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Miao J, Wang HM, Pan XH, Gong Z, Gao XM, Gong FY. hFcγRIIa: a double-edged sword in osteoclastogenesis and bone balance in transgenic mice. Front Immunol 2024; 15:1425670. [PMID: 39281679 PMCID: PMC11392756 DOI: 10.3389/fimmu.2024.1425670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Accepted: 08/15/2024] [Indexed: 09/18/2024] Open
Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune disease accompanied by local and systemic bone loss. FcγRs, especially FcγRIIa (hFcγRIIa), have been implicated in the pathogenesis of RA. However, the contribution of hFcγRIIa to bone loss has not been fully elucidated. In the present study, we demonstrated the double-edged sword role of hFcγRIIa on osteoclast differentiation through investigations involving hFcγRIIa-transgenic (hFcγRIIa-Tg) mice. Our findings reveal that hFcγRIIa-Tg mice, previously shown to exhibit heightened susceptibility to collagen-induced arthritis (CIA), displayed increased osteoporosis during CIA or at advanced ages (40 weeks), accompanied by heightened in vivo osteoclast differentiation. Notably, bone marrow cells from hFcγRIIa-Tg mice exhibited enhanced efficiency in differentiating into osteoclasts and bone resorption in vitro compared to wild-type mice when stimulated with receptor activators of NF-κB ligand (RANKL). Additionally, hFcγRIIa-Tg mice exhibited augmented sensitivity to RANKL-induced bone loss in vivo, highlighting the osteoclast-promoting role of hFcγRIIa. Mechanistically, bone marrow cells from hFcγRIIa-Tg mice displayed heightened Syk self-activation, leading to mTOR-pS6 pathway activation, thereby promoting RANKL-driven osteoclast differentiation. Intriguingly, while hFcγRIIa crosslinking hindered RANKL-induced osteoclast differentiation, it activated the kinase cAbl, subsequently triggering STAT5 activation and inhibiting the expression of osteoclast-associated genes. This study provides novel insights into hFcγRIIa-mediated osteoclast biology, suggesting promising therapeutic targets for managing bone remodeling disorders.
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Affiliation(s)
| | | | | | | | - Xiao-Ming Gao
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
| | - Fang-Yuan Gong
- School of Biology and Basic Medical Sciences, Suzhou Medical College, Soochow University, Suzhou, China
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2
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Wang H, Divaris K, Pan B, Li X, Lim JH, Saha G, Barovic M, Giannakou D, Korostoff JM, Bing Y, Sen S, Moss K, Wu D, Beck JD, Ballantyne CM, Natarajan P, North KE, Netea MG, Chavakis T, Hajishengallis G. Clonal hematopoiesis driven by mutated DNMT3A promotes inflammatory bone loss. Cell 2024; 187:3690-3711.e19. [PMID: 38838669 PMCID: PMC11246233 DOI: 10.1016/j.cell.2024.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 02/19/2024] [Accepted: 05/01/2024] [Indexed: 06/07/2024]
Abstract
Clonal hematopoiesis of indeterminate potential (CHIP) arises from aging-associated acquired mutations in hematopoietic progenitors, which display clonal expansion and produce phenotypically altered leukocytes. We associated CHIP-DNMT3A mutations with a higher prevalence of periodontitis and gingival inflammation among 4,946 community-dwelling adults. To model DNMT3A-driven CHIP, we used mice with the heterozygous loss-of-function mutation R878H, equivalent to the human hotspot mutation R882H. Partial transplantation with Dnmt3aR878H/+ bone marrow (BM) cells resulted in clonal expansion of mutant cells into both myeloid and lymphoid lineages and an elevated abundance of osteoclast precursors in the BM and osteoclastogenic macrophages in the periphery. DNMT3A-driven clonal hematopoiesis in recipient mice promoted naturally occurring periodontitis and aggravated experimentally induced periodontitis and arthritis, associated with enhanced osteoclastogenesis, IL-17-dependent inflammation and neutrophil responses, and impaired regulatory T cell immunosuppressive activity. DNMT3A-driven clonal hematopoiesis and, subsequently, periodontitis were suppressed by rapamycin treatment. DNMT3A-driven CHIP represents a treatable state of maladaptive hematopoiesis promoting inflammatory bone loss.
