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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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Qi L, Luo L, Meng X, Zhang J, Yu T, Nie X, Liu Q. Risk factors for lumbar disc herniation in adolescents and young adults: A case-control study. Front Surg 2023; 9:1009568. [PMID: 36684299 PMCID: PMC9852704 DOI: 10.3389/fsurg.2022.1009568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/14/2022] [Indexed: 01/07/2023] Open
Abstract
Background There is a limited understanding of the risk factors for lumbar disc herniation (LDH) in younger people, even though the evidence suggests that LDH is more prevalent in this population. This study aimed to comprehensively analyze the risk factors for LDH in adolescents and young adults. Methods The medical records of all patients were retrospectively reviewed with inclusion criteria of being younger than 25 years. Magnetic resonance imaging (MRI) was used to confirm LDH from September 2016 to September 2021. Furthermore, 104 healthy people in the same age range were enrolled as the control group from physical examination centers. Gender, BMI, smoking, drinking, genetic history, sitting posture, daily sitting time, traumatic history of the lower back, scoliosis, and daily exercise time were examined for all enrolled people. These factors were statistically analyzed to determine the high-risk factors. Results A total of 208 young individuals were enrolled in the present study. The mean age of the study group and the control group was 21.06 ± 3.27 years (range: 11-25 years) and 21.26 ± 2.23 years (range: 15-25 years), respectively. The result of the chi-squared test demonstrated that there was a significant difference in BMI of more than 30 (p < 0.001), genetic history (p = 0.004), sitting posture (p < 0.001), daily sitting time of more than 6 h (p < 0.001), and the history of low back trauma (p = 0.002). Additionally, multivariate logistic regression showed that these were high-risk factors for LDH, particularly the duration of daily sitting time (more than 6 h). Conclusions BMI of more than 30, genetic history, sitting posture, daily sitting time of more than 6 h, and a history of low back trauma are the high-risk factors for adolescents and young adults with LDH. Therefore, providing them with the proper guidance and education, particularly about the protection of the lower back and the reduction of spinal load, could play a key role in preventing and reducing LDH.
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Affiliation(s)
- Le Qi
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Lijuan Luo
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Xianrong Meng
- Department of Nursing, The Second Hospital of Jilin University, Changchun, China
| | - Jun Zhang
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Tong Yu
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Xinyu Nie
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China
| | - Qinyi Liu
- Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China,Correspondence: Qinyi Liu
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Exogenous Klotho ameliorates extracellular matrix degradation and angiogenesis in intervertebral disc degeneration via inhibition of the Rac1/PAK1/MMP-2 signaling axis. Mech Ageing Dev 2022; 207:111715. [PMID: 35952859 DOI: 10.1016/j.mad.2022.111715] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/02/2022] [Accepted: 08/03/2022] [Indexed: 11/21/2022]
Abstract
Intervertebral disc degeneration (IDD) is highly ubiquitous in the aged population and is an essential factor for low back pain and spinal disability. Because of the association between IDD and senescence, we investigated the ability of the anti-aging drug Klotho to inhibit age-dependent advancement of nucleus pulposus cell (NPC) degeneration. The results indicated that 400 pM exogenous Klotho significantly ameliorated extracellular matrix degradation and angiogenesis. Moreover, we demonstrated that the suppression of angiogenesis and extracellular matrix catabolism was related to inhibition of the Ras-related C3 botulinum toxin substrate 1 (Rac1)/PAK1 axis and matrix metalloproteinase 2 protein expression by exogenous Klotho cotreatment with a Rac1 inhibitor, gene overexpression in NPCs, and stimulation of human umbilical vein endothelial cells with conditioned medium from NPCs. The treatment also preserved the NPC phenotype, viability, and matrix content. In conclusion, these results suggest that the new anti-aging drug Klotho is a potential treatment strategy to mitigate IDD, and thus, provides an innovative understanding of the molecular mechanism of IDD. DATA AVAILABILITY: All data supporting the findings of this study are available from the corresponding authors upon reasonable request.
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Hickman TT, Rathan-Kumar S, Peck SH. Development, Pathogenesis, and Regeneration of the Intervertebral Disc: Current and Future Insights Spanning Traditional to Omics Methods. Front Cell Dev Biol 2022; 10:841831. [PMID: 35359439 PMCID: PMC8963184 DOI: 10.3389/fcell.2022.841831] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/09/2022] [Indexed: 02/06/2023] Open
Abstract
The intervertebral disc (IVD) is the fibrocartilaginous joint located between each vertebral body that confers flexibility and weight bearing capabilities to the spine. The IVD plays an important role in absorbing shock and stress applied to the spine, which helps to protect not only the vertebral bones, but also the brain and the rest of the central nervous system. Degeneration of the IVD is correlated with back pain, which can be debilitating and severely affects quality of life. Indeed, back pain results in substantial socioeconomic losses and healthcare costs globally each year, with about 85% of the world population experiencing back pain at some point in their lifetimes. Currently, therapeutic strategies for treating IVD degeneration are limited, and as such, there is great interest in advancing treatments for back pain. Ideally, treatments for back pain would restore native structure and thereby function to the degenerated IVD. However, the complex developmental origin and tissue composition of the IVD along with the avascular nature of the mature disc makes regeneration of the IVD a uniquely challenging task. Investigators across the field of IVD research have been working to elucidate the mechanisms behind the formation of this multifaceted structure, which may identify new therapeutic targets and inform development of novel regenerative strategies. This review summarizes current knowledge base on IVD development, degeneration, and regenerative strategies taken from traditional genetic approaches and omics studies and discusses the future landscape of investigations in IVD research and advancement of clinical therapies.
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Affiliation(s)
- Tara T. Hickman
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States
- Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, United States
- Vanderbilt Center for Bone Biology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Sudiksha Rathan-Kumar
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States
- Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, United States
- Vanderbilt Center for Bone Biology, Vanderbilt University Medical Center, Nashville, TN, United States
| | - Sun H. Peck
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States
- Division of Clinical Pharmacology, Vanderbilt University Medical Center, Nashville, TN, United States
- Vanderbilt Center for Bone Biology, Vanderbilt University Medical Center, Nashville, TN, United States
- *Correspondence: Sun H. Peck,
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Tu J, Li W, Yang S, Yang P, Yan Q, Wang S, Lai K, Bai X, Wu C, Ding W, Cooper‐White J, Diwan A, Yang C, Yang H, Zou J. Single-Cell Transcriptome Profiling Reveals Multicellular Ecosystem of Nucleus Pulposus during Degeneration Progression. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103631. [PMID: 34825784 PMCID: PMC8787427 DOI: 10.1002/advs.202103631] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/22/2021] [Indexed: 05/13/2023]
Abstract
Although degeneration of the nucleus pulposus (NP) is a major contributor to intervertebral disc degeneration (IVDD) and low back pain, the underlying molecular complexity and cellular heterogeneity remain poorly understood. Here, a comprehensive single-cell resolution transcript landscape of human NP is reported. Six novel human NP cells (NPCs) populations are identified by their distinct molecular signatures. The potential functional differences among NPC subpopulations are analyzed. Predictive transcripts, transcriptional factors, and signal pathways with respect to degeneration grades are explored. It is reported that fibroNPCs is the subpopulation for end-stage degeneration. CD90+NPCs are observed to be progenitor cells in degenerative NP tissues. NP-infiltrating immune cells comprise a previously unrecognized diversity of cell types, including granulocytic myeloid-derived suppressor cells (G-MDSCs). Integrin αM (CD11b) and oxidized low density lipoprotein receptor 1 (OLR1) as surface markers of NP-derived G-MDSCs are uncovered. The G-MDSCs are found to be enriched in mildly degenerated (grade II and III) NP tissues compared to severely degenerated (grade IV and V) NP tissues. Their immunosuppressive function and alleviation effects on NPCs' matrix degradation are revealed in vitro. Collectively, this study reveals the NPC-type complexity and phenotypic characteristics in NP, thereby providing new insights and clues for IVDD treatment.
