and postnatal endochondral bones and persist into adulthood. This discovery of a chondrocyte-to-osteoblast lineage continuum revises concepts of the ontogeny of osteoblasts, with implications for the control of bone homeostasis and the interpretation of the underlying pathological bases of bone disorders.
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Probst S, Zeller R, Zuniga A. The hedgehog target Vlk genetically interacts with Gli3 to regulate chondrocyte differentiation during mouse long bone development. Differentiation 2013; 85:121-30. [PMID: 23792766 DOI: 10.1016/j.diff.2013.03.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 02/08/2013] [Accepted: 03/05/2013] [Indexed: 10/26/2022]
Abstract
Endochondral bone development is orchestrated by the spatially and temporally coordinated differentiation of chondrocytes along the longitudinal axis of the cartilage anlage. Initially, the slowly proliferating, periarticular chondrocytes give rise to the pool of rapidly dividing columnar chondrocytes, whose expansion determines the length of the long bones. The Indian hedgehog (IHH) ligand regulates both the proliferation of columnar chondrocytes and their differentiation into post-mitotic hypertrophic chondrocytes in concert with GLI3, one of the main transcriptional effectors of HH signal transduction. In the absence of Hh signalling, the expression of Vlk (vertebrate lonesome kinase, also called Pkdcc) is increased. We now show that the shortening of limb long bones in Vlk-deficient mouse embryos is aggravated by additional inactivation of Gli3. Our analysis establishes that Vlk and Gli3 synergize to control the temporal kinetics of chondrocyte differentiation during long bone development. Whereas differentiation of limb mesenchymal progenitors into chondrocytes and the initial formation of the cartilage anlagen of the limb skeleton are not altered, Vlk and Gli3 are required for the temporally coordinated differentiation of periarticular into columnar and ultimately hypertrophic chondrocytes in long bones. In limbs lacking both Vlk and Gli3, the appearance of columnar and hypertrophic chondrocytes is severely delayed and zones of morphologically distinct chondrocytes are not established until E16.5. At the molecular level, these morphological alterations are reflected by delayed activation and lowered expression of Ihh, Pth1r and Col10a1 in long bone rudiments of double mutant limbs. In summary, our genetic analysis establishes that VLK plays a role in the IHH/GLI3 interactions and that Vlk and Gli3 cooperate to regulate long bone development by modulating the temporal kinetics of establishing columnar and hypertrophic chondrocyte domains.
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Affiliation(s)
- Simone Probst
- Developmental Genetics, Department of Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland
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11
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Abstract
Nell-1, first identified by its overexpression in synostotic cranial sutures, is a novel osteoinductive growth and differentiation factor. To further define Nell-1's role in craniofacial patterning, we characterized defects of the ENU-induced Nell-1-deficient (END) mice, focusing on both intramembranous and endochondral cranial bones. Results showed that calvarial bones of neonatal END mice were reduced in thickness and density, with a phenotype resembling calvarial cleidocraniodysplasia. In addition, a global reduction in osteoblast markers was observed, including reductions in Runx2, alkaline phosphatase, and osteocalcin. Remarkably, detailed analysis of endochondral bones showed dysplasia as well. The chondrocranium in the END mouse showed enrichment for early, proliferating Sox9⁺ chondrocytes, whereas in contrast markers of chondrocytes maturation were reduced. These data suggest that Nell-1 is an important growth factor for regulation of osteochondral differentiation, by regulating both Runx2 and Sox9 expression within the calvarium. In summary, Nell-1 is required for normal craniofacial membranous and endochondral skeletal development.
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12
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Leung VYL, Gao B, Leung KKH, Melhado IG, Wynn SL, Au TYK, Dung NWF, Lau JYB, Mak ACY, Chan D, Cheah KSE. SOX9 governs differentiation stage-specific gene expression in growth plate chondrocytes via direct concomitant transactivation and repression. PLoS Genet 2011; 7:e1002356. [PMID: 22072985 PMCID: PMC3207907 DOI: 10.1371/journal.pgen.1002356] [Citation(s) in RCA: 156] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2010] [Accepted: 09/10/2011] [Indexed: 01/18/2023] Open
Abstract
Cartilage and endochondral bone development require SOX9 activity to regulate chondrogenesis, chondrocyte proliferation, and transition to a non-mitotic hypertrophic state. The restricted and reciprocal expression of the collagen X gene, Col10a1, in hypertrophic chondrocytes and Sox9 in immature chondrocytes epitomise the precise spatiotemporal control of gene expression as chondrocytes progress through phases of differentiation, but how this is achieved is not clear. Here, we have identified a regulatory element upstream of Col10a1 that enhances its expression in hypertrophic chondrocytes in vivo. In immature chondrocytes, where Col10a1 is not expressed, SOX9 interacts with a conserved sequence within this element that is analogous to that within the intronic enhancer of the collagen II gene Col2a1, the known transactivation target of SOX9. By analysing a series of Col10a1 reporter genes in transgenic mice, we show that the SOX9 binding consensus in this element is required to repress expression of the transgene in non-hypertrophic chondrocytes. Forced ectopic Sox9 expression in hypertrophic chondrocytes in vitro and in mice resulted in down-regulation of Col10a1. Mutation of a binding consensus motif for GLI transcription factors, which are the effectors of Indian hedgehog signaling, close to the SOX9 site in the Col10a1 regulatory element, also derepressed transgene expression in non-hypertrophic chondrocytes. GLI2 and GLI3 bound to the Col10a1 regulatory element but not to the enhancer of Col2a1. In addition to Col10a1, paired SOX9-GLI binding motifs are present in the conserved non-coding regions of several genes that are preferentially expressed in hypertrophic chondrocytes and the occurrence of pairing is unlikely to be by chance. We propose a regulatory paradigm whereby direct concomitant positive and negative transcriptional control by SOX9 ensures differentiation phase-specific gene expression in chondrocytes. Discrimination between these opposing modes of transcriptional control by SOX9 may be mediated by cooperation with different partners such as GLI factors.
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Affiliation(s)
- Victor Y. L. Leung
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- Centre for Reproduction, Development, and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Bo Gao
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Keith K. H. Leung
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- Centre for Reproduction, Development, and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Ian G. Melhado
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Sarah L. Wynn
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Tiffany Y. K. Au
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Nelson W. F. Dung
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - James Y. B. Lau
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Angel C. Y. Mak
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Danny Chan
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- Centre for Reproduction, Development, and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Kathryn S. E. Cheah
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- Centre for Reproduction, Development, and Growth, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- * E-mail:
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Gredes T, Mack H, Spassov A, Kunert-Keil C, Steele M, Proff P, Mack F, Gedrange T. Changes in condylar cartilage after anterior mandibular displacement in juvenile pigs. Arch Oral Biol 2011; 57:594-8. [PMID: 22041020 DOI: 10.1016/j.archoralbio.2011.09.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 09/21/2011] [Accepted: 09/30/2011] [Indexed: 10/15/2022]
Abstract
UNLABELLED Adaptive remodelling of the mandibular condyle in response to mandibular advancement is the mechanism exploited by orthodontic forward displacement devices. OBJECTIVE This work investigated the expression of collagens, matrix metalloproteinases and vascular endothelial growth factor during this process. DESIGN Twenty juvenile pigs were randomly divided into two experimental groups, where the treatment group was fitted with mandibular advancement splints, and the control group was not. Changes in the mRNA content of condylar cartilage tissue was then were measured by real-time PCR using specific primers after 4weeks of treatment. RESULTS The temporal pattern of the expression of Col1 and MMP13 during condylar adaptation coincided with that during natural condylar growth. The amount of the expression of Col10 during condylar adaptation was significantly lower (p<0.05), whereas the expression of Col2, MMP8 and VEGF was significantly higher compared to natural growth (p<0.05). CONCLUSIONS It is suggested that condylar adaptation in growing pigs triggered by mandibular forward positioning results not only from passive adaptation of cartilage, but also involves growth affected processes. Our results showed that mechanical strain produced by mandibular advancement induced remodelling and revascularization in the posteriocranial mandibular condyle. These results are mostly consistent with former published histological and histomorphometrical analyses.
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Affiliation(s)
- Tomasz Gredes
- Department of Orthodontics, Faculty of Medicine, University of Greifswald, Greifswald, Germany.
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García-Sancho M. Academic and molecular matrices: a study of the transformations of connective tissue research at the University of Manchester (1947-1996). STUDIES IN HISTORY AND PHILOSOPHY OF BIOLOGICAL AND BIOMEDICAL SCIENCES 2011; 42:233-45. [PMID: 21486662 PMCID: PMC3677089 DOI: 10.1016/j.shpsc.2010.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2009] [Revised: 09/17/2010] [Indexed: 05/30/2023]
Abstract
This paper explores the different identities adopted by connective tissue research at the University of Manchester during the second half of the 20th century. By looking at the long-term redefinition of a research programme, it sheds new light on the interactions between different and conflicting levels in the study of biomedicine, such as the local and the global, or the medical and the biological. It also addresses the gap in the literature between the first biomedical complexes after World War II and the emergence of biotechnology. Connective tissue research in Manchester emerged as a field focused on new treatments for rheumatic diseases. During the 1950s and 60s, it absorbed a number of laboratory techniques from biology, namely cell culture and electron microscopy. The transformations in scientific policy during the late 70s and the migration of Manchester researchers to the US led them to adopt recombinant DNA methods, which were borrowed from human genetics. This resulted in the emergence of cell matrix biology, a new field which had one of its reference centres in Manchester. The Manchester story shows the potential of detailed and chronologically wide local studies of patterns of work to understand the mechanisms by which new biomedical tools and institutions interact with long-standing problems and existing affiliations.