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Affiliation(s)
- Hui Wang
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kimon Divaris
- Division of Pediatric and Public Health, Adams School of Dentistry, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA; Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA
| | - Bohu Pan
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
| | - Xiaofei Li
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Shanghai Jiao Tong University, School of Life Sciences and Biotechnology, Sheng Yushou Center of Cell Biology and Immunology, Shanghai 200240, China
| | - Jong-Hyung Lim
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Gundappa Saha
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Marko Barovic
- Institute for Clinical Chemistry and Laboratory Medicine, University Hospital, Technische Universität Dresden, 01307 Dresden, Germany
| | - Danai Giannakou
- Institute for Clinical Chemistry and Laboratory Medicine, University Hospital, Technische Universität Dresden, 01307 Dresden, Germany
| | - Jonathan M Korostoff
- Department of Periodontics, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Yu Bing
- Human Genetics Center, Department of Epidemiology, School of Public Health, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Souvik Sen
- Department of Neurology, University of South Carolina, Columbia, SC 29209, USA; Center for the Study of Aphasia Recovery, University of South Carolina, Columbia, SC 29209, USA
| | - Kevin Moss
- Department of Biostatistics and Health Data Sciences, School of Medicine, Indiana University, Indianapolis, IN 46202, USA; Division of Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA
| | - Di Wu
- Division of Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA; Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA
| | - James D Beck
- Division of Comprehensive Oral Health-Periodontology, Adams School of Dentistry, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA
| | | | - Pradeep Natarajan
- Cardiovascular Research Center and Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Program in Medical and Population Genetics, Broad Institute of Harvard and MIT, Cambridge, MA 02141, USA; Department of Medicine, Harvard Medical School, Boston, MA 02115, USA
| | - Kari E North
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, Chapel Hill, NC 27599, USA
| | - Mihai G Netea
- Department of Internal Medicine and Radboud Center for Infectious Diseases, Radboud University Medical Center, 6525 XZ Nijmegen, the Netherlands; Department of Immunology and Metabolism, LIMES, University of Bonn, 53115 Bonn, Germany
| | - Triantafyllos Chavakis
- Institute for Clinical Chemistry and Laboratory Medicine, University Hospital, Technische Universität Dresden, 01307 Dresden, Germany
| | - George Hajishengallis
- Department of Basic and Translational Sciences, Laboratory of Innate Immunity and Inflammation, Penn Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Yang KL, Mullins BJ, Lejeune A, Ivanova E, Shin J, Bajwa S, Possemato R, Cadwell K, Scher JU, Koralov SB. Mitigation of Osteoclast-Mediated Arthritic Bone Remodeling By Short Chain Fatty Acids. Arthritis Rheumatol 2024; 76:647-659. [PMID: 37994265 DOI: 10.1002/art.42765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 10/24/2023] [Accepted: 11/13/2023] [Indexed: 11/24/2023]
Abstract
OBJECTIVE The objective for this study was to evaluate the effects of short chain fatty acids (SCFAs) on arthritic bone remodeling. METHODS We treated a recently described preclinical murine model of psoriatic arthritis (PsA), R26STAT3Cstopfl/fl CD4Cre mice, with SCFA-supplemented water. We also performed in vitro osteoclast differentiation assays in the presence of serum-level SCFAs to evaluate the direct impact of these microbial metabolites on maturation and function of osteoclasts. We further characterized the molecular mechanism of SCFAs by transcriptional analysis. RESULTS The osteoporosis condition in R26STAT3Cstopfl/fl CD4Cre animals is attributed primarily to robust osteoclast differentiation driven by an expansion of osteoclast progenitor cells (OCPs), accompanied by impaired osteoblast development. We show that SCFA supplementation can rescue the osteoporosis phenotype in this model of PsA. Our in vitro experiments revealed an inhibitory effect of the SCFAs on osteoclast differentiation, even at very low serum concentrations. This suppression of osteoclast differentiation enabled SCFAs to impede osteoporosis development in R26STAT3Cstopfl/fl CD4Cre mice. Further interrogation revealed that bone marrow-derived OCPs from diseased mice expressed a higher level of SCFA receptors than those of control mice and that the progenitor cells in the bone marrow of SCFA-treated mice presented a modified transcriptomic landscape, suggesting a direct impact of SCFAs on bone marrow progenitors in the context of osteoporosis. CONCLUSION We demonstrated how gut microbiota-derived SCFAs can regulate distal pathology (ie, osteoporosis) and identified a potential therapeutic option for restoring bone density in rheumatic disease, further highlighting the critical role of the gut-bone axis in these disorders.
