1
|
Vonk AC, Zhao X, Pan Z, Hudnall ML, Oakes CG, Lopez GA, Hasel-Kolossa SC, Kuncz AWC, Sengelmann SB, Gamble DJ, Lozito TP. Single-cell analysis of lizard blastema fibroblasts reveals phagocyte-dependent activation of Hedgehog-responsive chondrogenesis. Nat Commun 2023; 14:4489. [PMID: 37563130 PMCID: PMC10415409 DOI: 10.1038/s41467-023-40206-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 07/18/2023] [Indexed: 08/12/2023] Open
Abstract
Lizards cannot naturally regenerate limbs but are the closest known relatives of mammals capable of epimorphic tail regrowth. However, the mechanisms regulating lizard blastema formation and chondrogenesis remain unclear. Here, single-cell RNA sequencing analysis of regenerating lizard tails identifies fibroblast and phagocyte populations linked to cartilage formation. Pseudotime trajectory analyses suggest spp1+-activated fibroblasts as blastema cell sources, with subsets exhibiting sulf1 expression and chondrogenic potential. Tail blastema, but not limb, fibroblasts express sulf1 and form cartilage under Hedgehog signaling regulation. Depletion of phagocytes inhibits blastema formation, but treatment with pericytic phagocyte-conditioned media rescues blastema chondrogenesis and cartilage formation in amputated limbs. The results indicate a hierarchy of phagocyte-induced fibroblast gene activations during lizard blastema formation, culminating in sulf1+ pro-chondrogenic populations singularly responsive to Hedgehog signaling. These properties distinguish lizard blastema cells from homeostatic and injury-stimulated fibroblasts and indicate potential actionable targets for inducing regeneration in other species, including humans.
Collapse
Affiliation(s)
- Ariel C Vonk
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Xiaofan Zhao
- Molecular Genomics Core, USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, 1441 Eastlake Ave, Los Angeles, CA, 90033, USA
| | - Zheyu Pan
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Megan L Hudnall
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Conrad G Oakes
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Gabriela A Lopez
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA
| | - Sarah C Hasel-Kolossa
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA
| | - Alexander W C Kuncz
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Sasha B Sengelmann
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Darian J Gamble
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA
| | - Thomas P Lozito
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California, 1425 San Pablo St, Los Angeles, CA, 90033, USA.
- Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, 1540 Alcazar St, Los Angeles, CA, 90033, USA.
| |
Collapse
|
2
|
Osteopontin: A Bone-Derived Protein Involved in Rheumatoid Arthritis and Osteoarthritis Immunopathology. Biomolecules 2023; 13:biom13030502. [PMID: 36979437 PMCID: PMC10046882 DOI: 10.3390/biom13030502] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/24/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
Osteopontin (OPN) is a bone-derived phosphoglycoprotein related to physiological and pathological mechanisms that nowadays has gained relevance due to its role in the immune system response to chronic degenerative diseases, including rheumatoid arthritis (RA) and osteoarthritis (OA). OPN is an extracellular matrix (ECM) glycoprotein that plays a critical role in bone remodeling. Therefore, it is an effector molecule that promotes joint and cartilage destruction observed in clinical studies, in vitro assays, and animal models of RA and OA. Since OPN undergoes multiple modifications, including posttranslational changes, proteolytic cleavage, and binding to a wide range of receptors, the mechanisms by which it produces its effects, in some cases, remain unclear. Although there is strong evidence that OPN contributes significantly to the immunopathology of RA and OA when considering it as a common denominator molecule, some experimental trial results argue for its protective role in rheumatic diseases. Elucidating in detail OPN involvement in bone and cartilage degeneration is of interest to the field of rheumatology. This review aims to provide evidence of the OPN’s multifaceted role in promoting joint and cartilage destruction and propose it as a common denominator of AR and OA immunopathology.
Collapse
|
3
|
Bai RJ, Liu D, Li YS, Tian J, Yu DJ, Li HZ, Zhang FJ. OPN inhibits autophagy through CD44, integrin and the MAPK pathway in osteoarthritic chondrocytes. Front Endocrinol (Lausanne) 2022; 13:919366. [PMID: 36034459 PMCID: PMC9411521 DOI: 10.3389/fendo.2022.919366] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 07/11/2022] [Indexed: 11/13/2022] Open
Abstract
Background To investigate whether osteopontin (OPN) affects autophagy in human osteoarthritic chondrocytes and determine the roles of CD44, αvβ3 integrin and the Mitogen-activated protein kinase (MAPK) pathway in this progress. Methods First, we compared the autophagy levels in the human osteoarthritis (OA) and normal cartilage, then, we cultured human OA chondrocytes in vitro and treated cells with recombinant human OPN (rhOPN) to determine autophagy changes. Next, the anti-CD44 and anti-CD51/61 monoclonal antibodies (Abs) or isotype IgG were used to determine the possible role of CD44 and αvβ3 integrin; subsequently, an inhibitor of the ERK MAPK pathway was used to investigate the role of ERK MAPK. Western blotting was used to measure the Beclin1, LC3 II and MAPK proteins expressions, mRFP-GFP-LC3 confocal imaging and transmission electron microscopy were also used to detect the autophagy levels. Cell Counting Kit-8 (CCK-8) was used to assay the proliferation and activity of chondrocytes. Results The LC3 protein was greatly decreased in OA cartilage compared to normal cartilage, and OPN suppressed the autophagy activity in chondrocytes in vitro. Blocking experiments with anti-CD44 and anti-CD51/61 Abs indicated that OPN could suppress the expression of LC3II and Beclin1 through αvβ3 integrin and CD44. Our results also indicated that the ratio of p-ERK/ERK but not p-P38/P38 and p-JNK/JNK was increased after the rhOPN treatment. The ERK inhibitor inhibited the activity of OPN in the suppression of autophagy, and the CCK-8 results showed that rhOPN could promote chondrocyte proliferation. Conclusion OPN inhibited chondrocyte autophagy through CD44 and αvβ3 integrin receptors and via the ERK MAPK signaling pathway.
Collapse
Affiliation(s)
- Rui-Jun Bai
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Di Liu
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Yu-Sheng Li
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Jian Tian
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Deng-Jie Yu
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Heng-Zhen Li
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, China
| | - Fang-Jie Zhang
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- Department of Emergency Medicine, Xiangya Hospital, Central South University, Changsha, China
| |
Collapse
|
4
|
Maggi J, Carrascal M, Soto L, Neira O, Cuéllar MC, Aravena O, James EA, Abian J, Jaraquemada D, Catalan D, Aguillón JC. Isolation of HLA-DR-naturally presented peptides identifies T-cell epitopes for rheumatoid arthritis. Ann Rheum Dis 2022; 81:1096-1105. [PMID: 35459695 DOI: 10.1136/annrheumdis-2021-220371] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 04/08/2022] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Rheumatoid arthritis (RA) immunopathogenesis revolves around the presentation of poorly characterised self-peptides by human leucocyte antigen (HLA)-class II molecules on the surface of antigen-presenting cells to autoreactive CD4 +T cells. Here, we analysed the HLA-DR-associated peptidome of synovial tissue (ST) and of dendritic cells (DCs) pulsed with synovial fluid (SF) or ST, to identify potential T-cell epitopes for RA. METHODS HLA-DR/peptide complexes were isolated from RA ST samples (n=3) and monocyte-derived DCs, generated from healthy donors carrying RA-associated shared epitope positive HLA-DR molecules and pulsed with RA SF (n=7) or ST (n=2). Peptide sequencing was performed by high-resolution mass spectrometry. The immunostimulatory capacity of selected peptides was evaluated on peripheral blood mononuclear cells from patients with RA (n=29) and healthy subjects (n=12) by flow cytometry. RESULTS We identified between 103 and 888 HLA-DR-naturally presented peptides per sample. We selected 37 native and six citrullinated (cit)-peptides for stimulation assays. Six of these peptides increased the expression of CD40L on CD4 +T cells patients with RA, and specifically triggered IFN-γ expression on RA CD4 +T cells compared with healthy subjects. Finally, the frequency of IFN-γ-producing CD4 +T cells specific for a myeloperoxidase-derived peptide showed a positive correlation with disease activity. CONCLUSIONS We significantly expanded the peptide repertoire presented by HLA-DR molecules in a physiologically relevant context, identifying six new epitopes recognised by CD4 +T cells from patients with RA. This information is important for a better understanding of the disease immunopathology, as well as for designing tolerising antigen-specific immunotherapies.
Collapse
Affiliation(s)
- Jaxaira Maggi
- Immune Regulation and Tolerance Research Group, Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Universidad de Chile Facultad de Medicina, Santiago, Chile
| | - Montserrat Carrascal
- Biological and Environmental Proteomics Group, IIBB-CSIC, IDIBAPS, Barcelona, Spain
| | - Lilian Soto
- Immune Regulation and Tolerance Research Group, Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Universidad de Chile Facultad de Medicina, Santiago, Chile
- Departamento de Medicina, Unidad del Dolor, Hospital Clinico de la Universidad de Chile Jose Joaquin Aguirre, Santiago, Chile
| | - Oscar Neira
- Servicio de Reumatología, Hospital del Salvador, Universidad de Chile, Santiago, Chile
| | - María C Cuéllar
- Servicio de Reumatología, Hospital del Salvador, Universidad de Chile, Santiago, Chile
| | - Octavio Aravena
- Immune Regulation and Tolerance Research Group, Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Universidad de Chile Facultad de Medicina, Santiago, Chile
| | - Eddie A James
- Translational Research Program, Benaroya Research Institute, Seattle, Washington, USA
| | - Joaquin Abian
- Biological and Environmental Proteomics Group, IIBB-CSIC, IDIBAPS, Barcelona, Spain
| | - Dolores Jaraquemada
- Immunology Unit, Cell Biology, Physiology and Immunology Department, Institut de Biotecnologia i Biomedicina, Universitat de Barcelona, Barcelona, Spain
| | - Diego Catalan
- Immune Regulation and Tolerance Research Group, Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Universidad de Chile Facultad de Medicina, Santiago, Chile
| | - Juan C Aguillón
- Immune Regulation and Tolerance Research Group, Programa Disciplinario de Inmunología, Instituto de Ciencias Biomédicas (ICBM), Universidad de Chile Facultad de Medicina, Santiago, Chile
| |
Collapse
|
5
|
Xie JF, Wang J, Bai HH, He JJ, Jia RH, Wang X, Zhang WQ, Zhao XC, Zhang XC, Liu GY, Li XF. A Decreased Absolute Number of T reg Cells in Patients with Active Rheumatoid Arthritis is Associated with Elevated Serum Osteopontin Levels with Disease Progression. Adv Ther 2022; 39:3280-3291. [PMID: 35604524 DOI: 10.1007/s12325-022-02171-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 04/22/2022] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Rheumatoid arthritis (RA) is a chronic and refractory autoimmune disease characterized by synovial inflammation with unknown aetiology. Immune system dysfunction mediated by CD4+ T lymphocytes, which is regulated by the cytokine osteopontin (OPN), plays an important role in the pathogenesis of RA. METHODS In this study, the levels of peripheral CD4+ T subsets and serum OPN in patients with active RA were measured and analysed to determine the possible pathogenesis of RA and to provide potential therapeutic targets. RESULTS Serum OPN levels in both patients with active RA and patients with refractory RA were higher than those in healthy controls (HCs). Compared with HCs, the absolute numbers of Th2 cells increased in patients with active RA, while the absolute counts of Th1 and Treg cells decreased. There was no significant difference in CD4+ T subset levels between new-onset and refractory patients. As the condition persisted or deteriorated, a gradual increase in the levels of OPN and gradual declines in the absolute counts of Th1 and Treg cells were observed in patients with active RA. The fewest Th1 and Treg cells and the highest OPN levels were observed in patients with high disease activity. The serum OPN level was only significantly negatively correlated with the absolute counts of Treg cells in the CD4+ T lymphocyte subsets. CONCLUSIONS Fewer Treg cells with the increase in disease activity may be related to the increased OPN concentration, which may provide new ideas and directions for the targeted immunoregulatory treatment of RA.