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Affiliation(s)
- Miguel García-Sancho
- Department of Science, Technology and Society, Spanish National Research Council (CSIC), Calle Albasanz, 26-28, 28037 Madrid, Spain.
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Tan JT, Kremer F, Freddi S, Bell KM, Baker NL, Lamandé SR, Bateman JF. Competency for nonsense-mediated reduction in collagen X mRNA is specified by the 3' UTR and corresponds to the position of mutations in Schmid metaphyseal chondrodysplasia. Am J Hum Genet 2008; 82:786-93. [PMID: 18304492 DOI: 10.1016/j.ajhg.2008.01.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 12/10/2007] [Accepted: 01/07/2008] [Indexed: 12/31/2022] Open
Abstract
Nonsense-mediated decay (NMD) is a eukaryotic cellular RNA surveillance and quality-control mechanism that degrades mRNA containing premature stop codons (nonsense mutations) that otherwise may exert a deleterious effect by the production of dysfunctional truncated proteins. Collagen X (COL10A1) nonsense mutations in Schmid-type metaphyseal chondrodysplasia are localized in a region toward the 3' end of the last exon (exon 3) and result in mRNA decay, in contrast to most other genes in which terminal-exon nonsense mutations are resistant to NMD. We introduce nonsense mutations into the mouse Col10a1 gene and express these in a hypertrophic-chondrocyte cell line to explore the mechanism of last-exon mRNA decay of Col10a1 and demonstrate that mRNA decay is spatially restricted to mutations occurring in a 3' region of the exon 3 coding sequence; this region corresponds to where human mutations have been described. This localization of mRNA-decay competency suggested that a downstream region, such as the 3' UTR, may play a role in specifying decay of mutant Col10a1 mRNA containing nonsense mutations. We found that deleting any of the three conserved sequence regions within the 3' UTR (region I, 23 bp; region II, 170 bp; and region III, 76 bp) prevented mutant mRNA decay, but a smaller 13 bp deletion within region III was permissive for decay. These data suggest that the 3' UTR participates in collagen X last-exon mRNA decay and that overall 3' UTR configuration, rather than specific linear-sequence motifs, may be important in specifying decay of Col10a1 mRNA containing nonsense mutations.
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16
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Simões B, Conceição N, Viegas CSB, Pinto JP, Gavaia PJ, Hurst LD, Kelsh RN, Cancela ML. Identification of a promoter element within the zebrafish colXalpha1 gene responsive to runx2 isoforms Osf2/Cbfa1 and til-1 but not to pebp2alphaA2. Calcif Tissue Int 2006; 79:230-44. [PMID: 17033725 DOI: 10.1007/s00223-006-0111-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2006] [Accepted: 06/21/2006] [Indexed: 10/24/2022]
Abstract
Type X collagen is a short chain collagen specifically expressed by hypertrophic chondrocytes during endochondral ossification. We report here the functional analysis of the zebrafish (Danio rerio) collagen Xalpha1 gene (colXalpha1) promoter with the identification of a region responsive to two isoforms of the runt domain transcription factor runx2. Furthermore, we provide evidence for the presence of dual promoter usage in zebrafish, a finding that should be important to further understanding of the regulation of its restricted tissue distribution and spatial-temporal expression during early development. The zebrafish colXalpha1 gene structure is comparable to that recently identified by comparative genomics in takifugu and shows homology with corresponding mammalian genes, indicating that its general architecture has been maintained throughout vertebrate evolution. Our data suggest that, as in mammals, runx2 plays a role in the development of the osteogenic lineage, supporting zebrafish as a model for studies of bone and cartilage development.
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Affiliation(s)
- B Simões
- Centro de Ciências do Mar do Algarve, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
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Kotajima S, Kishimoto KN, Watanuki M, Hatori M, Kokubun S. Gene expression analysis of ectopic bone formation induced by electroporatic gene transfer of BMP4. Ups J Med Sci 2006; 111:231-41. [PMID: 16961179 DOI: 10.3109/2000-1967-044] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Implantation of bone morphogenetic protein (BMP) using a carrier or by BMP gene transfer into rodent muscle can induce bone formation. Implanted BMP becomes bioactive immediately after implantation. In BMP gene transfer, there is a time-lag between the secretion of gene products and bone formation. We analyzed the gene expression of chondrogenic and osteogenic specific markers in the process of ectopic bone formation by using semi-quantitative RT-PCR. A plasmid vector containing mouse BMP4 gene (pCAGGS-BMP4) was transferred into the gastrocnemius muscles of mice using electroporation. Histological examination revealed the process of endochondral bone formation in the pCAGGS-BMP4 transferred muscles. As chondrogenic markers, aggrecan gene maximal expression was detected on day 7 and decreased by day 14, and for collagen X the gene maximal expression was on day 10. As osteogenic markers, osteocalcin (OCN), bone sialoprotein (BSP) and osteopontin (OPN) gene expressions were clearly detected from day 10 and then increased by day 14. In conclusion, the present study proved that ectopic bone formation by BMP4 gene transfer into the muscle induced endochondral ossification that corresponded well with that to that by implantation of demineralized bone matrix.
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Affiliation(s)
- Satoshi Kotajima
- Department of Orthopaedic Surgery, Tohoku University School of Medicine, Sendai, Miyagi, Japan
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18
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Shen G, Rabie AB, Zhao ZH, Kaluarachchi K. Forward deviation of the mandibular condyle enhances endochondral ossification of condylar cartilage indicated by increased expression of type X collagen. Arch Oral Biol 2005; 51:315-24. [PMID: 16199001 DOI: 10.1016/j.archoralbio.2005.08.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Revised: 08/12/2005] [Accepted: 08/26/2005] [Indexed: 11/20/2022]
Abstract
OBJECTIVE Using type X collagen as a marker, this research was designed to examine the alteration of condylar growth in response to mandibular condylar forward positioning. METHODS One hundred female Sprague-Dawley rats with 5 weeks of age were randomly divided into five experimental and five control groups. In the experimental groups, bite jumping appliances created forward positioning of the condyle. The experimental rats, together with the age-matched controls, were sacrificed on days 3, 7, 14, 21 and 30, respectively. Tissue sections were cut in the sagittal plane through the mandibular condyle and were processed for in situ hybridization and immunostaining of type X collagen and then for quantitative imaging analyses. RESULTS (1) Both type X collagen mRNA in situ hybridization signals and type X collagen immunostaining were localized within the hypertrophic zone of the condylar cartilage. (2) With condylar forward positioning, the level of type X collagen mRNA signals (8,541 +/- 74 microm(2) at peak) was 300% higher than that in the controls (2,117 +/- 78 microm(2) at peak); type X collagen immunostaining in condylar advancing groups (54,864 +/- 134 microm(2) at peak) was 254% more than that in the controls (15,470 +/- 121 microm(2) at peak). (3) The amount of type X collagen mRNA signals and immunostaining in experimental and control groups reached the highest levels at day 14 and day 21, respectively, indicating that an increase in endochondral ossification occurred 21 days after condylar forward deviation. CONCLUSION Condylar forward repositioning provokes an enhanced maturation of condylar chondrocytes resulting in increased synthesis of type X collagen, a extracellular protein that attributes to endochondral ossification.
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Affiliation(s)
- Gang Shen
- Department of Orthodontics, School of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University, Shanghai, China.
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19
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Shen G, Hägg U, Rabie AB, Kaluarachchi K. Identification of temporal pattern of mandibular condylar growth: a molecular and biochemical experiment. Orthod Craniofac Res 2005; 8:114-22. [PMID: 15888124 DOI: 10.1111/j.1601-6343.2005.00316.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Based on the phenomenon that expression of type X collagen and capillary endothelium correlates with endochondral ossification, the prime aim of this study was to establish the temporal pattern of condylar growth in Sprague-Dawley rats by biochemically identifying the expression of these two factors. DESIGN Sprague-Dawley rats were divided into five groups representing five different stages during somatic pubertal growth. In situ hybridization and immunoperoxidase were performed to examine expression of type X collagen in hypertrophic zone and capillary endothelium in erosive zone of condylar cartilage. Computer-assisted imaging analyses were conducted to allow for a quantitative assessment of the expression of these two factors, from which the temporal pattern of condylar growth was inferred. RESULTS (1) Synthesis of type X collagen and emergence of capillary endothelium were critical factors during the transition of condylar cartilage from chondrogenesis into osteogenesis, a biological pathway that leads to endochondral bone formation, the mode through which the condyle grows. (2) Quantitative analyses revealed the temporal pattern of the expression of these two factors, indicating that the thrust of natural growth of the condyle in the rats occurred in concomitance with somatic pubertal growth, featured by an acceleration starting from day 38, a maximum growth rate on day 56, followed by a decrease afterwards. CONCLUSION It is suggested that the biochemical examination of growth markers, such as type X collagen, might be a new approach to accurately depict temporal pattern of condylar growth which is too delicate to be reflected by gross measurement not only in Sprague-Dawley rats but potentially also in other species.
