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Yang Y, Zhou X, Deng H, Chen L, Zhang X, Wu S, Song A, Liang F. The role of O-GlcNAcylation in bone metabolic diseases. Front Physiol 2024; 15:1416967. [PMID: 38915778 PMCID: PMC11194333 DOI: 10.3389/fphys.2024.1416967] [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: 04/13/2024] [Accepted: 05/20/2024] [Indexed: 06/26/2024] Open
Abstract
O-GlcNAcylation, as a post-translational modification, can modulate cellular activities such as kinase activity, transcription-translation, protein degradation, and insulin signaling by affecting the function of the protein substrate, including cellular localization of proteins, protein stability, and protein/protein interactions. Accumulating evidence suggests that dysregulation of O-GlcNAcylation is associated with disease progression such as cancer, neurodegeneration, and diabetes. Recent studies suggest that O-GlcNAcylation is also involved in the regulation of osteoblast, osteoclast and chondrocyte differentiation, which is closely related to the initiation and development of bone metabolic diseases such as osteoporosis, arthritis and osteosarcoma. However, the potential mechanisms by which O-GlcNAcylation regulates bone metabolism are not fully understood. In this paper, the literature related to the regulation of bone metabolism by O-GlcNAcylation was summarized to provide new potential therapeutic strategies for the treatment of orthopedic diseases such as arthritis and osteoporosis.
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Affiliation(s)
- Yajing Yang
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
| | - Xuchang Zhou
- School of Sport Medicine and Rehabilitation, Beijing Sport University, Beijing, China
- School of Medicine, Xiamen University, Xiamen, China
| | - HuiLi Deng
- School of Medicine, Xiamen University, Xiamen, China
| | - Li Chen
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
- Hubei Shizhen Laboratory, Wuhan, China
- Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Wuhan, China
- University of Chinese Medicine (Hubei Provincial Hospital of Traditional Chinese Medicine), Wuhan, China
| | - Xiaolin Zhang
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
- Hubei Shizhen Laboratory, Wuhan, China
- Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Wuhan, China
- University of Chinese Medicine (Hubei Provincial Hospital of Traditional Chinese Medicine), Wuhan, China
| | - Song Wu
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
- Hubei Shizhen Laboratory, Wuhan, China
- Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Wuhan, China
- University of Chinese Medicine (Hubei Provincial Hospital of Traditional Chinese Medicine), Wuhan, China
| | - Aiqun Song
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
- Hubei Shizhen Laboratory, Wuhan, China
- Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Wuhan, China
- University of Chinese Medicine (Hubei Provincial Hospital of Traditional Chinese Medicine), Wuhan, China
| | - Fengxia Liang
- College of Acupuncture-Moxibustion and Orthopedics, Hubei University of Chinese Medicine, Wuhan, China
- Hubei Shizhen Laboratory, Wuhan, China
- Hubei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion, Wuhan, China
- University of Chinese Medicine (Hubei Provincial Hospital of Traditional Chinese Medicine), Wuhan, China
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Kang YM, Shin EJ, Lee BH, Yang JH, Lee HM, Moon SH. Hypoxia Regulates the Extracellular Matrix via Mitogen-Activated Protein Kinases Pathway in Cells Retrieved from the Human Intervertebral Disc. Yonsei Med J 2021; 62:734-742. [PMID: 34296551 PMCID: PMC8298873 DOI: 10.3349/ymj.2021.62.8.734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 03/16/2021] [Accepted: 04/08/2021] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The present study aimed to identify the physiological characteristics of cells by investigating the change in gene expression and protein levels during extracellular matrix (ECM) synthesis in the intervertebral disc (IVD) under hypoxic conditions. MATERIALS AND METHODS To test the effect of oxygen on cell growth and ECM synthesis of chondrocyte-like cells, the cells from IVD were separated and cultured in two hypoxia-mimicking systems: chemical hypoxic conditions using deferoxamine (DFO), and physiological hypoxic conditions using a hypoxic chamber for 7 days. Chondrocyte like cells cultured without DFO and under the normal oxygen concentration (21% O₂ and 5% CO₂, 37°C) served as the controls. RESULTS Chondrocyte-like cells cultured in the presence of 6% oxygen demonstrated a 100% increase in cellular proliferation compared to the control. The cells treated with chemical hypoxic conditions demonstrated a dose-dependent increase in the mRNA expression of glucose transporter-1, GAPDH, aggrecan, and type II collagen on Day 1. When treated with 100 µM DFO, the cells showed a 50% increase in the levels of proteoglycan protein on Day 7. The cells treated with chemical hypoxic condition demonstrated increase in sulfated glycosaminoglycan (GAG) protein levels on Day 7. Moreover, the cells cultured in the presence of 6% oxygen showed a 120% increase in sulfated GAG levels on Day 7. CONCLUSION The oxygen concentration had an important role in the viability, proliferation, and maturation of chondrocyte-like cells in IVD. In addition, chondrocyte-like cells are sensitive to the concentration of oxygen.
