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Jiang P, Zhou X, Yang Y, Bai L. Pectolinarigenin targeting FGFR3 alleviates osteoarthritis progression by regulating the NF-κB/NLRP3 inflammasome pyroptotic pathway. Int Immunopharmacol 2024; 140:112741. [PMID: 39094365 DOI: 10.1016/j.intimp.2024.112741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 07/08/2024] [Accepted: 07/19/2024] [Indexed: 08/04/2024]
Abstract
OBJECTIVE Osteoarthritis (OA) is a chronic degenerative disease characterized by cartilage degeneration, involving inflammation, pyroptosis, and degeneration of the extracellular matrix (ECM). Pectolinarigenin (PEC) is a natural flavonoid with antioxidant, anti-inflammatory and anti-tumor properties. This study aims to explore the potential of PEC in ameliorating OA progression and its underlying mechanisms. METHODS Chondrocytes were exposed to 10 ng/mL IL-1β to simulate OA-like changes. The effect of PEC on IL-1β-treated chondrocytes was assessed using ELISA, western blot, and immunofluorescence. The mRNA sequencing (mRNA-seq) was employed to explore the possible targets of PEC in delaying OA progression. The OA mouse model was induced through anterior cruciate ligament transection (ACLT) and divided into sham, ACLT, ACLT+5 mg/kg PEC, and ACLT+10 mg/kg PEC groups. Micro-computed tomography and histological analysis were conducted to confirm the beneficial effects of PEC on OA in vivo. RESULTS PEC mitigated chondrocyte pyroptosis, as evidenced by reduced levels of pyroptosis-related proteins. Additionally, PEC attenuated IL-1β-mediated chondrocyte ECM degradation and inflammation. Mechanistically, mRNA-seq showed that FGFR3 was a downstream target of PEC. FGFR3 silencing reversed the beneficial effects of PEC on IL-1β-exposed chondrocytes. PEC exerted anti-pyroptotic, anti-ECM degradative, and anti-inflammatory effects through upregulating FGFR3 to inhibit the NF-κB/NLRP3 pyroptosis-related pathway. Consistently, in vivo experiments demonstrated the chondroprotective effects of PEC in OA mice. CONCLUSION PEC alleviate OA progression by FGFR3/NF-κB/NLRP3 pathway mediated chondrocyte pyroptosis, ECM degradation and inflammation, suggesting the potential of PEC as a therapeutic agent for OA.
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Affiliation(s)
- Peng Jiang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Xiaonan Zhou
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Yue Yang
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
| | - Lunhao Bai
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China.
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2
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Zhu C, Zhang L, Ding X, Wu W, Zou J. Non-coding RNAs as regulators of autophagy in chondrocytes: Mechanisms and implications for osteoarthritis. Ageing Res Rev 2024; 99:102404. [PMID: 38971322 DOI: 10.1016/j.arr.2024.102404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 06/22/2024] [Accepted: 07/01/2024] [Indexed: 07/08/2024]
Abstract
Osteoarthritis (OA) is a chronic degenerative joint disease with multiple causative factors such as aging, mechanical injury, and obesity. Autophagy is a complex dynamic process that is involved in the degradation and modification of intracellular proteins and organelles under different pathophysiological conditions. Autophagy, as a cell survival mechanism under various stress conditions, plays a key role in regulating chondrocyte life cycle metabolism and cellular homeostasis. Non-coding RNAs (ncRNAs) are heterogeneous transcripts that do not possess protein-coding functions, but they can act as effective post-transcriptional and epigenetic regulators of gene and protein expression, thus participating in numerous fundamental biological processes. Increasing evidence suggests that ncRNAs, autophagy, and their crosstalk play crucial roles in OA pathogenesis. Therefore, we summarized the complex role of autophagy in OA chondrocytes and focused on the regulatory role of ncRNAs in OA-associated autophagy to elucidate the complex pathological mechanisms of the ncRNA-autophagy network in the development of OA, thus providing new research targets for the clinical diagnosis and treatment of OA.
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Affiliation(s)
- Chenyu Zhu
- School of Exercise and Health, Shanghai University of Sport, Shanghai 200438, China
| | - Lingli Zhang
- School of Athletic Performance, Shanghai University of Sport, Shanghai 200438, China
| | - Xiaoqing Ding
- School of Athletic Performance, Shanghai University of Sport, Shanghai 200438, China
| | - Wei Wu
- School of Athletic Performance, Shanghai University of Sport, Shanghai 200438, China.
| | - Jun Zou
- School of Exercise and Health, Shanghai University of Sport, Shanghai 200438, China.
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3
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Kim YJ, Han J, Han S. The Interplay Between Endoplasmic Reticulum Stress and Oxidative Stress in Chondrocyte Catabolism. Cartilage 2024:19476035241245803. [PMID: 38641979 DOI: 10.1177/19476035241245803] [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: 04/21/2024] Open
Abstract
OBJECTIVE Oxidative stress and endoplasmic reticulum (ER) stress play pivotal roles in disrupting the homeostasis of chondrocytes by producing catalytic proteases and enhancing chondrocyte senescence, consequently contributing to the progression of osteoarthritis (OA). Despite their close interaction, the underlying molecular mechanisms remain poorly understood. Here, we show that ER stress and oxidative stress reciprocally modulate each other to promote cartilage degradation. METHODS Primary chondrocytes were obtained from the articular cartilage of 5-day-old C57BL/6J mice by excising distal femur and proximal tibia. Tunicamycin was applied to induce ER stress in primary chondrocytes. Surgical OA was induced in 12-week-old male C57BL/6J mice by destabilizing the medial meniscus (DMM). RESULTS Tunicamycin-induced ER stress led to an increase in the production of reactive oxygen species (ROS) and catalytic proteases, including MMP13 and Adamts5, in primary chondrocytes, and it was primarily dependent on the NADPH oxidase (NOX) system. ER stress directly increased the expression of NOX2, NOX3, NOX4, and p22phox. Specifically, the protein kinase RNA-like ER kinase (PERK) pathway is involved in the expression of NOX4 and p22phox, the inositol-requiring enzyme 1 alpha (IRE1α) pathway in NOX2 and NOX3 expression, and the activating transcription factor 6 (ATF6) pathway influences NOX3 expression in chondrocytes. Conversely, inhibiting NOX function significantly reduced both ER stress sensor-related signaling and chondrocyte catabolism, thereby decelerating the progression of surgically induced OA in vivo. CONCLUSIONS Our findings highlight the positive feedback loop between ER stress and oxidative stress in OA pathogenesis, suggesting that targeting NOX isoforms is a promising therapeutic strategy for OA.