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Affiliation(s)
| | | | | | | | - Jong Shin
- New York University Langone Health, New York City
| | - Sofia Bajwa
- New York University Langone Health, New York City
| | | | - Ken Cadwell
- New York University Langone Health, New York City, and University of Pennsylvania Perelman School of Medicine, Philadelphia
| | - Jose U Scher
- New York University Langone Health and New York University School of Medicine, New York City
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Puchner A, Simader E, Saferding V, Hofmann M, Kieler M, Brunner J, Pfeifle R, Niederreiter B, Krönke G, Schabbauer G, Georgel P, Diehl G, Steiner G, Hayer S, Redlich K, Smolen JS, Aletaha D, Blüml S. Bona fide dendritic cells are pivotal precursors for osteoclasts. Ann Rheum Dis 2024; 83:518-528. [PMID: 38071515 DOI: 10.1136/ard-2022-223817] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 11/28/2023] [Indexed: 03/14/2024]
Abstract
OBJECTIVES Osteoclasts (OCs) are myeloid-derived multinucleated cells uniquely able to degrade bone. However, the exact nature of their myeloid precursors is not yet defined. METHODS CD11c-diphtheria toxin receptor (CD11cDTR) transgenic mice were treated with diphtheria toxin (DT) or phosphate buffered saline (PBS) during serum transfer arthritis (STA) and human tumour necrosis factor transgenic (hTNFtg) arthritis and scored clinically and histologically. We measured cytokines in synovitis by quantitative polymerase chain reaction (qPCR). We performed ovariectomy in CD11cDTR mice treated with PBS or DT. We analysed CD11cDTR, CD11c-Cre/CX3CR1-STOP-DTR and Zbtb46-DTR-treated mice with DT using histomorphometry and OC of CD11c and Zbtb46 fate reporter mice by fluorescent imaging. We sorted murine and human OC precursors and stimulated them with macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor kappa-B ligand (RANKL) to generate OCs. RESULTS Targeting CD11c+ cells in vivo in models of inflammatory arthritis (STA and hTNFtg) ameliorates arthritis by reducing inflammatory bone destruction and OC generation. Targeting CD11c-expressing cells in unchallenged mice removes all OCs in their long bones. OCs do not seem to be derived from CD11c+ cells expressing CX3CR1+, but from Zbtb46+conventional dendritic cells (cDCs) as all OCs in Zbtb46-Tomato fate reporter mice are Tomato+. In line, administration of DT in Zbtb46-DTR mice depletes all OCs in long bones. Finally, human CD1c-expressing cDCs readily differentiated into bone resorbing OCs. CONCLUSION Taken together, we identify DCs as important OC precursors in bone homeostasis and inflammation, which might open new avenues for therapeutic interventions in OC-mediated diseases.