Collapse
Affiliation(s)
- Jian-Fang Xie
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Jia Wang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Huan-Huan Bai
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Jiao-Jiao He
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Rui-Huan Jia
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xia Wang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Wen-Qi Zhang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xiang-Cong Zhao
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xian-Cheng Zhang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Guang-Ying Liu
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China
| | - Xiao-Feng Li
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, 030001, Shanxi, China.
| |
Collapse
|
6
|
Xu C, Wu Y, Liu N. Osteopontin in autoimmune disorders: current knowledge and future perspective. Inflammopharmacology 2022; 30:385-396. [PMID: 35235108 DOI: 10.1007/s10787-022-00932-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/03/2022] [Indexed: 11/30/2022]
Abstract
Osteopontin (OPN) is a multifunctional cytokine and adhesion molecule, as well as an unusual regulator for both innate and adaptive immune responses. Several immune cells can produce OPN, including dendritic cells (DCs), macrophages, and T lymphocytes. OPN expression is reported to be increased in a wide range of disorders, including autoimmunity, cancer, and allergy. The overexpression of OPN in several autoimmune disorders, such as rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), multiple sclerosis (MS), Type 1 diabetes (T1D), inflammatory bowel disease (IBD), Sjögren's, and myasthenia gravis, have been shown to be correlated with disease severity. Regarding the important regulatory roles of OPN in the immune system, this study aimed to review the role of this molecule in autoimmune disorders and to provide a complete view of the current knowledge in this field.
Collapse
Affiliation(s)
- Canhua Xu
- Department of Spine Surgery, Ganzhou People's Hospital, No. 16, Meiguan Avenue, Zhanggong District, Ganzhou, 341000, Jiangxi, China
| | - Yaohong Wu
- Department of Spine Surgery, Ganzhou People's Hospital, No. 16, Meiguan Avenue, Zhanggong District, Ganzhou, 341000, Jiangxi, China
| | - Ning Liu
- Department of Spine Surgery, Ganzhou People's Hospital, No. 16, Meiguan Avenue, Zhanggong District, Ganzhou, 341000, Jiangxi, China.
| |
Collapse
|
7
|
Danger signal extracellular calcium initiates differentiation of monocytes into SPP1/osteopontin-producing macrophages. Cell Death Dis 2022; 13:53. [PMID: 35022393 PMCID: PMC8755842 DOI: 10.1038/s41419-022-04507-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 12/08/2021] [Accepted: 01/04/2022] [Indexed: 12/18/2022]
Abstract
The danger signal extracellular calcium is pathophysiologically increased in the synovial fluid of patients with rheumatoid arthritis (RA). Calcium activates the NLRP3-inflammasome via the calcium-sensing receptor in monocytes/macrophages primed by lipopolysaccharide, and this effect is mediated by the uptake of calciprotein particles (CPPs) formed out of calcium, phosphate, and fetuin-A. Aim of the study was to unravel the influence of calcium on monocytes when the priming signal is not present. Monocytes were isolated from the blood of healthy controls and RA patients. Macrophages were characterized using scRNA-seq, DNA microarray, and proteomics. Imaging flow cytometry was utilized to study intracellular events. Here we show that extracellular calcium and CPPs lead to the differentiation of monocytes into calcium-macrophages when the priming signal is absent. Additional growth factors are not needed, and differentiation is triggered by calcium-dependent CPP-uptake, lysosomal alkalization due to CPP overload, and TFEB- and STAT3-dependent increased transcription of the lysosomal gene network. Calcium-macrophages have a needle-like shape, are characterized by excessive, constitutive SPP1/osteopontin production and a strong pro-inflammatory cytokine response. Calcium-macrophages differentiated out of RA monocytes show a stronger manifestation of this phenotype, suggesting the differentiation process might lead to the pro-inflammatory macrophage response seen in the RA synovial membrane.
Collapse
|
8
|
Wang C, Ying J, Nie X, Zhou T, Xiao D, Swarnkar G, Abu-Amer Y, Guan J, Shen J. Targeting angiogenesis for fracture nonunion treatment in inflammatory disease. Bone Res 2021; 9:29. [PMID: 34099632 PMCID: PMC8184936 DOI: 10.1038/s41413-021-00150-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 01/20/2021] [Accepted: 02/01/2021] [Indexed: 02/05/2023] Open
Abstract
Atrophic fracture nonunion poses a significant clinical problem with limited therapeutic interventions. In this study, we developed a unique nonunion model with high clinical relevance using serum transfer-induced rheumatoid arthritis (RA). Arthritic mice displayed fracture nonunion with the absence of fracture callus, diminished angiogenesis and fibrotic scar tissue formation leading to the failure of biomechanical properties, representing the major manifestations of atrophic nonunion in the clinic. Mechanistically, we demonstrated that the angiogenesis defect observed in RA mice was due to the downregulation of SPP1 and CXCL12 in chondrocytes, as evidenced by the restoration of angiogenesis upon SPP1 and CXCL12 treatment in vitro. In this regard, we developed a biodegradable scaffold loaded with SPP1 and CXCL12, which displayed a beneficial effect on angiogenesis and fracture repair in mice despite the presence of inflammation. Hence, these findings strongly suggest that the sustained release of SPP1 and CXCL12 represents an effective therapeutic approach to treat impaired angiogenesis and fracture nonunion under inflammatory conditions.
Collapse
Affiliation(s)
- Cuicui Wang
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA
| | - Jun Ying
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA ,grid.417400.60000 0004 1799 0055Department of Orthopaedic Surgery, the First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China ,grid.417400.60000 0004 1799 0055Institute of Orthopaedics and Traumatology, the First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Xiaolei Nie
- grid.4367.60000 0001 2355 7002Department of Mechanical Engineering & Materials Science, School of Engineering, Washington University, St. Louis, MO USA
| | - Tianhong Zhou
- grid.4367.60000 0001 2355 7002Department of Mechanical Engineering & Materials Science, School of Engineering, Washington University, St. Louis, MO USA
| | - Ding Xiao
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA
| | - Gaurav Swarnkar
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA
| | - Yousef Abu-Amer
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA ,grid.415840.c0000 0004 0449 6533Shriners Hospital for Children, St. Louis, MO USA
| | - Jianjun Guan
- grid.4367.60000 0001 2355 7002Department of Mechanical Engineering & Materials Science, School of Engineering, Washington University, St. Louis, MO USA
| | - Jie Shen
- grid.4367.60000 0001 2355 7002Department of Orthopaedic Surgery, School of Medicine, Washington University, St. Louis, MO USA
| |
Collapse
|
9
|
McGrowder DA, Miller F, Vaz K, Nwokocha C, Wilson-Clarke C, Anderson-Cross M, Brown J, Anderson-Jackson L, Williams L, Latore L, Thompson R, Alexander-Lindo R. Cerebrospinal Fluid Biomarkers of Alzheimer's Disease: Current Evidence and Future Perspectives. Brain Sci 2021; 11:215. [PMID: 33578866 PMCID: PMC7916561 DOI: 10.3390/brainsci11020215] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 02/07/2023] Open
Abstract
Alzheimer's disease is a progressive, clinically heterogeneous, and particularly complex neurodegenerative disease characterized by a decline in cognition. Over the last two decades, there has been significant growth in the investigation of cerebrospinal fluid (CSF) biomarkers for Alzheimer's disease. This review presents current evidence from many clinical neurochemical studies, with findings that attest to the efficacy of existing core CSF biomarkers such as total tau, phosphorylated tau, and amyloid-β (Aβ42), which diagnose Alzheimer's disease in the early and dementia stages of the disorder. The heterogeneity of the pathophysiology of the late-onset disease warrants the growth of the Alzheimer's disease CSF biomarker toolbox; more biomarkers showing other aspects of the disease mechanism are needed. This review focuses on new biomarkers that track Alzheimer's disease pathology, such as those that assess neuronal injury (VILIP-1 and neurofilament light), neuroinflammation (sTREM2, YKL-40, osteopontin, GFAP, progranulin, and MCP-1), synaptic dysfunction (SNAP-25 and GAP-43), vascular dysregulation (hFABP), as well as CSF α-synuclein levels and TDP-43 pathology. Some of these biomarkers are promising candidates as they are specific and predict future rates of cognitive decline. Findings from the combinations of subclasses of new Alzheimer's disease biomarkers that improve their diagnostic efficacy in detecting associated pathological changes are also presented.
Collapse
Affiliation(s)
- Donovan A. McGrowder
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Fabian Miller
- Department of Physical Education, Faculty of Education, The Mico University College, 1A Marescaux Road, Kingston 5, Jamaica;
- Department of Biotechnology, Faculty of Science and Technology, The University of the West Indies, Kingston 7, Jamaica;
| | - Kurt Vaz
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Chukwuemeka Nwokocha
- Department of Basic Medical Sciences, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (C.N.); (C.W.-C.); (R.A.-L.)
| | - Cameil Wilson-Clarke
- Department of Basic Medical Sciences, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (C.N.); (C.W.-C.); (R.A.-L.)
| | - Melisa Anderson-Cross
- School of Allied Health and Wellness, College of Health Sciences, University of Technology, Kingston 7, Jamaica;
| | - Jabari Brown
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Lennox Anderson-Jackson
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Lowen Williams
- Department of Biotechnology, Faculty of Science and Technology, The University of the West Indies, Kingston 7, Jamaica;
| | - Lyndon Latore
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Rory Thompson
- Department of Pathology, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (K.V.); (J.B.); (L.A.-J.); (L.L.); (R.T.)
| | - Ruby Alexander-Lindo
- Department of Basic Medical Sciences, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica; (C.N.); (C.W.-C.); (R.A.-L.)
| |
Collapse
|
10
|
Effects of MTHFR genetic polymorphism on inflammatory protein osteopontin in RA patients: A gender based study in North Indian population. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
11
|
Bulk and single cell transcriptomic data indicate that a dichotomy between inflammatory pathways in peripheral blood and arthritic joints complicates biomarker discovery. Cytokine 2020; 127:154960. [DOI: 10.1016/j.cyto.2019.154960] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 12/03/2019] [Accepted: 12/19/2019] [Indexed: 12/13/2022]
|
12
|
Scholtysek C, Ipseiz N, Böhm C, Krishnacoumar B, Stenzel M, Czerwinski T, Palumbo-Zerr K, Rothe T, Weidner D, Klej A, Stoll C, Distler J, Tuckermann J, Herrmann M, Fabry B, Goldmann WH, Schett G, Krönke G. NR4A1 Regulates Motility of Osteoclast Precursors and Serves as Target for the Modulation of Systemic Bone Turnover. J Bone Miner Res 2018; 33:2035-2047. [PMID: 29949664 DOI: 10.1002/jbmr.3533] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 05/29/2018] [Accepted: 06/21/2018] [Indexed: 11/10/2022]
Abstract
NR4A1 (Nur77 or NGFI-B), an orphan member of the nuclear receptor superfamily, has been identified as a key regulator of the differentiation and function of myeloid, lymphoid, and mesenchymal cells. The detailed role of NR4A1 in bone biology is incompletely understood. Here, we report a role for NR4A1 as novel factor controlling the migration and recruitment of osteoclast precursors during bone remodeling. Myeloid-specific but not osteoblast-specific deletion of NR4A1 resulted in osteopenia due to an increase in the number of bone-lining osteoclasts. Although NR4A1-deficient osteoclast precursors displayed a regular differentiation into mature osteoclasts, they showed a hyper-motile phenotype that was largely dependent on increased osteopontin expression, suggesting that expression of NR4A1 negatively controlled osteopontin-mediated recruitment of osteoclast precursors to the trabecular bone. Pharmacological activation of NR4A1, in turn, inhibited osteopontin expression and osteopontin-dependent migration of osteoclast precursors resulted in reduced abundance of bone-resorbing osteoclasts in vivo as well as in an ameliorated bone loss after ovariectomy in mice. This study identifies NR4A1 as a crucial player in the regulation of osteoclast biology and bone remodeling and highlights this nuclear receptor as a promising target for therapeutic intervention during the treatment of osteoporosis. © 2018 The Authors. Journal of Bone and Mineral Research Published by Wiley Periodicals Inc.