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Affiliation(s)
- Ji Tu
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
- Spine Labs, St. George and Sutherland Clinical SchoolFaculty of MedicineUniversity of New South WalesSydneyNew South Wales2217Australia
| | - Wentian Li
- Spine Labs, St. George and Sutherland Clinical SchoolFaculty of MedicineUniversity of New South WalesSydneyNew South Wales2217Australia
| | - Sidong Yang
- Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt. LuciaBrisbaneQueensland4072Australia
- Department of Spine SurgeryThe Third Hospital of Hebei Medical UniversityShijiazhuang05000China
| | - Pengyi Yang
- Charles Perkins CentreThe University of SydneySydneyNSW2006Australia
- School of Life and Environmental SciencesThe University of SydneySydneyNSW2006Australia
- Computational Systems Biology GroupChildren's Medical Research InstituteFaculty of Medicine and HealthThe University of SydneyWestmeadNSW2145Australia
| | - Qi Yan
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
| | - Shenyu Wang
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
| | - Kaitao Lai
- The ANZAC Research InstituteConcord Repatriation General HospitalSydneyNSW2139Australia
- Concord Clinical SchoolFaculty of Medicine and HealthThe University of SydneySydneyNSW2139Australia
| | - Xupeng Bai
- Cancer Care CentreSt. George and Sutherland Clinical SchoolFaculty of MedicineUniversity of New South WalesSydneyNew South Wales2052Australia
| | - Cenhao Wu
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
| | - Wenyuan Ding
- Department of Spine SurgeryThe Third Hospital of Hebei Medical UniversityShijiazhuang05000China
| | - Justin Cooper‐White
- Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandSt. LuciaBrisbaneQueensland4072Australia
- School of Chemical EngineeringThe University of QueenslandBrisbaneQueensland4072Australia
| | - Ashish Diwan
- Spine Labs, St. George and Sutherland Clinical SchoolFaculty of MedicineUniversity of New South WalesSydneyNew South Wales2217Australia
- Spine ServiceDepartment of Orthopaedic SurgerySt. George HospitalKogarahNew South Wales2217Australia
| | - Cao Yang
- Department of Orthopaedic SurgeryWuhan Union HospitalTongji Medical SchoolHuazhong University of Science and TechnologyWuhanHubei430022China
| | - Huilin Yang
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
| | - Jun Zou
- Department of Orthopaedic SurgeryThe First Affiliated Hospital of Soochow UniversitySuzhou215006China
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Ye Z, Zhao S, Liu Z. Prevention of lumbar disc degeneration through co-manipulation of insulin-like growth factor 1 and vascular endothelial growth factor. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:1572. [PMID: 34790778 PMCID: PMC8576649 DOI: 10.21037/atm-21-4977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 10/13/2021] [Indexed: 11/13/2022]
Abstract
Background Associated with abnormal angiogenesis and disc dysfunction, lumbar disc degeneration (LDD) appears to be an important disease suffered by elderly people. Previous studies have highlighted the importance of insufficient insulin-like growth factor 1 (IGF1) and excessive vascular endothelial growth factor (VEGF) in the development and progression of LDD, though a practical therapeutic strategy is lacking. Methods The expression of IGF1 and VEGF was assessed in LDD specimens compared to normal disc tissue as a control. A gene therapy approach was performed, in which an adeno-associated virus (AAV) carrying both IGF1 and shVEGF (AAV-IGF1/shVEGF) was orthotopically injected to the rats that had undergone LDD. The alterations in IGF1 and VEGF levels in the treated disc tissue were confirmed by immunohistochemistry. The outcome of this therapy was assessed by disc cell death using an annexin V-FITC assay and by assessing lumbar proteoglycan and collagen II levels using ELISA. Results IGF1 expression was significantly downregulated in LDD, while VEGF expression was significantly upregulated in LDD, compared to normal controls. Combined AAV-IGF1/shVEGF treatment simultaneously corrected the insufficient IGF1 and the excessive VEGF in LDD rats. Moreover, AAV-IGF1/shVEGF significantly reduced disc cell death in the vertebral pulp and annulus fibrosus and significantly enhanced the lumbar proteoglycan and collagen II levels. Conclusions The simultaneous increase in IGF1 and depletion of VEGF effectively prevented the development of LDD, suggesting its potential as a novel therapeutic approach for LDD which is clinically translatable.
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Affiliation(s)
- Zuozhou Ye
- Department of Orthopedics, Qingpu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China
| | - Shan Zhao
- Department of Orthopedics, Qingpu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China
| | - Zuoqing Liu
- Department of Orthopedics, Qingpu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, China
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Xu Z, Zheng J, Zhang Y, Wu H, Sun B, Zhang K, Wang J, Zang F, Zhang X, Guo L, Wu X. Increased Expression of Integrin Alpha 6 in Nucleus Pulposus Cells in Response to High Oxygen Tension Protects against Intervertebral Disc Degeneration. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:8632823. [PMID: 34707783 PMCID: PMC8545551 DOI: 10.1155/2021/8632823] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/18/2021] [Accepted: 09/25/2021] [Indexed: 11/17/2022]
Abstract
The destruction of the low oxygen microenvironment in nucleus pulposus (NP) cells played a critical role in the pathogenesis of intervertebral disc degeneration (IVDD). The purpose of this study was to determine the potential role of integrin alpha 6 (ITG α6) in NP cells in response to high oxygen tension (HOT) in IVDD. Immunofluorescence staining and western blot analysis showed that the levels of ITG α6 expression were increased in the NP tissue from IVDD patients and the IVDD rat model with mild degeneration, which were reduced as the degree of degeneration increases in severity. In NP cells, the treatment of HOT resulted in upregulation of ITG α6 expression, which could be alleviated by blocking the PI3K/AKT signaling pathway. Further studies found that ITG α6 could protect NP cells against HOT-induced apoptosis and oxidative stress and protect NP cells from HOT-inhibited ECM protein synthesis. Upregulation of ITG α6 expression by HOT contributed to maintaining NP tissue homeostasis through the interaction with hypoxia-inducible factor-1α (HIF-1α). Furthermore, silencing of ITG α6 in vivo could obviously accelerate puncture-induced IVDD. Taken together, these results revealed that the increase of ITG α6 expression by HOT in NP cells might be a protective factor in IVD degeneration as well as restore NP cell function.
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Affiliation(s)
- Zeng Xu
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Jiancheng Zheng
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiaotong University School of Medicine, China
| | - Ying Zhang
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Huiqiao Wu
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Bin Sun
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Ke Zhang
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Jianxi Wang
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Fazhi Zang
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
| | - Xingkai Zhang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiaotong University School of Medicine, China
| | - Lei Guo
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Orthopaedics and Traumatology, Shanghai Ruijin Hospital, Shanghai Jiaotong University School of Medicine, China
| | - Xiaodong Wu
- Department of Orthopedics, Changzheng Hospital, The Naval Medical University, Shanghai, China
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Zhang G, Liu M, Chen H, Wu Z, Gao Y, Ma Z, He X, Kang X. NF-κB signalling pathways in nucleus pulposus cell function and intervertebral disc degeneration. Cell Prolif 2021; 54:e13057. [PMID: 34028920 PMCID: PMC8249791 DOI: 10.1111/cpr.13057] [Citation(s) in RCA: 112] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 03/25/2021] [Accepted: 05/01/2021] [Indexed: 02/06/2023] Open
Abstract
Intervertebral disc degeneration (IDD) is a common clinical degenerative disease of the spine. A series of factors, such as inflammation, oxidative stress and mechanical stress, promote degradation of the extracellular matrix (ECM) of the intervertebral discs (IVD), leading to dysfunction and structural destruction of the IVD. Nuclear factor-κB (NF-κB) transcription factor has long been regarded as a pathogenic factor of IDD. Therefore, NF-κB may be an ideal therapeutic target for IDD. As NF-κB is a multifunctional functional transcription factor with roles in a variety of biological processes, a comprehensive understanding of the function and regulatory mechanism of NF-κB in IDD pathology will be useful for the development of targeted therapeutic strategies for IDD, which can prevent the progression of IDD and reduce potential risks. This review discusses the role of the NF-κB signalling pathway in the nucleus pulposus (NP) in the process of IDD to understand pathological NP degeneration further and provide potential therapeutic targets that may interfere with NF-κB signalling for IDD therapy.
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Affiliation(s)
- Guang‐Zhi Zhang
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Ming‐Qiang Liu
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Hai‐Wei Chen
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Zuo‐Long Wu
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Yi‐Cheng Gao
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Zhan‐Jun Ma
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Xue‐Gang He
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
| | - Xue‐Wen Kang
- Department of OrthopedicsLanzhou University Second HospitalLanzhouChina
- The Second Clinical Medical CollegeLanzhou UniversityLanzhouChina
- Key Laboratory of Orthopedics Disease of Gansu ProvinceLanzhou University Second HospitalLanzhouChina
- The International Cooperation Base of Gansu Province for the Pain Research in Spinal DisordersLanzhouChina
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Harmon MD, Ramos DM, Nithyadevi D, Bordett R, Rudraiah S, Nukavarapu SP, Moss IL, Kumbar SG. Growing a backbone - functional biomaterials and structures for intervertebral disc (IVD) repair and regeneration: challenges, innovations, and future directions. Biomater Sci 2020; 8:1216-1239. [PMID: 31957773 DOI: 10.1039/c9bm01288e] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Back pain and associated maladies can account for an immense amount of healthcare cost and loss of productivity in the workplace. In particular, spine related injuries in the US affect upwards of 5.7 million people each year. The degenerative disc disease treatment almost always arises due to a clinical presentation of pain and/or discomfort. Preferred conservative treatment modalities include the use of non-steroidal anti-inflammatory medications, physical therapy, massage, acupuncture, chiropractic work, and dietary supplements like glucosamine and chondroitin. Artificial disc replacement, also known as total disc replacement, is a treatment alternative to spinal fusion. The goal of artificial disc prostheses is to replicate the normal biomechanics of the spine segment, thereby preventing further damage to neighboring sections. Artificial functional disc replacement through permanent metal and polymer-based components continues to evolve, but is far from recapitulating native disc structure and function, and suffers from the risk of unsuccessful tissue integration and device failure. Tissue engineering and regenerative medicine strategies combine novel material structures, bioactive factors and stem cells alone or in combination to repair and regenerate the IVD. These efforts are at very early stages and a more in-depth understanding of IVD metabolism and cellular environment will also lead to a clearer understanding of the native environment which the tissue engineering scaffold should mimic. The current review focusses on the strategies for a successful regenerative scaffold for IVD regeneration and the need for defining new materials, environments, and factors that are so finely tuned in the healthy human intervertebral disc in hopes of treating such a prevalent degenerative process.
