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Ma Z, Liu X, Zhang M, Wu Z, Zhang X, Li S, An J, Luo Z. Research Progress on the Role of Cartilage Endplate in Intervertebral Disc Degeneration. Cell Biochem Funct 2024; 42:e4118. [PMID: 39267363 DOI: 10.1002/cbf.4118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2024] [Revised: 08/24/2024] [Accepted: 08/26/2024] [Indexed: 09/17/2024]
Abstract
Low back pain significantly impacts individuals' quality of life, with intervertebral disc degeneration (IDD) being a primary contributor to this condition. Currently, IDD treatment primarily focuses on symptom management and does not achieve a definitive cure. The cartilage endplate (CEP), a crucial nutrient-supplying tissue of the intervertebral disc, plays a pivotal role in disc degeneration. This review examines the mechanisms underlying CEP degeneration, summarizing recent advancements in understanding the structure and function of CEP, the involvement of various signaling pathways, and the roles of cartilage endplate stem cells (CESCs) and exosomes (Exos) in this process. The aim of this review is to provide a comprehensive reference for future research on CEP. Despite progress in understanding the role of CEP in IDD, the mechanisms underlying CEP degeneration remain incompletely elucidated. Future research poses significant challenges, necessitating further investigations to elucidate the complexities of CEP.
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Affiliation(s)
- Zhong Ma
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Xin Liu
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Mingtao Zhang
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Zuolong Wu
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Xianxu Zhang
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Shicheng Li
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Jiangdong An
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
| | - Zhiqiang Luo
- Department of Orthopaedics, Lanzhou University Second Hospital, Lanzhou, Gansu, China
- Orthopaedics Key Laboratory of Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu, China
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Li H, Tang Y, Liu Z, Chen K, Zhang K, Hu S, Pan C, Yang H, Li B, Chen H. Lumbar instability remodels cartilage endplate to induce intervertebral disc degeneration by recruiting osteoclasts via Hippo-CCL3 signaling. Bone Res 2024; 12:34. [PMID: 38816384 PMCID: PMC11139958 DOI: 10.1038/s41413-024-00331-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 02/29/2024] [Accepted: 04/01/2024] [Indexed: 06/01/2024] Open
Abstract
Degenerated endplate appears with cheese-like morphology and sensory innervation, contributing to low back pain and subsequently inducing intervertebral disc degeneration in the aged population.1 However, the origin and development mechanism of the cheese-like morphology remain unclear. Here in this study, we report lumbar instability induced cartilage endplate remodeling is responsible for this pathological change. Transcriptome sequencing of the endplate chondrocytes under abnormal stress revealed that the Hippo signaling was key for this process. Activation of Hippo signaling or knockout of the key gene Yap1 in the cartilage endplate severed the cheese-like morphological change and disc degeneration after lumbar spine instability (LSI) surgery, while blocking the Hippo signaling reversed this process. Meanwhile, transcriptome sequencing data also showed osteoclast differentiation related gene set expression was up regulated in the endplate chondrocytes under abnormal mechanical stress, which was activated after the Hippo signaling. Among the discovered osteoclast differentiation gene set, CCL3 was found to be largely released from the chondrocytes under abnormal stress, which functioned to recruit and promote osteoclasts formation for cartilage endplate remodeling. Over-expression of Yap1 inhibited CCL3 transcription by blocking its promoter, which then reversed the endplate from remodeling to the cheese-like morphology. Finally, LSI-induced cartilage endplate remodeling was successfully rescued by local injection of an AAV5 wrapped Yap1 over-expression plasmid at the site. These findings suggest that the Hippo signaling induced osteoclast gene set activation in the cartilage endplate is a potential new target for the management of instability induced low back pain and lumbar degeneration.
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Affiliation(s)
- Hanwen Li
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
- Orthopedic Institute, Suzhou Medical College, Soochow University, Suzhou, P.R. China
| | - Yingchuang Tang
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
- Orthopedic Institute, Suzhou Medical College, Soochow University, Suzhou, P.R. China
| | - Zixiang Liu
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Kangwu Chen
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Kai Zhang
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
| | - Sihan Hu
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China
- Orthopedic Institute, Suzhou Medical College, Soochow University, Suzhou, P.R. China
| | - Chun Pan
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, P.R. China
| | - Huilin Yang
- Department of Orthopedic Surgery, First Affiliated Hospital of Soochow University, Suzhou, P.R. China.
- Orthopedic Institute, Suzhou Medical College, Soochow University, Suzhou, P.R. China.
| | - Bin Li
- Orthopedic Institute, Suzhou Medical College, Soochow University, Suzhou, P.R. China.
| | - Hao Chen
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, P.R. China.
- Department of Orthopedic Surgery, Affiliated Hospital of Yangzhou University, Yangzhou, P.R. China.
