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Torell F, Dimitriou M. Local muscle pressure stimulates the principal receptors for proprioception. Cell Rep 2024; 43:114699. [PMID: 39213153 DOI: 10.1016/j.celrep.2024.114699] [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: 02/14/2024] [Revised: 06/11/2024] [Accepted: 08/14/2024] [Indexed: 09/04/2024] Open
Abstract
Proprioception plays a crucial role in motor coordination and self-perception. Muscle spindles are the principal receptors for proprioception. They are believed to encode muscle stretch and signal limb position and velocity. Here, we applied percutaneous pressure to a small area of extensor muscles at the forearm while recording spindle afferent responses, skeletal muscle activity, and hand kinematics. Three levels of sustained pressure were applied on the spindle-bearing muscle when the hand was relaxed and immobile ("isometric" condition) and when the participant's hand moved rhythmically at the wrist. As hypothesized to occur due to compression of the spindle capsule, we show that muscle pressure is an "adequate" stimulus for human spindles in isometric conditions and that pressure enhances spindle responses during stretch. Interestingly, release of sustained pressure in isometric conditions lowered spindle firing below baseline rates. Our findings urge a re-evaluation of muscle proprioception in sensorimotor function and various neuromuscular pathologies.
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Affiliation(s)
- Frida Torell
- Department of Medical and Translational Biology, Umeå University, 901 87 Umeå, Sweden
| | - Michael Dimitriou
- Department of Medical and Translational Biology, Umeå University, 901 87 Umeå, Sweden.
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2
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Zhang T, Sui W, Li B, Shao X, Deng Y, Zhang Z, Yang J, Huang Z, Yang W, Yang J. The morphological discrepancy of neuromuscular junctions between bilateral paraspinal muscles in patients with adolescent idiopathic scoliosis: A quantitative immunofluorescence assay. JOR Spine 2024; 7:e1358. [PMID: 39011366 PMCID: PMC11247395 DOI: 10.1002/jsp2.1358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 05/23/2024] [Accepted: 07/01/2024] [Indexed: 07/17/2024] Open
Abstract
Introduction Prior studies suggested that neuromuscular factors might be involved in the pathogenesis of adolescent idiopathic scoliosis (AIS). The neuromuscular junction (NMJ) is the important pivot where the nervous system interacts with muscle fibers, but it has not been well characterized in the paraspinal muscles of AIS. This study aims to perform the quantitative morphological analysis of NMJs from paraspinal muscles of AIS. Methods AIS patients who received surgery in our center were prospectively enrolled. Meanwhile, age-matched congenital scoliosis (CS) and non-scoliosis patients were also included as controls. Fresh samples of paraspinal muscles were harvested intraoperatively. NMJs were immunolabeled using different antibodies to reveal pre-synaptic neuronal architecture and post-synaptic motor endplates. A confocal microscope was used to acquire z-stack projections of NMJs images. Then, NMJs images were analyzed on maximum intensity projections using ImageJ software. The morphology of NMJs was quantitatively measured by a standardized 'NMJ-morph' workflow. A total of 21 variables were measured and compared between different groups. Results A total of 15 AIS patients, 10 CS patients and 5 normal controls were enrolled initially. For AIS group, NMJs in the convex side of paraspinal muscles demonstrated obviously decreased overlap when compared with the concave side (34.27% ± 8.09% vs. 48.11% ± 10.31%, p = 0.0036). However, no variables showed statistical difference between both sides of paraspinal muscles in CS patients. In contrast with non-scoliosis controls, both sides of paraspinal muscles in AIS patients demonstrated significantly smaller muscle bundle diameters. Conclusions This study first elucidated the morphological features of NMJs from paraspinal muscles of AIS patients. The NMJs in the convex side showed smaller overlap for AIS patients, but no difference was found in CS. This proved further evidence that neuromuscular factors might contribute to the mechanisms of AIS and could be considered as a novel potential therapeutic target for the treatment of progressive AIS.
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Affiliation(s)
- Tianyuan Zhang
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Wenyuan Sui
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Bin Li
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Xiexiang Shao
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Yaolong Deng
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Zifang Zhang
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Jingfan Yang
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Zifang Huang
- Department of Spine Surgery The Third Affiliated Hospital of Sun Yat-sen University Guangzhou China
| | - Wenjun Yang
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
| | - Junlin Yang
- Spine Center, Department of Pediatric Orthopedics Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine Shanghai China
- Department of Spine Surgery The Third Affiliated Hospital of Sun Yat-sen University Guangzhou China
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3
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Proske U. Joint receptors play a role in position sense after all! J Physiol 2024; 602:3609-3612. [PMID: 38857461 DOI: 10.1113/jp286961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2024] [Accepted: 05/29/2024] [Indexed: 06/12/2024] Open
Affiliation(s)
- Uwe Proske
- School of Biomedical Sciences, Monash University, Clayton, VIC, Australia
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Mete O, Işik H, Pirinççi CŞ, Yaşa ME, Sapmaz E. Spinal posture, mobility, and position sense in adolescents with chest wall deformities: a comparison of pectus excavatum, pectus carinatum and healthy peers. Pediatr Surg Int 2024; 40:178. [PMID: 38970642 PMCID: PMC11227458 DOI: 10.1007/s00383-024-05759-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/25/2024] [Indexed: 07/08/2024]
Abstract
PURPOSE The study aimed to compare spinal posture, mobility, and position sense in adolescents with pectus excavatum (PE), pectus carinatum (PC), and healthy control (HC). METHODS 22 with PE, 22 with PC, and 21 HC were included in the study. The spinal posture (thoracic kyphosis, lumbar lordosis, pelvic tilt, thoracic, lumbar, pelvic lateral tilt angles) and mobility (thoracic, lumbar, hip/sacral, and overall, in the sagittal and frontal plane) with the spinal mouse, and spinal position sense (repositing errors) with the inclinometer were assessed. RESULTS The thoracic kyphosis angle of PE and PC was higher than in HC (p < 0.001; p = 0.001). Hip/sacral mobility in the sagittal plane was lower in the PE and PC than control, respectively (p < 0.001; p < 0.001). Overall sagittal spinal mobility (p:0.007) and hip/sacral mobility in the frontal plane (p:0.002) were lower in the PC than in HC. Overall frontal spinal mobility was lower in the PE and PC than in HC (p:0.002; p:0.014). The PE and PC repositing errors were higher (p < 0.001; p:0.014). CONCLUSION The study found that adolescents with PE and PC had decreased spinal mobility, spinal alignment disorders, and a decline in spinal position sense. It is important not to overlook the spine during physical examinations of adolescents with chest wall deformities. In clinical practice, we suggest that adolescents with chest deformities should undergo a spine evaluation and be referred for physical therapy to manage spinal disorders.
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Affiliation(s)
- Oguzhan Mete
- Cardiopulmonary Physiotherapy and Rehabilitation Department, Gülhane Faculty of Physiotherapy and Rehabilitation, University of Health Sciences, Ankara, Turkey.
| | - Hakan Işik
- Department of Thoracic Surgery, Gülhane Training and Research Hospital, Ankara, Turkey
| | - Cansu Şahbaz Pirinççi
- Cardiopulmonary Physiotherapy and Rehabilitation Department, Gülhane Faculty of Physiotherapy and Rehabilitation, University of Health Sciences, Ankara, Turkey
| | - Mustafa Ertuğrul Yaşa
- Cardiopulmonary Physiotherapy and Rehabilitation Department, Gülhane Faculty of Physiotherapy and Rehabilitation, University of Health Sciences, Ankara, Turkey
| | - Ersin Sapmaz
- Department of Thoracic Surgery, Gülhane Training and Research Hospital, Ankara, Turkey
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5
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McCallum-Loudeac J, Moody E, Williams J, Johnstone G, Sircombe KJ, Clarkson AN, Wilson MJ. Deletion of a conserved genomic region associated with adolescent idiopathic scoliosis leads to vertebral rotation in mice. Hum Mol Genet 2024; 33:787-801. [PMID: 38280229 PMCID: PMC11031364 DOI: 10.1093/hmg/ddae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 12/15/2023] [Accepted: 01/12/2024] [Indexed: 01/29/2024] Open
Abstract
Adolescent idiopathic scoliosis (AIS) is the most common form of scoliosis, in which spinal curvature develops in adolescence, and 90% of patients are female. Scoliosis is a debilitating disease that often requires bracing or surgery in severe cases. AIS affects 2%-5.2% of the population; however, the biological origin of the disease remains poorly understood. In this study, we aimed to determine the function of a highly conserved genomic region previously linked to AIS using a mouse model generated by CRISPR-CAS9 gene editing to knockout this area of the genome to understand better its contribution to AIS, which we named AIS_CRMΔ. We also investigated the upstream factors that regulate the activity of this enhancer in vivo, whether the spatial expression of the LBX1 protein would change with the loss of AIS-CRM function, and whether any phenotype would arise after deletion of this region. We found a significant increase in mRNA expression in the developing neural tube at E10.5, and E12.5, for not only Lbx1 but also other neighboring genes. Adult knockout mice showed vertebral rotation and proprioceptive deficits, also observed in human AIS patients. In conclusion, our study sheds light on the elusive biological origins of AIS, by targeting and investigating a highly conserved genomic region linked to AIS in humans. These findings provide valuable insights into the function of the investigated region and contribute to our understanding of the underlying causes of this debilitating disease.
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Affiliation(s)
- Jeremy McCallum-Loudeac
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Edward Moody
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Jack Williams
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Georgia Johnstone
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Kathleen J Sircombe
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Andrew N Clarkson
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Megan J Wilson
- Department of Anatomy, School of Biomedical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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Ushiki A, Sheng RR, Zhang Y, Zhao J, Nobuhara M, Murray E, Ruan X, Rios JJ, Wise CA, Ahituv N. Deletion of Pax1 scoliosis-associated regulatory elements leads to a female-biased tail abnormality. Cell Rep 2024; 43:113907. [PMID: 38461417 PMCID: PMC11005513 DOI: 10.1016/j.celrep.2024.113907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 12/29/2023] [Accepted: 02/19/2024] [Indexed: 03/12/2024] Open
Abstract
Adolescent idiopathic scoliosis (AIS), a sideways curvature of the spine, is sexually dimorphic, with increased incidence in females. A genome-wide association study identified a female-specific AIS susceptibility locus near the PAX1 gene. Here, we use mouse enhancer assays, three mouse enhancer knockouts, and subsequent phenotypic analyses to characterize this region. Using mouse enhancer assays, we characterize a sequence, PEC7, which overlaps the AIS-associated variant, and find it to be active in the tail tip and intervertebral disc. Removal of PEC7 or Xe1, a known sclerotome enhancer nearby, or deletion of both sequences lead to a kinky tail phenotype only in the Xe1 and combined (Xe1+PEC7) knockouts, with only the latter showing a female sex dimorphic phenotype. Extensive phenotypic characterization of these mouse lines implicates several differentially expressed genes and estrogen signaling in the sex dimorphic bias. In summary, our work functionally characterizes an AIS-associated locus and dissects the mechanism for its sexual dimorphism.
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Affiliation(s)
- Aki Ushiki
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Rory R Sheng
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Yichi Zhang
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA; School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China
| | - Jingjing Zhao
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Mai Nobuhara
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Elizabeth Murray
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Xin Ruan
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Jonathan J Rios
- Center for Translational Research, Scottish Rite for Children, Dallas, TX 75390, USA; Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Carol A Wise
- Center for Translational Research, Scottish Rite for Children, Dallas, TX 75390, USA; Department of Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Nadav Ahituv
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA; Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA.
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7
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Wang X, Yue M, Cheung JPY, Cheung PWH, Fan Y, Wu M, Wang X, Zhao S, Khanshour AM, Rios JJ, Chen Z, Wang X, Tu W, Chan D, Yuan Q, Qin D, Qiu G, Wu Z, Zhang TJ, Ikegawa S, Wu N, Wise CA, Hu Y, Luk KDK, Song YQ, Gao B. Impaired glycine neurotransmission causes adolescent idiopathic scoliosis. J Clin Invest 2024; 134:e168783. [PMID: 37962965 PMCID: PMC10786698 DOI: 10.1172/jci168783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 11/08/2023] [Indexed: 11/16/2023] Open
Abstract
Adolescent idiopathic scoliosis (AIS) is the most common form of spinal deformity, affecting millions of adolescents worldwide, but it lacks a defined theory of etiopathogenesis. Because of this, treatment of AIS is limited to bracing and/or invasive surgery after onset. Preonset diagnosis or preventive treatment remains unavailable. Here, we performed a genetic analysis of a large multicenter AIS cohort and identified disease-causing and predisposing variants of SLC6A9 in multigeneration families, trios, and sporadic patients. Variants of SLC6A9, which encodes glycine transporter 1 (GLYT1), reduced glycine-uptake activity in cells, leading to increased extracellular glycine levels and aberrant glycinergic neurotransmission. Slc6a9 mutant zebrafish exhibited discoordination of spinal neural activities and pronounced lateral spinal curvature, a phenotype resembling human patients. The penetrance and severity of curvature were sensitive to the dosage of functional glyt1. Administration of a glycine receptor antagonist or a clinically used glycine neutralizer (sodium benzoate) partially rescued the phenotype. Our results indicate a neuropathic origin for "idiopathic" scoliosis, involving the dysfunction of synaptic neurotransmission and central pattern generators (CPGs), potentially a common cause of AIS. Our work further suggests avenues for early diagnosis and intervention of AIS in preadolescents.