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Affiliation(s)
- Young Mi Kang
- BK21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Eun Jung Shin
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Byung Ho Lee
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Jae Ho Yang
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Hwan Mo Lee
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea
| | - Seong Hwan Moon
- BK21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
- Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
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Xiong Z, Ding J, Zhou J, Yao S, Zheng J, Guo X. Correlation between the HIF-1α/Notch signaling pathway and Modic changes in nucleus pulposus cells isolated from patients with low back pain. BMC Musculoskelet Disord 2020; 21:500. [PMID: 32723315 PMCID: PMC7390108 DOI: 10.1186/s12891-020-03505-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 07/13/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The HIF-1α/Notch signaling pathway regulates cell proliferation, apoptosis, and metabolism in the intervertebral discs (IVDs) and is implicated in disc degeneration. The nucleus pulposus (NP) is an important structure adjacent to the IVDs. However, the role of the HIF-1α/Notch signaling pathway in NP cells obtained from patients with different Modic changes (MCs) remains unclear. The purpose of the present study was to investigate the role of HIF-1α and components of the Notch pathway in the NP obtained from patients with various MCs. METHODS A total of 85 NP tissue samples were collected from patients undergoing diskectomy for the treatment of low back pain. The NP tissues were divided into four groups based on the adjacent endplate degeneration, namely, MC I, II, III, and negative MC groups. The expression of HIF-1α and Notch-related components was measured and compared. RESULTS The expression of HIF-1α, Notch1, and Notch2 was gradually increased in the MC I and MC II groups compared with that in the negative MC group. HIF-1α and Notch-related components were rarely detected in the MC III group. CONCLUSIONS The expression of HIF-1α/Notch increased in the NP cells of patients with MC I and MC II. HIF-1α and Notch-related components are potential biomarkers and the HIF-1α/Notch signaling pathway may serve as a promising therapeutic target for disc degeneration in patients with MCs.
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Affiliation(s)
- Zekang Xiong
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, China
| | - Jun Ding
- Department of Neurology, Wuhan No.1 Hospital, 215 Zhongshan Avenue, Wuhan, China
| | - Jinge Zhou
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, China
| | - Sheng Yao
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, China
| | - Jin Zheng
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, China.
| | - Xiaodong Guo
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, China.