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Khaleque MA, Kim JH, Lee HH, Kim GH, You WY, Lee WJ, Kim YY. Comparative Analysis of Autophagy and Apoptosis in Disc Degeneration: Understanding the Dynamics of Temporary-Compression-Induced Early Autophagy and Sustained-Compression-Triggered Apoptosis. Int J Mol Sci 2024; 25:2352. [PMID: 38397026 PMCID: PMC10889391 DOI: 10.3390/ijms25042352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 01/31/2024] [Accepted: 02/09/2024] [Indexed: 02/25/2024] Open
Abstract
The purpose of this study was to investigate the initiation of autophagy activation and apoptosis in nucleus pulposus cells under temporary compression (TC) and sustained compression (SC) to identify ideal research approaches in intervertebral disc degeneration. Various techniques were used: radiography (X-ray), magnetic resonance imaging (MRI), transmission electron microscope (TEM), H&E staining, Masson's trichrome staining, immunohistochemistry (IHC) (LC3, beclin-1, and cleaved caspase-3), and real-time polymerase chain reaction (RT-qPCR) for autophagy-related (beclin-1, LC3, and P62) and apoptosis-related (caspase-3 and PARP) gene expression analysis. X-ray and MRI revealed varying degrees of disc degeneration, ranging from moderate to severe in both groups. The severity was directly linked to compression duration, with SC resulting in notably severe central NP cell degeneration. Surprisingly, TC also caused similar, though less severe, degeneration. Elevated expression of LC3 and beclin-1 was identified after 6 weeks, but it notably declined after 12 weeks. Central NP cells in both groups exhibited increased expression of cleaved caspase-3 that was positively correlated with the duration of SC. TC showed fewer apoptotic markers compared to SC. LC3, beclin-1, and P62 mRNA expression peaked after 6 weeks and declined after 12 weeks in both groups. Cleaved caspase-3 and PARP expression peaked in SC, positively correlating with longer compression duration, while TC showed lower levels of apoptosis gene expression. Furthermore, TEM results revealed different events of the autophagic degradation process after 2 weeks of compression. TCmay be ideal for studying early triggered autophagy-mediated degeneration, while SC may be ideal for studying late or slower-triggered apoptosis-mediated degeneration.
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Affiliation(s)
| | | | | | | | | | | | - Young-Yul Kim
- Department of Orthopedic Surgery, Daejeon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Daejeon 34943, Republic of Korea; (M.A.K.); (J.-H.K.); (H.-H.L.); (G.-H.K.); (W.-Y.Y.); (W.-J.L.)
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Zhang Y, Liu C, Li Y, Xu H. Mechanism of the Mitogen-Activated Protein Kinases/Mammalian Target of Rapamycin Pathway in the Process of Cartilage Endplate Stem Cell Degeneration Induced by Tension Load. Global Spine J 2023; 13:2396-2408. [PMID: 35400210 PMCID: PMC10538332 DOI: 10.1177/21925682221085226] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
STUDY DESIGN Basic Research. OBJECTIVE Intervertebral disc degeneration (IVDD) is caused by the cartilage endplate (CEP). Cartilage endplate stem cell (CESC) is involved in the recovery of CEP degeneration. Tension load (TL) contributes a lot to the initiation and progression of IVDD. This study aims to investigate the regulatory mechanism of the Mitogen-activated protein kinases/Mammalian target of rapamycin (MAPK/mTOR) pathway during TL-induced CESC degeneration. METHODS CESCs were isolated from New Zealand big-eared white female rabbits (6 months old). FX-4000T cell stress loading system was applied to establish a TL-induced degeneration model of CESCs. Western blotting was used to detect the level of mTOR pathway-related proteins and autophagy markers LC3-Ⅱ, Beclin-1, and p62 in degenerative CESCs. The expression of MAPK pathway-related proteins JNK and extracellular signal-regulated kinases (ERK) in degenerated CESCs was inhibited by cell transfection to explore whether JNK and ERK play a regulatory role in TL-induced autophagy in CESCs. RESULTS In the CESC degeneration model, the mTOR pathway was activated. After inhibition of mTOR, the autophagy level of CESCs was increased, and the degeneration of CESCs was alleviated. The MAPK pathway was also activated in the CESC degeneration model. Inhibition of JNK expression may alleviate TL-induced CEP degeneration by inhibiting Raptor phosphorylation and activating autophagy. Inhibition of ERK expression may alleviate TL-induced CEP degeneration by inhibiting mTOR phosphorylation and activating autophagy. CONCLUSION Inhibition of JNK and ERK in the MAPK signaling family alleviated TL-induced CESC degeneration by inhibiting the phosphorylation of Raptor and mTOR in the mTOR pathway.
