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Semevolos SA, Marchant EA. Comparison of differential protein expression of the marginal transitional zone in neonatal and weanling-aged foals. Tissue Cell 2024; 87:102295. [PMID: 38199048 DOI: 10.1016/j.tice.2023.102295] [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: 08/30/2023] [Revised: 12/12/2023] [Accepted: 12/27/2023] [Indexed: 01/12/2024]
Abstract
The marginal transitional zone (MTZ) is peripherally located within the diarthrodial joint, and represents the junction of synovium, fibrous joint capsule, articular cartilage, periosteum, and bone. The purpose of this study is to characterize age-related differences in protein expression of matrix and molecular regulators in the marginal transitional zone of neonatal and weanling foals. Several families of proteins with known roles in cartilage and bone development are investigated, including matrix molecules, members of the Wnt signaling family, apoptotic factors and paracrine cell signaling molecules. Our results demonstrate differential protein expression in the marginal transitional zone from the lateral femoral trochlear ridge of neonatal and weanling foals. Protein expression of several paracrine signaling molecules (Ihh, PTHrP, PDGF, VEGF, β-catenin, cytochrome C) within MTZ cartilage is higher in weanling-aged foals. Collagen type II and lubricin expression is similarly greater in weanling-aged foals, while matrix metalloproteinases are lower, likely reflecting the remodeling that occurs during cartilage development as increasing forces are placed on cartilage.
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Affiliation(s)
- Stacy A Semevolos
- Department of Clinical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA.
| | - Elizabeth A Marchant
- Department of Clinical Sciences, Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
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Dai GC, Wang H, Ming Z, Lu PP, Li YJ, Gao YC, Shi L, Cheng Z, Liu XY, Rui YF. Heterotopic mineralization (ossification or calcification) in aged musculoskeletal soft tissues: A new candidate marker for aging. Ageing Res Rev 2024; 95:102215. [PMID: 38325754 DOI: 10.1016/j.arr.2024.102215] [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: 11/19/2023] [Revised: 01/21/2024] [Accepted: 02/01/2024] [Indexed: 02/09/2024]
Abstract
Aging can lead to various disorders in organisms and with the escalating impact of population aging, the incidence of age-related diseases is steadily increasing. As a major risk factor for chronic illnesses in humans, the prevention and postponement of aging have become focal points of research among numerous scientists. Aging biomarkers, which mirror molecular alterations at diverse levels in organs, tissues, and cells, can be used to monitor and evaluate biological changes associated with aging. Currently, aging biomarkers are primarily categorized into physiological traits, imaging characteristics, histological features, cellular-level alterations, and molecular-level changes that encompass the secretion of aging-related factors. However, in the context of the musculoskeletal soft tissue system, aging-related biological indicators primarily involve microscopic parameters at the cellular and molecular levels, resulting in inconvenience and uncertainty in the assessment of musculoskeletal soft tissue aging. To identify convenient and effective indicators, we conducted a comprehensive literature review to investigate the correlation between ectopic mineralization and age-related changes in the musculoskeletal soft tissue system. Here, we introduce the concept of ectopic mineralization as a macroscopic, reliable, and convenient biomarker for musculoskeletal soft tissue aging and present novel targets and strategies for the future management of age-related musculoskeletal soft tissue disorders.
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Affiliation(s)
- Guang-Chun Dai
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Hao Wang
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Zhang Ming
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Pan-Pan Lu
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Ying-Juan Li
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Yu-Cheng Gao
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Liu Shi
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Zhang Cheng
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Xiao-Yu Liu
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China
| | - Yun-Feng Rui
- Department of Orthopaedics, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Orthopaedic Trauma Institute, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China; Trauma Center, Zhongda Hospital, School of Medicine, Southeast University, No. 87 Ding Jia Qiao, Nanjing, Jiangsu 210009, PR China.