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Affiliation(s)
- Yu Jung Kim
- Laboratory for Arthritis and Cartilage Biology, Research Institute of Aging and Metabolism, Kyungpook National University, Daegu, Republic of Korea
| | - Jin Han
- Laboratory for Arthritis and Cartilage Biology, Research Institute of Aging and Metabolism, Kyungpook National University, Daegu, Republic of Korea
| | - Seungwoo Han
- Laboratory for Arthritis and Cartilage Biology, Research Institute of Aging and Metabolism, Kyungpook National University, Daegu, Republic of Korea
- Division of Rheumatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
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4
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Direct comparison of non-osteoarthritic and osteoarthritic synovial fluid-induced intracellular chondrocyte signaling and phenotype changes. Osteoarthritis Cartilage 2023; 31:60-71. [PMID: 36150677 DOI: 10.1016/j.joca.2022.09.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 09/02/2022] [Accepted: 09/09/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Since the joint microenvironment and tissue homeostasis are highly dependent on synovial fluid, we aimed to compare the essential chondrocyte signaling signatures of non-osteoarthritic vs end-stage osteoarthritic knee synovial fluid. Moreover, we determined the phenotypic consequence of the distinct signaling patterns on articular chondrocytes. METHODS Protein profiling of synovial fluid was performed using antibody arrays. Chondrocyte signaling and phenotypic changes induced by non-osteoarthritic and osteoarthritic synovial fluid were analyzed using a phospho-kinase array, luciferase-based transcription factor activity assays, and RT-qPCR. The origin of osteoarthritic synovial fluid signaling was evaluated by comparing the signaling responses of conditioned media from cartilage, synovium, infrapatellar fat pad and meniscus. Osteoarthritic synovial fluid induced pathway-phenotype relationships were evaluated using pharmacological inhibitors. RESULTS Compared to non-osteoarthritic synovial fluid, osteoarthritic synovial fluid was enriched in cytokines, chemokines and growth factors that provoked differential MAPK, AKT, NFκB and cell cycle signaling in chondrocytes. Functional pathway analysis confirmed increased activity of these signaling events upon osteoarthritic synovial fluid stimulation. Tissue secretomes of osteoarthritic cartilage, synovium, infrapatellar fat pad and meniscus activated several inflammatory signaling routes. Furthermore, the distinct pathway signatures of osteoarthritic synovial fluid led to accelerated chondrocyte dedifferentiation via MAPK/ERK signaling, increased chondrocyte fibrosis through MAPK/JNK and PI3K/AKT activation, an elevated inflammatory response mediated by cPKC/NFκB, production of extracellular matrix-degrading enzymes by MAPK/p38 and PI3K/AKT routes, and enabling of chondrocyte proliferation. CONCLUSION This study provides the first mechanistic comparison between non-osteoarthritic and osteoarthritic synovial fluid, highlighting MAPKs, cPKC/NFκB and PI3K/AKT as crucial OA-associated intracellular signaling routes.
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Shentu CY, Yan G, Xu DC, Chen Y, Peng LH. Emerging pharmaceutical therapeutics and delivery technologies for osteoarthritis therapy. Front Pharmacol 2022; 13:945876. [PMID: 36467045 PMCID: PMC9712996 DOI: 10.3389/fphar.2022.945876] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 11/03/2022] [Indexed: 10/03/2023] Open
Abstract
Osteoarthritis (OA) is one of the most common joint degenerative diseases in the world. At present, the management of OA depends on the lifestyle modification and joint replacement surgery, with the lifespan of prosthesis quite limited yet. Effective drug treatment of OA is essential. However, the current drugs, such as the non-steroidal anti-inflammatory drugs and acetaminophen, as well as glucosamine, chondroitin sulfate, hyaluronic acid, are accompanied by obvious side effects, with the therapeutic efficacy to be enhanced. Recently, novel reagents such as IL-1 antagonists and nerve growth factor inhibitors have entered clinical trials. Moreover, increasing evidence demonstrated that active ingredients of natural plants have great potential for treating OA. Meanwhile, the use of novel drug delivery strategies may overcome the shortcomings of conventional preparations and enhance the bioavailability of drugs, as well as decrease the side effects significantly. This review therefore summarizes the pathological mechanisms, management strategies, and research progress in the drug molecules including the newly identified active ingredient derived from medicinal plants for OA therapy, with the drug delivery technologies also summarized, with the expectation to provide the summary and outlook for developing the next generation of drugs and preparations for OA therapy.
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Affiliation(s)
- Cheng-Yu Shentu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Ge Yan
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Dong-Chen Xu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Yong Chen
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
| | - Li-Hua Peng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, China
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, Macau SAR, China
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6
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Zheng M, Okawa S, Bravo M, Chen F, Martínez-Chantar ML, del Sol A. ChemPert: mapping between chemical perturbation and transcriptional response for non-cancer cells. Nucleic Acids Res 2022; 51:D877-D889. [PMID: 36200827 PMCID: PMC9825489 DOI: 10.1093/nar/gkac862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 09/08/2022] [Accepted: 09/25/2022] [Indexed: 01/30/2023] Open
Abstract
Prior knowledge of perturbation data can significantly assist in inferring the relationship between chemical perturbations and their specific transcriptional response. However, current databases mostly contain cancer cell lines, which are unsuitable for the aforementioned inference in non-cancer cells, such as cells related to non-cancer disease, immunology and aging. Here, we present ChemPert (https://chempert.uni.lu/), a database consisting of 82 270 transcriptional signatures in response to 2566 unique perturbagens (drugs, small molecules and protein ligands) across 167 non-cancer cell types, as well as the protein targets of 57 818 perturbagens. In addition, we develop a computational tool that leverages the non-cancer cell datasets, which enables more accurate predictions of perturbation responses and drugs in non-cancer cells compared to those based onto cancer databases. In particular, ChemPert correctly predicted drug effects for treating hepatitis and novel drugs for osteoarthritis. The ChemPert web interface is user-friendly and allows easy access of the entire datasets and the computational tool, providing valuable resources for both experimental researchers who wish to find datasets relevant to their research and computational researchers who need comprehensive non-cancer perturbation transcriptomics datasets for developing novel algorithms. Overall, ChemPert will facilitate future in silico compound screening for non-cancer cells.
