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Jia Y, Huo X, Wu L, Zhang H, Xu W, Leng H. circSNTB2 and CUL4A Induces Dysfunction of Nucleus Pulposus Cells by Competitively Binding miR-665. Biochem Genet 2024; 62:968-986. [PMID: 37507642 DOI: 10.1007/s10528-023-10465-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/18/2023] [Indexed: 07/30/2023]
Abstract
Circular RNA (circRNA) plays important roles in lumbar degenerative diseases. This study aimed to investigate the role of circSNTB2 in regulating the development of lumbar disc herniation (LDH) in vitro and in vivo. The abnormally expressed circSNTB2 in intervertebral disc degeneration (IDD) through bioinformatics analysis was identified, and verified in nucleus pulposus (NP) tissues of patients with LDH. NP cells were treated with TNF-α to mimic the LDH microenvironment. RT-qPCR was applied to determine levels of mRNA and microRNA (miRNA) in clinical samples and cells. We performed CCK-8, EdU, TUNEL and flow cytometric apoptosis assays to evaluate the proliferation and apoptosis of NP cells. The predicted the miRNAs and downstream target genes were verified with the help of luciferase reporter gene and RNA pull-down experiments. Finally, we established an LDH rat model to further verify the role of circSNTB2 in vivo. circSNTB2 was significantly up-regulated in the NP tissues of LDH group and TNF-α -treated NP cells. miR-665 binds to circSNTB2 and cullin 4A (CUL4A) is the downstream target gene of miR-665. Knockdown of circSNTB2 promoted NP cells proliferation and inhibited apoptosis, which was reversed by down-regulation of miR-665. In addition, up-regulated CUL4A reversed the effects of over-expressed miR-665 on proliferation and apoptosis of NP cells. Meanwhile, results of in vivo experiments demonstrated that knocking down circSNTB2 alleviated LDH-induced thermo-mechanical pain and NP injury. In summary, circSNTB2 regulates the proliferation and apoptosis of NP by mediating miR-665 regulation of CUL4A, which provides a reliable idea for targeted therapy of LDH.
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Affiliation(s)
- Yiming Jia
- Department of Spine Surgery, Chifeng Municipal Hospital, Hongshan District, No. 1, Zhaowuda Road, Chifeng City, 024000, Inner Mongolia, China
| | - Xin Huo
- Department of Orthopaedics, Chifeng Second Hospital, Hongshan District, No.1, Changqing Street, Chifeng City, 024000, Inner Mongolia, China
| | - Leilei Wu
- Department of Spine Surgery, Chifeng Municipal Hospital, Hongshan District, No. 1, Zhaowuda Road, Chifeng City, 024000, Inner Mongolia, China
| | - Haibo Zhang
- Department of Spine Surgery, Chifeng Municipal Hospital, Hongshan District, No. 1, Zhaowuda Road, Chifeng City, 024000, Inner Mongolia, China
| | - Wenda Xu
- Department of Spine Surgery, Chifeng Municipal Hospital, Hongshan District, No. 1, Zhaowuda Road, Chifeng City, 024000, Inner Mongolia, China
| | - Hui Leng
- Department of Spine Surgery, Chifeng Municipal Hospital, Hongshan District, No. 1, Zhaowuda Road, Chifeng City, 024000, Inner Mongolia, China.
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2
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Li Y, Zhang H, Zhu D, Yang F, Wang Z, Wei Z, Yang Z, Jia J, Kang X. Notochordal cells: A potential therapeutic option for intervertebral disc degeneration. Cell Prolif 2024; 57:e13541. [PMID: 37697480 PMCID: PMC10849793 DOI: 10.1111/cpr.13541] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 08/08/2023] [Accepted: 08/21/2023] [Indexed: 09/13/2023] Open
Abstract
Intervertebral disc degeneration (IDD) is a prevalent musculoskeletal degenerative disorder worldwide, and ~40% of chronic low back pain cases are associated with IDD. Although the pathogenesis of IDD remains unclear, the reduction in nucleus pulposus cells (NPCs) and degradation of the extracellular matrix (ECM) are critical factors contributing to IDD. Notochordal cells (NCs), derived from the notochord, which rapidly degrades after birth and is eventually replaced by NPCs, play a crucial role in maintaining ECM homeostasis and preventing NPCs apoptosis. Current treatments for IDD only provide symptomatic relief, while lacking the ability to inhibit or reverse its progression. However, NCs and their secretions possess anti-inflammatory properties and promote NPCs proliferation, leading to ECM formation. Therefore, in recent years, NCs therapy targeting the underlying cause of IDD has emerged as a novel treatment strategy. This article provides a comprehensive review of the latest research progress on NCs for IDD, covering their biological characteristics, specific markers, possible mechanisms involved in IDD and therapeutic effects. It also highlights significant future directions in this field to facilitate further exploration of the pathogenesis of IDD and the development of new therapies based on NCs strategies.
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Affiliation(s)
- Yanhu Li
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Haijun Zhang
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
- The Second People's Hospital of Gansu ProvinceLanzhouPeople's Republic of China
| | - Daxue Zhu
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Fengguang Yang
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Zhaoheng Wang
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Ziyan Wei
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Zhili Yang
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Jingwen Jia
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
| | - Xuewen Kang
- Lanzhou University Second HospitalLanzhouPeople's Republic of China
- Orthopaedics Key Laboratory of Gansu ProvinceLanzhouPeople's Republic of China
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3
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Wang D, Shang Q, Mao J, Gao C, Wang J, Wang D, Wang H, Jia H, Peng P, Du M, Luo Z, Yang L. Phosphorylation of KRT8 (keratin 8) by excessive mechanical load-activated PKN (protein kinase N) impairs autophagosome initiation and contributes to disc degeneration. Autophagy 2023; 19:2485-2503. [PMID: 36897022 PMCID: PMC10392755 DOI: 10.1080/15548627.2023.2186099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 02/23/2023] [Accepted: 02/25/2023] [Indexed: 03/11/2023] Open
Abstract
Excessive mechanical load (overloading) is a well-documented pathogenetic factor for many mechano stress-induced pathologies, i.e. intervertebral disc degeneration (IDD). Under overloading, the balance between anabolism and catabolism within nucleus pulposus (NP) cells are badly thrown off, and NP cells undergo apoptosis. However, little is known about how the overloading is transduced to the NP cells and contributes to disc degeneration. The current study shows that conditional knockout of Krt8 (keratin 8) within NP aggravates load-induced IDD in vivo, and overexpression of Krt8 endows NP cells greater resistance to overloading-induced apoptosis and degeneration in vitro. Discovery-driven experiments shows that phosphorylation of KRT8 on Ser43 by overloading activated RHOA-PKN (protein kinase N) impedes trafficking of Golgi resident small GTPase RAB33B, suppresses the autophagosome initiation and contributes to IDD. Overexpression of Krt8 and knockdown of Pkn1 and Pkn2, at an early stage of IDD, ameliorates disc degeneration; yet only knockdown of Pkn1 and Pkn2, when treated at late stage of IDD, shows a therapeutic effect. This study validates a protective role of Krt8 during overloading-induced IDD and demonstrates that targeting overloading activation of PKNs could be a novel and effective approach to mechano stress-induced pathologies with a wider window of therapeutic opportunity.Abbreviations: AAV: adeno-associated virus; AF: anulus fibrosus; ANOVA: analysis of variance; ATG: autophagy related; BSA: bovine serum albumin; cDNA: complementary deoxyribonucleic acid; CEP: cartilaginous endplates; CHX: cycloheximide; cKO: conditional knockout; Cor: coronal plane; CT: computed tomography; Cy: coccygeal vertebra; D: aspartic acid; DEG: differentially expressed gene; DHI: disc height index; DIBA: dot immunobinding assay; dUTP: 2'-deoxyuridine 5'-triphosphate; ECM: extracellular matrix; EDTA: ethylene diamine tetraacetic acid; ER: endoplasmic reticulum; FBS: fetal bovine serum; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; GPS: group-based prediction system; GSEA: gene set enrichment analysis; GTP: guanosine triphosphate; HE: hematoxylin-eosin; HRP: horseradish peroxidase; IDD: intervertebral disc degeneration; IF: immunofluorescence staining; IL1: interleukin 1; IVD: intervertebral disc; KEGG: Kyoto encyclopedia of genes and genomes; KRT8: keratin 8; KD: knockdown; KO: knockout; L: lumbar vertebra; LBP: low back pain; LC/MS: liquid chromatograph mass spectrometer; LSI: mouse lumbar instability model; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MMP3: matrix metallopeptidase 3; MRI: nuclear magnetic resonance imaging; NC: negative control; NP: nucleus pulposus; PBS: phosphate-buffered saline; PE: p-phycoerythrin; PFA: paraformaldehyde; PI: propidium iodide; PKN: protein kinase N; OE: overexpression; PTM: post translational modification; PVDF: polyvinylidene fluoride; qPCR: quantitative reverse-transcriptase polymerase chain reaction; RHOA: ras homolog family member A; RIPA: radio immunoprecipitation assay; RNA: ribonucleic acid; ROS: reactive oxygen species; RT: room temperature; TCM: rat tail compression-induced IDD model; TCS: mouse tail suturing compressive model; S: serine; Sag: sagittal plane; SD rats: Sprague-Dawley rats; shRNA: short hairpin RNA; siRNA: small interfering RNA; SOFG: safranin O-fast green; SQSTM1: sequestosome 1; TUNEL: terminal deoxynucleotidyl transferase dUTP nick end labeling; VG/ml: viral genomes per milliliter; WCL: whole cell lysate.