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Affiliation(s)
- Yu Zhang
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Chen Liu
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Yu Li
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
| | - Hongguang Xu
- Spine Research Center of Wannan Medical College, Department of Spine Surgery, Yijishan Hospital, The First Affiliated Hospital of Wannan Medical College, Wuhu, P.R. China
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Wei H, Xu X, Feng G, Shao S, Chen X, Yang Z. Candidate genes potentially involved in molting and body size reduction in the male of the horned gall aphid, Schlechtendalia chinensis. Front Physiol 2023; 14:1097317. [PMID: 36814477 PMCID: PMC9940790 DOI: 10.3389/fphys.2023.1097317] [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: 11/15/2022] [Accepted: 01/19/2023] [Indexed: 02/09/2023] Open
Abstract
In general, insects grow (increase in body size) through molting. To the opposite, the body size of the males of the horned gall aphid, Schlechtendalia chinensis, gets smaller after molting and as they age. To understand the molecular bases of this rare phenomenon, transcriptomes were generated from 1-5 days old male and the data were analyzed via a weighted gene co-expression network analysis (WGCNA). A total of 15 partitioned modules with different topological overlaps were obtained, and four modules were identified as highly significant for male body length (p < 0.05). Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis suggested that a portion of genes in the four modules are likely involved in autophagy and apoptosis. In addition, a total of 40 hub genes were obtained in the four modules, and among them eight genes were highly expressed in males compared to individuals of other generations of S. chinensis. These eight genes were associated with autophagy and apoptosis. Our results reveal the unique negative growth phenomenon in male S. chinensis after molting, and also suggest that the male S. chinensis with no ability to feed probably decompose their own substances via autophagy and apoptosis to provide energy for life activities such as germ cell development.
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Impact of Microenvironmental Changes during Degeneration on Intervertebral Disc Progenitor Cells: A Comparison with Mesenchymal Stem Cells. Bioengineering (Basel) 2022; 9:bioengineering9040148. [PMID: 35447707 PMCID: PMC9025850 DOI: 10.3390/bioengineering9040148] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 12/22/2022] Open
Abstract
Intervertebral disc (IVD) degeneration occurs with natural ageing and is linked to low back pain, a common disease. As an avascular tissue, the microenvironment inside the IVD is harsh. During degeneration, the condition becomes even more compromised, presenting a significant challenge to the survival and function of the resident cells, as well as to any regeneration attempts using cell implantation. Mesenchymal stem cells (MSCs) have been proposed as a candidate stem cell tool for IVD regeneration. Recently, endogenous IVD progenitor cells have been identified inside the IVD, highlighting their potential for self-repair. IVD progenitor cells have properties similar to MSCs, with minor differences in potency and surface marker expression. Currently, it is unclear how IVD progenitor cells react to microenvironmental factors and in what ways they possibly behave differently to MSCs. Here, we first summarized the microenvironmental factors presented in the IVD and their changes during degeneration. Then, we analyzed the available studies on the responses of IVD progenitor cells and MSCs to these factors, and made comparisons between these two types of cells, when possible, in an attempt to achieve a clear understanding of the characteristics of IVD progenitor cells when compared to MSCs; as well as, to provide possible clues to cell fate after implantation, which may facilitate future manipulation and design of IVD regeneration studies.
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Huo Y, Yang D, Lai K, Tu J, Zhu Y, Ding W, Yang S. Antioxidant Effects of Resveratrol in Intervertebral Disk. J INVEST SURG 2021; 35:1135-1144. [PMID: 34670455 DOI: 10.1080/08941939.2021.1988771] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Intervertebral disk (IVD) degeneration (IVDD) can cause various spinal degenerative diseases. Cumulative evidence has indicated that IVDD can result from inflammation, apoptosis, autophagy, biomechanical changes and other factors. Currently, lack of conservative treatment for degenerative spinal diseases leads to an urgent demand for clinically applicable medication to ameliorate the progression of IVDD. Resveratrol (3,5,4'-trihydroxy-trans-stilbene), a polyphenol compound extracted from red wine or grapes, has shown protective effects on IVD, alleviating the progression of IVDD. Resveratrol has been demonstrated as a scavenger of free radicals both in vivo and in vitro. The antioxidant effects of resveratrol are likely attributed to its regulation on mitochondrial dysfunction or the elimination of reactive oxygen species. This review will summarize the mechanisms of the reactive oxygen species production and elaborate the mechanisms of resveratrol in retarding IVDD progression, providing a comprehensive understanding of the antioxidant effects of resveratrol in IVD.