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Sun C, Lan W, Li B, Zuo R, Xing H, Liu M, Li J, Yao Y, Wu J, Tang Y, Liu H, Zhou Y. Glucose regulates tissue-specific chondro-osteogenic differentiation of human cartilage endplate stem cells via O-GlcNAcylation of Sox9 and Runx2. Stem Cell Res Ther 2019; 10:357. [PMID: 31779679 PMCID: PMC6883626 DOI: 10.1186/s13287-019-1440-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/21/2019] [Accepted: 10/01/2019] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The degenerative disc disease (DDD) is a major cause of low back pain. The physiological low-glucose microenvironment of the cartilage endplate (CEP) is disrupted in DDD. Glucose influences protein O-GlcNAcylation via the hexosamine biosynthetic pathway (HBP), which is the key to stem cell fate. Thiamet-G is an inhibitor of O-GlcNAcase for accumulating O-GlcNAcylated proteins while 6-diazo-5-oxo-L-norleucine (DON) inhibits HBP. Mechanisms of DDD are incompletely understood but include CEP degeneration and calcification. We aimed to identify the molecular mechanisms of glucose in CEP calcification in DDD. METHODS We assessed normal and degenerated CEP tissues from patients, and the effects of chondrogenesis and osteogenesis of the CEP were determined by western blot and immunohistochemical staining. Cartilage endplate stem cells (CESCs) were induced with low-, normal-, and high-glucose medium for 21 days, and chondrogenic and osteogenic differentiations were measured by Q-PCR, western blot, and immunohistochemical staining. CESCs were induced with low-glucose and high-glucose medium with or without Thiamet-G or DON for 21 days, and chondrogenic and osteogenic differentiations were measured by Q-PCR, western blot, and immunohistochemical staining. Sox9 and Runx2 O-GlcNAcylation were measured by immunofluorescence. The effects of O-GlcNAcylation on the downstream genes of Sox9 and Runx2 were determined by Q-PCR and western blot. RESULTS Degenerated CEPs from DDD patients lost chondrogenesis, acquired osteogenesis, and had higher protein O-GlcNAcylation level compared to normal CEPs from LVF patients. CESC chondrogenic differentiation gradually decreased while osteogenic differentiation gradually increased from low- to high-glucose differentiation medium. Furthermore, Thiamet-G promoted CESC osteogenic differentiation and inhibited chondrogenic differentiation in low-glucose differentiation medium; however, DON acted opposite role in high-glucose differentiation medium. Interestingly, we found that Sox9 and Runx2 were O-GlcNAcylated in differentiated CESCs. Finally, O-GlcNAcylation of Sox9 and Runx2 decreased chondrogenesis and increased osteogenesis in CESCs. CONCLUSIONS Our findings demonstrate the effect of glucose concentration on regulating the chondrogenic and osteogenic differentiation potential of CESCs and provide insight into the mechanism of how glucose concentration regulates Sox9 and Runx2 O-GlcNAcylation to affect the differentiation of CESCs, which may represent a target for CEP degeneration therapy.
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Affiliation(s)
- Chao Sun
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Weiren Lan
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Bin Li
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Rui Zuo
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Hui Xing
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Minghan Liu
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Jie Li
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Junlong Wu
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China
| | - Yu Tang
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China.
| | - Huan Liu
- Department of Orthopaedics, The Second Affiliated Hospital of Southwest Medical University, Lu Zhou, 646000, Sichuan, People's Republic of China.
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, 400038, People's Republic of China.
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The involvement of regulated in development and DNA damage response 1 (REDD1) in the pathogenesis of intervertebral disc degeneration. Exp Cell Res 2018; 372:188-197. [DOI: 10.1016/j.yexcr.2018.10.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 10/05/2018] [Accepted: 10/07/2018] [Indexed: 11/22/2022]
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Huang KY, Hsu YH, Chen WY, Tsai HL, Yan JJ, Wang JD, Liu WL, Lin RM. The roles of IL-19 and IL-20 in the inflammation of degenerative lumbar spondylolisthesis. JOURNAL OF INFLAMMATION-LONDON 2018; 15:19. [PMID: 30250404 PMCID: PMC6145204 DOI: 10.1186/s12950-018-0195-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 09/03/2018] [Indexed: 12/19/2022]
Abstract
Background Degenerative lumbar spondylolisthesis (DLS) is a major cause of spinal canal stenosis and is often related to lower back pain. IL-20 is emerging as a potent angiogenic, chemotactic, and proinflammatory cytokine related to several chronic inflammatory bone disorders likes intervertebral disc herniation, rheumatoid arthritis (RA), osteoporosis, and bone fracture. IL-19 also acts as a proinflammatory cytokine in RA. The aim of the present study was to investigate whether IL-19 and IL-20 are involved in DLS and compare three different tissues including disc, facet joint, and ligamentum flavum of patients with DLS to verify which tissue is affected more by inflammation. Methods Disc, facet joint and ligamentum flavum from 13 patients with DLS was retrieved, and the expression pattern of IL-19, IL-20, IL-20R1, IL-20R2, TNF-α, IL-1β, and MCP-1 was evaluated using immunohistochemical staining with specific antibodies. The disc cells were isolated and incubated with IL-19 and IL-20 under CoCl2-mimicked hypoxic conditions to analyze the proinflammatory cytokine expression pattern using real-time quantitative PCR with specific primers. Results IL-19 and IL-20 were positively stained and accompanied by abundant expression of TNF-α, IL-1β, and MCP-1 in facet joints of DLS patients. IL-19 and IL-20's receptors (IL-20R1 and IL-20R2) were expressed on chondrocytes and fibrocytes/fibroblasts in facet joint and ligamentum flavum tissues from patients with DLS. There was a significant correlation between the expression of IL-20 and IL-1β in facet joint. In vitro assay, IL-19 and IL-20 upregulated the expression of IL-1β, IL-6, TNF-α, IL-8, VEGF, and MCP-1 in primary cultured DLS disc cells under CoCl2-mimicked hypoxic conditions. Conclusions IL-19, IL-20, and their receptors as well as proinflammatory cytokines (TNF-α, IL-1β, and MCP-1) were expressed more in facet joints than the other tissues in patients with DLS; therefore, the etiology of inflammation might be more facet-centric. IL-19 and IL-20 induced proinflammatory cytokine expression in disc cells and might play a role in the pathogenesis of DLS.