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Affiliation(s)
- Di Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Qiliang Shang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Jianxin Mao
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Chu Gao
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- Medical Research Institute, Northwestern Polytechnical University, Xi’an, People’s Republic of China
| | - Jie Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Dong Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Han Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Haoruo Jia
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Pandi Peng
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- Medical Research Institute, Northwestern Polytechnical University, Xi’an, People’s Republic of China
| | - Mu Du
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
| | - Zhuojing Luo
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- Medical Research Institute, Northwestern Polytechnical University, Xi’an, People’s Republic of China
| | - Liu Yang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China
- Medical Research Institute, Northwestern Polytechnical University, Xi’an, People’s Republic of China
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4
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Transcriptome profile in the skeletal muscle of cattle progeny as a function of maternal protein supplementation during mid-gestation. Livest Sci 2022. [DOI: 10.1016/j.livsci.2022.104995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Wan ZY, Shan H, Liu TF, Song F, Zhang J, Liu ZH, Ma KL, Wang HQ. Emerging Issues Questioning the Current Treatment Strategies for Lumbar Disc Herniation. Front Surg 2022; 9:814531. [PMID: 35419406 PMCID: PMC8999845 DOI: 10.3389/fsurg.2022.814531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 03/04/2022] [Indexed: 11/26/2022] Open
Abstract
Lumbar disc herniation is among the common phenotypes of degenerative lumbar spine diseases, significantly affecting patients' quality of life. The practice pattern is diverse. Choosing conservative measures or surgical treatments is still controversial in some areas. For those who have failed conservative treatment, surgery with or without instrumentation is recommended, causing significant expenditures and frustrating complications, that should not be ignored. In the article, we performed a literature review and summarized the evidence by subheadings to unravel the cons of surgical intervention for lumbar disc herniation. There are tetrad critical issues about surgical treatment of lumbar disc herniation, i.e., favorable natural history, insufficient evidence in a recommendation of fusion surgery for patients, metallosis, and implant removal. Firstly, accumulating evidence reveals immune privilege and auto-immunity hallmarks of human lumbar discs within the closed niche. Progenitor cells within human discs further expand the capacity with the endogenous repair. Clinical watchful follow-up studies with repeated diagnostic imaging reveal spontaneous resolution for lumbar disc herniation, even calcified tissues. Secondly, emerging evidence indicates long-term complications of lumbar fusion, such as adjacent segment disease, pseudarthrosis, implant failure, and sagittal spinal imbalance, which get increasing attention. Thirdly, systemic and local reactions (metallosis) for metal instrumentation have been noted with long-term health concerns and toxicity. Fourthly, the indications and timing for spinal implant removal have not reached a consensus. Other challenging issues include postoperative lumbar stiffness. The review provided evidence from a negative perspective for surgeons and patients who attempt to choose surgical treatment. Collectively, the emerging underlying evidence questions the benefits of traditional surgery for patients with lumbar disc herniation. Therefore, the long-term effects of surgery should be closely observed. Surgical decisions should be made prudently for each patient.
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Affiliation(s)
- Zhong Y. Wan
- Department of Orthopedics, The Seventh Medical Center of General Hospital of People's Liberation Army (PLA), Beijing, China
| | - Hua Shan
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Tang F. Liu
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Fang Song
- Department of Stomatology, The Specialty Medical Center Rocket Force of People's Liberation Army (PLA), Beijing, China
| | - Jun Zhang
- Department of Orthopedics, Baoji Central Hospital, Baoji, China
| | - Zhi H. Liu
- Department of Cardiac Surgery, Xijing Hospital, Air Force Medical University, Xi'an, China
| | - Kun L. Ma
- Department of Orthopedics, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Hai Q. Wang
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
- *Correspondence: Hai Q. Wang ;
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6
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Zhang H, Yao S, Zhang Z, Zhou C, Fu F, Bian Y, Luo H, Li Y, Yan S, Ge Y, Chen Y, Zhan K, Ge Y, Chen Z, Yue M, Li X, Du W, Jin H, Tong P, Ruan H, Wu C. Network Pharmacology and Experimental Validation to Reveal the Pharmacological Mechanisms of Liuwei Dihuang Decoction Against Intervertebral Disc Degeneration. Drug Des Devel Ther 2021; 15:4911-4924. [PMID: 34880601 PMCID: PMC8648103 DOI: 10.2147/dddt.s338439] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 11/19/2021] [Indexed: 12/20/2022] Open
Abstract
Purpose To explore the pharmacological mechanisms of Liuwei Dihuang Decoction (LWDHD) against intervertebral disc (IVD) degeneration (IVDD) via network pharmacology analysis combined with experimental validation. Methods First, active ingredients and related targets of LWDHD, as well as related genes of IVDD, were collected from public databases. The protein–protein interaction (PPI) network, Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) functional enrichment analyses were performed to predict the core targets and pathways of LWDHD against IVDD. Secondly, the IVDD model of mice treated with LWDHD was selected to validate the major targets predicted by network pharmacology. Results By searching the intersection of the active ingredient targets and IVDD targets, a total of 110 targets matched the related targets of 30 active ingredients in LWDHD and IVDD were retrieved. PPI network analysis indicated that 17 targets, including Caspase-3, IL-1β, P53, etc., were hub targets. GO and KEGG enrichment analyses showed that the apoptosis pathway was enriched by multiple targets and served as the target for in vivo experimental study validation. The results of animal experiments revealed that LWDHD administration not only restored the decrease in disc height and abnormal degradation of matrix metabolism in IVDD mice but also reversed the high expression of Bax, Caspase-3, IL-1β, P53, and low expression of Bcl-2, thereby inhibiting the apoptosis of IVD tissue and ameliorating the progression of IVDD. Conclusion Using a comprehensive network pharmacology approach, our findings predicted the active ingredients and potential targets of LWDHD intervention for IVDD, and some major target proteins involved in the predictive signaling pathway were validated experimentally, which gave us a new understanding of the pharmacological mechanism of LWDHD in treating IVDD at the comprehensive level.