Collapse
Affiliation(s)
- Carina Scholtysek
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Natacha Ipseiz
- School of Medicine, University of Cardiff, Cardiff, Wales
| | - Christina Böhm
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Brenda Krishnacoumar
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Martin Stenzel
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Tina Czerwinski
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Katrin Palumbo-Zerr
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Tobias Rothe
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Daniela Weidner
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Alexandra Klej
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Cornelia Stoll
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Jörg Distler
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Jan Tuckermann
- Institute of Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Martin Herrmann
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Ben Fabry
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Wolfgang H Goldmann
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany
| | - Gerhard Krönke
- Department of Internal Medicine 3, University of Erlangen-Nuremberg, Erlangen, Germany.,Nikolaus Fiebiger Center of Molecular Medicine, University of Erlangen-Nuremberg, Erlangen, Germany
| |
Collapse
|
13
|
Methylglyoxal-bis-guanylhydrazone inhibits osteopontin expression and differentiation in cultured human monocytes. PLoS One 2018. [PMID: 29538412 PMCID: PMC5851547 DOI: 10.1371/journal.pone.0192680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Monocyte activation and polarization play essential roles in many chronic inflammatory diseases. An imbalance of M1 and M2 macrophage activation (pro-inflammatory and alternatively activated, respectively) is believed to be a key aspect in the etiology of these diseases, thus a therapeutic approach that regulates macrophage activation could be of broad clinical relevance. Methylglyoxal-bis-guanylhydrazone (MGBG), a regulator of polyamine metabolism, has recently been shown to be concentrated in monocytes and macrophages, and interfere with HIV integration into the DNA of these cells in vitro. RNA expression analysis of monocytes from HIV+ and control donors with or without MGBG treatment revealed the only gene to be consistently down regulated by MGBG to be osteopontin (OPN). The elevated expression of this pro-inflammatory cytokine and monocyte chemoattractant is associated with various chronic inflammatory diseases. We demonstrate that MGBG is a potent inhibitor of secreted OPN (sOPN) in cultured monocytes with 50% inhibition achieved at 0.1 μM of the drug. Furthermore, inhibition of OPN RNA transcription in monocyte cultures occurs at similar concentrations of the drug. During differentiation of monocytes into macrophages in vitro, monocytes express cell surface CD16 and the cells undergo limited DNA synthesis as measured by uptake of BrdU. MGBG inhibited both activities at similar doses to those regulating OPN expression. In addition, monocyte treatment with MGBG inhibited differentiation into both M1 and M2 classes of macrophages at non-toxic doses. The inhibition of differentiation and anti-OPN effects of MGBG were specific for monocytes in that differentiated macrophages were nearly resistant to MGBG activities. Thus MGBG may have potential therapeutic utility in reducing or normalizing OPN levels and regulating monocyte activation in diseases that involve chronic inflammation.
Collapse
|
14
|
Mehta BB, Tiwari A, Sharma S, Shukla A, Sharma M, Vasishta RK, Sen RK, Sharma A, Luthra-Guptasarma M. Amelioration of collagen antibody induced arthritis in mice by an antibody directed against the fibronectin type III repeats of tenascin-C: Targeting fibronectin type III repeats of tenascin-C in rheumatoid arthritis. Int Immunopharmacol 2018. [PMID: 29529488 DOI: 10.1016/j.intimp.2018.02.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Tenascin-C (TN-C) levels are elevated in the synovial tissue and fluid, as well as cartilage of rheumatoid arthritis (RA) patients. In addition, the presence of TN-C fragments has also been documented in arthritic cartilage. We have previously shown that a single chain variable fragment antibody (TN64), directed against the fibronectin type III repeats 1-5 (TNfnIII 1-5) of TN-C, effectively inhibits fibrotic pathology. Given that fibrosis results from chronic inflammation, and the fact that increased levels of TN-C in the synovial fluid of patients with RA contributes to synovial inflammation and joint destruction, we aimed to investigate the role of TNfnIII 1-5 region of TN-C in RA pathogenesis. Using either the wild type or variants of the two integrin-binding motifs (RGD and AEIDGIEL) present within the TNfnIII 1-5 polypeptide, we demonstrate that the adhesion and migration of synovial fibroblasts is RGD-dependent. The antibody TN64 is effective in inhibiting migration of cells in response to TnfnIII 1-5, and prevents fibroblast-mediated destruction of cartilage. The TN64 antibody was further tested in collagen antibody induced arthritic (CAIA) mice. Our data shows the efficacy of TN64 in preventing induction of arthritis, with significant downregulation of RA-associated cytokines. This suggests that components of the extracellular matrix such as the TNfnIII 1-5 region of TN-C could be exploited to develop therapies to suppress inflammation seen in RA. The TN64 antibody is one such promising candidate in the development of novel treatments for RA.
Collapse
Affiliation(s)
- Brij Bhushan Mehta
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Anil Tiwari
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Saniya Sharma
- Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Ashu Shukla
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Maryada Sharma
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Rakesh K Vasishta
- Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Ramesh K Sen
- Department of Orthopaedics, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Aman Sharma
- Department of Internal Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
| | - Manni Luthra-Guptasarma
- Department of Immunopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India.
| |
Collapse
|
15
|
Qian J, Xu L, Sun X, Wang Y, Xuan W, Zhang Q, Zhao P, Wu Q, Liu R, Che N, Wang F, Tan W, Zhang M. Adiponectin aggravates bone erosion by promoting osteopontin production in synovial tissue of rheumatoid arthritis. Arthritis Res Ther 2018; 20:26. [PMID: 29422077 PMCID: PMC5806355 DOI: 10.1186/s13075-018-1526-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 01/23/2018] [Indexed: 12/29/2022] Open
Abstract
Background We have previously reported that adiponectin (AD), an adipokine that is secreted by adipocytes, correlates well with progressive bone erosion in rheumatoid arthritis (RA). The exact mechanism of AD in promoting joint destruction remains unclear. Osteopontin (OPN) is required for osteoclast recruitment. We hypothesized that AD exacerbates bone erosion by inducing OPN expression in synovial tissue. This study aimed to evaluate a novel role for AD in RA. Methods The serum levels of AD and OPN were determined in 38 patients with RA, 40 patients with osteoarthritis (OA), and 20 healthy controls using enzyme-linked immunosorbent assay (ELISA). AD and OPN production were measured by double immunofluorescence in RA and OA synovial tissue. Quantitative real-time PCR and immunofluorescence were used to evaluate the mRNA and protein expression levels of OPN in RA synovial fibroblasts (RASFs) and OA synovial fibroblasts after pre-incubation with AD, respectively. Migration of the RAW264.7 osteoclast precursor cell line was assessed using the Transwell migration assay and co-culture system. Bone destruction and osteoclastogenesis were assessed by immunohistochemical staining, microcomputed tomography and tartrate-resistant acid phosphatase (TRAP) staining in AD-treated collagen-induced arthritis (CIA) mice with or without OPN silencing. The expression levels of OPN and integrin αvβ3 in the ankle joint tissues of the mice were examined by double immunofluorescence. Results Our results indicated that the AD and OPN expression levels increased noticeably and were associated with each other in the RA serum. The AD distribution was coincident with that of OPN in the RA synovial tissue. AD stimulation of RASFs increased OPN production in a dose-dependent manner. AD-treated RASFs promoted RAW264.7 cell migration, and the effect was blocked with a specific antibody against OPN. Silencing of OPN using lentiviral-OPN short hairpin RNA reduced the number of TRAP-positive osteoclasts and the extent of bone erosion in the AD-treated CIA mice. When bound to integrin αvβ3, OPN functions as a mediator of AD and osteoclasts. Conclusions Our study provides new evidence of AD involvement in bone erosion. AD induces the expression of OPN, which recruits osteoclasts and initiates bone erosion. These data highlight AD as a novel target for RA treatment. Electronic supplementary material The online version of this article (10.1186/s13075-018-1526-y) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Jie Qian
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China.,Department of Rheumatology, Affiliated Hospital of Nantong University, 20 Xisi Road, Nantong, 226001, China
| | - Lingxiao Xu
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China.
| | - Xiaoxuan Sun
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Yani Wang
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Wenhua Xuan
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Qian Zhang
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Pengfei Zhao
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Qin Wu
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Rui Liu
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Nan Che
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Fang Wang
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Wenfeng Tan
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China
| | - Miaojia Zhang
- Department of Rheumatology, The First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China.
| |
Collapse
|
16
|
Liu Y, Qian K, Li C, Ma Y, Chen X. Roles of microRNA-539 and osteopontin in rheumatoid arthritis. Exp Ther Med 2017; 15:2681-2687. [PMID: 29467860 DOI: 10.3892/etm.2017.5665] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 06/05/2017] [Indexed: 01/16/2023] Open
Abstract
The present study aimed to investigate the role and mechanism of microRNA-539 (miR-539) in rheumatoid arthritis (RA). A total of 68 RA patients and 46 osteoarthritis patients were enrolled into the current study. Peripheral blood and joint fluid were collected prior to treatment. Reverse transcription-quantitative polymerase chain reaction was performed to detect osteopontin (OPN) mRNA and miR-539 expression levels, while ELISA and western blot analysis were applied to detect OPN protein expression. In addition, bioinformatics analysis predicted that miR-539 directly targeted OPN, while dual-luciferase assay was used to validate this finding. Furthermore, agomiR-539 transfection and OPN knockdown by siRNA were conducted in MH7A cells, and MTT assay was used to detect MH7A cell proliferation. The results indicated that OPN was significantly increased in the blood and joint fluid of RA patients, while miR-539 expression was significantly decreased in the two types of specimens (P<0.05). Subsequent to silencing OPN by siRNA, the proliferation of MH7A cells was decreased (P<0.05). Following upregulation of miR-539, OPN expression was significantly decreased and cell proliferation was inhibited. Dual-luciferase assay revealed that miR-539 regulated OPN expression through complementary binding to 3'-untranslated region. OPN was also significantly increased in the blood and joint fluid of RA patients, which may be associated with the downregulation of miR-539. Thus, miR-539 may promote the development and progression of RA through regulating OPN.
Collapse
Affiliation(s)
- Yan Liu
- Department of Rheumatology, Huai'an First People's Hospital, Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
| | - Kai Qian
- Department of Rheumatology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
| | - Chunmei Li
- Department of Rheumatology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
| | - Yi Ma
- Department of Rheumatology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
| | - Xingguo Chen
- Department of Rheumatology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
| |
Collapse
|
17
|
Lavi H, Assayag M, Schwartz A, Arish N, Fridlender ZG, Berkman N. The association between osteopontin gene polymorphisms, osteopontin expression and sarcoidosis. PLoS One 2017; 12:e0171945. [PMID: 28253271 PMCID: PMC5333822 DOI: 10.1371/journal.pone.0171945] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 01/27/2017] [Indexed: 01/31/2023] Open
Abstract
Background Sarcoidosis is a systemic inflammatory disease of unknown etiology. Osteopontin (SPP1, OPN) is an extra cellular matrix glycoprotein and cytokine with a known role in granuloma formation and in autoimmune and inflammatory diseases. Objective To determine whether plasma OPN levels are elevated in patients with sarcoidosis and compare the frequency of four single nucleotide polymorphism (SNPs) variants in the OPN gene in sarcoidosis patients compared to healthy controls. Methods Demographic and clinical information, radiological studies and pulmonary function tests were evaluated in 113 patients with sarcoidosis and in 79 healthy controls. Blood samples were analyzed for SNPs of the OPN gene and for plasma OPN and CRP levels. Association between clinical features of disease and OPN levels as well as SNP frequencies was determined. Results Plasma OPN levels were higher in sarcoidosis patients than in healthy subjects, (median: 217 vs 122ng/ml, p<0.001). Area under the curve for receiver operator curves (ROC) was 0.798 (0.686–0.909 95% CI.) No differences were observed between sarcoidosis patients and controls in the frequency of any of the SNPs evaluated. Presence of lung parenchymal involvement was associated with SNP distribution at rs1126772 (p = 0.02). We found no correlation between SNPs distribution and plasma OPN levels. Conclusions Osteopontin protein levels are elevated in sarcoidosis. We found no evidence for an association between SNPs on the osteopontin gene and plasma OPN levels or the presence of sarcoidosis, however, an association between genotype and several phenotypic clinical parameters of disease was observed.