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Affiliation(s)
- G Shen
- Department of Orthodontics, School of Stomatology, Shanghai Second Medical University, Shanghai, China.
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20
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Brachvogel B, Moch H, Pausch F, Schlötzer-Schrehardt U, Hofmann C, Hallmann R, von der Mark K, Winkler T, Pöschl E. Perivascular cells expressing annexin A5 define a novel mesenchymal stem cell-like population with the capacity to differentiate into multiple mesenchymal lineages. Development 2005; 132:2657-68. [PMID: 15857912 DOI: 10.1242/dev.01846] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The annexin A5 gene (Anxa5) was recently found to be expressed in the developing and adult vascular system as well as the skeletal system. In this paper, the expression of an Anxa5-lacZ fusion gene was used to define the onset of expression in the vasculature and to characterize these Anxa5-lacZ-expressing vasculature-associated cells. After blastocyst implantation, Anxa5-lacZ-positive cells were first detected in extra-embryonic tissues and in angioblast progenitors forming the primary vascular plexus. Later, expression is highly restricted to perivascular cells in most blood vessels resembling pericytes or vascular smooth muscle cells. Viable Anxa5-lacZ+ perivascular cells were isolated from embryos as well as adult brain meninges by specific staining with fluorescent X-gal substrates and cell-sorting. These purified lacZ+ cells specifically express known markers of pericytes, but also markers characteristic for stem cell populations. In vitro and in vivo differentiation experiments show that this cell pool expresses early markers of chondrogenesis, is capable of forming a calcified matrix and differentiates into adipocytes. Hence, Anxa5 expression in perivascular cells from mouse defines a novel population of cells with a distinct developmental potential.
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Affiliation(s)
- Bent Brachvogel
- Department of Cell and Matrix Biology, MCRI, 3052 Parkville Victoria, Australia.
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21
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Wong QNY, Ng VCW, Lin MCM, Kung HF, Chan D, Huang JD. Efficient and seamless DNA recombineering using a thymidylate synthase A selection system in Escherichia coli. Nucleic Acids Res 2005; 33:e59. [PMID: 15800210 PMCID: PMC1072810 DOI: 10.1093/nar/gni059] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
λ-Red system-based recombinogenic engineering is a powerful new method to engineer DNA without the need for restriction enzymes or ligases. Here, we report the use of a single selectable marker to enhance the usefulness of this approach. The strategy is to utilize the thymidylate synthase A (thyA) gene, which encodes an enzyme involved in the synthesis of thymidine 5′-triphosphate, for both positive and negative selection. With this approach, we successfully created point mutations in plasmid and bacterial artificial chromosome (BAC) DNA containing the mouse Col10a1 gene. The results showed that the thyA selection system is highly efficient and accurate, giving an average of >90% selection efficiency. This selection system produces DNA that is free from permanent integration of unwanted sequences, thus allowing unlimited rounds of modifications if required.
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Affiliation(s)
- Queenie N. Y. Wong
- Institute of Molecular Biology, The University of Hong KongPokfulam, Hong Kong SAR, China
| | | | - Marie C. M. Lin
- Institute of Molecular Biology, The University of Hong KongPokfulam, Hong Kong SAR, China
| | - Hsiang-fu Kung
- Institute of Molecular Biology, The University of Hong KongPokfulam, Hong Kong SAR, China
| | - Danny Chan
- To whom correspondence should be addressed. Tel: +852 2819 9482; Fax: +852 2855 1254;
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Padhi BK, Joly L, Tellis P, Smith A, Nanjappa P, Chevrette M, Ekker M, Akimenko MA. Screen for genes differentially expressed during regeneration of the zebrafish caudal fin. Dev Dyn 2005; 231:527-41. [PMID: 15376328 DOI: 10.1002/dvdy.20153] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The zebrafish caudal fin constitutes an important model for studying the molecular basis of tissue regeneration. The cascade of genes induced after amputation or injury, leading to restoration of the lost fin structures, include those responsible for wound healing, blastema formation, tissue outgrowth, and patterning. We carried out a systematic study to identify genes that are up-regulated during "initiation" (1 day) and "outgrowth and differentiation" (4 days) of fin regeneration by using two complementary methods, suppression subtraction hybridization (SSH) and differential display reverse transcriptase polymerase chain reaction (DDRT-PCR). We obtained 298 distinct genes/sequences from SSH libraries and 24 distinct genes/sequences by DDRT-PCR. We determined the expression of 54 of these genes using in situ hybridization. In parallel, gene expression analyses were done in zebrafish embryos and early larvae. The information gathered from the present study provides resources for further investigations into the molecular mechanisms of fin development and regeneration.
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Affiliation(s)
- Bhaja K Padhi
- Ottawa Health Research Institute, 725 Parkdale Avenue, Ottawa K1Y 4E9, Ontario, Canada
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23
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Shen G. The role of type X collagen in facilitating and regulating endochondral ossification of articular cartilage. Orthod Craniofac Res 2005; 8:11-7. [PMID: 15667640 DOI: 10.1111/j.1601-6343.2004.00308.x] [Citation(s) in RCA: 164] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
UNLABELLED AUTHOR: Shen G Objective -This review was compiled to explore the role of type X collagen in growth, development and remodeling of articular cartilage by elucidating the linkage between the synthesis of this protein and the phenotypic changes in chondrogenesis and the onset of endochondral ossification. DESIGN The current studies closely dedicated to elucidating the role of type X collagen incorporating into chondrogenesis and endochondral ossification of articular cartilage were assessed and analyzed to allow for obtaining the mainstream consensus on the bio-molecular mechanism with which type X collagen functions in articular cartilage. RESULTS There are spatial and temporal correlations between synthesis of type X collagen and occurrence of endochondral ossification. The expression of type X collagen is confined within hypertrophic condrocytes and precedes the embark of endochondral bone formation. Type X collagen facilitates endochondral ossification by regulating matrix mineralization and compartmentalizing matrix components. CONCLUSION Type X collagen is a reliable marker for new bone formation in articular cartilage. The future clinical application of this collagen in inducing or mediating endochondral ossification is perceived, e.g. the fracture healing of synovial joints and adaptive remodeling of madibular condyle.
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Affiliation(s)
- G Shen
- Discipline of Orthodontics, Faculty of Dentistry, The University of Sydney, Chalmers Street, Surry Hill, NSW 2010, Australia.
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Conceição N, Silva AC, Fidalgo J, Belo JA, Cancela ML. Identification of alternative promoter usage for the matrix Gla protein gene. Evidence for differential expression during early development in Xenopus laevis. FEBS J 2005; 272:1501-10. [PMID: 15752365 DOI: 10.1111/j.1742-4658.2005.04590.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent cloning of the Xenopus laevis (Xl) matrix Gla protein (MGP) gene indicated the presence of a conserved overall structure for this gene between mammals and amphibians but identified an additional 5'-exon, not detected in mammals, flanked by a functional, calcium-sensitive promoter, 3042 bp distant from the ATG initiation codon. DNA sequence analysis identified a second TATA-like DNA motif located at the 3' end of intron 1 and adjacent to the ATG-containing second exon. This putative proximal promoter was found to direct transcription of the luciferase reporter gene in the X. laevis A6 cell line, a result confirmed by subsequent deletion mutant analysis. RT-PCR analysis of XlMGP gene expression during early development identified a different temporal expression of the two transcripts, strongly suggesting differential promoter activation under the control of either maternally inherited or developmentally induced regulatory factors. Our results provide further evidence of the usefulness of nonmammalian model systems to elucidate the complex regulation of MGP gene transcription and raise the possibility that a similar mechanism of regulation may also exist in mammals.