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Affiliation(s)
- Huihao Zhang
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Sai Yao
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Zhiguo Zhang
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Chengcong Zhou
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Fangda Fu
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Yishan Bian
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Huan Luo
- Department of Pharmacy, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
| | - Yan Li
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Shuxin Yan
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Yuying Ge
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Yuying Chen
- The Fourth Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Kunyu Zhan
- The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Yanzhi Ge
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Zuxiang Chen
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Ming Yue
- Department of Physiology, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Xiaofeng Li
- Department of Orthopedics and Traumatology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Weibin Du
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China.,Research Institute of Orthopedics, The Affiliated JiangNan Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Hongting Jin
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Peijian Tong
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Hongfeng Ruan
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China.,Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Chengliang Wu
- Institute of Orthopaedics and Traumatology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
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7
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Nucleus Pulposus Cell Conditioned Medium Promotes Mesenchymal Stem Cell Differentiation into Nucleus Pulposus-Like Cells under Hypoxic Conditions. Stem Cells Int 2020; 2020:8882549. [PMID: 33424982 PMCID: PMC7773475 DOI: 10.1155/2020/8882549] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/15/2020] [Accepted: 12/03/2020] [Indexed: 12/27/2022] Open
Abstract
Low back pain (LBP) is a major physical and socioeconomic challenge worldwide. Nucleus pulposus (NP) is directly associated with LBP due to intervertebral disc (IVD) degeneration. IVD degeneration is mainly caused by structural and matrix-related changes within the IVD occurring during aging and degeneration. Mesenchymal stem cells (MSCs) can differentiate into multiple mesenchymal lineages under specific stimulatory conditions. This study is aimed at evaluating the effectiveness of the nucleus pulposus cell (NPC) conditioned medium for promoting the expression of MSCs and at confirming the expression of healthy NP phenotypic markers recently recommended by the Spine Research Interest Group. Expression was investigated using quantitative polymerase chain reaction (qPCR) and western blotting under normoxic and hypoxic conditions. qPCR and western blotting demonstrated significant upregulation of NP marker expression in MSCs cultured under hypoxic conditions and treated with the 50% or 100% NPC conditioned medium, compared with those cultured under normoxic conditions. Upregulation was highest in the presence of the 100% NPC conditioned medium compared with the control group (aggrecan, p < 0.01; brachyury, p < 0.05; collagen II, p < 0.001; KRT8, p < 0.01; KRT19, p < 0.001; and Shh, p < 0.01). The expression levels of genes in MSCs treated with the 50% NPC conditioned medium also showed upregulation compared with the control group (collagen II, p < 0.05; KRT8, p < 0.05; and KRT19, p < 0.01). These findings suggested that the NPC conditioned medium stimulated MSC differentiation into an NP-like phenotype with distinct characteristics. The results could inform strategies for IVD regeneration.
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Wang D, He X, Wang D, Peng P, Xu X, Gao B, Zheng C, Wang H, Jia H, Shang Q, Sun Z, Luo Z, Yang L. Quercetin Suppresses Apoptosis and Attenuates Intervertebral Disc Degeneration via the SIRT1-Autophagy Pathway. Front Cell Dev Biol 2020; 8:613006. [PMID: 33363176 PMCID: PMC7758489 DOI: 10.3389/fcell.2020.613006] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/16/2020] [Indexed: 12/31/2022] Open
Abstract
Intervertebral disc degeneration (IDD) has been generally accepted as the major cause of low back pain (LBP), which causes an enormous socioeconomic burden. Previous studies demonstrated that the apoptosis of nucleus pulposus (NP) cells and the dyshomeostasis of extracellular matrix (ECM) contributed to the pathogenesis of IDD, and effective therapies were still lacking. Quercetin, a natural flavonoid possessing a specific effect of autophagy stimulation and SIRT1 activation, showed some protective effect on a series of degenerative diseases. Based on previous studies, we hypothesized that quercetin might have therapeutic effects on IDD by inhibiting the apoptosis of NP cells and dyshomeostasis of ECM via the SIRT1-autophagy pathway. In this study, we revealed that quercetin treatment inhibited the apoptosis of NP cells and ECM degeneration induced by oxidative stress. We also found that quercetin promoted the expression of SIRT1 and autophagy in NP cells in a dose-dependent manner. Autophagy inhibitor 3-methyladenine (3-MA) reversed the protective effect of quercetin on apoptosis and ECM degeneration. Moreover, SIRT1 enzymatic activity inhibitor EX-527, suppressed quercetin-induced autophagy and the protective effect on NP cells, indicating that quercetin protected NP cells against apoptosis and prevented ECM degeneration via SIRT1-autophagy pathway. In vivo, quercetin was also demonstrated to alleviate the progression of IDD in rats. Taken together, our results suggest that quercetin prevents IDD by promoting SIRT1-dependent autophagy, indicating one novel and effective therapeutic method for IDD.
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Affiliation(s)
- Dong Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Xin He
- Department of Medicine Chemistry and Pharmaceutical Analysis, School of Pharmacy, Fourth Military Medical University, Xi'an, China
| | - Di Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Pandi Peng
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Medical Research Institute, Northwestern Polytechnical University, Xi'an, China
| | - Xiaolong Xu
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Bo Gao
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Chao Zheng
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Han Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Haoruo Jia
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Qiliang Shang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Zhen Sun
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Zhuojing Luo
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Medical Research Institute, Northwestern Polytechnical University, Xi'an, China
| | - Liu Yang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China.,Medical Research Institute, Northwestern Polytechnical University, Xi'an, China
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9
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Notochordal-Cell-Derived Exosomes Induced by Compressive Load Inhibit Angiogenesis via the miR-140-5p/Wnt/β-Catenin Axis. MOLECULAR THERAPY. NUCLEIC ACIDS 2020; 22:1092-1106. [PMID: 33294295 PMCID: PMC7691158 DOI: 10.1016/j.omtn.2020.10.021] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 10/13/2020] [Indexed: 12/16/2022]
Abstract
Angiogenesis is a pathological signature of intervertebral disc degeneration (IDD). Accumulating evidence has shown that notochordal cells (NCs) play an essential role in maintaining intervertebral disc development and homeostasis with inhibitive effect on blood vessel in-growth. However, the anti-angiogenesis mechanism of NCs is still unclear. In the current study, we, for the first time, isolated NC-derived exosomes (NC-exos) and showed their increased concentration following compressive load cultures. We further found that NC-exos from 0.5 MPa compressive load cultures (0.5 MPa/NC-exos) inhibit angiogenesis via transferring high expressed microRNA (miR)-140-5p to endothelial cells and regulating the downstream Wnt/β-catenin pathway. Clinical evidence showed that exosomal miR-140-5p expression of the nucleus pulposus is negatively correlated with angiogenesis in IDD. Finally, 0.5 MPa/NC-exos were demonstrated to have a therapeutical impact on the degenerated disc with an anti-angiogenesis effect in an IDD model. Consequently, our present findings provide insights into the anti-angiogenesis mechanism of NC-exos, indicating their therapeutic potential for IDD.
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10
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Wang X, Li D, Wu H, Liu F, Liu F, Zhang Q, Li J. LncRNA TRPC7-AS1 regulates nucleus pulposus cellular senescence and ECM synthesis via competing with HPN for miR-4769-5p binding. Mech Ageing Dev 2020; 190:111293. [PMID: 32585234 DOI: 10.1016/j.mad.2020.111293] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 06/12/2020] [Accepted: 06/18/2020] [Indexed: 12/21/2022]
Abstract
Intervertebral disc (IVD) degeneration (IDD) is identified as an abnormal, cell-mediated, age-dependent and genetics-dependent molecular degeneration process in which NPCs (nucleus pulposus cells) senesce and the balance of ECM (extracellular matrix) synthesis and catabolism is disrupted. Increasing evidence reveals that IDD can be modulated by genetic factors, including non-coding RNAs. In the present study, we downloaded non-coding RNA profiling (GSE56081 and GSE63492) and performed GO annotation and enrichment analysis and association analyses on differentially-expressed genes. LncRNA TRPC7-AS1, miR-4769-5p, and Hepsin (HPN) may form a lncRNA-miRNA-mRNA network that can regulate NPC proliferation, senescence and ECM in IDD. LncRNA TRPC7-AS1 directly targets miR-4769-5p while miR-4769-5p directly targets HPN 3'UTR. miR-4769-5p overexpression inhibited HPN expression, suppressed NPC senescence, promoted NPC viability, and promoted ECM synthesis. The effect of TRPC7-AS1 silence on NPCs was similar as miR-4769-5p overexpression while the effect of HPN overexpression was opposite to miR-4769-5p overexpression. miR-4769-5p suppression or HPN overexpression could significantly attenuate the effect of TRPC7-AS1 silence. LncRNA TRPC7-AS1 relieves miR-4769-5p-induced inhibition on HPN via acting as a ceRNA, thus regulating NPC viability, senescence, and ECM synthesis. In summary, we regard lncRNA-miRNA-mRNA modulation as a new potent target for IDD treatment.
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Affiliation(s)
- Xiaobin Wang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Dan Li
- Department of Geriatrics, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China
| | - Hailin Wu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Fusheng Liu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Fubin Liu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Qianshi Zhang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Jing Li
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, 410011, China; Department of Geriatrics, The Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011, China.