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Affiliation(s)
- Xiaolu Wang
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
- School of Biomedical Sciences, Faculty of Medicine, Chinese University of Hong Kong, Shatin, Hong Kong, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Ming Yue
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Jason Pui Yin Cheung
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
- Department of Orthopaedics and Traumatology, University of Hong Kong–Shenzhen Hospital, Shenzhen, China
| | - Prudence Wing Hang Cheung
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Yanhui Fan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Meicheng Wu
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Xiaojun Wang
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Sen Zhao
- Department of Orthopaedic Surgery, Department of Medical Research Center, Key Laboratory of Big Data for Spinal Deformities, State Key Laboratory of Complex Severe and Rare Diseases, Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Peking Union Medical College Hospital (PUMCH) and Chinese Academy of Medical Sciences, Beijing, China
| | - Anas M. Khanshour
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children (SRC), Dallas, Texas, USA
| | - Jonathan J. Rios
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children (SRC), Dallas, Texas, USA
- Eugene McDermott Center for Human Growth and Development, Departments of Orthopaedic Surgery and Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Zheyi Chen
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Xiwei Wang
- Department of Paediatrics and Adolescent Medicine, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Wenwei Tu
- Department of Paediatrics and Adolescent Medicine, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Danny Chan
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Qiuju Yuan
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Tai Po, Hong Kong, China
| | - Dajiang Qin
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science & Innovation, Chinese Academy of Sciences, Tai Po, Hong Kong, China
| | - Guixing Qiu
- Department of Orthopaedic Surgery, Department of Medical Research Center, Key Laboratory of Big Data for Spinal Deformities, State Key Laboratory of Complex Severe and Rare Diseases, Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Peking Union Medical College Hospital (PUMCH) and Chinese Academy of Medical Sciences, Beijing, China
| | - Zhihong Wu
- Department of Orthopaedic Surgery, Department of Medical Research Center, Key Laboratory of Big Data for Spinal Deformities, State Key Laboratory of Complex Severe and Rare Diseases, Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Peking Union Medical College Hospital (PUMCH) and Chinese Academy of Medical Sciences, Beijing, China
| | - Terry Jianguo Zhang
- Department of Orthopaedic Surgery, Department of Medical Research Center, Key Laboratory of Big Data for Spinal Deformities, State Key Laboratory of Complex Severe and Rare Diseases, Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Peking Union Medical College Hospital (PUMCH) and Chinese Academy of Medical Sciences, Beijing, China
| | - Shiro Ikegawa
- Laboratory of Bone and Joint Diseases, RIKEN Center for Integrative Medical Sciences, Tokyo, Japan
| | - Nan Wu
- Department of Orthopaedic Surgery, Department of Medical Research Center, Key Laboratory of Big Data for Spinal Deformities, State Key Laboratory of Complex Severe and Rare Diseases, Beijing Key Laboratory for Genetic Research of Skeletal Deformity, Peking Union Medical College Hospital (PUMCH) and Chinese Academy of Medical Sciences, Beijing, China
| | - Carol A. Wise
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children (SRC), Dallas, Texas, USA
- Eugene McDermott Center for Human Growth and Development, Departments of Orthopaedic Surgery and Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Yong Hu
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
- Department of Orthopaedics and Traumatology, University of Hong Kong–Shenzhen Hospital, Shenzhen, China
| | - Keith Dip Kei Luk
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
| | - You-Qiang Song
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
- Department of Medicine, University of Hong Kong–Shenzhen Hospital, Shenzhen, China
- State Key Laboratory of Brain and Cognitive Sciences, University of Hong Kong, Pokfulam, Hong Kong, China
| | - Bo Gao
- School of Biomedical Sciences, Faculty of Medicine, Chinese University of Hong Kong, Shatin, Hong Kong, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, University of Hong Kong, Pokfulam, Hong Kong, China
- Department of Orthopaedics and Traumatology, University of Hong Kong–Shenzhen Hospital, Shenzhen, China
- Centre for Translational Stem Cell Biology, Tai Po, Hong Kong, China
- Key Laboratory of Regenerative Medicine, Ministry of Education, School of Biomedical Sciences, Faculty of Medicine, Chinese University of Hong Kong, Shatin, Hong Kong, China
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Bornstein B, Watkins B, Passini FS, Blecher R, Assaraf E, Sui XM, Brumfeld V, Tsoory M, Kröger S, Zelzer E. The mechanosensitive ion channel ASIC2 mediates both proprioceptive sensing and spinal alignment. Exp Physiol 2024; 109:135-147. [PMID: 36951012 PMCID: PMC10988735 DOI: 10.1113/ep090776] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 02/20/2023] [Indexed: 03/24/2023]
Abstract
By translating mechanical forces into molecular signals, proprioceptive neurons provide the CNS with information on muscle length and tension, which is necessary to control posture and movement. However, the identities of the molecular players that mediate proprioceptive sensing are largely unknown. Here, we confirm the expression of the mechanosensitive ion channel ASIC2 in proprioceptive sensory neurons. By combining in vivo proprioception-related functional tests with ex vivo electrophysiological analyses of muscle spindles, we showed that mice lacking Asic2 display impairments in muscle spindle responses to stretch and motor coordination tasks. Finally, analysis of skeletons of Asic2 loss-of-function mice revealed a specific effect on spinal alignment. Overall, we identify ASIC2 as a key component in proprioceptive sensing and a regulator of spine alignment.
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Affiliation(s)
- Bavat Bornstein
- Department of Molecular GeneticsWeizmann Institute of ScienceRehovotIsrael
| | - Bridgette Watkins
- Department of Physiological Genomics, Biomedical CenterLudwig‐Maximilians‐UniversityPlanegg‐MartinsriedGermany
| | - Fabian S. Passini
- Department of Molecular GeneticsWeizmann Institute of ScienceRehovotIsrael
| | - Ronen Blecher
- Orthopedic DepartmentAssuta Ashdod University Hospital, Ashdod, Israel, affiliated to Ben Gurion University of the NegevBeer ShebaIsrael
| | - Eran Assaraf
- Department of Orthopedic SurgeryShamir Medical Center, Assaf HaRofeh Campus, Zeffifin, Israel, affiliated to Sackler Faculty of Medicine, Tel Aviv UniversityTel AvivIsrael
| | - Xiao Meng Sui
- Department of Chemical Research SupportWeizmann Institute of ScienceRehovotIsrael
| | - Vlad Brumfeld
- Department of Chemical Research SupportWeizmann Institute of ScienceRehovotIsrael
| | - Michael Tsoory
- Department of Veterinary ResourcesWeizmann Institute of ScienceRehovotIsrael
| | - Stephan Kröger
- Department of Physiological Genomics, Biomedical CenterLudwig‐Maximilians‐UniversityPlanegg‐MartinsriedGermany
| | - Elazar Zelzer
- Department of Molecular GeneticsWeizmann Institute of ScienceRehovotIsrael
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9
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Xu H, Dugué GP, Cantaut-Belarif Y, Lejeune FX, Gupta S, Wyart C, Lehtinen MK. SCO-spondin knockout mice exhibit small brain ventricles and mild spine deformation. Fluids Barriers CNS 2023; 20:89. [PMID: 38049798 PMCID: PMC10696872 DOI: 10.1186/s12987-023-00491-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/18/2023] [Indexed: 12/06/2023] Open
Abstract
Reissner's fiber (RF) is an extracellular polymer comprising the large monomeric protein SCO-spondin (SSPO) secreted by the subcommissural organ (SCO) that extends through cerebrospinal fluid (CSF)-filled ventricles into the central canal of the spinal cord. In zebrafish, RF and CSF-contacting neurons (CSF-cNs) form an axial sensory system that detects spinal curvature, instructs morphogenesis of the body axis, and enables proper alignment of the spine. In mammalian models, RF has been implicated in CSF circulation. However, challenges in manipulating Sspo, an exceptionally large gene of 15,719 nucleotides, with traditional approaches has limited progress. Here, we generated a Sspo knockout mouse model using CRISPR/Cas9-mediated genome-editing. Sspo knockout mice lacked RF-positive material in the SCO and fibrillar condensates in the brain ventricles. Remarkably, Sspo knockout brain ventricle sizes were reduced compared to littermate controls. Minor defects in thoracic spine curvature were detected in Sspo knockouts, which did not alter basic motor behaviors tested. Altogether, our work in mouse demonstrates that SSPO and RF regulate ventricle size during development but only moderately impact spine geometry.
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Affiliation(s)
- Huixin Xu
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Guillaume P Dugué
- Neurophysiology of Brain Circuits, Institut de Biologie de l'Ecole Normale Supérieure (IBENS), Ecole Normale Supérieure, CNRS, INSERM, Université PSL, 75005, Paris, France
| | - Yasmine Cantaut-Belarif
- Sorbonne Université, Paris Brain Institute (Institut du Cerveau, ICM), Institut National de la Santé et de la Recherche Médicale (INSERM) U1127, Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche 7225, Assistance Publique-Hôpitaux de Paris (APHP), Campus Hospitalier Pitié-Salpêtrière, 47, bld Hospital, 75013, Paris, France
| | - François-Xavier Lejeune
- Sorbonne Université, Paris Brain Institute (Institut du Cerveau, ICM), Institut National de la Santé et de la Recherche Médicale (INSERM) U1127, Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche 7225, Assistance Publique-Hôpitaux de Paris (APHP), Campus Hospitalier Pitié-Salpêtrière, 47, bld Hospital, 75013, Paris, France
| | - Suhasini Gupta
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Claire Wyart
- Sorbonne Université, Paris Brain Institute (Institut du Cerveau, ICM), Institut National de la Santé et de la Recherche Médicale (INSERM) U1127, Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche 7225, Assistance Publique-Hôpitaux de Paris (APHP), Campus Hospitalier Pitié-Salpêtrière, 47, bld Hospital, 75013, Paris, France.
| | - Maria K Lehtinen
- Department of Pathology, Boston Children's Hospital and Harvard Medical School, Boston, MA, 02115, USA.
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10
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Lau KKL, Law KKP, Kwan KYH, Cheung JPY, Cheung KMC. Proprioception-related gene mutations in relation to the aetiopathogenesis of idiopathic scoliosis: A scoping review. J Orthop Res 2023; 41:2694-2702. [PMID: 37203456 DOI: 10.1002/jor.25626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/14/2023] [Accepted: 05/16/2023] [Indexed: 05/20/2023]
Abstract
Since idiopathic scoliosis is a multifactorial disorder, the proprioceptive defect is considered one of its etiological factors. Genetic studies have separately revealed this relationship, yet it remains indeterminate which specific genes that related to proprioception contributed to the initiation, progression, pathology, and treatment outcomes of the curvature. A systematic search was conducted on four online databases, including PubMed, Web of Science, Embase, and Academic search complete. Studies were included if they involved human or animal subjects with idiopathic scoliosis and evaluated with proprioceptive genes. The search period was the inception of the database to February 21, 2023. Four genes (i.e., Ladybird homeobox 1 [LBX1], Piezo type mechanosensitive ion channel component 2 [PIEZO2], Runx family transcription factor 3 [RUNX3], and neurotrophin 3 [NTF3]) investigated in 19 studies were included. LBX1 has confirmed the correlation with the development of idiopathic scoliosis in 10 ethnicities, whereas PIEZO2 has shown a connection with clinical proprioceptive tests in subjects with idiopathic scoliosis. However, curve severity was less likely to be related to the proprioceptive genes. The potential pathology took place at the proprioceptive neurons. Evidence of proprioception-related gene mutations in association with idiopathic scoliosis was established. Nevertheless, the causation between the initiation, progression, and treatment outcomes with proprioceptive defect requires further investigation.