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Affiliation(s)
- Antonia Puchner
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Elisabeth Simader
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Victoria Saferding
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Vienna, Austria
| | - Melanie Hofmann
- Institute for Vascular Biology, Centre for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Markus Kieler
- Institute for Vascular Biology, Centre for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
- Christian Doppler Laboratory for Arginine Metabolism in Rheumatoid Arthritis and Multiple Sclerosis, Vienna, Austria
| | - Julia Brunner
- Institute for Vascular Biology, Centre for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
- Christian Doppler Laboratory for Arginine Metabolism in Rheumatoid Arthritis and Multiple Sclerosis, Vienna, Austria
| | - René Pfeifle
- Department of Internal Medicine 3, Friedrich Alexander University Erlangen-Nuremberg and Universitatsklinikum Erlangen, Erlangen, Germany
| | - Birgit Niederreiter
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Gerhard Krönke
- Department of Internal Medicine 3, Friedrich Alexander University Erlangen-Nuremberg and Universitatsklinikum Erlangen, Erlangen, Germany
| | - Gernot Schabbauer
- Institute for Vascular Biology, Centre for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
- Christian Doppler Laboratory for Arginine Metabolism in Rheumatoid Arthritis and Multiple Sclerosis, Vienna, Austria
| | - Philippe Georgel
- Université de Strasbourg, Faculté de Médecine, INSERM UMR_S 1109, Strasbourg, France
| | - Gretchen Diehl
- Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Guenter Steiner
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Vienna, Austria
| | - Silvia Hayer
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Kurt Redlich
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Josef S Smolen
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Daniel Aletaha
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Stephan Blüml
- Division of Rheumatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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Andreev D, Kachler K, Liu M, Chen Z, Krishnacoumar B, Ringer M, Frey S, Krönke G, Voehringer D, Schett G, Bozec A. Eosinophils preserve bone homeostasis by inhibiting excessive osteoclast formation and activity via eosinophil peroxidase. Nat Commun 2024; 15:1067. [PMID: 38316791 PMCID: PMC10844633 DOI: 10.1038/s41467-024-45261-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Accepted: 01/18/2024] [Indexed: 02/07/2024] Open
Abstract
Eosinophils are involved in tissue homeostasis. Herein, we unveiled eosinophils as important regulators of bone homeostasis. Eosinophils are localized in proximity to bone-resorbing osteoclasts in the bone marrow. The absence of eosinophils in ΔdblGATA mice results in lower bone mass under steady-state conditions and amplified bone loss upon sex hormone deprivation and inflammatory arthritis. Conversely, increased numbers of eosinophils in IL-5 transgenic mice enhance bone mass under steady-state conditions and protect from hormone- and inflammation- mediated bone loss. Eosinophils strongly inhibit the differentiation and demineralization activity of osteoclasts and lead to profound changes in the transcriptional profile of osteoclasts. This osteoclast-suppressive effect of eosinophils is based on the release of eosinophil peroxidase causing impaired reactive oxygen species and mitogen-activated protein kinase induction in osteoclast precursors. In humans, the number and the activity of eosinophils correlates with bone mass in healthy participants and rheumatoid arthritis patients. Taken together, experimental and human data indicate a regulatory function of eosinophils on bone.
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Affiliation(s)
- Darja Andreev
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany.
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany.
| | - Katerina Kachler
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Mengdan Liu
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
- Department of Rheumatology, Zhejiang University - School of Medicine, Hangzhou, China
| | - Zhu Chen
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
- Department of Rheumatology and Immunology, Anhui Medical University Affiliated Provincial Hospital, Hefei, China
| | - Brenda Krishnacoumar
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
- Institute of Physiology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Mark Ringer
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Silke Frey
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Gerhard Krönke
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
- Department of Rheumatology and Clinical Immunology, Charité University Medicine, Berlin, Germany
| | - David Voehringer
- Department of Infection Biology, FAU Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Aline Bozec
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany.
- Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany.
