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Chen Y, Bai P, Liu L, Han J, Zeng H, Sun Y. Increased RANKL expression in peripheral T cells is associated with decreased bone mineral density in patients with COPD. Int J Mol Med 2016; 38:585-93. [PMID: 27279356 DOI: 10.3892/ijmm.2016.2629] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 05/20/2016] [Indexed: 11/05/2022] Open
Abstract
Receptor activator of nuclear factor-κB ligand (RANKL)-expressing adaptive T cells contribute to bone damage in autoimmune arthritis, although their role in chronic obstructive pulmonary disease (COPD)-associated osteoporosis is unknown. In the present study, the functional expression of RANKL in CD4+/CD8+ T cells and Th17 cells, and the potential role of these cells in COPD-associated bone loss was investigated. A total of 36 non-smokers, 38 smokers with normal lung function and 57 patients with COPD were enrolled. Femoral and vertebral bone mineral density (BMD) was assessed by dual energy X-ray absorptiometry. RANKL expression in peripheral CD4+ and CD8+ T cells and Th17 cells was evaluated by flow cytometry. For in vitro experiments, CD4+ and CD8+ T cells from 17 non-smokers were evaluated for RANKL expression following dose-dependent culture with cigarette smoke extract (CSE) for 5 days. The frequencies of RANKL-positive CD4+ and CD8+ T cells were higher in the patients with COPD than in the non-smokers (P=0.001 and P=0.002, respectively). The proportion of CD4+ T cells positive for both RANKL and interleukin-17 (IL-17) was higher in the patients with COPD than in the non-smokers (P=0.010). However, the frequency of RANKL-expressing Th17 cells was similar among all groups (P=0.508). The frequency of RANKL+CD4+ T cells inversely correlated with BMD of the lumbar vertebrae (P=0.01, r=-0.229), and that of the femoral neck (P<0.001, r=-0.350). The results of our in vitro experiments revealed that CSE increased RANKL expression in CD4+ T cells only. The percentages of RANKL-positive CD4+ T cells and RANKL- and IL-17 double-positive CD4+ T cells were increased in the peripheral blood of patients with COPD, and the former were associated with BMD. These observations suggest that RANKL+CD4+ T cells may be mechanistically linked to diseases of the lung and bone in patients with COPD.
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Affiliation(s)
- Ying Chen
- Department of Respiratory Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, P.R. China
| | - Peng Bai
- Department of Respiratory Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, P.R. China
| | - Lili Liu
- Department of Respiratory Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, P.R. China
| | - Junyan Han
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, P.R. China
| | - Hui Zeng
- Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, P.R. China
| | - Yongchang Sun
- Department of Respiratory Medicine, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, P.R. China
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Pesce Viglietti AI, Arriola Benitez PC, Giambartolomei GH, Delpino MV. Brucella abortus-infected B cells induce osteoclastogenesis. Microbes Infect 2016; 18:529-35. [PMID: 27109230 DOI: 10.1016/j.micinf.2016.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Revised: 03/07/2016] [Accepted: 04/13/2016] [Indexed: 01/18/2023]
Abstract
Brucella abortus is an intracellular bacterium that establishes lifelong infections in livestock and humans although the mechanisms of its chronicity are poorly understood. Activated B cells have long lifespan and B. abortus infection activates B cells. Our results indicate that the direct infection of B cells with B. abortus induced matrix metalloproteinase-9 (MMP-9), receptor activator for NF κB ligand (RANKL), tumor necrosis factor (TNF)-α and interleukin (IL)-6 secretion. In addition, supernatants from B. abortus-infected B cells induced bone marrow-derived monocytes to undergo osteoclastogenesis. Using osteoprotegerin, RANKL's decoy receptor, we determined that RANKL is involved in osteoclastogenesis induced by supernatants from B. abortus-infected B cells. The results presented here shed light on how the interactions of B. abortus with B cells may have a role in the pathogenesis of brucellar osteoarticular disease.
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Affiliation(s)
- Ayelén Ivana Pesce Viglietti
- Instituto de Inmunología, Genética y Metabolismo (INIGEM), Hospital de Clínicas "José de San Martín", Facultad de Medicina, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Paula Constanza Arriola Benitez
- Instituto de Inmunología, Genética y Metabolismo (INIGEM), Hospital de Clínicas "José de San Martín", Facultad de Medicina, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Guillermo Hernán Giambartolomei
- Instituto de Inmunología, Genética y Metabolismo (INIGEM), Hospital de Clínicas "José de San Martín", Facultad de Medicina, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - María Victoria Delpino
- Instituto de Inmunología, Genética y Metabolismo (INIGEM), Hospital de Clínicas "José de San Martín", Facultad de Medicina, CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
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53
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Trauma-induced heterotopic bone formation and the role of the immune system: A review. J Trauma Acute Care Surg 2016; 80:156-65. [PMID: 26491794 DOI: 10.1097/ta.0000000000000883] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Extremity trauma, spinal cord injuries, head injuries, and burn injuries place patients at high risk of pathologic extraskeletal bone formation. This heterotopic bone causes severe pain, deformities, and joint contractures. The immune system has been increasingly implicated in this debilitating condition. This review summarizes the various roles immune cells and inflammation play in the formation of ectopic bone and highlights potential areas of future investigation and treatment. Cell types in both the innate and adaptive immune system such as neutrophils, macrophages, mast cells, B cells, and T cells have all been implicated as having a role in ectopic bone formation through various mechanisms. Many of these cell types are promising areas of therapeutic investigation for potential treatment. The immune system has also been known to also influence osteoclastogenesis, which is heavily involved in ectopic bone formation. Chronic inflammation is also known to have an inhibitory role in the formation of ectopic bone, whereas acute inflammation is necessary for ectopic bone formation.
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54
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Wang WH, Chuang HY, Chen CH, Chen WK, Hwang JJ. Lupeol acetate ameliorates collagen-induced arthritis and osteoclastogenesis of mice through improvement of microenvironment. Biomed Pharmacother 2016; 79:231-40. [PMID: 27044833 DOI: 10.1016/j.biopha.2016.02.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 02/23/2016] [Accepted: 02/23/2016] [Indexed: 10/22/2022] Open
Abstract
Lupeol has been shown with anti-inflammation and antitumor capability, however, the poor bioavailability limiting its applications in living subjects. Lupeol acetate (LA), a derivative of lupeol, shows similar biological activities as lupeol but with better bioavailability. Here RAW 264.7 cells and bone marrow-derived macrophages (BMDMs) stimulated by lipopolysaccharide (LPS) were treated with 0-80μM of LA, and assayed for TNF-α, IL-1β, COX-2, MCP-1 using Western blotting. Moreover, osteoclatogenesis was examined with reverse transcription PCR (RT-PCR) and tartrate-resistant acid phosphatase (TRAP) staining. For in vivo study, collagen-induced arthritis (CIA)-bearing DBA/1J mice were randomly separated into three groups: vehicle, LA-treated (50mg/kg) and curcumin-treated (100mg/kg). Therapeutic efficacies were assayed by the clinical score, expression levels of serum cytokines including TNF-α and IL-1β, (18)F-fluorodeoxyglucose ((18)F-FDG) microPET/CT and histopathology. The results showed that LA could inhibit the activation, migration, and formation of osteoclastogenesis of macrophages in a dose-dependent manner. In RA-bearing mice, the expressions of inflammation-related cytokines were suppressed, and clinical symptoms and bone erosion were ameliorated by LA. The accumulation of (18)F-FDG in the joints of RA-bearing mice was also significantly decreased by LA. The results indicate that LA significantly improves the symptoms of RA by down-regulating expressions of inflammatory cytokines and osteoclastogenesis.
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Affiliation(s)
- Wei-Hsun Wang
- Dept of Orthopedic Surgery, Changhua Christian Hospital, Changhua, Taiwan
| | - Hui-Yen Chuang
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
| | - Chien-Hui Chen
- Department of Radiation Oncology, Chang-Gung Memorial Hospital, Taoyen, Taiwan
| | - Wun-Ke Chen
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan; Department of Radiation Oncology, Hsinchu Branch, Mackay Memorial Hospital, Hsinchu, Taiwan
| | - Jeng-Jong Hwang
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan; Biophotonics & Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei, Taiwan.
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Nagarajan R, Miller CS, Dawson D, Al-Sabbagh M, Ebersole JL. Patient-Specific Variations in Biomarkers across Gingivitis and Periodontitis. PLoS One 2015; 10:e0136792. [PMID: 26407063 PMCID: PMC4583448 DOI: 10.1371/journal.pone.0136792] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 08/08/2015] [Indexed: 12/31/2022] Open
Abstract
This study investigates the use of saliva, as an emerging diagnostic fluid in conjunction with classification techniques to discern biological heterogeneity in clinically labelled gingivitis and periodontitis subjects (80 subjects; 40/group) A battery of classification techniques were investigated as traditional single classifier systems as well as within a novel selective voting ensemble classification approach (SVA) framework. Unlike traditional single classifiers, SVA is shown to reveal patient-specific variations within disease groups, which may be important for identifying proclivity to disease progression or disease stability. Salivary expression profiles of IL-1ß, IL-6, MMP-8, and MIP-1α from 80 patients were analyzed using four classification algorithms (LDA: Linear Discriminant Analysis [LDA], Quadratic Discriminant Analysis [QDA], Naïve Bayes Classifier [NBC] and Support Vector Machines [SVM]) as traditional single classifiers and within the SVA framework (SVA-LDA, SVA-QDA, SVA-NB and SVA-SVM). Our findings demonstrate that performance measures (sensitivity, specificity and accuracy) of traditional classification as single classifier were comparable to that of the SVA counterparts using clinical labels of the samples as ground truth. However, unlike traditional single classifier approaches, the normalized ensemble vote-counts from SVA revealed varying proclivity of the subjects for each of the disease groups. More importantly, the SVA identified a subset of gingivitis and periodontitis samples that demonstrated a biological proclivity commensurate with the other clinical group. This subset was confirmed across SVA-LDA, SVA-QDA, SVA-NB and SVA-SVM. Heatmap visualization of their ensemble sets revealed lack of consensus between these subsets and the rest of the samples within the respective disease groups indicating the unique nature of the patients in these subsets. While the source of variation is not known, the results presented clearly elucidate the need for novel approaches that accommodate inherent heterogeneity and personalized variations within disease groups in diagnostic characterization. The proposed approach falls within the scope of P4 medicine (predictive, preventive, personalized, and participatory) with the ability to identify unique patient profiles that may predict specific disease trajectories and targeted disease management.