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Campbell MR, Gress CJ, Appleman EH, Jacenko O. Chicken collagen X regulatory sequences restrict transgene expression to hypertrophic cartilage in mice. THE AMERICAN JOURNAL OF PATHOLOGY 2004; 164:487-99. [PMID: 14742255 PMCID: PMC1602267 DOI: 10.1016/s0002-9440(10)63139-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/17/2003] [Indexed: 11/27/2022]
Abstract
Collagen X is produced by hypertrophic cartilage undergoing endochondral ossification. Transgenic mice expressing defective collagen X under the control of 4.7- or 1.6-kb chicken collagen X regulatory sequences yielded skeleto-hematopoietic defects (Jacenko O, LuValle P, Olsen BR: Spondylometaphyseal dysplasia in mice carrying a dominant-negative mutation in a matrix protein specific for cartilage-to-bone transition. Nature 1993, 365:56-61; Jacenko O, Chan D, Franklin A, Ito S, Underhill CB, Bateman JF, Campbell MR: A dominant interference collagen X mutation disrupts hypertrophic chondrocyte pericellular matrix and glycosaminoglycan and proteoglycan distribution in transgenic mice. Am J Pathol 2001, 159:2257-2269; Jacenko O, Roberts DW, Campbell MR, McManus PM, Gress CJ, Tao Z: Linking hematopoiesis to endochondral ossification through analysis of mice transgenic for collagen X. Am J Pathol 2002, 160:2019-2034). Current data indicate that the hematopoietic abnormalities do not result from extraskeletal expression of endogenous collagen X or the transgene. Organs from mice carrying either promoter were screened by immunohistochemistry, in situ hybridization, and Northern blot; transgene and mouse collagen X proteins and messages were detected only in hypertrophic cartilage. Likewise, reverse transcriptase-polymerase chain reaction revealed both transgene and mouse collagen X amplicons only in the endochondral skeleton of mice with the 4.7-kb promoter; however, in mice with the 1.6-kb promoter, multiple organs were transgene-positive. Collagen X and transgene amplicons were also detected in marrow, but likely resulted from contaminating trabecular bone; this was supported by reverse transcriptase-polymerase chain reaction analysis of rat tibial zones free of trabeculae. Our data demonstrate that in mice, the 4.7-kb chicken collagen X promoter restricts transcription temporo-spatially to that of endogenous collagen X, and imply that murine skeleto-hematopoietic defects result from transgene co-expression with collagen X. Moreover, the 4.7-kb hypertrophic cartilage-specific promoter could be used for targeting transgenes to this tissue site in mice.
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Affiliation(s)
- Michelle R Campbell
- Department of Animal Biology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania 19104-6046, USA
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Holmbeck K, Bianco P, Chrysovergis K, Yamada S, Birkedal-Hansen H. MT1-MMP-dependent, apoptotic remodeling of unmineralized cartilage: a critical process in skeletal growth. ACTA ACUST UNITED AC 2004; 163:661-71. [PMID: 14610065 PMCID: PMC2173657 DOI: 10.1083/jcb.200307061] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Skeletal tissues develop either by intramembranous ossification, where bone is formed within a soft connective tissue, or by endochondral ossification. The latter proceeds via cartilage anlagen, which through hypertrophy, mineralization, and partial resorption ultimately provides scaffolding for bone formation. Here, we describe a novel and essential mechanism governing remodeling of unmineralized cartilage anlagen into membranous bone, as well as tendons and ligaments. Membrane-type 1 matrix metalloproteinase (MT1-MMP)–dependent dissolution of unmineralized cartilages, coupled with apoptosis of nonhypertrophic chondrocytes, mediates remodeling of these cartilages into other tissues. The MT1-MMP deficiency disrupts this process and uncouples apoptotic demise of chondrocytes and cartilage degradation, resulting in the persistence of “ghost” cartilages with adverse effects on skeletal integrity. Some cells entrapped in these ghost cartilages escape apoptosis, maintain DNA synthesis, and assume phenotypes normally found in the tissues replacing unmineralized cartilages. The coordinated apoptosis and matrix metalloproteinase-directed cartilage dissolution is akin to metamorphosis and may thus represent its evolutionary legacy in mammals.
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Affiliation(s)
- Kenn Holmbeck
- Matrix Metalloproteinase Unit, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA
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Wai AWK, Gillemans N, Raguz-Bolognesi S, Pruzina S, Zafarana G, Meijer D, Philipsen S, Grosveld F. HS5 of the human beta-globin locus control region: a developmental stage-specific border in erythroid cells. EMBO J 2003; 22:4489-500. [PMID: 12941700 PMCID: PMC202379 DOI: 10.1093/emboj/cdg437] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Elements with insulator/border activity have been characterized most extensively in Drosophila melanogaster. In vertebrates, the first example of such an element was provided by a hypersensitive site of the chicken beta-globin locus, cHS4. It has been proposed that the homologous site in humans, HS5, functions as a border of the human beta-globin locus. Here, we have characterized HS5 of the human beta-globin locus control region. We have examined its tissue-specificity and assessed its insulating properties in transgenic mice using a lacZ reporter assay. Most importantly, we have tested its enhancer blocking activity in the context of the full beta-globin locus. Our results show that HS5 is erythroid-specific rather than ubiquitous in human tissues. Furthermore, HS5 does not fulfil the criteria of a general in vivo insulator in the transgene protection assay. Finally, a HS5 conditional deletion from the complete locus demonstrates that HS5 has no discernable activity in adult erythroid cells. Surprisingly, HS5 functions as an enhancer blocker in embryonic erythroid cells. We conclude that HS5 is a developmental stage-specific border in erythroid cells.
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Affiliation(s)
- Albert W K Wai
- Department of Cell Biology, Erasmus MC, PO Box 1738, 3000 DR Rotterdam, The Netherlands
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O'Shea PJ, Harvey CB, Suzuki H, Kaneshige M, Kaneshige K, Cheng SY, Williams GR. A thyrotoxic skeletal phenotype of advanced bone formation in mice with resistance to thyroid hormone. Mol Endocrinol 2003; 17:1410-24. [PMID: 12677005 DOI: 10.1210/me.2002-0296] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Thyroid hormone (T3) regulates bone turnover and mineralization in adults and is essential for skeletal development during childhood. Hyperthyroidism is an established risk factor for osteoporosis. Nevertheless, T3 actions in bone remain poorly understood. Patients with resistance to thyroid hormone, due to mutations of the T3-receptor beta (TRbeta) gene, display variable phenotypic abnormalities, particularly in the skeleton. To investigate the actions of T3 during bone development, we characterized the skeleton in TRbetaPV mutant mice. TRbetaPV mice harbor a targeted resistance to thyroid hormone mutation in TRbeta and recapitulate the human condition. A severe phenotype, which includes shortened body length, was evident in homozygous TRbetaPV/PV animals. Accelerated growth in utero was associated with advanced endochondral and intramembranous ossification. Advanced bone formation resulted in postnatal growth retardation, premature quiescence of the growth plates, and shortened bone length, together with increased bone mineralization and craniosynostosis. In situ hybridization demonstrated increased expression of fibroblast growth factor receptor-1, a T3-regulated gene in bone, in TRbetaPV/PV perichondrium, growth plate chondrocytes, and osteoblasts. Thus, the skeleton in TRbetaPV/PV mice is thyrotoxic and displays phenotypic features typical of juvenile hyperthyroidism.
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MESH Headings
- Animals
- Animals, Newborn
- Body Height/genetics
- Bone Density
- Bone Development/genetics
- Bone and Bones/abnormalities
- Craniosynostoses/genetics
- Craniosynostoses/pathology
- Female
- Gene Expression Regulation, Developmental
- Growth Plate
- Hyperthyroidism/genetics
- Limb Deformities, Congenital/genetics
- Limb Deformities, Congenital/pathology
- Male
- Mice
- Mice, Mutant Strains
- Receptor Protein-Tyrosine Kinases/genetics
- Receptor, Fibroblast Growth Factor, Type 1
- Receptors, Fibroblast Growth Factor/genetics
- Receptors, Thyroid Hormone/genetics
- Receptors, Thyroid Hormone/metabolism
- Thyroid Hormone Receptors beta
- Thyroid Hormone Resistance Syndrome/genetics
- Thyroid Hormone Resistance Syndrome/physiopathology
- Thyroxine/blood
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Affiliation(s)
- Patrick J O'Shea
- Molecular Endocrinology Group, Division of Medicine and Medical Research Council Clinical Sciences Centre, Faculty of Medicine, Imperial College London, Hammersmith Hospital, United Kingdom
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Ganss B, Kobayashi H. The zinc finger transcription factor Zfp60 is a negative regulator of cartilage differentiation. J Bone Miner Res 2002; 17:2151-60. [PMID: 12469909 DOI: 10.1359/jbmr.2002.17.12.2151] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The differentiation of many mesenchyme-derived cells, including cells that form bone and cartilage, is regulated at the level of gene transcription, but many of the factors involved in this regulation remain to be identified. In this study, a modified RNA fingerprinting technique was used to identify the KRAB domain zinc finger transcription factor Zfp60 as a candidate regulator of cell differentiation in mouse calvaria primary cultures. The highest expression of Zfp60 mRNA in vivo was found between embryonic day 11 (E11) and E15 during mouse embryonic development, coinciding with stages of active organ formation. The expression of Zfp60 mRNA and protein was analyzed further in mouse embryos during skeletal development. The most prominent expression was found in prehypertrophic chondrocytes, where it coincides with the expression of key regulators of chondrocyte maturation, Indian hedgehog (Ihh), and the parathyroid hormone-related peptide (PTHrP) receptor. Zfp60 mRNA was also found transiently expressed during chondrogenesis of C1 cells in vitro, preceding collagen type X expression and cellular hypertrophy. Overexpression of Zfp60 inhibited cartilage differentiation in the chondrogenic ATDC5 cell line. These results suggest a role for Zfp60 as a negative regulator of gene transcription, specifically during the development and/or differentiation of chondrocytes.