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Ke D, Xu H, Han J, Dai H, Wang X, Luo J, Yu Y, Xu J. Curcumin suppresses RANKL-induced osteoclast precursor autophagy in osteoclastogenesis by inhibiting RANK signaling and downstream JNK-BCL2-Beclin1 pathway. Biomed J 2024; 47:100605. [PMID: 37179010 PMCID: PMC10839592 DOI: 10.1016/j.bj.2023.100605] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 01/30/2023] [Accepted: 05/08/2023] [Indexed: 05/15/2023] Open
Abstract
BACKGROUND Curcumin ameliorates bone loss by inhibiting osteoclastogenesis. Curcumin inhibits RANKL-promoted autophagy in osteoclast precursors (OCPs), which mediates its anti-osteoclastogenic effect. But the role of RANKL signaling in curcumin-regulated OCP autophagy is unknown. This study aimed to explore the relationship between curcumin, RANKL signaling, and OCP autophagy during osteoclastogenesis. METHODS We investigated the role of curcumin in RANKL-related molecular signaling in OCPs, and identified the significance of RANK-TRAF6 signaling in curcumin-treated osteoclastogenesis and OCP autophagy using flow sorting and lentiviral transduction. Tg-hRANKL mice were used to observe the in vivo effects of curcumin on RANKL-regulated bone loss, osteoclastogenesis, and OCP autophagy. The significance of JNK-BCL2-Beclin1 pathway in curcumin-regulated OCP autophagy with RANKL was explored via rescue assays and BCL2 phosphorylation detection. RESULTS Curcumin inhibited RANKL-related molecular signaling in OCPs, and repressed osteoclast differentiation and autophagy in sorted RANK+ OCPs but did not affect those of RANK- OCPs. Curcumin-inhibited osteoclast differentiation and OCP autophagy were recovered by TRAF6 overexpression. But curcumin lost these effects under TRAF6 knockdown. Furthermore, curcumin prevented the decrease in bone mass and the increase in trabecular osteoclast formation and autophagy in RANK+ OCPs in Tg-hRANKL mice. Additionally, curcumin-inhibited OCP autophagy with RANKL was reversed by JNK activator anisomycin and TAT-Beclin1 overexpressing Beclin1. Curcumin inhibited BCL2 phosphorylation at Ser70 and enhanced protein interaction between BCL2 and Beclin1 in OCPs. CONCLUSIONS Curcumin suppresses RANKL-promoted OCP autophagy by inhibiting signaling pathway downstream of RANKL, contributing to its anti-osteoclastogenic effect. Moreover, JNK-BCL2-Beclin1 pathway plays an important role in curcumin-regulated OCP autophagy.
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Affiliation(s)
- Dianshan Ke
- Department of Orthopedics, Fujian Provincial Hospital, Fuzhou, Fujian, China; Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China
| | - Haoying Xu
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China
| | - Junyong Han
- Institute for Immunology, Fujian Academy of Medical Sciences, Fuzhou, Fujian, China
| | - Hanhao Dai
- Department of Orthopedics, Fujian Provincial Hospital, Fuzhou, Fujian, China; Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China
| | - Xinwen Wang
- Department of Orthopedics, Dongguan People's Hospital, Southern Medical University, Dongguan, Guangdong, China
| | - Jun Luo
- Department of Orthopedics, Fujian Provincial Hospital, Fuzhou, Fujian, China; Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China
| | - Yunlong Yu
- Department of Orthopedics, Fujian Provincial Hospital, Fuzhou, Fujian, China; Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China.
| | - Jie Xu
- Department of Orthopedics, Fujian Provincial Hospital, Fuzhou, Fujian, China; Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian, China.
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Sales LP, Hounkpe BW, Perez MO, Caparbo VF, Domiciano DS, Borba EF, Schett G, Figueiredo CP, Pereira RMR. Transcriptomic characterization of classical monocytes highlights the involvement of immuno-inflammation in bone erosion in Rheumatoid Arthritis. Front Immunol 2023; 14:1251034. [PMID: 37868981 PMCID: PMC10588645 DOI: 10.3389/fimmu.2023.1251034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/21/2023] [Indexed: 10/24/2023] Open
Abstract
Introduction Evidence-based data suggest that under inflammatory conditions, classical monocytes are the main source of osteoclasts and might be involved in bone erosion pathophysiology. Here, we analyze the transcriptomic profile of classical monocytes in erosive and non-erosive rheumatoid arthritis patients in order to better understand their contribution to bone erosion. Methods Thirty-nine premenopausal RA patients were consecutively enrolled and divided into two groups based on the presence of bone erosions on hand joints. Classical monocytes were isolated from peripheral blood through negative selection, and RNA-seq was performed using a poly-A enrichment kit and Illumina® platform. Classical monocytes transcriptome from healthy age-matched women were also included to identify differentially expressed genes (DEGs). Therefore, gene sets analysis was performed to identify the enriched biological pathways. Results RNA-seq analysis resulted in the identification of 1,140 DEGs of which 89 were up-regulated and 1,051 down-regulated in RA patients with bone erosion compared to those without bone erosions. Among up-regulated genes, there was a highlighted expression of IL18RAP and KLF14 related to the production of pro-inflammatory cytokines, innate and adaptive immune response. Genes related to collagen metabolism (LARP6) and bone formation process (PAPPA) were down-regulated in RA patients with erosions. Enriched pathways in patients with erosions were associated with greater activation of immune activation, and inflammation. Interestingly, pathways associated with osteoblast differentiation and regulation of Wnt signaling were less activated in RA patients with erosions. Conclusion These findings suggest that alterations in expression of monocyte genes related to the inflammatory process and impairment of bone formation might have an important role in the pathophysiology of bone erosions in RA patients.