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Affiliation(s)
- Radhakrishnan Nagarajan
- Division of Biomedical Informatics, Department of Biostatistics, College of Public Health, University of Kentucky, Lexington, KY, United States of America
| | - Craig S. Miller
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
- Division of Oral Medicine, Department of Oral Health Practice, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
| | - Dolph Dawson
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
- Division of Periodontics, Department of Oral Health Practice, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
| | - Mohanad Al-Sabbagh
- Division of Periodontics, Department of Oral Health Practice, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
| | - Jeffrey L. Ebersole
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, United States of America
- * E-mail:
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56
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Choi SW, Lee SU, Kim EH, Park SJ, Choi I, Kim TD, Kim SH. Osteoporotic bone of miR-150-deficient mice: Possibly due to low serum OPG-mediated osteoclast activation. Bone Rep 2015; 3:5-10. [PMID: 28377961 PMCID: PMC5365209 DOI: 10.1016/j.bonr.2015.06.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/26/2015] [Accepted: 06/22/2015] [Indexed: 12/17/2022] Open
Abstract
MicroRNA (miR)-150 has been shown to control B and T cell differentiation in the bone marrow. The regulation of B and T cells is directly or systematically associated with bone remodeling cells such as osteoclasts; however, the functional role of miR-150 in bone homeostasis has not been well studied. Here, we observed down-regulation of miR-150 during in vitro osteoclast differentiation and, furthermore, that miR-150 knockout mice exhibit decreased bone mass and an increased number of osteoclasts. miR-150 deficiency did not affect osteoclast differentiation, but miR150 knockout mice had significantly lower osteoprotegrin (OPG) serum levels, suggesting that the reduction of serum OPG level in miR-150 knockout mice might induce B cell expansion and subsequently increase serum levels of immunoglobulins for activating osteoclast differentiation. miR-150 knockout mice exhibited decreased bone mass and an increased number of osteoclasts. miR-150 expression gradually decreased during in vitro osteoclast differentiation. Osteoclast differentiation of BMMs isolated from miR-150 knockout mice was similar to that from wild type. miR-150 knockout mice exhibited significantly lower OPG serum levels.
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Key Words
- BMC, bone marrow cell
- BMD, bone mineral density
- BMMs, bone marrow-derived macrophages
- BV/TV, bone volume/tissue volume
- Bone
- IFN, interferon
- Ig, immunoglobulin
- M-CSF, macrophage-colony-stimulating factor
- MNCs, multinucleated osteoclast cells
- NK, natural killer
- OPG, osteoprotegrin
- Osteoclasts
- Osteoporosis
- Osteoprotegrin
- RANKL, receptor activator of nuclear factor-kB ligand
- TNF, tumor necrosis factor
- TRAP, tartrate-resistant acid phosphatase
- Tb.N, number of trabeculae
- Tb.Sp, trabecular separation
- iNKT, invariant NK T cell
- miR-150
- miRNA, microRNA
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Affiliation(s)
- Sik-Won Choi
- Laboratory of Translational Therapeutics, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
| | - Su Ui Lee
- Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju-si, Chungbuk 363-883, Republic of Korea
| | - Eun Hye Kim
- Laboratory of Translational Therapeutics, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
| | - Sang-Joon Park
- Department of Histology, College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Inpyo Choi
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea; Department of Functional Genomics, Korea University of Science and Technology, Daejeon 305-333, Republic of Korea
| | - Tae-Don Kim
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea; Department of Functional Genomics, Korea University of Science and Technology, Daejeon 305-333, Republic of Korea
| | - Seong Hwan Kim
- Laboratory of Translational Therapeutics, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
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57
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Johnsson M, Jonsson KB, Andersson L, Jensen P, Wright D. Genetic regulation of bone metabolism in the chicken: similarities and differences to Mammalian systems. PLoS Genet 2015; 11:e1005250. [PMID: 26023928 PMCID: PMC4449198 DOI: 10.1371/journal.pgen.1005250] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 04/28/2015] [Indexed: 11/19/2022] Open
Abstract
Birds have a unique bone physiology, due to the demands placed on them through egg production. In particular their medullary bone serves as a source of calcium for eggshell production during lay and undergoes continuous and rapid remodelling. We take advantage of the fact that bone traits have diverged massively during chicken domestication to map the genetic basis of bone metabolism in the chicken. We performed a quantitative trait locus (QTL) and expression QTL (eQTL) mapping study in an advanced intercross based on Red Junglefowl (the wild progenitor of the modern domestic chicken) and White Leghorn chickens. We measured femoral bone traits in 456 chickens by peripheral computerised tomography and femoral gene expression in a subset of 125 females from the cross with microarrays. This resulted in 25 loci for female bone traits, 26 loci for male bone traits and 6318 local eQTL loci. We then overlapped bone and gene expression loci, before checking for an association between gene expression and trait values to identify candidate quantitative trait genes for bone traits. A handful of our candidates have been previously associated with bone traits in mice, but our results also implicate unexpected and largely unknown genes in bone metabolism. In summary, by utilising the unique bone metabolism of an avian species, we have identified a number of candidate genes affecting bone allocation and metabolism. These findings can have ramifications not only for the understanding of bone metabolism genetics in general, but could also be used as a potential model for osteoporosis as well as revealing new aspects of vertebrate bone regulation or features that distinguish avian and mammalian bone. In this work we seek to further the understanding of bone genetics by mapping bone traits and gene expression in the chicken. Bone in female birds is special due to egg production. In this study, we combine the genetic mapping of bone traits with bone gene expression to find candidate quantitative trait genes that explain the differences between wild and domestic chickens in terms of bone production. The concept of combining genetic mapping and gene expression mapping is not new, and has already been successful in isolating bone-related genes in mammals, however this is the first time it has been applied to an avian system with such unique bone modelling processes. We aim to reveal new molecular mechanisms of bone regulation, and many of the candidates we find are new, highlighting the potential this technique has to identify the potential differences between avian and mammalian bone biology.
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Affiliation(s)
- Martin Johnsson
- AVIAN Behavioural Genomics and Physiology group, IFM Biology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Kenneth B. Jonsson
- Department of Surgical Sciences, Orthopaedics, Akademiska Sjukhuset, Uppsala University, Uppsala, Sweden
| | - Leif Andersson
- Department of Medical Biochemistry and Microbiology, BMC, Uppsala University, Uppsala, Sweden
| | - Per Jensen
- AVIAN Behavioural Genomics and Physiology group, IFM Biology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Dominic Wright
- AVIAN Behavioural Genomics and Physiology group, IFM Biology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
- * E-mail:
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58
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Poli C, Martin JC, Braudeau C, Bériou G, Hémont C, Charrier C, Guérin S, Heslan M, Josien R. Receptor activating NF-κB ligand (RANKL) is a constitutive intracellular protein in resting human basophils and is strongly induced on their surface by interleukin 3. Immunobiology 2015; 220:692-700. [DOI: 10.1016/j.imbio.2014.11.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 11/10/2014] [Indexed: 12/26/2022]
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59
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Liu WX, Li ZJ, Niu XL, Yao Z, Deng WM. The Role of T Helper 17 Cells and Other IL-17-Producing Cells in Bone Resorption and Remodeling. Int Rev Immunol 2015; 34:332-47. [DOI: 10.3109/08830185.2014.952414] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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60
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Li Y, Terauchi M, Vikulina T, Roser-Page S, Weitzmann MN. B Cell Production of Both OPG and RANKL is Significantly Increased in Aged Mice. ACTA ACUST UNITED AC 2015; 6:8-17. [PMID: 25984250 PMCID: PMC4429037 DOI: 10.2174/1876525401406010008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aging is a risk factor for osteoclastic bone loss and bone fracture. Receptor activator of NF-κB ligand (RANKL) is the key effector cytokine for osteoclastogenesis and bone resorption, and is moderated by its decoy receptor osteoprotegerin (OPG). The development of an inflammatory environment during aging leads to increased bone resorption and loss of bone mineral density (BMD). Interestingly, animal and clinical studies show that OPG is actually increased in aging but fails to fully compensate for endogenous RANKL. Osteoblast- and B-lineage cells are significant sources of physiological OPG, however osteoblast OPG production declines with age, suggesting that elevated OPG in aging may be a consequence of changes in B cell function. In this study we examined BMD and indices of trabecular bone structure during aging, and B cell production of both RANKL and OPG in young and aged mice. Our data reveal significant loss of BMD and trabecular structure with age commensurate with significantly elevated concentrations of both OPG and RANKL in aged mice, and a decline in B cell populations in aged animals. Taken together our data suggest that B cells may be responsible for the elevated concentrations of OPG during aging and are essential to counteract excessive age-associated bone resorption. Paradoxically, B cells themselves likely contribute RANKL in aging and the loss of B cells with age may further contribute to the imbalance in OPG relative to RANKL that predisposes age-associated bone loss.
