1
|
Bahar ME, Hwang JS, Ahmed M, Lai TH, Pham TM, Elashkar O, Akter KM, Kim DH, Yang J, Kim DR. Targeting Autophagy for Developing New Therapeutic Strategy in Intervertebral Disc Degeneration. Antioxidants (Basel) 2022; 11:antiox11081571. [PMID: 36009290 PMCID: PMC9405341 DOI: 10.3390/antiox11081571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/11/2022] [Accepted: 08/11/2022] [Indexed: 12/25/2022] Open
Abstract
Intervertebral disc degeneration (IVDD) is a prevalent cause of low back pain. IVDD is characterized by abnormal expression of extracellular matrix components such as collagen and aggrecan. In addition, it results in dysfunctional growth, senescence, and death of intervertebral cells. The biological pathways involved in the development and progression of IVDD are not fully understood. Therefore, a better understanding of the molecular mechanisms underlying IVDD could aid in the development of strategies for prevention and treatment. Autophagy is a cellular process that removes damaged proteins and dysfunctional organelles, and its dysfunction is linked to a variety of diseases, including IVDD and osteoarthritis. In this review, we describe recent research findings on the role of autophagy in IVDD pathogenesis and highlight autophagy-targeting molecules which can be exploited to treat IVDD. Many studies exhibit that autophagy protects against and postpones disc degeneration. Further research is needed to determine whether autophagy is required for cell integrity in intervertebral discs and to establish autophagy as a viable therapeutic target for IVDD.
Collapse
Affiliation(s)
- Md Entaz Bahar
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Jin Seok Hwang
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Mahmoud Ahmed
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Trang Huyen Lai
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Trang Minh Pham
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Omar Elashkar
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Kazi-Marjahan Akter
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, GyeongNam, Korea
| | - Dong-Hee Kim
- Department of Orthopaedic Surgery, Institute of Health Sciences, Gyeongsang National University Hospital and Gyeongsang National University College of Medicine, Jinju 52727, GyeongNam, Korea
| | - Jinsung Yang
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
| | - Deok Ryong Kim
- Department of Biochemistry and Convergence Medical Science, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, GyeongNam, Korea
- Correspondence: ; Tel.: +82-55-772-8054
| |
Collapse
|
2
|
Liu Y, Gao GM, Yang KY, Nong LM. Construction of tissue-engineered nucleus pulposus by stimulation with periodic mechanical stress and BMP-2. iScience 2022; 25:104405. [PMID: 35633940 PMCID: PMC9136668 DOI: 10.1016/j.isci.2022.104405] [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: 02/09/2022] [Revised: 04/22/2022] [Accepted: 05/10/2022] [Indexed: 11/25/2022] Open
Abstract
Intervertebral disc (IVD) degeneration, which is common among elderly individuals, mainly manifests as low back pain and is caused by structural deterioration of the nucleus pulposus (NP) due to physiological mechanical stress. NP mesenchymal stem cells (NPMSCs) around the IVD endplate have multidirectional differentiation potential and can be used for tissue repair. To define favorable conditions for NPMSC proliferation and differentiation into chondroid cells for NP repair, the present study simulated periodic mechanical stress (PMS) of the NP under physiological conditions using MSC chondrogenic differentiation medium and recombinant human BMP-2 (rhBMP-2). rhBMP-2 effectively promoted NPMSC proliferation and differentiation. To clarify the mechanism of action of rhBMP-2, integrin alpha 1 (ITG A1) and BMP-2 were inhibited. PMS regulated the BMP-2/Smad1/RUNX2 pathway through ITG A1 and promoted NPMSC proliferation and differentiation. During tissue-engineered NP construction, PMS can effectively reduce osteogenic differentiation and promote extracellular matrix protein synthesis to enhance structural NP recovery. Extraction of NPMSCs from degenerated nucleus pulposus NPMSCs cultured in vitro by simulating physiological mechanical stress ITG A1 to promote proliferation and differentiation of NPMSCs through BMP-2/Smad1/RUNX2 Injectable tissue-engineered nucleus pulposus
Collapse
|
3
|
Kim KW, Jeong SW, Park HY, Heu JY, Jung HY, Lee JS. The effect of prolonged rhBMP-2 treatment on telomerase activity, replicative capacity and senescence of human nucleus pulposus cells. Biotech Histochem 2020; 95:490-498. [PMID: 32037884 DOI: 10.1080/10520295.2020.1721560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
We investigated the effect of prolonged rhBMP-2 treatment on telomerase activity, replicative capacity and senescence of nucleus pulposus cells (NPCs) during long term culture. We obtained intervertebral disc (IVD) tissues with grade III degeneration from four patients. NPCs were isolated and passaged serially in three groups: control group, low-dose rhBMP-2 group and high-dose rhBMP-2 group until the cells reached the end of their replicative lifespan. Cumulative population doubling level (CPDL), telomerase activity and senescence markers, senescence-associated β-galactosidase (SA-β-gal), p53, p21, and p16, were assessed. The replicative capacity of NPCs in the high-dose rhBMP-2 group was decreased significantly compared to the control and low-dose rhBMP-2 groups. Mean telomerase activity was significantly greater in the high-dose rhBMP-2 group compared to the control and low-dose rhBMP-2 groups. The percentage of SA-β-gal-positive NPCs increased more rapidly in the high-dose rhBMP-2 group with passaging compared to the control and low-dose rhBMP-2 groups. The expression of p53, p21, and p16 in both low and high dose rhBMP-2 groups increased in all passages compared to the control group. We found that prolonged high-dose rhBMP-2 treatment increased telomerase activity of human NPCs, but decreased replicative capacity and lifespan in long term culture. We also found that excessive growth stimulation by prolonged high-dose rhBMP-2 treatment can promote NPCs senescence and result in growth arrest.
Collapse
Affiliation(s)
- Ki-Won Kim
- Department of Orthopedic Surgery, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| | - Seo-Won Jeong
- Department of Orthopedic Research, Medical Research Institute, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| | - Hyung-Youl Park
- Department of Orthopedic Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| | - Jun-Young Heu
- Department of Orthopedic Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| | - Ho-Young Jung
- Department of Orthopedic Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| | - Jun-Seok Lee
- Department of Orthopedic Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea , Seoul, Korea
| |
Collapse
|
4
|
Wang HC, Jin CH, Kong J, Yu T, Guo JW, Hu YG, Liu Y. The research of transgenic human nucleus pulposus cell transplantation in the treatment of lumbar disc degeneration. Kaohsiung J Med Sci 2019; 35:486-492. [PMID: 31091017 DOI: 10.1002/kjm2.12084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 04/21/2019] [Indexed: 01/13/2023] Open
Abstract
The present study determines whether the in vivo injection of TGFβ1 and CTGF mediated by AAV2 to transfect nucleus pulposus cells in degenerative lumbar discs can reverse the biological effects of rhesus lumbar disc degeneration. A total of 42 lumbar discs obtained from six rhesus monkeys were classified into three groups: experimental group, control group, and blank group. Degenerative lumbar discs were respectively injected with double gene-transfected human nucleus pulposus cells using minimally invasive techniques. Immumohistochemical staining, RT-PCR, and western blot were performed to observe the biological effects of double gene-transfected human nucleus pulposus cells in degenerative lumbar discs on rhesus lumbar disc degeneration. At 4, 8, and 12 weeks after the transplantation of nucleus pulposus cells, the expression levels of TGF-ß1, CTGF, proteoglycan mRNA, and type-II collagen were detected by RT-PCR. The values of immumohistochemical staining and RT-PCR in the experimental group increased at 8 weeks, decreased with time at 12 weeks, and remained greater than the values in the control group, and the differences were statistically significant (P < .05). The western blot revealed that the values in the experimental group decreased with time, but remained greater than those in the PBS control group and blank control group, and the differences were statistically significant (P < .05). The double gene-transfection of human nucleus pulposus cells in degenerative lumbar discs mediated by rAAV2 can be continuously expressed in vivo after transplantation in lumbar discs of rhesus monkeys, and promotes the synthesis of proteoglycan and type II collagen, achieving the treatment purpose.
