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Wang L, Jiang W, Zhao S, Xie D, Chen Q, Zhao Q, Wu H, Luo J, Yang L. Sorafenib inhibits ossification of the posterior longitudinal ligament by blocking LOXL2-mediated vascularization. Bone Res 2024; 12:24. [PMID: 38594260 PMCID: PMC11004159 DOI: 10.1038/s41413-024-00327-7] [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: 05/24/2023] [Revised: 03/10/2024] [Accepted: 03/16/2024] [Indexed: 04/11/2024] Open
Abstract
Ossification of the Posterior Longitudinal Ligament (OPLL) is a degenerative hyperostosis disease characterized by the transformation of the soft and elastic vertebral ligament into bone, resulting in limited spinal mobility and nerve compression. Employing both bulk and single-cell RNA sequencing, we elucidate the molecular characteristics, cellular components, and their evolution during the OPLL process at a single-cell resolution, and validate these findings in clinical samples. This study also uncovers the capability of ligament stem cells to exhibit endothelial cell-like phenotypes in vitro and in vivo. Notably, our study identifies LOXL2 as a key regulator in this process. Through gain-and loss-of-function studies, we elucidate the role of LOXL2 in the endothelial-like differentiation of ligament cells. It acts via the HIF1A pathway, promoting the secretion of downstream VEGFA and PDGF-BB. This function is not related to the enzymatic activity of LOXL2. Furthermore, we identify sorafenib, a broad-spectrum tyrosine kinase inhibitor, as an effective suppressor of LOXL2-mediated vascular morphogenesis. By disrupting the coupling between vascularization and osteogenesis, sorafenib demonstrates significant inhibition of OPLL progression in both BMP-induced and enpp1 deficiency-induced animal models while having no discernible effect on normal bone mass. These findings underscore the potential of sorafenib as a therapeutic intervention for OPLL.
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Affiliation(s)
- Longqing Wang
- Spine Center, Department of Orthopaedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, PR China
| | - Wenhao Jiang
- Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center), Tongji University School of Medicine, Shanghai, PR China
| | - Siyuan Zhao
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, PR China
| | - Dong Xie
- Department of Orthopaedics, No. 905 Hospital of PLA Navy, Shanghai, PR China
| | - Qing Chen
- Spine Center, Department of Orthopaedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, PR China
| | - Qi Zhao
- Spine Center, Department of Orthopaedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, PR China
| | - Hao Wu
- Spine Center, Department of Orthopaedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, PR China
| | - Jian Luo
- Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center), Tongji University School of Medicine, Shanghai, PR China.
| | - Lili Yang
- Spine Center, Department of Orthopaedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, PR China.
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Park J, Cho YE, Kim KH, Shin S, Kim S, Lim CH, Chung SY, Park YG. Correlation Between the Severity of Multifidus Fatty Degeneration and the Size of Ossification of Posterior Longitudinal Ligament at Each Spinal Level. Neurospine 2023; 20:921-930. [PMID: 37798986 PMCID: PMC10562234 DOI: 10.14245/ns.2346506.253] [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: 04/27/2023] [Revised: 06/14/2023] [Accepted: 06/20/2023] [Indexed: 10/07/2023] Open
Abstract
OBJECTIVE This study aimed to investigate the correlation between ossification of the posterior longitudinal ligament (OPLL) size and multifidus fatty degeneration (MFD), hypothesizing that larger OPLL sizes are associated with worse MFD. METHODS One hundred four patients with cervical OPLL who underwent surgery were screened. OPLL occupying diameter and area ratios, the severity of MFD using the Goutallier classification, and range of motion (ROM) of cervical flexion-extension (ΔCobb) were measured. Correlation analyses between OPLL size, MFD severity, and ΔCobb were conducted. MFD severity was compared for each OPLL type using one-way analysis of variance. RESULTS The final clinical data from 100 patients were analyzed. The average Goutallier grade of C2-7 significantly correlated with the average OPLL diameter and area occupying ratios, and OPLL involved vertebral level (r = 0.58, p < 0.01; r = 0.40, p < 0.01; r = 0.47, p < 0.01, respectively). The OPLL size at each cervical level significantly correlated with MFD of the same or 1-3 adjacent levels. ΔCobb angle was negatively correlated with the average Goutallier grade (r = -0.31, p < 0.01) and average OPLL occupying diameter and area ratios (r = -0.31, p < 0.01; r = -0.35, p < 0.01, respectively). Patients with continuous OPLL exhibited worse MFD than those with segmental OPLL (p < 0.01). CONCLUSION OPLL size is clinically correlated with MFD and cervical ROM. OPLL at one spinal level affects MFD at the same and 1-3 adjacent spinal levels. The worsening severity of MFD is associated with the longitudinal continuity of OPLL.
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Affiliation(s)
- Jinyoung Park
- Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Yong Eun Cho
- Department of Neurosurgery, Spine and Spinal Cord Institute, Gangnam Severance Spine Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Kyung Hyun Kim
- Department of Neurosurgery, Spine and Spinal Cord Institute, Gangnam Severance Spine Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Sanghoon Shin
- Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Sungjun Kim
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Chae Hwan Lim
- Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Seok Young Chung
- Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Yoon Ghil Park
- Department of Rehabilitation Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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Koike Y, Takahata M, Nakajima M, Otomo N, Suetsugu H, Liu X, Endo T, Imagama S, Kobayashi K, Kaito T, Kato S, Kawaguchi Y, Kanayama M, Sakai H, Tsuji T, Miyamoto T, Inose H, Yoshii T, Kashii M, Nakashima H, Ando K, Taniguchi Y, Takeuchi K, Ito S, Tomizuka K, Hikino K, Iwasaki Y, Kamatani Y, Maeda S, Nakajima H, Mori K, Seichi A, Fujibayashi S, Kanchiku T, Watanabe K, Tanaka T, Kida K, Kobayashi S, Takahashi M, Yamada K, Takuwa H, Lu HF, Niida S, Ozaki K, Momozawa Y, Yamazaki M, Okawa A, Matsumoto M, Iwasaki N, Terao C, Ikegawa S. Genetic insights into ossification of the posterior longitudinal ligament of the spine. eLife 2023; 12:e86514. [PMID: 37461309 DOI: 10.7554/elife.86514] [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: 01/30/2023] [Accepted: 05/22/2023] [Indexed: 07/20/2023] Open
Abstract
Ossification of the posterior longitudinal ligament of the spine (OPLL) is an intractable disease leading to severe neurological deficits. Its etiology and pathogenesis are primarily unknown. The relationship between OPLL and comorbidities, especially type 2 diabetes (T2D) and high body mass index (BMI), has been the focus of attention; however, no trait has been proven to have a causal relationship. We conducted a meta-analysis of genome-wide association studies (GWASs) using 22,016 Japanese individuals and identified 14 significant loci, 8 of which were previously unreported. We then conducted a gene-based association analysis and a transcriptome-wide Mendelian randomization approach and identified three candidate genes for each. Partitioning heritability enrichment analyses observed significant enrichment of the polygenic signals in the active enhancers of the connective/bone cell group, especially H3K27ac in chondrogenic differentiation cells, as well as the immune/hematopoietic cell group. Single-cell RNA sequencing of Achilles tendon cells from a mouse Achilles tendon ossification model confirmed the expression of genes in GWAS and post-GWAS analyses in mesenchymal and immune cells. Genetic correlations with 96 complex traits showed positive correlations with T2D and BMI and a negative correlation with cerebral aneurysm. Mendelian randomization analysis demonstrated a significant causal effect of increased BMI and high bone mineral density on OPLL. We evaluated the clinical images in detail and classified OPLL into cervical, thoracic, and the other types. GWAS subanalyses identified subtype-specific signals. A polygenic risk score for BMI demonstrated that the effect of BMI was particularly strong in thoracic OPLL. Our study provides genetic insight into the etiology and pathogenesis of OPLL and is expected to serve as a basis for future treatment development.
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Affiliation(s)
- Yoshinao Koike
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masahiko Takahata
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masahiro Nakajima
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
| | - Nao Otomo
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
- Department of Orthopedic Surgery, Keio University School of Medicine, Nagoya, Japan
| | - Hiroyuki Suetsugu
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Xiaoxi Liu
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Tsutomu Endo
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Shiro Imagama
- Department of Orthopedics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazuyoshi Kobayashi
- Department of Orthopedics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takashi Kaito
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Satoshi Kato
- Department of Orthopaedic Surgery, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan
| | | | - Masahiro Kanayama
- Department of Orthopedics, Hakodate Central General Hospital, Hakodate, Japan
| | - Hiroaki Sakai
- Department of Orthopaedic Surgery, Spinal Injuries Center, Iizuka, Japan
| | - Takashi Tsuji
- Department of Orthopedic Surgery, Keio University School of Medicine, Nagoya, Japan
- Department of Spine and Spinal Cord Surgery, Fujita Health University, Toyoake, Japan
| | - Takeshi Miyamoto
- Department of Orthopedic Surgery, Keio University School of Medicine, Nagoya, Japan
- Department of Orthopedic Surgery, Kumamoto University, Kumamoto, Japan
| | - Hiroyuki Inose
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toshitaka Yoshii
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Masafumi Kashii
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Suita, Japan
| | - Hiroaki Nakashima
- Department of Orthopedics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kei Ando
- Department of Orthopedics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuki Taniguchi
- Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kazuhiro Takeuchi
- Department of Orthopaedic Surgery, National Okayama Medical Center, Okayama, Japan
| | - Shuji Ito
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
- Department of Orthopedic Surgery, Shimane University Faculty of Medicine, Izumo, Japan
| | - Kohei Tomizuka
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Keiko Hikino
- Laboratory for Pharmacogenomics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Yusuke Iwasaki
- Laboratory for Genotyping Development, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Yoichiro Kamatani
- Laboratory for Statistical Analysis, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Shingo Maeda
- Department of Bone and Joint Medicine, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Hideaki Nakajima
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kanji Mori
- Department of Orthopaedic Surgery, Shiga University of Medical Science, Otsu, Japan
| | - Atsushi Seichi
- Department of Orthopedics, Jichi Medical University, Shimotsuke, Japan
| | - Shunsuke Fujibayashi
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tsukasa Kanchiku
- Department of Orthopedic Surgery, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Kei Watanabe
- Department of Orthopaedic Surgery, Niigata University Medical and Dental General Hospital, Nankoku, Japan
| | - Toshihiro Tanaka
- Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazunobu Kida
- Department of Orthopaedic Surgery, Kochi Medical School, Nankoku, Japan
| | - Sho Kobayashi
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Masahito Takahashi
- Department of Orthopaedic Surgery, Kyorin University School of Medicine, Tokyo, Japan
| | - Kei Yamada
- Department of Orthopaedic Surgery, Kurume University School of Medicine, Obu, Japan
| | - Hiroshi Takuwa
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Department of Orthopedic Surgery, Shimane University Faculty of Medicine, Izumo, Japan
| | - Hsing-Fang Lu
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Million-Person Precision Medicine Initiative, China Medical University Hospital, Taichung, Taiwan
| | - Shumpei Niida
- Core Facility Administration, Research Institute, National Center for Geriatrics and Gerontology, Obu, Japan
| | - Kouichi Ozaki
- Medical Genome Center, Research Institute, National Center for Geriatrics and Gerontology, Obu, Japan
| | - Yukihide Momozawa
- Laboratory for Genotyping Development, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Masashi Yamazaki
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Atsushi Okawa
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Morio Matsumoto
- Department of Orthopedic Surgery, Keio University School of Medicine, Nagoya, Japan
| | - Norimasa Iwasaki
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Chikashi Terao
- Laboratory for Statistical and Translational Genetics, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Shiro Ikegawa
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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Tung NTC, Yahara Y, Yasuda T, Seki S, Suzuki K, Watanabe K, Makino H, Kamei K, Kawaguchi Y. Sacroiliac Joint Variation in Patients With Ossification of the Posterior Longitudinal Ligament. Global Spine J 2023; 13:1474-1480. [PMID: 34510951 PMCID: PMC10448107 DOI: 10.1177/21925682211037593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Retrospective Cohort Study. OBJECTIVES Ossification of the posterior longitudinal ligament (OPLL) reveals heterotopic ossification in the spinal ligament. OPLL also tends to ossify ligaments and entheses throughout the body. However, hallmarks of sacroiliac (SI) joint ossification and its variation in OPLL have not been clarified. Here, we investigated the morphological changes in SI joints in individuals with and without OPLL. METHODS We included 240 age- and sex-matched patients (OPLL+, 120; OPLL-, 120) in the study. SI joint variations were classified into 4 types: Type 1, normal or small peripheral bone irregularity; Type 2, subchondral bone sclerosis and osteophyte formation; Type 3, vacuum phenomenon; and Type 4, bridging osteophyte and bony fusion. Type 4 was further divided into 3 subgroups as previously described. Interactions between the ossified spinal region in OPLL and morphological changes in the SI joint were evaluated. RESULTS SI joint ankylosis occurs more frequently in patients with OPLL (51.7%) than in those without (non-OPLL) (33.3%). The SI joint vacuum phenomenon (49.2%) was the main finding in non-OPLL. SI joint ankylosis in OPLL was characterized by anterior bridging and intra-articular fusion. OPLL patients with multilevel ossification tend to develop degeneration and ankylosis of the SI joints. CONCLUSIONS OPLL conferred a high risk of SI joint ossification compared with non-OPLL, and patients with extensive ossification had a higher rate of SI joint ankylosis. Understanding SI joint variation could help elucidate OPLL etiology and clarify the phenotypic differences in the SI joint between OPLL and other spinal disorders.