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Affiliation(s)
- Lucas Peixoto Sales
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Bidossessi Wilfried Hounkpe
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Mariana Ortega Perez
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Valéria Falco Caparbo
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Diogo Souza Domiciano
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Eduardo Ferreira Borba
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Georg Schett
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich Alexander Universität Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Camille Pinto Figueiredo
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
| | - Rosa Maria Rodrigues Pereira
- Rheumatology Division, Bone Metabolism Laboratory, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil
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Wei S, Liu K, Wu H, Hu J, He J, Li G, Liu B, Yang W. MT2 INHIBITS OSTEOCLASTOGENESIS BY SCAVENGING ROS. ACTA ENDOCRINOLOGICA (BUCHAREST, ROMANIA : 2005) 2023; 19:447-455. [PMID: 38933247 PMCID: PMC11197834 DOI: 10.4183/aeb.2023.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
Context and objective Reactive oxygen species (ROS) produced under oxidative stress is important for osteoclastogenesis. As a major member of the metallothionein (MT) family, metallothionein2 (MT2) can scavenge ROS in osteoblasts. However, the role of MT2 in osteoclastogenesis and ROS production in osteoclast precursors (OCPs) is unknown. Material and methods In this study, we first investigated MT2 expression level in osteoporotic model mice. Next, we explored the roles of MT2 in osteoclastic differentiation and ROS production in OCPs. Ultimately, via rescue assays based on hydrogen peroxide (H2O2), the significance of ROS in MT-2-regulated osteoclastic differentiation was further elucidated. Results Compared with sham operated (Sham) mice, ovariectomized (OVX) mice displayed bone marrow primary OCPs (Ly6C+CD11b-) having higher ROS levels and lower MT2 expression. MT2 overexpression inhibited the formation of mature osteoclasts, while MT2 knockdown was contrary. Moreover, MT2 overexpression inhibited ROS production in OCPs, while MT2 knockdown exhibited the opposite effects. Notably, the inhibitory effect of MT2 overexpression on osteoclastogenesis and ROS production was blocked by the addition of H2O2. Conclusion MT2 inhibits osteoclastogenesis through repressing ROS production in OCPs, which indicates that the strategy of upregulating MT2 in OCPs may be applied to the clinical treatment of osteoclastic bone loss.
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Affiliation(s)
- S. Wei
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - K. Liu
- Fuzhou City Second Hospital, Fuzhou, China
| | - H. Wu
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - J. Hu
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - J. He
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - G. Li
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - B. Liu
- Liuzhou Workers' Hospital, Liuzhou, Guangxi
| | - W. Yang
- Fuzhou City Second Hospital, Fuzhou, China
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9
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Hascoët E, Blanchard F, Blin-Wakkach C, Guicheux J, Lesclous P, Cloitre A. New insights into inflammatory osteoclast precursors as therapeutic targets for rheumatoid arthritis and periodontitis. Bone Res 2023; 11:26. [PMID: 37217496 DOI: 10.1038/s41413-023-00257-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 03/02/2023] [Accepted: 03/09/2023] [Indexed: 05/24/2023] Open
Abstract
Rheumatoid arthritis (RA) and periodontitis are chronic inflammatory diseases leading to increased bone resorption. Preventing this inflammatory bone resorption is a major health challenge. Both diseases share immunopathogenic similarities and a common inflammatory environment. The autoimmune response or periodontal infection stimulates certain immune actors, leading in both cases to chronic inflammation that perpetuates bone resorption. Moreover, RA and periodontitis have a strong epidemiological association that could be explained by periodontal microbial dysbiosis. This dysbiosis is believed to be involved in the initiation of RA via three mechanisms. (i) The dissemination of periodontal pathogens triggers systemic inflammation. (ii) Periodontal pathogens can induce the generation of citrullinated neoepitopes, leading to the generation of anti-citrullinated peptide autoantibodies. (iii) Intracellular danger-associated molecular patterns accelerate local and systemic inflammation. Therefore, periodontal dysbiosis could promote or sustain bone resorption in distant inflamed joints. Interestingly, in inflammatory conditions, the existence of osteoclasts distinct from "classical osteoclasts" has recently been reported. They have proinflammatory origins and functions. Several populations of osteoclast precursors have been described in RA, such as classical monocytes, a dendritic cell subtype, and arthritis-associated osteoclastogenic macrophages. The aim of this review is to synthesize knowledge on osteoclasts and their precursors in inflammatory conditions, especially in RA and periodontitis. Special attention will be given to recent data related to RA that could be of potential value in periodontitis due to the immunopathogenic similarities between the two diseases. Improving our understanding of these pathogenic mechanisms should lead to the identification of new therapeutic targets involved in the pathological inflammatory bone resorption associated with these diseases.