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Affiliation(s)
- Yan Li
- Division of Endocrinology and Metabolism and Lipids, Department of Medicine, Emory University School of Medicine, Atlanta, GA, 30322, USA ; Emory Winship Cancer Institute, Emory University, Atlanta, GA, 30322, USA
| | - Masakazu Terauchi
- Division of Endocrinology and Metabolism and Lipids, Department of Medicine, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Tatyana Vikulina
- Division of Endocrinology and Metabolism and Lipids, Department of Medicine, Emory University School of Medicine, Atlanta, GA, 30322, USA
| | - Susanne Roser-Page
- Atlanta Department of Veterans Affairs Medical Center, Decatur, Georgia 30033, USA
| | - M N Weitzmann
- Division of Endocrinology and Metabolism and Lipids, Department of Medicine, Emory University School of Medicine, Atlanta, GA, 30322, USA ; Emory Winship Cancer Institute, Emory University, Atlanta, GA, 30322, USA ; Atlanta Department of Veterans Affairs Medical Center, Decatur, Georgia 30033, USA
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61
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Yu X, Lin J, Yu Q, Kawai T, Taubman MA, Han X. Activation of Toll‐like receptor 9 inhibits lipopolysaccharide‐induced receptor activator of nuclear factor kappa‐ B ligand expression in rat B lymphocytes. Microbiol Immunol 2014; 58:51-60. [PMID: 24661200 DOI: 10.1111/1348-0421.12129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
B lymphocytes express multiple TLRs that regulate their cytokine production.We investigated the effect of TLR4 and TLR9 activation on receptor activator of NF‐kB ligand (RANKL) expression by rat spleen B cells. Splenocytes or purified spleen B cells from Rowett rats were cultured with TLR4 ligand Escherichia coli LPS and/or TLR9 ligand CpG‐oligodeoxynucleotide (CpG‐ODN) for 2 days. RANKL mRNA expression and the percentage of RANKL‐positive B cells were increased in rat splenocytes challenged by E. coli LPS alone. The increases were less pronounced when cells were treated with both CpG‐ODN and E. coli LPS. Microarray analysis showed that expressions of multiple cyclin‐dependent kinase (CDK) pathway‐related genes were up‐regulated only in cells treated with both E. coli LPS and CpG-ODN. This study suggests that CpG‐ODN inhibits LPS‐induced RANKL expression in rat B cells via regulation of the CDK pathway.
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62
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Xiong J, Piemontese M, Thostenson JD, Weinstein RS, Manolagas SC, O'Brien CA. Osteocyte-derived RANKL is a critical mediator of the increased bone resorption caused by dietary calcium deficiency. Bone 2014; 66:146-54. [PMID: 24933342 PMCID: PMC4125539 DOI: 10.1016/j.bone.2014.06.006] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 06/03/2014] [Accepted: 06/04/2014] [Indexed: 11/23/2022]
Abstract
Parathyroid hormone (PTH) excess stimulates bone resorption. This effect is associated with increased expression of the osteoclastogenic cytokine receptor activator of nuclear factor κB ligand (RANKL) in bone. However, several different cell types, including bone marrow stromal cells, osteocytes, and T lymphocytes, express both RANKL and the PTH receptor and it is unclear whether RANKL expression by any of these cell types is required for PTH-induced bone loss. Here we have used mice lacking the RANKL gene in osteocytes to determine whether RANKL produced by this cell type is required for the bone loss caused by secondary hyperparathyroidism induced by dietary calcium deficiency in adult mice. Thirty days of dietary calcium deficiency caused bone loss in control mice, but this effect was blunted in mice lacking RANKL in osteocytes. The increase in RANKL expression in bone and the increase in osteoclast number caused by dietary calcium deficiency were also blunted in mice lacking RANKL in osteocytes. These results demonstrate that RANKL produced by osteocytes contributes to the increased bone resorption and the bone loss caused by secondary hyperparathyroidism, strengthening the evidence that osteocytes are an important target cell for hormonal control of bone remodeling.
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Affiliation(s)
- Jinhu Xiong
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Marilina Piemontese
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Jeff D Thostenson
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Robert S Weinstein
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Stavros C Manolagas
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System, Little Rock, AR, USA
| | - Charles A O'Brien
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, Little Rock, AR, USA; Central Arkansas Veterans Healthcare System, Little Rock, AR, USA.
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63
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Manilay JO, Zouali M. Tight relationships between B lymphocytes and the skeletal system. Trends Mol Med 2014; 20:405-12. [DOI: 10.1016/j.molmed.2014.03.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 03/06/2014] [Accepted: 03/13/2014] [Indexed: 02/06/2023]
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64
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Effects of Yishenjiangzhuo granules on immunity and bone metabolism in patients with stage 3-4 chronic kidney disease. J TRADIT CHIN MED 2014; 33:620-5. [PMID: 24660585 DOI: 10.1016/s0254-6272(14)60031-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OBJECTIVE To determine the effects of Yishenjiangzhuo granules (YJG) on bone metabolism and to explore the changes in levels of bone Gla protein (BGP), tartrate-resistant acid phosphatase (TRAP), as well as their relationships with levels of B cells, regulatory T cells (Treg) and interleukin (IL)-17 in patients with stage 3-4 chronic kidney disease (CKD) before and after treatment. METHODS Fifty-three stage 3-4 CKD patients were divided randomly into two groups: YJG treatment and control. Peripheral blood was taken from two groups of CKD patients and 21 healthy subjects in the normal group. The parameters determined were the levels of CD4+, CD19+, CD19+ CD69+, CD19+ av, Treg (CD4 + CD25 + CD127lo), BGP, TRAP, IL-17, calcium, phosphate, blood urea nitrogen, serum creatinine (SCr), hemoglobin (Hb) in peripheral blood, and urinary creatinine. Calcium-phosphate products and endogenous creatinine clearance rate (CCr) were calculated according to standard protocols. RESULTS In YJG and control groups, SCr levels were lowered (P < 0.01) after treatment, whereas CCr (P < 0.05) as well as Hb and albumin levels (P < 0.01) were increased. The changes in levels of CCr and SCr in the YJG group were more significant. After treatment, CD19+CD69+ and Treg levels in the two groups varied (P < 0.01) compared with those of the normal group; the level of CD19+ increased but the levels of CD4+ and CD19 + AV decreased (P < 0.01) in both groups. Compared with the control group, the changes of CD19+ and CD19 + AV in the YJG group were more apparent (P < 0.05). Compared with the normal group, levels of IL-17 in both groups increased significantly (P < 0.01), and the difference in the control group was more significant (P < 0.05). After treatment, the TRAP level increased (P < 0.05), but the difference in BGP level (P > 0.05) was not significant. CONCLUSION In stage 3-4 CKD patients, B cells and IL-17 participated in the induction of osteoclast activation. YJG could also elevate the level of B cells and decrease their apoptosis, but showed no significant effects on active B cells, IL-17 or osteoclast activity.
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OX40L blockade is therapeutic in arthritis, despite promoting osteoclastogenesis. Proc Natl Acad Sci U S A 2014; 111:2289-94. [PMID: 24469824 DOI: 10.1073/pnas.1321071111] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
An immune response is essential for protection against infection, but, in many individuals, aberrant responses against self tissues cause autoimmune diseases such as rheumatoid arthritis (RA). How to diminish the autoimmune response while not augmenting infectious risk is a challenge. Modern targeted therapies such as anti-TNF or anti-CD20 antibodies ameliorate disease, but at the cost of some increase in infectious risk. Approaches that might specifically reduce autoimmunity and tissue damage without infectious risk would be important. Here we describe that TNF superfamily member OX40 ligand (OX40L; CD252), which is expressed predominantly on antigen-presenting cells, and its receptor OX40 (on activated T cells), are restricted to the inflamed joint in arthritis in mice with collagen-induced arthritis and humans with RA. Blockade of this pathway in arthritic mice reduced inflammation and restored tissue integrity predominantly by inhibiting inflammatory cytokine production by OX40L-expressing macrophages. Furthermore, we identify a previously unknown role for OX40L in steady-state bone homeostasis. This work shows that more targeted approaches may augment the "therapeutic window" and increase the benefit/risk in RA, and possibly other autoimmune diseases, and are thus worth testing in humans.