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Affiliation(s)
- Nguyen Tran Canh Tung
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
- Department of Trauma and Orthopaedic Surgery, Vietnam Military Medical University, Hanoi, Vietnam
| | - Yasuhito Yahara
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
- Department of Molecular and Medical Pharmacology, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Taketoshi Yasuda
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Shoji Seki
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Kayo Suzuki
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Kenta Watanabe
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Hiroto Makino
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Katsuhiko Kamei
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
| | - Yoshiharu Kawaguchi
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, Japan
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Review of Basic Research about Ossification of the Spinal Ligaments Focusing on Animal Models. J Clin Med 2023; 12:jcm12051958. [PMID: 36902744 PMCID: PMC10003841 DOI: 10.3390/jcm12051958] [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: 01/31/2023] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Ossification of the posterior longitudinal ligament (OPLL) is a heterotopic ossification that may cause spinal cord compression. With the recent development of computed tomography (CT) imaging, it is known that patients with OPLL often have complications related to ossification of other spinal ligaments, and OPLL is now considered part of ossification of the spinal ligaments (OSL). OSL is known to be a multifactorial disease with associated genetic and environmental factors, but its pathophysiology has not been clearly elucidated. To elucidate the pathophysiology of OSL and develop novel therapeutic strategies, clinically relevant and validated animal models are needed. In this review, we focus on animal models that have been reported to date and discuss their pathophysiology and clinical relevance. The purpose of this review is to summarize the usefulness and problems of existing animal models and to help further the development of basic research on OSL.
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Chang C, Zhu J, Li H, Yang Q. Enhanced magnetic resonance imaging manifestations of paediatric intervertebral disc calcification combined with ossification of the posterior longitudinal ligament: case report and literature review. BMC Pediatr 2022; 22:400. [PMID: 35804316 PMCID: PMC9264604 DOI: 10.1186/s12887-022-03461-5] [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: 04/16/2022] [Accepted: 06/30/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Since the first description of paediatric intervertebral disc calcification (IDC) by Báron in 1924, only approximately 400 cases have been reported in the literature. Paediatric IDC combined with ossification of the posterior longitudinal ligament (OPLL) is an even rarer condition, with only 8 cases described in detail to date. In this paper, we present a review of the disease characteristics described in the relevant English language literature and discuss the possible mechanisms of lesion enhancement in contrast-enhanced magnetic resonance imaging (MRI). CASE PRESENTATION In May 2020, a 6-year-old Han nationality girl presented with the chief complaint of neck pain that had lasted for a week. She did not report a history of trauma or a past illness. On admission, there was no personal and family history, congenital diseases, or non-specific infections such as tuberculosis, among others. Further physical examination revealed that the movement of her cervical spine was limited. Computed tomography (CT) and MRI revealed ossification of the intervertebral discs and posterior longitudinal ligament (PLL) at the C4/5 levels and an absence of obvious spinal cord compression. When contrast-enhanced MRI was performed, significant enhancement was observed in the intervertebral discs and PLL at the C4/5 level. We adopted a non-interventional approach and performed an imaging re-examination 8 months later. Both the plain and contrast-enhanced MRI scans indicated swelling in the C4/5 intervertebral discs and disappearance of the previously observed enhancement in the nucleus pulposus (NP) and PLL at the corresponding levels; CT examination revealed that the ossified lesions had been completely resorbed. CONCLUSION Obvious lesion enhancement in contrast-enhanced MRI is an extremely rare manifestation of paediatric IDC combined with OPLL. However, the exact mechanisms of this phenomenon remain unclear. We surmise that it may be caused by a series of biophysical changes related to vertebral endplate injury and repair, but further research will be required for in-depth investigation.
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Affiliation(s)
- Cancan Chang
- Department of Medical Imaging, Bozhou Hospital of Traditional Chinese Medicine, Bozhou, 236800, Anhui, China.,Clinical Medicine Standardisation Training Trainees, Department of Medical Imaging, Anqing Hospital Affiliated to Anhui Medical University, Anqing, 246000, Anhui, China
| | - Juan Zhu
- Department of Medical Imaging, Anqing Hospital Affiliated to Anhui Medical University, Anqing, 246000, Anhui, China
| | - Hongyi Li
- Department of Radiology, The People's Hospital of Liaoning Province, Shenyang, 110016, China
| | - Qing Yang
- Department of Medical Imaging, Anqing Hospital Affiliated to Anhui Medical University, Renmin road, Anqing, 246000, Anhui, China.
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Yayama T, Mori K, Saito H, Fujikawa H, Kitagawa M, Okumura N, Nishizawa K, Nakamura A, Kumagai K, Mimura T, Imai S. Cytokine Profile From the Ligamentum Flavum in Patients with Ossification of the Posterior Longitudinal Ligament in the Cervical Spine. Spine (Phila Pa 1976) 2022; 47:277-285. [PMID: 34919077 DOI: 10.1097/brs.0000000000004302] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Histological, immunohistochemical, and suspension array analyses of cytokine expression in human cervical ossification of the posterior longitudinal ligament (OPLL). OBJECTIVES The aim of this study was to determine whether changes in the cytokine profile reflect the maturation of chondrocytes and osteoblasts are associated with OPLL development. SUMMARY OF BACKGROUND DATA OPLL progresses gradually over a prolonged period and may lead to serious spinal cord complications. However, treatment methods only include conservative therapy for neurological symptoms or surgical decompression, whereas preventive therapy for OPLL remains nonexistent. METHODS Ligamentous samples were harvested from 24 patients with OPLL who underwent spinal surgery, and five control samples from cervical spondylotic myelo/radiculopathy patients without OPLL. Tissue sections were used for immunohistochemical studies and primary cells were cultured from the ligamentous samples for cytokine profiling. Using a suspension array system, concentrations of 27 inflammatory cytokines or growth factors were measured to generate the cytokine profiles. RESULTS Suspension array and immunoblot analysis revealed significant increments in the levels of interleukin (IL)-6, IL-1α, basic fibroblast growth factor, and RANTES in patients with OPLL. Immunohistochemical analysis further revealed that these factors were present in mesenchymal cells within the degenerative portion of the ligamentous matrix. CONCLUSION Our findings suggest that specific changes in the cytokine profile during ossification promote osteoblast differentiation, thereby providing new insights into OPLL pathogenesis. Moreover, this work supports the development of a new therapeutic method for preventing OPLL progression by regulating the cytokine profiles.Level of Evidence: 3.
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Affiliation(s)
- Takafumi Yayama
- Department of Orthopedic Surgery, Shiga University of Medical Science, Setatsukinowa, Otsu, Shiga, Japan
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Koo J, Hwang S, Yoon SH, Shin HJ, Cho BK. Progression of Ossification of Posterior Longitudinal Ligament After Anterior Cervical Discectomy and Fusion in Military Patients Exposed to Minor Trauma. Korean J Neurotrauma 2022; 18:254-267. [PMID: 36381449 PMCID: PMC9634320 DOI: 10.13004/kjnt.2022.18.e55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 11/06/2022] Open
Abstract
Objective Ossification of the posterior longitudinal ligament (OPLL) can progress even after cervical spine surgery and may cause neurological injury as a result of minor trauma. The purpose of this study was to investigate the preventive factors associated with OPLL progression after anterior cervical discectomy and fusion (ACDF), a procedure commonly performed in clinical practice. Methods We retrospectively investigated 295 male soldiers who underwent ACDF surgery between 2012 and 2017. Patients who were followed up for >12 months using dynamic radiography and computed tomography (CT) were included in the study. Radiological parameters investigated included OPLL progression, C2-C7 angles on dynamic radiography, segmental angles, C2-C7 cervical sagittal vertical axis (C2-C7 SVA), and the T1 slope. These parameters were measured preoperatively and 1 year postoperatively. Results A total of 49 patients were enrolled, and 10 patients were confirmed to have OPLL progression. Comparison between the OPLL progression and non-progression groups showed no statistically significant differences in pre- and postoperative cervical range of motion. However, statistically significant differences were observed in the postoperative neutral C2-C7 angle (progression -3.9°±6.4° vs. non-progression -13.4°±7.9°, p=0.001) and the SVA change (progression 5.8±7.9 mm vs. non-progression -3.7±6.3 mm, p=0.00). The cutoff values were -8.01° for the postoperative neutral C2-C7 angle and 1.4 mm for SVA changes. Conclusion Increased SVA (>1.4 mm) and a small postoperative neutral C2-C7 angle (>-8.01°) 1 year after ACDF were associated with OPLL progression. It is important to be mindful of these factors during follow-up after ACDF, because additional surgical treatment may be necessary for OPLL progression due to neurological injury caused by minor trauma.
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Affiliation(s)
- Jungmyung Koo
- Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea
| | - SungHwan Hwang
- Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea
| | - Sang Hoon Yoon
- Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea
| | - Hyung Jin Shin
- Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea
| | - Byung-Kyu Cho
- Department of Neurosurgery, The Armed Forces Capital Hospital, Seongnam, Korea
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CDC5L promotes early chondrocyte differentiation and proliferation by modulating pre-mRNA splicing of SOX9, COL2A1, and WEE1. J Biol Chem 2021; 297:100994. [PMID: 34298017 PMCID: PMC8363834 DOI: 10.1016/j.jbc.2021.100994] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/12/2021] [Accepted: 07/19/2021] [Indexed: 11/23/2022] Open
Abstract
Ossification of the posterior longitudinal ligament (OPLL) of the spine is a common pathological condition that causes intractable myelopathy and radiculopathy, mainly the result of an endochondral ossification-like process. Our previous genome-wide association study identified six susceptibility loci for OPLL, including the cell division cycle 5-like (CDC5L) gene region. Here, we found CDC5L to be expressed in type II collagen-producing chondrocyte-like fibroblasts in human OPLL specimens, as well as in differentiating ATDC5 chondrocytes. Cdc5l siRNA transfection in murine chondrocytes decreased the expression of the early chondrogenic genes Sox9 and Col2a1, diminished the cartilage matrix production, and enhanced the expression of parathyroid-hormone-related protein (a resting chondrocyte marker). We also showed that Cdc5l shRNA suppressed the growth of cultured murine embryonal metatarsal cartilage rudiments and that Cdc5l knockdown suppressed the growth of ATDC5 cells. Fluorescence-activated cell sorting analysis revealed that the G2/M cell cycle transition was blocked; our data showed that Cdc5l siRNA transfection enhanced expression of Wee1, an inhibitor of the G2/M transition. Cdc5l siRNA also decreased the pre-mRNA splicing efficiency of Sox9 and Col2a1 genes in both ATDC5 cells and primary chondrocytes; conversely, loss of Cdc5l resulted in enhanced splicing of Wee1 pre-mRNA. Finally, an RNA-binding protein immunoprecipitation assay revealed that Cdc5l bound directly to these target gene transcripts. Overall, we conclude that Cdc5l promotes both early chondrogenesis and cartilage growth and may play a role in the etiology of OPLL, at least in part by fine-tuning the pre-mRNA splicing of chondrogenic genes and Wee1, thus initiating the endochondral ossification process.