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Affiliation(s)
- Bernhard Ganss
- CIHR Group in Matrix Dynamics, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
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Nakase T, Ariga K, Meng W, Iwasaki M, Tomita T, Myoui A, Yonenobu K, Yoshikawa H. Distribution of genes for parathyroid hormone (PTH)-related peptide, Indian hedgehog, PTH receptor and patched in the process of experimental spondylosis in mice. J Neurosurg 2002; 97:82-7. [PMID: 12120657 DOI: 10.3171/spi.2002.97.1.0082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Little is known about the molecular mechanisms underlying the process of spondylosis. The authors determined the extent of genetic localization of major regulators of chondrogenesis such as Indian hedgehog (Ihh) and parathyroid hormone (PTH)-related peptide (PTHrP) and their receptors during the development of spondylosis in their previously established experimental mouse model. METHODS Experimental spondylosis was induced in 5-week-old ICR mice. The cervical spines were chronologically harvested, and histological sections were prepared. Messenger (m) RNA for PTHrP, Ihh, PTH receptor (PTHR; a receptor for PTHrP), patched (Ptc; a receptor for Ihh), bone morphogenetic protein (BMP)-6, and collagen type X (COL10; a marker for mature chondrocyte) was localized in the tissue sections by performing in situ hybridization. In the early stage, mRNA for COL10, Ihh, and BMP-6 was absent; however, mRNA for PTHrP, PTHR, and Ptc was detected in the anterior margin of the cervical discs. In the late stage, evidence of COL10 mRNA began to be detected, and transcripts for Ihh, PTHrP, and BMP-6 were localized in hypertrophic chondrocytes adjacent to the bone-forming area in osteophyte. Messenger RNA for Ptc and PTHR continued to localize at this stage. In control mice, expression of these genes was absent. CONCLUSIONS The localization of PTHrP, Ihh, BMP-6, and the receptors PTHR and Ptc demonstrated in the present experimental model indicates the possible involvement of molecular signaling by PTHrP (through the PTHR), Ihh (through the Ptc), and BMP-6 in the regulation of chondrocyte maturation leading to endochondral ossification in spondylosis.
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Affiliation(s)
- Takanobu Nakase
- Department of Orthopaedic Surgery, Osaka University Medical School, Suita, Japan.
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31
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Tsumaki N, Nakase T, Miyaji T, Kakiuchi M, Kimura T, Ochi T, Yoshikawa H. Bone morphogenetic protein signals are required for cartilage formation and differently regulate joint development during skeletogenesis. J Bone Miner Res 2002; 17:898-906. [PMID: 12009021 DOI: 10.1359/jbmr.2002.17.5.898] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The bone morphogenetic protein (BMP) family consists of a large number of members and has diverse biological activities during development. Various tissues express pleural BMP family members, which seem to cooperatively regulate developmental events. Here, multiple BMP signals were inactivated in chondrocytes to clarify the function of BMPs during skeletogenesis. To obtain tissue-specific inactivation, Noggin gene (Nog) was overexpressed in cartilage under the control of a2(XI) collagen gene (Collla2) promoter/enhancer sequences. The resultant transgenic mice lacked most of their cartilaginous components, suggesting that cartilage does not develop without BMP signals. These effects seem to be mediated through down-regulation of Sox9 expression. Conversely, specific BMP signals were activated in the skeleton by targeted expression of Bmp4 in cartilage and the resultant phenotype was compared with that of transgenic mice expressing growth and differentiation factor-5 (GDF-5), another BMP family member. Overactivity of Bmp4 in the skeleton caused an increase of cartilage production and enhanced chondrocyte differentiation, as GDF5 expression did, but it did not disturb joint formation as GDF5 did. During skeletogenesis, unique roles of each BMP may reside in the regulation of joint development. Together with the common effect on the cartilage overproduction by Bmp4 and GDF5 overactivation, loss of cartilage by inactivation of multiple BMPs in Noggin transgenic mice indicates that signals for cartilage production are reinforced by multiple BMPs exclusively. These conclusions may account for the reason why multiple BMPs are coexpressed in cartilage.
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Chambers MG, Kuffner T, Cowan SK, Cheah KSE, Mason RM. Expression of collagen and aggrecan genes in normal and osteoarthritic murine knee joints. Osteoarthritis Cartilage 2002; 10:51-61. [PMID: 11795983 DOI: 10.1053/joca.2001.0481] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The STR/ort mouse strain develops osteoarthritis (OA) of the medial tibial cartilage whilst CBA mice do not develop this disease. We investigated whether changes occur in the expression of genes encoding major extracellular matrix proteins in the connective tissue of the murine knee joint in OA. DESIGN Expression of the genes encoding collagens II (Col2alpha1), X (Col10alpha1), alpha2(XI) (Col11alpha2) and aggrecan (Agc) was detected in skeletally mature and immature male mice of the CBA and STR/ort strains by in situ hybridization. RESULTS Col2alpha1 was expressed by chondrocytes of the tibial and patella-femoral cartilage and by the meniscal cartilage in all young mice (4-9 weeks) but only in the patella-femoral cartilage in older mice of both strains (36-45 weeks). In contrast Col2alpha1 was expressed by growth plate chondrocytes of both species at all ages. Similarly, Col2alpha1 transcripts were detected in cruciate ligament cells in both strains at all ages. Col10alpha1 transcripts were detected in cruciate ligament cells in both strains at all ages. Col10alpha1 expression was evident in the hypertrophic chondrocytes in the growth plate of young CBA and STR mice, but was not active in these cells in mature animals. However, Col10alpha1 was transcribed in articular chondrocytes of the tibia, meniscal and patella-femoral cartilages of all ages, in normal and osteoarthritic mice. Transcripts were also present in ligament of some mature animals. Col11alpha2 followed a similar pattern of expression in CBA cartilages to Col2alpha1, being active in adult growth plate but generally inactive in adult articular cartilages. Young CBA and STR/ort mice expressed Col11alpha2 in articular cartilage and very strongly throughout the growth plate. Agc expression was detected in all articular cartilages at all ages in both strains. Interestingly, transcripts for all four genes were absent in tibial articular chondrocytes located close to osteoarthritic lesions in STR/ort mice, indicating that these cells are unable to synthesize matrix proteins. Adult STR/ort mice also showed evidence of tissue remodeling around the periphery of the knee joint. Cells in remodeling areas actively transcribed Col2alpha1, Col10alpha1, Col11alpha2 and Agc. CONCLUSION It is unlikely that OA develops in STR/ort mice because of failure to express major proteins in joint tissue. However, once lesions develop in articular cartilage neighbouring chondrocytes fail to express genes encoding several matrix proteins.
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Affiliation(s)
- M G Chambers
- Cell & Molecular Biology Section, Division of Biomedical Sciences, Imperial College School of Medicine, London, England
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A dominant interference collagen X mutation disrupts hypertrophic chondrocyte pericellular matrix and glycosaminoglycan and proteoglycan distribution in transgenic mice. THE AMERICAN JOURNAL OF PATHOLOGY 2001; 159:2257-69. [PMID: 11733375 PMCID: PMC1850580 DOI: 10.1016/s0002-9440(10)63076-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Collagen X transgenic (Tg) mice displayed skeleto-hematopoietic defects in tissues derived by endochondral skeletogenesis.(1) Here we demonstrate that co-expression of the transgene product containing truncated chicken collagen X with full-length mouse collagen X in a cell-free translation system yielded chicken-mouse hybrid trimers and truncated chicken homotrimers; this indicated that the mutant could assemble with endogenous collagen X and thus had potential for dominant interference. Moreover, species-specific collagen X antibodies co-localized the transgene product with endogenous collagen X to hypertrophic cartilage in growth plates and ossification centers; proliferative chondrocytes also stained diffusely. Electron microscopy revealed a disrupted hexagonal lattice network in the hypertrophic chondrocyte pericellular matrix in Tg growth plates, as well as altered mineral deposition. Ruthenium hexamine trichloride-positive aggregates, likely glycosaminoglycans (GAGs)/proteoglycans (PGs), were also dispersed throughout the chondro-osseous junction. These defects likely resulted from transgene co-localization and dominant interference with endogenous collagen X. Moreover, altered GAG/PG distribution in growth plates of both collagen X Tg and null mice was confirmed by a paucity of staining for hyaluronan and heparan sulfate PG. A provocative hypothesis links the disruption of the collagen X pericellular network and GAG/PG decompartmentalization to the potential locus for hematopoietic failure in the collagen X mice.