Collapse
Affiliation(s)
- Hua-Cong Wang
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, People's Republic of China
| | - Cang-Hai Jin
- Department of Minimally Invasive Spine Surgery, Qingdao Municipal Hospital, East Branch, Qingdao, Shandong, People's Republic of China
| | - Jie Kong
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, People's Republic of China
| | - Tao Yu
- Department of Orthopedic Surgery, Rushan City People Hospital, Rushan, Shandong, P.R China
| | - Jian-Wei Guo
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, People's Republic of China
| | - You-Gu Hu
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, People's Republic of China
| | - Yong Liu
- Department of Orthopedic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, People's Republic of China
| |
Collapse
|
5
|
Hodgkinson T, Shen B, Diwan A, Hoyland JA, Richardson SM. Therapeutic potential of growth differentiation factors in the treatment of degenerative disc diseases. JOR Spine 2019; 2:e1045. [PMID: 31463459 PMCID: PMC6686806 DOI: 10.1002/jsp2.1045] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 01/16/2019] [Accepted: 02/04/2019] [Indexed: 02/06/2023] Open
Abstract
Intervertebral disc (IVD) degeneration is a major contributing factor to chronic low back pain and disability, leading to imbalance between anabolic and catabolic processes, altered extracellular matrix composition, loss of tissue hydration, inflammation, and impaired mechanical functionality. Current treatments aim to manage symptoms rather than treat underlying pathology. Therefore, IVD degeneration is a target for regenerative medicine strategies. Research has focused on understanding the molecular process of degeneration and the identification of various factors that may have the ability to halt and even reverse the degenerative process. One such family of growth factors, the growth differentiation factor (GDF) family, have shown particular promise for disc regeneration in in vitro and in vivo models of IVD degeneration. This review outlines our current understanding of IVD degeneration, and in this context, aims to discuss recent advancements in the use of GDF family members as anabolic factors for disc regeneration. An increasing body of evidence indicates that GDF family members are central to IVD homeostatic processes and are able to upregulate healthy nucleus pulposus cell marker genes in degenerative cells, induce mesenchymal stem cells to differentiate into nucleus pulposus cells and even act as chemotactic signals mobilizing resident cell populations during disc injury repair. The understanding of GDF signaling and its interplay with inflammatory and catabolic processes may be critical for the future development of effective IVD regeneration therapies.
Collapse
Affiliation(s)
- Tom Hodgkinson
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of ManchesterManchester Academic Health Sciences CentreManchesterUK
- Centre for the Cellular Microenvironment, Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life SciencesUniversity of GlasgowGlasgowUK
| | - Bojiang Shen
- St. George Clinical SchoolUniversity of New South WalesSydneyNew South WalesAustralia
| | - Ashish Diwan
- St. George Clinical SchoolUniversity of New South WalesSydneyNew South WalesAustralia
| | - Judith A. Hoyland
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of ManchesterManchester Academic Health Sciences CentreManchesterUK
- NIHR Manchester Biomedical Research Centre, Manchester University Foundation TrustManchester Academic Health Sciences CentreManchesterUK
| | - Stephen M. Richardson
- Division of Cell Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of ManchesterManchester Academic Health Sciences CentreManchesterUK
| |
Collapse
|
6
|
Yuan D, Chen Z, Xiang X, Deng S, Liu K, Xiao D, Deng L, Feng G. The establishment and biological assessment of a whole tissue-engineered intervertebral disc with PBST fibers and a chitosan hydrogel in vitro and in vivo. J Biomed Mater Res B Appl Biomater 2019; 107:2305-2316. [PMID: 30680915 DOI: 10.1002/jbm.b.34323] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 12/29/2018] [Accepted: 01/02/2019] [Indexed: 12/27/2022]
Abstract
Intervertebral disc (IVD) degeneration (IDD) is the main cause of low back pain in the clinic. In the advanced stage of IDD, both cell transplantation and gene therapy have obvious limitations. At this stage, tissue-engineered IVDs (TE-IVDs) provide new hope for the treatment of this disease. We aimed to construct a TE-IVD with a relatively complete structure. The inner annulus fibrosus (AF) was constructed using poly (butylene succinate-co-terephthalate) copolyester (PBST) electrospun fibers, and the outer AF consisted of solid PBST. The nucleus pulposus (NP) scaffold was constructed using a chitosan hydrogel, as reported in our previous research. The three components were assembled in vitro, and the mechanical properties were analyzed. AF and NP cells were implanted on the corresponding scaffolds. Then, the cell-seeded scaffolds were implanted subcutaneously in nude mice and cultured for 4 weeks; then they were removed and implanted into New Zealand white rabbits. After 4 weeks, their properties were analyzed. The PBST outer AF provided mechanical support for the whole TE-IVD. The electrospun film and chitosan hydrogel simulated the natural structure of the IVD well. Its mechanical property could meet the requirement of the normal IVD. Four weeks later, X-ray and MR imaging examination results suggested that the height of the intervertebral space was retained. The cells on the TE-IVD expressed extracellular matrix, which indicated that the cells maintained their biological function. Therefore, we conclude that the whole TE-IVD has biological and biomechanical properties to some extent, which is a promising candidate for IVD replacement therapies. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 2305-2316, 2019.
Collapse
Affiliation(s)
- Dechao Yuan
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China.,Department of Orthopedics, Zigong No.4 People's Hospital, Zigong, Sichuan, 643000, People's Republic of China
| | - Zhu Chen
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Xiaocong Xiang
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Shang Deng
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Kang Liu
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Donqin Xiao
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Li Deng
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| | - Gang Feng
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital, The Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan, 637000, People's Republic of China
| |
Collapse
|
7
|
Wang Y, Jiang L, Dai G, Li S, Mu X. Bioinformatics analysis reveals different gene expression patterns in the annulus fibrosis and nucleus pulpous during intervertebral disc degeneration. Exp Ther Med 2018; 16:5031-5040. [PMID: 30542457 PMCID: PMC6257805 DOI: 10.3892/etm.2018.6884] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 09/21/2018] [Indexed: 12/18/2022] Open
Abstract
Degeneration of the intervertebral disc (IVD), which consists of the annulus fibrosus (AF) and nucleus pulposus (NP), is a multifactorial physiological process associated with lower back pain. Despite decades of research, the knowledge of the underlying molecular mechanisms of IVD degeneration (IDD) has remained limited. The present study aimed to reveal the differential gene expression patterns in AF and NP during the process of IDD and to identify key biomarkers contributing to these differences. The microarray dataset GSE70362 containing 24 AF and 24 NP samples was retrieved from the Gene Expression Omnibus database. Of these, 8 healthy samples were discarded. GeneSpring11.5 software was employed to identify differentially expressed genes (DEGs). Metascape online tools were used to perform enrichment analyses. Finally, the DEGs were mapped with the Search Tool for the Retrieval of Interacting Genes, and a protein-protein interaction (PPI) network was constructed in Cytoscape software. A total of 87 DEGs were identified. Gene ontology enrichment revealed that these DEGs were mainly involved in the inflammatory response, the extracellular matrix and RNA polymerase II transcription factor activity. Pathway enrichment revealed that the DEGs were mainly involved in the transforming growth factor (TGF-β) and estrogen signaling pathways. Matrix metalloproteinase (MMP)1 and interleukin (IL)6 were included in the genes enriched in rheumatoid arthritis, whereas bone morphogenetic protein (BMP)2 and thrombospondin 1 (THBS1) were among the genes enriched in the TGF-β signaling pathway. In the PPI network, IL6 was identified as the central gene. In conclusion, as MMP1 has been demonstrated degrade collagen III at higher rates compared with other types of collagen (which is at a higher quantity in AF than NP), collagen types may be in different distribution patterns, which may contribute to the upregulation of MMP1 in AF. Differences in the expression of BMP2, ESR1 and THBS1 may explain for the pathological differences between AF and NP. IL6 may have a key role in different degeneration processes in AF and NP.