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Affiliation(s)
| | | | - Miren Bravo
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Derio, Spain,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 48160 Bizkaia, Spain
| | - Fei Chen
- German Research Center for Artificial Intelligence (DFKI), 66123 Saarbrücken, Germany
| | - María-Luz Martínez-Chantar
- Liver Disease Laboratory, Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Derio, Spain,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), 48160 Bizkaia, Spain
| | - Antonio del Sol
- To whom correspondence should be addressed. Tel: +352 46 66 44 6982;
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Kiil RM, Mistegaard CE, Loft AG, Zejden A, Hendricks O, Jurik AG. Differences in topographical location of sacroiliac joint MRI lesions in patients with early axial spondyloarthritis and mechanical back pain. Arthritis Res Ther 2022; 24:75. [PMID: 35331320 PMCID: PMC8944150 DOI: 10.1186/s13075-022-02760-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 03/07/2022] [Indexed: 12/24/2022] Open
Abstract
Background Early diagnostics of axial spondyloarthritis (axSpA) remains a challenge. Traditional imaging one-plane sacroiliac joint (SIJ) MRI assessment is used. By introducing a two-plane assessment system, the objective was to analyse the differences in SIJ MRI changes in early axSpA compared with changes in patients with mechanical back pain (MBP) by exploring the differences in volume and location. Methods MRIs in the early diagnostic state of 25 axSpA patients (mean age 31.3 years) and 59 MBP patients (mean age 32.3 years) were included. The MRIs were assessed by two readers regarding the distribution of bone marrow edema (BME) in 14 joint portions and structural changes in six joint portions in addition to SIJ anatomical variations and lumbar spine disc degeneration. Results AxSpA patients had a significantly higher overall BME sumscore (volume) of 25.1 compared to MBP patients 6.8, p < 0.005. The MBP group had the highest prevalence (66%) and sumscore (5.7) in the middle anterior sacrum. The axSpA group had significantly higher prevalence and sumscores in all joint portions except the three cartilaginous anterior sacral joint portions, including the ligamentous compartments (prevalence 40–60% compared to 8–15%, p both < 0.005). The axSpA group had also a significantly higher prevalence of erosions and fatty marrow disposition, but there were no differences in the prevalence of anatomical variations except the bipartite iliac bony plate. Conclusions AxSpA patients demonstrated a widespread distribution of both inflammatory and structural changes, including high BME occurrence in the ligamentous joint portions whereas patients with MBP had the highest occurrence of BME in the middle anterior sacrum. These findings may help differentiate axSpA patients from other back pain conditions in the early diagnostic phase.
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Affiliation(s)
- Rosa Marie Kiil
- Department of Radiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 35, C105, 8200, Aarhus N, Denmark. .,Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 103, 8200, Aarhus N, Denmark. .,Institute of Regional Health Research, University of Southern Denmark, Winsloewparken 19, 5000, Odense C, Denmark.
| | - Clara E Mistegaard
- Institute of Regional Health Research, University of Southern Denmark, Winsloewparken 19, 5000, Odense C, Denmark.,Department of Rheumatology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 59, 8200, Aarhus N, Denmark
| | - Anne Gitte Loft
- Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 103, 8200, Aarhus N, Denmark.,Department of Rheumatology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 59, 8200, Aarhus N, Denmark
| | - Anna Zejden
- Department of Radiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 35, C105, 8200, Aarhus N, Denmark
| | - Oliver Hendricks
- Institute of Regional Health Research, University of Southern Denmark, Winsloewparken 19, 5000, Odense C, Denmark.,Danish Hospital for Rheumatic Diseases, Engelshøjgade 9A, 6400, Sønderborg, Denmark
| | - Anne Grethe Jurik
- Department of Radiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 35, C105, 8200, Aarhus N, Denmark.,Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 103, 8200, Aarhus N, Denmark.,Institute of Regional Health Research, University of Southern Denmark, Winsloewparken 19, 5000, Odense C, Denmark
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8
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Identification of circRNA Expression Profiles in BMSCs from Glucocorticoid-Induced Osteoporosis Model. Stem Cells Int 2022; 2022:3249737. [PMID: 35154330 PMCID: PMC8837445 DOI: 10.1155/2022/3249737] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 01/09/2022] [Indexed: 02/07/2023] Open
Abstract
Background. Circular RNAs (circRNAs) contribute to the regulation of many diseases. However, little is known about the role of circRNAs in the development of glucocorticoid-induced osteoporosis (GIOP). The present study is aimed at systematically characterizing the circRNA expression profiles in GIOP and predict the potential functions of the associated regulatory networks. Methods. A small animal GIOP model was developed in Sprague-Dawley rats given daily intraperitoneal doses of the synthetic glucocorticoid dexamethasone. Micro-CT and bone histomorphometry were performed to characterize the bone loss. Alizarin red S (ARS) staining and alkaline phosphatase (ALP) activity were assessed to determine the osteogenic differentiation potential of BMSCs. RNA sequencing was performed to identify differentially expressed circRNAs in BMSCs between the GIOP and normal groups, which were validated by qRT-PCR. siRNA interference experiments were used to demonstrate their function. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were performed to predict the functions of differentially expressed circRNAs. The microRNA (miRNA) targets of the circRNAs and circRNA-miRNA interactions were predicted. Results. Micro-CT and bone histomorphometry confirmed the rat GIOP model. Both ARS intensity and ALP activity were decreased in GIOP BMSCs. Seventeen circRNAs were identified by
,
, and
, of which 7 were upregulated and 10 were downregulated. The qRT-PCR results of the selected circRNAs were consistent with the RNA-seq results and showed that circARSB and circAKT3 were significantly upregulated, while circPTEN and circTRPM7 were downregulated in the GIOP group. Further functional experiments found that downregulation of circARSB and circPTEN expression resulted in a corresponding change in osteogenic differentiation, suggesting that circARSB negatively, while circPTEN positively, regulates BMSC osteogenic differentiation. Analysis of circRNA-targeted miRNAs predicted that miR-135a-5p was associated with circARSB and circAKT3, and miR-881-3p was associated with circPTEN and circTRPM7. Furthermore, the signalling pathways associated with these differentially expressed circRNAs were predicted. Conclusions. The present study identified circARSB, circAKT3, circPTEN, and circTRPM7 as being associated with osteogenic differentiation during GIOP through a circRNA-targeted miRNA-mRNA axis, which might provide insight into the pathophysiological mechanism of GIOP.