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Affiliation(s)
- Kenney K L Lau
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
| | - Karlen K P Law
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
| | - Kenny Y H Kwan
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
| | - Jason P Y Cheung
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
- Department of Orthopaedics and Traumatology, The University of Hong Kong Shenzhen Hospital, Shenzhen, China
| | - Kenneth M C Cheung
- Department of Orthopaedics and Traumatology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong
- Department of Orthopaedics and Traumatology, The University of Hong Kong Shenzhen Hospital, Shenzhen, China
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11
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Nitzan DW. 'Adaptable condylectomy' for acquired facial asymmetry and malocclusion caused by temporomandibular joint condylar hyperplasia. Int J Oral Maxillofac Surg 2023; 52:1145-1155. [PMID: 37230928 DOI: 10.1016/j.ijom.2023.05.001] [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: 09/02/2022] [Revised: 04/27/2023] [Accepted: 05/02/2023] [Indexed: 05/27/2023]
Abstract
This article describes the 'adaptable condylectomy' and highlights two innovative treatment protocols for the variety of acquired facial asymmetry and associated malocclusion caused by condylar hyperplasia, as illustrated by the cases of seven patients presenting different manifestations of condylar hyperplasia. Protocol I (three cases) is applied for condylar hyperplasia with a normal occlusion and involves a high condylectomy, with the goal of guiding the mandible back to the original occlusion. Protocol II (four cases) is applied for condylar hyperplasia with diverse acquired malocclusions and involves condylectomy at a level adapted to the malocclusion, allowing the mandible to be guided back to the occlusion that pre-existed the active change caused by the condylar hyperplasia, or to a position as close to the midline as possible. Both protocols are followed by gradual self-correction of the acquired facial asymmetry. These protocols often obviate the need for further surgical intervention and, if further correction is needed, it is much simpler.
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Affiliation(s)
- D W Nitzan
- Department of Oral and Maxillofacial Surgery, Hadassah School of Dental Medicine, The Hebrew University, Jerusalem, Israel.
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12
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Ito T, Sakai Y, Kawai K, Yamazaki K, Sugiura H, Morita Y. Proprioceptive reliance on trunk muscles for maintaining postural stability decreases in older patients with sagittal imbalance. Gait Posture 2023; 105:1-5. [PMID: 37451033 DOI: 10.1016/j.gaitpost.2023.06.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 04/22/2023] [Accepted: 06/28/2023] [Indexed: 07/18/2023]
Abstract
BACKGROUND Control of postural adjustments requires tight regulation of the spinal alignments. Sagittal imbalance may cause balance impairment and proprioceptive decline in older adults. However, the evidence on the proprioceptive mechanisms is limited, although it is known that poor proprioceptive inputs may induce spinal deformities. Thus, this study aimed to measure proprioceptive control quantifiers in older adults with sagittal imbalance to clarify the characteristic postural adjustments during proprioceptive inputs. RESEARCH QUESTION What are the specific proprioceptive postural adjustments required to maintain balance in older adult patients with lumbar spondylosis? METHODS This was a cross-sectional, observational study. The participants were classified according to the sagittal vertical axis (SVA) lengths with 50 mm as the cut-off value. The pressure displacement center was determined in 36 patients without sagittal imbalance and 68 patients with sagittal imbalance during an upright stance on a balance board with eyes closed. Vibratory stimulations of 27-272 Hz were applied to the gastrocnemius (GS) and lumbar multifidus (LM) muscles to measure the relative contributions and center of pressures of different relative proprioceptive weighting ratios (RPWs) used on postural adjustments. RESULTS The RPWs of older adults with sagittal imbalance were higher than that in those without sagittal imbalance (56-100 Hz; p = 0.013). Logistic regression analysis showed that older patients with sagittal imbalance had a significant ankle proprioception control of advantage (odds ratio: 1.1, 95% confidence interval: 1.01-1.1, p = 0.012). SIGNIFICANCE In older patients with sagittal imbalance, the reliance on hip strategy during balance control (RPW 56-100 Hz) decreases. A quantitative assessment of postural stability during proprioceptive inputs is crucial to identify dependence on proprioception signals, including postural strategy, in older patients with sagittal imbalance. Interventions to improve proprioception can improve the postural stability and strategy of older patients with sagittal imbalance.
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Affiliation(s)
- Tadashi Ito
- Three-Dimensional Motion Analysis Laboratory, Aichi Prefectural Mikawa Aoitori Medical and Rehabilitation Center for Developmental Disabilities, Okazaki 444-0002, Japan; Department of Integrated Health Sciences, Graduate School of Medicine, Nagoya University, Nagoya 461-8673, Japan.
| | - Yoshihito Sakai
- Department of Orthopedic Surgery, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan
| | - Keitaro Kawai
- Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Kazunori Yamazaki
- Institutional Research Center, Aichi Mizuho College, Nagoya City, Aichi Prefecture 467-0867, Japan
| | - Hideshi Sugiura
- Department of Integrated Health Sciences, Graduate School of Medicine, Nagoya University, Nagoya 461-8673, Japan
| | - Yoshifumi Morita
- Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
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13
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Xu H, Dugué GP, Cantaut-Belarif Y, Lejeune FX, Gupta S, Wyart C, Lehtinen MK. SCO-spondin knockout mice exhibit small brain ventricles and mild spine deformation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.01.551512. [PMID: 37577601 PMCID: PMC10418289 DOI: 10.1101/2023.08.01.551512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Reissner's fiber (RF) is an extracellular polymer comprising the large monomeric protein SCO-spondin (SSPO) secreted by the subcommissural organ (SCO) that extends through cerebrospinal fluid (CSF)-filled ventricles into the central canal of the spinal cord. In zebrafish, RF and CSF-contacting neurons (CSF-cNs) form an axial sensory system that detects spinal curvature, instructs morphogenesis of the body axis, and enables proper alignment of the spine. In mammalian models, RF has been implicated in CSF circulation. However, challenges in manipulating Sspo , an exceptionally large gene of 15,719 nucleotides, with traditional approaches has limited progress. Here, we generated a Sspo knockout mouse model using CRISPR/Cas9-mediated genome-editing. Sspo knockout mice lacked RF-positive material in the SCO and fibrillar condensates in the brain ventricles. Remarkably, Sspo knockout brain ventricle sizes were reduced compared to littermate controls. Minor defects in thoracic spine curvature were detected in Sspo knockouts, which did not alter basic motor behaviors tested. Altogether, our work in mouse demonstrates that SSPO and RF regulate ventricle size during development but only moderately impact spine geometry.
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14
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Cuevas M, Terhune E, Wethey C, James M, Netsanet R, Grofova D, Monley A, Hadley Miller N. Cytoskeletal Keratins Are Overexpressed in a Zebrafish Model of Idiopathic Scoliosis. Genes (Basel) 2023; 14:genes14051058. [PMID: 37239418 DOI: 10.3390/genes14051058] [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: 02/13/2023] [Revised: 04/26/2023] [Accepted: 04/28/2023] [Indexed: 05/28/2023] Open
Abstract
Idiopathic scoliosis (IS) is a three-dimensional rotation of the spine >10 degrees with an unknown etiology. Our laboratory established a late-onset IS model in zebrafish (Danio rerio) containing a deletion in kif7. A total of 25% of kif7co63/co63 zebrafish develop spinal curvatures and are otherwise developmentally normal, although the molecular mechanisms underlying the scoliosis are unknown. To define transcripts associated with scoliosis in this model, we performed bulk mRNA sequencing on 6 weeks past fertilization (wpf) kif7co63/co63 zebrafish with and without scoliosis. Additionally, we sequenced kif7co63/co63, kif7co63/+, and AB zebrafish (n = 3 per genotype). Sequencing reads were aligned to the GRCz11 genome and FPKM values were calculated. Differences between groups were calculated for each transcript by the t-test. Principal component analysis showed that transcriptomes clustered by sample age and genotype. kif7 mRNA was mildly reduced in both homozygous and heterozygous zebrafish compared to AB. Sonic hedgehog target genes were upregulated in kif7co63/co63 zebrafish over AB, but no difference was detected between scoliotic and non-scoliotic mutants. The top upregulated genes in scoliotic zebrafish were cytoskeletal keratins. Pankeratin staining of 6 wpf scoliotic and non-scoliotic kif7co63/co63 zebrafish showed increased keratin levels within the zebrafish musculature and intervertebral disc (IVD). Keratins are major components of the embryonic notochord, and aberrant keratin expression has been associated with intervertebral disc degeneration (IVDD) in both zebrafish and humans. The role of increased keratin accumulation as a molecular mechanism associated with the onset of scoliosis warrants further study.
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Affiliation(s)
- Melissa Cuevas
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Elizabeth Terhune
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Cambria Wethey
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - MkpoutoAbasi James
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Rahwa Netsanet
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Denisa Grofova
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Anna Monley
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Musculoskeletal Research Center, Children's Hospital Colorado, Aurora, CO 80045, USA
| | - Nancy Hadley Miller
- Department of Orthopedics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
- Musculoskeletal Research Center, Children's Hospital Colorado, Aurora, CO 80045, USA
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15
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Seda M, Crespo B, Corcelli M, Osborn DP, Jenkins D. A CRISPR/Cas9-generated mutation in the zebrafish orthologue of PPP2R3B causes idiopathic scoliosis. Sci Rep 2023; 13:6783. [PMID: 37100808 PMCID: PMC10133272 DOI: 10.1038/s41598-023-33589-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 04/15/2023] [Indexed: 04/28/2023] Open
Abstract
Idiopathic scoliosis (IS) is the deformation and/or abnormal curvature of the spine that develops progressively after birth. It is a very common condition, affecting approximately 4% of the general population, yet the genetic and mechanistic causes of IS are poorly understood. Here, we focus on PPP2R3B, which encodes a protein phosphatase 2A regulatory subunit. We found that PPP2R3B is expressed at sites of chondrogenesis within human foetuses, including the vertebrae. We also demonstrated prominent expression in myotome and muscle fibres in human foetuses, and zebrafish embryos and adolescents. As there is no rodent orthologue of PPP2R3B, we used CRIPSR/Cas9-mediated gene-editing to generate a series of frameshift mutations in zebrafish ppp2r3b. Adolescent zebrafish that were homozygous for this mutation exhibited a fully penetrant kyphoscoliosis phenotype which became progressively worse over time, mirroring IS in humans. These defects were associated with reduced mineralisation of vertebrae, resembling osteoporosis. Electron microscopy demonstrated abnormal mitochondria adjacent to muscle fibres. In summary, we report a novel zebrafish model of IS and reduced bone mineral density. In future, it will be necessary to delineate the aetiology of these defects in relation to bone, muscle, neuronal and ependymal cilia function.
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Affiliation(s)
- Marian Seda
- Genetics and Genomic Medicine Programme, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Berta Crespo
- Developmental Biology and Cancer Programme, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Michelangelo Corcelli
- Genetics and Genomic Medicine Programme, UCL Institute of Child Health, London, WC1N 1EH, UK
| | - Daniel P Osborn
- Genetics Sections, Molecular and Clinical Sciences Institute, St George's University of London, Cranmer Terrace, London, SW17 0RE, UK
| | - Dagan Jenkins
- Genetics and Genomic Medicine Programme, UCL Institute of Child Health, London, WC1N 1EH, UK.
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16
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Shao X, Fu X, Yang J, Sui W, Li S, Yang W, Lin X, Zhang Y, Jia M, Liu H, Liu W, Han L, Yu Y, Deng Y, Zhang T, Yang J, Hu P. The asymmetrical ESR1 signaling in muscle progenitor cells determines the progression of adolescent idiopathic scoliosis. Cell Discov 2023; 9:44. [PMID: 37185898 PMCID: PMC10130095 DOI: 10.1038/s41421-023-00531-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 02/21/2023] [Indexed: 05/17/2023] Open
Abstract
Adolescent Idiopathic Scoliosis (AIS) is a common pediatric skeletal disease highly occurred in females. The pathogenesis of AIS has not been fully elucidated. Here, we reveal that ESR1 (Estrogen Receptor 1) expression declines in muscle stem/progenitor cells at the concave side of AIS patients. Furthermore, ESR1 is required for muscle stem/progenitor cell differentiation and disrupted ESR1 signaling leads to differentiation defects. The imbalance of ESR1 signaling in the para-spinal muscles induces scoliosis in mice, while reactivation of ESR1 signaling at the concave side by an FDA approved drug Raloxifene alleviates the curve progression. This work reveals that the asymmetric inactivation of ESR1 signaling is one of the causes of AIS. Reactivation of ESR1 signaling in para-spinal muscle by Raloxifene at the concave side could be a new strategy to treat AIS.
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Affiliation(s)
- Xiexiang Shao
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin Fu
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingfan Yang
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenyuan Sui
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Sheng Li
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenjun Yang
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xingzuan Lin
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuanyuan Zhang
- 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
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Minzhi Jia
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Huan Liu
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Wei Liu
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Lili Han
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Yang Yu
- Centre Testing International Medical Laboratory (CTI-Medlab), Shanghai, China
| | - Yaolong Deng
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Tianyuan Zhang
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junlin Yang
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Ping Hu
- Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
- Guangzhou Laboratory, Guangzhou International Bio Island, Guangzhou, Guangdong, China.
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China.