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Stevens DA, Hasserjian RP, Robson H, Siebler T, Shalet SM, Williams GR. Thyroid hormones regulate hypertrophic chondrocyte differentiation and expression of parathyroid hormone-related peptide and its receptor during endochondral bone formation. J Bone Miner Res 2000; 15:2431-42. [PMID: 11127207 DOI: 10.1359/jbmr.2000.15.12.2431] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Hypothyroidism in children causes developmental abnormalities in bone and growth arrest, while thyrotoxicosis accelerates growth rate and advances bone age. To determine the effects of thyroid hormones on endochondral bone formation, we examined epiphyseal growth plates in control, hypothyroid, thyrotoxic, and hypothyroid-thyroxine (hypo-T4)-treated rats. Hypothyroid growth plates were grossly disorganized, contained an abnormal matrix rich in heparan sulfate, and hypertrophic chondrocyte differentiation failed to progress. These effects correlated with the absence of collagen X expression and increased parathyroid hormone-related protein (PTHrP) messenger RNA (mRNA) expression. In thyrotoxic growth plates, histology essentially was normal but PTHrP receptor (PTHrP-R) mRNA was undetectable. PTHrP is a potent inhibitor of hypertrophic chondrocyte differentiation that acts in a negative feedback loop with the secreted factor Indian hedgehog (Ihh) to regulate endochondral bone formation. Thyroid hormone receptor alpha1(TRalpha1), TRalpha2, and TRbeta1 proteins were localized to reserve zone progenitor cells and proliferating chondrocytes in euthyroid rat cartilage; regions in which PTHrP and PTHrP-R expression were affected by thyroid status. Thus, dysregulated Ihh/PTHrP feedback loop activity may be a key mechanism that underlies growth disorders in childhood thyroid disease.
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Affiliation(s)
- D A Stevens
- Division of Medicine and Medical Research Council Clinical Sciences Center, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
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35
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Ikegawa S, Nakamura K, Nagano A, Haga N, Nakamura Y. Mutations in the N-terminal globular domain of the type X collagen gene (COL10A1) in patients with Schmid metaphyseal chondrodysplasia. Hum Mutat 2000; 9:131-5. [PMID: 9067753 DOI: 10.1002/(sici)1098-1004(1997)9:2<131::aid-humu5>3.0.co;2-c] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Schmid metaphyseal chondrodysplasia (SMCD) is a relatively common, heritable osteochondrodysplasia characterized by short-limbed short stature with normal facies, and generalized metaphyseal dysplasias of the long and short tubular bones. Several mutations of the type X collagen gene (COL10A1) have been reported in patients with SMCD, all in the C-terminal globular domain. To address whether mutations in other domains can cause SMCD, we examined the coding region of the COL10A1 gene in DNA samples from six Japanese families affected with SMCD, by direct sequencing. We detected novel mutations in three unrelated SMCD patients; one was a one-base deletion in the C-terminal globular domain and others were de novo missense mutations in the N-terminal globular domain. All three cases revealed a typical clinical phenotype for SMCD. Thus, we have demonstrated that mutations of COL10A1 in regions other than the C-terminal globular domain can cause SMCD, and the results suggest that the N-terminal globular domain also plays an important role in formation of type X collagen.
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Affiliation(s)
- S Ikegawa
- Laboratory of Molecular Medicine, University of Tokyo, Japan
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Wai AW, Ng LJ, Watanabe H, Yamada Y, Tam PP, Cheah KS. Disrupted expression of matrix genes in the growth plate of the mouse cartilage matrix deficiency (cmd) mutant. DEVELOPMENTAL GENETICS 2000; 22:349-58. [PMID: 9664687 DOI: 10.1002/(sici)1520-6408(1998)22:4<349::aid-dvg5>3.0.co;2-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chondrodysplasia in the autosomal recessive cartilage matrix deficiency (cmd) mutant is caused by lack of the proteoglycan aggrecan arising from a mutation in the gene. Homozygous cmd/cmd mice are characterized by disorganisation of chondrocytes in the growth plate, disproportionate dwarfism, cleft palate, and perinatal lethality. We have studied the impact of the aggrecan deficiency on the expression of other matrix genes during the differentiation of chondrocytes in the growth plate of cmd/cmd 18.5 day fetuses. Compared with the wild-type, there are significant differences in the growth plates of cmd mutants in the combinations of co-expression of genes encoding the glycoprotein link protein, proteoglycan syndecan 3, collagens alpha 1 (X) [Col10a1], alpha 2(XI) [Col11a2], and the alternative transcripts of alpha 1 (II) [Col2a1 type IIA form], and alpha 1 (IX) [Col9a1 long and short forms]. The discordance of gene expression in cmd chondrocytes may be additional factors contributing to the disrupted cellular architecture of the growth plate resulting from the primary absence of aggrecan.
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Affiliation(s)
- A W Wai
- Department of Biochemistry, University of Hong Kong, China
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37
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Affiliation(s)
- R Garrone
- CNRS Institute of Biology and Chemistry of Proteins, Claude Bernard University, Lyons, France
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38
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Watanabe H, Yamada Y. Mice lacking link protein develop dwarfism and craniofacial abnormalities. Nat Genet 1999; 21:225-9. [PMID: 9988279 DOI: 10.1038/6016] [Citation(s) in RCA: 155] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Link protein (LP), an extracellular matrix protein in cartilage, stabilizes aggregates of aggrecan and hyaluronan, giving cartilage its tensile strength and elasticity. Cartilage provides the template for endochondral ossification and is crucial for determining the length and width of the skeleton. During endochondral bone formation, hypertrophic chondrocytes die and the cartilage is replaced with bone matrix. Here, we have generated targeted mutations in mice in the gene encoding LP (Crtl1). Homozygotes showed defects in cartilage development and delayed bone formation with short limbs and craniofacial anomalies. Most Crtl1(tm1Nid/tm1Nid) mice died shortly after birth due to respiratory failure, but some survived and developed progressive dwarfism and lordosis of the cervical spine. They showed small epiphysis, slightly flared metaphysis of long bones and flattened vertebrae, characteristic of spondyloepiphyseal dysplasias. The cartilage contained significantly reduced aggrecan depositions in the hypertrophic zone, and decreased numbers of prehypertrophic and hypertrophic chondrocytes. Reduced Indian hedgehog (Ihh) expression was observed in prehypertrophic chondrocytes, and apoptosis was inhibited in hypertrophic chondrocytes. These results indicate that LP is important for the formation of proteoglycan aggregates and normal organization of hypertrophic chondrocytes, and suggest that cartilage matrix has a role in chondrocyte differentiation and maturation.
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Affiliation(s)
- H Watanabe
- Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
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Tsumaki N, Tanaka K, Arikawa-Hirasawa E, Nakase T, Kimura T, Thomas JT, Ochi T, Luyten FP, Yamada Y. Role of CDMP-1 in skeletal morphogenesis: promotion of mesenchymal cell recruitment and chondrocyte differentiation. J Cell Biol 1999; 144:161-73. [PMID: 9885252 PMCID: PMC2148125 DOI: 10.1083/jcb.144.1.161] [Citation(s) in RCA: 135] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Cartilage provides the template for endochondral ossification and is crucial for determining the length and width of the skeleton. Transgenic mice with targeted expression of recombinant cartilage-derived morphogenetic protein-1 (CDMP-1), a member of the bone morphogenetic protein family, were created to investigate the role of CDMP-1 in skeletal formation. The mice exhibited chondrodysplasia with expanded cartilage, which consists of the enlarged hypertrophic zone and the reduced proliferating chondrocyte zone. Histologically, CDMP-1 increased the number of chondroprogenitor cells and accelerated chondrocyte differentiation to hypertrophy. Expression of CDMP-1 in the notochord inhibited vertebral body formation by blocking migration of sclerotome cells to the notochord. These results indicate that CDMP-1 antagonizes the ventralization signals from the notochord. Our study suggests a molecular mechanism by which CDMP-1 regulates the formation, growth, and differentiation of the skeletal elements.
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Affiliation(s)
- N Tsumaki
- Craniofacial Developmental Biology and Regeneration Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abstract
Skeletal biology has entered an exciting period with the technological advances in murine transgenesis and human genetics. This review focuses on how these two approaches are being used to address the role of collagen X, the major extracellular matrix component of the focal zone of endochondral ossification, the hypertrophic cartilage zone. The hypothesized role of this unique collagen in skeletal morphogenesis and the phenotypic and biochemical consequences resulting from the disruption of its function are discussed. Specifically, data from three murine models, including transgenic mice with a dominant interference phenotype for collagen X, and two sets of mice with an inactivated collagen X gene through gene targeting and homologous recombination, as well as the human disorder of Schmid metaphyseal chondrodysplasia resulting from mutations in collagen X, are summarized and compared. Several inconsistencies and unresolved issues regarding the murine and human phenotypes and the function of collagen X are discussed.