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10
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Kilitci A, Asan Z, Yuceer A, Aykanat O, Durna F. Comparison of the histopathological differences between the spinal material and posterior longitudinal ligament in patients with lumbar disc herniation: A focus on the etiopathogenesis. Ann Saudi Med 2021; 41:115-120. [PMID: 33818148 PMCID: PMC8020649 DOI: 10.5144/0256-4947.2021.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Lumbar disc herniation (LDH) occurs owing to the inability of the posterior longitudinal ligament (PLL) to preserve the disc material within the intervertebral space. There is apparently no study that has investigated the histopathological changes occurring in both PLL and disc material in patients with LDH. OBJECTIVE Investigate and compare the histopathological changes occurring in PLL and disc material of the patients who underwent a surgical operation for LDH. DESIGN Descriptive, cross-sectional. SETTING Pathology and neurosurgery departments of a tertiary health care institution PATIENTS AND METHODS: The study included patients who underwent surgical operation for LDH from January 2018 to May 2019 and whose PLL and disc material were removed together, and had disc degeneration findings that were radiologically and histologically concordant. MAIN OUTCOME MEASURES PLL degeneration scores according to the histopathological findings, changes in disc materials according to the MRI findings, disc degeneration scores according to the histo-pathological findings. SAMPLE SIZE 50. RESULTS MRI and histological examinations showed fully degenerated black discs (Grade 2) in 12 patients, partially degenerated discs (Grade 1) in 29 patients and fresh/acute discs (Grade 0) in 9 patients. The PLL showed grade 0 degeneration in 2 patients, grade 1 degeneration in 23 patients, and grade 2 degeneration in 25 patients. PLL degeneration grades were higher than the disc degeneration grades (P=.002). CONCLUSION Longitudinal ligament degeneration can play a significant role in the pathogenesis of LDH. To the best of our knowledge, this study represents the first to focus on the histopathological changes occurring in both the PLL and disc material in patients with LDH. LIMITATIONS Small sample, retrospective CONFLICT OF INTEREST: None.
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Affiliation(s)
- Asuman Kilitci
- From the Department of Pathology, Faculty of Medicine, Ahi Evran University, Kirsehir, Turkey
| | - Ziya Asan
- From the Department of Neurosurgery, Ahi Evran University, Kirsehir 40100, Turkey
| | - Abdulbaki Yuceer
- From the Department of Neurosurgery, Ahi Evran University, Kirsehir 40100, Turkey
| | - Omer Aykanat
- From the Department of Neurosurgery, Ahi Evran University, Kirsehir 40100, Turkey
| | - Fatih Durna
- From the Department of Neurosurgery, Ahi Evran University, Kirsehir 40100, Turkey
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11
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Leakey JEA, Ali AA, Babb AR, Badgley HL, Davis KJ, Juliar BE, Leakey TI, Lewis SM, Patton RE, Seng JE. Subchronic toxicity evaluation of glucosamine and glucosamine in combination with chondroitin sulfate in obese Zucker rats. Toxicol Appl Pharmacol 2021; 412:115371. [PMID: 33345901 DOI: 10.1016/j.taap.2020.115371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 12/11/2020] [Accepted: 12/14/2020] [Indexed: 12/17/2022]
Abstract
D-glucosamine is a widely consumed dietary supplement used to promote joint health and treat osteoarthritis. It also stimulates intracellular hexosamine flux and increases transforming growth factor β1 (TGFβ1) mRNA expression and insulin resistance in animal studies. The effects of D-glucosamine exposure were investigated in obese Zucker rats. Male (leprfa/leprfa) Zucker rats were exposed to 30, 120, 300 and 600 mg D-glucosamine HCl per kg/day either alone or with chondroitin sulfate (24, 96, 240 and 480 mg/kg/day respectively) for 90 days. After 4 weeks exposure, these doses produced CmaxD-glucosamine concentrations of up to 24 μM in tail vein serum concurrent with a transient 30% increase in blood glucose concentration in the 600 mg/kg/day dose group. D-Glucosamine did not significantly alter body weight, blood glucose or serum insulin levels at any dose tested after 13 weeks exposure, but did increase urinary TGFβ1 concentrations. The Zucker rats developed nephropathy and scrotal sores that were related to their hyperglycemia and obesity, and D-glucosamine exposure exacerbated these conditions to a small extent. The incidence of pulmonary osseous metaplasia was increased in rats exposed to D-glucosamine and a single incidence of adrenal osseous metaplasia was noted in one animal exposed to 600/480 mg D-glucosamine HCl/chondroitin sulfate. These lesions may have been treatment related. These studies suggest that the risk of adverse effects of oral D-glucosamine is small compared to that of hyperglycemia in these animals, but the potential for TGFβ1-mediated pathologies, such as osseous metaplasia and renal nephropathy may be increased.
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Affiliation(s)
- Julian E A Leakey
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America.
| | - A Afshan Ali
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Amy R Babb
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Heidi L Badgley
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Kelly J Davis
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Beth E Juliar
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Tatiana I Leakey
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Sherry M Lewis
- Office of Scientific Coordination, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - Ralph E Patton
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
| | - John E Seng
- Toxicologic Pathology Associates, 3900 NCTR Rd., Jefferson, AR 72079, United States of America
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12
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Expression Analysis of Susceptibility Genes for Ossification of the Posterior Longitudinal Ligament of the Cervical Spine in Human OPLL-related Tissues and a Spinal Hyperostotic Mouse (ttw/ttw). Spine (Phila Pa 1976) 2020; 45:E1460-E1468. [PMID: 32756283 DOI: 10.1097/brs.0000000000003648] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Immunohistochemical and real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis. OBJECTIVE The aim of this study was to analyze the expression of five susceptibility genes (RSPO2, HAO1, CCDC91, RHPH9, and STK38L) for human ossification of the posterior longitudinal ligaments (OPLL) identified in a genome-wide association study. SUMMARY OF BACKGROUND DATA Detailed expression and functional studies for the five susceptibility genes are needed to aid in clarification of the etiology and pathogenesis of OPLL. METHODS Immunostaining, cell culture, and real-time RT-PCR were performed on ossified ligament samples collected during anterior cervical decompression for symptomatic OPLL (n = 39 patients) and on control non-OPLL samples (n = 8 patients). Immunohistochemical analysis in spinal hyperostotic mice (ttw/ttw) (n = 25) was also performed. The sample sections were stained for RSPO2, HAO1, CCDC91, RHPH9, STK38L, Runx2, Sox9, and CD90. The mRNA expression levels of the five susceptibility genes were also analyzed in cultured human OPLL and non-OPLL cells subjected to cyclic tensile strain. RESULTS Immunoreactivity for RSPO2 and Sox9 was evident in proliferating chondrocytes in human OPLL tissues and ttw/ttw mice. Application of cyclic tensile strain to cultured human OPLL cells resulted in increases in mRNA levels for RSPO2, HAO1, and CCDC91. However, individual differences in expression in human OPLL-related samples were seen. HAO1-positive cells were detected only in 3- to 6-week-old ttw/ttw mice that did not simultaneously express RSPO2-positive samples. CONCLUSION Among the five susceptibility genes, RSPO2, HAO1, and CCDC91 might be contributory factors in progression of OPLL. RSPO2 may be involved in endochondral ossification, especially in mixed or continuous type OPLL, HAO1 may be an initiation factor for OPLL that is rarely seen in mature human OPLL samples, and CCDC91 may be associated with progression of ossification caused by mechanical stress. These findings provide important insights into the pathogenesis and therapeutic targets for OPLL. LEVEL OF EVIDENCE N/A.
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13
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Sugita D, Nakajima H, Kokubo Y, Takeura N, Yayama T, Matsumine A. Cyclic tensile strain facilitates ossification of the cervical posterior longitudinal ligament via increased Indian hedgehog signaling. Sci Rep 2020; 10:7231. [PMID: 32350355 PMCID: PMC7190672 DOI: 10.1038/s41598-020-64304-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 04/15/2020] [Indexed: 11/29/2022] Open
Abstract
The pathomechanisms of initiation and progression of ossification of the posterior longitudinal ligament (OPLL) are unclear. Indian hedgehog (Ihh) and related signaling molecules are key factors in normal enchondral ossification. The purpose of this study is to investigate the contribution of mechanical strain to OPLL and the relationship of Ihh with OPLL. Sections of the posterior longitudinal ligament (PLL) were obtained from 49 patients with OPLL and from 7 patients without OPLL. Cultured PLL cells were subjected to 24 hours of cyclic tensile strain. To identify differentially expressed genes associated with cyclic tensile strain, microarray analysis was performed. Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis identified upregulation of various genes, particularly of the Hedgehog signaling pathway; Ihh and related genes had increased expression compared with controls after 24-hour cyclic tensile strain. In immunoblotting analysis, Ihh, Runx2, Sox9, Gli2, Gli3, and smoothened (SMO) had significantly increased expression after 6- or 12-hour cyclic tensile strain. OPLL samples were strongly immunopositive for Ihh, Sox9, Runx2, Gli2, Gli3, and SMO in the ossification front of OPLL. These results suggest that cyclic tensile strain induces abnormal activation of Ihh and related signaling molecules, and this might be important in the ossification process in OPLL.
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Affiliation(s)
- Daisuke Sugita
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, 23-3 Matsuoka Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
| | - Hideaki Nakajima
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, 23-3 Matsuoka Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan.
| | - Yasuo Kokubo
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, 23-3 Matsuoka Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
| | - Naoto Takeura
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, 23-3 Matsuoka Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
| | - Takafumi Yayama
- Department of Orthopaedic Surgery, Shiga University of Medical Science, Setatsukiwachou, Otsu, Shiga, 520-2192, Japan
| | - Akihiko Matsumine
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences University of Fukui, 23-3 Matsuoka Shimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
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14
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Long-term Outcome of Anterior Cervical Decompression With Fusion for Cervical Ossification of Posterior Longitudinal Ligament Including Postsurgical Remnant Ossified Spinal Lesion. Spine (Phila Pa 1976) 2019; 44:E1452-E1460. [PMID: 31361728 DOI: 10.1097/brs.0000000000003173] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN A retrospective study. OBJECTIVE The aim of this study was to assess the outcome, perioperative complications, and prognostic factors of anterior cervical decompression and fusion (ACDF) in patients with cervical ossification of posterior longitudinal ligament (OPLL). SUMMARY OF BACKGROUND DATA There is little information on the long-term surgical outcome of ACDF including postsurgical remnant ossified spinal lesion. METHODS Between 1993 and 2013, 80 patients with cervical myelopathy towing to OPLL underwent ACDF at our hospital. Among these, 42 patients were followed-up for at least 5 years and their data were analyzed. RESULTS The mean follow-up period was 7.9 ± 2.8 years, and the overall improvement rate was 59.2% ± 15.0%. Although 12 (15.0%) perioperative complications were observed in 6 patients, accompanied by neurological deterioration, none of the patients had chronic complications. Multivariate logistic regression analysis that included the preoperative Japanese Orthopaedic Association (JOA) score, type of OPLL, occupying ratio of OPLL, and number of fused segments and increase in the transverse area of the cord identified the latter parameter as the only independent and significant determinant of radiological and clinical improvement of >50%. Among the patients with remaining ossified spinal lesions out of the decompressed range (16 patients), postoperative progression was observed in 6 cases (14.3%) who were all of the mixed type; floated lesions within the decompressed range did not show progression during the follow-up. Adjacent segment degeneration was seen in nine (21.4%) patients, and neurological signs and symptoms were seen in only three of the nine patients and only one patient required revision surgery. CONCLUSION The long-term clinical outcome of patients with cervical OPLL after ACDF is considered satisfactory. Surgery-related complications and adjacent segment diseases should not be reasons to avoid ACDF. Care should be taken in selecting ACDF with postsurgical remnant ossified spinal lesion, as it could progress postoperatively especially in the mixed type OPLL. LEVEL OF EVIDENCE 4.