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Yu X, Lin J, Yu Q, Kawai T, Taubman MA, Han X. Activation of Toll-like receptor 9 inhibits lipopolysaccharide-induced receptor activator of nuclear factor kappa- B ligand expression in rat B lymphocytes. Microbiol Immunol 2014. [DOI: 10.1111/1348-0421.12115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaoqian Yu
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
- Department of Periodontology; Peking University School and Hospital of Stomatology; 22 Zhong-Guan-Cun South Avenue Beijing 100081
| | - Jiang Lin
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
- Department of Stomatology; Fourth Hospital of Harbin Medical University; 37 Yinhang Street Harbin 150001 China
| | - Qing Yu
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
| | - Toshihisa Kawai
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
| | - Martin A. Taubman
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
| | - Xiaozhe Han
- Department of Immunology and Infectious Diseases; The Forsyth Institute; 245 First Street Cambridge Massachusetts 02142 USA
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Faienza MF, Ventura A, Piacente L, Ciccarelli M, Gigante M, Gesualdo L, Colucci S, Cavallo L, Grano M, Brunetti G. Osteoclastogenic potential of peripheral blood mononuclear cells in cleidocranial dysplasia. Int J Med Sci 2014; 11:356-64. [PMID: 24578613 PMCID: PMC3936030 DOI: 10.7150/ijms.7793] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 01/10/2014] [Indexed: 12/29/2022] Open
Abstract
Cleidocranial dysplasia (CCD) is an autosomal dominant skeletal dysplasia characterized by hypoplastic or aplastic clavicles, dental abnormalities, and delayed closure of the cranial sutures. In addition, mid-face hypoplasia, short stature, skeletal anomalies and osteoporosis are common. We aimed to evaluate osteoclastogenesis in a child (4 years old), who presented with clinical signs of CCD and who have been diagnosed as affected by deletion of RUNX2, master gene in osteoblast differentiation, but also affecting T cell development and indirectly osteoclastogenesis. The results of this study may help to understand whether in this disease is present an alteration in the bone-resorptive cells, the osteoclasts (OCs). Unfractionated and T cell-depleted Peripheral Blood Mononuclear Cells (PBMCs) from patient were cultured in presence/absence of recombinant human M-CSF and RANKL. At the end of the culture period, OCs only developed following the addition of M-CSF and RANKL. Moreover, real-time PCR experiment showed that freshly isolated T cells expressed the osteoclastogenic cytokines (RANKL and TNFα) at very low level, as in controls. This is in accordance with results arising from flow cytometry experiments demonstrating an high percentage of circulating CD4(+)CD28(+) and CD4(+)CD27(+) T cells, not able to produce osteoclastogenic cytokines. Also RANKL, OPG and CTX serum levels in CCD patient are similar to controls, whereas QUS measurements showed an osteoporotic status (BTT-Z score -3.09) in the patient. In conclusions, our findings suggest that the heterozygous deletion of RUNX2 in this CCD patient did not alter the osteoclastogenic potential of PBMCs in vitro.
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Affiliation(s)
- Maria Felicia Faienza
- 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy
| | - Annamaria Ventura
- 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy
| | - Laura Piacente
- 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy
| | - Maria Ciccarelli
- 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy
| | - Margherita Gigante
- 2. Nephrology, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Loreto Gesualdo
- 2. Nephrology, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, Bari, Italy
| | - Silvia Colucci
- 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy
| | - Luciano Cavallo
- 1. Department of Biomedical Sciences and Human Oncology, Section of Pediatrics, University of Bari, Bari, Italy
| | - Maria Grano
- 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy
| | - Giacomina Brunetti
- 3. Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Bari, Italy
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Brunetti G, Oranger A, Colucci S, Grano M. Experimental model for studying the involvement of regulatory cytotoxic T cells in bone resorption. Methods Mol Biol 2014; 1186:269-281. [PMID: 25149313 DOI: 10.1007/978-1-4939-1158-5_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
T cells may affect the activity of osteoclasts, the bone resorbing cells. In particular, recently authors focalize their attention on CD8(+) T cells, demonstrating that murine pre-osteoclasts can recruit naïve CD8(+) T cells and induce them to differentiate in regulatory cytotoxic T cells (TcREG), which in turn may suppress osteoclast formation and activity. Thus, here we describe the methodological approach needed to obtain TcREG and to evaluate TcREG effects on murine osteoclast activity and formation in an in vitro experimental model.
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Affiliation(s)
- Giacomina Brunetti
- Section of Human Anatomy and Histology, Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari, Piazza Giulio Cesare, 11, 70124, Bari, Italy,
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Buchwald ZS, Kiesel JR, Yang C, DiPaolo R, Novack DV, Aurora R. Osteoclast-induced Foxp3+ CD8 T-cells limit bone loss in mice. Bone 2013; 56:163-73. [PMID: 23756229 PMCID: PMC3966133 DOI: 10.1016/j.bone.2013.05.024] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/20/2013] [Accepted: 05/30/2013] [Indexed: 01/08/2023]
Abstract
Osteoimmunology is the crosstalk between the skeletal and immune systems. We have previously shown in vitro that osteoclasts (OC) crosspresent antigens to induce FoxP3 in CD8 T-cells (OC-iTc(REG)), which then suppress osteoclast activity. Here we assessed the ability of OC-iTc(REG) to limit bone resorption in vivo. Mice lacking CD8 T-cells lose more bone in response to RANKL (Tnfsf11) administration. Using adoptive transfer experiments we demonstrate that FoxP3(+) CD8 T-cells limit bone loss by RANKL administration. In ovariectomized mice, a murine model of postmenopausal osteoporosis, OC-iTc(REG) limited bone loss and increased bone density as assessed by serum markers, micro computed tomography (μCT) and histomorphometry. Indeed, OC-iTc(REG)-treated ovariectomized mice had decreased levels of effector T-cells in the bone marrow compared to untreated mice, and increased bone formation rates relative to bisphosphonate-treated mice. Our results provide the first in vivo evidence that OC-iTc(REG) have anti-resorptive activity and repress the immune system, thus extending the purview of osteoimmunology.
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Affiliation(s)
- Zachary S. Buchwald
- Dept. of Molecular Microbiology and Immunology, St. Louis University, Saint Louis, MO, USA
| | - Jennifer R. Kiesel
- Dept. of Molecular Microbiology and Immunology, St. Louis University, Saint Louis, MO, USA
| | - Chang Yang
- Division of Bone and Mineral Disease, Department of Medicine, Washington University, Saint Louis, MO, USA
| | - Richard DiPaolo
- Dept. of Molecular Microbiology and Immunology, St. Louis University, Saint Louis, MO, USA
| | - Deborah V. Novack
- Division of Bone and Mineral Disease, Department of Medicine, Washington University, Saint Louis, MO, USA
| | - Rajeev Aurora
- Dept. of Molecular Microbiology and Immunology, St. Louis University, Saint Louis, MO, USA
- Corresponding Author: Rajeev Aurora, Ph.D., Department of Molecular Microbiology and Immunology, St. Louis University School of Medicine, 1100 S. Grand Blvd., DRC605, St. Louis, MO 63104, Voice: 314-977-8891, Fax: 314-977-8717,
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Mendoza Pinto C, García Carrasco M, Etchegaray Morales I, Jiménez Hernández M, Méndez Martínez S, Jiménez Hernández C, Briones Rojas R, Ramos Alvarez G, Rodríguez Gallegos A, Montiel Jarquín A, López Colombo A, Cervera R. Bone mineral density in systemic lupus erythematosus women one year after rituximab therapy. Lupus 2013; 22:1128-34. [PMID: 23989736 DOI: 10.1177/0961203313502861] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The objective of this study was to assess the effects of rituximab on bone mineral density (BMD) in women with systemic lupus erythematosus (SLE) 1 year after treatment. Thirty active female SLE patients treated with rituximab were compared with 43 SLE women not treated with rituximab. BMD was measured using dual energy X-ray absorptiometry (DEXA) before initiating biologic therapy and after 1 year. The mean age was 38.5 ± 2.1 years; median disease duration was 7 years. In the rituximab group, after 1 year of follow-up, BMD at the femoral neck (FN) decreased from 0.980 ± 0.130 g/cm(2) to 0.809 ± 0.139 g/cm(2) (-17.4%; p=0.001). Similarly, BMD at the lumbar spine (LS) decreased from 1.062 ± 0.137 g/cm(2) to 0.893 ± 0.194 g/cm(2) (-15.8%; p=0.001). In control subjects, BMD at the FN decreased from 0.914 ± 0.193 g/cm(2) to 0.890 ± 0.135 g/cm(2) (-2.6%; p=0.001), and BMD at the LS decreased from 0.926 ± 0.128 g/cm(2) to 0.867 ± 0.139 g/cm(2) (-6.2%; p=0.09). After 1 year, SLE patients had lower BMD at both the FN and LS, but the loss was greater in postmenopausal patients who had received rituximab therapy.
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Affiliation(s)
- C Mendoza Pinto
- 1Systemic Autoimmune Diseases Research Unit, IMSS, Puebla, México; Department of Immunology and Rheumatology, BUAP, Puebla, México; Department of Epidemiology and Health Public, BUAP, Puebla, México; Department of Radiology, Laboratorios Clínicos de Puebla, México; Direction of Education and Research, IMSS, Puebla, México; State Research Department, Research Unit, IMSS, Puebla, México; and Department of Autoimmune Diseases, Hospital Clinic, Barcelona, Catalonia, Spain
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Mori G, D'Amelio P, Faccio R, Brunetti G. The Interplay between the bone and the immune system. Clin Dev Immunol 2013; 2013:720504. [PMID: 23935650 PMCID: PMC3725924 DOI: 10.1155/2013/720504] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 06/07/2013] [Indexed: 12/27/2022]
Abstract
In the last two decades, numerous scientists have highlighted the interactions between bone and immune cells as well as their overlapping regulatory mechanisms. For example, osteoclasts, the bone-resorbing cells, are derived from the same myeloid precursor cells that give rise to macrophages and myeloid dendritic cells. On the other hand, osteoblasts, the bone-forming cells, regulate hematopoietic stem cell niches from which all blood and immune cells are derived. Furthermore, many of the soluble mediators of immune cells, including cytokines and growth factors, regulate the activities of osteoblasts and osteoclasts. This increased recognition of the complex interactions between the immune system and bone led to the development of the interdisciplinary osteoimmunology field. Research in this field has great potential to provide a better understanding of the pathogenesis of several diseases affecting both the bone and immune systems, thus providing the molecular basis for novel therapeutic strategies. In these review, we reported the latest findings about the reciprocal regulation of bone and immune cells.