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Affiliation(s)
- Matthew D Harmon
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, USA. and Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Daisy M Ramos
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, USA. and Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA
| | - D Nithyadevi
- Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Rosalie Bordett
- Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Swetha Rudraiah
- Department of Pharmaceutical Sciences, University of Saint Joseph, Hartford, CT, USA
| | - Syam P Nukavarapu
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, USA. and Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA and Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
| | - Isaac L Moss
- Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Sangamesh G Kumbar
- Department of Materials Science and Engineering, University of Connecticut, Storrs, CT, USA. and Department of Orthopedics Surgery, University of Connecticut Health, Farmington, CT, USA and Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
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10
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Hypoxia Helps Maintain Nucleus Pulposus Homeostasis by Balancing Autophagy and Apoptosis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:5915481. [PMID: 33029281 PMCID: PMC7528147 DOI: 10.1155/2020/5915481] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/18/2020] [Accepted: 09/08/2020] [Indexed: 12/26/2022]
Abstract
Intervertebral disc degeneration (IVDD) is a common cause of lower back pain. Programmed cell death (PCD) including apoptosis and autophagy is known to play key mechanistic roles in the development of IVDD. We hypothesized that the nucleus pulposus cells that make up the center of the IVD can be affected by aging and environmental oxygen concentration, thus affecting the development of IVDD. Here, we evaluated the phenotype changes and PCD signaling in nucleus pulposus cells in two different oxygen percentages (5% (hypoxia) and 20% (normoxia)) up to serial passage 20. NP cells were isolated from the lumbar discs of rats, and the chondrogenic, autophagic, and apoptotic gene expressions were analyzed during cell culture up to serial passage 20. Hypoxia significantly increased the number of autophagosomes, as determined by monodansylcadaverine staining and transmission electron microscopy. Furthermore, hypoxia triggered the activation of autophagic flux (beclin-1, LC3-II/LC3-I ratio, and SIRT1) with a concomitant decrease in the expression of apoptotic proteins (Bax and caspase-3). Despite injury and age differences, no significant differences were observed between the ex vivo lumbar disc cultures of groups incubated in the hypoxic chamber. Our study provides a better understanding of autophagy- and apoptosis-related senescence in NP cells. These results also provide insight into the effects of aging on NP cells and their PCD levels during aging.
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Surgical Management of L5-S1 Spondylodiscitis on Previously Documented Isthmic Spondylolisthesis: Case Report and Review of the Literature. Case Rep Surg 2020; 2020:1408701. [PMID: 32128267 PMCID: PMC7048921 DOI: 10.1155/2020/1408701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 10/30/2019] [Indexed: 11/18/2022] Open
Abstract
Background Although lumbar isthmic spondylolisthesis is frequent in the Caucasian population, its association with spondylodiscitis is extremely rare. Case Description. The authors reported the case of a 44-year-old patient affected by pyogenic spondylodiscitis on previously documented isthmic spondylolisthesis at the L5-S1 level. The patient was surgically treated by circumferential arthrodesis combining anterior lumbar interbody fusion (ALIF), followed by L4-S1 percutaneous osteosynthesis using the same anesthesia. Appropriate antibiotherapy to methicillin-susceptible Staphylococcus aureus, found on the intraoperative samplings, was then delivered for 3 months, allowing satisfactory evolution on the clinical, biological, and radiological levels. Discussion. This is the first case report of spondylodiscitis affecting an isthmic spondylolisthesis surgically treated by circumferential arthrodesis. In addition to providing large samplings for analysis, it confirms the observed evolution over the past 30 years in modern care history of spondylodiscitis, increasingly including surgical treatment with spinal instrumentation, thus avoiding the need of an external immobilization. Care must nonetheless be exercised in performing the ALIF because of the inflammatory tissue increasing the risk of vascular injury. Conclusion Spondylodiscitis occurring on an L5-S1 isthmic spondylolisthesis can be safely managed by circumferential arthrodesis combining ALIF then percutaneous osteosynthesis in the same anesthesia, obviously followed by appropriate antibiotherapy.
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Wang Y, Dai G, Li L, Liu L, Jiang L, Li S, Liao S, Wang F, Du W, Li Y. Transcriptome signatures reveal candidate key genes in the whole blood of patients with lumbar disc prolapse. Exp Ther Med 2019; 18:4591-4602. [PMID: 31777557 PMCID: PMC6862187 DOI: 10.3892/etm.2019.8137] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 09/04/2019] [Indexed: 12/14/2022] Open
Abstract
The present study aimed to investigate differentially expressed genes (DEGs) in whole blood (WB) obtained from patients with lumbar disc prolapse (LDP) and healthy volunteers. A total of 8 patients with LDP and 8 healthy volunteers were recruited. An Agilent SurePrint G3 human gene expression microarray 8×60 K was used to perform the microarray analyses. R was employed to identify DEGs, which were then subjected to bioinformatics analysis, including a Gene Ontology (GO) analysis, Kyoto Encyclopaedia of Genes and Genomes (KEGG) pathway analysis and protein-protein interaction (PPI) network analysis. DEGs in the degenerative annulus fibrosis (AF) and nucleus pulposus (NP) compared with non-degenerative tissues were also identified based on microarray data and the intersections of the three were assessed. Furthermore, reverse transcription-quantitative (RT-q)PCR was performed to confirm the aberrant expression levels of selected DEGs in the WB of all subjects. A total of 161 DEGs between LDP patients and the healthy controls were identified (128 upregulated and 33 downregulated). These DEGs were enriched in 293 biological process, 36 cellular component and 21 molecular function GO terms, as well as in 24 KEGG pathways. The PPI network contained 4 submodules, and Toll-like receptor 4 had the highest degree centrality. A total of 22 DEGs were common to the three groups of DEGs. The RT-qPCR assay confirmed that the expression levels of cytochrome P450 family 27 subfamily A member 1, superoxide dismutase 2, protein disulfide isomerase family A member 4, FKBP prolyl isomerase 11 and ectonucleotide pyrophosphatase/phosphodiesterase 4 were significantly different between the patient group and the volunteer group. In conclusion, several genes were identified as potential biomarkers in WB that should be further explored in future studies to determine their potential application in the clinical treatment and diagnosis of LDP, and the present bioinformatics analysis revealed several GO terms, KEGG pathways and submodules of the PPI network that may be involved in LDP, although the exact mechanisms remain elusive.
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Affiliation(s)
- Yi Wang
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Guogang Dai
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Lengtao Li
- Postgraduate School, Chengdu Sport Institute, Chengdu, Sichuan 610041, P.R. China
| | - Lijuan Liu
- Postgraduate School, Chengdu Sport Institute, Chengdu, Sichuan 610041, P.R. China
| | - Ling Jiang
- College Hospital, Sichuan Agricultural University - Chengdu Campus, Chengdu, Sichuan 611130, P.R. China
| | - Shengwu Li
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Shichuan Liao
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Feng Wang
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Wanli Du
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Yuewen Li
- Cervicodynia/Omalgia/Lumbago/Sciatica Department, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
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Wang Y, Dai G, Wang L, Shang F, Jiang L, Li S, Huang L, Xia J, Wei H. Identification of Key Genes Potentially Related to Intervertebral Disk Degeneration by Microarray Analysis. Genet Test Mol Biomarkers 2019; 23:610-617. [PMID: 31368816 DOI: 10.1089/gtmb.2019.0043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Aims: This study was designed to investigate differentially expressed genes (DEGs) in the annulus fibrosus (AF), nucleus pulposus (NP), and whole blood (WB) of intervertebral disk degeneration (IDD) patients. Materials and Methods: We retrieved microarray data set GSE70362, which contains the gene expression profiles of 24 AF and 24 NP samples from the Gene Expression Omnibus and identified DEGs in degenerative AF (AF-DEGs) and NP (NP-DEGs) samples compared with nondegenerative samples. We also examined gene expression profiles in WB from patients with IDD and healthy volunteers to identify DEGs in WB (WB-DEGs). We performed functional analyses on the DEGs common to AF-DEGs, NP-DEGs, and WB-DEGs. Expression of the common DEGs was partially validated by quantitative real-time-polymerase chain reaction (QRT-PCR). Results: In total, 846 AF-DEGs, 902 NP-DEGs, and 862 WB-DEGs were identified, and 22 DEGs were common among the three groups. Functional analyses showed that the common DEGs were enriched in 33 biological processes, 16 cellular components, 4 molecular functions, and 9 Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways; 13 of the common DEGs were included in the protein-protein interaction (PPI) network and superoxide dismutase 2 (SOD2) was identified as a hub gene in the PPI network. The QRT-PCR results for the expression of the genes protein disulfide isomerase family A member 4, FKBP prolyl isomerase 11, ectonucleotide pyrophosphatase/phosphodiesterase 4, SOD2, and actin binding LIM protein 1, were consistent with the gene chip hybridization results. Conclusions: This study identified key genes for future investigations of the underlying molecular mechanisms of IDD. These genes may provide future targets for the clinical treatment and diagnosis of IDD.