Collapse
Affiliation(s)
- Hadas Lavi
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
| | - Miri Assayag
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
| | - Assaf Schwartz
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
| | - Nissim Arish
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
| | - Zvi G. Fridlender
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
| | - Neville Berkman
- Institute of Pulmonary Medicine, Hebrew University Hadassah Medical Center, Jerusalem, Israel
- * E-mail:
| |
Collapse
|
18
|
Tsai CH, Liu SC, Wang YH, Su CM, Huang CC, Hsu CJ, Tang CH. Osteopontin inhibition of miR-129-3p enhances IL-17 expression and monocyte migration in rheumatoid arthritis. Biochim Biophys Acta Gen Subj 2016; 1861:15-22. [PMID: 27851983 DOI: 10.1016/j.bbagen.2016.11.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 10/05/2016] [Accepted: 11/11/2016] [Indexed: 12/25/2022]
Abstract
BACKGROUND Osteopontin (OPN) is an important proinflammatory cytokine in rheumatoid arthritis (RA). Levels of OPN have been shown to be significantly correlated with interleukin-17 (IL-17) production and expression of Th17 cells in the synovial fluid of RA patients. Here, we investigated the role of OPN in monocyte migration, IL-17 production and osteoblasts. METHODS OPN and IL-17 expression profiles in osteoarthritis (OA) and RA synovial fluid were determined by enzyme-linked immunosorbent assay (ELISA). The expression of the microRNA, miR-129-3p, in osteoblasts was analyzed by real-time quantitative polymerase chain reaction (qPCR). Immunoreactive proteins were spotted by Western blotting. We used the collagen-induced arthritis (CIA) mouse model to investigate the role of OPN in monocyte migration during RA. RESULTS OPN and IL-17 expression were higher in RA synovial fluid as compared to OA samples. We also found that OPN promotes IL-17 expression in osteoblasts and thereby enhances monocyte migration via the Syk/PI3K/Akt signaling pathway. miR-129-3p expression was found to be negatively regulated by OPN via the Syk/PI3K/Akt signal cascade. In contrast, lentiviral vectors expressing short hairpin RNA inhibited OPN expression and ameliorated articular swelling, cartilage erosion and monocyte infiltration in the ankle joints of CIA mice. CONCLUSION To our knowledge, our study is the first to describe how OPN promotes monocyte migration by upregulating IL-17 expression in osteoblasts in RA disease. SIGNIFICANCE These findings indicate that OPN could serve as a potential therapeutic target for the treatment of RA.
Collapse
Affiliation(s)
- Chun-Hao Tsai
- School of Medicine, China Medical University, Taichung, Taiwan; Department of Orthopedic Surgery, China Medical University Hospital, Taichung, Taiwan
| | - Shan-Chi Liu
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan
| | - Yu-Han Wang
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan
| | - Chen-Ming Su
- Department of Biomedical Sciences Laboratory, Affiliated Dongyang Hospital of Wenzhou Medical University, Dongyang, Zhejiang, China
| | - Chien-Chung Huang
- Division of Immunology and Rheumatology, Department of Internal Medicine, China Medical University Hospital, Taichung, Taiwan; Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan
| | - Chin-Jung Hsu
- Department of Orthopedic Surgery, China Medical University Hospital, Taichung, Taiwan; School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Chih-Hsin Tang
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan; Department of Pharmacology, School of Medicine, China Medical University, Taichung, Taiwan; Department of Biotechnology, College of Health Science, Asia University, Taichung, Taiwan.
| |
Collapse
|
19
|
Jürets A, Le Bras M, Staffler G, Stein G, Leitner L, Neuhofer A, Tardelli M, Turkof E, Zeyda M, Stulnig TM. Inhibition of Cellular Adhesion by Immunological Targeting of Osteopontin Neoepitopes Generated through Matrix Metalloproteinase and Thrombin Cleavage. PLoS One 2016; 11:e0148333. [PMID: 26840958 PMCID: PMC4740464 DOI: 10.1371/journal.pone.0148333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/15/2016] [Indexed: 01/10/2023] Open
Abstract
Osteopontin (OPN), a secreted protein involved in inflammatory processes and cancer, induces cell adhesion, migration, and activation of inflammatory pathways in various cell types. Cells bind OPN via integrins at a canonical RGD region in the full length form as well as to a contiguous cryptic site that some have shown is unmasked upon thrombin or matrix metalloproteinase cleavage. Thus, the adhesive capacity of osteopontin is enhanced by proteolytic cleavage that may occur in inflammatory conditions such as obesity, atherosclerosis, rheumatoid arthritis, tumor growth and metastasis. Our aim was to inhibit cellular adhesion to recombinant truncated proteins that correspond to the N-terminal cleavage products of thrombin- or matrix metalloproteinase-cleaved OPN in vitro. We specifically targeted the cryptic integrin binding site with monoclonal antibodies and antisera induced by peptide immunization of mice. HEK 293 cells adhered markedly stronger to truncated OPN proteins than to full length OPN. Without affecting cell binding to the full length form, the raised monoclonal antibodies specifically impeded cellular adhesion to the OPN fragments. Moreover, we show that the peptides used for immunization were able to induce antisera, which impeded adhesion either to all OPN forms, including the full-length form, or selectively to the corresponding truncated recombinant proteins. In conclusion, we developed immunological tools to selectively target functional properties of protease-cleaved OPN forms, which could find applications in treatment and prevention of various inflammatory diseases and cancers.
Collapse
Affiliation(s)
- Alexander Jürets
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | | | | | - Gesine Stein
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Lukas Leitner
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Angelika Neuhofer
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Matteo Tardelli
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Edvin Turkof
- Department of Plastic and Reconstructive Surgery, Medical University of Vienna, Vienna, Austria
| | - Maximilian Zeyda
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Thomas M. Stulnig
- Christian Doppler Laboratory for Cardio-Metabolic Immunotherapy and Clinical Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
- * E-mail:
| |
Collapse
|
20
|
Roy K, Kanwar RK, Kanwar JR. Molecular targets in arthritis and recent trends in nanotherapy. Int J Nanomedicine 2015; 10:5407-20. [PMID: 26345140 PMCID: PMC4554438 DOI: 10.2147/ijn.s89156] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Due to its severity and increasing epidemiology, arthritis needs no description. There are various forms of arthritis most of which are disabling, very painful, and common. In spite of breakthroughs in the field of drug discovery, there is no cure for arthritis that can eliminate the disease permanently and ease the pain. The present review focuses on some of the most successful drugs in arthritis therapy and their side effects. Potential new targets in arthritis therapy such as interleukin-1β, interleukin-17A, tumor necrosis factor alpha, osteopontin, and several others have been discussed here, which can lead to refinement of current therapeutic modalities. Mechanisms for different forms of arthritis have been discussed along with the molecules that act as potential biomarkers for arthritis. Due to the difficulty in monitoring the disease progression to detect the advanced manifestations of the diseases, drug-induced cytotoxicity, and problems with drug delivery; nanoparticle therapy has gained the attention of the researchers. The unique properties of nanoparticles make them highly attractive for the design of novel therapeutics or diagnostic agents for arthritis. The review also focuses on the recent trends in nanoformulation development used for arthritis therapy. This review is, therefore, important because it describes the relevance and need for more arthritis research, it brings forth a critical discussion of successful drugs in arthritis and analyses the key molecular targets. The review also identifies several knowledge gaps in the published research so far along with the proposal of new ideas and future directions in arthritis therapy.
Collapse
Affiliation(s)
- Kislay Roy
- Nanomedicine-Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), Centre for Molecular and Medical Research (C-MMR), Strategic Research Centre, School of Medicine (SoM), Faculty of Health, Deakin University, Waurn Ponds, VIC, Australia
| | - Rupinder Kaur Kanwar
- Nanomedicine-Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), Centre for Molecular and Medical Research (C-MMR), Strategic Research Centre, School of Medicine (SoM), Faculty of Health, Deakin University, Waurn Ponds, VIC, Australia
| | - Jagat Rakesh Kanwar
- Nanomedicine-Laboratory of Immunology and Molecular Biomedical Research (NLIMBR), Centre for Molecular and Medical Research (C-MMR), Strategic Research Centre, School of Medicine (SoM), Faculty of Health, Deakin University, Waurn Ponds, VIC, Australia
| |
Collapse
|
21
|
Su CM, Chiang YC, Huang CY, Hsu CJ, Fong YC, Tang CH. Osteopontin Promotes Oncostatin M Production in Human Osteoblasts: Implication of Rheumatoid Arthritis Therapy. THE JOURNAL OF IMMUNOLOGY 2015; 195:3355-64. [PMID: 26304992 DOI: 10.4049/jimmunol.1403191] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 07/23/2015] [Indexed: 12/21/2022]
Abstract
Accumulating evidence indicates that subchondral bone might play an essential role in rheumatoid arthritis (RA). Osteopontin (OPN) induces the production of an important proinflammatory cytokine involved in the pathogenesis of RA. This study evaluated the activation of oncostatin M (OSM) by OPN in human primary osteoblasts to understand RA pathogenesis and characterized the intracellular signaling pathways involved in this activation. Quantitative PCR, ELISA, and Western blot results indicated that stimulation of human primary osteoblasts with OPN induces OSM expression through αvβ3 integrin/c-Src/platelet-derived growth factor receptor transactivation/MEK/ERK. Treatment of osteoblasts with OPN also increased c-Jun phosphorylation, AP-1 luciferase activity, and c-Jun binding to the AP-1 element on the OSM promoter, as demonstrated using chromatin immunoprecipitation assay. Moreover, inhibition of OPN expression using lentiviral-OPN short hairpin RNA resulted in the amelioration of articular swelling, cartilage erosion, and OSM expression in the ankle joint of mice with collagen-induced arthritis as shown using microcomputed tomography and immunohistochemistry staining. Our results imply that OSM expression in osteoblasts increases in response to OPN-induced inflammation in vitro. Finally, lentiviral-OPN short hairpin RNA ameliorates the inflammatory response and bone destruction in mice with collagen-induced arthritis. Therefore, OPN may be a potential therapeutic target for RA.
Collapse
Affiliation(s)
- Chen-Ming Su
- Department of Biomedical Sciences Laboratory, Affiliated Dongyang Hospital of Wenzhou Medical University, Dongyang, Zhejiang, China 322100; Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan 40466
| | - Yi-Chun Chiang
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan 40466
| | - Chun-Yin Huang
- Graduate Institute of Clinical Medical Science, China Medical University, Taichung, Taiwan 40466; Department of Orthopedic Surgery, China Medical University Beigang Hospital, Yun-Lin County, Taiwan 65142
| | - Chin-Jung Hsu
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan 40466; Department of Orthopedic Surgery, China Medical University Hospital, Taichung, Taiwan 40466
| | - Yi-Chin Fong
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan 40466; Department of Orthopedic Surgery, China Medical University Hospital, Taichung, Taiwan 40466
| | - Chih-Hsin Tang
- Graduate Institute of Basic Medical Science, China Medical University, Taichung, Taiwan 40466; Department of Pharmacology, School of Medicine, China Medical University, Taichung, Taiwan 40466; and Department of Biotechnology, College of Health Science, Asia University, Taichung, Taiwan 40466
| |
Collapse
|
22
|
Gao SG, Zeng C, Song Y, Tian J, Cheng C, Yang T, Li H, Zhang FJ, Lei GH. Effect of osteopontin on the mRNA expression of ADAMTS4 and ADAMTS5 in chondrocytes from patients with knee osteoarthritis. Exp Ther Med 2015; 9:1979-1983. [PMID: 26136925 DOI: 10.3892/etm.2015.2310] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 02/11/2015] [Indexed: 01/07/2023] Open
Abstract
Previous studies have demonstrated that osteopontin (OPN) levels are elevated in the synovial fluid and articular cartilage, and are associated with the severity of knee osteoarthritis (OA). However, the role of OPN in the pathogenesis of OA has yet to be elucidated. The present study aimed to investigate the effects of OPN on the expression of the aggrecanases, a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS)4 and ADAMTS5, in human OA chondrocytes, as they serve a key function in aggrecan degradation. Human OA chondrocytes were obtained from the knees of 16 patients with OA, and subsequently cultured in a monolayer. The chondrocytes were divided into three groups, which included the control (no treatment), N-OPN (treated with 100 ng/ml OPN, the normal circulating OPN concentration) and the H-OPN groups (treated with 1 µg/ml OPN, a high OPN concentration). Reverse transcription-quantitative polymerase chain reaction was performed to quantify the relative mRNA expression levels of ADAMTS4, ADAMTS5 and aggrecan in the chondrocytes. The mRNA expression levels of ADAMTS4 were significantly reduced in the N-OPN and H-OPN groups when compared with the control group (P<0.0001). In addition, the mRNA expression levels of ADAMTS4 were lower in the H-OPN group when compared with the N-OPN group (P<0.001). However, no statistically significant difference was observed in the relative mRNA expression levels of ADAMTS5 among the three groups (P>0.05). Furthermore, the mRNA expression levels of aggrecan were higher in the N-OPN and H-OPN groups when compared with the control group (P<0.0001), and a statistically significant difference was observed between the N-OPN and H-OPN groups with regard to the mRNA expression of aggrecan (P<0.0001). These results demonstrated that OPN may exert a protective effect in human OA chondrocytes against aggrecan degradation by suppressing the expression of ADAMTS4.