Collapse
Affiliation(s)
- Yi Wang
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Ling Jiang
- College Hospital, Sichuan Agricultural University, Chengdu, Sichuan 611130, P.R. China
| | - Guogang Dai
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Shengwu Li
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| | - Xiaoyuan Mu
- Cervicodynia/Omalgia/Lumbago/Sciatica Department 2, Sichuan Provincial Orthopedic Hospital, Chengdu, Sichuan 610041, P.R. China
| |
Collapse
|
8
|
Bach FC, Miranda-Bedate A, van Heel FW, Riemers FM, Müller MC, Creemers LB, Ito K, Benz K, Meij BP, Tryfonidou MA. Bone Morphogenetic Protein-2, But Not Mesenchymal Stromal Cells, Exert Regenerative Effects on Canine and Human Nucleus Pulposus Cells. Tissue Eng Part A 2017; 23:233-242. [DOI: 10.1089/ten.tea.2016.0251] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Affiliation(s)
- Frances C. Bach
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Alberto Miranda-Bedate
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Ferdi W.M. van Heel
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Frank M. Riemers
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Margot C.M.E. Müller
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Laura B. Creemers
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Keita Ito
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | | | - Björn P. Meij
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Marianna A. Tryfonidou
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| |
Collapse
|
9
|
Li Z, Lang G, Karfeld-Sulzer LS, Mader KT, Richards RG, Weber FE, Sammon C, Sacks H, Yayon A, Alini M, Grad S. Heterodimeric BMP-2/7 for nucleus pulposus regeneration-In vitro and ex vivo studies. J Orthop Res 2017; 35:51-60. [PMID: 27340938 DOI: 10.1002/jor.23351] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 06/20/2016] [Indexed: 02/04/2023]
Abstract
Intervertebral disc (IVD) degeneration is the leading trigger of low back pain, which causes disability and leads to enormous healthcare toll worldwide. Biological treatment with growth factors has evolved as potential therapy for IVD regeneration. Bone morphogenetic protein 2 (BMP-2) and BMP-7 have shown promise in this regard. In the current study, we evaluated the effect of BMP-2/7 heterodimer for disc regeneration both in vitro and in organ culture. Nucleus pulposus (NP) cells isolated from bovine caudal disc were cultured in a fibrin-hyaluronan (FBG-HA) hydrogel for up to 14 days. BMP-2/7 heterodimer covalently incorporated within the hydrogel up-regulated the aggrecan and type II collagen gene expression, and glycosaminoglycan synthesis of NP cells. The activity of the BMP-2/7 heterodimer was dose dependent. The higher dose of BMP-2/7 was further assessed in an IVD whole organ system. After 14 days of culture with cyclic dynamic load, the BMP-2/7 heterodimer delivered into the nucleotomized region showed potential to stimulate the gene expression and synthesis of proteoglycan in the remaining NP tissue after partial nucleotomy. The gene expression level of type I collagen and alkaline phosphatase in the native disc tissue were not affected by BMP-2/7 treatment, indicating no adverse fibroblastic or osteogenic effect on the disc tissue. Intradiscal delivery of BMP-2/7 heterodimer may be a promising therapeutic approach for NP regeneration. The current IVD whole organ partial nucleotomy model may be utilized for screening of other biomaterials or drugs to treat early degenerative disc disorders. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:51-60, 2017.
Collapse
Affiliation(s)
- Zhen Li
- AO Research Institute Davos, Clavadelerstrasse 8, Davos 7270, Switzerland
| | - Gernot Lang
- AO Research Institute Davos, Clavadelerstrasse 8, Davos 7270, Switzerland
| | - Lindsay S Karfeld-Sulzer
- Oral Biotechnology & Bioengineering, Center for Dental Medicine, Cranio-Maxillofacial and Oral Surgery, University of Zurich, Switzerland
| | | | - R Geoff Richards
- AO Research Institute Davos, Clavadelerstrasse 8, Davos 7270, Switzerland
| | - Franz E Weber
- Oral Biotechnology & Bioengineering, Center for Dental Medicine, Cranio-Maxillofacial and Oral Surgery, University of Zurich, Switzerland
| | - Chris Sammon
- Sheffield Hallam University, Sheffield, United Kingdom
| | | | | | - Mauro Alini
- AO Research Institute Davos, Clavadelerstrasse 8, Davos 7270, Switzerland
| | - Sibylle Grad
- AO Research Institute Davos, Clavadelerstrasse 8, Davos 7270, Switzerland
| |
Collapse
|
10
|
Shao J, Yu M, Jiang L, Wu F, Liu X. Sequencing and bioinformatics analysis of the differentially expressed genes in herniated discs with or without calcification. Int J Mol Med 2017; 39:81-90. [PMID: 27959380 PMCID: PMC5179188 DOI: 10.3892/ijmm.2016.2821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 12/01/2016] [Indexed: 12/27/2022] Open
Abstract
The purpose of this study was to detect the differentially expressed genes between ossified herniated discs and herniated discs without ossification. In addition, we sought to identify a few candidate genes and pathways by using bioinformatics analysis. We analyzed 6 samples each of ossified herniated discs (experimental group) and herniated discs without ossification (control group). Purified mRNA and cDNA extracted from the samples were subjected to sequencing. The NOISeq method was used to statistically identify the differentially expressed genes (DEGs) between the 2 groups. An in-depth analysis using bioinformatics tools based on the DEGs was performed using Gene Ontology (GO) enrichment, Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment, and protein-protein interaction network analysis. The top 6 DEGs were verified using reverse transcription-quantitative polymerase chain reaction (RT-qPCR). A total of 132 DEGs was detected. A total of 129 genes in the ossified group were upregulated and 3 genes were found to be downregulated as compared to the control group. The top 3 cellular components in GO ontologies analysis were extracellular matrix components. GO functions were mainly related to the glycoprotein in the cell membrane and extracellular matrix. The GO process was related to completing response to stimulus, immune reflex and defense. The top 5 KEGG enrichment pathways were associated with infection and inflammation. Three of the top 20 DEGs [sclerostin (SOST), WNT inhibitory factor 1 (WIF1) and secreted frizzled related protein 4 (SFRP4)] were related to the inhibition of the Wnt pathway. The ossified discs exhibited a higher expression of the top 6 DEGs [SOST, joining chain of multimeric IgA and IgM (IGJ; also known as JCHAIN), defensin alpha 4 (DEFA4), SFRP4, proteinase 3 (PRTN3) and cathepsin G (CTSG)], with the associated P-values of 0.045, 0.000, 0.008, 0.010, 0.015 and 0.002, respectively, as calculated by the independent sample t-test. The gene expression profiling of the 2 groups revealed differential gene expression. Thus, our data suggest that Wnt pathway abnormality and local inflammation may be related to disc ossification.