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Affiliation(s)
- Yachong Huo
- Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, PR China.,Hebei Medical University, Shijiazhuang, PR China
| | - Dalong Yang
- Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, PR China
| | - Kaitao Lai
- ANZAC Research Institute, The University of Sydney, Sydney, Australia
| | - Ji Tu
- Spine Labs, St. George & Sutherland Clinical School, University of New South Wales, Sydney, Australia
| | - Yibo Zhu
- School of Chemical Engineering, The University of Queensland, Brisbane, Australia
| | - Wenyuan Ding
- Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, PR China
| | - Sidong Yang
- Department of Spine Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, PR China.,Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia
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Guan Y, Sun C, Zou F, Wang H, Lu F, Song J, Liu S, Xia X, Jiang J, Ma X. Carbohydrate sulfotransferase 3 (CHST3) overexpression promotes cartilage endplate-derived stem cells (CESCs) to regulate molecular mechanisms related to repair of intervertebral disc degeneration by rat nucleus pulposus. J Cell Mol Med 2021; 25:6006-6017. [PMID: 33993645 PMCID: PMC8256370 DOI: 10.1111/jcmm.16440] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/21/2021] [Accepted: 02/25/2021] [Indexed: 12/30/2022] Open
Abstract
To investigate the regulatory effect of carbohydrate sulfotransferase 3 (CHST3) in cartilage endplate-derived stem cells (CESCs) on the molecular mechanism of intervertebral disc degeneration after nucleus pulposus repair in rats. We performed GO and KEGG analysis of GSE15227 database to select the differential genes CHST3 and CSPG4 in grade Ⅱ, Ⅲ and Ⅳ intervertebral disc degeneration, IHC and WB to detect the protein profile of CHST3 and CSPG4, Co-IP for the interaction between CHST3 and CSPG4. Then, immunofluorescence was applied to measure the level of CD90 and CD105, and flow cytometry indicated the level of CD73, CD90 and CD105 in CESCs. Next, Alizarin red staining, Alcian blue staining and TEM were performed to evaluate the effects of CESCs into osteoblasts and chondroblasts, respectively, CCK8 for the cell proliferation of osteoblasts and chondroblasts after induction for different times; cell cycle of osteoblasts or chondroblasts was measured by flow cytometry after induction, and WB for the measurement of specific biomarkers of OC and RUNX in osteoblasts and aggrecan, collagen II in chondroblasts. Finally, colony formation was applied to measure the cell proliferation of CESCs transfected with ov-CHST3 or sh-CHST3 when cocultured with bone marrow cells, WB for the protein expression of CHST3, CSPG4 and ELAVL1 in CSECs, transwell assay for the migration of CESCs to bone marrow cells, TEM image for the cellular characteristics of bone marrow cells, and WB for the protein profile of VCAN, VASP, NCAN and OFD1 in bone marrow cells. CHST3 and CSPG4 were differentially expressed and interacted in grade Ⅱ, Ⅲ and Ⅳ intervertebral disc degeneration; CD73, CD90 and CD105 were lowly expressed in CESCs, osteogenic or chondroblastic induction changed the characteristics, proliferation, cell cycle and specific biomarkers of osteoblasts and chondroblasts after 14 or 21 days,; CHST3 affected the cell proliferation, protein profile, migration and cellular features of cocultured CESCs or bone marrow cells. CHST3 overexpression promoted CESCs to regulate bone marrow cells through interaction with CSPG4 to repair the grade Ⅱ, Ⅲ and Ⅳ intervertebral disc degeneration.
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Affiliation(s)
- Yunzhi Guan
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Chi Sun
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Fei Zou
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Hongli Wang
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Feizhou Lu
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Jian Song
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Siyang Liu
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Xinlei Xia
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Jianyuan Jiang
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
| | - Xiaosheng Ma
- Department of OrthopedicsHuashan HospitalFudan UniversityShanghaiChina
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Shen Z, Kumar D, Liu X, Yan B, Fang P, Gu Y, Li M, Xie M, Yuan R, Feng Y, Hu X, Cao G, Xue R, Chen H, Liu X, Gong C. Metatranscriptomic Analysis Reveals an Imbalance of Hepatopancreatic Flora of Chinese Mitten Crab Eriocheir sinensis with Hepatopancreatic Necrosis Disease. BIOLOGY 2021; 10:biology10060462. [PMID: 34071147 PMCID: PMC8224665 DOI: 10.3390/biology10060462] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/19/2021] [Accepted: 05/20/2021] [Indexed: 01/05/2023]
Abstract
Simple Summary The cause of Chinese mitten crab Eriocheir sinensis hepatopancreas necrosis disease (HPND) remains a mystery. In this study, metatranscriptomics sequencing was conducted to characterize the changes in the structure and gene expression of hepatopancreatic flora of crabs with and without typical symptoms of HPND; an imbalance of hepatopancreatic flora can be found in the crab with HPND, and the detected microbial taxa decreased, whereas the prevalence of Spiroplasma eriocheiris significantly increased in the hepatopancreatic flora of crabs with typical symptoms of HPND, and the relative abundances of the virus and microsporidia in crabs with HPND were very low and did not increase with disease progression. The differentially-expressed genes (DEGs) in hepatopancreatic flora between crabs with and without HPND were enriched ribosome, retinol metabolism, and biosynthesis of unsaturated fatty acid KEGG pathways. These results suggested that an imbalance of hepatopancreatic flora was associated with crab HPND, and the enriched pathways of DEGs were associated with the pathological mechanism of HPND. Abstract Hepatopancreas necrosis disease (HPND) of the Chinese mitten crab Eriocheir sinensis causes huge economic loss in China. However, the pathogenic factors and pathogenesis are still a matter of dissension. To search for potential pathogens, the hepatopancreatic flora of diseased crabs with mild symptoms, diseased crabs with severe symptoms, and crabs without visible symptoms were investigated using metatranscriptomics sequencing. The prevalence of Absidia glauca and Candidatus Synechococcus spongiarum decreased, whereas the prevalence of Spiroplasma eriocheiris increased in the hepatopancreatic flora of crabs with HPND. Homologous sequences of 34 viral species and 4 Microsporidian species were found in the crab hepatopancreas without any significant differences between crabs with and without HPND. Moreover, DEGs in the hepatopancreatic flora between crabs with severe symptoms and without visible symptoms were enriched in the ribosome, retinol metabolism, metabolism of xenobiotics by cytochrome P450, drug metabolism—cytochrome P450, biosynthesis of unsaturated fatty acids, and other glycan degradation. Moreover, the relative abundance of functions of DEDs in the hepatopancreatic flora changed with the pathogenesis process. These results suggested that imbalance of hepatopancreatic flora was associated with crab HPND. The identified DEGs were perhaps involved in the pathological mechanism of HPND; nonetheless, HPND did not occur due to virus or microsporidia infection.