Collapse
Affiliation(s)
- Shu-Guang Gao
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Orthopedics Institute, Central South University, Changsha, Hunan 410008, P.R. China
| | - Chao Zeng
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Yang Song
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Department of Orthopedics, Linyi People's Hospital, Linyi, Shandong 276001, P.R. China
| | - Jian Tian
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Chao Cheng
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Tuo Yang
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Hui Li
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Fang-Jie Zhang
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Guang-Hua Lei
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Orthopedics Institute, Central South University, Changsha, Hunan 410008, P.R. China
| |
Collapse
|
23
|
Zhang F, Luo W, Li Y, Gao S, Lei G. Role of osteopontin in rheumatoid arthritis. Rheumatol Int 2014; 35:589-95. [PMID: 25163663 DOI: 10.1007/s00296-014-3122-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 08/22/2014] [Indexed: 01/01/2023]
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disease characterized by joint swelling, joint tenderness, and destruction of synovial joints, leading to severe disability and premature mortality. RA is a multifactorial disease with genetic, environmental, and stochastic components related to its susceptibility. It has been demonstrated that the expression of osteopontin (OPN) is upregulated in the RA patients. Numerous studies have indicated that the full-length OPN or even OPN fragments, such as thrombin-cleaved OPN and its receptors, play the key roles in RA pathogenesis. Therapeutic application of siRNA to target OPN or neutralizing antibodies related to OPN epitopes in RA animal models are in progress, and some results are encouraging. However, there is a long way to go along with the clinical trials. This review focuses on the recent development in research associated with the OPN role in the pathogenesis of RA and provides insights concerning the OPN targeting as therapeutic approaches for patients with RA.
Collapse
Affiliation(s)
- Fangjie Zhang
- Department of Orthopaedics, Xiangya Hospital, Central South University, No. 87 Xiangya Road, Changsha, 410008, Hunan, China
| | | | | | | | | |
Collapse
|
24
|
Zhang FJ, Yu WB, Luo W, Gao SG, Li YS, Lei GH. Effect of osteopontin on TIMP-1 and TIMP-2 mRNA in chondrocytes of human knee osteoarthritis in vitro.. Exp Ther Med 2014; 8:391-394. [PMID: 25009588 PMCID: PMC4079415 DOI: 10.3892/etm.2014.1750] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 05/02/2014] [Indexed: 01/09/2023] Open
Abstract
Tissue inhibitors of metalloproteinases (TIMPs) regulate the activity of matrix metalloproteinases (MMPs) and enzymes from the a disintegrin and metalloproteinase domain with thrombospondin motifs family in osteoarthritis (OA). Elevated osteopontin (OPN) levels in plasma, synovial fluid and articular cartilage are associated with progressive OA joint damage; however, the role of OPN in the pathological changes of knee OA remains undetermined. The present study was undertaken to examine the effect of OPN on the expression of TIMP-1 and TIMP-2 mRNA in chondrocytes from 16 patients with knee OA. In this study, following the stimulation of human chondrocytes with recombinant human OPN (rhOPN; 100 ng/ml and 1 μg/ml, respectively) for 48 h, MTT assay was used to determine cell viability while the quantitative polymerase chain reaction (PCR) was used to detect the alterations in TIMP-1 and TIMP-2 levels. The results illustrated that neither 100 ng/ml nor 1 μg/ml rhOPN caused cytotoxicity or apoptosis of chondrocytes and that the relative mRNA expression of TIMP-1 and TIMP-2 was significantly increased in the 1 μg/ml rhOPN group compared with that in the control group (P=0.022 and P=0.003, respectively). However, no significant difference in expression was revealed between the 100 ng/ml rhOPN and control groups (P=0.998 and P=0.209, respectively). In conclusion, OPN may have a protective effect against pathological changes in advanced-stage OA.
Collapse
Affiliation(s)
- Fang-Jie Zhang
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Wen-Bo Yu
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Department of Orthopaedics, The First People's Hospital of Nanpin, Nanpin, Fujian 353000, P.R. China
| | - Wei Luo
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Shu-Guang Gao
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Orthopaedics Institute of Central South University, Changsha, Hunan 410008, P.R. China
| | - Yu-Sheng Li
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Guang-Hua Lei
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China ; Orthopaedics Institute of Central South University, Changsha, Hunan 410008, P.R. China
| |
Collapse
|
25
|
Elevated osteopontin levels in mild cognitive impairment and Alzheimer's disease. Mediators Inflamm 2013; 2013:615745. [PMID: 23576854 PMCID: PMC3612435 DOI: 10.1155/2013/615745] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Revised: 01/30/2013] [Accepted: 02/14/2013] [Indexed: 01/01/2023] Open
Abstract
Inflammatory mediators are closely associated with the pathogenesis of neurodegenerative changes in Alzheimer's disease (AD) and mild cognitive impairment (MCI). Osteopontin (OPN) is a proinflammatory cytokine that has been shown to play an important role in various neuroinflammatory diseases. However, the function of OPN in AD and MCI progression is not well defined. Cerebrospinal fluid (CSF) and plasma samples were obtained from 35 AD patients, 31 MCI patients, and 20 other noninflammatory neurologic diseases (OND). Concentrations of OPN in the CSF and plasma were determined by enzyme-linked immunosorbent assay. During a 3-year clinical followup, 13 MCI patients converted to AD (MCI converters), and 18 were clinically stable (MCI nonconverters). CSF OPN concentrations were significantly increased in AD and MCI converters compared to OND, and increased levels of OPN in AD were associated with MMSE score; OPN protein levels both in the CSF and plasma of newly diagnosed AD patients were higher than that of chronical patients. In MCI converters individuals tested longitudinally, both plasma and CSF OPN concentrations were significantly elevated when they received a diagnosis of AD during followup. Further wide-scale studies are necessary to confirm these results and to shed light on the etiopathogenic role of osteopontin in AD.
Collapse
|
26
|
Gao SG, Cheng L, Zeng C, Wei LC, Zhang FJ, Tian J, Tu M, Luo W, Lei GH. Usefulness of specific OA biomarkers, thrombin-cleaved osteopontin, in the posterior cruciate ligament OA rabbit model. Osteoarthritis Cartilage 2013; 21:144-50. [PMID: 23025929 DOI: 10.1016/j.joca.2012.09.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 08/29/2012] [Accepted: 09/11/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE We undertook this study to determine whether thrombin-cleaved osteopontin (OPN) in synovial fluid (SF) represents a useful marker of osteoarthritis (OA) progression in the posterior cruciate ligament transection (PCLT) OA rabbit model. METHOD PCLT was performed on the right knee joints of 48 rabbits. The rabbits were then sacrificed separately at 4, 8, 16, and 24 weeks post-surgery, when the joint was harvested and macroscopic and histological assessments of articular cartilage were performed. Thrombin-cleaved OPN product in SF was determined using Western blotting and the levels were measured using an enzyme-linked immunoassay. RESULTS The macroscopic and histological scores for PCLT knees were already elevated 4 weeks after surgery and increased with time. Western blotting showed the presence of thrombin-cleaved OPN in SF from PCLT knees. Thrombin-cleaved OPN levels in SF were elevated at 4 weeks (P < 0.001) and were elevated peaking at 24 weeks (P < 0.00001) after PCLT compared to baseline. A positive significant correlation was found between thrombin-cleaved OPN levels and the macroscopic scores (8 weeks: ρ = 0.695, P = 0.012; 16 weeks: ρ = 0.751, P = 0.005; 24 weeks: ρ = 0.660, P = 0.020). Furthermore, the same correlation was noted between thrombin-cleaved OPN levels and the histological scores (4 weeks: ρ = 0.609, P = 0.036; 8 weeks: ρ = 0.662, P = 0.019; 16 weeks: ρ = 0.827, P = 0.001; 24 weeks: ρ = 0.813, P = 0.001). CONCLUSION In this rabbit model of PCLT, thrombin-cleaved OPN levels in SF appear to provide a useful marker of OA disease severity and progression.
Collapse
Affiliation(s)
- S G Gao
- Department of Orthopaedics, Xiangya Hospital, Central South University, #87 Xiangya Road, Changsha, Hunan 410008, China.
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Mohammed FI, Abd El-Azeem MI, KamalElDin AM. Plasma and synovial fluid osteopontin levels in patients with knee osteoarthritis: Relation to radiological grade. EGYPTIAN RHEUMATOLOGIST 2012. [DOI: 10.1016/j.ejr.2012.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
28
|
Nikitopoulou I, Oikonomou N, Karouzakis E, Sevastou I, Nikolaidou-Katsaridou N, Zhao Z, Mersinias V, Armaka M, Xu Y, Masu M, Mills GB, Gay S, Kollias G, Aidinis V. Autotaxin expression from synovial fibroblasts is essential for the pathogenesis of modeled arthritis. ACTA ACUST UNITED AC 2012; 209:925-33. [PMID: 22493518 PMCID: PMC3348105 DOI: 10.1084/jem.20112012] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Synovial fibroblasts from patients and mice with arthritis express autotaxin, and ablation of autotaxin in fibroblasts ameliorates disease. Rheumatoid arthritis is a destructive arthropathy characterized by chronic synovial inflammation that imposes a substantial socioeconomic burden. Under the influence of the proinflammatory milieu, synovial fibroblasts (SFs), the main effector cells in disease pathogenesis, become activated and hyperplastic, releasing proinflammatory factors and tissue-remodeling enzymes. This study shows that activated arthritic SFs from human patients and animal models express significant quantities of autotaxin (ATX; ENPP2), a lysophospholipase D that catalyzes the conversion of lysophosphatidylcholine to lysophosphatidic acid (LPA). ATX expression from SFs was induced by TNF, and LPA induced SF activation and effector functions in synergy with TNF. Conditional genetic ablation of ATX in mesenchymal cells, including SFs, resulted in disease attenuation in animal models of arthritis, establishing the ATX/LPA axis as a novel player in chronic inflammation and the pathogenesis of arthritis and a promising therapeutic target.
Collapse
Affiliation(s)
- Ioanna Nikitopoulou
- Institute of Immunology, Alexander Fleming Biomedical Sciences Research Center, 16672 Athens, Greece
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Abstract
Within classical extracellular matrix (ECM) proteins, there are a unique group of proteins that should be regarded as a distinct functional group of molecules. Matricellular proteins including osteopontin (OPN) and tenascin-c (TN-C) are highly expressed at the pathological foci of various inflammatory diseases. Unlike classical ECM proteins, these are soluble proteins and induce cell motility and persistent inflammation rather than providing a scaffold for stable cell adhesion. Osteopontin is a pleiotropic cytokine expressed by various cells. Two forms of OPN are present. A secreted form of OPN (sOPN) is involved in generation of T helper type 1 (Th1) and Th17 cells that are pathogenic T cells for various autoimmune diseases. An intracellular form of OPN (iOPN) is a critical regulator for Toll like receptor-9 (TLR-9) and/or TLR-7-dependent interferon-α (IFN-α) expression by plasmacytoid dendritic cells (DCs) and Th17 development. Indeed, both OPN and TN-C deficient mice are resistant to various Th1- and/or Th17-related autoimmune diseases. Interestingly, thrombin-cleaved forms of sOPN and TN-C share a common integrin receptor, α9β1, and α9β1 integrin-mediated signaling is involved in the pathogenesis of various autoimmune diseases. Thus, OPN, TN-C and its common receptor, α9β1 integrin may serve as potential therapeutic targets for various intractable inflammatory diseases.
