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Siravo E. Editorial for "Generalizing Diffusion Tensor Imaging of the Physis and Metaphysis". J Magn Reson Imaging 2024. [PMID: 38795378 DOI: 10.1002/jmri.29459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 05/27/2024] Open
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Tao D, Zhang L, Ding Y, Tang N, Xu X, Li G, Niu P, Yue R, Wang X, Shen Y, Sun Y. Primary cilia support cartilage regeneration after injury. Int J Oral Sci 2023; 15:22. [PMID: 37268650 DOI: 10.1038/s41368-023-00223-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 03/24/2023] [Indexed: 06/04/2023] Open
Abstract
In growing children, growth plate cartilage has limited self-repair ability upon fracture injury always leading to limb growth arrest. Interestingly, one type of fracture injuries within the growth plate achieve amazing self-healing, however, the mechanism is unclear. Using this type of fracture mouse model, we discovered the activation of Hedgehog (Hh) signaling in the injured growth plate, which could activate chondrocytes in growth plate and promote cartilage repair. Primary cilia are the central transduction mediator of Hh signaling. Notably, ciliary Hh-Smo-Gli signaling pathways were enriched in the growth plate during development. Moreover, chondrocytes in resting and proliferating zone were dynamically ciliated during growth plate repair. Furthermore, conditional deletion of the ciliary core gene Ift140 in cartilage disrupted cilia-mediated Hh signaling in growth plate. More importantly, activating ciliary Hh signaling by Smoothened agonist (SAG) significantly accelerated growth plate repair after injury. In sum, primary cilia mediate Hh signaling induced the activation of stem/progenitor chondrocytes and growth plate repair after fracture injury.
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Affiliation(s)
- Dike Tao
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Lei Zhang
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Yunpeng Ding
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Na Tang
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xiaoqiao Xu
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Gongchen Li
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
- Department of Oral and Maxillofacial Surgery, School & Hospital of Stomatology, Tongji University, Shanghai, China
| | - Pingping Niu
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Rui Yue
- Institute for Regenerative Medicine, Shanghai East Hospital, Frontier Science Center for Stem Cell Research, Shanghai Key Laboratory of Signaling and Disease Research, School of Life Sciences and Technology, Tongji University, Shanghai, China
- Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai, China
| | - Xiaogang Wang
- Key Laboratory of Big Data-Based Precision Medicine, School of Engineering Medicine, Beihang University, Beijing, China
| | - Yidong Shen
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yao Sun
- Department of Implantology, School & Hospital of Stomatology, Tongji University, Shanghai, China.
- Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China.
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Tiffany AS, Harley BA. Growing Pains: The Need for Engineered Platforms to Study Growth Plate Biology. Adv Healthc Mater 2022; 11:e2200471. [PMID: 35905390 PMCID: PMC9547842 DOI: 10.1002/adhm.202200471] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 07/11/2022] [Indexed: 01/27/2023]
Abstract
Growth plates, or physis, are highly specialized cartilage tissues responsible for longitudinal bone growth in children and adolescents. Chondrocytes that reside in growth plates are organized into three distinct zones essential for proper function. Modeling key features of growth plates may provide an avenue to develop advanced tissue engineering strategies and perspectives for cartilage and bone regenerative medicine applications and a platform to study processes linked to disease progression. In this review, a brief introduction of the growth plates and their role in skeletal development is first provided. Injuries and diseases of the growth plates as well as physiological and pathological mechanisms associated with remodeling and disease progression are discussed. Growth plate biology, namely, its architecture and extracellular matrix organization, resident cell types, and growth factor signaling are then focused. Next, opportunities and challenges for developing 3D biomaterial models to study aspects of growth plate biology and disease in vitro are discussed. Finally, opportunities for increasingly sophisticated in vitro biomaterial models of the growth plate to study spatiotemporal aspects of growth plate remodeling, to investigate multicellular signaling underlying growth plate biology, and to develop platforms that address key roadblocks to in vivo musculoskeletal tissue engineering applications are described.
