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Luo S, Li W, Wu W, Shi Q. Elevated expression of MMP8 and MMP9 contributes to diabetic osteoarthritis progression in a rat model. J Orthop Surg Res 2021; 16:64. [PMID: 33468174 PMCID: PMC7814732 DOI: 10.1186/s13018-021-02208-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 01/05/2021] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Knowledge regarding the pathogenesis of osteoarthritis (OA) is very limited. Previous studies have shown that matrix metalloproteinase (MMP) 8 and MMP9 were upregulated in patients with diabetic OA. However, their regulatory functions and mechanisms in diabetic OA are not fully understood. METHODS Diabetic OA rats were constructed using a high-fat diet combined with streptozotocin (STZ) induction. Safranin O-Fast green staining was used to detect the pathological changes in rat knee cartilage. MMP8 and MMP9 overexpression vectors or siRNAs were injected into diabetic OA rats to overexpress or knockdown the expression of MMP8 and MMP9, which was verified by real-time quantitative PCR (RT-qPCR). The expression of MMP8 and MMP9, chondrocyte differentiation markers collagen type II alpha 1 (COL2A1) and collagen type I alpha 1(COL1A1), and antiapoptotic protein BCL2 were detected using immunohistochemistry (IHC), and the number of apoptotic cells was detected by the transferase-mediated d-UTP nick-end-labeling (TUNEL) assay. RESULTS High-fat diet combined with STZ-induced rats exhibited joint cartilage damage, morphological changes, and increased expression of MMP8 and MMP9. Overexpression of MMP8 and MMP9 in the joint cavity further aggravated the pathological morphological changes, decreased the expression of COL2A1 and COL1A1, increased the expression of BCL2, and promoted cell apoptosis in diabetic OA rats. The use of siRNA to inhibit MMP8 and MMP9 levels in the cartilage joints significantly reversed the decrease in COL2A1 and COL1A1 expression and partially reversed BCL2 expression and chondrocyte apoptosis. CONCLUSION MMP8 and MMP9 promoted rat diabetic OA model. The underlying mechanism may be related to inhibiting cartilage differentiation and promoting chondrocyte apoptosis.
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Affiliation(s)
- Simin Luo
- Department of Bone and Joint Surgery, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, China
| | - Wuji Li
- Department of Bone and Joint Surgery, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, China
| | - Wenrui Wu
- Department of Bone and Joint Surgery, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, China
| | - Qiping Shi
- Department of Endocrine, The First Affiliated Hospital, Jinan University, Guangzhou, 510632, China.
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Romero-Ortuno R, Kenny RA, McManus R. Collagens and elastin genetic variations and their potential role in aging-related diseases and longevity in humans. Exp Gerontol 2019; 129:110781. [PMID: 31740390 DOI: 10.1016/j.exger.2019.110781] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 11/11/2019] [Accepted: 11/12/2019] [Indexed: 12/17/2022]
Abstract
Collagens and elastin are 'building blocks' of tissues and extracellular matrix. Mutations in these proteins cause severe congenital syndromes. Adverse genetic variations may accelerate the aging process in adults contributing to premature morbidity, disability and/or mortality. Favorable variants may contribute to longevity and/or healthy aging, but this is much less studied. We reviewed the association between variation in the genes of collagens and elastin and premature aging, accelerated aging, age-related diseases and/or frailty; and the association between genetic variation in those and longevity and/or healthy aging in humans. A systematic search was conducted in MEDLINE and other online databases (OMIM, Genetics Home Reference, Orphanet, ClinVar). Results suggest that genetic variants lead to aging phenotypes of known congenital disease, but also to association with common age-related diseases in adults without known congenital disease. This may be due to the variable penetrance and expressivity of many variants. Some collagen variants have been associated with longevity or healthy aging. A limitation is that most studies had <1000 participants and their criterion for statistical significance was p < 0.05. Results highlight the importance of adopting a lifecourse approach to the study of the genomics of aging. Gerontology can help with new methodologies that operationalize biological aging.