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11
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Saggese T, Thambyah A, Wade K, McGlashan SR. Differential Response of Bovine Mature Nucleus Pulposus and Notochordal Cells to Hydrostatic Pressure and Glucose Restriction. Cartilage 2020; 11:221-233. [PMID: 29808709 PMCID: PMC7097982 DOI: 10.1177/1947603518775795] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE The nucleus pulposus of the human intervertebral disc contains 2 cell types: notochordal (NC) and mature nucleus pulposus (MNP) cells. NC cell loss is associated with disc degeneration and this process may be initiated by mechanical stress and/or nutrient deprivation. This study aimed to investigate the functional responses of NC and MNP cells to hydrostatic pressures and glucose restriction. DESIGN Bovine MNP and NC cells were cultured in 3-dimensional alginate beads under low (0.4-0.8 MPa) and high (1.6-2.4 MPa) dynamic pressure for 24 hours. Cells were cultured in either physiological (5.5 mM) glucose media or glucose-restriction (0.55 mM) media. Finally, the combined effect of glucose restriction and high pressure was examined. RESULTS Cell viability and notochordal phenotypic markers were not significantly altered in response to pressure or glucose restriction. MNP cells responded to low pressure with an increase in glycosaminoglycan (GAG) production while high pressure significantly decreased ACAN gene expression compared with atmospheric controls. NC cells showed no response in matrix gene expression or GAG production with either loading regime. Glucose restriction decreased NC cell TIMP-1 expression but had no effect on MNP cells. The combination of glucose restriction and high pressure only affected MNP cell gene expression, with decreased ACAN, Col2α1, and ADAMTS-5 expression. CONCLUSION This study shows that NC cells are more resistant to acute mechanical stresses than MNP cells and provides a strong rationale for future studies to further our understanding the role of NC cells within the disc, and the effects of long-term exposure to physical stresses.
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Affiliation(s)
- Taryn Saggese
- Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Ashvin Thambyah
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Auckland, Auckland, New Zealand
| | - Kelly Wade
- Department of Chemical and Materials Engineering, Faculty of Engineering, University of Auckland, Auckland, New Zealand
| | - Susan Read McGlashan
- Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
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12
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Gao B, Yin J, Xu X, Fan J, Wang D, Zheng C, Lu W, Cheng P, Sun J, Wang D, Li L, Zhou BO, Yang L, Luo Z. Leptin receptor-expressing cells represent a distinct subpopulation of notochord-derived cells and are essential for disc homoeostasis. J Orthop Translat 2019; 21:91-99. [PMID: 32110508 PMCID: PMC7033302 DOI: 10.1016/j.jot.2019.11.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 11/07/2019] [Accepted: 11/21/2019] [Indexed: 12/31/2022] Open
Abstract
Background/objective Intervertebral disc degeneration (IDD) remains to be an intractable clinical challenge. Although IDD is characterised by loss of notochordal cells (NCs) and dysfunction of nucleus pulposus (NP) cells, little is known about the origin, heterogeneity, fate and maintenance of NCs and NP cells, which further stunts the therapeutic development. Thus, effective tools to spatially and temporally trace specific cell lineage and clarify cell functions in intervertebral disc (IVD) development and homoeostasis are urgently required. Methods In this study, NP specimens were obtained from 20 patients with degenerative disc disease or scoliosis. LepR-Cre mice was crossed with R26R-Tdtomato mice to generate LepR-Cre; R26R-Tdtomato mice, which enabled fate-mapping of NPs from embryo stage to late adult. LMNA G609G/G609G mice was used to determine the effect of premature-aging induced IDD on LepR NPs. X-ray imaging was used to measure lumber disc height of mice. Results Here, we provide the first evidence that the leptin receptor (LepR) is preferentially expressed in NCs at embryonic stages and notochord-derived cells in the postnatal IVD. By using R26R-Tdtomato fluorescent reporter mice, we systematically analysed the specificity of activity and targeting efficiency of leptin receptor-Cre (LepR-Cre) in IVD tissues from the embryonic stage E15.5 to 6-month-old LepR-Cre; Rosa26-Tdtomato (R26R-Tdtomato) mice. Specifically, LepR-Cre targets a distinct subpopulation of notochord-derived cells closely associated with disc homoeostasis. The percentage of LepR-expressing NP cells markedly decreases in the postnatal mouse IVD and, more importantly, in the human IVD with the progression of IDD. Moreover, both spine instability-induced and premature ageing-induced IDD mouse models display the phenotype of IDD with decreased percentage of LepR-expressing NP cells. These findings uncover a potential role of LepR-expressing notochord-derived cells in disc homoeostasis and open the gate for therapeutically targeting the NP cell subpopulation. Conclusion In conclusion, our data prove LepR-Cre mice useful for mapping the fate of specific subpopulations of IVD cells and uncovering the underlying mechanisms of IDD. The translational potential of this article The translation potential of article is that we first identified LepR as a candidate marker of subpopulation of nucleus pulposus (NP) cells and provided LepR as a potential target for the treatment of intervertebral disc degeneration (IDD), which have certain profound significance.
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Affiliation(s)
- Bo Gao
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Jinhua Yin
- Key Laboratory for Space Biosciences and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710032, China
| | - Xiaolong Xu
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Jing Fan
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Di Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Chao Zheng
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Weiguang Lu
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Pengzhen Cheng
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Jicheng Sun
- Department of Aerospace Medical Equipment, School of Aerospace Medicine, Fourth Military Medical University, Xi'an, 710032, China
| | - Dong Wang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Lu Li
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China
| | - Bo O Zhou
- State Key Laboratory of Cell Biology, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences; University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai, 200031, China
| | - Liu Yang
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China.,Medical Research Institute, Northwestern Polytechnical University, Xi'an, 710032, China
| | - Zhuojing Luo
- Institute of Orthopedic Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, China.,Medical Research Institute, Northwestern Polytechnical University, Xi'an, 710032, China
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13
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Chen X, Yu J, Tian H, Shan Z, Liu W, Pan Z, Ren J. Circle RNA hsa_circRNA_100290 serves as a ceRNA for miR-378a to regulate oral squamous cell carcinoma cells growth via Glucose transporter-1 (GLUT1) and glycolysis. J Cell Physiol 2019; 234:19130-19140. [PMID: 31187488 DOI: 10.1002/jcp.28692] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 02/20/2019] [Accepted: 03/21/2019] [Indexed: 12/30/2022]
Abstract
Aerobic glycolysis (the Warburg effect) is a robust metabolic hallmark of most tumors, including oral squamous cell carcinoma (OSCC). Glucose transporter 1 (GLUT1), a major glucose transporter regulating the glucose uptake, is upregulated in OSCC and participated in the cell glycolysis of OSCC. The deregulation and function of noncoding RNAs in cancers have been widely reported. Reportedly, hsa_circular RNA (circRNA)_100290 (circ_SLC30A7) is significantly upregulated (fold change = 6.91, p < 0.0000001) in OSCC. According to online tools prediction (miRWalk, miRanda, and Targetscan), miR-378a could simultaneously target circRNA_100290 and GLUT1. Herein, the expression of circRNA_100290 and GLUT1 remarkably increased in oral tumor tissue specimens and cells. In OSCC cell lines, cell proliferation and glycolysis could be remarkably downregulated by circRNA_100290 silence, which could be rescued by GLUT1 overexpression. Conversely, miR-378a expression could be remarkably inhibited in tumor tissue specimens and cells. The effect of miR-378a overexpression on OSCC cells was similar to those of circRNA_100290 silence. miR-378a directly bound to circRNA_100290 and GLUT1 3'-untranslated region, circRNA_100290 could remarkably relieve miR-378a-induced inhibition on GLUT1 via acting as a competing endogenous RNA (ceRNA). miR-378a inhibition remarkably attenuated the effect of circRNA_100290 silence on cell proliferation and glycolysis in OSCC cell lines. In summary, circRNA_100290 serves as a ceRNA to counteract miR-378a-mediated GLUT1 suppression, thus promoting glycolysis and cell proliferation in OSCC. We provide a reliable experimental basis for understanding the mechanism of cell growth and glycolysis deregulation in OSCC.