- Key Laboratory of Biological Targeting Diagnosis, Therapy and Rehabilitation of Guangdong Higher Education Institutes, The Fifth Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
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17
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Ushiki A, Sheng RR, Zhang Y, Zhao J, Nobuhara M, Murray E, Ruan X, Rios JJ, Wise CA, Ahituv N. Deletion of Pax1 scoliosis-associated regulatory elements leads to a female-biased tail abnormality. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.12.536497. [PMID: 37090618 PMCID: PMC10120660 DOI: 10.1101/2023.04.12.536497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
Adolescent idiopathic scoliosis (AIS), a sideways curvature of the spine, is sexually dimorphic, with increased incidence in females. A GWAS identified a female-specific AIS susceptibility locus near the PAX1 gene. Here, we used mouse enhancer assays, three mouse enhancer knockouts and subsequent phenotypic analyses to characterize this region. Using mouse enhancer assays, we characterized a sequence, PEC7, that overlaps the AIS-associated variant, and found it to be active in the tail tip and intervertebral disc. Removal of PEC7 or Xe1, a known sclerotome enhancer nearby, and deletion of both sequences led to a kinky phenotype only in the Xe1 and combined (Xe1+PEC7) knockouts, with only the latter showing a female sex dimorphic phenotype. Extensive phenotypic characterization of these mouse lines implicated several differentially expressed genes and estrogen signaling in the sex dimorphic bias. In summary, our work functionally characterizes an AIS-associated locus and dissects the mechanism for its sexual dimorphism.
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Affiliation(s)
- Aki Ushiki
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Rory R. Sheng
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Yichi Zhang
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China
| | - Jingjing Zhao
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Mai Nobuhara
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Elizabeth Murray
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Xin Ruan
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
| | - Jonathan J. Rios
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children, Dallas, TX 75219, USA
- Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Carol A. Wise
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children, Dallas, TX 75219, USA
- Department of Orthopaedic Surgery, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Eugene McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Nadav Ahituv
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158, USA
- Institute for Human Genetics, University of California San Francisco, San Francisco, CA 94158, USA
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18
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Alessandro C, Prashara A, Tentler DP, Tresch MC. Inhibition of knee joint sensory afferents alters covariation across strides between quadriceps muscles during locomotion. J Appl Physiol (1985) 2023; 134:957-968. [PMID: 36759157 PMCID: PMC10069963 DOI: 10.1152/japplphysiol.00591.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 01/03/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Sport-related injuries to articular structures often alter the sensory information conveyed by joint structures to the nervous system. However, the role of joint sensory afferents in motor control is still unclear. Here, we evaluate the role of knee joint sensory afferents in the control of quadriceps muscles, hypothesizing that such sensory information modulates control strategies that limit patellofemoreal joint loading. We compared locomotor kinematics and muscle activity before and after inhibition of knee sensory afferents by injection of lidocaine into the knee capsule of rats. We evaluated whether this inhibition reduced the strength of correlation between the activity of vastus medialis (VM) and vastus lateralis (VL) both across strides and within each stride, coordination patterns that limit net mediolateral patellofemoral forces. We also evaluated whether this inhibition altered correlations among the other quadriceps muscle activity, the time-profiles of individual EMG envelopes, or movement kinematics. Neither the EMG envelopes nor limb kinematics was affected by the inhibition of knee sensory afferents. This perturbation also did not affect the correlations between VM and VL, suggesting that the regulation of patellofemoral joint loading is mediated by different mechanisms. However, inhibition of knee sensory afferents caused a significant reduction in the correlation between vastus intermedius (VI) and both VM and VL across, but not within, strides. Knee joint sensory afferents may therefore modulate the coordination between the vasti muscles but only at coarse time scales. Injuries compromising joint afferents might result in altered muscle coordination, potentially leading to persistent internal joint stresses and strains.NEW & NOTEWORTHY Sensory afferents originating from knee joint receptors provide the nervous system with information about the internal state of the joint. In this study, we show that these sensory signals are used to modulate the covariations among the activity of a subset of vasti muscles across strides of locomotion. Sport-related injuries that damage joint receptors may therefore compromise these mechanisms of muscle coordination, potentially leading to persistent internal joint stresses and strains.
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Affiliation(s)
- Cristiano Alessandro
- Department of Neuroscience, Northwestern University, Chicago, Illinois, United States
- School of Medicine and Surgery/Sport and Exercise Medicine, University of Milano-Bicocca, Milan, Italy
| | - Adarsh Prashara
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States
| | - David P Tentler
- Department of Neuroscience, Northwestern University, Chicago, Illinois, United States
| | - Matthew C Tresch
- Department of Neuroscience, Northwestern University, Chicago, Illinois, United States
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States
- Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Illinois, United States
- Shirley Ryan AbilityLab, Chicago, Illinois, United States
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19
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Bornstein B, Heinemann-Yerushalmi L, Krief S, Adler R, Dassa B, Leshkowitz D, Kim M, Bewick G, Banks RW, Zelzer E. Molecular characterization of the intact mouse muscle spindle using a multi-omics approach. eLife 2023; 12:81843. [PMID: 36744866 PMCID: PMC9931388 DOI: 10.7554/elife.81843] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 02/03/2023] [Indexed: 02/07/2023] Open
Abstract
The proprioceptive system is essential for the control of coordinated movement, posture, and skeletal integrity. The sense of proprioception is produced in the brain using peripheral sensory input from receptors such as the muscle spindle, which detects changes in the length of skeletal muscles. Despite its importance, the molecular composition of the muscle spindle is largely unknown. In this study, we generated comprehensive transcriptomic and proteomic datasets of the entire muscle spindle isolated from the murine deep masseter muscle. We then associated differentially expressed genes with the various tissues composing the spindle using bioinformatic analysis. Immunostaining verified these predictions, thus establishing new markers for the different spindle tissues. Utilizing these markers, we identified the differentiation stages the spindle capsule cells undergo during development. Together, these findings provide comprehensive molecular characterization of the intact spindle as well as new tools to study its development and function in health and disease.
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Affiliation(s)
- Bavat Bornstein
- Department of Molecular Genetics, Weizmann Institute of ScienceRehovotIsrael
| | | | - Sharon Krief
- Department of Molecular Genetics, Weizmann Institute of ScienceRehovotIsrael
| | - Ruth Adler
- Department of Molecular Genetics, Weizmann Institute of ScienceRehovotIsrael
| | - Bareket Dassa
- Bioinformatics Unit, Department of Life Sciences Core Facilities, Weizmann Institute of ScienceRehovotIsrael
| | - Dena Leshkowitz
- Bioinformatics Unit, Department of Life Sciences Core Facilities, Weizmann Institute of ScienceRehovotIsrael
| | - Minchul Kim
- Developmental Biology/Signal Transduction, Max Delbrueck Center for Molecular MedicineBerlinGermany,Team of syncytial cell biology, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC)IllkirchFrance
| | - Guy Bewick
- Institute of Medical Sciences, University of AberdeenAberdeenUnited Kingdom
| | - Robert W Banks
- Department of Biosciences, Durham UniversityDurhamUnited Kingdom
| | - Elazar Zelzer
- Department of Molecular Genetics, Weizmann Institute of ScienceRehovotIsrael
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20
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Texture recognition based on multi-sensory integration of proprioceptive and tactile signals. Sci Rep 2022; 12:21690. [PMID: 36522364 PMCID: PMC9755227 DOI: 10.1038/s41598-022-24640-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 11/17/2022] [Indexed: 12/23/2022] Open
Abstract
The sense of touch plays a fundamental role in enabling us to interact with our surrounding environment. Indeed, the presence of tactile feedback in prostheses greatly assists amputees in doing daily tasks. In this line, the present study proposes an integration of artificial tactile and proprioception receptors for texture discrimination under varying scanning speeds. Here, we fabricated a soft biomimetic fingertip including an 8 × 8 array tactile sensor and a piezoelectric sensor to mimic Merkel, Meissner, and Pacinian mechanoreceptors in glabrous skin, respectively. A hydro-elastomer sensor was fabricated as an artificial proprioception sensor (muscle spindles) to assess the instantaneous speed of the biomimetic fingertip. In this study, we investigated the concept of the complex receptive field of RA-I and SA-I afferents for naturalistic textures. Next, to evaluate the synergy between the mechanoreceptors and muscle spindle afferents, ten naturalistic textures were manipulated by a soft biomimetic fingertip at six different speeds. The sensors' outputs were converted into neuromorphic spike trains to mimic the firing pattern of biological mechanoreceptors. These spike responses are then analyzed using machine learning classifiers and neural coding paradigms to explore the multi-sensory integration in real experiments. This synergy between muscle spindle and mechanoreceptors in the proposed neuromorphic system represents a generalized texture discrimination scheme and interestingly irrespective of the scanning speed.
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21
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Current models to understand the onset and progression of scoliotic deformities in adolescent idiopathic scoliosis: a systematic review. Spine Deform 2022; 11:545-558. [PMID: 36454530 DOI: 10.1007/s43390-022-00618-1] [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: 06/20/2022] [Accepted: 11/12/2022] [Indexed: 12/05/2022]
Abstract
PURPOSE To create an updated and comprehensive overview of the modeling studies that have been done to understand the mechanics underlying deformities of adolescent idiopathic scoliosis (AIS), to predict the risk of curve progression and thereby substantiate etiopathogenetic theories. METHODS In this systematic review, an online search in Scopus and PubMed together with an analysis in secondary references was done, which yielded 86 studies. The modeling types were extracted and the studies were categorized accordingly. RESULTS Animal modeling, together with machine learning modeling, forms the category of black box models. This category is perceived as the most clinically relevant. While animal models provide a tangible idea of the biomechanical effects in scoliotic deformities, machine learning modeling was found to be the best curve-progression predictor. The second category, that of artificial models, has, just as animal modeling, a tangible model as a result, but focusses more on the biomechanical process of the scoliotic deformity. The third category is formed by computational models, which are very popular in etiopathogenetic parameter-based studies. They are also the best in calculating stresses and strains on vertebrae, intervertebral discs, and other surrounding tissues. CONCLUSION This study presents a comprehensive overview of the current modeling techniques to understand the mechanics of the scoliotic deformities, predict the risk of curve progression in AIS and thereby substantiate etiopathogenetic theories. Although AIS remains to be seen as a complex and multifactorial problem, the progression of its deformity can be predicted with good accuracy. Modeling of AIS develops rapidly and may lead to the identification of risk factors and mitigation strategies in the near future. The overview presented provides a basis to follow this development.
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22
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Lau KKL, Kwan KYH, Cheung JPY, Chow W, Law KKP, Wong AYL, Chow DHK, Cheung KMC. Reliability of a three-dimensional spinal proprioception assessment for patients with adolescent idiopathic scoliosis. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2022; 31:3013-3019. [PMID: 35922635 DOI: 10.1007/s00586-022-07338-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 03/18/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
PURPOSE Although it is evident that some patients with adolescent idiopathic scoliosis (AIS) have proprioceptive deficit in peripheral joints, knowledge on the proprioceptive function of the deformed spine is limited. Nonetheless, spinal proprioception in AIS may be affected three-dimensionally, prior studies only focussed on evaluating peripheral proprioception in single plane. Therefore, this study aimed to develop a novel spinal proprioception assessment using three-dimensional motion analysis in patients with AIS. METHODS Participants were included if they had a primary diagnosis of AIS who did not receive or failed conservative treatments. Three trunk repositioning tests involving flexion-extension, lateral-flexion, and axial-rotation were conducted. A three-dimensional kinematics of the trunk was used as the outcome measures. The proprioceptive acuity was quantified by the repositioning error. The intra-examiner and test-retest reliability were analysed by the intraclass correlation coefficient (ICC). RESULTS Fifty-nine patients with AIS were recruited. Regarding the trunk flexion-extension test, the single measure ICC showed moderate reliability (0.46) and the average measures ICC demonstrated good reliability (0.72). As for the trunk lateral-flexion test, the reliability of single measure and average measures ICC was moderate (0.44) and good (0.70) reliability, respectively. For the trunk axial-rotation test, the single measure ICC indicated fair reliability (0.32), while the average measures ICC showed moderate reliability (0.59). CONCLUSION This is the first study to evaluate the reliability of novel three-dimensional spinal proprioception assessments in patients with AIS. The trunk flexion-extension repositioning test may be preferable clinical test given its highest reliability.
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Affiliation(s)
- Kenney Ki-Lee Lau
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Kenny Yat-Hong Kwan
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Jason Pui-Yin Cheung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Wang Chow
- Department of Orthopaedics and Traumatology, The Duchess of Kent Children's Hospital, Pokfulam, Hong Kong
| | - Karlen Ka-Pui Law
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Arnold Yu-Lok Wong
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Daniel Hung-Kay Chow
- Department of Health and Physical Education, The Education University of Hong Kong, Tai Po, Hong Kong
| | - Kenneth Man-Chee Cheung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Pokfulam, Hong Kong.