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Affiliation(s)
- Roman Romero-Ortuno
- Trinity College Dublin, Discipline of Medical Gerontology, Mercer's Institute for Successful Ageing, St James's Hospital, Dublin 8, Ireland; The Irish Longitudinal Study on Ageing (TILDA), Trinity College Dublin, Dublin, Ireland..
| | - Rose Anne Kenny
- Trinity College Dublin, Discipline of Medical Gerontology, Mercer's Institute for Successful Ageing, St James's Hospital, Dublin 8, Ireland; The Irish Longitudinal Study on Ageing (TILDA), Trinity College Dublin, Dublin, Ireland
| | - Ross McManus
- Trinity College Dublin, Trinity Translational Medicine Institute, Trinity Centre for Health Sciences, St James's Hospital, Dublin 8, Ireland
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Fernández-Torres J, Martínez-Nava GA, Zamudio-Cuevas Y, Martínez-Flores K, Gutiérrez-Ruíz MC, Gómez-Quiroz LE, Garrido-Rodríguez D, Muñoz-Valle JF, Oregón-Romero E, Lozada C, Cornejo DC, Pineda C, López-Reyes A. Impact of the gene-gene interactions related to the HIF-1α signaling pathway with the knee osteoarthritis development. Clin Rheumatol 2019; 38:2897-2907. [PMID: 31236747 DOI: 10.1007/s10067-019-04635-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 05/03/2019] [Accepted: 06/04/2019] [Indexed: 12/20/2022]
Abstract
INTRODUCTION/OBJECTIVES Articular cartilage is the target tissue of osteoarthritis (OA), and because it lacks capillary networks, the microenvironment is hypoxic. Hypoxia inducible factor-1 alpha (HIF-1α) regulates the homeostasis of this tissue. The aim of this study was to investigate whether genetic polymorphisms of the HIF-1α signaling pathway are involved in the development of knee OA. METHOD We performed a case-control association study and genotyped 134 knee OA patients and 267 healthy controls. All participants were genotyped in order to evaluate 42 SNPs from 22 genes involved in the HIF-1α signaling pathway using the OpenArray technology. Gene-gene interactions (epistasis) were analyzed using the multifactor dimensionality reduction (MDR) method. RESULTS The MDR analysis showed epistasis between AKT2 (rs8100018) and IGF1 (rs2288377), AKT2 (rs8100018) and IGF1 (rs35767), IGF1 (rs35767) and COL2A1 (rs1793953), and between GSK3B (rs6438552) and IGF1 (rs35767) polymorphisms, with information gain values of 21.24%, 8.37%, 9.93%, and 5.73%, respectively. Additionally, our model allowed us to identify high- and low-risk genotypes among COL2A1 rs1793953, GSK3B rs6438552, AKT2 rs8100018, and IGF1 rs35767 polymorphisms. CONCLUSIONS Knowing the interactions of these polymorphisms involved in HIF-1α signaling pathway could provide a new diagnostic support tool to identify individuals at high risk of developing knee OA.
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Affiliation(s)
- Javier Fernández-Torres
- Synovial Fluid Laboratory, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico.,Biological and Health Sciences PhD Program, Universidad Autónoma Metropolitana Iztapalapa, Mexico City, Mexico
| | | | - Yessica Zamudio-Cuevas
- Synovial Fluid Laboratory, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico
| | - Karina Martínez-Flores
- Synovial Fluid Laboratory, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico
| | | | | | - Daniela Garrido-Rodríguez
- Center for Research in Infectious Diseases, National Institute of Respiratory Diseases, Mexico City, Mexico
| | - José Francisco Muñoz-Valle
- Departamento de Biología Molecular y Genómica, Instituto de Investigación en Ciencias Biomédicas (IICB), Universidad de Guadalajara, Guadalajara, Mexico
| | - Edith Oregón-Romero
- Departamento de Biología Molecular y Genómica, Instituto de Investigación en Ciencias Biomédicas (IICB), Universidad de Guadalajara, Guadalajara, Mexico
| | - Carlos Lozada
- Rheumatology Service, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico
| | - Denise Clavijo Cornejo
- Musculoskeletal and Rheumatic Diseases Division, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico
| | - Carlos Pineda
- Musculoskeletal and Rheumatic Diseases Division, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico
| | - Alberto López-Reyes
- Synovial Fluid Laboratory, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Mexico City, Mexico.