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15
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Tetreault L, Nakashima H, Kato S, Kryshtalskyj M, Nagoshi N, Nouri A, Singh A, Fehlings MG. A Systematic Review of Classification Systems for Cervical Ossification of the Posterior Longitudinal Ligament. Global Spine J 2019; 9:85-103. [PMID: 30775213 PMCID: PMC6362555 DOI: 10.1177/2192568217720421] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
DESIGN Systematic review. OBJECTIVE To conduct a systematic review to (1) summarize various classification systems used to describe cervical ossification of the posterior longitudinal ligament (OPLL) and (2) evaluate the diagnostic accuracy of various imaging modalities and the reliability of these classification systems. METHODS A search was performed to identify studies that used a classification system to categorize patients with OPLL. Furthermore, studies were included if they reported the diagnostic accuracy of various imaging modalities or the reliability of a classification system. RESULTS A total of 167 studies were deemed relevant. Five classification systems were developed based on X-ray: the 9-classification system (0.60%); continuous, segmental, mixed, localized or focal, circumscribed and others (92.81%); hook, staple, bridge, and total types (2.40%); distribution of OPLL (2.40%); and K-line classification (4.19%). Six methods were based on computed tomography scans: free-type, contiguous-type, and broken sign (0.60%); hill-, plateau-, square-, mushroom-, irregular-, or round-shaped (5.99%); rectangular, oval, triangular, or pedunculate (1.20%); centralized or laterally deviated (1.80%); plank-, spindle-, or rod-shaped (0.60%); and rule of nine (0.60%). Classification systems based on 3-dimensional computed tomography were bridging and nonbridging (1.20%) and flat, irregular, and localized (0.60%). A single classification system was based on magnetic resonance imaging: triangular, teardrop, or boomerang. Finally, a variation of methods was used to classify OPLL associated with the dura mater (4.19%). CONCLUSIONS The most common method of classification was that proposed by the Japanese Ministry of Health, Labour and Welfare. Other important methods include K-line (+/-), signs of dural ossification, and patterns of distribution.
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Affiliation(s)
- Lindsay Tetreault
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada,These authors contributed equally to this work
| | - Hiroaki Nakashima
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Department of Orthopedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan,These authors contributed equally to this work
| | - So Kato
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada
| | - Michael Kryshtalskyj
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Nagoshi Nagoshi
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Department of Orthopaedic Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Aria Nouri
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Anoushka Singh
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Michael G. Fehlings
- Department of Surgery, Division of Neurosurgery and Spinal Program, University of Toronto, Toronto Western Hospital, Toronto, Ontario, Canada,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada,Michael G. Fehlings, Toronto Western Hospital, 399 Bathurst St, Toronto, Ontario, Canada M5T 2S8.
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16
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Kaliya-Perumal AK, Tan M, Oh JYL. A rare case of extensive cervico-thoracic ossification of the posterior longitudinal ligament causing myelopathy. Biomedicine (Taipei) 2018; 8:27. [PMID: 30474608 PMCID: PMC6254142 DOI: 10.1051/bmdcn/2018080427] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Accepted: 07/25/2018] [Indexed: 11/17/2022] Open
Abstract
Ossification of the posterior longitudinal ligament (OPLL) most commonly occurs in the cervical spine, usually involving two to three segments; however, the disease has the potential to occur anywhere in the spine. We encountered a fifty-one year old male with progressive unsteadiness and bilateral lower limb weakness for a period of six months which eventually became worse resulting in inability to walk without assistance. Neurological examination revealed normal upper limb function; however, the lower limbs demonstrated motor dysfunction. Signs of myelopathy were elicited and the patient was subjected to detailed radiological evaluation. CT and MRI scans revealed an extensive cervico-thoracic continuous OPLL from C3 to T3 causing significant cord compression. In view of the deteriorating neurological status, extensive C3-T3 laminectomy with instrumented posterolateral fusion was done and the patient recovered without any immediate or delayed C5 palsy. This case highlights a rare occurrence or extensive OPLL involving eight segments at the cervico-thoracic region. This report also discusses surgical strategies for managing such extensive presentations and our technique to prevent C5 palsy.
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Affiliation(s)
- Arun-Kumar Kaliya-Perumal
- Department of Orthopaedic Surgery, Spine Division, Tan Tock Seng Hospital, Singapore - Department of Orthopaedic Surgery, Melmaruvathur Adhiparasakthi Institute of Medical Sciences and Research, Tamil Nadu, India
| | - Mark Tan
- Department of Orthopaedic Surgery, Spine Division, Tan Tock Seng Hospital, Singapore
| | - Jacob Yoong Leong Oh
- Department of Orthopaedic Surgery, Spine Division, Tan Tock Seng Hospital, Singapore
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17
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Han Y, Zhang K, Hong Y, Wang J, Liu Q, Zhang Z, Xia H, Tang Y, Li T, Li L, Xue Y, Hong W. miR‐342‐3p promotes osteogenic differentiation via targetingATF3. FEBS Lett 2018; 592:4051-4065. [PMID: 30381822 DOI: 10.1002/1873-3468.13282] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 10/25/2018] [Accepted: 10/26/2018] [Indexed: 12/11/2022]
Affiliation(s)
- Yawei Han
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Kun Zhang
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
| | - Yuheng Hong
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
- School of Medical Imaging Tianjin Medical University China
| | - Jingzhao Wang
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
| | - Qi Liu
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
| | - Zhen Zhang
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
| | - Han Xia
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Yutao Tang
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Tengshuai Li
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Liandong Li
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Yuan Xue
- Department of Orthopaedics Surgery Tianjin Medical University General Hospital Tianjin Medical University China
| | - Wei Hong
- Department of Histology and Embryology School of Basic Medical Sciences Tianjin Medical University China
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18
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Fujihara R, Chiba Y, Nakagawa T, Murakami R, Matsumoto K, Kawauchi M, Fujii T, Shimono R, Yamamoto T, Ueno M. Histomorphometry of ectopic mineralization using undecalcified frozen bone sections. Microsc Res Tech 2018; 81:1318-1324. [PMID: 30295362 DOI: 10.1002/jemt.23140] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/14/2018] [Accepted: 09/02/2018] [Indexed: 11/12/2022]
Abstract
To investigate the correlation between mineral formation and enhanced expressions of some proteins using undecalcified frozen bone sections. Histological studies have revealed that some proteins, such as BMP2, BMPR1A, and Connexin 43, are expressed in and around sites of ectopic ossification. However, the relationship between the expressed proteins considered to be associated with the ossification and mineral formation in vivo is not clear. Ectonucleotide pyrophosphatase phosphodiesterase 1 (ENPP1)-mutant spinal hyperostotic TWY mice and ICR mice as controls were euthanized after calcein labeling, and undecalcified frozen sections were obtained from the middle thoracic spine. Intervertebral disc areas were examined histologically and by measuring calcein-labeled areas and areas showing immunoreactivity for BMP2, BMPR1A, and Connexin 43. Calcein-labeled areas, indicating mineralization in the ectopic mineralization sites, were significantly larger in the mutant mice than in controls. The expression of Connexin 43 was elevated in the annulus fibrosus. Increases in the calcein-labeled areas was not correlated with increases in the areas showing immunoreactivity for Connexin 43 in the annulus fibrosus. There was no statistical correlation between enhanced immunohistochemical expression and elevated calcein-labeled areas. By applying the morphometrical analysis method using undecalcified frozen sections to ENPP1-mutant mice, quantitative evaluation of the mineralization and proteins expressed in the surrounding area in the same animal became possible.
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Affiliation(s)
- Ryuji Fujihara
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan.,Department of Orthopaedic Surgery, Kagawa University, Kagawa, Japan
| | - Yoichi Chiba
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan
| | - Toshitaka Nakagawa
- Division of Research Instrument and Equipment, Life Science Research Center, Kagawa University, Kagawa, Japan
| | - Ryuta Murakami
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan
| | - Koichi Matsumoto
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan
| | - Machi Kawauchi
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan
| | - Takayuki Fujii
- Department of Pediatric Surgery, Kagawa University, Kagawa, Japan
| | - Ryuichi Shimono
- Department of Pediatric Surgery, Kagawa University, Kagawa, Japan
| | - Tetsuji Yamamoto
- Department of Orthopaedic Surgery, Kagawa University, Kagawa, Japan
| | - Masaki Ueno
- Department of Pathology and Host Defense, Kagawa University, Kagawa, Japan
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19
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Two novel BMP-2 variants identified in patients with thoracic ossification of the ligamentum flavum. Eur J Hum Genet 2017; 25:565-571. [PMID: 28145426 DOI: 10.1038/ejhg.2017.2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 12/08/2016] [Accepted: 12/24/2016] [Indexed: 01/22/2023] Open
Abstract
Thoracic ossification of the ligamentum flavum (TOLF)is a common cause of thoracic spinal canal stenosis and has been reported almost exclusively in East Asian countries. In this study, we established a relationship between bone morphogenic protein 2 (BMP-2) and TOLF. We divided patients into two groups according to severity of ossification and identified susceptible loci through exome sequencing. We identified 39 novel likely pathogenic variants in 29 genes in the transforming growth factor-beta (TGF-β) superfamily or TGF-β/BMPs signaling pathway, including two missense variants in BMP-2 (NM_001200.3) exon region, c.460C>G:p.(R154G) and c.584G>T:p.(R195M). Further Sanger sequencing and genotyping suggested the variants were only found in patients with long regional OLF. Bioinformatic assays predicted the two BMP-2 variants to cause significant alterations to gene and protein expression. Functional assays showed upregulation of BMP-2 expression, increased osteogenic marker expression, and enhanced osteogenic differentiation. Collectively, these results suggest a genetic contribution to the pathogenesis of TOLF, particularly in patients with long segment disease, and that nucleotide substitutions associated with increased BMP-2 expression may be involved in TOLF pathogenesis.
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20
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Walker CT, Bonney PA, Martirosyan NL, Theodore N. Genetics Underlying an Individualized Approach to Adult Spinal Disorders. Front Surg 2016; 3:61. [PMID: 27921035 PMCID: PMC5118450 DOI: 10.3389/fsurg.2016.00061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 10/26/2016] [Indexed: 12/22/2022] Open
Abstract
Adult spinal disorders are a significant cause of morbidity across the world and carry significant health and economic burdens. Genetic predispositions are increasingly considered for these conditions and are becoming understood. Advances in molecular technologies since the mid-1990s have made possible genetic characterizations of these diseases in many populations, and recent findings have provided insight into the underlying pathophysiologic mechanisms. These studies have made clear the genetic heterogeneity producing clinical phenotypes and suggest that individualized treatments are possible in the future. We review the genetics and heritability of cervical spondylotic myelopathy and ossification of the posterior longitudinal ligament and perform a systematic review of the genetics of adult lumbar degenerative scoliotic deformity, highlighting recent discoveries and the potential for personalized future therapeutics for these patients.
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Affiliation(s)
- Corey T Walker
- Department of Neurosurgery, St. Joseph's Hospital and Medical Center, Barrow Neurological Institute , Phoenix, AZ , USA
| | - Phillip A Bonney
- Department of Neurosurgery, St. Joseph's Hospital and Medical Center, Barrow Neurological Institute , Phoenix, AZ , USA
| | - Nikolay L Martirosyan
- Department of Neurosurgery, St. Joseph's Hospital and Medical Center, Barrow Neurological Institute , Phoenix, AZ , USA
| | - Nicholas Theodore
- Department of Neurosurgery, St. Joseph's Hospital and Medical Center, Barrow Neurological Institute , Phoenix, AZ , USA
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Shi L, Cai G, Shi J, Guo Y, Chen D, Chen D, Yang H. Ossification of the posterior ligament is mediated by osterix via inhibition of the β-catenin signaling pathway. Exp Cell Res 2016; 349:53-59. [PMID: 27693496 DOI: 10.1016/j.yexcr.2016.09.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 09/26/2016] [Accepted: 09/28/2016] [Indexed: 11/29/2022]
Abstract
Ossification of the posterior longitudinal ligament (OPLL) involves ectopic calcification of the spinal ligament preferentially at the cervical spine. OPLL is associated with different diseases and occurs by endochondral ossification, which is associated with the activity of different transcription factors. However, the pathogenesis of OPLL remains unclear. Here, we investigated the role of osterix (Osx), a transcription factor that functions downstream of Runx2 and is an important regulator of osteogenesis, in the process of OPLL in a dexamethasone (Dex)-induced model of spinal ligament ossification. Our results showed that Osx is upregulated in patients with OPLL and during the ossification of ligament cells in parallel with the upregulation of osteogenic markers including osteocalcin (OCN), alkaline phosphatase (ALP) and collagen-1 (Col-1). Dex-induced ossification of ligament cells was associated with the downregulation and inactivation of β-catenin, and these effects were offset by Osx knockdown. Activation of β-catenin signaling abolished the effect of Dex on ossification and the upregulation of osteogenic markers. Taken together, our results suggest that OPLL is mediated by Osx via a mechanism involving the Wnt/β-catenin signaling pathway, providing a basis for further research to identify potential targets for the treatment of OPLL.