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Affiliation(s)
- Xing Chen
- Department of Otorhinolaryngology Head and Neck Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.,Department of Head and Neck Surgery, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Jianjun Yu
- Department of Head and Neck Surgery, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Hao Tian
- Department of Head and Neck Surgery, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Zhenfeng Shan
- Department of Head and Neck Surgery, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Wei Liu
- Department of Otorhinolaryngology Head and Neck Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhen Pan
- Department of Otorhinolaryngology Head and Neck Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jihao Ren
- Department of Otorhinolaryngology Head and Neck Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
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14
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Yang S, Li L, Zhu L, Zhang C, Li Z, Guo Y, Nie Y, Luo Z. Aucubin inhibits IL‐1β‐ or TNF‐α‐induced extracellular matrix degradation in nucleus pulposus cell through blocking the miR‐140‐5p/CREB1 axis. J Cell Physiol 2019; 234:13639-13648. [PMID: 30637726 DOI: 10.1002/jcp.28044] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 12/03/2018] [Indexed: 01/04/2023]
Affiliation(s)
- Shaofeng Yang
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
| | - Linghui Li
- Department of General Orthopedics Wangjing Hospital, China Academy of Chinese Medical Sciences Beijing China
| | - Liguo Zhu
- Department of General Orthopedics Wangjing Hospital, China Academy of Chinese Medical Sciences Beijing China
| | - Chao Zhang
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
| | - Zhaoyong Li
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
| | - Yantao Guo
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
| | - Ying Nie
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
| | - Zhenhua Luo
- Department of Spine The First Hospital of Hunan University of Chinese Medicine Changsha China
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15
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Resutek L, Hsieh AH. The vacuolated morphology of chordoma cells is dependent on cytokeratin intermediate filaments. J Cell Physiol 2018; 234:3458-3468. [DOI: 10.1002/jcp.26809] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 04/30/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Lauren Resutek
- Fischell Department of Bioengineering University of Maryland College Park MD
| | - Adam H. Hsieh
- Fischell Department of Bioengineering University of Maryland College Park MD
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16
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Amelot A, Mazel C. The Intervertebral Disc: Physiology and Pathology of a Brittle Joint. World Neurosurg 2018; 120:265-273. [PMID: 30218798 DOI: 10.1016/j.wneu.2018.09.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 09/02/2018] [Accepted: 09/04/2018] [Indexed: 01/04/2023]
Abstract
BACKGROUND Intervertebral disc (ID) degeneration represents the number one cause for outpatient clinic visits worldwide. Mechanisms are discussed but not yet clearly established. Consequently, back pain management is commonly limited to symptomatic treatment therapies. OBJECTIVES The aim of this review is to evaluate major progress and to unravel the biology and pathology of ID discogenic pain. METHODS The design of this study is a systematic review. A literature search was conducted using Medline, EMBASE, and Google Scholar databases, with no time constraints to locate relevant literature. Significant articles (literature reviews, therapeutic essays, clinical-human-research studies, animal research, and laboratory research) on the intervertebral disc were identified and reviewed. The exclusion criteria were the following: case reports and clinical studies with <10 patients. RESULTS Through a dense review of the literature, the ID is deciphered and described as a fragile anatomic entity. For this systematic review, 132 studies were identified and 79 were retained. The main deterioration and alteration mechanisms that lead to the programmed death of the ID are summarized. In addition, the large variety of biological therapies that override surgical treatment are determined. CONCLUSIONS The degeneration mechanisms of the ID are well defined and decrypted. Although therapies have progressed, none has been effective. The regeneration of the ID remains highly challenging because of the complexity of its natural composition, microstructure, and mechanical properties.
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Affiliation(s)
- Aymeric Amelot
- Department of Neurosurgery, La Pitié Salpétrière Hospital, Paris, France; Sorbonne-University, UPMC, University Paris, Paris, France.
| | - Christian Mazel
- Department of Orthopedic Surgery, L'Institut Mutualiste Montsouris, Paris, France
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17
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Wang X, Wang B, Zou M, Li J, Lü G, Zhang Q, Liu F, Lu C. CircSEMA4B targets miR-431 modulating IL-1β-induced degradative changes in nucleus pulposus cells in intervertebral disc degeneration via Wnt pathway. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3754-3768. [PMID: 30251693 DOI: 10.1016/j.bbadis.2018.08.033] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 08/09/2018] [Accepted: 08/27/2018] [Indexed: 12/11/2022]
Abstract
Intervertebral disc (IVD) degeneration (IDD), characterized by elevated levels of proinflammatory mediators, increased Aggrecan and collagen degradation, and increased degradation of extracellular matrix (ECM), has been widely regarded as a significant contributor to low back pain. Genetics are significant factors contribute to IDD. Based on previous data, circular RNA SEMA4B (circSEMA4B) is down-regulated in IDD specimens; herein, we demonstrated circSEMA4B overexpression could attenuate the effect of IL-1β on nucleus pulposus cell (NPC) proliferation, senescence, and ECM and Aggrecan degradation in IDD via Wnt signaling. Moreover, miR-431, a direct target of circSEMA4B, could bind to the 3'UTR of SFRP1 or GSK-3β, two inhibitory regulators of Wnt signaling, to inhibit their expression thus playing a role similar to the activator of Wnt signaling in NPCs. The effect of circSEMA4B knockdown on NPCs was partially reversed by miR-431 inhibition; circSEMA4B serves as a miR-431 sponge to compete with SFRP1 or GSK-3β for miR-431 binding, thus inhibiting IL-1β-induced degenerative process in NPCs through Wnt signaling. Rescuing circSEMA4B expression in NPCs in IDD might present a potential strategy for IDD improvement.
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Affiliation(s)
- Xiaobin Wang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
| | - Bing Wang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
| | - Mingxiang Zou
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
| | - Jing Li
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China.
| | - Guohua Lü
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China.
| | - Qianshi Zhang
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
| | - Fubin Liu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
| | - Chang Lu
- Department of Spine Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, PR China
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18
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Abstract
Accumulating evidence indicates noncoding RNAs (ncRNAs) fine-tune gene expression with mysterious machinery. We conducted a combination of mRNA, miRNA, circRNA, LncRNA microarray analyses on 10 adults' lumbar discs. Moreover, we performed additional global exploration on RNA interacting machinery in terms of in silico computational pipeline. Here we show the landscape of RNAs in human lumbar discs. In general, the RNA-abundant landscape comprises 14,635 mRNAs (37.93%), 2,059 miRNAs (5.34%), 18,995 LncRNAs (49.23%) and 2,894 (7.5%) circRNAs. Chromosome 1 contributes for RNA transcription at most (10%). Bi-directional transcription contributes evenly for RNA biogenesis, in terms of 5′ to 3′ and 3′ to 5′. Despite the majority of circRNAs are exonic, antisense (1.49%), intergenic (0.035%), intragenic (1.69%), and intronic (6.29%) circRNAs should not be ignored. A single miRNA could interact with a multitude of circRNAs. Notably, CDR1as or ciRS-7 harbors 66 consecutive binding sites for miR-7-5p (previous miR-7), evidencing our pipeline. The majority of binding sites are perfect-matched (78.95%). Collectively, global landscape of RNAs sheds novel insights on RNA interacting mechanisms in human intervertebral disc degeneration.
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19
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Zou F, Ding Z, Jiang J, Lu F, Xia X, Ma X. Confirmation and preliminary analysis of circRNAs potentially involved in human intervertebral disc degeneration. Mol Med Rep 2017; 16:9173-9180. [DOI: 10.3892/mmr.2017.7718] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 08/18/2017] [Indexed: 11/06/2022] Open
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20
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Rodrigues‐Pinto R, Berry A, Piper‐Hanley K, Hanley N, Richardson SM, Hoyland JA. Spatiotemporal analysis of putative notochordal cell markers reveals CD24 and keratins 8, 18, and 19 as notochord-specific markers during early human intervertebral disc development. J Orthop Res 2016; 34:1327-40. [PMID: 26910849 PMCID: PMC5021113 DOI: 10.1002/jor.23205] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 02/17/2016] [Indexed: 02/04/2023]
Abstract
In humans, the nucleus pulposus (NP) is composed of large vacuolated notochordal cells in the fetus but, soon after birth, becomes populated by smaller, chondrocyte-like cells. Although animal studies indicate that notochord-derived cells persist in the adult NP, the ontogeny of the adult human NP cell population is still unclear. As such, identification of unique notochordal markers is required. This study was conducted to determine the spatiotemporal expression of putative human notochordal markers to aid in the elucidation of the ontogeny of adult human NP cells. Human embryos and fetuses (3.5-18 weeks post-conception (WPC)) were microdissected to isolate the spine anlagens (notochord and somites/sclerotome). Morphology of the developing IVD was assessed using hematoxylin and eosin. Expression of keratin (KRT) 8, KRT18, KRT19, CD24, GAL3, CD55, BASP1, CTGF, T, CD90, Tie2, and E-cadherin was assessed using immunohistochemistry. KRT8, KRT18, KRT19 were uniquely expressed by notochordal cells at all spine levels at all stages studied; CD24 was expressed at all stages except 3.5 WPC. While GAL3, CD55, BASP1, CTGF, and T were expressed by notochordal cells at specific stages, they were also co-expressed by sclerotomal cells. CD90, Tie2, and E-cadherin expression was not detectable in developing human spine cells at any stage. This study has identified, for the first time, the consistent expression of KRT8, KRT18, KRT19, and CD24 as human notochord-specific markers during early IVD development. Thus, we propose that these markers can be used to help ascertain the ontogeny of adult human NP cells. © 2016 The Authors. Journal of Orthopaedic Research Published by Wiley Periodicals, Inc. J Orthop Res 34:1327-1340, 2016.