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González-Huerta NC, Borgonio-Cuadra VM, Morales-Hernández E, Duarte-Salazar C, Miranda-Duarte A. Vitamin D receptor gene polymorphisms and susceptibility for primary osteoarthritis of the knee in a Latin American population. Adv Rheumatol 2018; 58:6. [PMID: 30657057 DOI: 10.1186/s42358-018-0002-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 03/29/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Primary Osteoarthritis (OA) of the knee is a multifactorial disease that has an important genetic component, and several genes have been associated with its development. The vitamin D receptor has a role in skeletal metabolism that suggests a relationship with OA. The aim of this study was to analyze the association of Vitamin D receptor gene (VDR) polymorphisms in Mexican Mestizo patients. METHODS A case-control study was conducted in which 107 cases with primary OA of the knee and 114 controls were included. Cases were patients > 40 years of age with a Body mass index (BMI) of ≤27 and a radiological score for OA of the knee of ≥2. Controls were subjects > 40 years of age with a radiological score of < 2. VDR polymorphisms rs1544410, rs7975232, and rs731236 were analyzed by means of restriction endonucleases, and logistic regression was developed to evaluate risk magnitude. RESULTS A significantly increased risk was found of nearly two-fold for the allele T and TT genotypes of rs731236, independently of other well recognized risk factors. CONCLUSIONS The rs731236 polymorphism is associated with the risk of primary OA of the knee in Mexican Mestizo population.
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Affiliation(s)
- Norma Celia González-Huerta
- Departments of Genetics, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Calzada México-Xochimilco No. 289, Arenal Guadalupe, Tlalpan, CP 14389, México City, Mexico
| | - Verónica Marusa Borgonio-Cuadra
- Departments of Genetics, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Calzada México-Xochimilco No. 289, Arenal Guadalupe, Tlalpan, CP 14389, México City, Mexico
| | - Eugenio Morales-Hernández
- Departments of Radiology, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Calzada México-Xochimilco No. 289, Arenal Guadalupe, Tlalpan, CP 14389, México City, Mexico
| | - Carolina Duarte-Salazar
- Departments of Rheumatology, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Calzada México-Xochimilco No. 289, Arenal Guadalupe, Tlalpan, CP 14389, México City, Mexico
| | - Antonio Miranda-Duarte
- Departments of Genetics, Instituto Nacional de Rehabilitación "Luis Guillermo Ibarra Ibarra", Calzada México-Xochimilco No. 289, Arenal Guadalupe, Tlalpan, CP 14389, México City, Mexico.
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Association of COL1A1 rs1800012 polymorphism with musculoskeletal degenerative diseases: a meta-analysis. Oncotarget 2017; 8:75488-75499. [PMID: 29088884 PMCID: PMC5650439 DOI: 10.18632/oncotarget.20797] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 08/23/2017] [Indexed: 12/22/2022] Open
Abstract
It has been reported that the single nucleotide polymorphism (SNP) rs1800012 in COL1A1 gene might be linked to the susceptibility of musculoskeletal degenerative diseases, such as osteoarthritis (OA) and intervertebral disc degeneration (IVDD). However, the data from different studies is contradictory. Here we aimed to comprehensively summarize and clarify the relationship between the SNP and musculoskeletal degenerative diseases. Seven eligible studies including 1339 cases and 5406 controls were screened out from PubMed, Web Of Science and Cochrane library databases. Significant association was identified in sub group analysis of IVDD in homozygote model (GG versus TT: OR = 0.33, 95% CI 0.14–0.78, P = 0.012), heterozygote model (GT versus TT: OR = 0.29, 95% CI 0.11–0.72, P = 0.008) and dominant model (GG/GT versus TT: OR = 0.31, 95% CI 0.13–0.74, P = 0.008). Additionally, significant relationship was also found in sub group analysis of severe degree of IVDD in homozygote model (GG versus TT: OR = 0.37, 95% CI 0.15–0.91, P = 0.031), heterozygote model (GT versus TT: OR = 0.33, 95% CI 0.13–0.87,P = 0.024) and dominant model (GG/GT versus TT: OR = 0.36, 95% CI 0.14–0.88, P = 0.025). Although no significance was observed, there is a trend that the more G allele at COL1A1 rs1800012 site, the less possibility of IVDD and severe IVDD would happen. Our results indicate that COL1A1 rs1800012 polymorphism associates with the susceptibility of IVDD. However, this polymorphism may not be associated with OA risk.