Collapse
Affiliation(s)
- Toshimitsu Uede
- Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Kita-ku, Sapporo, Japan.
| |
Collapse
|
30
|
Distinct severe acute respiratory syndrome coronavirus-induced acute lung injury pathways in two different nonhuman primate species. J Virol 2011; 85:4234-45. [PMID: 21325418 DOI: 10.1128/jvi.02395-10] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS), caused by influenza A virus H5N1 and severe acute respiratory syndrome coronavirus (SARS-CoV), supposedly depend on activation of the oxidative-stress machinery that is coupled with innate immunity, resulting in a strong proinflammatory host response. Inflammatory cytokines, such as interleukin 1β (IL-1β), IL-8, and IL-6, play a major role in mediating and amplifying ALI/ARDS by stimulating chemotaxis and activation of neutrophils. To obtain further insight into the pathogenesis of SARS-CoV-associated ALI, we compared SARS-CoV infections in two different nonhuman primate species, cynomolgus macaques and African green monkeys. Viral titers in the upper and lower respiratory tract were not significantly different in SARS-CoV-infected macaques and African green monkeys. Inflammatory cytokines that play a major role in mediating and amplifying ALI/ARDS or have neutrophil chemoattractant activity, such as IL-6, IL-8, CXCL1, and CXCL2, were, however, induced only in macaques. In contrast, other proinflammatory cytokines and chemokines, including osteopontin and CCL3, were upregulated in the lungs of African green monkeys to a significantly greater extent than in macaques. Because African green monkeys developed more severe ALI than macaques, with hyaline membrane formation, some of these differentially expressed proinflammatory genes may be critically involved in development of the observed pathological changes. Induction of distinct proinflammatory genes after SARS-CoV infection in different nonhuman primate species needs to be taken into account when analyzing outcomes of intervention strategies in these species.
Collapse
|
31
|
Hasegawa M, Segawa T, Maeda M, Yoshida T, Sudo A. Thrombin-cleaved osteopontin levels in synovial fluid correlate with disease severity of knee osteoarthritis. J Rheumatol 2010; 38:129-34. [PMID: 21041276 DOI: 10.3899/jrheum.100637] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE although osteoarthritis (OA) is generally assessed using standard radiographic images in clinical practice, biochemical markers can be used to detect the disease and determine its severity. Osteopontin (OPN) is an extracellular matrix glycoprotein that is a potential inflammatory cytokine. Presence of the thrombin-cleaved form of OPN is well correlated with various inflammatory diseases. We examined whether thrombin-cleaved OPN in synovial fluid (SF) and synovium could be associated with the severity of knee OA. METHODS SF samples were obtained from 139 knees with OA. Thrombin-cleaved OPN product was determined using Western blotting. Levels of thrombin-cleaved and full-length OPN in SF were determined by ELISA. Synovium samples were analyzed by immunohistochemistry using an antibody specific to the thrombin-cleaved form. RESULTS western blotting showed the presence of thrombin-cleaved OPN in SF from patients with advanced OA. Concentrations of OPN full-length in OA knees were not statistically different from those in controls (p = 0.134). In contrast, levels of OPN N-half were significantly higher in OA knees than in controls (p = 0.042). Statistically significant correlation was found between thrombin-cleaved OPN and disease severity by Kellgren-Lawrence grade 1, 2, 3, and 4 (R = 0.274, p < 0.001). Immunohistochemistry of the synovium showed stronger reactivity in samples from subjects with advanced OA. CONCLUSION local generation of thrombin-cleaved OPN was increased with greater OA severity.
Collapse
Affiliation(s)
- Masahiro Hasegawa
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu City, Mie 514-8507, Japan.
| | | | | | | | | |
Collapse
|
32
|
Shio K, Kobayashi H, Asano T, Saito R, Iwadate H, Watanabe H, Sakuma H, Segawa T, Maeda M, Ohira H. Thrombin-cleaved osteopontin is increased in urine of patients with rheumatoid arthritis. J Rheumatol 2010; 37:704-10. [PMID: 20156944 DOI: 10.3899/jrheum.090582] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE To measure concentrations of the thrombin-cleaved isoform of osteopontin (OPN) in urine and plasma of patients with rheumatoid arthritis (RA), and to assess whether levels of thrombin-cleaved OPN are associated with measures of RA. METHODS Subjects comprised 70 patients with RA, 20 patients with osteoarthritis (OA), and 46 healthy controls. RA disease activity was evaluated by tender joint count, swollen joint count, patient's global assessment of disease activity, erythrocyte sedimentation rate (ESR), and levels of C-reactive protein (CRP), matrix metalloproteinase-3 (MMP-3), and rheumatoid factor (RF), as well as 28-joint count Disease Activity Score (DAS28). OPN levels in plasma and urine were measured by ELISA. RESULTS Median levels of thrombin-cleaved OPN in urine (U-half) were significantly higher in RA patients (143.5 pmol/mmol Cr) than in healthy controls (67.9 pmol/mmol Cr) or OA patients (69.8 pmol/mmol Cr). Thrombin-cleaved OPN was not detected in plasma. U-half levels correlated significantly with levels of CRP (r = 0.26, p = 0.03), ESR (r = 0.26, p = 0.03), and RF (r = 0.28, p = 0.03). Median U-half levels were significantly higher in patients with stage III (249.9 pmol/mmol Cr) and IV (251.6 pmol/mmol Cr) disease than in patients with stage I (98.6 pmol/mmol Cr) disease. CONCLUSION Our results suggest that urine levels of the thrombin-cleaved isoform of OPN may reflect the severity of active inflammatory arthritis in patients with RA.
Collapse
Affiliation(s)
- Kiori Shio
- Department of Internal Medicine II, Fukushima Medical University School of Medicine, Hikarigaoka, Fukushima, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Gao SG, Li KH, Zeng KB, Tu M, Xu M, Lei GH. Elevated osteopontin level of synovial fluid and articular cartilage is associated with disease severity in knee osteoarthritis patients. Osteoarthritis Cartilage 2010; 18:82-7. [PMID: 19747583 DOI: 10.1016/j.joca.2009.07.009] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Revised: 07/27/2009] [Accepted: 07/31/2009] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate osteopontin (OPN) levels in both synovial fluid and articular cartilage of patients with primary knee osteoarthritis (OA) and their relationship with severity of the disease. METHOD Fifty patients aged 48-81 years with knee OA and 10 healthy controls were enrolled in this study. Anteroposterior knee radiographs or/and Mankin score were taken to determine the disease severity of the affected knee. The radiographic grading of OA in the knee was performed by using the Kellgren-Lawrence criteria. OPN levels in synovial fluid were measured using enzyme-linked immunosorbent assay. OPN levels in articular cartilage were assessed by immunohistochemical methods. RESULTS Compared to healthy controls, OA patients had higher OPN concentration in synovial fluid (4519.60+/-1830.37, 95%CI 3999.42-5039.79 vs 1179.70+/-303.39, 95%CI 1035.53-1438.74 pg/ml, P<0.001)and articular cartilage(0.6+/-0.06, 95%CI 0.59-0.62 vs 0.43+/-0.07, 95%CI 0.38-0.48, P<0.01). In addition, synovial fluid OPN levels showed a positive correlation with articular cartilage OPN levels (r=0.411, 95%CI 0.150-0.619, P=0.003). Subsequent analysis showed that synovial fluid OPN levels significantly correlated with severity of disease (Spearman's rho=0.581, 95%CI 0.335-0.726, P<0.001). Furthermore, the articular cartilage levels of OPN also correlated with disease severity (Spearman's rho=0.675, 95%CI 0.500-0.808, P<0.001). CONCLUSIONS OPN in synovial fluid and articular cartilage is associated with progressive joint damage and is likely to be a useful biomarker for determining disease severity and progression in knee OA.
Collapse
Affiliation(s)
- S G Gao
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | | | | | | | | | | |
Collapse
|
34
|
Take Y, Nakata K, Hashimoto J, Tsuboi H, Nishimoto N, Ochi T, Yoshikawa H. Specifically modified osteopontin in rheumatoid arthritis fibroblast-like synoviocytes supports interaction with B cells and enhances production of interleukin-6. ACTA ACUST UNITED AC 2009; 60:3591-601. [DOI: 10.1002/art.25020] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
35
|
Sharif SA, Du X, Myles T, Song JJ, Price E, Lee DM, Goodman SB, Nagashima M, Morser J, Robinson WH, Leung LLK. Thrombin-activatable carboxypeptidase B cleavage of osteopontin regulates neutrophil survival and synoviocyte binding in rheumatoid arthritis. ACTA ACUST UNITED AC 2009; 60:2902-12. [PMID: 19790060 DOI: 10.1002/art.24814] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Osteopontin (OPN) is a proinflammatory cytokine that plays an important role in the pathogenesis of rheumatoid arthritis (RA). OPN can be cleaved by thrombin, resulting in OPN-R and exposing the cryptic C-terminal alpha4beta1 and alpha9beta1 integrin-binding motif (SVVYGLR). Thrombin-activatable carboxypeptidase B (CPB), also called thrombin-activatable fibrinolysis inhibitor, removes the C-terminal arginine from OPN-R, generating OPN-L and abrogating its enhanced cell binding. We undertook this study to investigate the roles of OPN-R and OPN-L in synoviocyte adhesion, which contributes to the formation of invasive pannus, and in neutrophil survival, which affects inflammatory infiltrates in RA. METHODS Using specifically developed enzyme-linked immunosorbent assays, we tested the synovial fluid of patients with RA, osteoarthritis (OA), and psoriatic arthritis (PsA) to determine OPN-R, OPN-L, and full-length OPN (OPN-FL) levels. RESULTS Elevated levels of OPN-R and OPN-L were found in synovial fluid samples from RA patients, but not in samples from OA or PsA patients. Increased levels of OPN-R and OPN-L correlated with increased levels of multiple inflammatory cytokines, including tumor necrosis factor alpha and interleukin-6. Immunohistochemical analyses revealed robust expression of OPN-FL, but only minimal expression of OPN-R, in RA synovium, suggesting that cleaved OPN is released into synovial fluid. In cellular assays, OPN-FL, and to a lesser extent OPN-R and OPN-L, had an antiapoptotic effect on neutrophils. OPN-R augmented RA fibroblast-like synoviocyte binding mediated by SVVYGLR binding to alpha4beta1, whereas OPN-L did not. CONCLUSION Thrombin activation of OPN (resulting in OPN-R) and its subsequent inactivation by thrombin-activatable CPB (generating OPN-L) occurs locally within inflamed joints in RA. Our data suggest that thrombin-activatable CPB plays a central homeostatic role in RA by regulating neutrophil viability and reducing synoviocyte adhesion.