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Kazemi M, Williams JL. Properties of Cartilage-Subchondral Bone Junctions: A Narrative Review with Specific Focus on the Growth Plate. Cartilage 2021; 13:16S-33S. [PMID: 32458695 PMCID: PMC8804776 DOI: 10.1177/1947603520924776] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE The purpose of this narrative review is to summarize what is currently known about the structural, chemical, and mechanical properties of cartilage-bone interfaces, which provide tissue integrity across a bimaterial interface of 2 very different structural materials. Maintaining these mechanical interfaces is a key factor for normal bone growth and articular cartilage function and maintenance. MATERIALS AND METHODS A comprehensive search was conducted using Google Scholar and PubMed/Medline with a specific focus on the growth plate cartilage-subchondral bone interface. All original articles, reviews in journals, and book chapters were considered. Following a review of the overall structural and functional characteristics of the physis, the literature on histological studies of both articular and growth plate chondro-osseous junctions is briefly reviewed. Next the literature on biochemical properties of these interfaces is reviewed, specifically the literature on elemental analyses across the cartilage-subchondral bone junctions. The literature on biomechanical studies of these junctions at the articular and physeal interfaces is also reviewed and compared. RESULTS Unlike the interface between articular cartilage and bone, growth plate cartilage has 2 chondro-osseous junctions. The reserve zone of the mature growth plate is intimately connected to a plate of subchondral bone on the epiphyseal side. This interface resembles that between the subchondral bone and articular cartilage, although much less is known about its makeup and formation. CONCLUSION There is a notably paucity of information available on the structural and mechanical properties of reserve zone-subchondral epiphyseal bone interface. This review reveals that further studies are needed on the microstructural and mechanical properties of chondro-osseous junction with the reserve zone.
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Affiliation(s)
- Masumeh Kazemi
- Biomedical Engineering Department,
University of Memphis, Memphis, TN, USA,Masumeh Kazemi, Biomedical Engineering
Department, University of Memphis, 3796 Norriswood Avenue, Memphis, TN 38152,
USA.
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Suthon S, Perkins RS, Bryja V, Miranda-Carboni GA, Krum SA. WNT5B in Physiology and Disease. Front Cell Dev Biol 2021; 9:667581. [PMID: 34017835 PMCID: PMC8129536 DOI: 10.3389/fcell.2021.667581] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Accepted: 04/09/2021] [Indexed: 12/20/2022] Open
Abstract
WNT5B, a member of the WNT family of proteins that is closely related to WNT5A, is required for cell migration, cell proliferation, or cell differentiation in many cell types. WNT5B signals through the non-canonical β-catenin-independent signaling pathway and often functions as an antagonist of canonical WNT signaling. Although WNT5B has a high amino acid identity with WNT5A and is often assumed to have similar activities, WNT5B often exhibits unique expression patterns and functions. Here, we describe the distinct effects and mechanisms of WNT5B on development, bone, adipose tissue, cardiac tissue, the nervous system, the mammary gland, the lung and hematopoietic cells, compared to WNT5A. We also highlight aberrances in non-canonical WNT5B signaling contributing to diseases such as osteoarthritis, osteoporosis, obesity, type 2 diabetes mellitus, neuropathology, and chronic diseases associated with aging, as well as various cancers.
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Affiliation(s)
- Sarocha Suthon
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Rachel S Perkins
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Vitezslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
- Department of Cytokinetics, Institute of Biophysics, Czech Academy of Sciences, Brno, Czechia
| | - Gustavo A Miranda-Carboni
- Division of Hematology and Oncology, Department of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
- Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Susan A Krum
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, TN, United States
- Center for Cancer Research, University of Tennessee Health Science Center, Memphis, TN, United States
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Yang Y, Xing D, Wang Y, Jia H, Li B, Li JJ. A long non-coding RNA, HOTAIR, promotes cartilage degradation in osteoarthritis by inhibiting WIF-1 expression and activating Wnt pathway. BMC Mol Cell Biol 2020; 21:53. [PMID: 32650720 PMCID: PMC7350747 DOI: 10.1186/s12860-020-00299-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 07/02/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Long noncoding RNAs (lncRNAs) are recently found to be critical regulators of the epigenome. However, our knowledge of their role in osteoarthritis (OA) development is limited. This study investigates the mechanism by which HOTAIR, a key lncRNA with elevated expression in OA, affects OA disease progression. RESULTS HOTAIR expression was greatly elevated in osteoarthritic compared to normal chondrocytes. Silencing and over-expression of HOTAIR in SW1353 cells respectively reduced and increased the expression of genes associated with cartilage degradation in OA. Investigation of molecular pathways revealed that HOTAIR acted directly on Wnt inhibitory factor 1 (WIF-1) by increasing histone H3K27 trimethylation in the WIF-1 promoter, leading to WIF-1 repression that favours activation of the Wnt/β-catenin pathway. CONCLUSIONS Activation of Wnt/β-catenin signalling by HOTAIR through WIF-1 repression in osteoarthritic chondrocytes increases catabolic gene expression and promotes cartilage degradation. This is the first study to demonstrate a direct link between HOTAIR, WIF-1 and OA progression, which may be useful for future investigations into disease biomarkers or therapeutic targets.