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Affiliation(s)
- Yi Wang
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Guogang Dai
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Lanjie Wang
- Postgraduate School, Chengdu Sport Institute, Chengdu, China
| | - Fangru Shang
- Postgraduate School, Chengdu Sport Institute, Chengdu, China
| | - Ling Jiang
- College Hospital, Sichuan Agricultural University, Chengdu Campus, Chengdu, China
| | - Shengwu Li
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Lei Huang
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Jiao Xia
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
| | - Hao Wei
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, China
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Zhao R, Liu W, Xia T, Yang L. Disordered Mechanical Stress and Tissue Engineering Therapies in Intervertebral Disc Degeneration. Polymers (Basel) 2019; 11:polym11071151. [PMID: 31284436 PMCID: PMC6680713 DOI: 10.3390/polym11071151] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 06/27/2019] [Accepted: 07/01/2019] [Indexed: 12/11/2022] Open
Abstract
Low back pain (LBP), commonly induced by intervertebral disc degeneration, is a lumbar disease with worldwide prevalence. However, the mechanism of degeneration remains unclear. The intervertebral disc is a nonvascular organ consisting of three components: Nucleus pulposus, annulus fibrosus, and endplate cartilages. The disc is structured to support our body motion and endure persistent external mechanical pressure. Thus, there is a close connection between force and intervertebral discs in LBP. It is well established that with aging, disordered mechanical stress profoundly influences the fate of nucleus pulposus and the alignment of collagen fibers in the annulus fibrosus. These support a new understanding that disordered mechanical stress plays an important role in the degeneration of the intervertebral discs. Tissue-engineered regenerative and reparative therapies are being developed for relieving disc degeneration and symptoms of lower back pain. In this paper, we will review the current literature available on the role of disordered mechanical stress in intervertebral disc degeneration, and evaluate the existing tissue engineering treatment strategies of the current therapies.
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Affiliation(s)
- Runze Zhao
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, China
| | - Wanqian Liu
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, China
| | - Tingting Xia
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, China.
| | - Li Yang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400044, China.
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15
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Rider SM, Mizuno S, Kang JD. Molecular Mechanisms of Intervertebral Disc Degeneration. Spine Surg Relat Res 2019; 3:1-11. [PMID: 31435545 PMCID: PMC6690117 DOI: 10.22603/ssrr.2017-0095] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 01/24/2018] [Indexed: 12/25/2022] Open
Abstract
Intervertebral disc degeneration is a well-known cause of disability, the result of which includes neck and back pain with associated mobility limitations. The purpose of this article is to provide an overview of the known molecular mechanisms through which intervertebral disc degeneration occurs as a result of complex interactions of exogenous and endogenous stressors. This review will focus on some of the identified molecular changes leading to the deterioration of the extracellular matrix of both the annulus fibrosus and nucleus pulposus. In addition, we will provide a summation of our current knowledge supporting the role of associated DNA and intracellular damage, cellular senescence's catabolic effects, oxidative stress, and the cell's inappropriate response to damage in contributing to intervertebral disc degeneration. Our current understanding of the molecular mechanisms through which intervertebral disc degeneration occurs provides us with abundant insight into how physical and chemical changes exacerbate the degenerative process of the entire spine. Furthermore, we will describe some of the related molecular targets and therapies that may contribute to intervertebral repair and regeneration.
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Affiliation(s)
- Sean M Rider
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Shuichi Mizuno
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - James D Kang
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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16
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Sheng X, Guo Q, Yu J, Xu Y. Experimental research on the effect of microRNA-21 inhibitor on a rat model of intervertebral disc degeneration. Exp Ther Med 2018; 16:67-72. [PMID: 29896228 PMCID: PMC5995058 DOI: 10.3892/etm.2018.6156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 01/08/2018] [Indexed: 12/19/2022] Open
Abstract
Intervertebral disc degeneration is associated with angiogenesis and is the primary cause of disc-associated disease. Several studies have indicated the importance of microRNA (miR)-21 in angiogenesis. Thus, the present study aimed to validate the role and underlying mechanisms of miR-21 in a rat model of intervertebral disc degeneration. A total of 60 specific-pathogen-free Sprague-Dawley rats were used for in vivo experiments. A rat model of intervertebral disc degeneration was established and miR-21 inhibitor (antagomiR-21) was administered. The vertebral pulp and annulus fibrosus were isolated for immunohistochemical analysis of hypoxia inducible factor (HIF)-1α and vascular endothelial growth factor (VEGF) expression. Lumbar spine proteoglycan content was detected with the phloroglucinol method. Disc cell apoptosis was detected with terminal deoxynucleotidyl-transferase-mediated dUTP nick end labeling staining. It was revealed that antagomiR-21 treatment decreased the expression of HIF-1α and VEGF in the vertebral pulp and annulus fibrosus. Furthermore, antagomiR-21 treatment increased proteoglycan content and inhibited cell apoptosis in lumbar spines from model rats with intervertebral disc degeneration. In conclusion, antagomiR-21 treatment exerted a protective role in a rat model of intervertebral disc degeneration, which may provide the basis for a potential therapeutic approach in the treatment of disc-associated diseases.
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Affiliation(s)
- Xiaoming Sheng
- Department of Orthopedics, The Affiliated Second Hospital of Soochow University, Suzhou, Jiangsu 215000, P.R. China
| | - Qingsong Guo
- Department of General Surgery, The First Affiliated Hospital of Nantong University, Nantong, Jiangsu 225001, P.R. China
| | - Junbo Yu
- Department of Emergency, The First Affiliated Hospital of Nantong University, Nantong, Jiangsu 225001, P.R. China
| | - Youjia Xu
- Department of Orthopedics, The Affiliated Second Hospital of Soochow University, Suzhou, Jiangsu 215000, P.R. China
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17
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Feng C, Zhang Y, Yang M, Lan M, Huang B, Liu H, Zhou Y. Transcriptome and alternative splicing analysis of nucleus pulposus cells in response to high oxygen tension: Involvement of high oxygen tension in the pathogenesis of intervertebral disc degeneration. Int J Mol Med 2018; 41:3422-3432. [PMID: 29512703 PMCID: PMC5881661 DOI: 10.3892/ijmm.2018.3523] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 02/22/2018] [Indexed: 12/31/2022] Open
Abstract
High oxygen tension caused by neovascularization in the microenvironment of intervertebral discs (IVDs) is associated with the pathogenesis of IVD degeneration (IDD). Pre-mRNAs undergo alternative splicing (AS) to produce structurally and functionally diverse mRNA and proteins. However, the precise role of high oxygen tension in IDD and the relationship between AS and high oxygen tension in disc cells remain unknown. To investigate the effect of high oxygen tension on disc cells, Affymetrix Rat Transcriptome Array 1.0 was used to determine differentially expressed genes (DEGs) and alternative splicing genes (ASGs) in rat nucleus pulposus (NP) cells treated with 20% O2. NP cells at 1% O2 served as the control. PCR was used for validation. GO and KEGG pathway analysis was performed. Furthermore, the reactive oxygen species (ROS) production, growth, cell cycle and matrix metabolism of NP cells were also investigated. In total, 2499 DEGs and 8451 ASGs were identified. Various GO terms and KEGG pathways were potently associated with IDD, including autophagy, mTOR signaling pathway and angiogenesis. Especially, high oxygen tension increased ROS production in NP cells. It also accelerated the matrix metabolism of NP cells and induced NP cell cycle arrest to retard cell growth. This study, for the first time, analyzes the transcriptome and AS of NP cells in response to high oxygen tension, indicating that high oxygen tension is involved in the establishment and progression of IDD through its wide effects on the viability and function of disc cells.
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Affiliation(s)
- Chencheng Feng
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Yang Zhang
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Minghui Yang
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Minghong Lan
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Bo Huang
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, The Third Military Medical University, Chongqing 400037, P.R. China
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18
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Wiet MG, Piscioneri A, Khan SN, Ballinger MN, Hoyland JA, Purmessur D. Mast Cell-Intervertebral disc cell interactions regulate inflammation, catabolism and angiogenesis in Discogenic Back Pain. Sci Rep 2017; 7:12492. [PMID: 28970490 PMCID: PMC5624870 DOI: 10.1038/s41598-017-12666-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 09/19/2017] [Indexed: 01/07/2023] Open
Abstract
Low back pain (LBP) is a widespread debilitating disorder of significant socio-economic importance and intervertebral disc (IVD) degeneration has been implicated in its pathogenesis. Despite its high prevalence the underlying causes of LBP and IVD degeneration are not well understood. Recent work in musculoskeletal degenerative diseases such as osteoarthritis have revealed a critical role for immune cells, specifically mast cells in their pathophysiology, eluding to a potential role for these cells in the pathogenesis of IVD degeneration. This study sought to characterize the presence and role of mast cells within the IVD, specifically, mast cell-IVD cell interactions using immunohistochemistry and 3D in-vitro cell culture methods. Mast cells were upregulated in painful human IVD tissue and induced an inflammatory, catabolic and pro-angiogenic phenotype in bovine nucleus pulposus and cartilage endplate cells at the gene level. Healthy bovine annulus fibrosus cells, however, demonstrated a protective role against key inflammatory (IL-1β and TNFα) and pro-angiogenic (VEGFA) genes expressed by mast cells, and mitigated neo-angiogenesis formation in vitro. In conclusion, mast cells can infiltrate and elicit a degenerate phenotype in IVD cells, enhancing key disease processes that characterize the degenerate IVD, making them a potential therapeutic target for LBP.