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Affiliation(s)
- Lei Shi
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China
| | - Guodong Cai
- Department of Orthopedics, Affiliated Hospital of Taishan Medical University, 706 Taishan Street, Tai'an 271000, Shangdong Province, China
| | - Jiangang Shi
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China
| | - Yongfei Guo
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China
| | - Dechun Chen
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China
| | - Deyu Chen
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China
| | - Haisong Yang
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Shanghai 200003, China.
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Qu X, Chen Z, Fan D, Sun C, Zeng Y, Hou X, Ning S. Notch signaling pathways in human thoracic ossification of the ligamentum flavum. J Orthop Res 2016; 34:1481-91. [PMID: 27208800 DOI: 10.1002/jor.23303] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Accepted: 05/19/2016] [Indexed: 02/04/2023]
Abstract
This study investigated the pathological process of Notch signaling in the osteogenesis of ligamentum flavum tissues and cells, and the associated regulatory mechanisms. Notch receptors, ligands, and target genes were identified by quantitative polymerase chain reaction (qPCR) in ligamentum flavum cells and immunohistochemistry in ligamentum flavum sections from ossification of the ligamentum flavum (OLF) patients and controls. The temporospatial expression patterns of JAG1/Notch2/HES1 in human ligamentum flavum cells during osteogenic differentiation were determined by qPCR. Lentiviral vectors for Notch2 overexpression and knockdown were constructed and transfected into ligamentum flavum cells before osteogenic differentiation to examine the function of Notch signaling pathways in the osteogenic differentiation of ligamentum flavum cells. Alkaline phosphatase, Runx2, Osterix, osteocalcin, and osteopontin mRNA levels, alkaline phosphatase activity, and Alizarin Red staining were used as indicators of osteogenic differentiation. JAG1/Notch2/HES1 mRNA levels were up-regulated in ligamentum flavum cells from OLF patients, which increased during osteogenic differentiation. Immunohistochemical analysis suggested positive Notch2 expression at the ossification front. Down-regulation of Notch2 expression decelerated osteogenic differentiation of ligamentum flavum cells, and Notch2 overexpression promoted osteogenic differentiation of ligamentum flavum cells. Expression of Runx2 and Osterix increased in a manner similar to that of Notch2 during osteogenic differentiation of ligamentum flavum cells, and Notch2 knockdown and overexpression influenced their expression levels. Notch signaling plays an important role in OLF, and Notch may affect the osteogenic differentiation of ligamentum flavum cells via interactions with Runx2 and Osterix.© 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1481-1491, 2016.
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Affiliation(s)
- Xiaochen Qu
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Zhongqiang Chen
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Dongwei Fan
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Chuiguo Sun
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Yan Zeng
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Xiaofei Hou
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
| | - Shanglong Ning
- Department of Orthopaedics, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
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Association of miR-146a, miR-149, miR-196a2, and miR-499 Polymorphisms with Ossification of the Posterior Longitudinal Ligament of the Cervical Spine. PLoS One 2016; 11:e0159756. [PMID: 27454313 PMCID: PMC4959720 DOI: 10.1371/journal.pone.0159756] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 07/07/2016] [Indexed: 12/31/2022] Open
Abstract
Background Ossification of the posterior longitudinal ligament (OPLL) of the spine is considered a multifactorial and polygenic disease. We aimed to investigate the association between four single nucleotide polymorphisms (SNPs) of pre-miRNAs [miR-146aC>G (rs2910164), miR-149T>C (rs2292832), miR-196a2T>C (rs11614913), and miR-499A>G (rs3746444)] and the risk of cervical OPLL in the Korean population. Methods The genotypic frequencies of these four SNPs were analyzed in 207 OPLL patients and 200 controls by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay. Findings For four SNPs in pre-miRNAs, no significant differences were found between OPLL patients and controls. However, subgroup analysis based on OPLL subgroup (continuous: continuous type plus mixed type, segmental: segmental and localized type) showed that miR-499GG genotype was associated with an increased risk of segmental type OPLL (adjusted odds ratio = 4.314 with 95% confidence interval: 1.109–16.78). In addition, some allele combinations (C-T-T-G, G-T-T-A, and G-T-C-G of miR-146a/-149/-196a2/-499) and combined genotypes (miR-149TC/miR-196a2TT) were associated with increased OPLL risk, whereas the G-T-T-G and G-C-C-G allele combinations were associated with decreased OPLL risk. Conclusion The results indicate that GG genotype of miR-499 is associated with significantly higher risks of OPLL in the segmental OPLL group. The miR-146a/-149/-196a2/-499 allele combinations may be a genetic risk factor for cervical OPLL in the Korean population.
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Identification and Functional Characterization of RSPO2 as a Susceptibility Gene for Ossification of the Posterior Longitudinal Ligament of the Spine. Am J Hum Genet 2016; 99:202-7. [PMID: 27374772 DOI: 10.1016/j.ajhg.2016.05.018] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 05/12/2016] [Indexed: 01/10/2023] Open
Abstract
Ossification of the posterior longitudinal ligament of the spine (OPLL) is a common spinal disorder that results from ectopic ossification of the posterior longitudinal ligament and causes intractable myelopathy and radiculopathy. In a previous genome-wide association study (GWAS), we found six loci associated with OPLL; however, susceptibility genes in these loci have not been identified yet. Here, we examined one of the GWAS loci and identified RSPO2 (encoding R-spondin 2) as a susceptibility gene for OPLL. R-spondin 2 is a secreted agonist of canonical Wnt-β-catenin signaling. RSPO2 was decreased in the early stage of chondrocyte differentiation. R-spondin 2 inhibited expression of genes encoding early chondrocyte differentiation markers by activating Wnt-β-catenin signaling. rs374810, the most significantly associated SNP in the GWAS locus in chromosomal region 8q23.1 was located in the chondrocyte promoter region of RSPO2. A transcription factor, CCAAT-enhancer-binding protein β (C/EBPβ), specifically bound to the RSPO2 core promoter region containing rs374810 and increased RSPO2 expression. The risk allele of rs374810 affected the binding of the promoter with C/EBPβ and decreased the RSPO2 transcription in vitro and in vivo. Our genetic and functional data indicate that RSPO2 is a susceptibility gene for OPLL.
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Fukutake K, Ishiwatari T, Takahashi H, Tsuchiya K, Okubo Y, Shinozaki M, Tochigi N, Wakayama M, Nemoto T, Shibuya K, Wada A. Investigation of ossification in the posterior longitudinal ligament using micro-focus X-ray CT scanning and histological examination. Diagn Pathol 2015; 10:205. [PMID: 26589843 PMCID: PMC4654799 DOI: 10.1186/s13000-015-0440-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/12/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Ossification in the posterior longitudinal ligament (PLL) correlates with changes of enthesis during the early stages of development, but this issue remains controversial, as little is known regarding the details of this process. The aim of the present study was to elucidate part of the ossification mechanism. Thus, in the present study, we observed and evaluated minute ossifications in the PLL that did not exhibit symptoms of ossification of the posterior longitudinal ligament (OPLL). METHODS The subjects in the present study were derived from serial autopsy cases from January 2009 to December 2013 at Toho University Omori Medical Center, Japan. Minute ossifications in the PLL from autopsy subjects without any history of OPLL were screened as high-density areas using micro-focus X-ray CT, and the foci were histologically examined. Subsequently, we conducted both micro-focus X-ray CT image analysis and histological examination, and evaluated the correlation between these findings and putative predictive factors reported in previous studies. RESULTS A total of 103 individuals among the 267 subjects involved in the present study were analyzed within the study period. There were no cases involving OPLL identification prior to death, and no subjects presented with neurological symptoms of myelopathy. The incidence of cases involving high-density areas greater than 0.1 mm(2) in the PLL was 46.6 %, half of which revealed mature bone structures inside this area. Thus, the high-density areas comprised three types: a continuous posterior-annular fibrosus type (23 cases), an isolated posterior-annular fibrosus type (11 cases), and a posterior-vertebral type (29 cases). However, a positive correlation was observed between the proportion of high-density areas, age (Pearson r = 0.265, p < 0.01), and HbA1c (Pearson r = 0.294, p < 0.01). Histological examination confirmed that these high-density areas involved calcification with or without mature bone formation. CONCLUSIONS We evaluated minute foci of calcification with and without ossification in the PLL from 103 cadavers, generating the following observations: 1. Minute calcification foci greater than 0.1 mm(2) were observed in the PLL of 48 cases (46.6 %), half of which revealed mature bone structures inside this area (23.3 %). 2. The proportion of minute calcification foci observed in the present study was correlated with age and glucose tolerance, suggesting changes in the OPLL in the early stage. 3. Three different mechanisms of ossification were suggested: The two structures developed behind the disc might reflect the elongation of enthesis or rupture of annular fibrosus, while the remaining structure developed behind the vertebral body might reflect a dystrophic calcification-based bony metaplasia sequence.
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Affiliation(s)
- Katsunori Fukutake
- Department of Orthopedic Surgery, Toho University Omori Medical Center, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Takao Ishiwatari
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Hiroshi Takahashi
- Department of Orthopedic Surgery, Toho University Omori Medical Center, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Kazuaki Tsuchiya
- Department of Orthopedic Surgery, Toho University Omori Medical Center, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Yoichiro Okubo
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Minoru Shinozaki
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Naobumi Tochigi
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Megumi Wakayama
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Tetsuo Nemoto
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
| | - Kazutoshi Shibuya
- Department of Surgical Pathology, Toho University School of Medicine, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan. .,Department of Dermatology, Peking University First Hospital, Beijing, China.
| | - Akihito Wada
- Department of Orthopedic Surgery, Toho University Omori Medical Center, 6-11-1, Omori-Nishi, Ota-Ku, Tokyo, 143-8541, Japan.
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Slobodin G, Rimar D, Boulman N, Kaly L, Rozenbaum M, Rosner I, Odeh M. Entheseal involvement in systemic disorders. Clin Rheumatol 2015; 34:2001-10. [PMID: 26354427 DOI: 10.1007/s10067-015-3068-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 08/30/2015] [Indexed: 12/11/2022]
Abstract
The objective of this study is to review the data on entheseal involvement in systemic disorders. A Pubmed search utilizing the indexing terms "enthesis" and "enthesitis" was conducted and the data pertinent to the aim of the review was extracted and organized in accordance with the preplanned structure of the manuscript. A number of cadaver-based studies, as well as studies using ultrasonography and magnetic resonance imaging, have detailed new distinct aspects of enthesis physiology and pathology in a variety of rheumatic and non-rheumatic systemic disorders. Major progress has been done in characterization of separate components of the enthesis organ, imaging of entheses, elaboration of the role and features of entheseal disease in spondyloarthropathies, juvenile idiopathic arthritis, osteoarthritis, familial Mediterranean fever, hyperuricemia, and other systemic conditions. The knowledge acquired and summarized herein shows that entheses can be affected in various ways in variety of medical disorders with different pathogenesis. Better understanding of the risk factors, mechanisms and natural history of enthesopathies is warranted. The current progress in the understanding of entheseal involvement in systemic disorders represents just the first step in resolving the entheses-related enigmas.