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Affiliation(s)
- Yang Yang
- Department of Orthopaedics, Tianjin Hospital, Tianjin, 300211, China
| | - Dan Xing
- Arthritis Clinic & Research Center, Peking University People's Hospital, Peking University, Beijing, 100044, China
| | - Yawei Wang
- Department of Electromyography, Tianjin Hospital, Tianjin, 300211, China
| | - Haobo Jia
- Department of Orthopaedics, Tianjin Hospital, Tianjin, 300211, China
| | - Bing Li
- Department of Orthopaedics, Tianjin Hospital, Tianjin, 300211, China
| | - Jiao Jiao Li
- Kolling Institute, Faculty of Medicine and Health, University of Sydney, St Leonards, NSW, 2065, Australia.
- School of Biomedical Engineering, Faculty of Engineering and IT, University of Technology Sydney (UTS), Ultimo, NSW, 2007, Australia.
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Vail DJ, Somoza RA, Caplan AI, Khalil AM. Transcriptome dynamics of long noncoding RNAs and transcription factors demarcate human neonatal, adult, and human mesenchymal stem cell-derived engineered cartilage. J Tissue Eng Regen Med 2019; 14:29-44. [PMID: 31503387 DOI: 10.1002/term.2961] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 08/02/2019] [Accepted: 09/03/2019] [Indexed: 11/08/2022]
Abstract
The engineering of a native-like articular cartilage (AC) is a long-standing objective that could serve the clinical needs of millions of patients suffering from osteoarthritis and cartilage injury. An incomplete understanding of the developmental stages of AC has contributed to limited success in this endeavor. Using next generation RNA sequencing, we have transcriptionally characterized two critical stages of AC development in humans-that is, immature neonatal and mature adult, as well as tissue-engineered cartilage derived from culture expanded human mesenchymal stem cells. We identified key transcription factors (TFs) and long noncoding RNAs (lncRNAs) as candidate drivers of the distinct phenotypes of these tissues. AGTR2, SCGB3A1, TFCP2L1, RORC, and TBX4 stand out as key TFs, whose expression may be capable of reprogramming engineered cartilage into a more expandable and neonatal-like cartilage primed for maturation into biomechanically competent cartilage. We also identified that the transcriptional profiles of many annotated but poorly studied lncRNAs were dramatically different between these cartilages, indicating that lncRNAs may also be playing significant roles in cartilage biology. Key neonatal-specific lncRNAs identified include AC092818.1, AC099560.1, and KC877982. Collectively, our results suggest that tissue-engineered cartilage can be optimized for future clinical applications by the specific expression of TFs and lncRNAs.
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Affiliation(s)
- Daniel J Vail
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH
| | - Rodrigo A Somoza
- Skeletal Research Center, Department of Biology, Case Western Reserve University, Cleveland, OH
| | - Arnold I Caplan
- Skeletal Research Center, Department of Biology, Case Western Reserve University, Cleveland, OH
| | - Ahmad M Khalil
- Department of Genetics and Genome Sciences, Case Western Reserve University School of Medicine, Cleveland, OH.,Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH
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Semevolos SA, Duesterdieck-Zellmer KF, Larson M, Kinsley MA. Expression of pro-apoptotic markers is increased along the osteochondral junction in naturally occurring osteochondrosis. Bone Rep 2018; 9:19-26. [PMID: 29998174 PMCID: PMC6038796 DOI: 10.1016/j.bonr.2018.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/29/2018] [Accepted: 06/15/2018] [Indexed: 11/28/2022] Open
Abstract
Osteochondrosis (OC) is a naturally occurring disease of the articular-epiphyseal cartilage and subchondral bone layers, leading to pain and decreased mobility. The objective of this study was to characterize gene and protein expression of apoptotic markers in chondrocytes surrounding cartilage canals and along the osteochondral junction of osteochondrosis (OC)-affected and normal cartilage, using naturally occurring disease in horses. Paraffin-embedded osteochondral samples (6 OC, 8 normal controls) and cDNA from chondrocytes captured with laser capture microdissection (4 OC, 6 normal controls) were obtained from the lateral trochlear ridge of femoropatellar joints in 14 immature horses (1–6 months of age). Equine-specific caspase-3, caspase-8, caspase-10, Fas, Bcl-2, BAG-1, TNFα, cytochrome C, thymosin-β10, and 18S mRNA expression levels were evaluated by two-step real-time quantitative PCR. Percentage of cell death was determined using the TUNEL method. Protein expression of caspase-10, Fas, cytochrome C, and thymosin-β10 was determined following immunohistochemistry. Statistical analysis was performed using the Wilcoxon rank sum test or two-sample t-test (p < 0.05). In OC samples, there was significantly increased gene expression of caspase-10, Fas, cytochrome C, and thymosin-β10 in chondrocytes along the osteochondral junction and increased Fas gene expression in chondrocytes adjacent to cartilage canals, compared to controls. In OC samples, higher matrix Fas and cytochrome C protein expression, lower mitochondrial cytochrome C protein expression, and a trend for higher cytoplasmic caspase-10 protein expression were found. Collectively, these results suggest that both extrinsic and intrinsic apoptotic pathways are activated in OC cartilage. Increased apoptosis of osteochondral junction chondrocytes may play a role in OC, based on increased gene expression of several pro-apoptotic markers in this location. Pro-apoptotic marker gene expression increased in osteochondrosis cartilage Extrinsic and intrinsic apoptotic pathways activated along osteochondral junction Higher caspase-10, Fas, cytochrome C, and thymosin-β10 gene expression