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Affiliation(s)
- Matthew G Wiet
- Department of Biomedical Engineering, The Ohio State University, Columbus Ohio, 201 Davis Heart and Lung Research Institute, 473 W 12th Avenue, Columbus, Ohio, 43210, USA
| | - Andrew Piscioneri
- Department of Biomedical Engineering, The Ohio State University, Columbus Ohio, 201 Davis Heart and Lung Research Institute, 473 W 12th Avenue, Columbus, Ohio, 43210, USA
| | - Safdar N Khan
- Department of Orthopedics, The Ohio State University Wexner Medical Center, 1070 OSU CarePoint East, 543 Taylor Avenue, Columbus, Ohio, 43203, USA
| | - Megan N Ballinger
- Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, The Ohio State University, 201 Davis Heart and Lung Research Institute, 473 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Judith A Hoyland
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Stopford Building, Oxford Road, Manchester, M13 9PT, United Kingdom
- NIHR Manchester Musculoskeletal Biomedical Research Centre, Manchester Academic Health Science Centre, Central Manchester NHS Foundation Trust, Manchester, United Kingdom
| | - Devina Purmessur
- Department of Biomedical Engineering, The Ohio State University, Columbus Ohio, 201 Davis Heart and Lung Research Institute, 473 W 12th Avenue, Columbus, Ohio, 43210, USA.
- Department of Orthopedics, The Ohio State University Wexner Medical Center, 1070 OSU CarePoint East, 543 Taylor Avenue, Columbus, Ohio, 43203, USA.
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Oxygen-Sensing Nox4 Generates Genotoxic ROS to Induce Premature Senescence of Nucleus Pulposus Cells through MAPK and NF- κB Pathways. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7426458. [PMID: 29147462 PMCID: PMC5632907 DOI: 10.1155/2017/7426458] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Revised: 07/18/2017] [Accepted: 08/08/2017] [Indexed: 11/17/2022]
Abstract
Senescence is a crucial driver of intervertebral disc degeneration (IDD). Disc cells are exposed to high oxygen tension due to neovascularization in degenerative discs. However, the effect of oxygen tension on disc cell senescence was unknown. Herein, rat nucleus pulposus (NP) cells were cultured under 20% O2 or 1% O2. Consequently, ROS induced by 20% O2 caused DNA damage and then activated p53-p21-Rb and p16-Rb pathways via ERK signaling to induce NP cell senescence. It also induced catabolic and proinflammatory phenotype of NP cells via MAPK and NF-κB pathways. Furthermore, 20% O2 was found to upregulate Nox4 in NP cells. Small interfering RNA against Nox4 reduced ROS production induced by 20% O2 and consequently suppressed premature senescence of NP cells. On the contrary, NP cells overexpressing Nox4 produced more ROS and rapidly developed senescent signs. In consistent with the in vitro studies, the expression of Nox4, p21, and Rb was upregulated in rat degenerative discs. This study, for the first time, demonstrates that Nox4 is an oxygen-sensing enzyme and a main ROS source in NP cells. Nox4-dependent ROS are genotoxic and a potent trigger of NP cell senescence. Nox4 is a potential therapeutic target for disc cell senescence and IDD.
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Vo NV, Hartman RA, Patil PR, Risbud MV, Kletsas D, Iatridis JC, Hoyland JA, Le Maitre CL, Sowa GA, Kang JD. Molecular mechanisms of biological aging in intervertebral discs. J Orthop Res 2016; 34:1289-306. [PMID: 26890203 PMCID: PMC4988945 DOI: 10.1002/jor.23195] [Citation(s) in RCA: 240] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 02/03/2016] [Indexed: 02/04/2023]
Abstract
Advanced age is the greatest risk factor for the majority of human ailments, including spine-related chronic disability and back pain, which stem from age-associated intervertebral disc degeneration (IDD). Given the rapid global rise in the aging population, understanding the biology of intervertebral disc aging in order to develop effective therapeutic interventions to combat the adverse effects of aging on disc health is now imperative. Fortunately, recent advances in aging research have begun to shed light on the basic biological process of aging. Here we review some of these insights and organize the complex process of disc aging into three different phases to guide research efforts to understand the biology of disc aging. The objective of this review is to provide an overview of the current knowledge and the recent progress made to elucidate specific molecular mechanisms underlying disc aging. In particular, studies over the last few years have uncovered cellular senescence and genomic instability as important drivers of disc aging. Supporting evidence comes from DNA repair-deficient animal models that show increased disc cellular senescence and accelerated disc aging. Additionally, stress-induced senescent cells have now been well documented to secrete catabolic factors, which can negatively impact the physiology of neighboring cells and ECM. These along with other molecular drivers of aging are reviewed in depth to shed crucial insights into the underlying mechanisms of age-related disc degeneration. We also highlight molecular targets for novel therapies and emerging candidate therapeutics that may mitigate age-associated IDD. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1289-1306, 2016.
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Affiliation(s)
- Nam V. Vo
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Robert A. Hartman
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Prashanti R. Patil
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Makarand V. Risbud
- Department of Orthopaedic Surgery, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Dimitris Kletsas
- Laboratory of Cell Proliferation and Ageing, Institute of Biosciences and Applications, National Centre for Scientific Research “Demokritos”, Athens, Greece
| | - James C. Iatridis
- Leni & Peter W May Department of Orthopaedics, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Judith A. Hoyland
- Centre for Tissue Injury and Repair, Faculty of Medical and Human Sciences, University of Manchester M13 9PT and NIHR Manchester Musculoskeletal Biomedical Research Unit, Manchester Academic Health Science Centre, Manchester, UK
| | - Christine L. Le Maitre
- Musculoskeletal and Regenerative Medicine Research Group, Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield, S1 1WB, UK
| | - Gwendolyn A. Sowa
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - James D. Kang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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Turan A, Sarwar S, Atim A, Deogaonkar A, Yousef HF, Katyal S, Liu J, You J, Leizman D, Mekhail N, Sessler DI. Nitrous Oxide for the Treatment of Chronic Low Back Pain. Anesth Analg 2015; 121:1350-9. [DOI: 10.1213/ane.0000000000000951] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Cryopreserved Mesenchymal Stem Cells Stimulate Regeneration in an Intervertebral Disc. Biomedicines 2015; 3:237-247. [PMID: 28536410 PMCID: PMC5344241 DOI: 10.3390/biomedicines3030237] [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: 06/15/2015] [Accepted: 08/03/2015] [Indexed: 01/07/2023] Open
Abstract
Background: Degenerative diseases are a medical, social, and economic problem worldwide. The most significant factors predisposing the development of degenerative changes in intervertebral discs are a low density and poor biosynthetic potential of the cells. Therefore, stem cell therapy in this case should show high clinical efficiency. Methods: The research aim was to evaluate the regenerative potential of cryopreserved mesenchymal stem cells (MSCs) upon degenerative changes in intervertebral discs. Rats with simulated degenerative damage of the intervertebral disc Co6–Co7 were administrated with 0.5 × 106 of either native or cryopreserved cells on a collagen sponge to the defect area. The results of experiments were histomorphometrically evaluated on the 30th, 60th, and 90th days after treatment. Results: The restoration of tears, clefts, and collagen fiber fragmentations was noted on the 60th and 90th day after administration of native and cryopreserved MSCs respectively. An increase in fibrochondrocyte density got ahead of the annulus fibrosus height recovery. In the control group without treatment the regeneration was hardly observed. Conclusion: The use of MSCs promotes the restoration of the degenerated intervertebral disc. Cryopreserved MSCs have a “lag” therapeutic effect at the early stages, but show similar results to the native analogue on the 90th day after administration.
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Current trends in biologics delivery to restore intervertebral disc anabolism. Adv Drug Deliv Rev 2015; 84:146-58. [PMID: 25174310 DOI: 10.1016/j.addr.2014.08.008] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 07/31/2014] [Accepted: 08/20/2014] [Indexed: 12/30/2022]
Abstract
Low back pain is generally attributed to intervertebral disc (IVD) degeneration. This is a multifactorial disease induced by genetic and environmental factors and that progresses with aging. Disc degeneration is characterized by a limited ability of IVD cells to produce functional matrix while producing abnormal amounts of matrix-degrading enzymes. The prolonged imbalance between anabolism and catabolism in degenerative discs alters their composition and hydration. In turn, this results in increased angiogenesis and the loss of the disc's ability to maintain its aneural condition. Inflammation in the IVD, in particular the presence of pro-inflammatory cytokines, was found to favor innervation and also sensitization of the nociceptive pathways, thereby exacerbating degenerative symptoms. In this review, we discuss anti-inflammatory approaches to encounter disc catabolism, potential treatments to lower discogenic pain and pro-anabolic approaches in the form of protein delivery, gene therapy and cell delivery, to trigger regeneration in the IVD.