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Affiliation(s)
- D Chan
- University of Melbourne, Royal Children's Hospital, Department of Pediatrics, Australia
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Beier F, Vornehm S, Pöschl E, von der Mark K, Lammi MJ. Localization of silencer and enhancer elements in the human type X collagen gene. J Cell Biochem 1997; 66:210-8. [PMID: 9213222 DOI: 10.1002/(sici)1097-4644(19970801)66:2<210::aid-jcb8>3.0.co;2-t] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Collagen type X is a short, network-forming collagen expressed temporally and spatially tightly controlled in hypertrophic chondrocytes during endochondral ossification. Studies on chicken chondrocytes indicate that the regulation of type X collagen gene expression is regulated at the transcriptional level. In this study, we have analyzed the regulatory elements of the human type X collagen (Col10a1) by reporter gene constructs and transient transfections in chondrogenic and nonchondrogenic cells. Four different promoter fragments covering up to 2,864 bp of 5'-flanking sequences, either including or lacking the first intron, were linked to luciferase reporter gene and transfected into 3T3 fibroblasts, HT1080 fibrosarcoma cells, prehypertrophic chondrocytes from the resting zone, hypertrophic chondrocytes, and chondrogenic cell lines. The results indicated the presence of three regulatory elements in the human Col10a1 gene besides the proximal promoter. First, a negative regulatory element located between 2.4 and 2.8 kb upstream of the transcription initiation site was active in all nonchondrogenic cells and in prehypertrophic chondrocytes. Second, a positive, but also non-tissue-specific positive regulatory element was present in the first intron. Third, a cell-type-specific enhancer element active only in hypertrophic chondrocytes was located between -2.4 and -0.9 kb confirming a previous report by Thomas et al. [(1995): Gene 160:291-296]. The enhancing effect, however, was observed only when calcium phosphate was either used for transfection or included in the culture medium after lipofection. These findings demonstrate that the rigid control of human Col10a1 gene expression is achieved by both positive and negative regulatory elements in the gene and provide the basis for the identification of factors binding to those elements.
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Affiliation(s)
- F Beier
- Institut für Experimentelle Medizin, Universität Erlangen-Nürnberg, Erlangen, Germany
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42
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Kwan KM, Pang MK, Zhou S, Cowan SK, Kong RY, Pfordte T, Olsen BR, Sillence DO, Tam PP, Cheah KS. Abnormal compartmentalization of cartilage matrix components in mice lacking collagen X: implications for function. J Biophys Biochem Cytol 1997; 136:459-71. [PMID: 9015315 PMCID: PMC2134813 DOI: 10.1083/jcb.136.2.459] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
There are conflicting views on whether collagen X is a purely structural molecule, or regulates bone mineralization during endochondral ossification. Mutations in the human collagen alpha1 (X) gene (COL10A1) in Schmid metaphyseal chondrodysplasia (SMCD) suggest a supportive role. But mouse collagen alpha1 (X) gene (Col10a1) null mutants were previously reported to show no obvious phenotypic change. We have generated collagen X deficient mice, which shows that deficiency does have phenotypic consequences which partly resemble SMCD, such as abnormal trabecular bone architecture. In particular, the mutant mice develop coxa vara, a phenotypic change common in human SMCD. Other consequences of the mutation are reduction in thickness of growth plate resting zone and articular cartilage, altered bone content, and atypical distribution of matrix components within growth plate cartilage. We propose that collagen X plays a role in the normal distribution of matrix vesicles and proteoglycans within the growth plate matrix. Collagen X deficiency impacts on the supporting properties of the growth plate and the mineralization process, resulting in abnormal trabecular bone. This hypothesis would accommodate the previously conflicting views of the function of collagen X and of the molecular pathogenesis of SMCD.
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Affiliation(s)
- K M Kwan
- Biochemistry Department, The University of Hong Kong
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43
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Beier F, Eerola I, Vuorio E, Luvalle P, Reichenberger E, Bertling W, von der Mark K, Lammi MJ. Variability in the upstream promoter and intron sequences of the human, mouse and chick type X collagen genes. Matrix Biol 1996; 15:415-22. [PMID: 9049979 DOI: 10.1016/s0945-053x(96)90160-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The type X collagen gene is specifically expressed in hypertrophic chondrocytes during endochondral ossification. Transcription of the type X collagen gene by these differentiated cells is turned on at the same time as transcription of several other cartilage specific genes is switched off and before mineralization of the matrix begins. Analysis of type X collagen promoters for regulatory regions in different cell culture systems and in transgenic mice has given contradictory results suggesting major differences among species. To approach this problem, we have determined the nucleotide sequences of the two introns and upstream promoter sequences of the human and mouse type X collagen genes and compared them with those of bovine and chick. Within the promoter regions, we found three boxes of homology which are nearly continuous in the human gene but have interruptions in the murine gene. One of these interruptions was identified as a complex 1.9 kb repetitive element with homology to LINE, B1, B2 and long terminal repeat sequences. Regulatory elements of the human type X collagen gene are located upstream of the region where the repetitive element is inserted in the mouse gene, making it likely that the repetitive element is inserted between the coding region and regulatory sequences of the murine gene without interfering with its expression pattern. We also compared the sequences of the introns of both genes and found strong conservation. Comparisons of the mammalian sequences with promoter and first intron sequences of the chicken type X collagen gene revealed that only the proximal 120 nucleotides of the promoter were conserved, whereas all other sequences displayed no obvious homology to the murine and human sequences.
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Affiliation(s)
- F Beier
- Institute for Experimental Medicine, University of Erlangen-Nürnberg, Germany
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44
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Paschalis EP, Jacenko O, Olsen B, Mendelsohn R, Boskey AL. Fourier transform infrared microspectroscopic analysis identifies alterations in mineral properties in bones from mice transgenic for type X collagen. Bone 1996; 19:151-6. [PMID: 8853859 DOI: 10.1016/8756-3282(96)00164-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Type X collagen has been implicated in the morphogenetic events of endochondral ossification (EO), including the calcification of hypertrophic cartilage and trabeculae prior to their replacement by bone and marrow. Recently, transgenic mice, which expressed a truncated collagen X protein, were reported to exhibit morphologic alterations in all tissues arising through EO. Specifically, the growth plates were compressed within the zone of cartilage hypertrophy, and the number and size of calcified trabeculae were reduced. The condition in the mouse is comparable to Schmid metaphyseal chondrodysplasia in humans for which, to date, 20 defined type X collagen mutations have been reported. The transgenic mouse showed no alterations in mineralization by conventional histology, however, it did show a decrease in newly formed bony trabeculae, and a thinning of periosteal bones. Fourier transform infrared (FTIR) spectroscopy has previously been shown to provide quantitative and qualitative information about the relative amount of mineral and carbonate present, mineral composition, and crystal perfection. To determine whether the expression of abnormal collagen X molecules had an effect on mineral properties, the "quality" of mineral crystals was analyzed in thin sections of tibia from day 17 and day 25 genotypically negative (normal) and positive (mutant) mice from several independent transgenic mouse lines showing varying degrees of the mutant phenotype, by means of Fourier transform infrared microscopic analysis (FTIRM). The results indicate definite differences between normal and transgenic mice calcified cartilage mineral, both in the amount present and the "quality" of the crystals. Calcified cartilage mineral from transgenic mice exhibited less crystallinity and higher acidic phosphate content than the corresponding mineral from normal specimens.
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Affiliation(s)
- E P Paschalis
- Hospital for Special Surgery, New York, NY 10021, USA
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45
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Paschalis EP, Jacenko O, Olsen B, deCrombrugghe B, Boskey AL. The role of type X collagen in endochondral ossification as deduced by Fourier transform infrared microscopy analysis. Connect Tissue Res 1996; 35:371-7. [PMID: 9084677 DOI: 10.3109/03008209609029214] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Type X collagen has been implicated in the morphogenetic events of endochondral ossification (EO), including the calcification of hypertrophic cartilage and trabeculae prior to their replacement by bone and marrow. Recently, transgenic mice which expressed a truncated collagen X protein were reported to exhibit morphologic alterations in all tissues arising through EO. Fourier Transform InfraRed (FTIR) spectroscopy has previously been shown to provide quantitative and qualitative information about the relative amount of mineral and carbonate present, mineral composition, and crystal perfection. To determine the role of collagen X in mineralization, the "quality" of mineral crystals was analyzed in thin sections of calcified cartilage from tibia obtained from several independent transgenic mouse lines showing varying degrees of the mutant phenotype and mice without type X collagen expression, by means of Fourier Transform InfraRed microscopy (FTIRM). In the present paper, the term "mineral quality" is employed to describe crystallinity/crystal maturation, and acid phosphate content. The results indicate significant differences between normal and transgenic mice bone mineral, both in the amount present and the "quality" of the crystals. In contrast, the analysis of the mineral in mice without type X collagen expression was not different from their age/sex-matched controls.