Collapse
Affiliation(s)
- Shadi A Sharif
- Stanford University School of Medicine, Stanford, California, CA 94305, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
MASI LAURA, RICCI LAURA, ZULIAN FRANCESCO, DEL MONTE FRANCESCA, SIMONINI GABRIELE, CAPANNINI SERENA, DE MARTINO MAURIZIO, BRANDI MARIALUISA, FALCINI FERNANDA. Serum Osteopontin as a Predictive Marker of Responsiveness to Methotrexate in Juvenile Idiopathic Arthritis. J Rheumatol 2009; 36:2308-13. [DOI: 10.3899/jrheum.081156] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Objective.To evaluate if serum concentrations of osteopontin (OPN) at baseline in patients with juvenile idiopathic arthritis (JIA) represent a potential predictor of responsiveness to methotrexate (MTX).Methods.At diagnosis, 60 children with active JIA received MTX in addition to nonsteroidal antiinflammatory drugs. After 12 months of MTX treatment, 30 patients were defined as responders; the 30 nonresponders received anti-tumor necrosis factor-α therapy (etanercept) in addition to MTX; this group was then enrolled for an additional 12-month study period. No patient had received steroids within 6 weeks before entering the study. Fifty healthy children matched for sex and age acted as controls. OPN serum levels were measured at baseline, before MTX, and then at 6 and 12 months. In the nonresponder patients, OPN was evaluated again after 6 and 12 months of etanercept treatment.Results.At baseline, OPN values were significantly higher (p = 0.0003) in JIA patients than in controls, with no significant differences among the different JIA subtypes. At baseline, OPN levels were lower in responders than in nonresponder patients (14.16 ± 10.1 μg/ml vs 33.2 ± 18.1 μg/ml, respectively). After 12 months of MTX treatment, OPN levels were significantly reduced in comparison to baseline in both responder and nonresponder groups (p = 0.0017, p = 0.0048, respectively). In nonresponders, etanercept significantly reduced OPN levels at 6 and 12-month followup in comparison to baseline (p = 0.002, p = 0.008, respectively). No significant differences were found among OPN levels and disease activity.Conclusion.Serum levels of OPN at baseline represent a possible marker to predict the responsiveness to MTX in patients with JIA.
Collapse
|
37
|
Sennels HP, Sørensen S, Østergaard M, Knudsen LS, Hansen MS, Skjødt H, Peters ND, Colic A, Grau K, Jacobsen S. Circulating levels of osteopontin, osteoprotegerin, total soluble receptor activator of nuclear factor‐kappa B ligand, and high‐sensitivity C‐reactive protein in patients with active rheumatoid arthritis randomized to etanercept alone or in combination with methotrexate. Scand J Rheumatol 2009; 37:241-7. [DOI: 10.1080/03009740801910320] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
38
|
Sennels HP, Jacobsen S, Jensen T, Hansen MS, Ostergaard M, Nielsen HJ, Sørensen S. Biological variation and reference intervals for circulating osteopontin, osteoprotegerin, total soluble receptor activator of nuclear factor kappa B ligand and high‐sensitivity C‐reactive protein. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 67:821-35. [PMID: 17852826 DOI: 10.1080/00365510701432509] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVE Monitoring inflammatory diseases and osteoclastogenesis with osteopontin (OPN), osteoprotegerin (OPG), total soluble receptor activator of nuclear factor kappa B ligand (total sRANKL) and high-sensitivity C-reactive protein (hsCRP) has recently attracted increased interest. The purpose of our study was to determine reference intervals, variability caused by sampling time, biological variation and stability after repeated freeze-thaw cycles of circulating levels of OPN, OPG, total sRANKL and hsCRP. MATERIAL AND METHODS Plasma OPN and plasma OPG concentrations were determined with sandwich ELISA; serum total sRANKL concentration was determined using a two-site sandwich ELISA; and hsCRP was analysed by turbidimetry in 300 Danish blood donors (183 M and 117 F) with a median age of 43 years (range 18-64 years). Variability due to biological variation and sampling time was studied in serial samples from 38 healthy subjects. RESULTS The 95th percentiles in the donors were 76 microg/L for OPN, 4.2 pmol/L for OPG, 40.2 nmol/L for total sRANKL and 12 mg/L for hsCRP. The overall medians for both genders were 51 microg/L, 2.2 pmol/L, 0.66 nmol/L and 1.0 mg/L, respectively. We found a significant correlation between hsCRP and OPN (rho = 0.173; p<0.003). The biological within-subject variations were calculated to be 8.2 % for OPN, 8.8% for total sRANKL and 50% for hsCRP. CONCLUSIONS Reference intervals have been established with a high analytic performance for OPN and an acceptable analytic performance for OPG and total sRANKL. The study revealed low biological variation for OPN and total sRANKL and high biological variation for hsCRP.
Collapse
Affiliation(s)
- H P Sennels
- Department of Clinical Biochemistry, Hvidovre Hospital, Copenhagen University Hospital, Denmark.
| | | | | | | | | | | | | |
Collapse
|
39
|
Kanayama M, Kurotaki D, Morimoto J, Asano T, Matsui Y, Nakayama Y, Saito Y, Ito K, Kimura C, Iwasaki N, Suzuki K, Harada T, Li HM, Uehara J, Miyazaki T, Minami A, Kon S, Uede T. Alpha9 integrin and its ligands constitute critical joint microenvironments for development of autoimmune arthritis. THE JOURNAL OF IMMUNOLOGY 2009; 182:8015-25. [PMID: 19494327 DOI: 10.4049/jimmunol.0900725] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Osteopontin is critically involved in rheumatoid arthritis; however, the molecular cross-talk between osteopontin and joint cell components that leads to the inflammatory joint destruction is largely unknown. We found that not only osteopontin but also tenascin-C and their common receptor, alpha(9) integrin, are expressed at arthritic joints. The local production of osteopontin and tenascin-C is mainly due to synovial fibroblasts and, to a lesser extent, synovial macrophages. Synovial fibroblasts and macrophages express alpha(9) integrin, and autocrine and paracrine interactions of alpha(9) integrin on synovial fibroblasts and macrophages and its ligands contribute differently to the production of proinflammatory cytokines and chemokines. alpha(9) integrin is also involved in the recruitment and accumulation of inflammatory cells. Inhibition of alpha(9) integrin function with an anti-alpha(9) integrin Ab significantly reduces the production of arthrogenic cytokines and chemokines and ameliorates ongoing arthritis. Thus, we identified alpha(9) integrin as a critical intrinsic regulator that controls the development of autoimmune arthritis.
Collapse
Affiliation(s)
- Masashi Kanayama
- Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Hasegawa M, Nakoshi Y, Iino T, Sudo A, Segawa T, Maeda M, Yoshida T, Uchida A. Thrombin-cleaved osteopontin in synovial fluid of subjects with rheumatoid arthritis. J Rheumatol 2009; 36:240-5. [PMID: 19208558 DOI: 10.3899/jrheum.080753] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Osteopontin (OPN) is an extracellular matrix glycoprotein that has been recognized as a potential inflammatory cytokine. The function of OPN is modulated by protease digestion, and a thrombin-cleaved form of OPN is involved in the pathogenesis of various inflammatory disorders. We examined thrombin-cleaved OPN products in synovial fluid from patients with rheumatoid arthritis (RA) and osteoarthritis (OA). METHODS Synovial fluid samples were obtained from knees of 20 patients with RA and 111 patients with OA. Thrombin-cleaved OPN product was determined using Western blotting. Levels of thrombin- cleaved and full-length OPN in synovial fluid were determined by ELISA. Synovia were analyzed by immunohistochemistry using an antibody specific to the thrombin-cleaved form. RESULTS Immunoblotting showed the presence of thrombin-cleaved OPN in synovial fluid from patients with RA and OA. ELISA results showed no difference between concentrations of full-length OPN in the synovial fluid of RA and OA patients; however, thrombin-cleaved OPN concentrations in RA synovial fluid samples were roughly 30-fold higher compared with OA samples (p < 0.001). Synovial fluid concentrations of thrombin-cleaved OPN in RA did not correlate with C-reactive protein levels. Immunohistochemistry of the synovium showed stronger reactivity in RA than in OA samples. CONCLUSION Local generation of thrombin-cleaved OPN was increased in RA joints. Thrombin-cleaved OPN may be a useful biochemical marker of RA.
Collapse
Affiliation(s)
- Masahiro Hasegawa
- Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu City, Mie 514-8507, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
41
|
Choi ST, Kim JH, Kang EJ, Lee SW, Park MC, Park YB, Lee SK. Osteopontin might be involved in bone remodelling rather than in inflammation in ankylosing spondylitis. Rheumatology (Oxford) 2008; 47:1775-9. [DOI: 10.1093/rheumatology/ken385] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
|
42
|
Du J, Hou S, Zhong C, Lai Z, Yang H, Dai J, Zhang D, Wang H, Guo Y, Ding J. Molecular basis of recognition of human osteopontin by 23C3, a potential therapeutic antibody for treatment of rheumatoid arthritis. J Mol Biol 2008; 382:835-42. [PMID: 18694758 PMCID: PMC2793339 DOI: 10.1016/j.jmb.2008.07.075] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 07/14/2008] [Accepted: 07/25/2008] [Indexed: 11/25/2022]
Abstract
Osteopontin plays an important role in the development and perpetuation of rheumatoid arthritis (RA). Antibodies targeting osteopontin have shown promising therapeutic benefits against this disease. We have previously reported a novel anti-RA monoclonal antibody, namely, 23C3, and shown it capable of alleviating the symptoms of RA in a murine collagen-induced arthritis model, restoring the cytokine production profile in joint tissues, and reducing T-cell recall responses to collagen type II. We describe here the crystal structure of 23C3 in complex with its epitope peptide. Analyses of the complex structure reveal the molecular mechanism of osteopontin recognition by 23C3. The peptide folds into two tandem β-turns, and two key residues of the peptide are identified to be critical for the recognition by 23C3: TrpP43 is deeply embedded into a hydrophobic pocket formed by AlaL34, TyrL36, LeuL46, TyrL49, PheL91, and MetH102 and therefore has extensive hydrophobic interactions with 23C3, while AspP47 has a network of hydrophilic interactions with residues ArgH50, ArgH52, SerH53, and AsnH56 of the antibody. Besides the complementarity-determining region loops, the framework region L2 of 23C3 is also shown to interact with the epitope peptide, which is not common in the antibody–antigen interactions and thus could be exploited in the engineering of 23C3. These results not only provide valuable information for further improvement of 23C3 such as chimerization or humanization for its therapeutic application, but also reveal the features of this specific epitope of osteopontin that may be useful for the development of new antibody drugs against RA.
Collapse
Affiliation(s)
- Jiamu Du
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Fan K, Dai J, Wang H, Wei H, Cao Z, Hou S, Qian W, Wang H, Li B, Zhao J, Xu H, Yang C, Guo Y. Treatment of collagen‐induced arthritis with an anti‐osteopontin monoclonal antibody through promotion of apoptosis of both murine and human activated T cells. ACTA ACUST UNITED AC 2008; 58:2041-52. [DOI: 10.1002/art.23490] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
44
|
Sato I, Yamamoto N, Rittling SR, Denhardt DT, Hino M, Morimoro J, Sakai F, Fujie A, Uede T. Osteopontin is dispensable for protection against high load systemic fungal infection. Int Immunopharmacol 2008; 8:1441-8. [PMID: 18590834 DOI: 10.1016/j.intimp.2008.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Revised: 06/04/2008] [Accepted: 06/04/2008] [Indexed: 11/17/2022]
Abstract
Osteopontin (OPN) is a multi-functional cytokine which is involved in the pathogenesis of autoimmune disease. We previously reported that thrombin-cleaved form of OPN plays a pathogenic role in murine model of rheumatoid arthritis (RA) by using neutralizing antibody (M5) reacting against the cryptic epitope within OPN, exposed by thrombin cleavage of OPN. It has been shown that OPN-deficient mice are susceptible to various infections, demonstrating the protective role of OPN against various infectious diseases. However, it remains to be clarified whether and how OPN is involved in protection against systemic fungal infection. In a murine model of systemic fungal infection, OPN-deficient mice showed the increase in the susceptibility to low load, but not to high load fungal infection, indicating the protective of OPN against mild or severe forms of infections. However, mice treatment with M5 antibody did not alter the susceptibility to both high and low load fungal infection. These experiments suggest that in sharp contrast to the complete abrogation of OPN expression in OPN-deficient mice, the neutralization of OPN by antibody against thrombin-cleaved form of OPN does not interfere with the host defense against high and low load fungal infection. These findings suggest that the neutralizing antibody which is specific for the epitope of thrombin-cleaved OPN may become an attractive therapeutic means for the treatment of RA without interfering host defense system.