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Affiliation(s)
- Zeen Shen
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Dhiraj Kumar
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
- School of Studies in Zoology, Jiwaji University, Gwalior 474011, India
| | - Xunmeng Liu
- Jiangsu Center for Control and Prevention of Aquatic Animal Infectious Disease, Nanjing 210036, China; (X.L.); (P.F.); (R.Y.); (H.C.); (X.L.)
| | - Bingyu Yan
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Ping Fang
- Jiangsu Center for Control and Prevention of Aquatic Animal Infectious Disease, Nanjing 210036, China; (X.L.); (P.F.); (R.Y.); (H.C.); (X.L.)
| | - Yuchao Gu
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Manyun Li
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Meiping Xie
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Rui Yuan
- Jiangsu Center for Control and Prevention of Aquatic Animal Infectious Disease, Nanjing 210036, China; (X.L.); (P.F.); (R.Y.); (H.C.); (X.L.)
| | - Yongjie Feng
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
| | - Xiaolong Hu
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
- Agricultural Biotechnology Research Institute, Agricultural Biotechnology and Ecological Research Institute, Soochow University, Suzhou 215123, China
| | - Guangli Cao
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
- Agricultural Biotechnology Research Institute, Agricultural Biotechnology and Ecological Research Institute, Soochow University, Suzhou 215123, China
| | - Renyu Xue
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
- Agricultural Biotechnology Research Institute, Agricultural Biotechnology and Ecological Research Institute, Soochow University, Suzhou 215123, China
| | - Hui Chen
- Jiangsu Center for Control and Prevention of Aquatic Animal Infectious Disease, Nanjing 210036, China; (X.L.); (P.F.); (R.Y.); (H.C.); (X.L.)
| | - Xiaohan Liu
- Jiangsu Center for Control and Prevention of Aquatic Animal Infectious Disease, Nanjing 210036, China; (X.L.); (P.F.); (R.Y.); (H.C.); (X.L.)
| | - Chengliang Gong
- School of Biology and Basic Medical Science, Soochow University, Suzhou 215123, China; (Z.S.); (D.K.); (B.Y.); (Y.G.); (M.L.); (M.X.); (Y.F.); (X.H.); (G.C.); (R.X.)
- Agricultural Biotechnology Research Institute, Agricultural Biotechnology and Ecological Research Institute, Soochow University, Suzhou 215123, China
- Correspondence:
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Luo L, Jian X, Sun H, Qin J, Wang Y, Zhang J, Shen Z, Yang D, Li C, Zhao P, Liu M, Tian Z, Zhou Y. Cartilage endplate stem cells inhibit intervertebral disc degeneration by releasing exosomes to nucleus pulposus cells to activate Akt/autophagy. Stem Cells 2021; 39:467-481. [PMID: 33459443 PMCID: PMC8048856 DOI: 10.1002/stem.3322] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 12/01/2020] [Indexed: 12/17/2022]
Abstract
Degeneration of the cartilage endplate (CEP) induces intervertebral disc degeneration (IVDD). Nucleus pulposus cell (NPC) apoptosis is also an important exacerbating factor in IVDD, but the cascade mechanism in IVDD is not clear. We investigated the apoptosis of NPCs and IVDD when stimulated by normal cartilage endplate stem cell (CESC)-derived exosomes (N-Exos) and degenerated CESC-derived exosomes (D-Exos) in vitro and in vivo. Tert-butyl hydroperoxide (TBHP) was used to induce inflammation of CESCs. The bioinformatics differences between N-Exos and D-Exos were analyzed using mass spectrometry, heat map, and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis. NPC apoptosis was examined using TUNEL staining. The involvement of the AKT and autophagy signaling pathways was investigated using the signaling inhibitor LY294002. Magnetic resonance imaging, Western blotting, and immunofluorescence staining were used to evaluate the therapeutic effects of N-Exos in rats with IVDD. TBHP effectively induced inflammation and the degeneration of CEP in rat. N-Exos were more conducive to autophagy activation than D-Exos. The apoptotic rate of NPCs decreased obviously after treatment with N-Exos compared to D-Exos. N-Exos inhibited NPCs apoptosis and attenuated IVDD in rat via activation of the AKT and autophagy pathways. These results are the first findings to confirm that CEP delayed the progression of IVDD via exosomes. The therapeutic effects of N-Exos on NPC apoptosis inhibition and the slowing of IVDD progression were more effective than D-Exos due to activation of the PI3K/AKT/autophagy pathway, which explained the increase in the incidence of IVDD after inflammation of the CEP.