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Affiliation(s)
- Aleczandria S. Tiffany
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Brendan A.C. Harley
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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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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Varsano N, Kahil K, Haimov H, Rechav K, Addadi L, Weiner S. Characterization of the growth plate-bone interphase region using cryo-FIB SEM 3D volume imaging. J Struct Biol 2021; 213:107781. [PMID: 34411695 DOI: 10.1016/j.jsb.2021.107781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/10/2021] [Accepted: 08/11/2021] [Indexed: 11/27/2022]
Abstract
The interphase region at the base of the growth plate includes blood vessels, cells and mineralized tissues. In this region, cartilage is mineralized and replaced with bone. Blood vessel extremities permeate this space providing nutrients, oxygen and signaling factors. All these different components form a complex intertwined 3D structure. Here we use cryo-FIB SEM to elaborate this 3D structure without removing the water. As it is challenging to image mineralized and unmineralized tissues in a hydrated state, we provide technical details of the parameters used. We obtained two FIB SEM image stacks that show that the blood vessels are in intimate contact not only with cells, but in some locations also with mineralized tissues. There are abundant red blood cells at the extremities of the vessels. We also documented large multinucleated cells in contact with mineralized cartilage and possibly also with bone. We observed membrane bound mineralized particles in these cells, as well as in blood serum, but not in the hypertrophic chondrocytes. We confirm that there is an open pathway from the blood vessel extremities to the mineralizing cartilage. Based on the sparsity of the mineralized particles, we conclude that mainly ions in solution are used for mineralizing cartilage and bone, but these are augmented by the supply of mineralized particles.
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Affiliation(s)
- Neta Varsano
- Department of Chemical and Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Keren Kahil
- Department of Chemical and Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Heden Haimov
- Department of Chemical and Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Katya Rechav
- Department of Chemical Research Support, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Lia Addadi
- Department of Chemical and Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel
| | - Steve Weiner
- Department of Chemical and Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel.
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Abstract
The growth plate is the cartilaginous portion of long bones where the longitudinal growth of the bone takes place. Its structure comprises chondrocytes suspended in a collagen matrix that go through several stages of maturation until they finally die, and are replaced by osteoblasts, osteoclasts, and lamellar bone.The process of endochondral ossification is coordinated by chondrocytes and a variety of humoral factors including growth hormone, parathyroid hormone, oestrogen, growth factors, cytokines, and various signalling pathways.Chondrocytes progress from a resting state to enter the phases of proliferation and hypertrophy. Under the influence of oestrogen, the proliferation of chondrocytes decreases as the resting chondrocytes are consumed. During the terminal phase of differentiation, cartilage is replaced by blood vessels and organized bone tissue, and once chondrocytes have died, the longitudinal growth of the bone ceases and the growth plate closes.The highly complex regulatory signals involved in this process are genetically determined, and genetic perturbations in any of the associated genes can result in abnormalities of bone growth. Hundreds of chondrodysplasias have been described, pointing to the complexity of the humoral control systems involved in endochondral ossification.While our knowledge of the mechanisms behind the various bone growth control systems is improving, a deeper understanding of the underlying processes could aid clinicians to better understand bone health and bone growth abnormalities. This review describes the current clinical research into the physiology of the growth plate. Cite this article: EFORT Open Rev 2020;5:498-507. DOI: 10.1302/2058-5241.5.190088.
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Affiliation(s)
- Yücel Ağırdil
- Department of Orthopaedics and Traumatology, İzzet Baysal State Hospital, Bolu, Turkey
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Jo SY, Domowicz MS, Henry JG, Schwartz NB. The Role of Dot1l in Prenatal and Postnatal Murine Chondrocytes and Trabecular Bone. JBMR Plus 2019; 4:e10254. [PMID: 32083237 PMCID: PMC7017886 DOI: 10.1002/jbm4.10254] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 11/02/2019] [Accepted: 11/08/2019] [Indexed: 12/19/2022] Open
Abstract
Osteoarthritis and osteoporosis are widely prevalent and have far-reaching public health implications. There is increasing evidence that epigenetics, in particular, histone 3 lysine 79 methyltransferase DOT1L, plays an important role in the cartilage and bone biology. In this study, we evaluated the role of Dot1l in the articular cartilage, growth plate, and trabecular bone utilizing conditional KO mouse models. We generated chondrocyte-specific constitutive and inducible conditional Dot1l KO mouse lines using Col2a1-Cre and Acan-CreER systems. Prenatal deletion of Dot1l in mouse chondrocytes led to perinatal mortality, accelerated ossification, and dysregulation of Col10a1 expression. Postnatal deletion of Dot1l in mouse chondrocytes resulted in trabecular bone loss decreased extracellular matrix production, and disruption of the growth plate. In addition, pharmacological inhibition of DOT1L in a progeria mouse model partially rescued the abnormal osseous phenotype. In conclusion, Dot1l is important in maintaining the growth plate, extracellular matrix production, and trabecular bone. © 2019 The Authors. JBMR Plus published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Stephanie Y Jo