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Affiliation(s)
- Giorgio Mori
- Department of Clinical and Experimental Medicine, University of Foggia, 71100 Foggia, Italy
| | - Patrizia D'Amelio
- Department of Medical Sciences, University of Torino, 10126 Torino, Italy
| | - Roberta Faccio
- Department of Orthopedics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Giacomina Brunetti
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, Section of Human Anatomy and Histology, University of Bari, Piazza Giulio Cesare, 11, 70124 Bari, Italy
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Osteoclasts and CD8 T cells form a negative feedback loop that contributes to homeostasis of both the skeletal and immune systems. Clin Dev Immunol 2013; 2013:429373. [PMID: 23840242 PMCID: PMC3690642 DOI: 10.1155/2013/429373] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 05/22/2013] [Indexed: 11/18/2022]
Abstract
There are a number of dynamic regulatory loops that maintain homeostasis of the immune and skeletal systems. In this review, we highlight a number of these regulatory interactions that contribute to maintaining homeostasis. In addition, we review data on a negative regulatory feedback loop between osteoclasts and CD8 T cells that contributes to homeostasis of both the skeletal and immune systems.
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73
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Luo J, Wen H, Guo H, Cai Q, Li S, Li X. 1,25-dihydroxyvitamin D3 inhibits the RANKL pathway and impacts on the production of pathway-associated cytokines in early rheumatoid arthritis. BIOMED RESEARCH INTERNATIONAL 2013; 2013:101805. [PMID: 23710436 PMCID: PMC3654697 DOI: 10.1155/2013/101805] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 04/01/2013] [Accepted: 04/03/2013] [Indexed: 01/16/2023]
Abstract
OBJECTIVES To study effects of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) on RANKL signaling pathway and pathway-associated cytokines in patients with rheumatoid arthritis (RA). METHODS Receptor activator of nuclear factor-kappa B ligand (RANKL), osteoprotegerin (OPG), IFN- γ , IL-6, TNF- α , IL-17, and IL-4 were examined in 54 patients with incipient RA using a cytometric bead array (CBA) or an enzyme-linked immunosorbent assay (ELISA). RESULTS After 72 hours of incubation of peripheral blood mononuclear cells (PBMCs) with 1,25(OH)2D3 in RA patients, the levels of RANKL, TNF- α , IL-17 and IL-6 significantly decreased compared to those of the control. 1,25(OH)2D3 had no significantly impact on the levels of OPG, RANKL/OPG, and IL-4. CONCLUSIONS The present study demonstrated that 1,25(OH)2D3 reduced the production of RANKL and the secretion of TNF- α , IL-17, and IL-6 in PBMCs of RA patients, which indicated that 1,25(OH)2D3 might be able to decrease damage of cartilage and bone in RA patients by regulating the expression of RANKL signaling pathway and pathway-associated cytokines.
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Affiliation(s)
- Jing Luo
- Division of Rheumatology, Department of Medicine, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Hongyan Wen
- Division of Rheumatology, Department of Medicine, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Hui Guo
- Department of Medicine, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Qi Cai
- Arizona Health Sciences Center, 1501 N. Campbell, Room 4104, P.O. Box 245051, Tucson, AZ 85724, USA
| | - Shuangtian Li
- University of Washington, 1410 NE Campus Parkway, 459 Schmitz Hall, P.O. Box 355832, Seattle, WA 98195-5832, USA
| | - Xiaofeng Li
- Division of Rheumatology, Department of Medicine, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, China
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Moon SJ, Ahn IE, Jung H, Yi H, Kim J, Kim Y, Kwok SK, Park KS, Min JK, Park SH, Kim HY, Ju JH. Temporal differential effects of proinflammatory cytokines on osteoclastogenesis. Int J Mol Med 2013; 31:769-77. [PMID: 23403591 PMCID: PMC3621814 DOI: 10.3892/ijmm.2013.1269] [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: 10/12/2012] [Accepted: 12/10/2012] [Indexed: 12/31/2022] Open
Abstract
Bone destruction and inflammation are closely linked. Cytokines play an important role in inflammatory bone destruction by upregulating the receptor activator of nuclear factor-κB (NF-κB) ligand (RANKL). The direct role of cytokines that act in a non-RANKL-dependent manner has yet to be elucidated. The aim of this study was to investigate the direct osteoclastogenic properties of inflammatory cytokines at different time-points of osteoclastogenesis. Mouse bone marrow macrophages were stimulated with the macrophage colony-stimulating factor (M-CSF) and various concentrations of RANKL. Inflammatory cytokines, such as tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, IL-17 and IL-23, were added to the culture system of osteoclastogenesis. Two time-points of cytokine treatment were set. The ‘early’ effect of each cytokine was investigated at the time of first RANKL treatment, whereas the ‘late’ effect was investigated 48 h after the first RANKL challenge. Osteoclast differentiation and function were assessed using an osteoclast marker [tartrate-resistant acid phosphatase (TRAP)] and by visualization of pit formation. A permissive level of RANKL was required for cytokine-associated osteoclastogenesis in all experiments. In the M-CSF/RANKL monocellular culture system, IL-1β enhanced and IL-6 decreased osteoclast formation in a dose-dependent manner, regardless of temporal differences. Other cytokines showed various responses according to the phase of osteoclast maturation and the concentration of each cytokine and RANKL. Furthermore, luciferase assays showed that both IL-1β and RANKL activated the NF-κB signaling pathway. Collectively, our data revealed that targeting IL-1β may be a promising strategy to inhibit inflammation-associated bone destruction and osteoporosis.
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Affiliation(s)
- Su-Jin Moon
- Division of Rheumatology, Department of Internal Medicine, School of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Host-bacteria crosstalk at the dentogingival junction. Int J Dent 2012; 2012:821383. [PMID: 22899931 PMCID: PMC3412119 DOI: 10.1155/2012/821383] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/22/2012] [Accepted: 05/22/2012] [Indexed: 12/21/2022] Open
Abstract
The dentogingival junction is of crucial importance in periodontal host defense both structurally and functionally. Oral bacteria exert a constant challenge to the host cells and tissues at the dentogingival junction. The host response is set up to eliminate the pathogens by the innate and adaptive defense mechanisms. In health, the commensal bacteria and the host defense mechanisms are in a dynamic steady state. During periodontal disease progression, the dental bacterial plaque, junctional epithelium (JE), inflammatory cells, connective tissue, and bone all go through a series of changes. The tissue homeostasis is turned into tissue destruction and progression of periodontitis. The classical study of Slots showed that in the bacterial plaque, the most remarkable change is the shift from gram-positive aerobic and facultatively anaerobic flora to a predominantly gram-negative and anaerobic flora. This has been later confirmed by several other studies. Furthermore, not only the shift of the bacterial flora to a more pathogenic one, but also bacterial growth as a biofilm on the tooth surface, allows the bacteria to communicate with each other and exert their virulence aimed at favoring their growth. This paper focuses on host-bacteria crosstalk at the dentogingival junction and the models studying it in vitro.
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Onal M, Xiong J, Chen X, Thostenson JD, Almeida M, Manolagas SC, O'Brien CA. Receptor activator of nuclear factor κB ligand (RANKL) protein expression by B lymphocytes contributes to ovariectomy-induced bone loss. J Biol Chem 2012; 287:29851-60. [PMID: 22782898 DOI: 10.1074/jbc.m112.377945] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Production of the cytokine receptor activator of NFκB ligand (RANKL) by lymphocytes has been proposed as a mechanism by which sex steroid deficiency causes bone loss. However, there have been no studies that functionally link RANKL expression in lymphocytes with bone loss in this condition. Herein, we examined whether RANKL expression in either B or T lymphocytes contributes to ovariectomy-induced bone loss in mice. Mice harboring a conditional RANKL allele were crossed with CD19-Cre or Lck-Cre mice to delete RANKL in B or T lymphocytes, respectively. Deletion of RANKL from either cell type had no impact on bone mass in estrogen-replete mice up to 7 months of age. However, mice lacking RANKL in B lymphocytes were partially protected from the bone loss caused by ovariectomy. This protection occurred in cancellous, but not cortical, bone and was associated with a failure to increase osteoclast numbers in the conditional knock-out mice. Deletion of RANKL from T lymphocytes had no impact on ovariectomy-induced bone loss. These results demonstrate that lymphocyte RANKL is not involved in basal bone remodeling, but B cell RANKL does contribute to the increase in osteoclasts and cancellous bone loss that occurs after loss of estrogen.
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Affiliation(s)
- Melda Onal
- Central Arkansas Veterans Healthcare System, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
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Aguila HL, Mun SH, Kalinowski J, Adams DJ, Lorenzo JA, Lee SK. Osteoblast-specific overexpression of human interleukin-7 rescues the bone mass phenotype of interleukin-7-deficient female mice. J Bone Miner Res 2012; 27:1030-42. [PMID: 22258693 PMCID: PMC3361560 DOI: 10.1002/jbmr.1553] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Interleukin-7 is a critical cytokine for lymphoid development and a direct inhibitor of in vitro osteoclastogenesis in murine bone marrow cultures. To explore the role of IL-7 in bone, we generated transgenic mouse lines bearing the 2.3-kb rat collagen 1α1 promoter driving the expression of human IL-7 specifically in osteoblasts. In addition, we crossed these mice with IL-7-deficient mice to determine if the alterations in lymphopoiesis, bone mass, and osteoclast formation observed in the IL-7 knockout (KO) mice could be rescued by osteoblast-specific overexpression of IL-7. Here, we show that mice overexpressing human IL-7 in the osteoblast lineage showed increased trabecular bone volume in vivo by µCT and decreased osteoclast formation in vitro. Furthermore, targeted overexpression of IL-7 in osteoblasts rescued the osteopenic bone phenotype and B-cell development of IL-7 KO mice but did not have an effect on T lymphopoiesis, which occurs in the periphery. The bone phenotypes in IL-7 KO mice and targeted IL-7-overexpressing mouse models were observed only in females. These results likely reflect both direct inhibitory effects of IL-7 on osteoclastogenesis in vivo and sex-specific differences in responses to IL-7.