Collapse
Affiliation(s)
- Jia Shao
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Miao Yu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Liang Jiang
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Fengliang Wu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, P.R. China
| | - Xiaoguang Liu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, P.R. China
| |
Collapse
|
11
|
Ye S, Ju B, Wang H, Lee KB. Bone morphogenetic protein-2 provokes interleukin-18-induced human intervertebral disc degeneration. Bone Joint Res 2016; 5:412-8. [PMID: 27669712 PMCID: PMC5037967 DOI: 10.1302/2046-3758.59.bjr-2016-0032.r1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 07/11/2016] [Indexed: 01/03/2023] Open
Abstract
OBJECTIVES Interleukin 18 (IL-18) is a regulatory cytokine that degrades the disc matrix. Bone morphogenetic protein-2 (BMP-2) stimulates synthesis of the disc extracellular matrix. However, the combined effects of BMP-2 and IL-18 on human intervertebral disc degeneration have not previously been reported. The aim of this study was to investigate the effects of the anabolic cytokine BMP-2 and the catabolic cytokine IL-18 on human nucleus pulposus (NP) and annulus fibrosus (AF) cells and, therefore, to identify potential therapeutic and clinical benefits of recombinant human (rh)BMP-2 in intervertebral disc degeneration. METHODS Levels of IL-18 were measured in the blood of patients with intervertebral disc degenerative disease and in control patients. Human NP and AF cells were cultured in a NP cell medium and treated with IL-18 or IL-18 plus BMP-2. mRNA levels of target genes were measured by real-time polymerase chain reaction, and protein levels of aggrecan, type II collagen, SOX6, and matrix metalloproteinase 13 (MMP13) were assessed by western blot analysis. RESULTS The serum level of patients (IL-18) increased significantly with the grade of IVD degeneration. There was a dramatic alteration in IL-18 level between the advanced degeneration (Grade III to V) group and the normal group (p = 0.008) Furthermore, IL-18 induced upregulation of the catabolic regulator MMP13 and downregulation of the anabolic regulators aggrecan, type II collagen, and SOX6 at 24 hours, contributing to degradation of disc matrix enzymes. However, BMP-2 antagonised the IL-18 induced upregulation of aggrecan, type II collagen, and SOX6, resulting in reversal of IL-18 mediated disc degeneration. CONCLUSIONS BMP-2 is anti-catabolic in human NP and AF cells, and its effects are partially mediated through provocation of the catabolic effect of IL-18. These findings indicate that BMP-2 may be a unique therapeutic option for prevention and reversal of disc degeneration.Cite this article: S. Ye, B. Ju, H. Wang, K-B. Lee. Bone morphogenetic protein-2 provokes interleukin-18-induced human intervertebral disc degeneration. Bone Joint Res 2016;5:412-418. DOI: 10.1302/2046-3758.59.BJR-2016-0032.R1.
Collapse
Affiliation(s)
- S Ye
- Department of Orthopaedic Surgery, Chonbuk National University Medical School, Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research, Institute of Chonbuk National University Hospital, Jeonju, Korea
| | - B Ju
- Department of Orthopaedic Surgery, Chonbuk National University Medical School, Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research, Institute of Chonbuk National University Hospital, Jeonju, Korea
| | - H Wang
- Chonbuk National University Medical School, Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research, Institute of Chonbuk National University Hospital, Jeonju, Korea
| | - K-B Lee
- Department of Orthopaedic Surgery, Chonbuk National University Medical School, Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research, Institute of Chonbuk National University Hospital, Jeonju, Korea
| |
Collapse
|
12
|
Shao J, Yu M, Jiang L, Wei F, Wu F, Liu Z, Liu X. Differences in calcification and osteogenic potential of herniated discs according to the severity of degeneration based on Pfirrmann grade: a cross-sectional study. BMC Musculoskelet Disord 2016; 17:191. [PMID: 27495942 PMCID: PMC4974757 DOI: 10.1186/s12891-016-1015-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 04/07/2016] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Herniated discs may exhibit calcification, and calcified discs may complicate surgical treatment. However, the osteogenic potential and expression of osteogenic markers in degenerative discs of different degenerative grades are still unclear. Our purposes are to study the differences in calcification rate and osteogenic potential of herniated discs according to different degenerative grades. METHODS Fifty-eight lumbar intervertebral discs were removed from 41 patients. After grading according to the Pfirrmann scale, calcification was analyzed by micro computed tomography (μ-CT), and expression of osteogenic markers was analyzed by immunohistochemistry and real-time quantitative polymerase chain reaction (qPCR). Data from μ-CT scans were compared with the Kruskal-Wallis test. The Mann-Whitney test was applied to compare data between any two groups. Differences in osteogenic mRNA expression in different regions of the removed discs (posterior vs. anterior) were analyzed by paired t tests. Differences in the posterior portion of removed discs of different Pfirrmann grades were analyzed by one-way analysis of variance (ANOVA), and comparisons of data between discs of any two grades were completed with least significant difference (LSD) tests. RESULTS Significant differences in calcification according to μ-CT scanning were observed between discs of different degenerative grades. Nearly half of the discs of Pfirrmann grade V showed the highest degree of calcification compared to Pfirrman grade II discs. Bone morphogenetic protein (BMP)-2, Osterix, and Osteocalcin were detected histologically in discs of Pfirrmann grades III-V. Alkaline phosphatase (ALP) expression was observed in discs showing evidence of calcification. The qPCR analysis showed that BMP-2, Osterix, and Osteocalcin were expressed in most degenerated discs. We also observed greater expression of these osteogenic markers in the posterior portion of removed discs than in the anterior portion. CONCLUSIONS The osteogenic potential of degenerated intervertebral discs appears to increase with the severity of degeneration and to be greater in the tissue near the spinal canal than in tissue in the inner portion of the disc.
Collapse
Affiliation(s)
- Jia Shao
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Miao Yu
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Liang Jiang
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Feng Wei
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Fengliang Wu
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Zhongjun Liu
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| | - Xiaoguang Liu
- Department of Orthopedics, Peking University Third Hospital, No. 49, North Garden Rd, Beijing, HaiDian District 100191 China
| |
Collapse
|
13
|
Abstract
The intervertebral disc is a complex structure responsible for flexibility, multi-axial motion, and load transmission throughout the spine. Importantly, degeneration of the intervertebral disc is thought to be an initiating factor for back pain. Due to a lack of understanding of the pathways that govern disc degeneration, there are currently no disease-modifying treatments to delay or prevent degenerative disc disease. This review presents an overview of our current understanding of the developmental processes that regulate intervertebral disc formation, with particular emphasis on the role of the notochord and notochord-derived cells in disc homeostasis and how their loss can result in degeneration. We then describe the role of small animal models in understanding the development of the disc and their use to interrogate disc degeneration and associated pathologies. Finally, we highlight essential development pathways that are associated with disc degeneration and/or implicated in the reparative response of the tissue that might serve as targets for future therapeutic approaches.