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Affiliation(s)
- Ricardo Rodrigues‐Pinto
- Centre For Tissue Injury and Repair, Institute of Inflammation and Repair, Faculty of Medical and Human SciencesUniversity of ManchesterStopford Building, Oxford RoadManchesterM13 9PTUnited Kingdom
- Department of OrthopaedicsCentro Hospitalar do Porto—Hospital de Santo AntónioLargo Prof. Abel SalazarPorto4099‐001Portugal
| | - Andrew Berry
- Centre for Endocrinology and Diabetes, Institute of Human Development, Faculty of Medical and Human SciencesUniversity of ManchesterAV Hill Building—3rd Floor, Oxford RoadManchesterM13 9PTUnited Kingdom
| | - Karen Piper‐Hanley
- Centre for Endocrinology and Diabetes, Institute of Human Development, Faculty of Medical and Human SciencesUniversity of ManchesterAV Hill Building—3rd Floor, Oxford RoadManchesterM13 9PTUnited Kingdom
| | - Neil Hanley
- Centre for Endocrinology and Diabetes, Institute of Human Development, Faculty of Medical and Human SciencesUniversity of ManchesterAV Hill Building—3rd Floor, Oxford RoadManchesterM13 9PTUnited Kingdom
| | - Stephen M. Richardson
- Centre For Tissue Injury and Repair, Institute of Inflammation and Repair, Faculty of Medical and Human SciencesUniversity of ManchesterStopford Building, Oxford RoadManchesterM13 9PTUnited Kingdom
| | - Judith A. Hoyland
- Centre For Tissue Injury and Repair, Institute of Inflammation and Repair, Faculty of Medical and Human SciencesUniversity of ManchesterStopford Building, Oxford RoadManchesterM13 9PTUnited Kingdom
- NIHR Manchester Musculoskeletal Biomedical Research UnitManchester Academic Health Science CentreManchesterUnited Kingdom
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Stewart DM, Monaco LA, Gregory DE. The aging disc: using an ovine model to examine age-related differences in the biomechanical properties of the intralamellar matrix of single lamellae. 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 2016; 26:259-266. [DOI: 10.1007/s00586-016-4603-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 05/03/2016] [Accepted: 05/03/2016] [Indexed: 01/07/2023]
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22
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Liu XG, Hou HW, Liu YL. Expression levels of IL-17 and TNF-α in degenerated lumbar intervertebral discs and their correlation. Exp Ther Med 2016; 11:2333-2340. [PMID: 27284317 DOI: 10.3892/etm.2016.3250] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 12/03/2015] [Indexed: 01/03/2023] Open
Abstract
The present study aimed to investigate the expression and roles of interleukin (IL)-17 and tumor necrosis factor (TNF)-α in intervertebral disc degeneration (IDD) and to identify the association between the effects of IL-17 and TNF-α in IDD. This may increase understanding of the pathogenic mechanism underlying IDD, and aid the development of alternative therapies. The experimental group consisted of 40 samples of nucleus pulposus tissue obtained from the intervertebral discs (IVDs) of patients with IDD by surgical intervention, and was further divided into an annulus fibrosus disrupted group, comprising 18 patients in which the external annulus was ruptured, and an annulus fibrosus intact group comprising 22 patients. The control group consisted of 20 samples of nucleus pulposus tissue from the IVDs of patients with traumatic lumbar disc fractures. The mRNA and protein expression levels of IL-17 and TNF-α in the 50 tissue samples were detected by semi-quantitative reverse transcription polymerase chain reaction and immunohistochemical staining, respectively, and the results were statistically analyzed. The IL-17 and TNF-α protein and mRNA expression levels in the annulus fibrosus disrupted and annulus fibrosus intact groups were both higher compared with those in the control group. In addition, the expression levels of IL-17 and TNF-α in the annulus fibrosus disrupted group were significantly higher compared with those in the annulus fibrosus intact group (P<0.01). A positive correlation was identified between the mRNA and protein expression levels of IL-17 and TNF-α in the experimental group (r=0.957, P<0.01). IL-17 and TNF-α may therefore be involved in the progression of human IDD, and may have synergistic effects in the development of IDD.
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Affiliation(s)
- Xiao-Gang Liu
- Department of Orthopedics, Weihai Hospital of Qingdao University, Weihai, Shandong 264200, P.R. China
| | - Hong-Wei Hou
- Department of Information, Weihai Hospital of Qingdao University, Weihai, Shandong 264200, P.R. China
| | - Yi-Lin Liu
- Department of Internal Medicine, Worker's Hospital of Xinjiang Dushanzi Mining Area Services Division, Karamay, Xinjiang 833699, P.R. China
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Restović I, Vukojević K, Paladin A, Saraga-Babić M, Bočina I. Immunohistochemical Studies of Cytoskeletal and Extracellular Matrix Components in Dogfish Scyliorhinus canicula L. Notochordal Cells. Anat Rec (Hoboken) 2015; 298:1700-9. [PMID: 26147227 DOI: 10.1002/ar.23195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 05/27/2015] [Accepted: 05/28/2015] [Indexed: 11/09/2022]
Abstract
Immunofluorescence and immunohistochemical techniques were used to define the distribution of cytoskeletal (cytokeratin 8, vimentin) and extracellular matrix components (collagen type I, collagen type II, hyaluronic acid, and aggrecan) and bone morphogenetic proteins 4 and 7 (BMP4 and BMP7) in the notochord of the lesser spotted dogfish Scyliorhinus canicula L. Immunolocalization of hyaluronic acid was observed in the notochord, vertebral centrum, and neural and hemal arches, while positive labeling to aggrecan was observed in the ossified centrum, notochord, and the perichondrium of the hyaline cartilage. Type I collagen was observed in the mineralized cartilage of the vertebral bodies, the notochord, the fibrocartilage of intervertebral disc, and the perichondrium. A positive labeling to type II collagen was observed in the inner part of the cartilaginous vertebral centrum and the notochord, as well as in the neural arch and muscle tissue, but there was no appreciable labeling of the hyaline cartilage. The presence of both BMP4 and BMP7 was seen in the mineralized vertebral centrum, notochordal cells, and neural arch. The notochordal cells expressed both cytokeratin 8 and vimentin, but predominantly vimentin. Hyaluronic acid, collagen type I, and collagen type II expression confirmed the presence of a mixture of notochordal and fibrocartilaginous tissue in the intervertebral disc, while BMPs confirmed the presence of an ossification in the cartilaginous skeleton of the spotted dogfish.
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Affiliation(s)
- Ivana Restović
- Faculty of Philosophy, University of Split, Teslina 12, 21 000 Split, Croatia
| | - Katarina Vukojević
- School of Medicine, University of Split, Šoltanska 2, 21 000 Split, Croatia
| | - Antonela Paladin
- Faculty of Science, University of Split, Teslina 12, 21 000 Split, Croatia
| | - Mirna Saraga-Babić
- School of Medicine, University of Split, Šoltanska 2, 21 000 Split, Croatia
| | - Ivana Bočina
- Faculty of Science, University of Split, Teslina 12, 21 000 Split, Croatia
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Chan WCW, Au TYK, Tam V, Cheah KSE, Chan D. Coming together is a beginning: the making of an intervertebral disc. ACTA ACUST UNITED AC 2015; 102:83-100. [PMID: 24677725 DOI: 10.1002/bdrc.21061] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Accepted: 02/27/2014] [Indexed: 01/07/2023]
Abstract
The intervertebral disc (IVD) is a complex fibrocartilaginous structure located between the vertebral bodies that allows for movement and acts as a shock absorber in our spine for daily activities. It is composed of three components: the nucleus pulposus (NP), annulus fibrosus, and cartilaginous endplate. The characteristics of these cells are different, as they produce specific extracellular matrix (ECM) for tissue function and the niche in supporting the differentiation status of the cells in the IVD. Furthermore, cell heterogeneities exist in each compartment. The cells and the supporting ECM change as we age, leading to degenerative outcomes that often lead to pathological symptoms such as back pain and sciatica. There are speculations as to the potential of cell therapy or the use of tissue engineering as treatments. However, the nature of the cells present in the IVD that support tissue function is not clear. This review looks at the origin of cells in the making of an IVD, from the earliest stages of embryogenesis in the formation of the notochord, and its role as a signaling center, guiding the formation of spine, and in its journey to become the NP at the center of the IVD. While our current understanding of the molecular signatures of IVD cells is still limited, the field is moving fast and the potential is enormous as we begin to understand the progenitor and differentiated cells present, their molecular signatures, and signals that we could harness in directing the appropriate in vitro and in vivo cellular responses in our quest to regain or maintain a healthy IVD as we age.