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Affiliation(s)
- Hector L. Aguila
- Department of Immunology, University of Connecticut Health Center, Farmington, CT 06030
| | - Se Hwan Mun
- UCONN Center on Aging, University of Connecticut Health Center, Farmington, CT 06030
| | - Judith Kalinowski
- Division of Endocrinology, Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030
| | - Douglas J. Adams
- Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06030
| | - Joseph A. Lorenzo
- Division of Endocrinology, Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030
| | - Sun-Kyeong Lee
- UCONN Center on Aging, University of Connecticut Health Center, Farmington, CT 06030
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Kular J, Tickner J, Chim SM, Xu J. An overview of the regulation of bone remodelling at the cellular level. Clin Biochem 2012; 45:863-73. [PMID: 22465238 DOI: 10.1016/j.clinbiochem.2012.03.021] [Citation(s) in RCA: 344] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Revised: 03/07/2012] [Accepted: 03/13/2012] [Indexed: 01/11/2023]
Abstract
OBJECTIVES To review the current literature on the regulation of bone remodelling at the cellular level. DESIGN AND METHODS The cellular activities of the cells in the basic multicellular unit (BMU) were evaluated. RESULTS Bone remodelling requires an intimate cross-talk between osteoclasts and osteoblasts and is tightly coordinated by regulatory proteins that interact through complex autocrine/paracrine mechanisms. Osteocytes, bone lining cells, osteomacs, and vascular endothelial cells also regulate bone remodelling in the BMU via cell signalling networks of ligand-receptor complexes. In addition, through secreted and membrane-bound factors in the bone microenvironment, T and B lymphocytes mediate bone homeostasis in osteoimmunology. CONCLUSIONS Osteoporosis and other bone diseases occur because multicellular communication within the BMU is disrupted. Understanding the cellular and molecular basis of bone remodelling and the discovery of novel paracrine or coupling factors, such as RANKL, sclerostin, EGFL6 and semaphorin 4D, will lay the foundation for drug development against bone diseases.
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Affiliation(s)
- Jasreen Kular
- School of Pathology and Laboratory Medicine, The University of Western Australia, Western Australia, Australia
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Anjubault T, Martin J, Hubert FX, Chauvin C, Heymann D, Josien R. Constitutive expression of TNF-related activation-induced cytokine (TRANCE)/receptor activating NF-κB ligand (RANK)-L by rat plasmacytoid dendritic cells. PLoS One 2012; 7:e33713. [PMID: 22428075 PMCID: PMC3302772 DOI: 10.1371/journal.pone.0033713] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Accepted: 02/15/2012] [Indexed: 02/02/2023] Open
Abstract
Plasmacytoid dendritic cells (pDCs) are a subset of DCs whose major function relies on their capacity to produce large amount of type I IFN upon stimulation via TLR 7 and 9. This function is evolutionary conserved and place pDC in critical position in the innate immune response to virus. Here we show that rat pDC constitutively express TNF-related activation-induced cytokine (TRANCE) also known as Receptor-activating NF-κB ligand (RANKL). TRANCE/RANKL is a member of the TNF superfamily which plays a central role in osteoclastogenesis through its interaction with its receptor RANK. TRANCE/RANK interaction are also involved in lymphoid organogenesis as well as T cell/DC cross talk. Unlike conventional DC, rat CD4high pDC were shown to constitutively express TRANCE/RANKL both at the mRNA and the surface protein level. TRANCE/RANKL was also induced on the CD4low subsets of pDC following activation by CpG. The secreted form of TRANCE/RANKL was also produced by rat pDC. Of note, levels of mRNA, surface and secreted TRANCE/RANKL expression were similar to that observed for activated T cells. TRANCE/RANKL expression was found on pDC in all lymphoid organs as well blood and BM with a maximum expression in mesenteric lymph nodes. Despite this TRANCE/RANKL expression, we were unable to demonstrate in vitro osteoclastogenesis activity for rat pDC. Taken together, these data identifies pDC as novel source of TRANCE/RANKL in the immune system.
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Affiliation(s)
- Thomas Anjubault
- INSERM UMR 1064, Nantes, France
- CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), Nantes, France
| | - Jérôme Martin
- INSERM UMR 1064, Nantes, France
- CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), Nantes, France
- CHU Nantes, Laboratoire d'Immunologie, Nantes, France
| | - François-Xavier Hubert
- INSERM UMR 1064, Nantes, France
- CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), Nantes, France
| | - Camille Chauvin
- INSERM UMR 1064, Nantes, France
- CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), Nantes, France
| | - Dominique Heymann
- INSERM UMR 791, Nantes, France
- Université de Nantes, Faculté de Médecine, Nantes, France
| | - Régis Josien
- INSERM UMR 1064, Nantes, France
- CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), Nantes, France
- CHU Nantes, Laboratoire d'Immunologie, Nantes, France
- Université de Nantes, Faculté de Médecine, Nantes, France
- * E-mail:
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Wheater G, Hogan VE, Teng YKO, Tekstra J, Lafeber FP, Huizinga TWJ, Bijlsma JWJ, Francis RM, Tuck SP, Datta HK, van Laar JM. Suppression of bone turnover by B-cell depletion in patients with rheumatoid arthritis. Osteoporos Int 2011; 22:3067-72. [PMID: 21625887 DOI: 10.1007/s00198-011-1607-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Accepted: 02/17/2011] [Indexed: 10/18/2022]
Abstract
UNLABELLED The role of B cells in inflammatory bone formation and resorption is controversial. We investigated this in patients with rheumatoid arthritis (RA) treated with rituximab, a B-cell depleting antibody. We found a significant suppression in bone turnover, possibly a direct effect or as a consequence of a reduction in inflammation and disease activity. INTRODUCTION RA is the most prevalent inflammatory joint disease, in which B cells play an important role. However, the role of B cells in bone turnover is controversial and RA subjects treated with rituximab, a B-cell depleting monoclonal antibody, provide an ideal model for determining the role of B cells in inflammatory bone resorption. METHODS Serum from 46 RA patients, collected pre- and post-rituximab therapy, was analysed for biomarkers of bone turnover (procollagen type I amino-terminal propeptide [P1NP], osteocalcin, β-isomerised carboxy-terminal telopeptide of type 1 collagen [βCTX] and osteoprotegerin [OPG]). RESULTS A significant decrease in bone resorption was observed 6 months after rituximab (median change βCTX -50 ng/L, 95%CI -136, -8 p < 0.001, this equates to -37%; 95%CI -6, -49), mirrored by a reduction in disease activity. Similarly, there was a significant increase in P1NP, a marker of bone formation (median change P1NP 5.0 μg/L, 95%CI -1.0, 11.2, p = 0.02; 13%; 95%CI -3, 39), but no significant change in osteocalcin or OPG levels. The percentage change from baseline of βCTX in a subgroup of patients (not on prednisolone or bisphosphonate) was significantly correlated with the percentage reduction in DAS28 score (r (s) = 0.570, p = 0.014). CONCLUSIONS In conclusion, we have found that B-cell depletion increases bone formation and decreases bone resorption in RA patients; this may be a direct effect on osteoblasts and osteoclasts, respectively, and be at least partially explained by the decreased inflammation and disease activity.
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Affiliation(s)
- G Wheater
- Department of Biochemistry, The James Cook University Hospital, Middlesbrough, TS4 3BW, UK.
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Atanga E, Dolder S, Dauwalder T, Wetterwald A, Hofstetter W. TNFα inhibits the development of osteoclasts through osteoblast-derived GM-CSF. Bone 2011; 49:1090-100. [PMID: 21884837 DOI: 10.1016/j.bone.2011.08.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 07/12/2011] [Accepted: 08/04/2011] [Indexed: 01/21/2023]
Abstract
Inflammatory cytokines such as tumor necrosis factor-alpha (TNFα) are potent stimulators of osteoclast formation and bone resorption and are frequently associated with pathologic bone metabolism. The cytokine exerts specific effects on its target cells and constitutes a part of the cellular microenvironment. Previously, TNFα was demonstrated to inhibit the development of osteoclasts in vitro via an osteoblast-mediated pathway. In the present study, the molecular mechanisms of the inhibition of osteoclastogenesis were investigated in co-cultures of osteoblasts and bone marrow cells (BMC) and in cultures of macrophage-colony stimulating factor (M-CSF) dependent, non-adherent osteoclast progenitor cells (OPC) grown with M-CSF and receptor activator of NF-κB ligand (RANKL). Granulocyte-macrophage colony stimulating factor (GM-CSF), a known inhibitor of osteoclastogenesis was found to be induced in osteoblasts treated with TNFα and the secreted protein accumulated in the supernatant. Dexamethasone (Dex), an anti-inflammatory steroid, caused a decrease in GM-CSF expression, leading to partial recovery of osteoclast formation. Flow cytometry analysis revealed that in cultures of OPC, supplemented with 10% conditioned medium (CM) from osteoblasts treated with TNFα/1,25(OH)(2)D(3), expression of RANK and CD11c was suppressed. The decrease in RANK expression may be explained by the finding, that GM-CSF and the CM from wt osteoblasts were found to suppress the expression of c-Fos, Fra-1, and Nfatc-1. The failure of OPC to develop into CD11c(+) dendritic cells suggests that cell development is not deviated to an alternative differentiation pathway, but rather, that the monocytes are maintained in an undifferentiated, F4/80(+), state. The data further implies possible interactions among inflammatory cytokines. GM-CSF induced by TNFα acts on early hematopoietic precursors, inhibiting osteoclastogenesis while acting as the growth factor for M-CSF independent inflammatory macrophages. These in turn may condition a microenvironment enhancing osteoclast differentiation and bone resorption upon migration of the OPC from circulation to the bone/bone marrow compartment.