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Affiliation(s)
- Liwen Luo
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China,Institute of Immunology, PLA, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Xiuying Jian
- Department of Infectious DiseasesSecond Affiliated Hospital of Chongqing Medical UniversityChongqingPeople's Republic of China
| | - Hui Sun
- Department of Rheumatology and immunologySouthwest Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Jinghao Qin
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Yanqiu Wang
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Ji Zhang
- Institute of Immunology, PLA, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Zigang Shen
- Institute of Immunology, PLA, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Di Yang
- Institute of Immunology, PLA, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Changqing Li
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome BiologyBiological Science Research Center Southwest UniversityChongqingPeople's Republic of China
| | - MingHan Liu
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
| | - Zhiqiang Tian
- Institute of Immunology, PLA, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China,State Key Laboratory of Silkworm Genome BiologyBiological Science Research Center Southwest UniversityChongqingPeople's Republic of China
| | - Yue Zhou
- Department of OrthopaedicsXinqiao Hospital, Army Medical University (Third Military Medical University)ChongqingPeople's Republic of China
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Abstract
Mitochondrial dysfunction is involved in aging and multiple degenerative diseases, including intervertebral disc degeneration (IVDD) and osteoarthritis (OA). Thus, the maintenance of mitochondria homeostasis and function is important. Mitophagy, a process that selectively clears damaged or dysfunctional mitochondria through autophagic machinery, functions to maintain mitochondrial quality control and homeostasis. IVDD and OA are similar joint diseases involving the degradation of cartilaginous tissues that are mainly caused by oxidative stress, cell apoptosis and extracellular matrix (ECM) degradation. Over the past decade, accumulating evidence indicates the essential role of mitophagy in the pathogenesis of IVDD and OA. Importantly, strategies by the regulation of mitophagy exert beneficial effects in the pre-clinical experiments. Given the importance and novelty of mitophagy, we provide an overview of mitophagy pathways and discuss the roles of mitophagy in IVDD and OA. We also highlight the potential of targeting mitophagy for the treatment of degenerative joint diseases. Abbreviations: AD: Alzheimer disease; AF: annulus fibrosus; ADORA2A/A2AR: adenosine A2a receptor; AMBRA1: autophagy and beclin 1 regulator 1; BMSCs: bone marrow mesenchymal stem cells; BNIP3: BCL2 interacting protein 3; BNIP3L/NIX: BCL2/adenovirus E1B interacting protein 3-like; CDH6: cadherin 6; CEP: cartilaginous endplates; circRNA: circular RNA; DNM1L/DRP1: dynamin 1-like; ECM: extracellular matrix; HIF1A: hypoxia inducible factor 1: alpha subunit; IL1B: interleukin 1 beta; IMM: inner mitochondrial membranes; IVDD: intervertebral disc degeneration; MAPK8/JNK: mitogen-activated protein kinase 8; MFN1: mitofusin 1; MFN2: mitofusin 2; MIA: monosodium iodoacetate; RHOT/MIRO: ras homolog family member T; MMP: mitochondrial transmembrane potential; CALCOCO2/NDP52: calcium binding and coiled-coil domain 2; NFE2L2: nuclear factor: erythroid 2 like 2; NP: nucleus pulposus; OA: osteoarthritis; OPA1: OPA1: mitochondrial dynamin like GTPase; OPTN: optineurin; PRKN: parkin RBR E3 ubiquitin protein ligase; PD: Parkinson disease; PGAM5: PGAM family member 5; PPARGC1A/PGC-1A: peroxisome proliferator activated receptor: gamma: coactivator 1 alpha; PHF23: PHD finger protein 23; PINK1: PTEN induced putative kinase 1; ROS: reactive oxygen species; SfMSCs: synovial fluid MSCs; SIRT1: sirtuin 1; SIRT2: sirtuin 2; SIRT3: sirtuin 3; SQSTM1/p62: sequestosome 1; TNF: tumor necrosis factor; Ub: ubiquitin; UBL: ubiquitin-like; VDAC: voltage-dependent anion channel.