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Affiliation(s)
- Wilson C W Chan
- Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
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25
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Sun Z, Luo B, Liu ZH, Samartzis D, Liu Z, Gao B, Huang L, Luo ZJ. Adipose-derived stromal cells protect intervertebral disc cells in compression: implications for stem cell regenerative disc therapy. Int J Biol Sci 2015; 11:133-43. [PMID: 25561896 PMCID: PMC4279089 DOI: 10.7150/ijbs.10598] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 11/19/2014] [Indexed: 01/03/2023] Open
Abstract
Introduction: Abnormal biomechanics plays a role in intervertebral disc degeneration. Adipose-derived stromal cells (ADSCs) have been implicated in disc integrity; however, their role in the setting of mechanical stimuli upon the disc's nucleus pulposus (NP) remains unknown. As such, the present study aimed to evaluate the influence of ADSCs upon NP cells in compressive load culture. Methods: Human NP cells were cultured in compressive load at 3.0MPa for 48 hours with or without ADSCs co-culture (the ratio was 50:50). We used flow cytometry, live/dead staining and scanning electron microscopy (SEM) to evaluate cell death, and determined the expression of specific apoptotic pathways by characterizing the expression of activated caspases-3, -8 and -9. We further used real-time (RT-) PCR and immunostaining to determine the expression of the extracellular matrix (ECM), mediators of matrix degradation (e.g. MMPs, TIMPs and ADAMTSs), pro-inflammatory factors and NP cell phenotype markers. Results: ADSCs inhibited human NP cell apoptosis via suppression of activated caspase-9 and caspase-3. Furthermore, ADSCs protected NP cells from the degradative effects of compressive load by significantly up-regulating the expression of ECM genes (SOX9, COL2A1 and ACAN), tissue inhibitors of metalloproteinases (TIMPs) genes (TIMP-1 and TIMP-2) and cytokeratin 8 (CK8) protein expression. Alternatively, ADSCs showed protective effect by inhibiting compressive load mediated increase of matrix metalloproteinases (MMPs; MMP-3 and MMP-13), disintegrin and metalloproteinase with thrombospondin motifs (ADAMTSs; ADAMTS-1 and 5), and pro-inflammatory factors (IL-1beta, IL-6, TGF-beta1 and TNF-alpha). Conclusions: Our study is the first in vitro study assessing the impact of ADSCs on NP cells in an un-physiological mechanical stimulation culture environment. Our study noted that ADSCs protect compressive load induced NP cell death and degradation by inhibition of activated caspase-9 and -3 activity; regulating ECM and modulator genes, suppressing pro-inflammatory factors and preserving CK8. Consequently, the protective impact of ADSCs found in this study provides an essential understanding and expands our knowledge as to the utility of ADSCs therapy for intervertebral disc regeneration.
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Affiliation(s)
- Zhen Sun
- 1. Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, West Changle Road, Xi'an, 710032, China
| | - Beier Luo
- 2. Department of Orthopedics, Changhai Hospital, The Second Military Medical University, Shanghai, 200433, China
| | - Zhi-Heng Liu
- 3. Department of Orthopedics, Air Force Hospital, Youyi Road 269, Xi'an, China
| | - Dino Samartzis
- 4. Department of Orthopaedics and Traumatology, University of Hong Kong, Pokfulam, Hong Kong, SAR, China
| | - Zhongyang Liu
- 1. Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, West Changle Road, Xi'an, 710032, China
| | - Bo Gao
- 1. Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, West Changle Road, Xi'an, 710032, China
| | - Liangliang Huang
- 1. Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, West Changle Road, Xi'an, 710032, China
| | - Zhuo-Jing Luo
- 1. Department of Orthopedics, Xijing Hospital, Fourth Military Medical University, West Changle Road, Xi'an, 710032, China
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Gantenbein B, Calandriello E, Wuertz-Kozak K, Benneker LM, Keel MJB, Chan SCW. Activation of intervertebral disc cells by co-culture with notochordal cells, conditioned medium and hypoxia. BMC Musculoskelet Disord 2014; 15:422. [PMID: 25496082 PMCID: PMC4295479 DOI: 10.1186/1471-2474-15-422] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 12/01/2014] [Indexed: 12/14/2022] Open
Abstract
Background Notochordal cells (NC) remain in the focus of research for regenerative therapy for the degenerated intervertebral disc (IVD) due to their progenitor status. Recent findings suggested their regenerative action on more mature disc cells, presumably by the secretion of specific factors, which has been described as notochordal cell conditioned medium (NCCM). The aim of this study was to determine NC culture conditions (2D/3D, fetal calf serum, oxygen level) that lead to significant IVD cell activation in an indirect co-culture system under normoxia and hypoxia (2% oxygen). Methods Porcine NC was kept in 2D monolayer and in 3D alginate bead culture to identify a suitable culture system for these cells. To test stimulating effects of NC, co-cultures of NC and bovine derived coccygeal IVD cells were conducted in a 1:1 ratio with no direct cell contact between NC and bovine nucleus pulposus cell (NPC) or annulus fibrosus cells (AFC) in 3D alginate beads under normoxia and hypoxia (2%) for 7 and 14 days. As a positive control, NPC and AFC were stimulated with NC-derived conditioned medium (NCCM). Cell activity, glycosaminoglycan (GAG) content, DNA content and relative gene expression was measured. Mass spectrometry analysis of the NCCM was conducted. Results We provide evidence by flow cytometry that monolayer culture is not favorable for NC culture with respect to maintaining NC phenotype. In 3D alginate culture, NC activated NPC either in indirect co-culture or by addition of NCCM as indicated by the gene expression ratio of aggrecan/collagen type 2. This effect was strongest with 10% fetal calf serum and under hypoxia. Conversely, AFC seemed unresponsive to co-culture with pNC or to the NCCM. Further, the results showed that hypoxia led to decelerated metabolic activity, but did not lead to a significant change in the GAG/DNA ratio. Mass spectrometry identified connective tissue growth factor (CTGF, syn. CCN2) in the NCCM. Conclusions Our results confirm the requirement to culture NC in 3D to best maintain their phenotype, preferentially in hypoxia and with the supplementation of FCS in the culture media. Despite these advancements, the ideal culture condition remains to be identified. Electronic supplementary material The online version of this article (doi:10.1186/1471-2474-15-422) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Benjamin Gantenbein
- Tissue & Organ Mechanobiology, Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland.
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27
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Saggese T, Redey P, McGlashan SR. Same-species phenotypic comparison of notochordal and mature nucleus pulposus cells. 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 2014; 24:1976-85. [PMID: 25476137 DOI: 10.1007/s00586-014-3697-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 11/19/2014] [Accepted: 11/19/2014] [Indexed: 12/27/2022]
Abstract
PURPOSE The ratio of notochordal (NC) cells to mature nucleus pulposus (MNP) cells in the nucleus pulposus varies with species, age and health. Studies suggest that loss of NC cells is a key component of intervertebral disc degeneration. However, few studies have examined the phenotypes of these two cell populations. Therefore, this study aimed to isolate NC and MNP cells from the same intervertebral disc and study phenotypic differences in extracellular matrix production and cell morphology in 3D culture over 7 days. METHODS Sequential mechanical dissociation and enzymatic digestion were used to isolate NC cell clusters and single MNP cells from bovine caudal discs. Cells were cultured in alginate beads and subsequently analysed for viability, cytokeratin-8 expression, GAG production and extracellular matrix gene expression. RESULTS Mechanical dissociation allowed NC cells to be extracted as intact cell clusters. NC cells represented 8% of the NP cell population and expressed both cytokeratin-8 and vimentin. MNP cells expressed vimentin, only. Both cells types were viable for 7 days. In addition to morphological differences, NC cells produced up to 30 times more total proteoglycan than MNP cells. NC cells had significantly higher aggrecan and brachyury expression. CONCLUSIONS NC and MNP cells can be isolated from the same bovine disc and maintain their distinct phenotypes in 3D culture.