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Affiliation(s)
- Elvis Atanga
- Group for Bone Biology and Orthopaedic Research, Department Clinical Research, University of Bern, Murtenstrasse 35, CH-3010 Bern, Switzerland.
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82
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Im NK, Lee HJ, Yu MH, Kim HJ, Lee IS. Inhibitory effect of fractions from skullcap (Scutellaria baicalensis Georgi) on osteoclast differentiation and bone resorption. Food Sci Biotechnol 2011. [DOI: 10.1007/s10068-011-0167-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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83
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Kook SH, Jang YS, Lee JC. Human periodontal ligament fibroblasts stimulate osteoclastogenesis in response to compression force through TNF-α-mediated activation of CD4+ T cells. J Cell Biochem 2011; 112:2891-901. [DOI: 10.1002/jcb.23205] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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84
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Abstract
Studies on the immune regulation of osteoclasts in rheumatoid arthritis have promoted the new research field of 'osteoimmunology', which investigates the interplay between the skeletal and immune systems at the molecular level. Accumulating evidence lends support to the theory that bone destruction associated with rheumatoid arthritis is caused by the enhanced activity of osteoclasts, resulting from the activation of a unique helper T cell subset, 'Th17 cells'. Understanding the interaction between osteoclasts and the adaptive immune system in rheumatoid arthritis and the molecular mechanisms of Th17 development will lead to the development of potentially effective therapeutic strategies.
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85
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Bishop KA, Coy HM, Nerenz RD, Meyer MB, Pike JW. Mouse Rankl expression is regulated in T cells by c-Fos through a cluster of distal regulatory enhancers designated the T cell control region. J Biol Chem 2011; 286:20880-91. [PMID: 21487009 DOI: 10.1074/jbc.m111.231548] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Receptor activator of NF-κB ligand (Rankl) is a TNF-like factor that induces the formation of osteoclasts responsible for bone resorption. Although T cell activation up-regulates this gene, the molecular mechanism of its transcriptional control remains unknown. We used ChIP-chip analysis in mouse primary T cells and a T cell hybridoma to define the regulatory enhancers responsible for this up-regulation and to characterize their properties. Elevated H3/H4 acetylation and increased RNA polymerase II density were evident at mRL-D5, a known enhancer located 76 kb upstream of the TSS, as well as at a cluster of regulatory sites located even further upstream between -123 to -156 kb, termed the T cell control region (TCCR). Based upon the ability of calcium signaling and MAPK inhibitors to block Rankl expression, we conducted further ChIP-chip analysis of the transcriptional mediators c-Fos, NF-κB, and Nfat. T cell activation induced c-Fos binding at the mRL-D5 enhancer and within the TCCR. The interaction of NF-κB was observed at the transcriptional start site and at mRL-D5. Both mRL-D5 and segments of the TCCR exhibited robust transcriptional activity in reporter assays, and site-specific mutagenesis of c-Fos and Nfat elements abrogated reporter activity, suggesting a role for both factors in the control of enhancer-mediated Rankl transcription. Finally, chromosome conformation capture analysis confirmed that mRL-D5 and segments of the TCCR were located in proximity to the Rankl gene promoter and thus potentially able to influence directly Rankl gene promoter activity. We conclude that both mRL-D5 and the TCCR represent control segments that play an integral role in Rankl expression in T cells.
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Affiliation(s)
- Kathleen A Bishop
- Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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86
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Preshaw PM, Taylor JJ. How has research into cytokine interactions and their role in driving immune responses impacted our understanding of periodontitis? J Clin Periodontol 2011; 38 Suppl 11:60-84. [DOI: 10.1111/j.1600-051x.2010.01671.x] [Citation(s) in RCA: 256] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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87
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Abstract
Inflammation perturbs normal bone homeostasis and is known to induce bone loss, as it promotes both local cartilage degradation and local and systemic bone destruction by osteoclasts, as well as inhibits bone formation by osteoblasts. Thus, not surprisingly, inflammatory autoimmune diseases often lead to local and/or general bone loss. However, the mechanisms that target the bone in autoimmune disease are complex and diverse, as they range from a direct attack on the bone and cartilage by the immune cells to indirect consequences of disturbances of the systemic control of bone remodeling. This Review discusses current understanding of the mechanisms of autoimmune-mediated bone loss in view of new insight from two new fields of research: osteoimmunology, which analyzes the direct effect of immune cells on bone, and the integrative metabolism approach, which established the existence of neuroendocrine loops that regulate bone remodeling.
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Affiliation(s)
- Georg Schett
- Department of Internal Medicine 3, Rheumatology and Immunology, University of Erlangen-Nuremberg, Krankenhausstraβe 12, D-91054 Erlangen, Germany
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88
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Abstract
There is emerging interest for osteoclasts as key players in the erosive and inflammatory events leading to joint destruction in chronic arthritis. In fact, chronic inflammatory joint diseases such as psoriatic arthritis and rheumatoid arthritis are often characterized by destruction of juxta-articular bone and erosions due to the elevated activity of osteoclasts, which are involved in bone resorption. The main step in inflammatory bone erosion is an imbalance between bone resorption and bone formation: osteoclast formation is enhanced by proinflammatory cytokines such as TNF-α, IL-1β, and IL-17 and is not balanced by increased activity of bone-forming osteoblasts. T-cells, stromal cells, and synoviocytes enhance osteoclast formation via expression of RANKL and, under pathologic conditions, of proinflammatory cytokines. In rheumatoid arthritis, accumulation of osteoclasts in synovial tissues and their activation associated with osteoclastogenic cytokines and chemokines at cartilage erosion sites suggest that they could be usefully selected as therapeutic target. In particular, in consideration of the primary role of RANKL and TNF-α in osteoclastogenesis, the control of the production of RANKL and the inhibition of TNF-α represent important strategies for reducing bone damage in this disease.
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89
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Kajiya M, Giro G, Taubman MA, Han X, Mayer MPA, Kawai T. Role of periodontal pathogenic bacteria in RANKL-mediated bone destruction in periodontal disease. J Oral Microbiol 2010; 2. [PMID: 21523224 PMCID: PMC3084575 DOI: 10.3402/jom.v2i0.5532] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 09/14/2010] [Accepted: 10/11/2010] [Indexed: 11/18/2022] Open
Abstract
Accumulated lines of evidence suggest that hyperimmune responses to periodontal bacteria result in the destruction of periodontal connective tissue and alveolar bone. The etiological roles of periodontal bacteria in the onset and progression of periodontal disease (PD) are well documented. However, the mechanism underlying the engagement of periodontal bacteria in RANKL-mediated alveolar bone resorption remains unclear. Therefore, this review article addresses three critical subjects. First, we discuss earlier studies of immune intervention, ultimately leading to the identification of bacteria-reactive lymphocytes as the cellular source of osteoclast-induction factor lymphokine (now called RANKL) in the context of periodontal bone resorption. Next, we consider (1) the effects of periodontal bacteria on RANKL production from a variety of adaptive immune effector cells, as well as fibroblasts, in inflamed periodontal tissue and (2) the bifunctional roles (upregulation vs. downregulation) of LPS produced from periodontal bacteria in a RANKL-induced osteoclast-signal pathway. Future studies in these two areas could lead to new therapeutic approaches for the management of PD by down-modulating RANKL production and/or RANKL-mediated osteoclastogenesis in the context of host immune responses against periodontal pathogenic bacteria.
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Affiliation(s)
- Mikihito Kajiya
- Department of Immunology, The Forsyth Institute, Boston, MA, USA
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90
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Effros RB. Telomere/telomerase dynamics within the human immune system: effect of chronic infection and stress. Exp Gerontol 2010; 46:135-40. [PMID: 20833238 DOI: 10.1016/j.exger.2010.08.027] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2010] [Revised: 08/18/2010] [Accepted: 08/27/2010] [Indexed: 02/08/2023]
Abstract
Aging of the immune system is a major factor responsible for the increased severity of infections, reduced responses to vaccines, and higher cancer incidence in the elderly. A major category of stressors that contribute to the alterations within the T lymphocyte compartment is the family of herpes viruses. These viruses, usually acquired early in life, persist for many decades and drive certain T cells to the end stage of replicative senescence, which is characterized by a variety of phenotypic and functional changes, including altered cytokine profile, resistance to apoptosis, and shortened telomeres. Indeed, high proportions of senescent CD8 (cytotoxic) T lymphocytess are associated with latent cytomegalovirus (CMV) infection in the elderly, and are part of a cluster of immune biomarkers that are associated with early mortality. Similar cells accumulate at younger ages in persons chronically infected with HIV-1. In addition to persistent viral infection, psychological stress as well as oxidative stress can also contribute to the generation of senescent dysfunctional T lymphocytes. Strategies such as cell culture manipulation of replicative senescence, as well as lifestyle and stress reduction techniques are discussed in terms of possible approaches to enhance immune function in older persons. This review highlights the importance of using humans in studies on immunosenescence and telomere/telomerase dynamics, since model organisms employed in other facets of aging research are not subject to the particular factors that cause the striking age-related reconfiguration of the human immune system.
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Affiliation(s)
- Rita B Effros
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1732, USA.