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Affiliation(s)
- Emilie Hascoët
- Nantes Université, Oniris, Univ Angers, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, F-44000, Nantes, France
| | - Frédéric Blanchard
- Nantes Université, Oniris, Univ Angers, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, F-44000, Nantes, France
| | | | - Jérôme Guicheux
- Nantes Université, Oniris, Univ Angers, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, F-44000, Nantes, France.
| | - Philippe Lesclous
- Nantes Université, Oniris, Univ Angers, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, F-44000, Nantes, France
| | - Alexandra Cloitre
- Nantes Université, Oniris, Univ Angers, CHU Nantes, INSERM, Regenerative Medicine and Skeleton, RMeS, UMR 1229, F-44000, Nantes, France
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10
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Kaifu T, Maruhashi T, Chung SH, Shimizu K, Nakamura A, Iwakura Y. DCIR suppresses osteoclastic proliferation and resorption by downregulating M-CSF and RANKL signaling. Front Immunol 2023; 14:1159058. [PMID: 37266426 PMCID: PMC10230091 DOI: 10.3389/fimmu.2023.1159058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 05/02/2023] [Indexed: 06/03/2023] Open
Abstract
Dendritic cell immunoreceptor (DCIR) is an inhibitory C-type lectin receptor that acts as a negative regulator in the immune system and bone metabolism. We previously revealed that DCIR deficiency enhanced osteoclastogenesis and antigen presentation of dendritic cells, and that asialo-biantennary N-glycan (NA2) functions as a ligand for DCIR. NA2 binding to DCIR suppressed murine and human osteoclastogenesis that occurs in the presence of M-CSF and RANKL. The DCIR-NA2 axis, therefore, plays an important role in regulating osteoclastogenesis in both mice and humans, although the underlying mechanisms remain unclear. Here we found that Dcir -/- bone marrow-derived macrophages (BMMs) exhibited greater proliferative and differentiation responses to M-CSF and RANKL, respectively, than wild-type (WT) BMMs. Moreover, Dcir -/- osteoclasts (OCs) increased resorptive activity and cell fusion more significantly than WT OCs. DCIR deficiency affects gene expression patterns in OCs, and we found that the expression of neuraminidase 4 was increased in Dcir -/- OCs. Furthermore, DCIR-NA2 interaction in WT BMMs, but not Dcir -/- BMMs, decreased Akt phosphorylation in response to M-CSF and RANKL. These data suggest that DCIR regulates osteoclastogenesis by downregulating M-CSF and RANKL signaling, and that DCIR-mediated signaling may contribute to the terminal modification of oligosaccharides by controlling the expression of glycosylation enzymes.