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Yang L, Rong Z, Zeng M, Cao Y, Gong X, Lin L, Chen Y, Cao W, Zhu L, Dong W. Pyrroloquinoline quinone protects nucleus pulposus cells from hydrogen peroxide-induced apoptosis by inhibiting the mitochondria-mediated pathway. 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; 24:1702-10. [PMID: 25349108 DOI: 10.1007/s00586-014-3630-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Revised: 10/17/2014] [Accepted: 10/17/2014] [Indexed: 11/24/2022]
Abstract
PURPOSE Intervertebral disc cell apoptosis has been suggested to play a key role in promoting disc degeneration, and many studies have shown that the mechanism may be related to oxidative stress. Pyrroloquinoline quinone (PQQ), a redox cofactor for bacterial dehydrogenases, possesses the potential to scavenge reactive oxygen species (ROS) and inhibit cell apoptosis. The objective of this study was to evaluate the effects of PQQ on cultured rat nucleus pulposus (NP) cells under conditions of oxidative injury induced by hydrogen peroxide (H2O2) and to investigate the underlying mechanisms in vitro. METHODS Cell viability was determined by CCK8 assay. Changes in the apoptosis rate, intracellular ROS levels and the mitochondrial membrane potential were measured by flow cytometry. Extracellular matrix (ECM)-related proteins (collagen-2 and aggrecan) and apoptosis-related proteins (Bcl-2, Bax, cytochrome c, and caspase-3) were investigated by western blotting. RESULTS The results show that NP cells pretreated with PQQ before H2O2 exposure exhibited increased cell viability, decreased ROS formation, maintained mitochondrial membrane potential, and reduced apoptosis. In the presence of PQQ, ECM production was maintained by the cells despite being in an apoptotic environment. In addition, pretreatment with PQQ increased the expression of Bcl-2, inhibited the release of mitochondrial cytochrome c, and decreased the expressions of Bax and cleaved caspase-3. CONCLUSIONS Our results suggest that PQQ can protect rat NP cells against oxidative stress via a mitochondria-mediated pathway. PQQ might be useful as a potential pharmaceutical agent in the prevention of intervertebral disc degeneration.
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Affiliation(s)
- Lianjun Yang
- Department of Orthopaedics, Zhu Jiang Hospital, Southern Medical University, No. 253, Gongye Big Road, Guangzhou, 510280, China
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Targeting the extracellular matrix: Matricellular proteins regulate cell–extracellular matrix communication within distinct niches of the intervertebral disc. Matrix Biol 2014; 37:124-30. [DOI: 10.1016/j.matbio.2014.05.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 05/02/2014] [Accepted: 05/03/2014] [Indexed: 01/01/2023]
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Nasto LA, Ngo K, Leme AS, Robinson AR, Dong Q, Roughley P, Usas A, Sowa GA, Pola E, Kang J, Niedernhofer LJ, Shapiro S, Vo NV. Investigating the role of DNA damage in tobacco smoking-induced spine degeneration. Spine J 2014; 14:416-23. [PMID: 24211096 PMCID: PMC3944725 DOI: 10.1016/j.spinee.2013.08.034] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 07/15/2013] [Accepted: 08/23/2013] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Tobacco smoking is a key risk factor for spine degeneration. However, the underlying mechanism by which smoking induces degeneration is not known. Recent studies implicate DNA damage as a cause of spine and intervertebral disc degeneration. Because tobacco smoke contains many genotoxins, we hypothesized that tobacco smoking promotes spine degeneration by inducing cellular DNA damage. PURPOSE To determine if DNA damage plays a causal role in smoking-induced spine degeneration. STUDY DESIGN To compare the effect of chronic tobacco smoke inhalation on intervertebral disc and vertebral bone in normal and DNA repair-deficient mice to determine the contribution of DNA damage to degenerative changes. METHODS Two-month-old wild-type (C57BL/6) and DNA repair-deficient Ercc1(-/Δ) mice were exposed to tobacco smoke by direct inhalation (4 cigarettes/day, 5 days/week for 7 weeks) to model first-hand smoking in humans. Total disc proteoglycan (PG) content (1,9-dimethylmethylene blue assay), PG synthesis ((35)S-sulfate incorporation assay), aggrecan proteolysis (immunoblotting analysis), and vertebral bone morphology (microcomputed tomography) were measured. RESULTS Exposure of wild-type mice to tobacco smoke led to a 19% increase in vertebral porosity and a 61% decrease in trabecular bone volume. Intervertebral discs of smoke-exposed animals also showed a 2.6-fold decrease in GAG content and an 8.1-fold decrease in new PG synthesis. These smoking-induced degenerative changes were similar but not worse in Ercc1(-/Δ) mice. CONCLUSIONS Short-term exposure to high levels of primary tobacco smoke inhalation promotes degeneration of vertebral bone and discs. Disc degeneration is primarily driven by reduced synthesis of proteoglycans needed for vertebral cushioning. Degeneration was not exacerbated in congenic DNA repair-deficient mice, indicating that DNA damage per se does not have a significant causal role in driving smoke-induced spine degeneration.
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Affiliation(s)
- Luigi A Nasto
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, "A. Gemelli" University Hospital, l.go Agostino Gemelli 8, 00168 Roma, Italy
| | - Kevin Ngo
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Adriana S Leme
- Department of Medicine, University of Pittsburgh School of Medicine, 3550 Terrace St, Pittsburgh, PA 15213, USA
| | - Andria R Robinson
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Qing Dong
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Peter Roughley
- McGill Scoliosis and Spine Group, Genetics Unit, Shriners Hospital for Children, Montreal, Quebec H3G 1A6, Canada
| | - Arvydas Usas
- Department of Orthopaedic Surgery of UPMC, Stem Cell Research Center, Pittsburgh, PA 15261, USA
| | - Gwendolyn A Sowa
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Enrico Pola
- Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, "A. Gemelli" University Hospital, l.go Agostino Gemelli 8, 00168 Roma, Italy
| | - James Kang
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Laura J Niedernhofer
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA; Department of Metabolism and Aging, The Scripps Research Institute, 130 Scripps Way #3B3, Jupiter, FL 33458-5284, USA
| | - Steven Shapiro
- Department of Medicine, University of Pittsburgh School of Medicine, 3550 Terrace St, Pittsburgh, PA 15213, USA
| | - Nam V Vo
- Department of Orthopaedic Surgery, Ferguson Laboratory for Orthopaedic Research, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
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Gilbert HTJ, Hoyland JA, Richardson SM. Stem Cell Regeneration of Degenerated Intervertebral Discs: Current Status (Update). Curr Pain Headache Rep 2013; 17:377. [DOI: 10.1007/s11916-013-0377-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Nasto LA, Robinson AR, Ngo K, Clauson CL, Dong Q, St. Croix C, Sowa G, Pola E, Robbins PD, Kang J, Niedernhofer LJ, Wipf P, Vo NV. Mitochondrial-derived reactive oxygen species (ROS) play a causal role in aging-related intervertebral disc degeneration. J Orthop Res 2013; 31:1150-7. [PMID: 23389888 PMCID: PMC3668354 DOI: 10.1002/jor.22320] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 01/05/2013] [Indexed: 02/04/2023]
Abstract
Oxidative damage is a well-established driver of aging. Evidence of oxidative stress exists in aged and degenerated discs, but it is unclear how it affects disc metabolism. In this study, we first determined whether oxidative stress negatively impacts disc matrix metabolism using disc organotypic and cell cultures. Mouse disc organotypic culture grown at atmospheric oxygen (20% O(2)) exhibited perturbed disc matrix homeostasis, including reduced proteoglycan synthesis and enhanced expression of matrix metalloproteinases, compared to discs grown at low oxygen levels (5% O(2)). Human disc cells grown at 20% O(2) showed increased levels of mitochondrial-derived superoxide anions and perturbed matrix homeostasis. Treatment of disc cells with the mitochondria-targeted reactive oxygen species (ROS) scavenger XJB-5-131 blunted the adverse effects caused by 20% O(2). Importantly, we demonstrated that treatment of accelerated aging Ercc1(-/Δ) mice, previously established to be a useful in vivo model to study age-related intervertebral disc degeneration (IDD), also resulted in improved disc total glycosaminoglycan content and proteoglycan synthesis. This demonstrates that mitochondrial-derived ROS contributes to age-associated IDD in Ercc1(-/Δ) mice. Collectively, these data provide strong experimental evidence that mitochondrial-derived ROS play a causal role in driving changes linked to aging-related IDD and a potentially important role for radical scavengers in preventing IDD.