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Affiliation(s)
- Kai Sun
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xingzhi Jing
- Department of Spine Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Jiachao Guo
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xudong Yao
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Fengjing Guo
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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Abstract
Intervertebral disc (IVD) degeneration is associated with low back pain. In IVDs, a high mechanical load, high osmotic pressure and hypoxic conditions create a hostile microenvironment for resident cells. How IVD homeostasis and function are maintained under stress remains to be understood; however, several research groups have reported isolating native endogenous progenitor-like or otherwise proliferative cells from the IVD. The isolation of such cells implies that the IVD might contain a quiescent progenitor-like population that could be activated for IVD repair and regeneration. Increased understanding of endogenous disc progenitor cells will improve our knowledge of IVD homeostasis and, when combined with tissue engineering techniques, might hold promise for future therapeutic applications. In this Review, the characteristics of progenitor cells in different IVD compartments are discussed, as well as the potency of different cell populations within the IVD. The stem cell characteristics of these cells are also compared with those of mesenchymal stromal cells. On the basis of existing evidence, whether and how IVD degeneration and the hostile microenvironment might affect endogenous progenitor cell function are considered, and ways to channel the potential of these cells for IVD repair are suggested.
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Zheng X, Huang Y, Li J. Discussion on action mechanism of traditional Chinese medicine on chronic atrophic gastritis from the perspective of gene regulation. Shijie Huaren Xiaohua Zazhi 2019; 27:703-708. [DOI: 10.11569/wcjd.v27.i11.703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
At present, research on tumor genes related to chronic atrophic gastritis (CAG), a form of precancerous lesion of gastric cancer, has become a hot topic. In this paper, we discuss the mechanism of action of traditional Chinese medicine treatment on CAG from the aspects of protooncogenes, tumor suppressor genes, and apoptosis-related genes, with an aim to provide new ideas for clinical treatment and prevention of CAG.
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Affiliation(s)
- Xue Zheng
- Department of Acupuncture and Moxibustion, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
| | - Yan Huang
- Shanghai Institute of Acupuncture and Moxibustion, Shanghai University of Traditional Chinese Medicine, Shanghai 200030, China
| | - Jing Li
- Department of Acupuncture and Moxibustion, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 200437, China
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Intervertebral Disc-Derived Stem/Progenitor Cells as a Promising Cell Source for Intervertebral Disc Regeneration. Stem Cells Int 2018; 2018:7412304. [PMID: 30662469 PMCID: PMC6312624 DOI: 10.1155/2018/7412304] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 10/18/2018] [Accepted: 11/05/2018] [Indexed: 12/14/2022] Open
Abstract
Intervertebral disc (IVD) degeneration is considered to be the primary reason for low back pain. Despite remarkable improvements in both pharmacological and surgical management of IVD degeneration (IVDD), therapeutic effects are still unsatisfactory. It is because of the fact that these therapies are mainly focused on alleviating the symptoms rather than treating the underlying cause or restoring the structure and biomechanical function of the IVD. Accumulating evidence has revealed that the endogenous stem/progenitor cells exist in the IVD, and these cells might be a promising cell source in the regeneration of degenerated IVD. However, the biological characteristics and potential application of IVD-derived stem/progenitor cells (IVDSCs) have yet to be investigated in detail. In this review, the authors aim to perform a review to systematically discuss (1) the isolation, surface markers, classification, and biological characteristics of IVDSCs; (2) the aging- and degeneration-related changes of IVDSCs and the influences of IVD microenvironment on IVDSCs; and (3) the potential for IVDSCs to promote regeneration of degenerated IVD. The authors believe that this review exclusively address the current understanding of IVDSCs and provide a novel approach for the IVD regeneration.