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Affiliation(s)
- Taryn Saggese
- Department of Anatomy with Radiology, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, 1021, New Zealand
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28
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Turner S, Balain B, Caterson B, Morgan C, Roberts S. Viability, growth kinetics and stem cell markers of single and clustered cells in human intervertebral discs: implications for regenerative therapies. 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 2014; 23:2462-72. [PMID: 25095758 DOI: 10.1007/s00586-014-3500-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 07/28/2014] [Accepted: 07/29/2014] [Indexed: 12/21/2022]
Abstract
PURPOSE There is much interest in the development of a cellular therapy for the repair or regeneration of degenerate intervertebral discs (IVDs) utilising autologous cells, with some trials already underway. Clusters of cells are commonly found in degenerate IVDs and are formed via cell proliferation, possibly as a repair response. We investigated whether these clusters may be more suitable as a source of cells for biological repair than the single cells in the IVD. METHODS Discs were obtained at surgery from 95 patients and used to assess the cell viability, growth kinetics and stem or progenitor cell markers in both the single and clustered cell populations. RESULTS Sixty-nine percent (±15) of cells in disc tissue were viable. The clustered cell population consistently proliferated more slowly in monolayer than single cells, although this difference was only significant at P0-1 and P3-4. Both populations exhibited progenitor or notochordal cell markers [chondroitin sulphate epitopes (3B3(-), 7D4, 4C3 and 6C3), Notch-1, cytokeratin 8 and 19] via immunohistochemical examination; stem cell markers assessed with flow cytometry (CD73, 90 and 105 positivity) were similar to those seen on bone marrow-derived mesenchymal stem cells. CONCLUSIONS These results confirm those of previous studies indicating that progenitor or stem cells reside in adult human intervertebral discs. However, although the cell clusters have arisen via proliferation, there appear to be no greater incidence of these progenitor cells within clusters compared to single cells. Rather, since they proliferate more slowly in vitro than the single cell population, it may be beneficial to avoid the use of clustered cells when sourcing autologous cells for regenerative therapies.
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Affiliation(s)
- Sarah Turner
- Spinal Studies, TORCH Building, Robert Jones and Agnes Hunt Orthopaedic Hospital NHS Foundation Trust, Oswestry, Shropshire, SY10 7AG, UK,
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29
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Wang HQ, Samartzis D. Clarifying the nomenclature of intervertebral disc degeneration and displacement: from bench to bedside. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2014; 7:1293-1298. [PMID: 24817926 PMCID: PMC4014210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 03/10/2014] [Indexed: 06/03/2023]
Abstract
As a significant determinant of low back pain, intervertebral disc degeneration (IDD) has attracted more and more attention of both investigators and physicians. Disc herniation, termed as intervertebral disc displacement, is amongst the most prevalent spinal diseases closely linked with IDD. Due to the same origins and similar pathophysiology, the ambiguity regarding the similarity and difference of IDD and intervertebral disc displacement thus remains. The aim of this study was to clarify the nomenclature of IDD and disc herniation in terms of molecular etiology, pathophysiology, nature history and clinical outcomes. Collectively, IDD is a type of multifaceted, progressive spinal disease with or without clinical symptoms as back pain, characterized by extracellular matrix and the integrity of NP and AF lost, fissures formation. Disc herniation (termed as intervertebral disc displacement) is a type of spinal disease based on IDD or not, with local pain and/or sciatica due to mechanical compression and autoimmune cascades upon the corresponding nerve roots. Clarifying the nomenclature of intervertebral disc degeneration and displacement has important implications both for investigators and for physicians.
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Affiliation(s)
- Hai-Qiang Wang
- Department of Orthopaedics, Xijing Hospital, Fourth Military Medical UniversityXi’an, China
| | - Dino Samartzis
- Department of Orthopaedics and Traumatology, University of Hong KongPokfulam, Hong Kong, China
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CK8 phosphorylation induced by compressive loads underlies the downregulation of CK8 in human disc degeneration by activating protein kinase C. J Transl Med 2013; 93:1323-30. [PMID: 24166186 DOI: 10.1038/labinvest.2013.122] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 08/21/2013] [Accepted: 09/23/2013] [Indexed: 12/23/2022] Open
Abstract
Cytokeratin 8 (CK8) is a member of the cytokeratins family with multiple functions on the basis of its unique structural hallmark. The aberrant expression of CK8 and its phosphorylation are pertinent with various diseases. We have previously shown that CK8 exists in normal human nucleus pulposus (NP) cells and decreases as the intervertebral disc degenerates. However, the underlying molecular regulatory machinery of CK8 in intervertebral disc degeneration (IDD) has not been clarified. Here, we collected NP samples from patients with idiopathic scoliosis as control and IDD as degenerate groups. We found that CK8 expression decreased in IDD with an increased phosphorylation in degenerate NP cells. Moreover, NP cells were cultured under different compressive load schemes for diverse time duration. We found that compressive loads resulted in phosphorylation and disassembly of CK8 in a time-dependent and degree-dependent manner in vitro. The activation of protein kinase C was a significant molecular factor contributing to this phenomenon. Taken together, this study is the first to address the molecular mechanisms of CK8 downregulation in NP cells. Importantly, our findings provide clues regarding a molecular link between compressive loads and CK8 alterations, which shed a novel light on the etiology of IDD.
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Sun MZ, Dang SS, Wang WJ, Jia XL, Zhai S, Zhang X, Li M, Li YP, Xun M. Cytokeratin 8 is increased in hepatitis C virus cells and its ectopic expression induces apoptosis of SMMC7721 cells. World J Gastroenterol 2013; 19:6178-6187. [PMID: 24115814 PMCID: PMC3787347 DOI: 10.3748/wjg.v19.i37.6178] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Revised: 08/10/2013] [Accepted: 08/17/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate cytokeratin 8 (CK8) overexpression during hepatitis C virus (HCV) infection and its pathogenesis, and the effect of ectopic CK8 expression on hepatoma cell lines.
METHODS: We successfully established an in vitro HCV cell culture system (HCVcc) to investigate the different expression profiles of CK8 in Huh-7-HCV and Huh-7.5-HCV cells. The expression of CK8 at the mRNA level was determined by real-time polymerase chain reaction (RT-PCR). The expression of CK8 at the protein level was evaluated by Western blotting. We then constructed a eukaryotic expression combination vector containing the coding sequence of human full length CK8 gene. CK8 cDNA was amplified by reverse transcription-PCR and inserted into pEGFP-C1 and the positive clone pEGFP-CK8 was obtained. After confirming the sequence, the recombinant plasmid was transfected into SMMC7721 cells with lipofectamine2000 and CK8 expression was detected using inverted fluorescence microscopy, RT-PCR and Western blotting. Besides, we identified biological function of CK8 on SMMC7721 cells, including cell proliferation, cell cycle and apoptosis detection.
RESULTS: RT-PCR showed that the expression level of CK8 in Huh-7-HCV and Huh-7.5-HCV cells was 2.88 and 2.95 times higher than in control cells. Western blot showed that CK8 expression in Huh-7-HCV and Huh-7.5-HCV cells was 2.53 and 3.26 times higher than that in control cells, respectively. We found that CK8 at mRNA and protein levels were both significantly increased in HCVcc. CK8 was up-regulated in SMMC7721 cells. CK8 expression at the mRNA level was significantly upregulated in SMMC7721/pEGFP-CK8 cells. CK8 expression in SMMC7721/ pEGFP-CK8 cells was 2.69 times higher than in SMMC7721 cells, and was 2.64 times higher than in SMMC7721/pEGFP-C1 cells. CK8 expression at the protein level in SMMC7721/pEGFP-CK8 cells was 2.46 times higher than in SMMC7721 cells, and was 2.29 times higher than in SMMC7721/pEGFP-C1 cells. Further analysis demonstrated that forced expression of CK8 slowed cell growth and induced apoptosis of SMMC7721 cells.
CONCLUSION: CK8 up-regulation might have a functional role in HCV infection and pathogenesis, and could be a promising target for the treatment of HCV infection.
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