Collapse
Affiliation(s)
- Ikuko Sato
- Fermentation Research Laboratories, Astellas Pharmaceutical Inc., Tokodai 5-2-3, Tsukuba, Ibaraki, 300-2698, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Hayman AR. Tartrate-resistant acid phosphatase (TRAP) and the osteoclast/immune cell dichotomy. Autoimmunity 2008; 41:218-23. [PMID: 18365835 DOI: 10.1080/08916930701694667] [Citation(s) in RCA: 239] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Tartrate-resistant acid phosphatase (TRAP), once considered to be just a histochemical marker of osteoclasts is now recognised to be a molecule of widespread occurrence with functions in both the skeleton and the immune system. TRAP is expressed by osteoclasts, macrophages, dendritic cells and a number of other cell types. It has a critical role in many biological processes including skeletal development, collagen synthesis and degradation, the mineralisation of bone, cytokine production by macrophages and dendritic cells, macrophage recruitment, dendritic cell maturation and a role in the development of Th1 responses. TRAP is able to degrade skeletal phosphoproteins including osteopontin (OPN), identical to the T-cell cytokine, Eta-1. In this review, we discuss the role of TRAP in bone and immune cells and suggest that TRAP may be implicated in autoimmune disorders regulated by Th1 inflammatory responses as well as certain cancers.
Collapse
Affiliation(s)
- Alison R Hayman
- School of Clinical Veterinary Science, University of Bristol, Bristol, UK
| |
Collapse
|
46
|
[Toward a non-empirical treatment for rheumatoid arthritis based on its molecular pathology]. ACTA ACUST UNITED AC 2008; 4:19-31. [PMID: 21794490 DOI: 10.1016/s1699-258x(08)71791-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2007] [Accepted: 11/29/2007] [Indexed: 11/21/2022]
Abstract
Rheumatoid arthritis (RA) is a chronic, disabbling disease that affects individuals during the productive years of their lives. Modern treatment for RA includes the so called "biologic" therapy, which is based on recombinant proteins that modify the biologic processes. These agents have potent therapeutic effects and different mechanisms of action. Nevertheless, therapeutic failure still prevails. Treatment that prevents disability in RA must be started in an early manner, before the development of complications and, ideally, with a minimum possibility of therapeutic failure. As yet, there are no clinical or laboratory criteria to identify those patients with a higher probability of responding to particular types of therapy, delaying control of RA ad affecting the prevention of incapacity. Research into gene diversity through single-nucleotide polymorphisms (SNPs) by means of microarray systems, allows the detailed analysis of gene factors associated to a given disease. SNPs have been recently applied to the study of RA, where the major polymorphisms associated to RA occur primarily in genes that code for proteins related to the initiation of an immune response and/or the control of cellular activity in the immune system, in addition to genes related to tissue repair. The specific meaning of these findings is in its initial stages of research. On the other hand, proteomics relate to the analysis of protein expression profiles at multiple levels. Both types of studies will contribute to the knowledge of patterns of gene expression in RA compared to the general population, and will allow an understanding of the pathogenesis of RA. Moreover, proteomic and genomic profiles can be employed to designs probes that identify individuals with the risk of developing RA, individually predict the response to different therapeutic modalities (pharmacogenomics) and for the follow-up of the biologic response to therapy.
Collapse
|
47
|
Hashimoto M, Sun D, Rittling SR, Denhardt DT, Young W. Osteopontin-deficient mice exhibit less inflammation, greater tissue damage, and impaired locomotor recovery from spinal cord injury compared with wild-type controls. J Neurosci 2007; 27:3603-11. [PMID: 17392476 PMCID: PMC6672107 DOI: 10.1523/jneurosci.4805-06.2007] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Osteopontin (OPN) is expressed in many tissues during inflammatory responses. After spinal cord injury, microglia expresses OPN at the site of injury during the early to subacute stages. However, the function of OPN in spinal cord injury is not well understood. This study examines the responses of OPN knock-out (KO) and wild-type (WT) mice to spinal cord contusion injury. KO and WT mice were injured with a modified New York University impactor. Weights of 10 or 5.6 g were dropped 6.25 mm onto the T13 spinal cord under isoflurane anesthesia. At 24 h, homogenized spinal cords were analyzed for total potassium concentration to estimate lesion volumes. Expression of apoptotic genes, proinflammatory cytokines, and nerve growth factors was measured by reverse transcription (RT)-PCR and Western blot. In a series of animals, locomotor recovery was assessed with the Basso mouse scale (BMS) for 6 weeks, and histological analyses was performed to determine tissue preservation. Lesion volume showed no significant differences between KO and WT mice at 24 h. RT-PCR indicated that KO mice had significantly less Bcl-2, tumor necrosis factor-alpha, interleukin-1beta, and interleukin-6 mRNA compared with WT controls. Western blot also showed that KO had significantly less Bcl-2 7 d after spinal cord injury. KO mice had significantly worse BMS locomotor scores than WT at 6 weeks. KO mice also had a significantly reduced area of spared white matter and fewer neuronal-specific nuclear protein-positive neurons in the spinal cord surrounding the impact site. This result supports a potential neuroprotective role for OPN in the inflammatory response to spinal cord injury.
Collapse
Affiliation(s)
| | - Dongming Sun
- W. M. Keck Center for Collaborative Neuroscience and
- Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854, and
| | | | - David T. Denhardt
- Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854, and
| | - Wise Young
- W. M. Keck Center for Collaborative Neuroscience and
- Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, New Jersey 08854, and
| |
Collapse
|
48
|
Mix KS, Attur MG, Al-Mussawir H, Abramson SB, Brinckerhoff CE, Murphy EP. Transcriptional repression of matrix metalloproteinase gene expression by the orphan nuclear receptor NURR1 in cartilage. J Biol Chem 2007; 282:9492-9504. [PMID: 17283078 DOI: 10.1074/jbc.m608327200] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The NR4A orphan receptors (Nur77, NURR1, and NOR-1) are emerging as key regulators of cytokine and growth factor action in chronic inflammatory diseases. In this study, we address the role of these receptors in cartilage homeostasis during inflammatory joint disease. We document for the first time expression of the NR4A receptors in osteoarthritic cartilage. Relative to Nur77 and NOR-1, NURR1 is expressed at the highest level and correlates with cyclooxygenase-2 levels in cartilage. Consistent with this observation, cyclooxygenase-2-derived prostaglandin E(2) (PGE(2)) rapidly and potently induces NURR1 expression in chondrocytes, suggesting that this receptor may regulate PGE(2)-mediated processes in cartilage. We demonstrate that PGE(2) represses interleukin-1beta-induced matrix metalloproteinase (MMP)-1 and that transient overexpression of NURR1 is sufficient to antagonize expression of this gene. Furthermore, MMP-1 promoter activity is potently suppressed by NURR1, resulting in a significant reduction in endogenous MMP-1 mRNA and secreted pro-MMP-1 protein. In addition, NURR1 selectively antagonizes cytokine-induced MMP-3 and -9 expression with minimal effects on MMP-2 and -13 and tissue inhibitor of matrix metalloproteinases-1 and -2. To explore the molecular mechanisms of NURR1 transrepression, we reveal that this receptor targets a critical region of the MMP-1 promoter (-1772 to -1546 bp) and that repression does not require consensus binding sites for NURR1. We confirm that NURR1 targets a 40-bp promoter sequence that is also positively regulated by ETS transcription factors. Finally, functional studies indicate that transcriptional antagonism exists between NURR1 and ETS1 on the MMP-1 promoter. We propose a protective function for NURR1 in cartilage homeostasis by selectively repressing MMP gene expression during inflammation.
Collapse
Affiliation(s)
- Kimberlee S Mix
- College of Life Sciences, Veterinary Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Mukundan G Attur
- Division of Rheumatology, New York University Hospital for Joint Diseases, New York, New York 10003
| | - Hayf Al-Mussawir
- Division of Rheumatology, New York University Hospital for Joint Diseases, New York, New York 10003
| | - Steven B Abramson
- Division of Rheumatology, New York University Hospital for Joint Diseases, New York, New York 10003
| | | | - Evelyn P Murphy
- College of Life Sciences, Veterinary Sciences Centre, University College Dublin, Belfield, Dublin 4, Ireland
| |
Collapse
|
49
|
Esfandiari E, Bailey M, Stokes CR, Cox TM, Evans MJ, Hayman AR. TRACP Influences Th1 pathways by affecting dendritic cell function. J Bone Miner Res 2006; 21:1367-76. [PMID: 16939395 DOI: 10.1359/jbmr.060611] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
UNLABELLED TRACP, a marker of osteoclasts, is also expressed by cells of the immune system. We identified a novel function for TRACP in the dendritic cell. DCs from TRACP knockout mice have impaired maturation and trigger reduced Th1 responses in vivo. We postulate that TRACP has an important role in the presentation of antigens to T cells. INTRODUCTION TRACP is highly expressed by osteoclasts, activated macrophages, and dendritic cells (DCs). Knockout mice lacking TRACP have an intrinsic defect in osteoclastic resorption and macrophages that display abnormal immunomodulatory responses and cytokine secretion profiles. Our aim in this study was to investigate the significance of TRACP in the inductive phase of the immune response by examining dendritic cells from TRACP(-/-) mice. MATERIALS AND METHODS Maturational state and function of leukocyte subsets in mice was assessed by flow cytometry. The ability of the immune system to respond to nonspecific activation and to specific antigen was assessed by delayed type hypersensitivity and the presence of isotype-specific serum antibody in vivo and T-cell proliferation and cytokine production in vitro. RESULTS The ability of lipopolysaccharide (LPS) to upregulate MHC II and CD80 in DCs from TRACP(-/-) mice was reduced compared with wildtype mice, although production of IL-10 by DCs from TRACP-deficient animals was increased. T- and B-cell responses not involving antigen presentation (anti-CD3, TNP-ficoll) were normal in TRACP(-/-) mice, but responses to T-dependent antigens were impaired. Specifically, TRACP(-/-) mice had defective delayed hypersensitivity responses to picryl chloride and reduced proliferative responses to ovalbumin compared with wildtype mice. In response to ovalbumin, but not anti-CD3, T cells from TRACP(-/-) mice produced less interferon-gamma (IFN-gamma), but there was no difference in IL-4 production: TRACP(-/-) mice also produced less ovalbumin (OVA)-specific IgG2a after immunization. CONCLUSIONS The finding that DCs from TRACP(-/-) mice have impaired maturation and defective Th1 responses shows that TRACP is important for polarizing responses in naïve T cells to antigen-presented dendritic cells.
Collapse
Affiliation(s)
- Ehsanollah Esfandiari
- School of Clinical Veterinary Science, University of Bristol, Bristol, United Kingdom
| | | | | | | | | | | |
Collapse
|
50
|
Marciano R, Giacopelli F, Divizia MT, Gattorno M, Felici E, Pistorio A, Martini A, Ravazzolo R, Picco P. A polymorphic variant inside the osteopontin gene shows association with disease course in oligoarticular juvenile idiopathic arthritis. Ann Rheum Dis 2005; 65:662-5. [PMID: 16150788 PMCID: PMC1798121 DOI: 10.1136/ard.2005.040626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Oligoarticular onset juvenile idiopathic arthritis (JIA) has a variable disease course. In some patients the disease remains confined to a few joints (persistent oligoarticular) while in others it extends to affect more joints (oligoarticular extended). Osteopontin is thought to play a role in the pathogenesis. OBJECTIVE To investigate whether a polymorphic variant in the human osteopontin gene, which is in linkage disequilibrium with recently characterised promoter variants, is associated with the disease course in oligoarticular JIA. METHODS Genotyping of the two base pair insertion/deletion variant at +245 in the first intron was undertaken by polymerase chain reaction (PCR) amplification of DNA fragments, using a fluorescently labelled primer, followed by allele detection after rapid separation of PCR products on an automated DNA sequencer. RESULTS Allele 2 of the polymorphic variant in the osteopontin first intron was significantly associated with the persistent oligoarticular form rather than the extended form of JIA. This was verified at the level of genotype and allele frequencies. CONCLUSIONS The results suggest that osteopontin gene polymorphism is associated with the disease course in oligoarticular JIA and might therefore represent a useful genetic marker to characterise patients with oligoarticular JIA who are at risk of a worse outcome.
Collapse
Affiliation(s)
- R Marciano
- Laboratory of Molecular Genetics, G Gaslini Institute, Largo G Gaslini 5, 16147 Genova, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|