- Department of Radiology University of Pennsylvania Philadelphia PA USA.,Department of Radiology University of Chicago Chicago IL USA
| | | | - Judith G Henry
- Department of Pediatrics University of Chicago Chicago IL USA
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Kraus T, Fischerauer S, Treichler S, Martinelli E, Eichler J, Myrissa A, Zötsch S, Uggowitzer PJ, Löffler JF, Weinberg AM. The influence of biodegradable magnesium implants on the growth plate. Acta Biomater 2018; 66:109-117. [PMID: 29174472 DOI: 10.1016/j.actbio.2017.11.031] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 11/18/2017] [Accepted: 11/20/2017] [Indexed: 11/17/2022]
Abstract
Mg-based biodegradable materials are considered promising candidates in the paediatric field due to their favourable mechanical and biological properties and their biodegrading potential that makes a second surgery for implant removal unnecessary. In many cases the surgical fixation technique requires a crossing of the growth plate by the implant in order to achieve an adequate fragment replacement or fracture stabilisation. This study investigates the kinetics of slowly and rapidly degrading Mg alloys in a transphyseal rat model, and also reports on their dynamics in the context of the physis and consecutive bone growth. Twenty-six male Sprague-Dawley rats received either a rapidly degrading (ZX50; n = 13) or a slowly degrading (WZ21; n = 13) Mg alloy, implanted transphyseal into the distal femur. The contralateral leg was drilled in the same manner and served as a direct sham specimen. Degradation behaviour, gas formation, and leg length were measured by continuous in vivo micro CT for up to 52 weeks, and additional high-resolution µCT (HRS) scans and histomorphological analyses of the growth plate were performed. The growth plate was locally destroyed and bone growth was significantly diminished by the fast degradation of ZX50 implants and the accompanying release of large amounts of hydrogen gas. In contrast, WZ21 implants showed homogenous and moderate degradation performance, and the effect on bone growth did not differ significantly from a single drill-hole defect. STATEMENT OF SIGNIFICANCE This study is the first that reports on the effects of degrading magnesium implants on the growth plate in a living animal model. The results show that high evolution of hydrogen gas due to rapid Mg degradation can damage the growth plate substantially. Slow degradation, however, such as seen for WZ21 alloys, does not affect the growth plate more than drilling alone, thus meeting one important prerequisite for deployment in paediatric osteosynthesis.
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Affiliation(s)
- Tanja Kraus
- Department of Paediatric Orthopaedics, Medical University Graz, 8036 Graz, Austria.
| | - Stefan Fischerauer
- Department of Trauma Surgery, Medical University Graz, 8036 Graz, Austria
| | - Stefan Treichler
- Department of Orthopaedics, Medical University Graz, 8036 Graz, Austria
| | | | - Johannes Eichler
- Department of Orthopaedics, Medical University Graz, 8036 Graz, Austria
| | - Anastasia Myrissa
- Department of Orthopaedics, Medical University Graz, 8036 Graz, Austria
| | - Silvia Zötsch
- Department of Paediatric and Adolescent Surgery, Medical University Graz, 8036 Graz, Austria
| | - Peter J Uggowitzer
- Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Jörg F Löffler
- Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
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Cellular scale model of growth plate: An in silico model of chondrocyte hypertrophy. J Theor Biol 2017; 428:87-97. [PMID: 28526527 DOI: 10.1016/j.jtbi.2017.05.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 03/14/2017] [Accepted: 05/09/2017] [Indexed: 02/03/2023]
Abstract
The growth plate is the responsible for longitudinal bone growth. It is a cartilaginous structure formed by chondrocytes that are continuously undergoing a differentiation process that starts with a highly proliferative state, followed by cellular hypertrophy, and finally tissue ossification. Within the growth plate chondrocytes display a characteristic columnar organization that potentiates longitudinal growth. Both chondrocyte organization and hypertrophy are highly regulated processes influenced by biochemical and mechanical stimuli. These processes have been studied mainly using in vivo models, although there are few computational approaches focused on the rate of ossification rather than events at cellular level. Here, we developed a model of cellular behavior integrating biochemical and structural factors in a single column of cells in the growth plate. In our model proliferation and hypertrophy were controlled by biochemical regulatory loop formed between Ihh and PTHrP (modeled as a set of reaction-diffusion equations), while cell growth was controlled by mechanical loading. We also examined the effects of static loading. The model reproduced the proliferation and hypertrophy of chondrocytes in organized columns. This model constitutes a first step towards the development of mechanobiological models that can be used to study biochemical interactions during endochondral ossification.
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