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Gao XX, Li XH, Zhang QF, Zhu M, Guo YX, Deng KP, Zhang GM, Wang F. Effects of l-arginine on endometrial microvessel density in nutrient-restricted Hu sheep. Theriogenology 2018; 119:252-258. [DOI: 10.1016/j.theriogenology.2018.07.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 07/14/2018] [Accepted: 07/16/2018] [Indexed: 11/28/2022]
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Rhein Induces Cell Death in HepaRG Cells through Cell Cycle Arrest and Apoptotic Pathway. Int J Mol Sci 2018; 19:ijms19041060. [PMID: 29614833 PMCID: PMC5979559 DOI: 10.3390/ijms19041060] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 03/25/2018] [Accepted: 03/31/2018] [Indexed: 12/17/2022] Open
Abstract
Rhein, a naturally occurring active anthraquinone found abundantly in various medicinal and nutritional herbs, possesses a wide spectrum of pharmacological effects. Furthermore, previous studies have reported that rhein could induce hepatotoxicity in rats. However, its cytotoxicity and potential molecular mechanisms remain unclear. Therefore, the present study aimed to investigate the cytotoxicity of rhein on HepaRG cells and the underlying mechanisms of its cytotoxicity. Our results demonstrate, by 3-(4,5-dimethyl thiazol-2-yl-)-2,5-diphenyl tetrazolium bromide (MTT) and Annexin V-fluoresce isothiocyanate (FITC)/propidium iodide (PI) double-staining assays, that rhein significantly inhibited cell viability and induced apoptosis in HepaRG cells. Moreover, rhein treatment resulted in the generation of reactive oxygen species (ROS), loss of mitochondrial membrane potential (MMP), and S phase cell cycle arrest. The results of Western blotting showed that rhein treatment resulted in a significant increase in the protein levels of Fas, p53, p21, Bax, cleaved caspases-3, -8, -9, and poly(ADP-ribose)polymerase (PARP). The protein expression of Bcl-2, cyclin A, and cyclin-dependent kinase 2 (CDK 2) was decreased. In conclusion, these results suggest that rhein treatment could inhibit cell viability of HepaRG cells and induce cell death through cell cycle arrest in the S phase and activation of Fas- and mitochondrial-mediated pathways of apoptosis. These findings emphasize the need to assess the risk of exposure for humans to rhein.
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Huang Z, Wang Y, Ma K. [Expression and significance of hypoxia-inducible factor 1α in endplate chondrocytes of rats]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2017; 31:351-356. [PMID: 29806267 DOI: 10.7507/1002-1892.201611129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Objective To explore the expression and significance of hypoxia-inducible factor 1α (HIF-1α) in endplate chondrocytes, and to study the relations between HIF-1α expression and endplate chondrocytes apoptosis. Methods Eight Sprague Dawley rats were selected to obtain the L 1-5 intervertebral disc endplate; the endplate chondrocytes were isolated by enzyme digestion method, and the endplate chondrocytes at passage 3 were cultured under 20% O 2 condition (group A), and under 0.5% O 2 condition (group B). Cell morphology was observed by inverted phase contrast microscope and cell apoptosis was detected using flow cytometry after cultured for 24 hours; the mRNA expression of HIF-1α was detected by real-time fluorescent quantitative PCR, the protein expressions of HIF-1α, Bax, and Bcl-2 by Western blot. Gene clone technology to design and synthesize two siRNAs based on the sequence of HIF-1α mRNA. HIF-1α specific RNAi sequence compound was constructed and transfected into cells. The transfected endplate chondrocytes at passage 3 were cultured under 0.5% O 2 condition in group C and group D (HIF-1α gene was silenced). After cultured for 24 hours, cells were observed via immunofluorescence staining of HIF-1α, and cell apoptosis was detected using flow cytometry. Meanwhile, the mRNA expressions of HIF-1α, collagen type II (COL II), Aggrecan, and SOX9 were detected by real-time fluorescent quantitative PCR, and the protein expressions of HIF-1α, Bax, and Bcl-2 by Western blot. Results At 24 hours after culture, small amount of vacuoles necrotic cells could be observed in group A and group B; there was no significant difference in apoptosis rate between groups A and B ( t=1.026, P=0.471), and HIF-1α mRNA and protein expressions in group B were significantly higher than those in group A ( t=22.672, P=0.015; t=18.396, P=0.013), but, there was no significant difference in protein expressions of Bax and Bcl-2 between groups A and B ( t=0.594, P=0.781; t=1.251, P=0.342). The number of vacuolar necrosis cells in group D was significantly higher than that in group C, and HIF-1α positive cells were observed in group D. The apoptosis rate of group D was significantly higher than that of group C ( t=27.143, P=0.002). The mRNA expressions of HIF-1α, COL II, Aggrecan, and SOX9 in group D were significantly lower than those in group C ( t=21.097, P=0.015; t=34.829, P=0.002; t=18.673, P=0.022; t=31.949, P=0.007). The protein expressions of HIF-1α and Bcl-2 in group D were significantly lower than those in group C ( t=37.648, P=0.006; t=16.729, P=0.036), but the protein expression of Bax in group D was significantly higher than that in group C ( t=25.583, P=0.011). Conclusion HIF-1α mRNA expression is up-regulated under hypoxia condition, which will increase the hypoxia tolerance of endplate chondrocytes. Cell apoptosis is suppressed by the activation of HIF-1α in endplate chondrocytes under hypoxia condition.
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Affiliation(s)
- Zhigang Huang
- Department of Orthopedics, the Third People's Hospital of Shenzhen, Shenzhen Guangdong, 518112, P.R.China
| | - Yao Wang
- Department of Ultrasound, the Third People's Hospital of Shenzhen, Shenzhen Guangdong, 518112, P.R.China
| | - Ke Ma
- Department of Orthopedics, the Third People's Hospital of Shenzhen, Shenzhen Guangdong, 518112,
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