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91
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Alterations in the immuno-skeletal interface drive bone destruction in HIV-1 transgenic rats. Proc Natl Acad Sci U S A 2010; 107:13848-53. [PMID: 20643942 DOI: 10.1073/pnas.1003020107] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Osteoporosis and bone fractures are increasingly recognized complications of HIV-1 infection. Although antiretroviral therapy itself has complex effects on bone turnover, it is now evident that the majority of HIV-infected individuals already exhibit reduced bone mineral density before therapy. The mechanisms responsible are likely multifactorial and have been difficult to delineate in humans. The HIV-1 transgenic rat recapitulates many key features of human AIDS. We now demonstrate that, like their human counterparts, HIV-1 transgenic rats undergo severe osteoclastic bone resorption, a consequence of an imbalance in the ratio of receptor activator of NF-kappaB ligand, the key osteoclastogenic cytokine, to that of its physiological decoy receptor osteoprotegerin. This imbalance stemmed from a switch in production of osteoprotegerin to that of receptor activator of NF-kappaB ligand by B cells, and was further compounded by a significantly elevated number of osteoclast precursors. With the advancing age of individuals living with HIV/AIDS, low bone mineral density associated with HIV infection is likely to collide with the pathophysiology of skeletal aging, leading to increased fracture risk. Understanding the mechanisms driving bone loss in HIV-infected individuals will be critical to developing effective therapeutic strategies.
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92
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Zaiss MM, Frey B, Hess A, Zwerina J, Luther J, Nimmerjahn F, Engelke K, Kollias G, Hünig T, Schett G, David JP. Regulatory T Cells Protect from Local and Systemic Bone Destruction in Arthritis. THE JOURNAL OF IMMUNOLOGY 2010; 184:7238-46. [DOI: 10.4049/jimmunol.0903841] [Citation(s) in RCA: 154] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Liu YCG, Lerner UH, Teng YTA. Cytokine responses against periodontal infection: protective and destructive roles. Periodontol 2000 2010; 52:163-206. [PMID: 20017801 DOI: 10.1111/j.1600-0757.2009.00321.x] [Citation(s) in RCA: 197] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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94
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Guentsch A, Rönnebeck M, Puklo M, Preshaw PM, Pfister W, Eick S. Influence of serum on interaction ofPorphyromonas gingivalisATCC 33277 andAggregatibacter actinomycetemcomitansY4 with an epithelial cell line. J Periodontal Res 2010; 45:229-38. [DOI: 10.1111/j.1600-0765.2009.01224.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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95
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Abstract
Osteoclasts are highly specialized cells capable of degrading mineralized tissue and form at different regions of bone to meet different physiological needs, such as mobilization of calcium, modeling of bone structure, and remodeling of bone matrix. Osteoclast production is elevated in a number of pathological conditions, many of which lead to loss of bone mass. Whether normal or pathological, osteoclastogenesis strictly depends upon support from accessory cells which supply cytokines required for osteoclast differentiation. Only one of these cytokines, receptor activator of NFkappaB ligand (RANKL), is absolutely essential for osteoclast formation throughout life and is thus expressed by all cell types that support osteoclast differentiation. The central role of RANKL in bone resorption is highlighted by the fact that it is the basis for a new therapy to inhibit bone loss. This review will discuss mechanisms that control RANKL gene expression in different osteoclast-support cells and how the study of such mechanisms may lead to a better understanding of the cellular interactions that drive normal and pathological bone resorption.
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Affiliation(s)
- Charles A O'Brien
- Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, and Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA.
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96
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Liu YCG, Teng YTA. Dendritic Cell-Associated Osteoclastogenesis and Bone Loss. Clin Rev Bone Miner Metab 2009. [DOI: 10.1007/s12018-009-9059-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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97
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Spahni AI, Schawalder P, Rothen B, Bosshardt DD, Lang N, Stoffel MH. Immunohistochemical localization of RANK, RANKL and OPG in healthy and arthritic canine elbow joints. Vet Surg 2009; 38:780-6. [PMID: 19674422 DOI: 10.1111/j.1532-950x.2009.00566.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To determine if the receptor activator of nuclear factor-kappaB-receptor activator of nuclear factor-kappaB ligand-osteoprotegerin (RANK-RANKL-OPG) system is active in bone remodeling in dogs and, if so, whether differences in expression of these mediators occur in healthy and arthritic joints. STUDY DESIGN Experimental study. SAMPLE POPULATION Fragmented processus coronoidei (n=20) were surgically removed from dogs with elbow arthritis and 5 corresponding healthy samples from dogs euthanatized for reasons other than elbow joint disease. METHODS Bright-field immunohistochemistry and high-resolution fluorescence microscopy were used to investigate the distribution of RANK, RANKL, and OPG in healthy and arthritic joints. RESULTS All 3 molecules were identified by immunostaining of canine bone tissue. In elbow dysplasia, the number of RANK-positive osteoclasts was increased. In their vicinity, cells expressing RANKL, a mediator of osteoclast activation, were abundant whereas the number of osteoblasts having the potential to limit osteoclastogenesis and bone resorption via OPG was few. CONCLUSIONS The RANK-RANKL-OPG system is active in bone remodeling in dogs. In elbow dysplasia, a surplus of molecules promoting osteoclastogenesis was evident and is indicative of an imbalance between the mediators regulating bone resorption and bone formation. Both OPG and neutralizing antibodies against RANKL have the potential to counterbalance bone resorption. CLINICAL RELEVANCE Therapeutic use of neutralizing antibodies against RANKL to inhibit osteoclast activation warrants further investigation.
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Affiliation(s)
- Andrea I Spahni
- Department of Clinical Veterinary Medicine, the Division of Small Animal Surgery and Orthopedics, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
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99
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Han X, Lin X, Seliger AR, Eastcott J, Kawai T, Taubman MA. Expression of receptor activator of nuclear factor-kappaB ligand by B cells in response to oral bacteria. ACTA ACUST UNITED AC 2009; 24:190-6. [PMID: 19416447 DOI: 10.1111/j.1399-302x.2008.00494.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
INTRODUCTION We investigated receptor activator of nuclear factor-kappaB ligand (RANKL) expression by B lymphocytes during early and late aspects of the immune response to Aggregatibacter actinomycetemcomitans, a gram-negative, anaerobic bacterium associated with aggressive periodontal disease. METHODS Expression of messenger RNA transcripts (tumor necrosis factor-alpha, Toll-like receptors 4 and 9, interleukins 4 and 10, and RANKL) involved in early (1-day) and late (10-day) responses in cultured rat splenocytes was examined by reverse transcription-polymerase chain reaction (RT-PCR). The immune cell distribution (T, B, and natural killer cells and macrophages) in cultured rat splenocytes and RANKL expression in B cells were determined by flow cytometric analyses. B-cell capacity for induction of osteoclast differentiation was evaluated by coculture with RAW 264.7 cells followed by a tartrate-resistant acid phosphatase (TRAP) activity assay. RESULTS The expression levels of interleukins 4 and 10 in cultured cells were not changed in the presence of A. actinomycetemcomitans until cultured for 3 days, and peaked after 7 days. After culture for 10 days, the percentages of B and T cells, the overall RANKL messenger RNA transcripts, and the percentage of RANKL-expressing immunoglobulin G-positive cells were significantly increased in the presence of A. actinomycetemcomitans. These increases were considerably greater in cells isolated from A. actinomycetemcomitans-immunized animals than from non-immunized animals. RAW 264.7 cells demonstrated significantly increased TRAP activity when cocultured with B cells from A. actinomycetemcomitans-immunized animals. The addition of human osteoprotegerin-Fc to the culture significantly diminished such increases. CONCLUSION This study suggests that B-lymphocyte involvement in the immune response to A. actinomycetemcomitans through upregulation of RANKL expression potentially contribute to bone resorption in periodontal disease.
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Affiliation(s)
- X Han
- Department of Immunology, The Forsyth Institute, Boston, MA 02115-3799, USA
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100
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Shanmugarajan S, Kawanabe N, Koide M, Tsuruga E, Arroyo JE, Key LL, Reddy SV. IL-12 stimulates the osteoclast inhibitory peptide-1 (OIP-1/hSca) gene expression in CD4+ T cells. J Cell Biochem 2009; 107:104-11. [PMID: 19259951 DOI: 10.1002/jcb.22104] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Immune cell products such as interferon (IFN)-gamma and interleukin (IL)-12 are potent inhibitors of osteoclast formation. We previously characterized the human osteoclast inhibitory peptide-1 (OIP-1/hSca), a Ly-6 gene family member and showed IFN-gamma modulation of OIP-1 expression in bone marrow cells. Whether, IL-12 regulates OIP-1 expression in the bone microenvironment is unclear. Real-time PCR analysis revealed that IL-12 treatment significantly enhanced OIP-1 mRNA expression in human bone marrow mononuclear cells. Because IL-12 induces IFN-gamma production by T cells, we tested whether IFN-gamma participates in IL-12 stimulation of OIP-1 gene expression in these cells. IL-12 treatment in the presence of IFN-gamma neutralizing antibody significantly increased OIP-1 mRNA expression, suggesting that IL-12 directly regulates OIP-1 gene expression. Interestingly, real-time PCR analysis demonstrated that IL-12 induces OIP-1 expression (3.2-fold) in CD4+ T cells; however, there was no significant change in CD8+ T cells. Also, IL-12 (10 ng/ml) treatment of Jurkat cells transfected with OIP-1 gene (-1 to -1,988 bp) promoter-luciferase reporter plasmid demonstrated a 5-fold and 2.7-fold increase in OIP-1 gene promoter activity in the presence and absence of antibody against IFN-gamma, respectively. We showed that STAT-1,3 inhibitors treatment significantly decreased IL-12 stimulated OIP-1 promoter activity. Chromatin immunoprecipitation (ChIP) assay confirmed STAT-3, but not STAT-1 binding to the OIP-1 gene promoter in response to IL-12 stimulation. These results suggest that IL-12 stimulates the OIP-1 gene expression through STAT-3 activation in CD4+ T cells.
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Affiliation(s)
- Srinivasan Shanmugarajan
- Charles P Darby Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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