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Affiliation(s)
- Gleb Slobodin
- Internal Medicine A, Bnai Zion Medical Center, 47 Golomb St, Haifa, Israel. .,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel.
| | - Doron Rimar
- Rheumatology, Bnai Zion Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Nina Boulman
- Rheumatology, Bnai Zion Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Lisa Kaly
- Rheumatology, Bnai Zion Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Michael Rozenbaum
- Rheumatology, Bnai Zion Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Itzhak Rosner
- Rheumatology, Bnai Zion Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Majed Odeh
- Internal Medicine A, Bnai Zion Medical Center, 47 Golomb St, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel
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Maeda Y, Yamamoto K, Yamakawa A, Aini H, Takato T, Chung UI, Ohba S. The H2 blocker famotidine suppresses progression of ossification of the posterior longitudinal ligament in a mouse model. RMD Open 2015; 1:e000068. [PMID: 26509067 PMCID: PMC4612692 DOI: 10.1136/rmdopen-2015-000068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 04/03/2015] [Accepted: 04/24/2015] [Indexed: 12/13/2022] Open
Abstract
Background Ossification of the posterior longitudinal ligament (OPLL) of the spine is a common human myelopathy that leads to spinal cord compression. No disease-modifying drug for OPLL has been identified, whereas surgery and conservative management have been established. Objectives To evaluate the therapeutic potential of the H2 blocker famotidine for ectopic ossification in the cervical spine in an OPLL mouse model. Methods The H2 blocker famotidine was orally administered to Enpp1ttw/ttw mice, a model of OPLL, at either 4 or 15 weeks of age. Radiological and survival rate analyses were performed to assess the effects of famotidine on OPLL-like lesions and mortality in Enpp1ttw/ttw mice. Results Oral administration of famotidine suppressed the progression of OPLL-like ectopic ossification and reduced mortality in Enpp1ttw/ttw mice when administration began at 4 weeks of age, early in the development of ossification. Conclusions This study points to the use of famotidine as a disease-modifying drug for ectopic ossification of spinal soft tissue, including OPLL.
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Affiliation(s)
- Yujiro Maeda
- Department of Sensory and Motor System Medicine, The University of Tokyo Graduate School of Medicine, Tokyo , Japan ; Division of Clinical Biotechnology , The University of Tokyo Graduate School of Medicine , Tokyo , Japan
| | - Kenichi Yamamoto
- Department of Sensory and Motor System Medicine, The University of Tokyo Graduate School of Medicine, Tokyo , Japan ; Division of Clinical Biotechnology , The University of Tokyo Graduate School of Medicine , Tokyo , Japan
| | - Akira Yamakawa
- Division of Clinical Biotechnology , The University of Tokyo Graduate School of Medicine , Tokyo , Japan
| | - Hailati Aini
- Department of Bioengineering , The University of Tokyo Graduate School of Engineering , Tokyo , Japan
| | - Tsuyoshi Takato
- Department of Sensory and Motor System Medicine, The University of Tokyo Graduate School of Medicine, Tokyo , Japan
| | - Ung-Il Chung
- Division of Clinical Biotechnology , The University of Tokyo Graduate School of Medicine , Tokyo , Japan ; Department of Bioengineering , The University of Tokyo Graduate School of Engineering , Tokyo , Japan
| | - Shinsuke Ohba
- Division of Clinical Biotechnology , The University of Tokyo Graduate School of Medicine , Tokyo , Japan ; Department of Bioengineering , The University of Tokyo Graduate School of Engineering , Tokyo , Japan
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Nakajima M, Takahashi A, Tsuji T, Karasugi T, Baba H, Uchida K, Kawabata S, Okawa A, Shindo S, Takeuchi K, Taniguchi Y, Maeda S, Kashii M, Seichi A, Nakajima H, Kawaguchi Y, Fujibayashi S, Takahata M, Tanaka T, Watanabe K, Kida K, Kanchiku T, Ito Z, Mori K, Kaito T, Kobayashi S, Yamada K, Takahashi M, Chiba K, Matsumoto M, Furukawa KI, Kubo M, Toyama Y, Ikegawa S. A genome-wide association study identifies susceptibility loci for ossification of the posterior longitudinal ligament of the spine. Nat Genet 2014; 46:1012-6. [PMID: 25064007 DOI: 10.1038/ng.3045] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 06/30/2014] [Indexed: 12/15/2022]
Abstract
Ossification of the posterior longitudinal ligament of the spine (OPLL) is a common spinal disorder among the elderly that causes myelopathy and radiculopathy. To identify genetic factors for OPLL, we performed a genome-wide association study (GWAS) in ∼8,000 individuals followed by a replication study using an additional ∼7,000 individuals. We identified six susceptibility loci for OPLL: 20p12.3 (rs2423294: P = 1.10 × 10(-13)), 8q23.1 (rs374810: P = 1.88 × 10(-13)), 12p11.22 (rs1979679: P = 4.34 × 10(-12)), 12p12.2 (rs11045000: P = 2.95 × 10(-11)), 8q23.3 (rs13279799: P = 1.28 × 10(-10)) and 6p21.1 (rs927485: P = 9.40 × 10(-9)). Analyses of gene expression in and around the loci suggested that several genes are involved in OPLL etiology through membranous and/or endochondral ossification processes. Our results bring new insight to the etiology of OPLL.
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Affiliation(s)
- Masahiro Nakajima
- 1] Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan. [2]
| | - Atsushi Takahashi
- 1] Laboratory for Statistical Analysis, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan. [2]
| | - Takashi Tsuji
- 1] Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan. [2]
| | - Tatsuki Karasugi
- 1] Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan. [2] Department of Orthopaedic and Neuro-Musculoskeletal Surgery, Faculty of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hisatoshi Baba
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Kenzo Uchida
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | - Shigenori Kawabata
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Atsushi Okawa
- Department of Orthopaedic Surgery, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shigeo Shindo
- Department of Orthopedics, Kudanzaka Hospital, Tokyo, Japan
| | - Kazuhiro Takeuchi
- Department of Orthopaedic Surgery, National Okayama Medical Center, Okayama, Japan
| | - Yuki Taniguchi
- Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shingo Maeda
- Department of Medical Joint Materials, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Masafumi Kashii
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Atsushi Seichi
- Department of Orthopedics, Jichi Medical University, Shimotsuke, Japan
| | - Hideaki Nakajima
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, Japan
| | | | - Shunsuke Fujibayashi
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masahiko Takahata
- Department of Orthopedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Toshihiro Tanaka
- Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kei Watanabe
- Department of Orthopaedic Surgery, Niigata University Medical and Dental General Hospital, Niigata, Japan
| | - Kazunobu Kida
- Department of Orthopaedic Surgery, Kochi Medical School, Kochi, Japan
| | - Tsukasa Kanchiku
- Department of Orthopedic Surgery, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Zenya Ito
- Department of Orthopedics, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kanji Mori
- Department of Orthopaedic Surgery, Shiga University of Medical Science, Otsu, Japan
| | - Takashi Kaito
- Department of Orthopaedic Surgery, National Hospital Organization Osaka Minami Medical Center, Osaka, Japan
| | - Sho Kobayashi
- Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Kei Yamada
- Department of Orthopaedic Surgery, Kurume University School of Medicine, Kurume, Japan
| | - Masahito Takahashi
- Department of Orthopaedic Surgery, Kyorin University School of Medicine, Tokyo, Japan
| | - Kazuhiro Chiba
- 1] Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan. [2]
| | - Morio Matsumoto
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Ken-Ichi Furukawa
- Department of Pharmacology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Michiaki Kubo
- Laboratory for Genotyping Development, Center for Integrative Medical Sciences, RIKEN, Yokohama, Japan
| | - Yoshiaki Toyama
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | | | - Shiro Ikegawa
- Laboratory for Bone and Joint Diseases, Center for Integrative Medical Sciences, RIKEN, Tokyo, Japan
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Association between BH3 interacting domain death agonist (BID) gene polymorphism and ossification of the posterior longitudinal ligament in Korean population. Mol Biol Rep 2014; 41:895-9. [PMID: 24398548 DOI: 10.1007/s11033-013-2933-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 12/20/2013] [Indexed: 10/25/2022]
Abstract
The purpose of this study was to investigate single nucleotide polymorphisms (SNPs) of the BH3 interacting domain death agonist (BID) gene as a risk factor in Korean patients with ossification of the posterior longitudinal ligament (OPLL). To investigate the genetic association, two coding SNPs (rs8190315, Ser10Gly; rs2072392, Asp60Asp) of BID were genotyped in 157 OPLL patients and 209 control subjects. SNPStats, SNPAnalyzer Pro, Helixtree, and Haploview 4.2 programs were used for association analysis. Multiple logistic regression models (codominant, dominant, and recessive) were calculated for the odds ratios (ORs), 95 % confidence intervals (CIs), and corresponding P values. For multiple testing, Bonferroni correction was performed. After Bonferroni correction, genotype analysis of both rs8190315 and rs2072392 showed association between the OPLL group and the control group in the codominant model (P = 0.042, OR 1.86, 95 % CI 1.10-3.15). A complete linkage disequilibrium block was estimated between the two SNPs. Both of the G allele of rs8190315 and C allele of rs2072392 were strongly associated with an increased risk in the development of OPLL (P = 0.0052, OR 2.66, 95 % CI 1.51-4.68). These results suggest that BID is associated with OPLL, and both the G allele of a missense SNP (rs8190315, Ser10Gly) and C allele of a synonymous SNP (rs2072392, Asp60Asp) are risk factors for the development of OPLL in Korean population.
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Indian hedgehog signaling promotes chondrocyte differentiation in enchondral ossification in human cervical ossification of the posterior longitudinal ligament. Spine (Phila Pa 1976) 2013; 38:E1388-96. [PMID: 23883825 DOI: 10.1097/brs.0b013e3182a40489] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Histological, immunohistochemical, and immunoblot analyses of the expression of Indian hedgehog (Ihh) signaling in human cervical ossification of the posterior longitudinal ligament (OPLL). OBJECTIVE To examine the hypothesis that Ihh signaling in correlation with Sox9 and parathyroid-related peptide hormone (PTHrP) facilitates chondrocyte differentiation in enchondral ossification process in human cervical OPLL. SUMMARY OF BACKGROUND DATA In enchondral ossification, certain transcriptional factors regulate cell differentiation. OPLL is characterized by overexpression of these factors and disturbance of the normal cell differentiation process. Ihh signaling is essential for enchondral ossification, especially in chondrocyte hypertrophy. METHODS Samples of ossified ligaments were harvested from 45 patients who underwent anterior cervical decompressive surgery for symptomatic OPLL, and 6 control samples from patients with cervical spondylotic myelopathy/radiculopathy without OPLL. The harvested sections were stained with hematoxylin-eosin and toluidine blue, examined by transmission electron microscopy, and immunohistochemically stained for Ihh, PTHrP, Sox9, type X, XI collagen, and alkaline phosphatase. Immunoblot analysis was performed in cultured cells derived from the posterior longitudinal ligaments in the vicinity of the ossified plaque and examined for the expression of these factors. RESULTS The ossification front in OPLL contained chondrocytes at various differentiation stages, including proliferating chondrocytes in fibrocartilaginous area, hypertrophic chondrocytes around the calcification front, and apoptotic chondrocytes near the ossified area. Immunoreactivity for Ihh and Sox9 was evident in proliferating chondrocytes and was strongly positive for PTHrP in hypertrophic chondrocytes. Mesenchymal cells with blood vessel formation were positive for Ihh, PTHrP, and Sox9. Cultured cells from OPLL tissues expressed significantly higher levels of Ihh, PTHrP, and Sox9 than those in non-OPLL cells. CONCLUSION Our results indicated that overexpression of Ihh signaling promotes abnormal chondrocyte differentiation in enchondral ossification and enhances bone formation in OPLL.