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Affiliation(s)
- E P Paschalis
- Hospital for Special Surgery, Department of Ultrastructural Biochemistry, New York, NY 10021, USA
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46
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Thomas JT, Sweetman WA, Cresswell CJ, Wallis GA, Grant ME, Boot-Handford RP. Sequence comparison of three mammalian type-X collagen promoters and preliminary functional analysis of the human promoter. Gene 1995; 160:291-6. [PMID: 7642113 DOI: 10.1016/0378-1119(95)00189-d] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The mechanism(s) controlling the specific expression of the type-X collagen (COL10A1)-encoding gene in the growth plate of developing long bones is not known. In preparation for identifying and characterizing the 5'-regulatory sequences and transcription factors which control mammalian Col10a1 gene expression, we have isolated and sequenced the first exon and 5' flanking promoter regions of bovine Col10a1. Sequence comparisons, including those previously published for mouse Col10a1, highlighted a number of conserved domains within the promoter and upstream elements. Reporter cat gene (encoding chloramphenicol acetyltransferase, CAT) constructs containing 5'-regulatory sequences of human COL10a1 (hCOL10a1) were transfected into primary cultures of foetal bovine growth plate chondrocytes producing COL10A1 and non-producing epiphyseal cartilage chondrocytes. Constructs containing up to 900 bp of promoter sequence exhibited low levels of CAT production in expressing cells and non-expressing cells. Addition of a further 1.5 kb of upstream sequence resulted in a dramatic increase in CAT production in expressing cells only. The results demonstrate the presence of enhancer-like elements between 900 bp and 2.4 kb upstream of the transcription start point(s) of hCOL10a1, which is distinctly different from that reported for the chick.
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Affiliation(s)
- J T Thomas
- School of Biological Sciences, University of Manchester, UK
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Bonaventure J, Chaminade F, Maroteaux P. Mutations in three subdomains of the carboxy-terminal region of collagen type X account for most of the Schmid metaphyseal dysplasias. Hum Genet 1995; 96:58-64. [PMID: 7607655 DOI: 10.1007/bf00214187] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We have used the polymerase chain reaction and single strand conformation polymorphism (SSCP) methods to analyse the COL10A1 gene, which encodes collagen type X, in DNA samples from patients with metaphyseal dysplasia type Schmid (SMCD) and other related forms of metaphyseal dysplasia. Five cases of SMCD were sporadic and three others were familial. Abnormal SSCP profiles were observed in six instances. In two families, the altered pattern segregated with the phenotype. The heterozygous mutations corresponded to a glycine substitution by glutamic acid at position 595 and to an asparagine substitution by lysine at position 617. In one sporadic case, the sequence studies demonstrated that the individual was heterozygous for a single base deletion (del T 1908) that produced a premature stop codon. Three additional mutations were single base substitutions that affected highly conserved residues at positions 597, 644 and 648. In two additional individuals with SMCD, in two patients with unclassifiable forms of metaphyseal dysplasia, and in one family with epiphyso-metaphyseal dysplasia, SSCP analysis detected neutral polymorphisms in the entire coding sequence of the gene but no mutations. Our results demonstrate that mutations in the carboxy-terminal region of collagen X are specific for the SMCD phenotype. Mutations appear to be clustered into three small subdomains: one of them is rich an aromatic residues, the second includes the putative N-linked oligosaccharide attachment site and the third contains mostly hydrophilic residues. The absence of clinical variability between patients carrying heterozygous single base substitutions or small deletions suggests that, in both instances, the mutant collagen chains either fail to be incorporated into stable trimers or disturb type X collagen assembly.
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Affiliation(s)
- J Bonaventure
- CNRS ER 88, Tour Lavoisier, Hôpital Necker, Paris, France
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48
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Cheah KS, Levy A, Trainor PA, Wai AW, Kuffner T, So CL, Leung KK, Lovell-Badge RH, Tam PP. Human COL2A1-directed SV40 T antigen expression in transgenic and chimeric mice results in abnormal skeletal development. J Cell Biol 1995; 128:223-37. [PMID: 7822417 PMCID: PMC2120328 DOI: 10.1083/jcb.128.1.223] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The ability of SV40 T antigen to cause abnormalities in cartilage development in transgenic mice and chimeras has been tested. The cis-regulatory elements of the COL2A1 gene were used to target expression of SV40 T antigen to differentiating chondrocytes in transgenic mice and chimeras derived from embryonal stem (ES) cells bearing the same transgene. The major phenotypic consequences of transgenic (pAL21) expression are malformed skeleton, disproportionate dwarfism, and perinatal/neonatal death. Expression of T antigen was tissue specific and in the main characteristic of the mouse alpha 1(II) collagen gene. Chondrocyte densities and levels of alpha 1(II) collagen mRNAs were reduced in the transgenic mice. Islands of cells which express cartilage characteristic genes such as type IIB procollagen, long form alpha 1(IX) collagen, alpha 2(XI) collagen, and aggrecan were found in the articular and growth cartilages of pAL21 chimeric fetuses and neonates. But these cells, which were expressing T antigen, were not properly organized into columns of proliferating chondrocytes. Levels of alpha 1(II) collagen mRNA were reduced in these chondrocytes. In addition, these cells did not express type X collagen, a marker for hypertrophic chondrocytes. The skeletal abnormality in pAL21 mice may therefore be due to a retardation of chondrocyte maturation or an impaired ability of chondrocytes to complete terminal differentiation and an associated paucity of some cartilage matrix components.
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Affiliation(s)
- K S Cheah
- Department of Biochemistry, Hong Kong University
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49
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Sugimoto M, Oohashi T, Ninomiya Y. The genes COL4A5 and COL4A6, coding for basement membrane collagen chains alpha 5(IV) and alpha 6(IV), are located head-to-head in close proximity on human chromosome Xq22 and COL4A6 is transcribed from two alternative promoters. Proc Natl Acad Sci U S A 1994; 91:11679-83. [PMID: 7972123 PMCID: PMC45295 DOI: 10.1073/pnas.91.24.11679] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The genes for the alpha 5(IV) and alpha 6(IV) chains of human basement membrane collagen type IV have been found together on chromosome X at segment q22 and have been reported to be arranged in a head-to-head fashion. Here we report the 5' flanking sequences of COL4A5 and COL4A6 and that COL4A6 is transcribed from two alternative promoters in a tissue-specific fashion. Analysis of the sequence immediately upstream of the transcription start sites revealed some features of housekeeping genes--i.e., the lack of a TATA motif and the presence of CCAAT and CTC boxes. Further analysis revealed that COL4A6 contains two alternative promoters that control the generation of two different transcripts. One transcription start site (from exon 1') is 442 bp away from the transcription start site of COL4A5, while an alternative transcription start site (from exon 1) is located 1050 bp from the first one and drives the expression of a second transcript that encodes an alpha 6(IV) chain with a different signal peptide. Reverse transcription-PCR experiments revealed that the transcript from exon 1' is abundant in placenta, whereas the transcript from exon 1 is more frequently found in kidney and lung. These results provide additional clues to answering the general question of what mechanisms are used to generate unique basement membrane structures in different tissues.
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Affiliation(s)
- M Sugimoto
- Department of Molecular Biology, Okayama University Medical School, Japan
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50
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Smith KF, Haris PI, Chapman D, Reid KB, Perkins SJ. Beta-sheet secondary structure of the trimeric globular domain of C1q of complement and collagen types VIII and X by Fourier-transform infrared spectroscopy and averaged structure predictions. Biochem J 1994; 301 ( Pt 1):249-56. [PMID: 8037678 PMCID: PMC1137169 DOI: 10.1042/bj3010249] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
C1q plays a key role in the recognition of immune complexes, thereby initiating the classical pathway of complement activation. Although the triple-helix conformation of its N-terminal segment is well established, the secondary structure of the trimeric globular C-terminal domain is as yet unknown. The secondary structures of human C1q and C1q stalks and pepsin-extracted human collagen types I, III and IV (with no significant non-collagen-like structure) were studied by Fourier-transform i.r. spectroscopy in 2H2O buffers. After second-derivative calculation to resolve the fine structure of the broad amide I band, the Fourier-transform i.r. spectrum of C1q showed two major bands, one at 1637 cm-1, which is a characteristic frequency for beta-sheets, and one at 1661 cm-1. Both major bands were also detected for Clq in H2O buffers. Only the second major band was observed at 1655 cm-1 in pepsin-digested C1q which contains primarily the N-terminal triple-helix region. The Fourier-transform i.r. spectra of collagen in 2H2O also showed a major band at 1659 cm-1 (and minor bands at 1632 cm-1 and 1682 cm-1). It is concluded that the C1q globular heads contain primarily beta-sheet structure. The C-terminal domains of C1q show approximately 25% sequence identity with the non-collagen-like C-terminal regions of the short-chain collagen types VIII and X. To complement the Fourier-transform-i.r. spectroscopic data, averaged Robson and Chou-Fasman structure predictions on 15 similar sequences for the globular domains of C1q and collagen types VIII and X were performed. These showed a clear pattern of ten beta-strands interspersed by beta-turns and /or loops. Residues thought to be important for C1q-immune complex interactions with IgG and IgM were predicted to be at a surface-exposed loop. Sequence insertions and deletions, glycosylation sites, the free cysteine residue and RGD recognition sequences were also predicted to be at surface-exposed positions.
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Affiliation(s)
- K F Smith
- Department of Biochemistry and Chemistry, Royal Free Hospital School of Medicine, London, U.K
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