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9
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Song C, Guo Y, Chen F, Liu W. LncRNA MALAT1 promotes osteogenic differentiation through the miR-217/AKT3 axis: a possible strategy to alleviate osteoporosis. J Gene Med 2022; 24:e3409. [PMID: 35030644 DOI: 10.1002/jgm.3409] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 08/27/2021] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Accumulating evidence demonstrates that long non-coding RNAs (lncRNAs) are associated with the development of osteoporosis. This study aimed to investigate the effect of MALAT1 on osteogenic differentiation in osteoporosis. METHODS The MALAT1 levels were detected by Real-time Polymerase Chain Reaction (RT-qPCR). Moreover, the levels of osteogenic differentiation-related factors (Bmp4, Col1a1, and Spp1) were measured by RT-qPCR and western blot. Alkaline phosphatase (ALP) activity was detected using ALP staining assay. RESULTS The MALAT1 levels were downregulated in hindlimb unloading (HU) mice and simulated microgravity (MG) treated MC3T3-E1 cells. Moreover, MG treatment induced the downregulation of the expression of ALP, BMP4, Col1a1 and Spp1, while overexpression of MALAT1 abolished the downregulation. MG also inhibited ALP activity, while MALAT1 reversed the effect. Furthermore, miR-217 was identified as a target of MALAT1, and AKT3 was verified as a target of miR-217. Overexpression of miR-217 rescued the promotion of osteogenic differentiation induced by MALAT1 in MG treated cells. Knockdown of AKT3 abolished the facilitation of osteogenic differentiation induced by downregulation of miR-217. CONCLUSION MALAT1 promotes osteogenic differentiation through regulating miR-217/AKT3 axis, suggesting that MALAT1 is a potential target to alleviate osteoporosis.
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Affiliation(s)
- Chenyang Song
- Department of orthopedics, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - Yu Guo
- Department of orthopedics, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - Fenyong Chen
- Department of orthopedics, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
| | - Wenge Liu
- Department of orthopedics, Fujian Medical University Union Hospital, Fuzhou, Fujian, China
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Abstract
PURPOSE OF REVIEW Translation of genetic information encoded within mRNA molecules by ribosomes into proteins is a key part of the central dogma of molecular biology. Despite the central position of the ribosome in the translation of proteins, and considering the major proteomic changes that occur in the joint during osteoarthritis development and progression, the ribosome has received very limited attention as driver of osteoarthritis pathogenesis. RECENT FINDINGS We provide an overview of the limited literature regarding this developing topic for the osteoarthritis field. Recent key findings that connect ribosome biogenesis and activity with osteoarthritis include: ribosomal RNA transcription, processing and maturation, ribosomal protein expression, protein translation capacity and preferential translation. SUMMARY The ribosome as the central cellular protein synthesis hub is largely neglected in osteoarthritis research. Findings included in this review reveal that in osteoarthritis, ribosome aberrations have been found from early-stage ribosome biogenesis, through ribosome build-up and maturation, up to preferential translation. Classically, osteoarthritis has been explained as an imbalance between joint tissue anabolism and catabolism. We postulate that osteoarthritis can be interpreted as an acquired ribosomopathy. This hypothesis fine-tunes the dogmatic anabolism/katabolism point-of-view, and may provide novel molecular opportunities for the development of osteoarthritis disease-modifying treatments.
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Affiliation(s)
- Guus G.H. van den Akker
- Laboratory for Experimental Orthopedics, Department of Orthopedic Surgery, Maastricht University
| | - Marjolein M.J. Caron
- Laboratory for Experimental Orthopedics, Department of Orthopedic Surgery, Maastricht University
| | - Mandy J. Peffers
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK
| | - Tim J.M. Welting
- Laboratory for Experimental Orthopedics, Department of Orthopedic Surgery, Maastricht University
- Laboratory for Experimental Orthopedics, Department of Orthopedic Surgery, Maastricht University Medical Center, Maastricht, the Netherlands
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11
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Thomson A, Hilkens CMU. Synovial Macrophages in Osteoarthritis: The Key to Understanding Pathogenesis? Front Immunol 2021; 12:678757. [PMID: 34211470 PMCID: PMC8239355 DOI: 10.3389/fimmu.2021.678757] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/30/2021] [Indexed: 11/13/2022] Open
Abstract
Effective treatment of osteoarthritis (OA) remains a huge clinical challenge despite major research efforts. Different tissues and cell-types within the joint contribute to disease pathogenesis, and there is great heterogeneity between patients in terms of clinical features, genetic characteristics and responses to treatment. Inflammation and the most abundant immune cell type within the joint, macrophages, have now been recognised as possible players in disease development and progression. Here we discuss recent findings on the involvement of synovial inflammation and particularly the role of synovial macrophages in OA pathogenesis. Understanding macrophage involvement may hold the key for improved OA treatments.