Collapse
|
14
|
Feng C, Zhang Y, Yang M, Huang B, Zhou Y. Collagen-DerivedN-Acetylated Proline-Glycine-Proline in Intervertebral Discs Modulates CXCR1/2 Expression and Activation in Cartilage Endplate Stem Cells to Induce Migration and Differentiation Toward a Pro-Inflammatory Phenotype. Stem Cells 2015; 33:3558-68. [PMID: 26302999 DOI: 10.1002/stem.2200] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/05/2015] [Accepted: 07/25/2015] [Indexed: 01/07/2023]
Affiliation(s)
- Chencheng Feng
- Department of Orthopedics, Xinqiao Hospital; Third Military Medical University; Chongqing People's Republic of China
| | - Yang Zhang
- Department of Orthopedics, Xinqiao Hospital; Third Military Medical University; Chongqing People's Republic of China
| | - Minghui Yang
- Department of Orthopedics, Xinqiao Hospital; Third Military Medical University; Chongqing People's Republic of China
| | - Bo Huang
- Department of Orthopedics, Xinqiao Hospital; Third Military Medical University; Chongqing People's Republic of China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital; Third Military Medical University; Chongqing People's Republic of China
| |
Collapse
|
15
|
Peeters M, Detiger SEL, Karfeld-Sulzer LS, Smit TH, Yayon A, Weber FE, Helder MN. BMP-2 and BMP-2/7 Heterodimers Conjugated to a Fibrin/Hyaluronic Acid Hydrogel in a Large Animal Model of Mild Intervertebral Disc Degeneration. Biores Open Access 2015; 4:398-406. [PMID: 26543683 PMCID: PMC4623986 DOI: 10.1089/biores.2015.0025] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Intervertebral disc (IVD) degeneration is etiologically associated with low back pain and is currently only treated in severe cases with spinal fusion. Regenerative medicine attempts to restore degenerated tissue by means of cells, hydrogels, and/or growth factors and can therefore be used to slow, halt, or reverse the degeneration of the IVD in a minimally invasive manner. Previously, the growth factors bone morphogenetic proteins 2 and 7 (BMP-2, -7) were shown to enhance disc regeneration, in vitro and in vivo. Since BMPs have only a short in vivo half-life, and to prevent heterotopic ossification, we evaluated the use of a slow release system for BMP-2 homodimers and BMP-2/7 heterodimers for IVD regeneration. BMP growth factors were conjugated to a fibrin/hyaluronic acid (FB/HA) hydrogel and intradiscally injected in a goat model of mild IVD degeneration to study safety and efficacy. Mild degeneration was induced in five lumbar discs of seven adult Dutch milk goats, by injections with the enzyme chondroitinase ABC. After 12 weeks, discs were treated with either FB/HA-hydrogel only or supplemented with 1 or 5 μg/mL of BMP-2 or BMP-2/7. BMPs were linked to the FB/HA hydrogels using a transglutaminase moiety, to be released through an incorporated plasmin cleavage site. After another 12 weeks, goats were sacrificed and discs were assessed using radiography, MRI T2* mapping, and biochemical and histological analyses. All animals maintained weight throughout the study and no heterotopic bone formation or other adverse effects were noted during follow-up. Radiographs showed significant disc height loss upon induction of mild degeneration. MRI T2* mapping showed strong and significant correlations with biochemistry and histology as shown before. Surprisingly, no differences could be demonstrated in any parameter between intervention groups. To our knowledge, this is the first large animal study evaluating BMPs conjugated to an FB/HA-hydrogel for the treatment of mild IVD degeneration. The conjugated BMP-2 and BMP-2/7 appeared safe, but no disc regeneration was observed. Possible explanations include too low dosages, short follow-up time, and/or insufficient release of the conjugated BMPs. These aspects should be addressed in future studies.
Collapse
Affiliation(s)
- Mirte Peeters
- Department of Orthopaedic Surgery, VU University Medical Center , Amsterdam, The Netherlands . ; Center for Translational Regenerative Medicine (CTRM), MOVE Research Institute Amsterdam , Amsterdam, The Netherlands
| | - Suzanne E L Detiger
- Department of Orthopaedic Surgery, VU University Medical Center , Amsterdam, The Netherlands . ; Center for Translational Regenerative Medicine (CTRM), MOVE Research Institute Amsterdam , Amsterdam, The Netherlands
| | | | - Theo H Smit
- Department of Orthopaedic Surgery, VU University Medical Center , Amsterdam, The Netherlands . ; Center for Translational Regenerative Medicine (CTRM), MOVE Research Institute Amsterdam , Amsterdam, The Netherlands
| | - Avner Yayon
- ProCore Biomed Ltd. , Weizman Science Park, Nes Ziona, Israel
| | - Franz E Weber
- University Hospital , Cranio-Maxillofacial and Oral Surgery/Bioengineering, Zürich, Switzerland
| | - Marco N Helder
- Department of Orthopaedic Surgery, VU University Medical Center , Amsterdam, The Netherlands . ; Center for Translational Regenerative Medicine (CTRM), MOVE Research Institute Amsterdam , Amsterdam, The Netherlands
| |
Collapse
|
16
|
Belykh E, Giers M, Bardonova L, Theodore N, Preul M, Byvaltsev V. The Role of Bone Morphogenetic Proteins 2, 7, and 14 in Approaches for Intervertebral Disk Restoration. World Neurosurg 2015; 84:871-3. [PMID: 26299263 DOI: 10.1016/j.wneu.2015.08.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Evgenii Belykh
- Irkutsk Scientific Center of Surgery and Traumatology, Irkutsk, Russia; Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Morgan Giers
- Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Liudmila Bardonova
- Irkutsk Scientific Center of Surgery and Traumatology, Irkutsk, Russia; Irkutsk State Medical University, Irkutsk, Russia
| | - Nicholas Theodore
- Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Mark Preul
- Division of Neurological Surgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Vadim Byvaltsev
- Irkutsk Scientific Center of Surgery and Traumatology, Irkutsk, Russia; Irkutsk State Medical University, Irkutsk, Russia; Railway Clinical Hospital, Irkutsk-Passazhirskiy Station of Russian Railways Ltd., Irkutsk, Russia
| |
Collapse
|
17
|
Kadow T, Sowa G, Vo N, Kang JD. Molecular basis of intervertebral disc degeneration and herniations: what are the important translational questions? Clin Orthop Relat Res 2015; 473:1903-12. [PMID: 25024024 PMCID: PMC4418989 DOI: 10.1007/s11999-014-3774-8] [Citation(s) in RCA: 163] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Intervertebral disc degeneration is a common condition with few inexpensive and effective modes of treatment, but current investigations seek to clarify the underlying process and offer new treatment options. It will be important for physicians to understand the molecular basis for the pathology and how it translates to developing clinical treatments for disc degeneration. In this review, we sought to summarize for clinicians what is known about the molecular processes that causes disc degeneration. RESULTS A healthy disc requires maintenance of a homeostatic environment, and when disrupted, a catabolic cascade of events occurs on a molecular level resulting in upregulation of proinflammatory cytokines, increased degradative enzymes, and a loss of matrix proteins. This promotes degenerative changes and occasional neurovascular ingrowth potentially contributing to the development of pain. Research demonstrates the molecular changes underlying the harmful effects of aging, smoking, and obesity seen clinically while demonstrating the variable influence of exercise. Finally, oral medications, supplements, biologic treatments, gene therapy, and stem cells hold great promise but require cautious application until their safety profiles are better outlined. CONCLUSIONS Intervertebral disc degeneration occurs where there is a loss of homeostatic balance with a predominantly catabolic metabolic profile. A basic understanding of the molecular changes occurring in the degenerating disc is important for practicing clinicians because it may help them to inform patients to alter lifestyle choices, identify beneficial or harmful supplements, or offer new biologic, genetic, or stem cell therapies.