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Affiliation(s)
- Kuo-Yuan Huang
- 1Department of Orthopedics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,2Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yu-Hsiang Hsu
- 2Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.,3Clinical Medicine Research Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Wei-Yu Chen
- 4Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung, Memorial Hospital, Kaohsiung, Taiwan
| | - Hui-Ling Tsai
- 1Department of Orthopedics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Jing-Jou Yan
- 5Department of Pathology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Jung-Der Wang
- 6Department of Public of Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Lung Liu
- 1Department of Orthopedics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Ruey-Mo Lin
- 7Department of Orthopedics, Tainan Municipal An-Nan Hospital-China Medical University, Tainan, Taiwan
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Circular RNA GRB10 as a competitive endogenous RNA regulating nucleus pulposus cells death in degenerative intervertebral disk. Cell Death Dis 2018; 9:319. [PMID: 29476072 PMCID: PMC5833826 DOI: 10.1038/s41419-017-0232-z] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/11/2017] [Accepted: 12/14/2017] [Indexed: 12/20/2022]
Abstract
Intervertebral disc degeneration (IDD) is an important factor leading to low back pain, but the underlying mechanisms remain poorly understood. Compared with normal nucleus pulposus (NP) tissues, the expression of circ-GRB10 was downregulated in IDD. Furthermore, overexpression of circ-GRB10 inhibited NP cell apoptosis. circ-GRB10 could sequester miR-328-5p, which could potentially lead to the upregulation of target genes related to cell proliferation via the ErbB pathway. In conclusion, the present study revealed that circ-GRB10/miR-328-5p/ERBB2 signaling pathway is involved in IDD development, suggesting that circ-GRB10 might be a novel therapeutic target for IDD.
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Chen L, Liu L, Xie ZY, Wang F, Sinkemani A, Zhang C, Wang XH, Wang K, Hong X, Wu XT. Endoplasmic Reticulum Stress Facilitates the Survival and Proliferation of Nucleus Pulposus Cells in TNF-α Stimulus by Activating Unfolded Protein Response. DNA Cell Biol 2018; 37:347-358. [PMID: 29381432 DOI: 10.1089/dna.2017.4029] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Intervertebral disc (IVD) degeneration is closely related to inflammatory cytokines, such as tumor necrosis factor alpha (TNF-α). The endoplasmic reticulum (ER) serves several important cell functions, which are essential for normal cell metabolism and survival. This study aims to clarify the role of ER stress and unfolded protein response (UPR) in TNF-α-induced biological changes in rat nucleus pulposus cells (NPCs) and IVD degeneration. In our research, rat NPCs were cultured with different concentrations of TNF-α in the presence or absence of ER stress inhibitors. Related genes and proteins were measured by immunofluorescence staining, quantitative real-time PCR, and Western blot analyses to monitor ER stress. Cell proliferation was evaluated by CCK-8 assay and cyclin D1 expression. Apoptosis was detected by flow cytometry and Western blot analyses. Our results showed that TNF-α induced the apoptosis of some NPCs in the early stage and then accelerated the proliferation of surviving cells. In addition, TNF-α stimulus upregulated ER stress markers and initiated UPR. However, these effects could be reversed by inhibitors, thereby reducing cell proliferation and enhancing apoptosis. In conclusion, ER stress reinforces the survival and proliferation of NPCs in TNF-α stimulus by activating UPR signaling, which could be an important therapeutic target in the future.