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Affiliation(s)
| | - Catharien M. U. Hilkens
- Immunotherapy Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle Upon Tyne, United Kingdom
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12
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Lamplot JD, Rai MF, Tompkins WP, Friedman MV, Schmidt EJ, Sandell LJ, Brophy RH. Gene Expression in Meniscal Tears at the Time of Arthroscopic Partial Meniscectomy Predicts the Progression of Osteoarthritis Within 6 Years of Surgery. Orthop J Sports Med 2020; 8:2325967120936275. [PMID: 32923494 PMCID: PMC7446268 DOI: 10.1177/2325967120936275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 12/23/2019] [Indexed: 12/13/2022] Open
Abstract
Background: While knees with meniscal tears are associated with a heightened risk of developing osteoarthritis (OA), it is difficult to predict which patients are at the greatest risk for OA. Gene signatures in menisci that are resected during arthroscopic partial meniscectomy (APM) may provide insight into the risk of OA progression. Hypothesis: Meniscal gene signatures at the time of APM will predict radiographic OA progression. Study Design: Case series; Level of evidence, 4. Methods: Meniscal fragments were collected from 38 patients without OA during clinically indicated APM of the medial meniscus. The expression of 28 candidate genes with known roles in cartilage homeostasis, OA, extracellular matrix degradation, and obesity was assessed by quantitative real-time polymerase chain reaction. Weightbearing radiographs obtained before surgery and at final follow-up were graded by a musculoskeletal radiologist using the Kellgren-Lawrence classification of OA. The association of meniscal gene expression at baseline with the progression of radiographic OA was determined. Results: Gene expression and baseline and follow-up radiographic data were available from 31 patients (81.6%) at a mean follow-up of 6.2 ± 1.3 years. Patients without OA progression had significantly higher expression of 7 genes: MMP9 (5.1-fold; P = .002), IL8 (2.9-fold; P = .016), CCL3 (3.7-fold; P = .032), CCL3L1 (4.5-fold; P = .008), CXCL6 (6.2-fold; P = .010), LEP (5.2-fold; P = .004), and RETN (46-fold; P = .008). Conclusion: Gene expression in the meniscus at the time of APM may be associated with the risk for progression of OA after surgery. Elevated expression of the aforementioned genes may reflect a chondroprotective response. Stratifying the risk for OA progression after APM could facilitate targeted interventions to delay or prevent the development of OA. Further studies in a larger cohort with an extended follow-up, and inclusion of additional genes, are warranted to better characterize this association.
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Affiliation(s)
- Joseph D Lamplot
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Muhammad Farooq Rai
- Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, Missouri, USA.,Department of Cell Biology & Physiology, Washington University School of Medicine, St Louis, Missouri, USA
| | - William P Tompkins
- Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, Missouri, USA
| | - Michael V Friedman
- Mallinckrodt Institute of Radiology, Washington University School of Medicine, St Louis, Missouri, USA
| | - Eric J Schmidt
- Department of Health Sciences, University of Lynchburg, Lynchburg, Virginia, USA
| | - Linda J Sandell
- Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, Missouri, USA.,Department of Cell Biology & Physiology, Washington University School of Medicine, St Louis, Missouri, USA
| | - Robert H Brophy
- Department of Orthopaedic Surgery, Washington University School of Medicine, St Louis, Missouri, USA
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Impaired chondrocyte U3 snoRNA expression in osteoarthritis impacts the chondrocyte protein translation apparatus. Sci Rep 2020; 10:13426. [PMID: 32778764 PMCID: PMC7417995 DOI: 10.1038/s41598-020-70453-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 07/23/2020] [Indexed: 12/18/2022] Open
Abstract
Although pathways controlling ribosome activity have been described to regulate chondrocyte homeostasis in osteoarthritis, ribosome biogenesis in osteoarthritis is unexplored. We hypothesized that U3 snoRNA, a non-coding RNA involved in ribosomal RNA maturation, is critical for chondrocyte protein translation capacity in osteoarthritis. U3 snoRNA was one of a number of snoRNAs with decreased expression in osteoarthritic cartilage and osteoarthritic chondrocytes. OA synovial fluid impacted U3 snoRNA expression by affecting U3 snoRNA gene promoter activity, while BMP7 was able to increase its expression. Altering U3 snoRNA expression resulted in changes in chondrocyte phenotype. Interference with U3 snoRNA expression led to reduction of rRNA levels and translational capacity, whilst induced expression of U3 snoRNA was accompanied by increased 18S and 28S rRNA levels and elevated protein translation. Whole proteome analysis revealed a global impact of reduced U3 snoRNA expression on protein translational processes and inflammatory pathways. For the first time we demonstrate implications of a snoRNA in osteoarthritis chondrocyte biology and investigated its role in the chondrocyte differentiation status, rRNA levels and protein translational capacity.
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14
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Hwang HS, Lee MH, Kim HA. TGF-β1-induced expression of collagen type II and ACAN is regulated by 4E-BP1, a repressor of translation. FASEB J 2020; 34:9531-9546. [PMID: 32485037 DOI: 10.1096/fj.201903003r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 04/01/2020] [Accepted: 05/08/2020] [Indexed: 12/30/2022]
Abstract
Eukaryotic initiation factor 4E (eIF4E)-binding protein 1 (4E-BP1) binds eIF4E and represses protein translation by displacing it from the mRNA. In this study, we investigated the influence of 4E-BP1 translational apparatus on the regulation of transforming growth factor-beta 1 (TGF-β1)-induced anabolic signaling in chondrocytes. The level of 4E-BP1 expression was significantly higher in human OA cartilage than normal cartilage. TGF-β1 increased total protein synthesis, including aggrecan (ACAN) and collagen type II (Col II), together with activation of Akt/mTOR signaling pathway. mTOR silencing significantly suppressed ACAN and Col II expressions through decreasing TGF-β1-induced phosphorylation of 4E-BP1. On the contrary, 4E-BP1 knockdown promoted total protein synthesis but suppressed Col II and ACAN expressions with decreased expression of Smad2/3 and Smad4 and increased expression of inhibitory Smad6 and Smad7. TGF-β1 suppressed the interaction of 4E-BP1 and eIF4E and subsequently enhanced protein synthesis. Furthermore, 4E-BP1 regulated translation levels of inhibitory Smads, which decreased the accumulation of nuclear Smad2/3 complexes on the promoter of ACAN and Col II genes, subsequently affecting transcription of ACAN and Col II. These results demonstrated that TGF-β1-modulated phosphorylation of 4EBP1 plays a role in the expression of Col II and ACAN through differential alteration of Smad signaling pathway.