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Cyclic tensile strain facilitates the ossification of ligamentum flavum through β-catenin signaling pathway: in vitro analysis. Spine (Phila Pa 1976) 2012; 37:E639-46. [PMID: 22158061 DOI: 10.1097/brs.0b013e318242a132] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Histological, immunohistochemical, and real-time reverse transcription-polymerase chain reaction analyses of the expression of cell signaling and transcriptional factors in human ossification of ligamentum flavum (OLF). OBJECTIVE To test the hypothesis that β-catenin plays a role in the ossification of OLF cells in response to cyclic tensile strain. SUMMARY OF BACKGROUND DATA Several studies have investigated the roles of biomechanical and metabolic factors in the development and progression of OLF, based on the importance of genetic and biological factors. The process of ossification includes enchondral ossification, although such pathology remains poorly defined. METHODS Using real-time reverse transcription-polymerase chain reaction, we analyzed the mRNA expression levels of signaling factors known to be involved in the ossification process (β-catenin, Runx2, Sox9, and osteopontin) in cultured OLF cells subjected to cyclic tensile strain. Cyclic tensile strain was produced by Flexercell FX-3000 (Flexercell International, Hillsborough, NC), applied for 0, 6, 12, or 24 hours. The localization of these factors was examined in decalcified paraffin OLF sections by immunohistochemistry. Controlled samples were harvested from nonossified ligamentum flavum of patients who underwent thoracic posterior surgical procedures. RESULTS Under resting conditions (no tensile strain), the mRNA levels of β-catenin, Runx2, Sox9, and osteopontin in cultured OLF cells were significantly higher than in the control non-OLF cells. Application of cyclic tensile strain to OLF cells resulted in significant increases in mRNA expression levels of β-catenin, Runx2, Sox9, and osteopontin at 24 hours. Hypertrophic chondrocytes present around the calcification front were immunopositive for Runx2 and osteopontin. Immunoreactivity of β-catenin and Sox9 was strongly present in premature chondrocytes in the fibrocartilage area. CONCLUSION Our results indicated that cyclic tensile strain applied to OLF cells activated their ossification through a process mediated by the β-catenin signaling pathway.
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Lui PPY, Chan KM. Tendon-derived stem cells (TDSCs): from basic science to potential roles in tendon pathology and tissue engineering applications. Stem Cell Rev Rep 2012; 7:883-97. [PMID: 21611803 DOI: 10.1007/s12015-011-9276-0] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Traditionally, tendons are considered to only contain tenocytes that are responsible for the maintenance, repair and remodeling of tendons. Stem cells, which are termed tendon-derived stem cells (TDSCs), have recently been identified in tendons. This review aims to summarize the current information about the in vitro characteristics of TDSCs, including issues related to TDSC isolation and culture, their cell morphology, immunophenotypes, proliferation and differentiation characteristics and senescence during in vitro passaging. The challenges in studying the functions of these cells are also discussed. The niche where TDSCs resided essentially provides signals that are conducive to the maintenance of definitive stem cell properties of TDSCs. Yet the niche may also induce pathologies by imposing an aberrant function on TDSCs or other targets. The possible niche factors of TDSCs are herein discussed. We presented current evidences supporting the potential pathogenic role of TDSCs in the development of tendinopathy with reference to the recent findings on the altered biological responses of these cells in response to their potential niche factors. The use of resident stem cells may promote engraftment and differentiation of transplanted cells in tendon and tendon-bone junction repair because the tendon milieu is an ideal and familiar environment to the transplanted cells. Evidences are presented to show the potential advantages and results of using TDSCs as a new cell source for tendon and tendon-bone junction repair. Issues pertaining to the use of TDSCs for tissue repair are also discussed.
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Affiliation(s)
- Pauline Po Yee Lui
- Department of Orthopaedics and Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, SAR, China.
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Higher BMP receptor expression and BMP-2-induced osteogenic differentiation in tendon-derived stem cells compared with bone-marrow-derived mesenchymal stem cells. INTERNATIONAL ORTHOPAEDICS 2011; 36:1099-107. [PMID: 22134708 DOI: 10.1007/s00264-011-1417-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 11/06/2011] [Indexed: 01/30/2023]
Abstract
PURPOSE Surgical reattachment of tendon to bone often fails due to regeneration failure of the specialised tendon-bone junction (TBJ). The use of mesenchymal stem cells for TBJ regeneration has been reported with promising results. Tendon-derived stem cells (TDSCs) with high proliferative and multi-lineage differentiation potential have been isolated. As stem cells residing in tendons, TDSCs can be considered a new cell source for TBJ repair. Bone morphogenic protein 2 (BMP-2) is a potent osteogenic factor with roles in normal bone healing and pathological ectopic bone formation in soft tissues. The use of BMP-2 to promote TBJ repair has been well reported. This study aimed to compare TDSCs to the gold standard bone-marrow-derived mesenchymal stem cells (BMSCs) with respect to osteogenic response to BMP-2 in vitro. METHOD The clonogenicity and multi-differentiation potential of TDSCs and BMSCs were identified by colony-forming-unit assay, osteogenic, adipogenic and chondrogenic differentiation assays. Their osteogenic response to BMP-2 in vitro was examined by alkaline phosphatase (ALP) cytochemical staining, ALP activity assay and Alizarin red S staining of calcium nodule formation. Messenger RNA (mRNA) and BMP receptor (types IA, IB and II) protein expression were examined by quantitative real-time reverse-transcriptase polymerase chain reaction (qRT-PCR) and Western blotting. RESULTS Our results showed that both TDSCs and BMSCs exhibited stem cell properties, including clonogenicity and multi-differentiation potential. TDSCs expressed higher mRNA and protein levels of BMP receptors IA, IB and II. They also exhibited higher osteogenic differentiation with and without BMP-2 stimulation compared with BMSCs. CONCLUSIONS TDSCs with/without BMP-2 might be an attractive source for TBJ repair compared with BMSCs.
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Uchida K, Yayama T, Cai HX, Nakajima H, Sugita D, Guerrero AR, Kobayashi S, Yoshida A, Chen KB, Baba H. Ossification process involving the human thoracic ligamentum flavum: role of transcription factors. Arthritis Res Ther 2011; 13:R144. [PMID: 21914169 PMCID: PMC3308072 DOI: 10.1186/ar3458] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Revised: 05/13/2011] [Accepted: 09/13/2011] [Indexed: 12/11/2022] Open
Abstract
INTRODUCTION Ossification of the ligamentum flavum (OLF) of the spine is associated with serious neurologic compromise, but the pathomechanism of this process remains unclear. The objective of this study was to investigate the pathomechanism of the ossification process, including the roles of various transcriptional factors in the ossification of human thoracic ligamentum flavum. METHODS Sections of the thoracic ligamentum flavum were obtained from 31 patients with OLF who underwent posterior thoracic decompression, and from six control patients free of OLF. Cultured ligamentum flavum cells (n = 6, each) were examined with real-time reverse transcription-polymerase chain reaction (RT-PCR) analysis for Sry-type high-mobility group box 9 (Sox9), runt-related transcription factor 2 (Runx2), muscle segment homeobox 2 (Msx2), Osterix, distal-less homeobox 5 (Dlx5), and AP-1. The harvested sections were examined with hematoxylin-eosin, the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) method, and immunohistochemistry for the transcriptional factors. RESULTS Compared with the control, the OLF showed disorganization of the elastic fiber bundles and abundant hypertrophic chondrocytes in the ossification front. TUNEL-positive chondrocytes were found near the ossified plaques. The mRNA expression levels of Sox9, Runx2, Msx2, and AP-1 in cultured cells from the ligamentum flavum of OLF patients were significantly different from those of the control. OLF samples were strongly immunoreactive to Sox9, Runx2, and Msx2 at proliferating chondrocytes in the fibrocartilage area. Hypertrophic chondrocytes were positive for Runx2, Osterix, Dlx5, and AP-1. CONCLUSIONS The ossification process in OLF seems to involve chondrocyte differentiation under the unique expression of transcriptional factors. Accumulation of hypertrophic chondrocytes was evident around the calcified area at the ossification front, and we suggest that the differentiation of these cells seems to be concerned with the ossification process.
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Affiliation(s)
- Kenzo Uchida
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, Fukui University, Eiheiji, Fukui 910-1193, Japan
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Uchida K, Yayama T, Sugita D, Nakajima H, Rodriguez Guerrero A, Watanabe S, Roberts S, Johnson WE, Baba H. Initiation and progression of ossification of the posterior longitudinal ligament of the cervical spine in the hereditary spinal hyperostotic mouse (twy/twy). 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 2011; 21:149-55. [PMID: 21850419 PMCID: PMC3252453 DOI: 10.1007/s00586-011-1971-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Revised: 05/31/2011] [Accepted: 07/31/2011] [Indexed: 11/25/2022]
Abstract
Introduction Ossification of the posterior longitudinal ligament (OPLL) is a significantly critical pathology that can eventually cause serious myelopathy. Ossification commences in the vertebral posterior longitudinal ligaments, and intensifies and spreads with the progression of the disease, resulting in osseous projections and compression of the spinal cord. However, the paucity of histological studies the underlying mechanisms of calcification and ossification processes remain obscure. The pathological process could be simulated in the ossifying process of the ligament in mutant spinal hyperostotic mouse (twy/twy). The aim of this study is to observe that enlargement of the nucleus pulposus followed by herniation, disruption and regenerative proliferation of annulus fibrosus cartilaginous tissues participated in the initiation of ossification of the posterior longitudinal ligament of twy/twy mice. Materials and methods The mutant twy/twy mice (6 to 22-week-old) were used in the present study. The vertebral column was analyzed histologically and immunohistochemically. Results We observed that the enlargement of the nucleus pulposus followed by herniation, disruption and regenerative proliferation of annulus fibrosus cartilaginous tissues participated in the initiation of ossification of posterior longitudinal ligament of twy/twy mice. In this regards, the cells of the protruded hyperplastic annulus fibrosus invaded the longitudinal ligaments and induced neovascularization and metaplasia of primitive mesenchymal cells to osteoblasts in the spinal ligaments of twy/twy mice. Conclusion Since genetic mechanisms could play a role in human OPLL, the age-related enlargement of the nucleus pulposus in the twy/twy mouse may primarily occur as a result of overproduction of mucopolysaccharide matrix material induced by certain genetic abnormalities. Electronic supplementary material The online version of this article (doi:10.1007/s00586-011-1971-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kenzo Uchida
- Department of Orthopaedics and Rehabilitation Medicine, Faculty of Medical Sciences, University of Fukui, Matsuoka Shimoaizuki 23-3, Eiheiji, Fukui, 910-1193, Japan.
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Kudo H, Furukawa KI, Yokoyama T, Ono A, Numasawa T, Wada K, Tanaka S, Asari T, Ueyama K, Motomura S, Toh S. Genetic differences in the osteogenic differentiation potency according to the classification of ossification of the posterior longitudinal ligament of the cervical spine. Spine (Phila Pa 1976) 2011; 36:951-7. [PMID: 21224767 DOI: 10.1097/brs.0b013e3181e9a8a6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN We categorized the four types of ossification of the posterior longitudinal ligament (OPLL) of the cervical spine into two groups. We biochemically investigated the genetic differences in the osteogenic differentiation potency between the two groups. OBJECTIVE To investigate the genetic differences in the osteogenic differentiation potency according to the OPLL classification. SUMMARY OF BACKGROUND DATA Clinical studies on OPLL have revealed that the risk of progression of the ossification area is greatest for continuous and mixed type OPLL. However, until now, these four types of OPLL have been studied as a single condition. METHODS We categorized the four types of OPLL into the OPLL continuous (continuous or mixed type) and OPLL segmental groups (segmental or circumscribed type). Paraspinal ligaments were aseptically obtained from OPLL patients during surgery. The fibroblast-like cells that migrated from the explants were used for experiments. The cells were placed in a 60-mm culture dishes for total ribonucleic acid preparation and 12 well microplates for alkaline phosphatase (ALP) activity staining. After cultures reached confluence, the cells were cultured in osteogenic medium. The messenger ribonucleic acid expression of bone morphogenetic protein-2 (BMP-2), osterix, tumor necrosis factor-α-stimulated gene-6, and ALP was analyzed by quantitative real time-polymerase chain reaction. Osteogenic differentiation of fibroblast-like cells was determined by histochemically detecting ALP production. RESULTS After osteogenic induction, BMP-2 expression increased in the OPLL continuous and segmental groups. Osterix expression increased in the OPLL continuous group only. Tumor necrosis factor-α-stimulated gene-6 expression was suppressed in the OPLL continuous and segmental groups. ALP expression as well as ALP activity staining was higher in the OPLL continuous group than in the OPLL segmental group. CONCLUSION.: The study revealed genetic differences in the osteogenic differentiation potency between the OPLL continuous and segmental groups. We propose to distinguish OPLL continuous group from segmental group in biochemical studies on OPLL.