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Affiliation(s)
- Lu Chen
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Lei Liu
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Zhi-Yang Xie
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Feng Wang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Arjun Sinkemani
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Cong Zhang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Xiao-Hu Wang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Kun Wang
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Xin Hong
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
| | - Xiao-Tao Wu
- Department of Spine Surgery, Zhongda Hospital, School of Medicine, Southeast University , Nanjing, China
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MIF Plays a Key Role in Regulating Tissue-Specific Chondro-Osteogenic Differentiation Fate of Human Cartilage Endplate Stem Cells under Hypoxia. Stem Cell Reports 2017; 7:249-62. [PMID: 27509135 PMCID: PMC4982989 DOI: 10.1016/j.stemcr.2016.07.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 07/06/2016] [Accepted: 07/06/2016] [Indexed: 12/15/2022] Open
Abstract
Degenerative cartilage endplate (CEP) shows decreased chondrification and increased ossification. Cartilage endplate stem cells (CESCs), with the capacity for chondro-osteogenic differentiation, are responsible for CEP restoration. CEP is avascular and hypoxic, while the physiological hypoxia is disrupted in the degenerated CEP. Hypoxia promoted chondrogenesis but inhibited osteogenesis in CESCs. This tissue-specific differentiation fate of CESCs in response to hypoxia was physiologically significant with regard to CEP maintaining chondrification and refusing ossification. MIF, a downstream target of HIF1A, is involved in cartilage and bone metabolisms, although little is known about its regulatory role in differentiation. In CESCs, MIF was identified as a key point through which HIF1A regulated the chondro-osteogenic differentiation. Unexpectedly, unlike the traditionally recognized mode, increased nuclear-expressed MIF under hypoxia was identified to act as a transcriptional regulator by interacting with the promoter of SOX9 and RUNX2. This mode of HIF1A/MIF function may represent a target for CEP degeneration therapy. The hypoxic microenvironment is disrupted in degenerative CEP Hypoxia promotes chondrogenesis but inhibits osteogenesis in CESCs Hypoxia regulates chondro-osteogenesis through HIF1A/MIF pathway MIF acts as a transcriptional regulator under hypoxia
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Yao Y, Song W, Deng Q, Zhang H, Wang J, Liu H, Zhou Y. General regulatory effects of hypoxia on human cartilage endplate‑derived stem cells: A genome‑wide analysis of differential gene expression and alternative splicing events. Mol Med Rep 2017; 16:3001-3009. [PMID: 28677762 DOI: 10.3892/mmr.2017.6907] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 05/12/2017] [Indexed: 11/06/2022] Open
Abstract
Intervertebral disc (IVD) degeneration of is considered to be initiated by the degeneration of the cartilage endplate (CEP). CEP‑derived stem cells (CESCs) with the capacity for osteochondrogenic differentiation may be responsible for CEP cartilage restoration. As CEP is avascular and hypoxic, and hypoxia can greatly influence biological activities of stem cells, physiological hypoxia may serve important roles in regulating the physiological functions of CESCs. The aim of the present study was to investigate the mechanisms of hypoxia‑regulated CESCs fate by using the Human Transcriptome Array 2.0 system to identify differentially expressed genes (DEGs) and alternatively spliced genes (ASGs) in CESCs cultured under hypoxic and normoxic conditions. The high‑throughput analysis of both DEGs and ASGs were notably enriched in the immune response signal, which so far has not been investigated in IVD cells, due to their avascular nature and low immunogenicity. The present results provided a referential study direction of the mechanisms of hypoxia‑regulated CESC fate at the level of gene expression and alternative splicing, which may aid in our understanding of the processes of CEP degeneration.