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Affiliation(s)
- Hyun Sook Hwang
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Kyunggi, Korea.,Institute for Skeletal Aging, Hallym University, Chunchon, Korea
| | - Mi Hyun Lee
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Kyunggi, Korea.,Institute for Skeletal Aging, Hallym University, Chunchon, Korea
| | - Hyun Ah Kim
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Kyunggi, Korea.,Institute for Skeletal Aging, Hallym University, Chunchon, Korea
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Han T, Mignatti P, Abramson SB, Attur M. Periostin interaction with discoidin domain receptor-1 (DDR1) promotes cartilage degeneration. PLoS One 2020; 15:e0231501. [PMID: 32330138 PMCID: PMC7182230 DOI: 10.1371/journal.pone.0231501] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 03/24/2020] [Indexed: 11/18/2022] Open
Abstract
Osteoarthritis (OA) is characterized by progressive loss of articular cartilage accompanied by the new bone formation and, often, a synovial proliferation that culminates in pain, loss of joint function, and disability. However, the cellular and molecular mechanisms of OA progression and the relative contributions of cartilage, bone, and synovium remain unclear. We recently found that the extracellular matrix (ECM) protein periostin (Postn, or osteoblast-specific factor, OSF-2) is expressed at high levels in human OA cartilage. Multiple groups have also reported elevated expression of Postn in several rodent models of OA. We have previously reported that in vitro Postn promotes collagen and proteoglycan degradation in human chondrocytes through AKT/β-catenin signaling and downstream activation of MMP-13 and ADAMTS4 expression. Here we show that Postn induces collagen and proteoglycan degradation in cartilage by signaling through discoidin domain receptor-1 (DDR1), a receptor tyrosine kinase. The genetic deficiency or pharmacological inhibition of DDR1 in mouse chondrocytes blocks Postn-induced MMP-13 expression. These data show that Postn is signaling though DDR1 is mechanistically involved in OA pathophysiology. Specific inhibitors of DDR1 may provide therapeutic opportunities to treat OA.
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Affiliation(s)
- Tianzhen Han
- Division of Rheumatology, Department of Medicine, NYU Grossman School of Medicine, NYU Langone Orthopedic Hospital, New York, NY, United States of America
| | - Paolo Mignatti
- Division of Rheumatology, Department of Medicine, NYU Grossman School of Medicine, NYU Langone Orthopedic Hospital, New York, NY, United States of America
| | - Steven B. Abramson
- Division of Rheumatology, Department of Medicine, NYU Grossman School of Medicine, NYU Langone Orthopedic Hospital, New York, NY, United States of America
| | - Mukundan Attur
- Division of Rheumatology, Department of Medicine, NYU Grossman School of Medicine, NYU Langone Orthopedic Hospital, New York, NY, United States of America
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16
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Pathomechanisms of Posttraumatic Osteoarthritis: Chondrocyte Behavior and Fate in a Precarious Environment. Int J Mol Sci 2020; 21:ijms21051560. [PMID: 32106481 PMCID: PMC7084733 DOI: 10.3390/ijms21051560] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 02/18/2020] [Accepted: 02/21/2020] [Indexed: 02/07/2023] Open
Abstract
Traumatic injuries of the knee joint result in a wide variety of pathomechanisms, which contribute to the development of so-called posttraumatic osteoarthritis (PTOA). These pathogenetic processes include oxidative stress, excessive expression of catabolic enzymes, release of damage-associated molecular patterns (DAMPs), and synovial inflammation. The present review focuses on the underlying pathomechanisms of PTOA and in particular the behavior and fate of the surviving chondrocytes, comprising chondrocyte metabolism, regulated cell death, and phenotypical changes comprising hypertrophy and senescence. Moreover, possible therapeutic strategies, such as chondroanabolic stimulation, anti-oxidative and anti-inflammatory treatment, as well as novel therapeutic targets are discussed.
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McDermott BT, Peffers MJ, McDonagh B, Tew SR. Translational regulation contributes to the secretory response of chondrocytic cells following exposure to interleukin-1β. J Biol Chem 2019; 294:13027-13039. [PMID: 31300557 PMCID: PMC6721953 DOI: 10.1074/jbc.ra118.006865] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 06/12/2019] [Indexed: 01/18/2023] Open
Abstract
Osteoarthritis is a chronic disease characterized by the loss of articular cartilage in synovial joints through a process of extracellular matrix destruction that is strongly associated with inflammatory stimuli. Chondrocytes undergo changes to their protein translational capacity during osteoarthritis, but a study of how disease-relevant signals affect chondrocyte protein translation at the transcriptomic level has not previously been performed. In this study, we describe how the inflammatory cytokine interleukin 1-β (IL-1β) rapidly affects protein translation in the chondrocytic cell line SW1353. Using ribosome profiling we demonstrate that IL-1β induced altered translation of inflammatory-associated transcripts such as NFKB1, TNFAIP2, MMP13, CCL2, and CCL7, as well as a number of ribosome-associated transcripts, through differential translation and the use of multiple open reading frames. Proteomic analysis of the cellular layer and the conditioned media of these cells identified changes in a number of the proteins that were differentially translated. Translationally regulated secreted proteins included a number of chemokines and cytokines, underlining the rapid, translationally mediated inflammatory cascade that is initiated by IL-1β. Although fewer cellular proteins were found to be regulated in both ribosome profiling and proteomic data sets, we did find increased levels of SOD2, indicative of redox changes within SW1353 cells being modulated at the translational level. In conclusion, we have produced combined ribosome profiling and proteomic data sets that provide a valuable resource in understanding the processes that occur during cytokine stimulation of chondrocytic cells.