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Affiliation(s)
- Hitoshi Kudo
- Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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Tanaka S, Kudo H, Asari T, Ono A, Motomura S, Toh S, Furukawa KI. P2Y1 transient overexpression induced mineralization in spinal ligament cells derived from patients with ossification of the posterior longitudinal ligament of the cervical spine. Calcif Tissue Int 2011; 88:263-71. [PMID: 21210088 DOI: 10.1007/s00223-010-9456-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Accepted: 12/12/2010] [Indexed: 12/01/2022]
Abstract
Ossification of the posterior longitudinal ligament of the spine (OPLL) is characterized by ectopic bone formation in the spinal ligaments. We previously reported that P2 purinoceptor Y1 (P2Y1) expression is elevated in the spinal ligament cells of OPLL patients, but the role of P2Y1 in the spinal ligament calcification process is unknown. To verify the hypothesis that P2Y1 expression causes ossification of the spinal ligaments, we forced expression of P2Y1 in spinal ligament cells obtained from OPLL and non-OPLL patients using a cytomegaloviral vector. The expression of mRNA and protein was investigated by quantitative real-time polymerase chain reaction and immunofluorescence staining, respectively. After transfection, bone morphogenetic protein-2 (BMP-2) and Sox9 mRNA expression was significantly increased in spinal ligament cells derived from OPLL patients (4.36- and 6.44-fold, respectively) compared with cells from non-OPLL patients (0.57- and 3.64-fold, respectively) 2 days after P2Y1 transient transfection. Furthermore, a statistically significant correlation was observed between BMP-2 and P2Y1 mRNA expression levels in cells obtained from OPLL patients but not from non-OPLL patients. Immunofluorescence analysis showed that BMP-2 and P2Y1 expression was increased in OPLL patients only, while Sox9 expression was increased in OPLL and non-OPLL patients. MRS2279, a selective P2Y1 antagonist, blocked the upregulation of Sox9 and BMP-2 after forced expression of P2Y1. Furthermore, 4 days after transient transfection of P2Y1, mineralization was observed only in spinal ligament cells from OPLL patients. These results suggest that P2Y1 expression plays an important role in ectopic bone formation in the spinal ligaments of OPLL patients.
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Affiliation(s)
- Sunao Tanaka
- Department of Pharmacology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan
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Is ossification of posterior longitudinal ligament an enthesopathy? INTERNATIONAL ORTHOPAEDICS 2010; 35:1511-6. [PMID: 21104248 DOI: 10.1007/s00264-010-1163-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Revised: 11/02/2010] [Accepted: 11/02/2010] [Indexed: 10/18/2022]
Abstract
The purpose of this study was to investigate the relationship of ossification of posterior longitudinal ligament (OPLL) with enthesis, the site where the posterior longitudinal ligament (PLL) attaches to the vertebral body, by multi-detector CT reconstruction images. Twenty-nine patients with OPLL were studied. According to the plaques' continuity to the vertebral body, OPLL plaques were classified into two categories: "free" and "contiguous". A "broken sign" was defined as a crack between two plaques. The sites where each "contiguous" plaque attached to the vertebral body were then analysed. There were 78 ossified plaques in total, and six were "free". There were eight cases with a "broken sign", including six "free" ones. The site where all 72 "contiguous" plaques attached to the vertebral body included the zone where the PLL enthesis was situated, while other zones were included in only part of the plaques. Our conclusion was that there might be no real "free type" ossified plaques, and OPLL could start from enthesis, which indicated OPLL could be a kind of enthesopathy.
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Uchida K, Nakajima H, Yayama T, Sato R, Kobayashi S, Kokubo Y, Mwaka ES, Baba H. Anterior and posterior decompressive surgery for progressive amyotrophy associated with cervical spondylosis: a retrospective study of 51 patients. J Neurosurg Spine 2009; 11:330-7. [DOI: 10.3171/2009.3.spine08635] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Object
The aims of this study were to review the clinicoradiological findings in patients who underwent decompressive surgery for proximal and distal types of muscle atrophy caused by cervical spondylosis and to discuss the outcome and techniques of surgical intervention.
Methods
Fifty-one patients (43 men and 8 women) with proximal (37, with arm drop) and distal muscle atrophy (14, with wrist drop) underwent cervical decompression (39 anterior decompressions and 12 open-door C3–7 laminoplasties with microsurgical foraminotomy) for muscle weakness in the upper extremities. The clinical course, type of spinal cord compression, abnormal signal intensity on high-resolution MR imaging, and postdecompression improvement in muscle power were reviewed at a mean follow-up of 2.6 years (range 0.8–9.4 years).
Results
The most commonly affected vertebrae were C4–5 and C5–6, and C5–6 and C6–7 in patients with proximal or distal muscle atrophy, respectively; the respective numbers of affected vertebrae were 1.5 and 2.2. Transaxial MR imaging showed medial compression of the spinal cord in 20 patients (in 12 with proximal and 8 with distal muscle atrophy), paramedial compression in 22 (17 and 5 patients, respectively), and foraminal compression in 9 (8 and 1 patient, respectively). Increased signal intensity on MR imaging was observed in 85.0, 22.7, and 11.1% of cases of medial, paramedial, and foraminal compression, respectively. Increased signal intensity at the affected muscle segment level was observed in 52.9, 40.0, and 0% of cases, respectively. Sixty-two percent of patients with proximal muscle atrophy gained 1 or more grades of muscle power on manual muscle testing (MMT), whereas 64.3% with distal muscle atrophy failed to gain even 1 grade of improvement. The recovery of muscle power correlated with disease duration and the percent voltage of Erb point or wrist-stimulated muscle evoked potentials but not with preoperative MMT, longitudinal range of spinal cord compression, signal change on T2-weighted MR imaging, or surgical procedure.
Conclusions
Surgical outcome in patients with distal muscle atrophy was inferior to that in patients with proximal atrophy. The distal type was characterized by a long preoperative period, a greater number of cervical spine misalignments, a narrow spinal canal, and increased signal intensity on T2-weighted MR imaging. It is essential to perform a careful neurological evaluation, including sensory examination of the lower limbs, as well as neuroradiological and neurophysiological assessments to avoid confusion with motor neuron disease and to detect the coexistence of amyotrophic lateral sclerosis, especially when surgical treatment of cervical spondylosis is planned. The results of careful physical examination, MR imaging studies, and electromyography studies should be comprehensively evaluated to ascertain the pathophysiology of the muscle atrophy. It is very important to distinguish the pathophysiology caused by nerve root impingements from anterior horn dysfunction when making decisions about treatment strategy. Surgical treatment—with or without foraminotomy—for amyotrophy in cervical spondylosis requires urgent action with regard to human neuroanatomy and neural innervation of the paralyzed muscles.
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Affiliation(s)
- Kenzo Uchida
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Hideaki Nakajima
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Takafumi Yayama
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Ryuichiro Sato
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Shigeru Kobayashi
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Yasuo Kokubo
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
| | - Erisa S. Mwaka
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
- 2Department of Orthopaedic Surgery, Makerere University Medical School, Kampala, Republic of Uganda
| | - Hisatoshi Baba
- 1Department of Orthopaedics and Rehabilitation Medicine, University of Fukui Faculty of Medical Sciences, Fukui, Japan; and
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High-resolution magnetic resonance imaging and 18FDG-PET findings of the cervical spinal cord before and after decompressive surgery in patients with compressive myelopathy. Spine (Phila Pa 1976) 2009; 34:1185-91. [PMID: 19407675 DOI: 10.1097/brs.0b013e31819e2919] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Evaluation of cervical spinal cord (CSC) of patients with compressive myelopathy by magnetic resonance imaging (MRI) and high-resolution (18F)fluoro-deoxyglucose (18FDG) positron emission tomography (PET). OBJECTIVE To determine changes in morphology, intramedullary signal intensity, and glucose metabolic rate in CSC after decompression, and to assess the utility of 18FDG-PET in evaluation of patients with cervical myelopathy. SUMMARY OF BACKGROUND DATA The significance of CSC enlargement after decompression and signal intensity changes within the cord remain elusive. No data are available on metabolic activity of the compressed CSC. Only a few studies have examined correlation between high-resolution MRI and 18FDG-PET neuroimaging in cervical myelopathy. METHODS We studied 24 patients who underwent cervical decompressive surgery in terms of postoperative neurologic improvement and changes in MRI and 18FDG-PET. Neurologic status was assessed by the Japanese Orthopedic Association scoring system (17-point scale). Signal intensity change in the cord was qualitatively assessed on both T1- and T2-weighted images. The transverse area of the CSC on MRIs and glucose metabolic rate (standardized uptake value [SUV]) from 18FDG-PET were measured digitally. RESULTS Neurologic improvement correlated with preoperative CSC transverse area at maximal compression (P < 0.01) and at follow-up (P < 0.001) and with mean SUV before surgery (P < 0.01) and at follow-up (P < 0.05). Preoperative signal intensity change on MRIs (low intramedullary signal intensity abnormality on T1-weighted image and high intramedullary on T2-weighted image) correlated negatively with neurologic improvement rate (P < 0.05). The transverse area of the CSC was significantly smaller after surgery in patients with preoperative MRI signal intensity changes (P < 0.05). The SUV at follow-up tended to normalize in association with neurologic improvement. CONCLUSION Our results showed that postoperative neurologic improvement in patients with cervical compressive myelopathy correlated with increased transverse area of the spinal cord, signal intensity change on both T1- and T2-weighted image, and the mean SUV.
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Kokubo Y, Uchida K, Kobayashi S, Yayama T, Sato R, Nakajima H, Takamura T, Mwaka E, Orwotho N, Bangirana A, Baba H. Herniated and spondylotic intervertebral discs of the human cervical spine: histological and immunohistological findings in 500 en bloc surgical samples. Laboratory investigation. J Neurosurg Spine 2008; 9:285-95. [PMID: 18928227 DOI: 10.3171/spi/2008/9/9/285] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
OBJECT In this paper the authors' goal was to identify histological and immunohistochemical differences between cervical disc hemrniation and spondylosis. METHODS A total of 500 cervical intervertebral discs were excised from 364 patients: 198 patients with disc herniation and 166 patients with spondylosis. We examined en bloc samples of endplate-ligament-disc complexes. Types of herniation and graded degrees of disc degeneration on MR images were examined histologically and immunohistochemically. RESULTS The herniated discs showed granulation tissue, newly developed blood vessels, and massive infiltration of CD68-positive macrophages, which surrounded the herniated tissue mainly in the ruptured outer layer of the anulus fibrosus. The vascular invasion was most significant in uncontained (extruded)-type herniated discs. Chondrocytes positive for matrix metalloproteinase (MMP)-3, tumor necrosis factor (TNF)-alpha, basic fibroblast growth factor (bFGF), and vascular endothelial growth factor (VEGF) were abundant in both herniated and spondylotic discs. Free nerve fibers, positive for nerve growth factor (NGF), neurofilament 68, growth-associated protein (GAP)-43, and substance P, were strongly apparent in and around the outer layer of uncontained (extruded)-type herniated discs, with enhanced expression of NGF. The authors observed that herniated discs showed more advanced degeneration in the outer layer of the anulus fibrosus around the granulation tissue than spondylotic discs. On the other hand, spondylotic discs showed more advanced degeneration in the cartilaginous endplate and inner layer of the anulus fibrosus than herniated discs. Spondylotic discs also had thicker bony endplates and expressed TNFalpha and MMP-3 more diffusely than herniated discs, especially in the inner layer of the anulus fibrosus. CONCLUSIONS The authors' results indicate that herniated and spondylotic intervertebral discs undergo different degenerative processes. It is likely that TNFa, MMP-3, bFGF, and VEGF expression is upregulated via the herniated mass in the herniated intervertebral discs, but by nutritional impairment in the spondylotic discs. Macrophage accumulation around newly formed blood vessels in the herniated disc tissues seemed to be regulated by MMP-3 and TNFalpha expression, and both herniated and spondylotic discs exhibited marked neoangiogenesis associated with increased bFGF and VEGF expression. Nerve fibers were associated with NGF overexpression in the outer layer of the anulus fibrosus as well as in endothelial cells of the small blood vessels.
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Affiliation(s)
- Yasuo Kokubo
- Department of Orthopaedics and Rehabilitation Medicine, Fukui University Faculty of Medical Sciences, Fukui, Japan.
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