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MMP-3 gene polymorphisms are associated with increased risk of osteoarthritis in Chinese men. Oncotarget 2017; 8:79491-79497. [PMID: 29108328 PMCID: PMC5668061 DOI: 10.18632/oncotarget.18493] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 04/26/2017] [Indexed: 01/30/2023] Open
Abstract
Osteoarthritis (OA) is the most common late-onset degenerative joint disease., It is characterized by progressive degradation of articular cartilage. We investigated the association between OA occurrence and single nucleotide polymorphisms (SNPs) in the matrix metalloproteinase-3 (MMP-3) gene involved in the breakdown of extra-cellular matrix proteins. The study included 100 male OA patients and 197 healthy men from the north area of China. Eight MMP-3 SNPs were genotyped. Odds ratios (ORs) with 95% confidence intervals (95%CIs) and multivariate logistic regression analysis were used to assess the association. Multivariate logistic regression analysis was used to identify SNPs that correlated with OA susceptibility. We found that rs639752 (dominant, OR = 2.03, 95% CI: 1.03-4.01, P = 0.038; over-dominant, OR = 2.00, 95% CI: 1.03-3.88, P = 0.037); rs520540 (dominant, OR = 2.03, 95% CI: 1.03-4.01, P = 0.038; over-dominant, OR = 2.00, 95% CI: 1.03-3.88, P = 0.037); rs602128 (dominant, OR = 2.03, 95% CI: 1.03-4.01, P = 0.038; over-dominant, OR = 2.01, 95% CI: 1.03-3.89, P = 0.037); and rs679620 (dominant, OR = 2.03, 95% CI: 1.03-4.01, P = 0.038; over-dominant, OR = 2.04, 95% CI: 1.05-3.96, P = 0.033) were associated with the increased risk of OA. Our results suggest that these SNPs may contribute to OA development, and could serve as molecular markers of OA susceptibility.
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Wang Y, Chu M, Rong J, Xing B, Zhu L, Zhao Y, Zhuang X, Jiang L. No association of the single nucleotide polymorphism rs8044769 in the fat mass and obesity-associated gene with knee osteoarthritis risk and body mass index: A population-based study in China. Bone Joint Res 2016; 5:169-74. [PMID: 27166265 PMCID: PMC4921048 DOI: 10.1302/2046-3758.55.2000589] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 03/01/2016] [Indexed: 01/26/2023] Open
Abstract
OBJECTIVES Previous genome-wide association studies (GWAS) have reported significant association of the single nucleotide polymorphism (SNP) rs8044769 in the fat mass and obesity-associated gene (FTO) with osteoarthritis (OA) risk in European populations. However, these findings have not been confirmed in Chinese populations. METHODS We systematically genotyped rs8044769 and evaluated the association between the genetic variants and OA risk in a case-controlled study including 196 OA cases and 442 controls in a northern Chinese population. Genotyping was performed using the Sequenom MassARRAY iPLEX platform. RESULTS We found that the variant T allele of rs8044769 showed no significant association of OA risk (p = 0.791), or association with body mass index (BMI) (pmeta = 0.786) in an additive genetic model. However, we detected a significant interaction between rs8044769 genotypes and BMI on OA risk (p = 0.037), as well as a borderline interaction between rs8044769 genotypes and age on OA risk (p = 0.062). CONCLUSIONS Our findings indicate that rs8044769 in the FTO gene may not modify individual susceptibility to OA or increased BMI in the Chinese population. Further studies are warranted to validate and extend our findings.Cite this article: Prof L. Jiang. No association of the single nucleotide polymorphism rs8044769 in the fat mass and obesity-associated gene with knee osteoarthritis risk and body mass index: A population-based study in China. Bone Joint Res 2016;5:169-174. DOI: 10.1302/2046-3758.55.2000589.