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Affiliation(s)
- Benjamin T McDermott
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, United Kingdom.
| | - Mandy J Peffers
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, United Kingdom
| | - Brian McDonagh
- Department of Physiology, School of Medicine, National University of Ireland (NUI), Galway H91 TK33, Ireland
| | - Simon R Tew
- Department of Musculoskeletal Biology, Institute of Ageing and Chronic Disease, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, United Kingdom
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18
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Zhang Y, Wang F, Chen G, He R, Yang L. LncRNA MALAT1 promotes osteoarthritis by modulating miR-150-5p/AKT3 axis. Cell Biosci 2019; 9:54. [PMID: 31304004 PMCID: PMC6600894 DOI: 10.1186/s13578-019-0302-2] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/07/2019] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Many studies have reported that long noncoding RNAs (lncRNAs) could act as sponges for microRNAs (miRNAs) and play important roles in the regulation of osteoarthritis (OA). Yet, the underlying mechanisms of lncRNA metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) in OA are still unclear. Therefore, we aimed to explore the regulation mechanisms of MALAT1 in OA procession. METHODS IL-1β treatment in chondrocyte was used to mimic OA in vitro. MALAT1, miR-150-5p and AKT3 expression levels were detected via qRT-PCR. The protein levels of AKT3, MMP-13, ADAMTS-5, Bax, Bcl-2, cleaved-PARP, collagen II and aggracan were measured by western blot. MTT assay was performed to detect cell proliferation ability. The apoptosis of chondrocytes was determined using flow cytometry and western blot. Luciferase assay and RNA immunoprecipitation (RIP) assays were used to confirm the relationship among MALAT1, miR-150-5p and AKT3. RESULTS In our study, MALAT1 and AKT3 were upregulated while miR-150-5p was downregulated in OA in vitro and vivo. The level of miR-150-5p was negatively correlated with that of MALAT1 or AKT3. More importantly, overexpression of MALAT1 promoted the expression of AKT3 by negatively regulating miR-150-5p. MALAT1 knockdown inhibited cell proliferation, promoted apoptosis, increased MMP-13, ADAMTS-5 expression and decreased collagen II, aggracan expression in IL-1β treated chondrocytes. MALAT1 upregulation or AKT3 overexpression enhanced proliferation, inhibited apoptosis and extracellular matrix (ECM) degradation, which was undermined by overexpression of miR-150-5p. By contrast, miR-150-5p depletion rescued the effect of MALAT1 downregulation or loss of AKT3 on IL-1β-stimulated chondrocytes. CONCLUSION MALAT1 was responsible for cell proliferation, apoptosis, and ECM degradation via miR-150-5p/AKT3 axis.
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Affiliation(s)
- Ying Zhang
- Center for Joint Surgery, Southwest Hospital, The Third Military Medical University (Army Medical University), 30 Gaotanyan Main St., Shapingba Dist., Chongqing, 400038 People’s Republic of China
| | - Fuyou Wang
- Center for Joint Surgery, Southwest Hospital, The Third Military Medical University (Army Medical University), 30 Gaotanyan Main St., Shapingba Dist., Chongqing, 400038 People’s Republic of China
| | - Guangxing Chen
- Center for Joint Surgery, Southwest Hospital, The Third Military Medical University (Army Medical University), 30 Gaotanyan Main St., Shapingba Dist., Chongqing, 400038 People’s Republic of China
| | - Rui He
- Center for Joint Surgery, Southwest Hospital, The Third Military Medical University (Army Medical University), 30 Gaotanyan Main St., Shapingba Dist., Chongqing, 400038 People’s Republic of China
| | - Liu Yang
- Center for Joint Surgery, Southwest Hospital, The Third Military Medical University (Army Medical University), 30 Gaotanyan Main St., Shapingba Dist., Chongqing, 400038 People’s Republic of China
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Freedman BR, Mooney DJ. Biomaterials to Mimic and Heal Connective Tissues. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806695. [PMID: 30908806 PMCID: PMC6504615 DOI: 10.1002/adma.201806695] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 01/27/2019] [Indexed: 05/11/2023]
Abstract
Connective tissue is one of the four major types of animal tissue and plays essential roles throughout the human body. Genetic factors, aging, and trauma all contribute to connective tissue dysfunction and motivate the need for strategies to promote healing and regeneration. The goal here is to link a fundamental understanding of connective tissues and their multiscale properties to better inform the design and translation of novel biomaterials to promote their regeneration. Major clinical problems in adipose tissue, cartilage, dermis, and tendon are discussed that inspire the need to replace native connective tissue with biomaterials. Then, multiscale structure-function relationships in native soft connective tissues that may be used to guide material design are detailed. Several biomaterials strategies to improve healing of these tissues that incorporate biologics and are biologic-free are reviewed. Finally, important guidance documents and standards (ASTM, FDA, and EMA) that are important to consider for translating new biomaterials into clinical practice are highligted.
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Affiliation(s)
- Benjamin R Freedman
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - David J Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
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20
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Hwang HS, Choi MH, Kim HA. 29-kDa FN-f inhibited autophagy through modulating localization of HMGB1 in human articular chondrocytes. BMB Rep 2019. [PMID: 29804557 PMCID: PMC6235092 DOI: 10.5483/bmbrep.2018.51.10.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Fibronectin fragments found in the synovial fluid of patients with osteoarthritis (OA) induce the catabolic responses in cartilage. Nuclear high-mobility group protein Box 1 (HMGB1), a damage-associated molecular pattern, is responsible for the regulation of signaling pathways related to cell death and survival in response to various stimuli. In this study, we investigated whether changes induced by 29-kDa aminoterminal fibronectin fragment (29-kDa FN-f) in HMGB1 expression influences the pathogenesis of OA via an HMGB1- modulated autophagy signaling pathway. Human articular chondrocytes were enzymatically isolated from articular cartilage. The level of mRNA was measured by quantitative real-time PCR. The expression of proteins was examined by western blot analysis, immnunofluorescence assay, and enzyme-linked immunosorbent assay. Interaction of proteins was evaluated by immunoprecipitation. The HMGB1 level was significantly lower in human OA cartilage than in normal cartilage. Although 29-kDa FN-f significantly reduced the HMGB1 expression at the mRNA and protein levels 6 h after treatment, the cytoplasmic level of HMGB1 was increased in chondrocytes treated with 29-kDa FN-f, which significantly inhibited the interaction of HMGB1 with Beclin-1, increased the interaction of Bcl-2 with Beclin-1, and decreased the levels of Beclin-1 and phosphorylated Bcl-2. In addition, the level of microtubule-associated protein 1 light chain 3-II, an autophagy marker, was down-regulated in chondrocytes treated with 29-kDa FN-f, whereas the effect was antagonized by mTOR knockdown. Furthermore, prolonged treatment with 29-kDa FN-f significantly increased the release of HMGB1 into the culture medium. These results demonstrated that 29-kDa FN-f inhibits chondrocyte autophagy by modulating the HMGB1 signaling pathway. [BMB Reports 2018; 51(10): 509-514].