Collapse
Affiliation(s)
- Tiffany Kadow
- />Ferguson Laboratory for Orthopaedic and Spine Research, Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, University of Pittsburgh, E1641 Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15261 USA
| | - Gwendolyn Sowa
- />Ferguson Laboratory for Orthopaedic and Spine Research, Department of Physical Medicine and Rehabilitation, University of Pittsburgh Medical Center, University of Pittsburgh, Pittsburgh, PA USA
| | - Nam Vo
- />Ferguson Laboratory for Orthopaedic and Spine Research, Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, University of Pittsburgh, E1641 Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15261 USA
| | - James D. Kang
- />Ferguson Laboratory for Orthopaedic and Spine Research, Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, University of Pittsburgh, E1641 Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15261 USA
| |
Collapse
|
18
|
Yu SM, Kim SJ. Withaferin A-caused production of intracellular reactive oxygen species modulates apoptosis via PI3K/Akt and JNKinase in rabbit articular chondrocytes. J Korean Med Sci 2014; 29:1042-53. [PMID: 25120312 PMCID: PMC4129194 DOI: 10.3346/jkms.2014.29.8.1042] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 05/12/2014] [Indexed: 11/20/2022] Open
Abstract
Withaferin A (WFA) is known as a constituent of Ayurvedic medicinal plant, Withania somnifera, and has been used for thousands of years. Although WFA has been used for the treatment of osteoarthritis (OA) and has a wide range of biochemical and pharmacologic activities, there are no findings suggesting its properties on chondrocytes or cartilage. The aim of the present study is to investigate the effects of WFA on apoptosis with focus on generation of intracellular reactive oxygen species (ROS). Here we showed that WFA significantly increased the generation of intracellular ROS in a dose-dependent manner. We also determined that WFA markedly leads to apoptosis as evidenced by accumulation of p53 by Western blot analysis. N-Acetyl-L-Cystein (NAC), an antioxidant, prevented WFA-caused expression of p53 and inhibited apoptosis of chondrocytes. We also found that WFA causes the activation of PI3K/Akt and JNKinase. Inhibition of PI3K/Akt and JNKinase with LY294002 (LY)/triciribine (TB) or SP600125 (SP) in WFA-treated cells reduced accumulation of p53 and inhibited fragmented DNA. Our findings suggested that apoptosis caused by WFA-induced intracellular ROS generation is regulated through PI3K/Akt and JNKinase in rabbit articular chondrocytes.
Collapse
Affiliation(s)
- Seon-Mi Yu
- Department of Biological Sciences, Kongju National University, Gongju, Korea
| | - Song-Ja Kim
- Department of Biological Sciences, Kongju National University, Gongju, Korea
| |
Collapse
|
19
|
Migration inhibitory factor enhances inflammation via CD74 in cartilage end plates with Modic type 1 changes on MRI. Clin Orthop Relat Res 2014; 472:1943-54. [PMID: 24569872 PMCID: PMC4016425 DOI: 10.1007/s11999-014-3508-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 02/04/2014] [Indexed: 01/31/2023]
Abstract
BACKGROUND Type 1 Modic changes are characterized by edema, vascularization, and inflammation, which lead to intervertebral disc degeneration. Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine closely related to the inflammatory cytokines detected in degenerative intervertebral disc tissues. However, the existence and role of MIF and its receptor CD74 in intervertebral disc degeneration have not been elucidated. QUESTIONS/PURPOSES We asked whether (1) MIF and its receptor CD74 are expressed in cartilage end plates with Type 1 Modic changes, (2) MIF is associated with cartilage end plate degeneration, (3) the MIF antagonist (S, R)-3(4-hydroxyphenyl)-4, 5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1) suppresses MIF-induced inflammatory cytokine release, and (4) inflammatory cytokines are released by cartilage end plate chondrocytes via CD74 by activating the CD74 antibody (CD74Ab). METHODS We examined MIF and CD74 expression by human cartilage end plate chondrocytes and tissues with Type 1 Modic changes from eight patients using immunocytofluorescence and immunohistochemistry. MIF production by the chondrocytes was assessed by ELISA and PCR. We compared cytokine release by chondrocytes treated with MIF in the presence or absence of exogenous ISO-1 by ELISA. Cytokine release by chondrocytes after treatment with CD74Ab was determined by ELISA. RESULTS MIF was expressed in degenerated human cartilage end plate tissues and chondrocytes. Lipopolysaccharide and tumor necrosis factor α (TNF-α) upregulated MIF expression and increased MIF secretion in chondrocytes in a dose-dependent manner. MIF increased the secretion of IL-6, IL-8, and prostaglandin E2 (PGE2) in a dose-dependent manner. ISO-1 reduced the secretion of IL-6, IL-8, and PGE2. CD74Ab activated CD74 and induced release of inflammatory cytokines. CONCLUSIONS Chondrocytes in cartilage end plate with Type 1 Modic changes express MIF and its receptor CD74. MIF might promote the inflammatory response through CD74. MIF-induced cytokine release appears to be suppressed by ISO-1, and CD74Ab could induce cytokine release. CLINICAL RELEVANCE The MIF/CD74 pathway may represent a crucial target for treating disc degeneration since inhibiting the function of MIF with its antagonist ISO-1 can reduce MIF-induced inflammation and exert potent therapeutic effects.
Collapse
|
20
|
Platelet-rich plasma induces annulus fibrosus cell proliferation and matrix production. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2014; 23:745-53. [PMID: 24469887 DOI: 10.1007/s00586-014-3198-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 01/13/2014] [Accepted: 01/14/2014] [Indexed: 12/28/2022]
Abstract
PURPOSE Platelet-rich plasma (PRP) contains growth factors and creates a 3D structure upon clotting; PRP or platelet lysate (PL) might be considered for annulus fibrosus (AF) repair. METHODS Bovine AF cells were cultured with 25% PRP, 50% PRP, 25% PL, 50% PL, or 10% FBS. After 2 and 4 days, DNA, glycosaminoglycan (GAG), and mRNA levels were analyzed. Histology was performed after injection of PRP into an AF defect in a whole disc ex vivo. RESULTS By day 4, significant increases in DNA content were observed in all treatment groups. All groups also showed elevated GAG synthesis, with highest amounts at 50% PL. Collagen I and II expression was similar between groups; aggrecan, decorin, and versican expression was highest at 25% PL. Injection of PRP into the AF defect resulted in an increased matrix synthesis. CONCLUSIONS Platelet-rich preparations increased the matrix production and cell number and may therefore be considered to promote AF repair.
Collapse
|
21
|
Hegewald AA, Medved F, Feng D, Tsagogiorgas C, Beierfuß A, Schindler GAK, Trunk M, Kaps C, Mern DS, Thomé C. Enhancing tissue repair in annulus fibrosus defects of the intervertebral disc: analysis of a bio‐integrative annulus implant in an
in‐vivo
ovine model. J Tissue Eng Regen Med 2013; 9:405-14. [DOI: 10.1002/term.1831] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 05/05/2013] [Accepted: 09/02/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Aldemar Andres Hegewald
- Department of Neurosurgery University Medical Centre Mannheim, Heidelberg University Mannheim Germany
- Department of Neurosurgery Innsbruck Medical University Innsbruck Austria
| | - Fabian Medved
- Department of Neurosurgery University Medical Centre Mannheim, Heidelberg University Mannheim Germany
| | - Daxiong Feng
- Department of Neurosurgery University Medical Centre Mannheim, Heidelberg University Mannheim Germany
- Spinal Surgery Department The Affiliated Hospital of Luzhou Medical College Luzhou Sichuan Province P R China
| | - Charalambos Tsagogiorgas
- Department of Anaesthesiology and Critical Care Medicine University Medical Centre Mannheim, Heidelberg University Mannheim Germany
| | - Anja Beierfuß
- Department of Small Animal Surgery and Ophthalmology Ludwig Maximilian's University Munich Munich Germany
| | | | - Marcus Trunk
- Institute of Pathology University Medical Centre Mannheim, Heidelberg University Mannheim Germany
| | | | - Demissew Shenegelegn Mern
- Department of Neurosurgery University Medical Centre Mannheim, Heidelberg University Mannheim Germany
| | - Claudius Thomé
- Department of Neurosurgery Innsbruck Medical University Innsbruck Austria
| |
Collapse
|
22
|
Cho H, Lee S, Park SH, Huang J, Hasty KA, Kim SJ. Synergistic effect of combined growth factors in porcine intervertebral disc degeneration. Connect Tissue Res 2013; 54:181-6. [PMID: 23586390 DOI: 10.3109/03008207.2013.775258] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Although intervertebral disc (IVD) degeneration is one of most common causes of morbidity, its etiology remains unclear. In healthy discs, the rates of synthesis and breakdown of the extracelluar matrix (ECM) are in equilibrium because of intricate regulation by growth factors and catabolic cytokines. Important among these physiologic growth factors are transforming growth factor-β (TGF-β1) and bone morphogenetic protein-2 (BMP-2). Disc degeneration is thought to be associated with a loss of this homeostasis between proteoglycan (PG) synthesis and cytokine-induced degradation leading to up-regulation of matrix metalloproteinases (MMP) families and down-regulation of extracelluar matrix production. Several strategies using biological agents have been attempted to manage IVD degeneration, improving the function and anabolic capabilities of IVD cells and inhibiting matrix degradation. The purpose of this study is to compare the effects of the anabolic cytokines BMP-2 and TGF-β1 with those of the catabolic cytokines interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) on porcine annulus fibrosus (AF). The results of this study show that the application of pro-inflammatory cytokines like tumor necrosis factor-α and interleukin-1β to normal annulus fibrosus cells leads to a significant increase in tissue levels of the degradative protease MMP-1. Treatment with a combination of minimum doses of both BMP-2 and TGF-β1 caused a greater decrease in MMP-1 and increase in aggrecan than either cytokine alone, suggesting a synergistic effect of the combined cytokines.