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23
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Proprioceptive Cervicogenic Dizziness: A Narrative Review of Pathogenesis, Diagnosis, and Treatment. J Clin Med 2022; 11:jcm11216293. [DOI: 10.3390/jcm11216293] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/19/2022] [Accepted: 10/24/2022] [Indexed: 01/17/2023] Open
Abstract
Basic science and clinical evidence suggest that cervical spine disorders can lead to dizziness. The cervical spine has highly developed proprioceptive receptors, whose input information is integrated with the visual and vestibular systems in the central nervous system, acting on the neck and eye muscles to maintain the coordinative motion of the head, eyes, neck, and body through various reflex activities. When the cervical proprioceptive input changes due to the mismatch or conflict between vestibular, visual, and proprioceptive inputs, cervicogenic dizziness may occur. The diagnosis of cervicogenic dizziness can be determined based on clinical features, diagnostic tests, and the exclusion of other possible sources of dizziness. The cervical torsion test appears to be the best diagnostic method for cervicogenic dizziness. Based on the available evidence, we first developed the diagnostic criteria for cervicogenic dizziness. Treatment for cervicogenic dizziness is similar to that for neck pain, and manual therapy is most widely recommended.
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Lau KKL, Law KKP, Kwan KYH, Cheung JPY, Cheung KMC, Wong AYL. Timely Revisit of Proprioceptive Deficits in Adolescent Idiopathic Scoliosis: A Systematic Review and Meta-Analysis. Global Spine J 2022; 12:1852-1861. [PMID: 34911378 PMCID: PMC9609540 DOI: 10.1177/21925682211066824] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
STUDY DESIGN Systematic review and meta-analysis. OBJECTIVES The present review aimed to summarize the evidence regarding differences in proprioception between children with and without adolescent idiopathic scoliosis (AIS). METHODS Seven electronic databases were searched from their inception to April 10, 2021. Articles were included if they involved: (1) AIS patients aged between 10 and 18 years, (2) measurements of proprioceptive abilities, and (3) comparisons with non-AIS controls. Animal studies, case reports, commentaries, conference proceedings, research protocols, and reviews were excluded. Two reviewers independently conducted literature screening, data extraction, risks of bias assessments, and quality of evidence evaluations. Relevant information was pooled for meta-analyses. RESULTS From 432 identified citations, 11 case-control studies comprising 1121 participants were included. The meta-analyses showed that AIS participants displayed proprioceptive deficits as compared to non-AIS controls. Moderate evidence supported that AIS participants showed significantly larger repositioning errors than healthy controls (pooled mean difference = 1.27 degrees, P < .01). Low evidence substantiated that AIS participants had significantly greater motion detection threshold (pooled mean difference = 1.60 degrees, P < .01) and abnormal somatosensory evoked potentials (pooled mean difference = .36 milliseconds, P = .01) than non-AIS counterparts. CONCLUSIONS Consistent findings revealed that proprioceptive deficits occurred in AIS patients. Further investigations on the causal relationship between AIS and proprioception, and the identification of the subgroup of AIS patients with proprioceptive deficit are needed.
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Affiliation(s)
- Kenney K. L. Lau
- Department of Orthopaedics and
Traumatology, The University of Hong
Kong, Hong Kong
| | - Karlen K. P. Law
- Department of Orthopaedics and
Traumatology, The University of Hong
Kong, Hong Kong
| | - Kenny Y. H. Kwan
- Department of Orthopaedics and
Traumatology, The University of Hong
Kong, Hong Kong
| | - Jason P. Y. Cheung
- Department of Orthopaedics and
Traumatology, The University of Hong
Kong, Hong Kong
| | - Kenneth M. C. Cheung
- Department of Orthopaedics and
Traumatology, The University of Hong
Kong, Hong Kong,Kenneth M. C. Cheung, Department of
Orthopaedics and Traumatology, The University of Hong Kong, Queen Mary Hospital,
Pokfulam Road, Hong Kong.
| | - Arnold Y. L. Wong
- Department of Rehabilitation
Sciences, The Hong Kong Polytechnic
University, Hong Kong,Arnold Y. L. Wong, Department of
Rehabilitation Sciences, The Hong Kong Polytechnic University, Yuk Choi Road,
Hong Kong.
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25
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Klinge PM, McElroy A, Leary OP, Donahue JE, Mumford A, Brinker T, Gokaslan ZL. Not Just an Anchor: The Human Filum Terminale Contains Stretch Sensitive and Nociceptive Nerve Endings and Responds to Electrical Stimulation With Paraspinal Muscle Activation. Neurosurgery 2022; 91:618-624. [PMID: 35852974 PMCID: PMC9447435 DOI: 10.1227/neu.0000000000002081] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 05/23/2022] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Neural components of the fibrous filum terminale (FT) are well known but are considered as embryonic remnants without functionality. OBJECTIVE To investigate the ultrastructure of human FT specimens for sensory nerve endings and record paraspinal muscle activity on electrostimulation of the FT. METHODS We prospectively investigated a cohort of 53 patients who underwent excision of the FT for the treatment of tethered cord syndrome. Surgical FT specimens were investigated by light and transmission electron microscopy. Intraoperative electrophysiological routine monitoring was extended by recording paraspinal muscles above and below the laminotomy level. RESULTS Light microscopy revealed tiny peripheral nerves piercing the pia mater of the FT and entering its fibrous core. Transmission electron microscopy unveiled within the fibrous core of the FT myelinated nerve structures in 8 of the 53 patients and unmyelinated ones in 10 of the 53 patients. Both nerve endings encapsulated in fibrous tissue or unencapsulated nonmyelinated Schwann cell nerve bundles, that is, Remak cells, were found. Those nerve endings resembled mechanoreceptor and nociceptive receptor structures found in human skin, muscle tendons, and skeletal ligaments. Specifically, we found Ruffini mechanoreceptors and in addition nerve endings which resembled nociceptive glioneural structures of the skin. Bipolar electrostimulation of the FT was associated with paraspinal muscle activity above and below the spinal segment at which the FT was stimulated. CONCLUSION Morphological and electrophysiological results indicate the presence of functional sensory nerve endings in the FT. Like other spine ligaments, the FT may serve as a proprioceptive element but may also contribute to back pain in spine disorders.
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Affiliation(s)
- Petra M. Klinge
- Department of Neurosurgery, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Abigail McElroy
- Department of Neurosurgery, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Owen P. Leary
- Department of Neurosurgery, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - John E. Donahue
- Department of Pathology, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Andrew Mumford
- Department of Neurosurgery, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Thomas Brinker
- Department of Neurosurgery, Medical School Hannover, Hannover, Germany
| | - Ziya L. Gokaslan
- Department of Neurosurgery, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
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Akyurek E, Zengin Alpozgen A, Akgul T. The preliminary results of physiotherapy scoliosis-specific exercises on spine joint position sense in adolescent idiopathic scoliosis: A randomized controlled trial. Prosthet Orthot Int 2022; 46:510-517. [PMID: 36215059 DOI: 10.1097/pxr.0000000000000136] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 03/14/2022] [Indexed: 02/03/2023]
Abstract
BACKGROUND It has been observed that there are difficulties in maintaining spinal harmony in the absence of proprioceptive information, which has an important role in achieving postural control in scoliosis. One of the tests used to evaluate proprioceptive mechanisms is joint position reproduction. OBJECTIVES The main aim of our study was to investigate the effect of physiotherapy scoliosis-specific exercise (PSSE) on spine joint reposition (JR) sense. The second aim was to determine the effects of PSSE on the angle of trunk rotation (ATR), posture, and deformity perception in adolescent idiopathic scoliosis. METHODS Twenty-nine patients with adolescent idiopathic scoliosis (mean age 13.79 ± 1.82 years) were randomly allocated to two groups. "Schroth" exercises were applied to the PSSE group for 8 weeks (16 sessions). The control group was placed on the waiting list. Patients' JR error (dual inclinometer), ATR (scoliometer), posture parameters (PostureScreen Mobile, Posterior Trunk Asymmetry Index, and Anterior Trunk Asymmetry Index), and deformity perception (Walter Reed Visual Assessment Scale [WRVAS]) were assessed at the first session and at the end of 8 weeks. RESULTS The initial demographic characteristics, Cobb (thoracal: 19.41 ± 7.03 degrees; lumbar: 20.76 ± 7.24 degrees) and ATR (thoracal: 5.86 ± 3.98 degrees; lumbar: 5.66 ± 3.33 degrees) and clinical test parameters of the groups (JR, posture parameters, and WRVAS) were similar (P > .05). According to the findings, thoracal and lumbar JR error values (P < .05), ATR (P ≤ .001), posture parameters (P ≤ .001), and WRVAS (P = .048) were significantly improved in the PSSE group. Besides, when the groups were compared, a significant difference was found in favor of PSSE except for the deformity perception (P < .05). CONCLUSIONS Schroth exercises have a positive contribution for improving JR sense of the spine, vertebral rotation, and posture.
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Affiliation(s)
- Elcin Akyurek
- Department of Physiotherapy and Rehabilitation, Istanbul University-Cerrahpasa, Institute of Graduate Studies, Istanbul, Turkey
| | - Ayse Zengin Alpozgen
- Faculty of Health Sciences, Department of Physiotherapy and Rehabilitation, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Turgut Akgul
- Istanbul Faculty of Medicine, Department of Orthopedics and Traumatology, Istanbul University, Istanbul, Turkey
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Marya S, Tambe AD, Millner PA, Tsirikos AI. Adolescent idiopathic scoliosis : a review of aetiological theories of a multifactorial disease. Bone Joint J 2022; 104-B:915-921. [PMID: 35909373 DOI: 10.1302/0301-620x.104b8.bjj-2021-1638.r1] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Adolescent idiopathic scoliosis (AIS), defined by an age at presentation of 11 to 18 years, has a prevalence of 0.47% and accounts for approximately 90% of all cases of idiopathic scoliosis. Despite decades of research, the exact aetiology of AIS remains unknown. It is becoming evident that it is the result of a complex interplay of genetic, internal, and environmental factors. It has been hypothesized that genetic variants act as the initial trigger that allow epigenetic factors to propagate AIS, which could also explain the wide phenotypic variation in the presentation of the disorder. A better understanding of the underlying aetiological mechanisms could help to establish the diagnosis earlier and allow a more accurate prediction of deformity progression. This, in turn, would prompt imaging and therapeutic intervention at the appropriate time, thereby achieving the best clinical outcome for this group of patients. Cite this article: Bone Joint J 2022;104-B(8):915-921.
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Affiliation(s)
- Shivan Marya
- Royal Manchester Children's Hospital, Manchester, UK
| | | | | | - Athanasios I Tsirikos
- Scottish National Spine Deformity Centre, Royal Hospital for Children and Young People, Edinburgh, UK
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28
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Wang W, Chen T, Liu Y, Wang S, Yang N, Luo M. Predictive value of single-nucleotide polymorphisms in curve progression of adolescent idiopathic scoliosis. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2022; 31:2311-2325. [PMID: 35434775 DOI: 10.1007/s00586-022-07213-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/24/2022] [Accepted: 04/06/2022] [Indexed: 12/18/2022]
Abstract
PURPOSE Genetic diagnosis is a promising approach because several single-nucleotide polymorphisms (SNPs) associated with adolescent idiopathic scoliosis (AIS) progression have been reported. We review the predictive value of SNPs in curve progression of adolescent idiopathic scoliosis. METHODS We reviewed DNA-based prognostic testing to predict curve progression. Then, the multiple polymorphisms in loci related to AIS progression were also reviewed, and we elucidated the predictive value of SNPs from four functional perspectives, including endocrine metabolism, neuromuscular system, cartilage and extracellular matrix, enzymes, and cytokines. RESULTS The ScoliScores were less successful predictors than expected, and the weak power of predictive SNPs might account for its failure. Susceptibility loci in ESR1, ESR2, GPER, and IGF1, which related to endocrine metabolism, have been reported to predict AIS progression. Neuromuscular imbalance might be a potential mechanism of scoliosis, and SNPs in LBX1, NTF3, and SOCS3 have been reported to predict the curve progression of AIS. Susceptibility loci in SOX9, MATN1, AJAP1, MMP9, and TIMP2, which are related to cartilage and extracellular matrix, are also potentially related to AIS progression. Enzymes and cytokines play essential roles in regulating bone metabolism and embryonic development. SNPs in BNC2, SLC39A8, TGFB1, IL-6, IL-17RC, and CHD7 were suggested as predictive loci for AIS curve progression. CONCLUSIONS Many promising SNPs have been identified to predict the curve progression of AIS. However, conflicting results from replication studies and different ethnic groups hamper their reliability. Convincing SNPs from multiethnic populations and functional verification are needed.