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Affiliation(s)
- Luigi A. Nasto
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
- Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, “A. Gemelli” University Hospital, l.go Agostino Gemelli 8, 00168 Roma, Italy
| | - Andria R. Robinson
- Department of Human Genetics, University of Pittsburgh, Graduate School of Public Health, Pittsburgh, PA 15261, USA
- University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA
| | - Kevin Ngo
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Cheryl L. Clauson
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Qing Dong
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Claudette St. Croix
- Center for Biologic Imaging, Environmental and Occupational Health, Center for Biologic Imaging, University of Pittsburgh, Pittsburgh, PA 15261, USA
| | - Gwendolyn Sowa
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Enrico Pola
- Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, “A. Gemelli” University Hospital, l.go Agostino Gemelli 8, 00168 Roma, Italy
| | - Paul D. Robbins
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - James Kang
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Laura J. Niedernhofer
- University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
| | - Peter Wipf
- Department of Chemistry and Center for Chemical Methodologies and Library Development, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Nam V. Vo
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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Vo N, Niedernhofer LJ, Nasto LA, Jacobs L, Robbins PD, Kang J, Evans CH. An overview of underlying causes and animal models for the study of age-related degenerative disorders of the spine and synovial joints. J Orthop Res 2013; 31:831-7. [PMID: 23483579 PMCID: PMC3628921 DOI: 10.1002/jor.22204] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2011] [Accepted: 07/10/2012] [Indexed: 02/04/2023]
Abstract
As human lifespan increases so does the incidence of age-associated degenerative joint diseases, resulting in significant negative socioeconomic consequences. Osteoarthritis (OA) and intervertebral disc degeneration (IDD) are the most common underlying causes of joint-related chronic disability and debilitating pain in the elderly. Current treatment methods are generally not effective and involve either symptomatic relief with non-steroidal anti-inflammatory drugs and physical therapy or surgery when conservative treatments fail. The limitation in treatment options is due to our incomplete knowledge of the molecular mechanism of degeneration of articular cartilage and disc tissue. Basic understanding of the age-related changes in joint tissue is thus needed to combat the adverse effects of aging on joint health. Aging is caused at least in part by time-dependent accumulation of damaged organelles and macromolecules, leading to cell death and senescence and the eventual loss of multipotent stem cells and tissue regenerative capacity. Studies over the past decades have uncovered a number of important molecular and cellular changes in joint tissues with age. However, the precise causes of damage, cellular targets of damage, and cellular responses to damage remain poorly understood. The objectives of this review are to provide an overview of the current knowledge about the sources of endogenous and exogenous damaging agents and how they contribute to age-dependent degenerative joint disease, and highlight animal models of accelerated aging that could potentially be useful for identifying causes of and therapies for degenerative joint diseases.
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Affiliation(s)
- Nam Vo
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA,Ferguson Laboratory for Orthopaedic Research, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219
| | - Laura J. Niedernhofer
- Department of Microbiology and Molecular Genetics, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219,University of Pittsburgh Cancer Institute, Hillman Cancer Center, 5117 Centre Avenue, Pittsburgh, PA 15213-1863, U.S.A
| | - Luigi Aurelio Nasto
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA,Ferguson Laboratory for Orthopaedic Research, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219
| | - Lloydine Jacobs
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA,Ferguson Laboratory for Orthopaedic Research, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219
| | - Paul D. Robbins
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA,Department of Microbiology and Molecular Genetics, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219,University of Pittsburgh Cancer Institute, Hillman Cancer Center, 5117 Centre Avenue, Pittsburgh, PA 15213-1863, U.S.A
| | - James Kang
- Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA,Ferguson Laboratory for Orthopaedic Research, 523 Bridgeside Point II. 450 Technology Drive, Pittsburgh, PA 15219
| | - Christopher H. Evans
- Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, RN-115, Boston, MA 02215, USA
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Tran CM, Shapiro IM, Risbud MV. Molecular regulation of CCN2 in the intervertebral disc: lessons learned from other connective tissues. Matrix Biol 2013; 32:298-306. [PMID: 23567513 DOI: 10.1016/j.matbio.2013.03.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/28/2013] [Accepted: 03/29/2013] [Indexed: 01/07/2023]
Abstract
Connective tissue growth factor (CCN2/CTGF) plays an important role in extracellular matrix synthesis, especially in skeletal tissues such as cartilage, bone, and the intervertebral disc. As a result there is a growing interest in examining the function and regulation of this important molecule in the disc. This review discusses the regulation of CCN2 by TGF-β and hypoxia, two critical determinants that characterize the disc microenvironment, and discusses known functions of CCN2 in the disc. The almost ubiquitous regulation of CCN2 by TGF-β, including that seen in the disc, emphasizes the importance of the TGF-β-CCN2 relationship, especially in terms of extracellular matrix synthesis. Likewise, the unique cross-talk between CCN2 and HIF-1 in the disc highlights the tissue and niche specific mode of regulation. Taken together the current literature supports an anabolic role for CCN2 in the disc and its involvement in the maintenance of tissue homeostasis during both health and disease. Further studies of CCN2 in this tissue may reveal valuable targets for the biological therapy of disc degeneration.
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Affiliation(s)
- Cassie M Tran
- Department of Orthopaedic Surgery and Graduate Program in Cell and Developmental Biology, Thomas Jefferson University, Philadelphia, USA
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Wang D, Nasto LA, Roughley P, Leme AS, Houghton M, Usas A, Sowa G, Lee J, Niedernhofer L, Shapiro S, Kang J, Vo N. Spine degeneration in a murine model of chronic human tobacco smokers. Osteoarthritis Cartilage 2012; 20:896-905. [PMID: 22531458 PMCID: PMC3389285 DOI: 10.1016/j.joca.2012.04.010] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 03/28/2012] [Accepted: 04/13/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate the mechanisms by which chronic tobacco smoking promotes intervertebral disc degeneration (IDD) and vertebral degeneration in mice. METHODS Three month old C57BL/6 mice were exposed to tobacco smoke by direct inhalation (4 cigarettes/day, 5 days/week for 6 months) to model long-term smoking in humans. Total disc proteoglycan (PG) content [1,9-dimethylmethylene blue (DMMB) assay], aggrecan proteolysis (immunobloting analysis), and cellular senescence (p16INK4a immunohistochemistry) were analyzed. PG and collagen syntheses ((35)S-sulfate and (3)H-proline incorporation, respectively) were measured using disc organotypic culture. Vertebral osteoporosity was measured by micro-computed tomography. RESULTS Disc PG content of smoke-exposed mice was 63% of unexposed control, while new PG and collagen syntheses were 59% and 41% of those of untreated mice, respectively. Exposure to tobacco smoke dramatically increased metalloproteinase-mediated proteolysis of disc aggrecan within its interglobular domain (IGD). Cellular senescence was elevated two-fold in discs of smoke-exposed mice. Smoke exposure increased vertebral endplate porosity, which closely correlates with IDD in humans. CONCLUSIONS These findings further support tobacco smoke as a contributor to spinal degeneration. Furthermore, the data provide a novel mechanistic insight, indicating that smoking-induced IDD is a result of both reduced PG synthesis and increased degradation of a key disc extracellular matrix protein, aggrecan. Cleavage of aggrecan IGD is extremely detrimental as this results in the loss of the entire glycosaminoglycan-attachment region of aggrecan, which is vital for attracting water necessary to counteract compressive forces. Our results suggest identification and inhibition of specific metalloproteinases responsible for smoke-induced aggrecanolysis as a potential therapeutic strategy to treat IDD.
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Affiliation(s)
- Dong Wang
- Beijing Haidian Hospital, Department of Orthopaedics. 29 Zhong-Guan-Cun Street, Beijing 100080, China
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
| | - Luigi A Nasto
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
- Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, “A. Gemelli” University Hospital, l.go Agostino Gemelli 8, 00168 Roma, Italy
| | - Peter Roughley
- Genetics Unit, Shriners Hospital for Children, Montreal, Quebec, Canada
| | - Adriana S. Leme
- University of Pittsburgh School of Medicine, Pittsburgh PA 15213
| | - McGarry Houghton
- University of Pittsburgh School of Medicine, Pittsburgh PA 15213
| | - Arvydas Usas
- Stem Cell Research Center, Department of Orthopaedic Surgery of UPMC, Pittsburgh PA 15261
| | - Gwendolyn Sowa
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
- Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
| | - Joon Lee
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
| | - Laura Niedernhofer
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
| | - Steven Shapiro
- University of Pittsburgh School of Medicine, Pittsburgh PA 15213
| | - James Kang
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
| | - Nam Vo
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh PA 15261
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Liao J, Ke M, Xu T, Lin L. Electroacupuncture inhibits apoptosis in annulus fibrosis cells through suppression of the mitochondria-dependent pathway in a rat model of cervical intervertebral disc degradation. Genet Mol Biol 2012; 35:686-92. [PMID: 23055810 PMCID: PMC3459421 DOI: 10.1590/s1415-47572012005000046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 05/09/2012] [Indexed: 11/22/2022] Open
Abstract
The purpose of this study was to investigate whether treatment with electroacupuncture (EA) inhibited mitochondria-dependent apoptosis in annulus fibrosis (AF) cells in a rat model of cervical intervertebral disc degradation induced by unbalanced dynamic and static forces. Forty Sprague-Dawley rats were used in this study, of which 30 underwent surgery to induce cervical intervertebral disc degradation, 10 rats received EA at acupoints Dazhui (DU 14) and Shousanli (LI 10). TUNEL staining was measured to assess apoptosis in AF cells, immunohistochemistry was used to examine Bcl-2 and Bax expression, colorimetric assays were used to determine caspase 9 and caspase 3 activities and RT-PCR and western blotting were used to assess the mRNA and protein expression of Crk and ERK2. Treatment with EA reduced the number of AF-positive cells in TUNEL staining, increased Bcl-2-positive cells and decreased Bax-positive cells in immunohistochemical staining, significantly inhibited the activation of caspases-9 and -3, and enhanced the mRNA and protein expression of Crk and ERK2. Our data show that EA inhibits AF cell apoptosis via the mitochondria-dependent pathway and up-regulates Crk and ERK2 expression. These results suggest that treatment with may be a good alternative therapy for preventing cervical spondylosis.