Collapse
Affiliation(s)
- Hongsik Cho
- Department of Orthopaedic Surgery & Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, USA
| | | | | | | | | | | |
Collapse
|
23
|
Towards biological anulus repair: TGF-β3, FGF-2 and human serum support matrix formation by human anulus fibrosus cells. Tissue Cell 2012; 45:68-76. [PMID: 23122986 DOI: 10.1016/j.tice.2012.09.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 09/13/2012] [Accepted: 09/23/2012] [Indexed: 01/04/2023]
Abstract
Closure and biological repair of anulus fibrosus (AF) defects in intervertebral disc diseases is a therapeutic challenge. The aim of our study was to evaluate the anabolic properties of bioactive factors on cartilaginous matrix formation by AF cells. Human AF cells were harvested from degenerated lumbar AF tissue and expanded in monolayer culture. AF cell differentiation and matrix formation was initiated by forming pellet cultures and stimulation with hyaluronic acid (HA), human serum (HS), fibroblast growth factor-2 (FGF-2), transforming growth factor-β3 (TGF-β3) and TGF-β3/FGF-2 for up to 4 weeks. Matrix formation was assessed histologically by staining of proteoglycan, type I and type II collagens and by gene expression analysis of typical extracellular matrix molecules and of catabolic matrix metalloproteinases MMP-2 and MMP-13. AF cells, stimulated with HS, FGF-2 and most pronounced with TGF-β3 or TGF-β3/FGF-2 formed a cartilaginous matrix with significantly enhanced expression of matrix molecules and of MMP-13. Stimulation of AF cells with TGF-β3 was accompanied by induction of type X collagen, known to occur in hypertrophic cartilage cells having mineralizing potential. HA did not show any chondro-inductive characteristics. These findings suggest human serum, FGF-2 and TGF-β3 as possible candidates to support biological treatment strategies of AF defects.
Collapse
|
24
|
Xiong CJ, Huang B, Zhou Y, Cun YP, Liu LT, Wang J, Li CQ, Pan Y, Wang H. Macrophage migration inhibitory factor inhibits the migration of cartilage end plate-derived stem cells by reacting with CD74. PLoS One 2012; 7:e43984. [PMID: 22952837 PMCID: PMC3428348 DOI: 10.1371/journal.pone.0043984] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 07/27/2012] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Macrophage migration inhibitory factor (MIF) is a multifunctional cytokine that regulates inflammatory reactions and the pathophysiology of many inflammatory diseases. Intervertebral disc (IVD) degeneration is characterized by an inflammatory reaction, but the potential role of MIF in IVD degeneration has not been determined. Recent studies have shown that MIF and its receptor, CD74, are involved in regulating the migration of human mesenchymal stem cells (MSCs); Thus, MIF might impair the ability of mesenchymal stem cells (MSCs) to home to injured tissues. Our previous studies indicated that cartilage endplate (CEP)-derived stem cells (CESCs) as a type of MSCs exist in human degenerate IVDs. Here, we investigate the role of MIF in regulating the migration of CESCs. METHODS AND FINDINGS CESCs were isolated and identified. We have shown that MIF was distributed in human degenerate IVD tissues and was subject to regulation by the pro-inflammatory cytokine TNF-α. Furthermore, in vitro cell migration assays revealed that nucleus pulposus (NP) cells inhibited the migration of CESCs in a number-dependent manner, and ELISA assays revealed that the amount of MIF in conditioned medium (CM) was significantly increased as a function of increasing cell number. Additionally, recombinant human MIF (r-MIF) inhibited the migration of CESCs in a dose-dependent manner. CESCs migration was restored when an antagonist of MIF, (S, R)-3(4-hydroxyphenyl)-4, 5-dihydro-5-isoxazole acetic acid methyl ester (ISO-1), was added. Finally, a CD74 activating antibody (CD74Ab) was used to examine the effect of CD74 on CESCs motility and inhibited the migration of CESCs in a dose-dependent manner. CONCLUSIONS We have identified and characterized a novel regulatory mechanism governing cell migration during IVD degeneration. The results will benefit understanding of another possible mechanism for IVD degeneration, and might provide a new method to repair degenerate IVD by enhancing CESCs migration to degenerated NP tissues to exert their regenerative effects.
Collapse
Affiliation(s)
- Cheng-jie Xiong
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Bo Huang
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Yan-ping Cun
- Cancer Centre, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, People’s Republic of China
| | - Lan-tao Liu
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Jian Wang
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Chang-qing Li
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Yong Pan
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| | - Hai Wang
- Department of Orthopedics, Xinqiao Hospital, Third Millitary Medical University, Chongqing, People’s Repulic of China
| |
Collapse
|
25
|
Tissue engineering of the intervertebral disc with cultured nucleus pulposus cells using atelocollagen scaffold and growth factors. Spine (Phila Pa 1976) 2012; 37:452-8. [PMID: 22037529 DOI: 10.1097/brs.0b013e31823c8603] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN In vitro experiment using rabbit nucleus pulposus (NP) cells seeded in atelocollagen scaffolds under the stimulation of growth factors. OBJECTIVE To demonstrate the effect of anabolic growth factors in rabbit NP cells cultured in atelocollagen type I and type II. SUMMARY OF BACKGROUND DATA Atelocollagen provides intervertebral disc (IVD) cells for a biocompatible environment to produce extracellular matrix. IVD cells with exogenous transforming growth factor-beta 1 (TGF-β1) and bone morphogenetic protein-2 (BMP-2) also render an increase in matrix synthesis. However, the effect of anabolic growth factors in NP cells cultured in atelocollagens was not elucidated before. METHODS Rabbit NP cell was harvested, enzymatically digested, and cultured. The NP cells were seeded to atelocollagen type I and type II scaffolds, and then cultures were exposed to TGF-β1 (10 ng/mL) and/or BMP-2 (100 ng/mL). DNA synthesis was measured using [4H]-thymidine incorporation. Newly synthesized proteoglycan was measured using [35S]-sulfate incorporation. Reverse transcription-polymerase chain reactions (RT-PCRs) for mRNA expression of aggrecan, collagen type I, collagen type II, and osteocalcin were performed. RESULTS Rabbit NP cells cultured in atelocollagen type I scaffold showed an increase (1.7 to 2.4-fold) in DNA synthesis in response to TGF-β1 and/or BMP-2 (P < 0.05), whereas NP cultures in atelocollagen type II demonstrated a 30% increase in DNA synthesis only with combination of both growth factors compared with control (P < 0.05). Rabbit NP cells in atelocollagen type II scaffold with TGF-β1 and combination of both growth factors exhibited robust 5.3- and 5.4-fold increases in proteoglycan synthesis (P < 0.05), whereas any cultures in atelocollagen type I failed to show any significant increase compared with control. Rabbit NP cells in atelocollagen type I and type II scaffolds with TGF-β1 and/or BMP-2 demonstrated the upregulation of aggrecan, collagen type I, and collagen type II mRNA expression compared with saline control (P < 0.05). The response in transcriptional level was more robust in atelocollagen type II than in type I. In any event, there is no recognizable expression of osteocalcin (P < 0.05). CONCLUSION NP cells in atelocollagens under the stimulation of TGF-β1 and BMP-2 exhibited anabolic responses in transcriptional and translational levels. Hence, such an approach can provide a suitable engineered tissue for IVD regeneration with potential for robust refurbishment of matrix.