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Affiliation(s)
- Wengang Wang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China
| | - Tailong Chen
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China
| | - Yibin Liu
- Department of Emergency, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China
| | - Songsong Wang
- Department of Emergency, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China
| | - Ningning Yang
- Department of Orthopedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China. .,Department of Emergency, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, People's Republic of China.
| | - Ming Luo
- Department of Orthopedics, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei, People's Republic of China.
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29
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Simoneau M, Pialasse JP, Mercier P, Blouin JS. Adolescents with idiopathic scoliosis show decreased intermuscular coherence in lumbar paraspinal muscles: a new pathophysiological perspective. Clin Neurophysiol 2022; 138:38-51. [DOI: 10.1016/j.clinph.2022.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 02/18/2022] [Accepted: 03/02/2022] [Indexed: 11/03/2022]
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30
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Catanzariti JF, Coget M, Brouillard A. A perception bias of the gravitational vertical is confirmed in Adolescent Idiopathic Scoliosis. Spine Deform 2022; 10:69-78. [PMID: 34319559 DOI: 10.1007/s43390-021-00390-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 07/15/2021] [Indexed: 12/24/2022]
Abstract
PURPOSE Adolescent Idiopathic Scoliosis (AIS) is the most frequent spine deformity in adolescence. The cause of AIS remains unknown. Several studies show that AIS can be associated with a perception bias of gravitational vertical. In particularly, AIS patients with a right thoracic convexity exhibit deviation of the Subjective Postural Vertical. The origin of this disturbance could be located in trunk proprioceptive graciveptors. We wanted to verify this result with a population of lumbar and thoracolumbar AIS with left convexity. METHODS It was a multicenter, cross-sectional case-control study. Thirty adolescents with left lumbar or thoraco-lumbar AIS (age 14.3 ± 1.7 years; Cobb angle 27.6° ± 6.1°) and 30 controls matched for age (14.0 ± 1.5 years), were compared for Subjective Visual Vertical (SVV) measured in static and dynamic (optokinetic stimulation) conditions, and Subjective Postural Vertical (SPV). RESULTS For SVV, there was no difference in the two groups, for static and dynamic conditions. The SPV was significantly different between the two groups (p < 0.0001). The SPV was shifted to the left for most of the AIS patients (med - 2.4°[- 3.6; - 1.7]) compared with controls (med 0°[- 0.5; 1.7]). Adolescents with AIS perceived verticality with significant greater uncertainty in postural modality than controls (p = 0.017). CONCLUSION Our study confirms a significant directional bias in the orientation of SPV in left lumbar or thoraco-lumbar AIS. This confirmation paves the way to a new physiopathological model focused on trunk proprioception. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Jean-François Catanzariti
- Spine Department, SSR Pediatric Center Marc Sautelet, Villeneuve-d'Ascq, France. .,La Maison de la Scoliose, Villeneuve-d'Ascq, France.
| | - Monique Coget
- Spine Department, SSR Pediatric Center Marc Sautelet, Villeneuve-d'Ascq, France
| | - Anthony Brouillard
- Spine Department, SSR Pediatric Center Marc Sautelet, Villeneuve-d'Ascq, France.,La Maison de la Scoliose, Villeneuve-d'Ascq, France
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31
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Age-Related Alterations of Hyaluronan and Collagen in Extracellular Matrix of the Muscle Spindles. J Clin Med 2021; 11:jcm11010086. [PMID: 35011824 PMCID: PMC8745670 DOI: 10.3390/jcm11010086] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 12/17/2022] Open
Abstract
Background: Muscle spindles (MSs) play a crucial role in proprioception and locomotor coordination. Although the elasticity and viscosity of the extracellular matrix (ECM) within which MSs are embedded may play a key role in MS function, the impact of aging on ECM components is unclear. The aim of the current study was to investigate the age-related physiological changes of the ECM and to verify if these could be due to alterations of the environment directly surrounding MSs. Methods: Hematoxylin Eosin and picrosirius-red staining was carried out; collagen types I (COLI) and III (COLIII) were assessed, and biotinylated hyaluronan binding protein (HABP) immunohistochemical analysis was undertaken to evaluate alterations of the ECM in the intramuscular connective tissue (IMCT) of the hindlimbs of C57BL/6J male mice. Assessments were carried out on 6-week-old (Group A), 8-month-old (Group B), and 2-year-old (Group C) laboratory mice. Results: The capsule’s outer layer became progressively thicker with aging (it was 3.02 ± 0.26 μm in Group A, 3.64 ± 0.31 μm in Group B, and 5.81 ± 0.85 μm in Group C). The collagen in IMCT around and within the MSs was significantly higher in Group C, but there were no significant differences between Groups A and B. The MS capsules and continuous IMCT were primarily made up of COLI and COLIII. The average optical density (AOD) values of COLI in IMCT surrounding MS were significantly higher after aging (p < 0.05), but there were no significant differences in COLIII in the three groups (p > 0.05). HA was present in IMCT and filled the MSs capsule. The AOD of HABP of MS showed that there were lower HA levels in Group C with respect to Group A (p = 0.022); no significant differences were noted neither between Groups A and B nor between Groups B and C (p > 0.05). Conclusion: Age-related collagen accumulation and lower HA in the ECM in which the MSs were embedded may probably cause more stiffness in the ECM in vivo, which could help to partly explain the peripheral mechanisms underlying the age-related decline in functional changes related to MSs.
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32
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Decourtye L, McCallum-Loudeac JA, Zellhuber-McMillan S, Young E, Sircombe KJ, Wilson MJ. Characterization of a novel Lbx1 mouse loss of function strain. Differentiation 2021; 123:30-41. [PMID: 34906895 DOI: 10.1016/j.diff.2021.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 12/01/2021] [Accepted: 12/06/2021] [Indexed: 12/13/2022]
Abstract
Adolescent Idiopathic Scoliosis (AIS) is the most common type of spine deformity affecting 2-3% of the population worldwide. The etiology of this disease is still poorly understood. Several GWAS studies have identified single nucleotide polymorphisms (SNPs) located near the gene LBX1 that is significantly correlated with AIS risk. LBX1 is a transcription factor with roles in myocyte precursor migration, cardiac neural crest specification, and neuronal fate determination in the neural tube. Here, we further investigated the role of LBX1 in the developing spinal cord of mouse embryos using a CRISPR-generated mouse model expressing a truncated version of LBX1 (Lbx1Δ). Homozygous mice died at birth, likely due to cardiac abnormalities. To further study the neural tube phenotype, we used RNA-sequencing to identify 410 genes differentially expressed between the neural tubes of E12.5 wildtype and Lbx1Δ/Δ embryos. Genes with increased expression in the deletion line were involved in neurogenesis and those with broad roles in embryonic development. Many of these genes have also been associated with scoliotic phenotypes. In comparison, genes with decreased expression were primarily involved in skeletal development. Subsequent skeletal and immunohistochemistry analysis further confirmed these results. This study aids in understanding the significance of links between LBX1 function and AIS susceptibility.
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Affiliation(s)
- Lyvianne Decourtye
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand
| | - Jeremy A McCallum-Loudeac
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand
| | - Sylvia Zellhuber-McMillan
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand
| | - Emma Young
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand
| | - Kathleen J Sircombe
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand
| | - Megan J Wilson
- Department of Anatomy, School of Biomedical Sciences, University of Otago, 9054, Dunedin, New Zealand.
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Lv X, Xu J, Jiang J, Wu P, Tan R, Wang B. Genetic animal models of scoliosis: A systematical review. Bone 2021; 152:116075. [PMID: 34174503 DOI: 10.1016/j.bone.2021.116075] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 02/07/2023]
Abstract
Scoliosis is a complex disease with undetermined pathogenesis and has a strong relationship with genetics. Models of scoliosis in animals have been established for better comprehending its pathogenesis and treatment. In this review, we searched all the genetic animal models with body curvature in databases, and reviewed the related genes and scoliosis types. Meanwhile, we also summarized the pathogenesis of scoliosis reported so far. Summarizing the positive phenotypic animal models contributes to a better understanding on the pathogenesis of scoliosis and facilitates the selection of experimental models when a possible pathogenic factor is concerned.
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Affiliation(s)
- Xin Lv
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Jinghong Xu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Jiajiong Jiang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Pengfei Wu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Renchun Tan
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China
| | - Bing Wang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha 410011, Hunan, China.
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Shahidi B, Yoo A, Farnsworth C, Newton PO, Ward SR. Paraspinal muscle morphology and composition in adolescent idiopathic scoliosis: A histological analysis. JOR Spine 2021; 4:e1169. [PMID: 34611591 PMCID: PMC8479518 DOI: 10.1002/jsp2.1169] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 08/02/2021] [Accepted: 08/21/2021] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND Adolescent idiopathic scoliosis (AIS) is a condition resulting in spinal deformity and tissue adaptation of the paraspinal muscles. Although prior studies have demonstrated asymmetries in fiber type and other energetic features of muscle on the concave side of the curve, muscle morphology, architecture, and composition have not been evaluated. Therefore, the purpose of this study was to compare differences in paraspinal muscle microarchitecture and composition between concave and convex sides of a scoliotic curve in individuals with AIS. METHODS Paraspinal muscle biopsies were obtained at the apex of the scoliotic curve in 29 individuals with AIS undergoing surgical deformity correction. Histological assays were performed to quantify fiber size, evidence of muscle degeneration and regeneration, and tissue composition (proportion of muscle, collagen, and fat). Differences between contralateral muscle samples were compared using two-tailed paired Student's t tests, and relationships between clinical characteristics (age and curve severity) and muscle characteristics were investigated using Pearson correlations. RESULTS Muscle fibers were significantly larger on the convex side of the curve apex (P = .001), but were lower than literature-based norms for healthy paraspinal muscle. There were no differences in amount of degeneration/regeneration (P = .490) or the proportion of muscle and collagen (P > .350) between the concave and convex sides, but high levels of collagen were observed. There was a trend toward higher fat content on the concave side (P = .074). Larger fiber size asymmetries were associated with greater age (r = .43, P = .046), and trended toward an association with greater curve severity (r = .40, P = .069). CONCLUSIONS This study demonstrates that although muscle fibers are larger on the convex side of the scoliotic curve in AIS, muscles on both sides are atrophic compared to non-scoliotic individuals, and demonstrate levels of collagen similar to severe degenerative spinal pathologies. These findings provide insight into biological maladaptations occurring in paraspinal muscle in the presence of AIS.
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Affiliation(s)
- Bahar Shahidi
- Department of Orthopaedic SurgeryUniversity of California San DiegoLa JollaCaliforniaUSA
| | - Andrew Yoo
- Department of Orthopaedic SurgeryUniversity of California San DiegoLa JollaCaliforniaUSA
| | | | - Peter O. Newton
- Department of Orthopaedic SurgeryUniversity of California San DiegoLa JollaCaliforniaUSA
- Rady Children's HospitalSan DiegoCaliforniaUSA
| | - Samuel R. Ward
- Department of Orthopaedic SurgeryUniversity of California San DiegoLa JollaCaliforniaUSA
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Liang ZT, Guo CF, Li J, Zhang HQ. The role of endocrine hormones in the pathogenesis of adolescent idiopathic scoliosis. FASEB J 2021; 35:e21839. [PMID: 34387890 DOI: 10.1096/fj.202100759r] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 07/21/2021] [Accepted: 07/21/2021] [Indexed: 11/11/2022]
Abstract
Adolescent idiopathic scoliosis (AIS) is a common spinal deformity characterized by changes in the three-dimensional structure of the spine. It usually initiates during puberty, the peak period of human growth when the secretion of numerous hormones is changing, and it is more common in females than in males. Accumulating evidence shows that the abnormal levels of many hormones including estrogen, melatonin, growth hormone, leptin, adiponectin and ghrelin, may be related to the occurrence and development of AIS. The purpose of this review is to provide a summary and critique of the research published on each hormone over the past 20 years, and to highlight areas for future study. It is hoped that the presentation will help provide a better understanding of the role of endocrine hormones in the pathogenesis of AIS.
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Affiliation(s)
- Zhuo-Tao Liang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Chao-Feng Guo
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Jiong Li
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Hong-Qi Zhang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
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The contemporary model of vertebral column joint dysfunction and impact of high-velocity, low-amplitude controlled vertebral thrusts on neuromuscular function. Eur J Appl Physiol 2021; 121:2675-2720. [PMID: 34164712 PMCID: PMC8416873 DOI: 10.1007/s00421-021-04727-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 05/20/2021] [Indexed: 02/08/2023]
Abstract
Purpose There is growing evidence that vertebral column function and dysfunction play a vital role in neuromuscular control. This invited review summarises the evidence about how vertebral column dysfunction, known as a central segmental motor control (CSMC) problem, alters neuromuscular function and how spinal adjustments (high-velocity, low-amplitude or HVLA thrusts directed at a CSMC problem) and spinal manipulation (HVLA thrusts directed at segments of the vertebral column that may not have clinical indicators of a CSMC problem) alters neuromuscular function.