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Affiliation(s)
- Y Wang
- Department of Epidemiology, Nantong University, School of Public Health, Nantong, Jiangsu Province, China
| | - M Chu
- Department of Epidemiology, Nantong University, School of Public Health, Nantong, Jiangsu Province, China
| | - J Rong
- Department of Orthopedic Surgery, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - B Xing
- Hongqi Community Health Service Center, Xiangfang District, Harbin, Heilongjiang Province, China
| | - L Zhu
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Y Zhao
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - X Zhuang
- Department of Epidemiology, Nantong University, School of Public Health, Nantong, Jiangsu Province, China
| | - L Jiang
- Department of Epidemiology, Nantong University, School of Public Health, Nantong, Jiangsu Province, China
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Ren Y, Tan B, Yan P, You Y, Wu Y, Wang Y. Association between polymorphisms in the estrogen receptor alpha gene and osteoarthritis susceptibility: a meta-analysis. BMC Musculoskelet Disord 2015; 16:44. [PMID: 25887457 PMCID: PMC4345010 DOI: 10.1186/s12891-015-0506-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 02/19/2015] [Indexed: 12/30/2022] Open
Abstract
Background Osteoarthritis (OA) is a common chronic disease of the joints. Genetic factors may play a role in its development, and polymorphisms in the estrogen receptor alpha gene (ERα) have been associated with OA. However, previous studies into this relationship have reported inconsistent results, so we aimed to systematically review the association between ERα polymorphisms and OA susceptibility. Methods We conducted a comprehensive literature search of Ovid MEDLINE, EMBASE, CBM, and PubMed databases, and Google scholar, and identified 11 eligible studies that examined the association between ERα polymorphisms and OA susceptibility. We carried out a meta-analysis of these studies based on ERα XbaI (rs9340799) and PvuII (rs2234693) genotypes. Results Seventeen comparisons involving 10 European and seven Asian populations of 5,325 OA patients and 10,834 controls were included in the study. The ERα XbaI polymorphism were significantly associated with OA in Europeans (AA vs. AG + GG: OR = 1.17, 95% confidence interval (CI) = 1.02–1.34, P = 0.03; AG vs. AA + GG: OR = 0.86, 95% CI = 0.75–0.99, P = 0.04) but not in Asian populations. No association was found between OA and the ERα PvuII polymorphism in any population (C vs. T, OR = 0.98, 95% CI = 0.93–1.03, P = 0.37; CC vs. TT + CT, OR = 0.97, 95% CI = 0.89–1.06, P = 0.55; CT vs. CC + TT, OR = 0.99, 95% CI = 0.92–1.06, P = 0.75; TT vs. CC + CT, OR = 1.01, 95% CI =0.92–1.12, P = 0.79). Conclusions This study suggested that there may be a weak relationship between the ERα XbaI polymorphism and OA in Europeans but not Asians, and that the ERα PvuII polymorphism was not associated with OA in either population. However, large well-designed studies are necessary to confirm these results in more homogeneous populations.
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Affiliation(s)
- Yan Ren
- Department of Epidemiology and Biostatistics, West China School of Public Health, Sichuan University, Chengdu, 610041, People's Republic of China.
| | - Bo Tan
- Department of Orthopedics, Sichuan Academy of Medical Sciences, Sichuan Provincial People's Hospital, Chengdu, 610072, People's Republic of China.
| | - Peijing Yan
- Department of Epidemiology and Biostatistics, West China School of Public Health, Sichuan University, Chengdu, 610041, People's Republic of China.
| | - Yi You
- Department of Preventive Health Care, The People's Hospital of Dazu District, Chongqing, 402360, People's Republic of China.
| | - Yanqiao Wu
- Department of Epidemiology and Biostatistics, West China School of Public Health, Sichuan University, Chengdu, 610041, People's Republic of China. .,Department of Medical Record Management, West China Second University Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.
| | - Yue Wang
- Department of Orthopedics, Sichuan Academy of Medical Sciences, Sichuan Provincial People's Hospital, Chengdu, 610072, People's Republic of China.
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Highly accurate two-gene signature for gastric cancer. Med Oncol 2013; 30:584. [DOI: 10.1007/s12032-013-0584-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 04/11/2013] [Indexed: 12/12/2022]
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Current world literature. Curr Opin Rheumatol 2011; 23:497-503. [PMID: 21844756 DOI: 10.1097/bor.0b013e32834a96c0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Abstract
Osteoarthritis (OA) is the most common cause of arthritis and represents an enormous healthcare burden in industrialized societies. Current therapeutic approaches for OA are limited and are insufficient to prevent the initiation and progression of the disease. Genetic studies of patients with OA can help to unravel the molecular mechanisms responsible for specific disease manifestations, including joint damage, nociception and chronic pain. Indeed, these studies have identified molecules, such as growth/differentiation factor 5, involved in signaling cascades that are important for the pathology of joint components. Genome-wide association studies have uncovered a likely role in OA for the genes encoding structural extracellular matrix components (such as DVWA) and molecules involved in prostaglandin metabolism (such as DQB1 and BTNL2). A ∼300 kilobase region in chromosome 7q22 is also associated with OA susceptibility. Finally, the identification of individuals at a high risk of OA and of total joint arthroplasty failure might be facilitated by the use of combinations of genetic markers, allowing for the application of preventive and disease-management strategies.
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