Collapse
|
26
|
Abbott RD, Purmessur D, Monsey RD, Iatridis JC. Regenerative potential of TGFβ3 + Dex and notochordal cell conditioned media on degenerated human intervertebral disc cells. J Orthop Res 2012; 30:482-8. [PMID: 21866573 PMCID: PMC3264846 DOI: 10.1002/jor.21534] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Accepted: 07/29/2011] [Indexed: 02/04/2023]
Abstract
Injection of soluble cell signaling factors into degenerated intervertebral discs (IVDs) offers a minimally invasive treatment that could limit the processes of degeneration by stimulating native matrix repair. This study evaluated the regenerative capacity of degenerated nucleus pulposus (NP) cells obtained from patients undergoing anterior interbody fusions by measuring metabolic activity, DNA content, glycosaminoglycan (GAG) content, and cellular phenotype using qRT-PCR profiling with a custom array of 42 genes. NP cells were cultured in alginate for 7 days with 4 treatment groups: transforming growth factor beta 3 (TGFβ3) + dexamethasone (Dex), soluble factors released from notochordal cells (NCs) cultured in alginate (NCA), soluble factors released from NCs in their native tissue environment (NCT), and basal media. TGFβ3 + Dex stimulated degenerated human NP cells to proliferate and exhibit an anti-catabolic gene expression profile (with a decrease in ADAMTS5 and MMP1 compared to basal, and an increase in SOX9, decrease in ADAMTS5, MMP1, collagen I and collagen III compared to day 0), while NCA stimulated the greatest GAG per cell. We conclude that degenerated human NP cells exhibit regenerative potential, and that an optimal treatment will likely require treatments, such as TGFβ3 + Dex, which were able to increase cell metabolism and reduce catabolism, as well as treatments with factors found in NC conditioned medium, that were able to produce high amounts of GAG per cell. Additional studies to optimize NC culture conditions are required to determine if NC conditioned medium can be made with the capacity to enhance NP cell proliferation and metabolism.
Collapse
Affiliation(s)
- Rosalyn Delia Abbott
- School of Engineering and Department of Orthopaedics & Rehabilitation, University of Vermont, 33 Colchester Avenue, Burlington, Vermont 05405
| | - Devina Purmessur
- Department of Orthopaedics, Mount Sinai School of Medicine, New York, New York
| | - Robert Daniel Monsey
- School of Engineering and Department of Orthopaedics & Rehabilitation, University of Vermont, 33 Colchester Avenue, Burlington, Vermont 05405
| | | |
Collapse
|
27
|
Lee HM, Kwon UH, Kim H, Kim HJ, Kim B, Park JO, Moon ES, Moon SH. Pulsed electromagnetic field stimulates cellular proliferation in human intervertebral disc cells. Yonsei Med J 2010; 51:954-9. [PMID: 20879066 PMCID: PMC2995961 DOI: 10.3349/ymj.2010.51.6.954] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
PURPOSE The purpose of this study is to investigate the mechanism of cellular proliferation of electromagnetic field (EMF) on human intervertebral disc (IVD) cells. MATERIALS AND METHODS Human IVD cells were cultured three-dimensionally in alginate beads. EMF was exposed to IVD cells with 650 Ω, 1.8 millitesla magnetic flux density, 60 Hz sinusoidal wave. Cultures were divided into a control and EMF group. Cytotoxicity, DNA synthesis and proteoglycan synthesis were measured by MTT assay, [(3)H]-thymidine, and [(35)S]-sulfate incorporation. To detect phenotypical expression, reverse transcription-polymerase chain reactions (RT-PCR) were performed for aggrecan, collagen type I, and type II mRNA expression. To assess action mechanism of EMF, IVD cells were exposed to EMF with N(G)-Monomethyl-L-arginine (NMMA) and acetylsalicylic acid (ASA). RESULTS There was no cytotoxicity in IVD cells with the EMF group in MTT assay. Cellular proliferation was observed in the EMF group (p < 0.05). There was no difference in newly synthesized proteoglycan normalized by DNA synthesis between the EMF group and the control. Cultures with EMF showed no significant change in the expression of aggrecan, type I, and type II collagen mRNA compared to the control group. Cultures with NMMA (blocker of nitric oxide) or ASA (blocker of prostaglandin E2) exposed to EMF demonstrated decreased DNA synthesis compared to control cultures without NMMA or ASA (p < 0.05). CONCLUSION EMF stimulated DNA synthesis in human IVD cells while no significant effect on proteoglycan synthesis and chondrogenic phenotype expressions. DNA synthesis was partially mediated by nitric oxide and prostaglandin E2. EMF can be utilized to stimulate proliferation of IVD cells, which may provide efficient cell amplification in cell therapy to degenerative disc disease.
Collapse
Affiliation(s)
- Hwan-Mo Lee
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Un-Hye Kwon
- Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Hyang Kim
- Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Ho-Joong Kim
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Boram Kim
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Jin-Oh Park
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Eun-Soo Moon
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Seong-Hwan Moon
- Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea
- Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| |
Collapse
|
28
|
Hsieh AH, Yoon ST. Update on the pathophysiology of degenerative disc disease and new developments in treatment strategies. Open Access J Sports Med 2010; 1:191-9. [PMID: 24198557 PMCID: PMC3781869 DOI: 10.2147/oajsm.s9057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Degenerative disc disease (DDD) continues to be a prevalent condition that afflicts populations on a global scale. The economic impact and decreased quality of life primarily stem from back pain and neurological deficits associated with intervertebral disc degeneration. Although much effort has been invested into understanding the etiology of DDD and its relationship to the onset of back pain, this endeavor is a work in progress. The purpose of this review is to provide focused discussion on several areas in which recent advances have been made. Specifically, we have categorized these advances into early, middle, and late phases of age-related or degenerative changes in the disc and into promising minimally invasive treatments, which aim to restore mechanical and biological functions to the disc.
Collapse
Affiliation(s)
- Adam H Hsieh
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, USA
- Department of Orthopedics, University of Maryland, Baltimore, MD, USA
| | - S Tim Yoon
- Department of Orthopedic Surgery, Emory University, Chief of Orthopedic Surgery, Veterans Affairs Medical Center, Atlanta, GA, USA
| |
Collapse
|
29
|
Grad S, Alini M, Eglin D, Sakai D, Mochida J, Mahor S, Collin E, Dash B, Pandit A. Cells and Biomaterials for Intervertebral Disc Regeneration. ACTA ACUST UNITED AC 2010. [DOI: 10.2200/s00250ed1v01y201006tis005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|