Methods The current review elucidates the peripheral mechanisms by which CSMC problems, the spinal adjustment or spinal manipulation alter the afferent input from the paravertebral tissues. It summarises the contemporary model that provides a biologically plausible explanation for CSMC problems, the manipulable spinal lesion. This review also summarises the contemporary, biologically plausible understanding about how spinal adjustments enable more efficient production of muscular force. The evidence showing how spinal dysfunction, spinal manipulation and spinal adjustments alter central multimodal integration and motor control centres will be covered in a second invited review. Results Many studies have shown spinal adjustments increase voluntary force and prevent fatigue, which mainly occurs due to altered supraspinal excitability and multimodal integration. The literature suggests physical injury, pain, inflammation, and acute or chronic physiological or psychological stress can alter the vertebral column’s central neural motor control, leading to a CSMC problem. The many gaps in the literature have been identified, along with suggestions for future studies. Conclusion Spinal adjustments of CSMC problems impact motor control in a variety of ways. These include increasing muscle force and preventing fatigue. These changes in neuromuscular function most likely occur due to changes in supraspinal excitability. The current contemporary model of the CSMC problem, and our understanding of the mechanisms of spinal adjustments, provide a biologically plausible explanation for how the vertebral column’s central neural motor control can dysfunction, can lead to a self-perpetuating central segmental motor control problem, and how HVLA spinal adjustments can improve neuromuscular function.
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Levillain A, Ahmed S, Kaimaki DM, Schuler S, Barros S, Labonte D, Iatridis J, Nowlan N. Prenatal muscle forces are necessary for vertebral segmentation and disc structure, but not for notochord involution in mice. Eur Cell Mater 2021; 41:558-575. [PMID: 34021906 PMCID: PMC8268087 DOI: 10.22203/ecm.v041a36] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Embryonic muscle forces are necessary for normal vertebral development and spinal curvature, but their involvement in intervertebral disc (IVD) development remains unclear. The aim of the current study was to determine how muscle contractions affect (1) notochord involution and vertebral segmentation, and (2) IVD development including the mechanical properties and morphology, as well as collagen fibre alignment in the annulus fibrosus. Muscular dysgenesis (mdg) mice were harvested at three prenatal stages: at Theiler Stage (TS)22 when notochord involution starts, at TS24 when involution is complete, and at TS27 when the IVD is formed. Vertebral and IVD development were characterised using histology, immunofluorescence, and indentation testing. The results revealed that notochord involution and vertebral segmentation occurred independently of muscle contractions between TS22 and TS24. However, in the absence of muscle contractions, we found vertebral fusion in the cervical region at TS27, along with (i) a displacement of the nucleus pulposus towards the dorsal side, (ii) a disruption of the structural arrangement of collagen in the annulus fibrosus, and (iii) an increase in viscous behaviour of the annulus fibrosus. These findings emphasise the important role of mechanical forces during IVD development, and demonstrate a critical role of muscle loading during development to enable proper annulus fibrosus formation. They further suggest a need for mechanical loading in the creation of fibre-reinforced tissue engineering replacement IVDs as a therapy for IVD degeneration.
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Affiliation(s)
- A. Levillain
- Department of Bioengineering, Imperial College London, London, UK,Université de Lyon, Université Claude Bernard Lyon 1, INSERM, LYOS UMR 1033, Lyon, France
| | - S. Ahmed
- Department of Bioengineering, Imperial College London, London, UK
| | - D-M. Kaimaki
- Department of Bioengineering, Imperial College London, London, UK
| | - S. Schuler
- Department of Bioengineering, Imperial College London, London, UK
| | - S. Barros
- Department of Bioengineering, Imperial College London, London, UK
| | - D. Labonte
- Department of Bioengineering, Imperial College London, London, UK
| | - J.C. Iatridis
- Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - N.C. Nowlan
- Department of Bioengineering, Imperial College London, London, UK,School of Mechanical and Materials Engineering, University College Dublin, Dublin, Ireland,UCD Conway Institute, University College Dublin, Dublin, Ireland,Address for correspondence: Niamh C. Nowlan, Department of Bioengineering, Imperial College London, London SW72AZ, UK. Telephone number: +44 2075945189
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Wu YT, Tang MX, Wang YJ, Li J, Wang YX, Deng A, Guo CF, Zhang HQ. Lower androgen levels promote abnormal cartilage development in female patients with adolescent idiopathic scoliosis. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:784. [PMID: 34268397 PMCID: PMC8246169 DOI: 10.21037/atm-20-3171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 01/25/2021] [Indexed: 11/14/2022]
Abstract
Background Adolescent idiopathic scoliosis (AIS) is a disease characterized by changes in the three-dimensional structure of the spine. Studies have shown that the development of AIS might be associated with genetic, biomechanics, endocrine factors and abnormal bone or cartilage development. Methods Blood samples collected from 301 female patients (161 females with AIS and 140 females without AIS) were used for genotyping. Forty-eight serum samples from 161 females with AIS and 40 serum samples from 140 females without AIS were subjected to enzyme-linked immunosorbent assays (ELISAs). We also evaluated 32 facet joints (18 females with AIS and 14 females without AIS from the 301 female patients) using immunohistochemistry, Western blotting, and isolation of human primary chondrocytes, among other methods. We treated the AIS primary chondrocytes with dihydrotestosterone (DHT) to verify the relationship among androgen, the androgen receptor (AR), and its downstream pathway proteins. Results The serum androgen level in the AIS group was significantly decreased (1.94±0.09 vs. 2.284±0.103) compared with that in the non-AIS (control) group. The single nucleotide polymorphism genotyping results showed that the mutation rates of rs6259 between the AIS and control groups were significantly different (G/G genotype: 48.4% vs. 42.1%, G/A genotype: 40.4% vs. 35.7%, P<0.05). The levels of interleukin (IL)-6 and metalloproteinase (MMP)-13 were increased in the cartilage of AIS patients, and these patients also exhibited decreased AR levels. The cell experiment results showed that androgen reduced the degree of abnormal cartilage development in female AIS patients through the AR/IL-6/signal transducer and activator of transcription 3 (STAT3) signaling pathway. Conclusions Our study provides a new perspective on the pathogenesis of AIS and indicates that decreased androgen levels in female AIS patients play a potential role in the development of AIS via the AR/IL-6/STAT3 signaling pathway.
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Affiliation(s)
- Yuan-Tao Wu
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China.,Department of Spine Surgery, Hainan General Hospital and Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Ming-Xing Tang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Yun-Jia Wang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Jiong Li
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Yu-Xiang Wang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Ang Deng
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Chao-Feng Guo
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Hong-Qi Zhang
- Department of Spine Surgery and Orthopaedics, Xiangya Hospital, Central South University, Changsha, China.,National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
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Adolescent Idiopathic Scoliosis: Fishy Tales of Crooked Spines. Trends Genet 2021; 37:612-615. [PMID: 33858671 DOI: 10.1016/j.tig.2021.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 12/28/2022]
Abstract
Adolescent idiopathic scoliosis (AIS) is a common skeletal disorder, characterized by abnormal spine curvatures. In zebrafish, cilia-driven cerebrospinal fluid flow and urotensin II pathway activity are required for proper spine morphogenesis. Genetic studies with AIS patients now establish a conservation of the zebrafish findings in the etiology of the disease.
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Bornstein B, Konstantin N, Alessandro C, Tresch MC, Zelzer E. More than movement: the proprioceptive system as a new regulator of musculoskeletal biology. CURRENT OPINION IN PHYSIOLOGY 2021. [DOI: 10.1016/j.cophys.2021.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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41
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Gray RS, Gonzalez R, Ackerman SD, Minowa R, Griest JF, Bayrak MN, Troutwine B, Canter S, Monk KR, Sepich DS, Solnica-Krezel L. Postembryonic screen for mutations affecting spine development in zebrafish. Dev Biol 2021; 471:18-33. [PMID: 33290818 PMCID: PMC10785604 DOI: 10.1016/j.ydbio.2020.11.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 02/07/2023]
Abstract
The spine gives structural support for the adult body, protects the spinal cord, and provides muscle attachment for moving through the environment. The development and maturation of the spine and its physiology involve the integration of multiple musculoskeletal tissues including bone, cartilage, and fibrocartilaginous joints, as well as innervation and control by the nervous system. One of the most common disorders of the spine in human is adolescent idiopathic scoliosis (AIS), which is characterized by the onset of an abnormal lateral curvature of the spine of <10° around adolescence, in otherwise healthy children. The genetic basis of AIS is largely unknown. Systematic genome-wide mutagenesis screens for embryonic phenotypes in zebrafish have been instrumental in the understanding of early patterning of embryonic tissues necessary to build and pattern the embryonic spine. However, the mechanisms required for postembryonic maturation and homeostasis of the spine remain poorly understood. Here we report the results from a small-scale forward genetic screen for adult-viable recessive and dominant zebrafish mutations, leading to overt morphological abnormalities of the adult spine. Germline mutations induced with N-ethyl N-nitrosourea (ENU) were transmitted and screened for dominant phenotypes in 1229 F1 animals, and subsequently bred to homozygosity in F3 families; from these, 314 haploid genomes were screened for adult-viable recessive phenotypes affecting general body shape. We cumulatively found 40 adult-viable (3 dominant and 37 recessive) mutations each leading to a defect in the morphogenesis of the spine. The largest phenotypic group displayed larval onset axial curvatures, leading to whole-body scoliosis without vertebral dysplasia in adult fish. Pairwise complementation testing of 16 mutant lines within this phenotypic group revealed at least 9 independent mutant loci. Using massively-parallel whole genome or whole exome sequencing and meiotic mapping we defined the molecular identity of several loci for larval onset whole-body scoliosis in zebrafish. We identified a new mutation in the skolios/kinesin family member 6 (kif6) gene, causing neurodevelopmental and ependymal cilia defects in mouse and zebrafish. We also report multiple recessive alleles of the scospondin and a disintegrin and metalloproteinase with thrombospondin motifs 9 (adamts9) genes, which all display defects in spine morphogenesis. Our results provide evidence of monogenic traits that are essential for normal spine development in zebrafish, that may help to establish new candidate risk loci for spine disorders in humans.
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Affiliation(s)
- Ryan S Gray
- Department of Nutritional Sciences, Dell Pediatric Research Institute, University of Texas at Austin, Austin, TX, USA; Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA.
| | - Roberto Gonzalez
- Department of Nutritional Sciences, Dell Pediatric Research Institute, University of Texas at Austin, Austin, TX, USA
| | - Sarah D Ackerman
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Ryoko Minowa
- Department of Nutritional Sciences, Dell Pediatric Research Institute, University of Texas at Austin, Austin, TX, USA
| | - Johanna F Griest
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Melisa N Bayrak
- Department of Nutritional Sciences, Dell Pediatric Research Institute, University of Texas at Austin, Austin, TX, USA
| | - Benjamin Troutwine
- Department of Nutritional Sciences, Dell Pediatric Research Institute, University of Texas at Austin, Austin, TX, USA
| | - Stephen Canter
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Kelly R Monk
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA; Vollum Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Rd, Portland, OR, 97239, USA.
| | - Diane S Sepich
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA
| | - Lilianna Solnica-Krezel
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO, USA.
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Luo M, Zhang Y, Huang S, Song Y. The Susceptibility and Potential Functions of the LBX1 Gene in Adolescent Idiopathic Scoliosis. Front Genet 2021; 11:614984. [PMID: 33537061 PMCID: PMC7848184 DOI: 10.3389/fgene.2020.614984] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 12/21/2020] [Indexed: 02/05/2023] Open
Abstract
Genome-wide association studies have identified many susceptibility genes for adolescent idiopathic scoliosis (AIS). However, most of the results are hard to be replicated in multi-ethnic populations. LBX1 is the most promising candidate gene in the etiology of AIS. We aimed to appraise the literature for the association of LBX1 gene polymorphisms with susceptibility and curve progression in AIS. We also reviewed the function of the LBX1 gene in muscle progenitor cell migration and neuronal determination processes. Three susceptibility loci (rs11190870, rs625039, and rs11598564) near the LBX1 gene, as well as another susceptibility locus (rs678741), related to LBX1 regulation, have been successfully verified to have robust associations with AIS in multi-ethnic populations. The LBX1 gene plays an essential role in regulating the migration and proliferation of muscle precursor cells, and it is known to play a role in neuronal determination processes, especially for the fate of somatosensory relay neurons. The LBX1 gene is the most promising candidate gene in AIS susceptibility due to its position and possible functions in muscle progenitor cell migration and neuronal determination processes. The causality between susceptibility loci related to the LBX1 gene and the pathogenesis of AIS deserves to be explored with further integrated genome-wide and epigenome-wide association studies.