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Affiliation(s)
- Jun Liao
- Department of Acupuncture and Moxa and Tuina, Fujian University of Traditional Chinese Medicine, Fujian, P.R. China
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Benz K, Stippich C, Osswald C, Gaissmaier C, Lembert N, Badke A, Steck E, Aicher WK, Mollenhauer JA. Rheological and biological properties of a hydrogel support for cells intended for intervertebral disc repair. BMC Musculoskelet Disord 2012; 13:54. [PMID: 22490206 PMCID: PMC3375205 DOI: 10.1186/1471-2474-13-54] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 04/10/2012] [Indexed: 01/08/2023] Open
Abstract
Background Cell-based approaches towards restoration of prolapsed or degenerated intervertebral discs are hampered by a lack of measures for safe administration and placement of cell suspensions within a treated disc. In order to overcome these risks, a serum albumin-based hydrogel has been developed that polymerizes after injection and anchors the administered cell suspension within the tissue. Methods A hydrogel composed of chemically activated albumin crosslinked by polyethylene glycol spacers was produced. The visco-elastic gel properties were determined by rheological measurement. Human intervertebral disc cells were cultured in vitro and in vivo in the hydrogel and their phenotype was tested by reverse-transcriptase polymerase chain reaction. Matrix production and deposition was monitored by immuno-histology and by biochemical analysis of collagen and glycosaminoglycan deposition. Species specific in situ hybridization was performed to discriminate between cells of human and murine origin in xenotransplants. Results The reproducibility of the gel formation process could be demonstrated. The visco-elastic properties were not influenced by storage of gel components. In vitro and in vivo (subcutaneous implants in mice) evidence is presented for cellular differentiation and matrix deposition within the hydrogel for human intervertebral disc cells even for donor cells that have been expanded in primary monolayer culture, stored in liquid nitrogen and re-activated in secondary monolayer culture. Upon injection into the animals, gels formed spheres that lasted for the duration of the experiments (14 days). The expression of cartilage- and disc-specific mRNAs was maintained in hydrogels in vitro and in vivo, demonstrating the maintenance of a stable specific cellular phenotype, compared to monolayer cells. Significantly higher levels of hyaluronan synthase isozymes-2 and -3 mRNA suggest cell functionalities towards those needed for the support of the regeneration of the intervertebral disc. Moreover, mouse implanted hydrogels accumulated 5 times more glycosaminoglycans and 50 times more collagen than the in vitro cultured gels, the latter instead releasing equivalent quantities of glycosaminoglycans and collagen into the culture medium. Matrix deposition could be specified by immunohistology for collagen types I and II, and aggrecan and was found only in areas where predominantly cells of human origin were detected by species specific in situ hybridization. Conclusions The data demonstrate that the hydrogels form stable implants capable to contain a specifically functional cell population within a physiological environment.
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Affiliation(s)
- Karin Benz
- NMI Natural and Medical Sciences Institute at the University of Tuebingen, Reutlingen, Germany
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Vo N, Wang D, Sowa G, Witt W, Ngo K, Coelho P, Bedison R, Byer B, Studer R, Lee J, Di YP, Kang J. Differential effects of nicotine and tobacco smoke condensate on human annulus fibrosus cell metabolism. J Orthop Res 2011; 29:1585-91. [PMID: 21448984 DOI: 10.1002/jor.21417] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Accepted: 02/28/2011] [Indexed: 02/04/2023]
Abstract
Tobacco smoking increases the risk of intervertebral disc degeneration (IDD) and back pain, but the mechanisms underlying the adverse effects of smoking are largely unknown. Current hypotheses predict that smoking contributes to IDD indirectly through nicotine-mediated vasoconstriction which limits the exchange of nutrients between the discs and their surroundings. We alternatively hypothesize that direct contact of disc cells, that is, cells in the outermost annulus and those present along fissures in degenerating discs, with the vascular system containing soluble tobacco smoking constituents could perturb normal metabolic activities resulting in IDD. In this study, we tested our hypothesis by comparing the effects of direct exposure of human disc cells to tobacco smoke condensate and nicotine on cell viability and metabolic activity. We showed that smoke condensate, which contains all of the water-soluble compounds inhaled by smokers, exerts greater detrimental effects on human disc cell viability and metabolism than nicotine. Smoke condensate greatly induced an inflammatory response and gene expression of metalloproteinases while reduced active matrix synthesis and expression of matrix structural genes. Therefore, we have demonstrated that disc cell exposure to the constituents of tobacco smoke has negative consequences which have the potential to alter disc matrix homeostasis.
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Affiliation(s)
- Nam Vo
- Ferguson Laboratory for Orthopaedic Research, Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
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Smith LJ, Elliott DM. Formation of lamellar cross bridges in the annulus fibrosus of the intervertebral disc is a consequence of vascular regression. Matrix Biol 2011; 30:267-74. [PMID: 21504791 DOI: 10.1016/j.matbio.2011.03.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 03/30/2011] [Accepted: 03/31/2011] [Indexed: 11/30/2022]
Abstract
Cross bridges are radial structures within the highly organized lamellar structure of the annulus fibrosus of the intervertebral disc that connect two or more non-consecutive lamellae. Their origin and function are unknown. During fetal development, blood vessels penetrate deep within the AF and recede during postnatal growth. We hypothesized that cross bridges are the pathways left by these receding blood vessels. Initially, the presence of cross bridges was confirmed in cadaveric human discs aged 25 and 53 years. Next, L1-L2 intervertebral discs (n=4) from sheep ranging in age from 75 days fetal gestation to adult were processed for paraffin histology. Mid-sagittal sections were immunostained for endothelial cell marker PECAM-1. The anterior and posterior AF were imaged using differential interference contrast microscopy, and the following parameters were quantified: total number of distinct lamellae, total number of cross bridges, percentage of cross bridges staining positive for PECAM-1, cross bridge penetration depth (% total lamellae), and PECAM-1 positive cross bridge penetration depth. Cross bridges were first observed at 100 days fetal gestation. The overall number peaked in neonates then remained relatively unchanged. The percentage of PECAM-1 positive cross bridges declined progressively from almost 100% at 100 days gestation to less than 10% in adults. Cross bridge penetration depth peaked in neonates then remained unchanged at subsequent ages. Depth of PECAM-1 positive cross bridges decreased progressively after birth. Findings were similar for both the anterior and posterior. The AF lamellar architecture is established early in development. It later becomes disrupted as a consequence of vascularization. Blood vessels then recede, perhaps due to increasing mechanical stresses in the surrounding matrix. In this study we present evidence that the pathways left by receding blood vessels remain as lamellar cross bridges. It is unclear whether the presence of cross bridges in the aging and degenerating intervertebral disc would be advantageous or detrimental, and this question should be addressed by future studies.
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Affiliation(s)
- Lachlan J Smith
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA
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Xie M, Yang S, Win HL, Xiong L, Huang J, Zhou J. Rabbit annulus fibrosus cell apoptosis induced by mechanical overload via a mitochondrial apoptotic pathway. ACTA ACUST UNITED AC 2010; 30:379-84. [DOI: 10.1007/s11596-010-0361-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Indexed: 12/25/2022]
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O'Donnell JB, Ekman EF, Spalding WM, Bhadra P, McCabe D, Berger MF. The effectiveness of a weak opioid medication versus a cyclo-oxygenase-2 (COX-2) selective non-steroidal anti-inflammatory drug in treating flare-up of chronic low-back pain: results from two randomized, double-blind, 6-week studies. J Int Med Res 2010; 37:1789-802. [PMID: 20146877 DOI: 10.1177/147323000903700615] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Two 6-week studies compared the analgesic efficacy, tolerability and safety of a non-steroidal anti-inflammatory drug (celecoxib 200 mg twice a day [bid]) and an opioid (tramadol HCl 50 mg four times a day [qid]) in subjects with chronic low-back pain (CLBP). Successful responders (primary endpoint) were defined as subjects completing 6 weeks of treatment and having > or = 30% improvement on the Numerical Rating Scale for pain. A total of 796 and 802 subjects were randomized to treatment in study 1 and study 2, respectively. A significantly greater percentage of celecoxib-treated subjects were successful responders compared with tramadol HCl-treated subjects (study 1: 63.2% versus 49.9%, respectively; study 2: 64.1% versus 55.1%, respectively). Fewer adverse events (AEs) and serious AEs were reported in the celecoxib-treated group. Overall, celecoxib 200 mg bid was more effective than tramadol HCl 50 mg qid in the treatment of CLBP, with fewer AEs reported.
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Affiliation(s)
- J B O'Donnell
- Department of Orthopedic Surgery, Union Memorial Hospital, Baltimore, Maryland, USA.
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Tanaka M, Shimizu H, Yato Y, Asazuma T, Nemoto K. Acute pyogenic discitis in a degenerative intervertebral disc in an adult. Int Med Case Rep J 2010; 3:77-80. [PMID: 23754894 PMCID: PMC3658226 DOI: 10.2147/imcrj.s12731] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A 35-year-old male who had been receiving conservative treatment for L4 isthmic spondylolisthesis suffered from pyogenic spondylodiscitis in the degenerative L4/L5 intervertebral disc space, which could be identified by comparison with previous images. Symptoms improved with conservative antibiotic treatment. Neovascularization may occur in the annulus fibrosus of a degenerative intervertebral disc, which may increase the risk of hematogenous infection, leading to "discitis" even in adults.
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Affiliation(s)
- Masamitsu Tanaka
- Department of Orthopedic surgery, National Defense Medical College, Tokorozawa, Saitama ; Department of Orthopedic Surgery, Self Defense Force Fukuoka Hospital, Kasuga, Fukuoka, Japan
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