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Hasan MR, Koskenranta A, Alakurtti K, Takatalo M, Rice DP. RAB23 regulates musculoskeletal development and patterning. Front Cell Dev Biol 2023; 11:1049131. [PMID: 36910145 PMCID: PMC9995984 DOI: 10.3389/fcell.2023.1049131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 02/07/2023] [Indexed: 02/25/2023] Open
Abstract
RAB23 is a small GTPase which functions at the plasma membrane to regulate growth factor signaling. Mutations in RAB23 cause Carpenter syndrome, a condition that affects normal organogenesis and patterning. In this study, we investigate the role of RAB23 in musculoskeletal development and show that it is required for patella bone formation and for the maintenance of tendon progenitors. The patella is the largest sesamoid bone in mammals and plays a critical role during movement by providing structural and mechanical support to the knee. Rab23 -/- mice fail to form a patella and normal knee joint. The patella is formed from Sox9 and scleraxis (Scx) double-positive chondroprogenitor cells. We show that RAB23 is required for the specification of SOX9 and scleraxis double-positive patella chondroprogenitors during the formation of patella anlagen and the subsequent establishment of patellofemoral joint. We find that scleraxis and SOX9 expression are disrupted in Rab23 -/- mice, and as a result, development of the quadriceps tendons, cruciate ligaments, patella tendons, and entheses is either abnormal or lost. TGFβ-BMP signaling is known to regulate patella initiation and patella progenitor differentiation and growth. We find that the expression of TGFβR2, BMPR1, BMP4, and pSmad are barely detectable in the future patella site and in the rudimentary tendons and ligaments around the patellofemoral joint in Rab23 -/- mice. Also, we show that GLI1, SOX9, and scleraxis, which regulate entheses establishment and maturation, are weakly expressed in Rab23 -/- mice. Further analysis of the skeletal phenotype of Rab23 -/- mice showed a close resemblance to that of Tgfβ2 -/- mice, highlighting a possible role for RAB23 in regulating TGFβ superfamily signaling.
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Affiliation(s)
- Md Rakibul Hasan
- Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
| | - Anna Koskenranta
- Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
| | - Kirsi Alakurtti
- Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
| | - Maarit Takatalo
- Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland
| | - David P Rice
- Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland.,Helsinki University Hospital, Helsinki, Finland
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Couasnay G, Madel MB, Lim J, Lee B, Elefteriou F. Sites of Cre-recombinase activity in mouse lines targeting skeletal cells. J Bone Miner Res 2021; 36:1661-1679. [PMID: 34278610 DOI: 10.1002/jbmr.4415] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 07/12/2021] [Accepted: 07/15/2021] [Indexed: 12/22/2022]
Abstract
The Cre/Lox system is a powerful tool in the biologist's toolbox, allowing loss-of-function and gain-of-function studies, as well as lineage tracing, through gene recombination in a tissue-specific and inducible manner. Evidence indicates, however, that Cre transgenic lines have a far more nuanced and broader pattern of Cre activity than initially thought, exhibiting "off-target" activity in tissues/cells other than the ones they were originally designed to target. With the goal of facilitating the comparison and selection of optimal Cre lines to be used for the study of gene function, we have summarized in a single manuscript the major sites and timing of Cre activity of the main Cre lines available to target bone mesenchymal stem cells, chondrocytes, osteoblasts, osteocytes, tenocytes, and osteoclasts, along with their reported sites of "off-target" Cre activity. We also discuss characteristics, advantages, and limitations of these Cre lines for users to avoid common risks related to overinterpretation or misinterpretation based on the assumption of strict cell-type specificity or unaccounted effect of the Cre transgene or Cre inducers. © 2021 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Greig Couasnay
- Department of Orthopedic Surgery, Baylor College of Medicine, Houston, TX, USA
| | | | - Joohyun Lim
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Brendan Lee
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Florent Elefteriou
- Department of Orthopedic Surgery, Baylor College of Medicine, Houston, TX, USA
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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Zhang Y, Annusver K, Sunadome K, Kameneva P, Edwards S, Lei G, Kasper M, Chagin AS, Adameyko I, Xie M. Epiphyseal Cartilage Formation Involves Differential Dynamics of Various Cellular Populations During Embryogenesis. Front Cell Dev Biol 2020; 8:122. [PMID: 32211405 PMCID: PMC7066500 DOI: 10.3389/fcell.2020.00122] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 02/12/2020] [Indexed: 11/17/2022] Open
Abstract
A joint connects two or more bones together to form a functional unit that allows different types of bending and movement. Little is known about how the opposing ends of the connected bones are developed. Here, applying various lineage tracing strategies we demonstrate that progenies of Gdf5-, Col2-, Prrx1-, and Gli1-positive cells contribute to the growing epiphyseal cartilage in a spatially asymmetrical manner. In addition, we reveal that cells in the cartilaginous anlagen are likely to be the major sources for epiphyseal cartilage. Moreover, Gli1-positive cells are found to proliferate along the skeletal edges toward the periarticular region of epiphyseal surface. Finally, a switch in the mechanism of growth from cell division to cell influx likely occurs in the epiphyseal cartilage when joint cavitation has completed. Altogether, our findings reveal an asymmetrical mechanism of growth that drives the formation of epiphyseal cartilage ends, which might implicate on how the articular surface of these skeletal elements acquires their unique and sophisticated shape during embryonic development.
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Affiliation(s)
- Yi Zhang
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden
| | - Karl Annusver
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Kazunori Sunadome
- Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden
| | - Polina Kameneva
- Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden
| | - Steven Edwards
- Light Sheet Microscopy Pilot Facility at SciLifeLab, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Guanghua Lei
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Maria Kasper
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Andrei S Chagin
- Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden.,Institute for Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Igor Adameyko
- Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden.,Department of Molecular Neurosciences, Medical University of Vienna, Vienna, Austria
| | - Meng Xie
- Department of Physiology and Pharmacology, Karolinska Institutet, Solna, Sweden
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