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Affiliation(s)
- Hyun Sook Hwang
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang 14068; Institute for Skeletal Aging, Hallym University, Chunchon 24251, Korea
| | - Min Ha Choi
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang 14068; Institute for Skeletal Aging, Hallym University, Chunchon 24251, Korea
| | - Hyun Ah Kim
- Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang 14068; Institute for Skeletal Aging, Hallym University, Chunchon 24251, Korea
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21
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Katsara O, Kolupaeva V. mTOR-mediated inactivation of 4E-BP1, an inhibitor of translation, precedes cartilage degeneration in rat osteoarthritic knees. J Orthop Res 2018; 36:2728-2735. [PMID: 29761560 DOI: 10.1002/jor.24049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 05/07/2018] [Indexed: 02/04/2023]
Abstract
Proper control of protein synthesis is vital for tissue homeostasis and its deregulation is characteristic of many disorders including osteoarthritis (OA). The objectives of this work were to analyze and correlate changes in activity of the translation apparatus associated with cartilage degeneration in an animal model of OA. Osteoarthritis was induced surgically in rats by anterior cruciate ligament transection (ACLT). Using a modified Mankin scoring system and analysis of protein expression we demonstrated, that mechanistic target of rapamycin complex 1 (mTORC1)-mediated 4E-BP1 phosphorylation was detected significantly earlier than other mTORC1-mediated modifications, such as p70S6K and ULK1 phosphorylation. 4E-BP1 is an inhibitor of cap-dependent translation those functions are inhibited by mTORC1 mediated phosphorylation. This signaling event not only preceded prominent signs of cartilage degeneration but also the increase in global protein synthesis rate. These results suggest that abnormal mTORC1 activity is one of the primary dysregulations observed in OA cartilage. Importantly, it is distributed disproportionately between targets, with 4E-BP1 being phosphorylated earlier than other downstream targets. Thus, our work provides new insights into the sequence of molecular events leading to cartilage destruction in OA and identifies translational control as an important regulatory hub involved in initiating OA. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:2728-2735, 2018.
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Affiliation(s)
- Olga Katsara
- Department of Microbiology, NYU Langone Health, NYU Langone Medical Center, 550 First Avenue, MSB258, New York, New York 10016
| | - Victoria Kolupaeva
- Department of Microbiology, NYU Langone Health, NYU Langone Medical Center, 550 First Avenue, MSB258, New York, New York 10016
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22
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Soul J, Dunn SL, Anand S, Serracino-Inglott F, Schwartz JM, Boot-Handford RP, Hardingham TE. Stratification of knee osteoarthritis: two major patient subgroups identified by genome-wide expression analysis of articular cartilage. Ann Rheum Dis 2017; 77:423. [PMID: 29273645 PMCID: PMC5867416 DOI: 10.1136/annrheumdis-2017-212603] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 11/21/2017] [Accepted: 11/28/2017] [Indexed: 12/13/2022]
Abstract
Introduction Osteoarthritis (OA) is a heterogeneous and complex disease. We have used a network biology approach based on genome-wide analysis of gene expression in OA knee cartilage to seek evidence for pathogenic mechanisms that may distinguish different patient subgroups. Methods Results from RNA-Sequencing (RNA-Seq) were collected from intact knee cartilage at total knee replacement from 44 patients with OA, from 16 additional patients with OA and 10 control patients with non-OA. Results were analysed to identify patient subsets and compare major active pathways. Results The RNA-Seq results showed 2692 differentially expressed genes between OA and non-OA. Analysis by unsupervised clustering identified two distinct OA groups: Group A with 24 patients (55%) and Group B with 18 patients (41%). A 10 gene subgroup classifier was validated by RT-qPCR in 16 further patients with OA. Pathway analysis showed increased protein expression in both groups. PhenomeExpress analysis revealed group differences in complement activation, innate immune responses and altered Wnt and TGFβ signalling, but no activation of inflammatory cytokine expression. Both groups showed suppressed circadian regulators and whereas matrix changes in Group A were chondrogenic, in Group B they were non-chondrogenic with changes in mechanoreceptors, calcium signalling, ion channels and in cytoskeletal organisers. The gene expression changes predicted 478 potential biomarkers for detection in synovial fluid to distinguish patients from the two groups. Conclusions Two subgroups of knee OA were identified by network analysis of RNA-Seq data with evidence for the presence of two major pathogenic pathways. This has potential importance as a new basis for the stratification of patients with OA for drug trials and for the development of new targeted treatments.
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Affiliation(s)
- Jamie Soul
- Wellcome Trust Centre for Cell-Matrix Research, Division of Cell-Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Sara L Dunn
- Wellcome Trust Centre for Cell-Matrix Research, Division of Cell-Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Sanjay Anand
- Department of Orthopaedic Surgery, Stockport NHS Foundation Trust, Stockport, UK
| | | | - Jean-Marc Schwartz
- Division of Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Ray P Boot-Handford
- Wellcome Trust Centre for Cell-Matrix Research, Division of Cell-Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Tim E Hardingham
- Wellcome Trust Centre for Cell-Matrix Research, Division of Cell-Matrix Biology and Regenerative Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
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