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Affiliation(s)
- Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Weilin Song
- Department of Ophthalmology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China
| | - Qiyue Deng
- Department of Neurobiology, College of Basic Medical Sciences, Third Military Medical University, Chongqing 400038, P.R. China
| | - Huiyu Zhang
- Department of Stomatology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Jian Wang
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
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Yao Y, Deng Q, Sun C, Song W, Liu H, Zhou Y. A genome-wide analysis of the gene expression profiles and alternative splicing events during the hypoxia-regulated osteogenic differentiation of human cartilage endplate-derived stem cells. Mol Med Rep 2017; 16:1991-2001. [PMID: 28656244 PMCID: PMC5562021 DOI: 10.3892/mmr.2017.6846] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 04/25/2017] [Indexed: 12/20/2022] Open
Abstract
It has been hypothesized that intervertebral disc degeneration is initiated by degeneration of the cartilage endplate (CEP), which is characterized by cartilage ossification. CEP‑derived stem cells (CESCs), with the potential for chondro‑osteogenic differentiation, may be responsible for the balance between chondrification and ossification in the CEP. The CEP remains in an avascular and hypoxic microenvironment; the present study observed that hypoxia was able to markedly inhibit the osteogenic differentiation of CESCs. This tissue‑specific CESC differentiation in response to a hypoxic microenvironment was physiologically important for the prevention of ossification in the CEP. In order to study the hypoxia‑regulated mechanisms underlying osteogenic differentiation of CESCs, a Human Transcriptome Array 2.0 was used to detect differentially expressed genes (DEGs) and alternatively spliced genes (ASGs) during the osteogenic differentiation of CESCs under hypoxia, compared with those induced under normoxia. High‑throughput analysis of DEGs and ASGs demonstrated that genes in the complement pathway were enriched, which may be a potential mechanism underlying hypoxia inhibition of CESCs osteogenesis. The results of the present study may provide a basis for future mechanistic studies regarding gene expression levels and alternative splicing events during the hypoxia‑regulated inhibition of osteogenesis, which may be helpful in identifying targets for CEP degeneration therapy.
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Affiliation(s)
- Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Qiyue Deng
- Department of Neurobiology, College of Basic Medical Sciences, Third Military Medical University, Chongqing 400038, P.R. China
| | - Chao Sun
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Weiling Song
- Department of Ophthalmology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China
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12
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Yao Y, Shang J, Song W, Deng Q, Liu H, Zhou Y. Global profiling of the gene expression and alternative splicing events during hypoxia-regulated chondrogenic differentiation in human cartilage endplate-derived stem cells. Genomics 2016; 107:170-7. [PMID: 26996146 DOI: 10.1016/j.ygeno.2016.03.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 03/09/2016] [Accepted: 03/16/2016] [Indexed: 01/08/2023]
Abstract
The intervertebral disc (IVD) degeneration is initiated by cartilage endplate (CEP) degeneration and is characterised by reduced chondrification. Cartilage endplate-derived stem cells (CESCs) with chondrogenic differentiation abilities are responsible for the restoration of cartilage. CEP remains in an avascular and hypoxic microenvironment. In this study, we observed that the physiological hypoxia greatly promotes the chondrogenic differentiation of CESCs. This tissue specificity of the differentiation fate of CESCs in response to the hypoxic microenvironment was physiologically significant for the CEP to maintain the chondrification status. To investigate the mechanisms underlying the hypoxia-regulated chondrogenic differentiation of CESCs, we adopted a high-throughput scanning technology to detect the global profiling of gene expression and alternative splicing (AS) event changes during chondrogenic differentiation under hypoxia in CESCs compared to those induced under normoxia. An Affymetrix Human Transcriptome Array 2.0 was used to identify the differentially expressed genes (DEGs) and alternatively spliced genes (ASGs). After RT-PCR validation, GO and KEGG pathway analyses of both the DEGs and ASGs were performed. The enrichment of the GO functional terms and signalling pathways provided referential direction of the mechanism to study the gene expression and AS in the hypoxia-regulated chondrogenesis promotion, which could be helpful in understanding this physiological phenomenon, and it could also be instrumental in finding targets for CEP degeneration therapy.