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Affiliation(s)
- Ming Luo
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yuxiao Zhang
- West China Hospital and West China School of Medicine, Sichuan University, Chengdu, China
| | - Shishu Huang
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yueming Song
- Department of Orthopedics, Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
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Kröger S, Watkins B. Muscle spindle function in healthy and diseased muscle. Skelet Muscle 2021; 11:3. [PMID: 33407830 PMCID: PMC7788844 DOI: 10.1186/s13395-020-00258-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 12/20/2020] [Indexed: 12/16/2022] Open
Abstract
Almost every muscle contains muscle spindles. These delicate sensory receptors inform the central nervous system (CNS) about changes in the length of individual muscles and the speed of stretching. With this information, the CNS computes the position and movement of our extremities in space, which is a requirement for motor control, for maintaining posture and for a stable gait. Many neuromuscular diseases affect muscle spindle function contributing, among others, to an unstable gait, frequent falls and ataxic behavior in the affected patients. Nevertheless, muscle spindles are usually ignored during examination and analysis of muscle function and when designing therapeutic strategies for neuromuscular diseases. This review summarizes the development and function of muscle spindles and the changes observed under pathological conditions, in particular in the various forms of muscular dystrophies.
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Affiliation(s)
- Stephan Kröger
- Department of Physiological Genomics, Biomedical Center, Ludwig-Maximilians-University Munich, Großhaderner Str. 9, 82152, Planegg-Martinsried, Germany.
| | - Bridgette Watkins
- Department of Physiological Genomics, Biomedical Center, Ludwig-Maximilians-University Munich, Großhaderner Str. 9, 82152, Planegg-Martinsried, Germany
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Abstract
The vertebrate body plan is characterized by the presence of a segmented spine along its main axis. Here, we examine the current understanding of how the axial tissues that are formed during embryonic development give rise to the adult spine and summarize recent advances in the field, largely focused on recent studies in zebrafish, with comparisons to amniotes where appropriate. We discuss recent work illuminating the genetics and biological mechanisms mediating extension and straightening of the body axis during development, and highlight open questions. We specifically focus on the processes of notochord development and cerebrospinal fluid physiology, and how defects in those processes may lead to scoliosis.
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Affiliation(s)
- Michel Bagnat
- Department of Cell Biology, Duke University, Durham, NC, 27710, USA
| | - Ryan S Gray
- Department of Nutritional Sciences, University of Texas at Austin, Dell Pediatrics Research Institute, Austin, TX, 78723, USA
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Lleras-Forero L, Newham E, Teufel S, Kawakami K, Hartmann C, Hammond CL, Knight RD, Schulte-Merker S. Muscle defects due to perturbed somite segmentation contribute to late adult scoliosis. Aging (Albany NY) 2020; 12:18603-18621. [PMID: 32979261 PMCID: PMC7585121 DOI: 10.18632/aging.103856] [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: 03/03/2020] [Accepted: 07/14/2020] [Indexed: 01/24/2023]
Abstract
Scoliosis is an abnormal bending of the body axis. Truncated vertebrae or a debilitated ability to control the musculature in the back can cause this condition, but in most cases the causative reason for scoliosis is unknown (idiopathic). Using mutants for somite clock genes with mild defects in the vertebral column, we here show that early defects in somitogenesis are not overcome during development and have long lasting and profound consequences for muscle fiber organization, structure and whole muscle volume. These mutants present only mild alterations in the vertebral column, and muscle shortcomings are uncoupled from skeletal defects. None of the mutants presents an overt musculoskeletal phenotype at larval or early adult stages, presumably due to compensatory growth mechanisms. Scoliosis becomes only apparent during aging. We conclude that adult degenerative scoliosis is due to disturbed crosstalk between vertebrae and muscles during early development, resulting in subsequent adult muscle weakness and bending of the body axis.
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Affiliation(s)
- Laura Lleras-Forero
- Institute for Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WWU, Münster, Germany,Hubrecht Institute-KNAW and University Medical Center Utrecht, CT, Utrecht, The Netherlands
| | - Elis Newham
- The School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences, University of Bristol, Bristol, UK
| | - Stefan Teufel
- Institut für Muskuloskelettale Medizin (IMM), Abteilung Knochen- und Skelettforschung, Universitätsklinikum Münster, Germany
| | - Koichi Kawakami
- Laboratory of Molecular and Developmental Biology, National Institute of Genetics, Mishima, Shizuoka, Japan
| | - Christine Hartmann
- Institut für Muskuloskelettale Medizin (IMM), Abteilung Knochen- und Skelettforschung, Universitätsklinikum Münster, Germany
| | - Chrissy L. Hammond
- The School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences, University of Bristol, Bristol, UK
| | - Robert D. Knight
- Centre for Craniofacial and Regenerative Biology, King´s College London, London, UK
| | - Stefan Schulte-Merker
- Institute for Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WWU, Münster, Germany,Hubrecht Institute-KNAW and University Medical Center Utrecht, CT, Utrecht, The Netherlands
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46
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Bearce EA, Grimes DT. On being the right shape: Roles for motile cilia and cerebrospinal fluid flow in body and spine morphology. Semin Cell Dev Biol 2020; 110:104-112. [PMID: 32693941 DOI: 10.1016/j.semcdb.2020.07.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 07/07/2020] [Accepted: 07/07/2020] [Indexed: 12/12/2022]
Abstract
How developing and growing organisms attain their proper shape is a central problem of developmental biology. In this review, we investigate this question with respect to how the body axis and spine form in their characteristic linear head-to-tail fashion in vertebrates. Recent work in the zebrafish has implicated motile cilia and cerebrospinal fluid flow in axial morphogenesis and spinal straightness. We begin by introducing motile cilia, the fluid flows they generate and their roles in zebrafish development and growth. We then describe how cilia control body and spine shape through sensory cells in the spinal canal, a thread-like extracellular structure called the Reissner fiber, and expression of neuropeptide signals. Last, we discuss zebrafish mutants in which spinal straightness breaks down and three-dimensional curves form. These curves resemble the common but little-understood human disease Idiopathic Scoliosis. Zebrafish research is therefore poised to make progress in our understanding of this condition and, more generally, how body and spine shape is acquired and maintained through development and growth.
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Affiliation(s)
- Elizabeth A Bearce
- Institute of Molecular Biology, Department of Biology, University of Oregon, Eugene, OR, 97403, USA.
| | - Daniel T Grimes
- Institute of Molecular Biology, Department of Biology, University of Oregon, Eugene, OR, 97403, USA.
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Brzoska E, Kalkowski L, Kowalski K, Michalski P, Kowalczyk P, Mierzejewski B, Walczak P, Ciemerych MA, Janowski M. Muscular Contribution to Adolescent Idiopathic Scoliosis from the Perspective of Stem Cell-Based Regenerative Medicine. Stem Cells Dev 2020; 28:1059-1077. [PMID: 31170887 DOI: 10.1089/scd.2019.0073] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Adolescent idiopathic scoliosis (AIS) is a relatively frequent disease within a range 0.5%-5.0% of population, with higher frequency in females. While a resultant spinal deformity is usually medically benign condition, it produces far going psychosocial consequences, which warrant attention. The etiology of AIS is unknown and current therapeutic approaches are symptomatic only, and frequently inconvenient or invasive. Muscular contribution to AIS is widely recognized, although it did not translate to clinical routine as yet. Muscle asymmetry has been documented by pathological examinations as well as systemic muscle disorders frequently leading to scoliosis. It has been also reported numerous genetic, metabolic and radiological alterations in patients with AIS, which are linked to muscular and neuromuscular aspects. Therefore, muscles might be considered an attractive and still insufficiently exploited therapeutic target for AIS. Stem cell-based regenerative medicine is rapidly gaining momentum based on the tremendous progress in understanding of developmental biology. It comes also with a toolbox of various stem cells such as satellite cells or mesenchymal stem cells, which could be transplanted; also, the knowledge acquired in research on regenerative medicine can be applied to manipulation of endogenous stem cells to obtain desired therapeutic goals. Importantly, paravertebral muscles are located relatively superficially; therefore, they can be an easy target for minimally invasive approaches to treatment of AIS. It comes in pair with a fast progress in image guidance, which allows for precise delivery of therapeutic agents, including stem cells to various organs such as brain, muscles, and others. Summing up, it seems that there is a link between AIS, muscles, and stem cells, which might be worth of further investigations with a long-term goal of setting foundations for eventual bench-to-bedside translation.
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Affiliation(s)
- Edyta Brzoska
- 1Department of Cytology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Lukasz Kalkowski
- 2Department of Neurology and Neurosurgery, Faculty of Medical Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Kamil Kowalski
- 1Department of Cytology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Pawel Michalski
- 3Spine Surgery Department, Institute of Mother and Child, Warsaw, Poland
| | - Pawel Kowalczyk
- 4Department of Neurosurgery, Children's Memorial Health Institute, Warsaw, Poland
| | - Bartosz Mierzejewski
- 1Department of Cytology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Piotr Walczak
- 5Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland.,6Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Maria A Ciemerych
- 1Department of Cytology, Faculty of Biology, University of Warsaw, Warsaw, Poland
| | - Miroslaw Janowski
- 5Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, Maryland.,6Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland
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48
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Assaraf E, Blecher R, Heinemann-Yerushalmi L, Krief S, Carmel Vinestock R, Biton IE, Brumfeld V, Rotkopf R, Avisar E, Agar G, Zelzer E. Piezo2 expressed in proprioceptive neurons is essential for skeletal integrity. Nat Commun 2020; 11:3168. [PMID: 32576830 PMCID: PMC7311488 DOI: 10.1038/s41467-020-16971-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 05/26/2020] [Indexed: 11/24/2022] Open
Abstract
In humans, mutations in the PIEZO2 gene, which encodes for a mechanosensitive ion channel, were found to result in skeletal abnormalities including scoliosis and hip dysplasia. Here, we show in mice that loss of Piezo2 expression in the proprioceptive system recapitulates several human skeletal abnormalities. While loss of Piezo2 in chondrogenic or osteogenic lineages does not lead to human-like skeletal abnormalities, its loss in proprioceptive neurons leads to spine malalignment and hip dysplasia. To validate the non-autonomous role of proprioception in hip joint morphogenesis, we studied this process in mice mutant for proprioceptive system regulators Runx3 or Egr3. Loss of Runx3 in the peripheral nervous system, but not in skeletal lineages, leads to similar joint abnormalities, as does Egr3 loss of function. These findings expand the range of known regulatory roles of the proprioception system on the skeleton and provide a central component of the underlying molecular mechanism, namely Piezo2.
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Affiliation(s)
- Eran Assaraf
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel
- Department of Orthopedic Surgery, Assaf HaRofeh Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Zerrifin, 70300, Israel
| | - Ronen Blecher
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel
- Department of Orthopedic Surgery, Assuta Ashdod University Hospital, Ashdod, 7747629, Israel
- Ben Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | | | - Sharon Krief
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Ron Carmel Vinestock
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Inbal E Biton
- Department of Veterinary Resources, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Vlad Brumfeld
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Ron Rotkopf
- Bioinformatics Unit, Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Erez Avisar
- Department of Orthopedic Surgery, Assaf HaRofeh Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Zerrifin, 70300, Israel
| | - Gabriel Agar
- Department of Orthopedic Surgery, Assaf HaRofeh Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Zerrifin, 70300, Israel
| | - Elazar Zelzer
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, 76100, Israel.
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49
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Helmbacher F, Stricker S. Tissue cross talks governing limb muscle development and regeneration. Semin Cell Dev Biol 2020; 104:14-30. [PMID: 32517852 DOI: 10.1016/j.semcdb.2020.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 12/14/2022]
Abstract
For decades, limb development has been a paradigm of three-dimensional patterning. Moreover, as the limb muscles and the other tissues of the limb's musculoskeletal system arise from distinct developmental sources, it has been a prime example of integrative morphogenesis and cross-tissue communication. As the limbs grow, all components of the musculoskeletal system (muscles, tendons, connective tissue, nerves) coordinate their growth and differentiation, ultimately giving rise to a functional unit capable of executing elaborate movement. While the molecular mechanisms governing global three-dimensional patterning and formation of the skeletal structures of the limbs has been a matter of intense research, patterning of the soft tissues is less understood. Here, we review the development of limb muscles with an emphasis on their interaction with other tissue types and the instructive roles these tissues play. Furthermore, we discuss the role of adult correlates of these embryonic accessory tissues in muscle regeneration.
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Affiliation(s)
| | - Sigmar Stricker
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195, Berlin, Germany.
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50
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A fellowship of firsts: report of the 2019 SRS traveling fellowship. Spine Deform 2020; 8:157-164. [PMID: 32052356 DOI: 10.1007/s43390-020-00062-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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