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Affiliation(s)
- Stacy A Semevolos
- Department of Clinical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
| | - Katja F Duesterdieck-Zellmer
- Department of Clinical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
| | - Maureen Larson
- Department of Clinical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
| | - Marc A Kinsley
- Department of Clinical Sciences, College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
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Verdelho Machado M, Diehl AM. The hedgehog pathway in nonalcoholic fatty liver disease. Crit Rev Biochem Mol Biol 2018; 53:264-278. [PMID: 29557675 DOI: 10.1080/10409238.2018.1448752] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) encompasses a spectrum of obesity-associated liver diseases and it has become the major cause of cirrhosis in the Western world. The high prevalence of NAFLD-associated advanced liver disease reflects both the high prevalence of obesity-related fatty liver (hepatic steatosis) and the lack of specific treatments to prevent hepatic steatosis from progressing to more serious forms of liver damage, including nonalcoholic steatohepatitis (NASH), cirrhosis, and primary liver cancer. The pathogenesis of NAFLD is complex, and not fully understood. However, compelling evidence demonstrates that dysregulation of the hedgehog (Hh) pathway is involved in both the pathogenesis of hepatic steatosis and the progression from hepatic steatosis to more serious forms of liver damage. Inhibiting hedgehog signaling enhances hepatic steatosis, a condition which seldom results in liver-related morbidity or mortality. In contrast, excessive Hh pathway activation promotes development of NASH, cirrhosis, and primary liver cancer, the major causes of liver-related deaths. Thus, suppressing excessive Hh pathway activity is a potential approach to prevent progressive liver damage in NAFLD. Various pharmacologic agents that inhibit Hh signaling are available and approved for cancer therapeutics; more are being developed to optimize the benefits and minimize the risks of inhibiting this pathway. In this review we will describe the Hh pathway, summarize the evidence for its role in NAFLD evolution, and discuss the potential role for Hh pathway inhibitors as therapies to prevent NASH, cirrhosis and liver cancer.
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Affiliation(s)
- Mariana Verdelho Machado
- a Division of Gastroenterology, Department of Medicine , Duke University Medical Center , Durham , NC , USA.,b Department of Gastroenterology , Hospital de Santa Maria, CHLN , Lisbon , Portugal
| | - Anna Mae Diehl
- a Division of Gastroenterology, Department of Medicine , Duke University Medical Center , Durham , NC , USA
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Correlation of dickkopf-1 concentrations in plasma and synovial fluid to the severity of radiographic signs of equine osteoarthritis. Vet Comp Orthop Traumatol 2017; 30:311-317. [PMID: 28763521 DOI: 10.3415/vcot-16-11-0157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 04/19/2017] [Indexed: 12/17/2022]
Abstract
OBJECTIVE The purpose of this study was to determine whether there was a correlation between circulating and intra-synovial Dkk-1 and radiographic signs of equine osteoarthritis. METHODS Circulating and intra-synovial Dkk-1 levels were measured in clinical cases using a commercially available human Dkk-1 ELISA. Radiographs were performed of the joints from which fluid was collected and these were assessed and scored by a boarded radiologist for joint narrowing, subchondral bone sclerosis, subchondral bone lysis, and periarticular modelling. Comparisons were made between radiographic scores and the concentrations of Dkk-1 using a Kruskal-Wallis one-way ANOVA. Correlations were calculated using Kendall's statistic. RESULTS A total of 42 synovial fluid samples from 21 horses were collected and used in the analysis. No significant correlation was identified between Dkk-1 concentrations and radiographic signs of osteoarthritis. Intra-synovial Dkk-1 concentrations were significantly greater (p <0.001) in low motion joints (mean concentration, 232.68 pg/mL; range, 109.07-317.17) when compared to high-motion joints (28.78 pg/mL; 0.05-186.44 pg/mL) (p <0.001). CLINICAL SIGNIFICANCE Low motion joints have significantly higher concentrations of Dkk-1 compared to high motion joints. Further research is needed to establish the importance of this finding and whether potential diagnostic or therapeutic applications of Dkk-1 exist in the horse.
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