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Affiliation(s)
- Yuan Yao
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Jin Shang
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China
| | - Weilin Song
- Department of Ophthalmology, Southwest Hospital, Third Military Medical University, Chongqing 400038, China
| | - Qiyue Deng
- Department of Neurobiology, College of Basic Medical Sciences, Third Military Medical University, Chongqing 400038, China
| | - Huan Liu
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
| | - Yue Zhou
- Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
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13
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Chen JW, Ni BB, Zheng XF, Li B, Jiang SD, Jiang LS. Hypoxia facilitates the survival of nucleus pulposus cells in serum deprivation by down-regulating excessive autophagy through restricting ROS generation. Int J Biochem Cell Biol 2014; 59:1-10. [PMID: 25456445 DOI: 10.1016/j.biocel.2014.11.009] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 10/17/2014] [Accepted: 11/21/2014] [Indexed: 12/29/2022]
Abstract
Nucleus pulposus (NP) cells reside in a hypoxic environment in vivo, while the mechanisms of how NP cells maintain survival under hypoxia are not clear. Autophagy is an important physiological response to hypoxia and implicated in the survival regulation in most types of cells. This study was designed to investigate the role of autophagy in the survival of NP cells under hypoxia. We found that appropriate autophagy activity was beneficial to the survival of NP cells in serum deprivation, while excessive autophagy led to death of the NP cells. Hypoxia facilitated the survival of NP cells in serum deprivation by down-regulating excessive autophagy. Hypoxia down-regulated the autophagy activity of NP cells through restricting the production of reactive oxygen species (ROS) and inactivating the AMPK/mTOR signaling pathway, and possibly through a pathway involving HIF-1α. We believed that understanding the autophagy response of NP cells to hypoxia and its role in cell survival had important clinical significance in the prevention and treatment of degenerative discogenic diseases.
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Affiliation(s)
- Jiang-Wei Chen
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
| | - Bin-Bin Ni
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
| | - Xin-Feng Zheng
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
| | - Bo Li
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
| | - Sheng-Dan Jiang
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China
| | - Lei-Sheng Jiang
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, 1665 Kongjiang Road, Shanghai 200092, China.
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14
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Abstract
Intervertebral disc (IVD) degeneration is implicated as a major cause of low back pain. The alternated phenotypes, reduced cell survival, decreased metabolic activity, loss of matrix production and dystrophic mineralization of nucleus pulposus (NP) cells may be key contributors to progressive IVD degeneration. IVD is the largest avascular structure in the body, characterized by low oxygen tension in vivo. Hypoxia-inducible factor (HIF) is a master transcription factor that is induced upon hypoxia and directs coordinated cellular responses to hypoxic environments. This review summarizes relevant studies concerning the involvement of HIF in the regulation of biological behaviors of NP cells. We describe current data on the expression of HIF in NP cells and further discuss the various roles that HIF plays in the regulation of the phenotype, survival, metabolism, matrix production and dystrophic mineralization of NP cells. Here, we conclude that HIF may be a promising target for the prevention and treatment of IVD degeneration.
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Affiliation(s)
- Hao Li
- Department of Orthopedics Surgery, The Second Hospital of Medical College, Zhejiang University, Hangzhou, China
| | - Cheng Zhen Liang
- Department of Orthopedics Surgery, The Second Hospital of Medical College, Zhejiang University, Hangzhou, China
| | - Qi Xin Chen
- Department of Orthopedics Surgery, The Second Hospital of Medical College, Zhejiang University, Hangzhou, China
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15
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Zhao J, Zhang P, Qin L, Pan XH. Hypoxia is essential for bone-tendon junction healing: the molecular biological evidence. INTERNATIONAL ORTHOPAEDICS 2010; 35:925-8. [PMID: 21127862 DOI: 10.1007/s00264-010-1157-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Revised: 10/24/2010] [Accepted: 10/30/2010] [Indexed: 11/29/2022]
Abstract
Bone-tendon junction (BTJ) injury is difficult to cure due to its special anatomical structure. Most methods applied for BTJ injury treatment cannot lead to the perfect restoration of the fibrocartilage zone and perfect vascular regeneration, which are two important facets of BTJ reconstruction. Based on current research, hypoxia, which has been discovered to induce chondrogenesis and angiogenesis in vivo, plays an essential role in the tissue repair process. Consequently, it is reasonable to confirm that a hypoxic environment is the prerequisite condition to obtain physiological healing of BTJ injury. In this paper, the potential relationship between hypoxia and BTJ healing is discussed. Moreover, an operation model and possible drug application to obtain hypoxic conditions are delineated.
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Affiliation(s)
- Jian Zhao
- Orthopedic Department, Affiliated Hospital of Nantong University, Xisi Road 20, 226001 Nantong City, China
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