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Affiliation(s)
- Tomonori Kaifu
- Division of Immunology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, Japan
| | - Takumi Maruhashi
- Laboratory of Molecular Immunology, Institute for Quantitative Biosciences, The University of Tokyo, Tokyo, Japan
| | - Soo-Hyun Chung
- Center for Animal Disease Models, Research Institution for Biological Sciences, Tokyo University of Science, Noda, Chiba, Japan
| | - Kenji Shimizu
- Laboratory of Molecular Immunology, Institute for Quantitative Biosciences, The University of Tokyo, Tokyo, Japan
| | - Akira Nakamura
- Division of Immunology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, Japan
| | - Yoichiro Iwakura
- Center for Animal Disease Models, Research Institution for Biological Sciences, Tokyo University of Science, Noda, Chiba, Japan
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11
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Tsai J, Kaneko K, Suh AJ, Bockman R, Park-Min KH. Origin of Osteoclasts: Osteoclast Precursor Cells. J Bone Metab 2023; 30:127-140. [PMID: 37449346 PMCID: PMC10346003 DOI: 10.11005/jbm.2023.30.2.127] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/27/2023] [Accepted: 04/27/2023] [Indexed: 07/18/2023] Open
Abstract
Osteoclasts are multinucleated bone-resorbing cells and a key player in bone remodeling for health and disease. Since the discovery of osteoclasts in 1873, the structure and function of osteoclasts and the molecular and cellular mechanisms of osteoclastogenesis have been extensively studied. Moreover, it has been well established that osteoclasts are differentiated in vitro from myeloid cells such as bone marrow macrophages or monocytes. The concept showing that osteoclasts are derived from a specific population (named osteoclast precursor cells [OCPs]) among myeloid cells has been long hypothesized. However, the specific precursor population of osteoclasts is not clearly defined yet. A growing body of work provides evidence of the developmental origin and lifespan of murine osteoclasts, particularly in vivo. Here, we review the emerging evidence that supports the existence of OCPs and discuss current insights into their identity.
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Affiliation(s)
- Jefferson Tsai
- Arthritis and Tissue Degeneration Program, David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY,
USA
| | - Kaichi Kaneko
- Division of Rheumatology, Department of Internal Medicine, Toho University Sakura Medical Center, Chiba,
Japan
| | - Andrew J. Suh
- Arthritis and Tissue Degeneration Program, David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY,
USA
| | - Richard Bockman
- Division of Endocrinology and Metabolism, Hospital for Special Surgery, New York, NY,
USA
- Department of Medicine, Weill Cornell Medical College, New York, NY,
USA
| | - Kyung-Hyun Park-Min
- Arthritis and Tissue Degeneration Program, David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY,
USA
- Department of Medicine, Weill Cornell Medical College, New York, NY,
USA
- BCMB Allied Program, Weill Cornell Graduate School of Medical Sciences, New York, NY,
USA
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12
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Chen M, Fu W, Xu H, Liu CJ. Pathogenic mechanisms of glucocorticoid-induced osteoporosis. Cytokine Growth Factor Rev 2023; 70:54-66. [PMID: 36906448 PMCID: PMC10518688 DOI: 10.1016/j.cytogfr.2023.03.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/21/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023]
Abstract
Glucocorticoid (GC) is one of the most prescribed medicines to treat various inflammatory and autoimmune diseases. However, high doses and long-term use of GCs lead to multiple adverse effects, particularly glucocorticoid-induced osteoporosis (GIO). Excessive GCs exert detrimental effects on bone cells, including osteoblasts, osteoclasts, and osteocytes, leading to impaired bone formation and resorption. The actions of exogenous GCs are considered to be strongly cell-type and dose dependent. GC excess inhibits the proliferation and differentiation of osteoblasts and enhances the apoptosis of osteoblasts and osteocytes, eventually contributing to reduced bone formation. Effects of GC excess on osteoclasts mainly include enhanced osteoclastogenesis, increased lifespan and number of mature osteoclasts, and diminished osteoclast apoptosis, which result in increased bone resorption. Furthermore, GCs have an impact on the secretion of bone cells, subsequently disturbing the process of osteoblastogenesis and osteoclastogenesis. This review provides timely update and summary of recent discoveries in the field of GIO, with a particular focus on the effects of exogenous GCs on bone cells and the crosstalk among them under GC excess.
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Affiliation(s)
- Meng Chen
- Department of Orthopaedic Surgery, New York University Grossman School of Medicine, New York, NY, USA; School of Life Sciences, Northwestern Polytechnical University, Xi'an, China
| | - Wenyu Fu
- Department of Orthopaedic Surgery, New York University Grossman School of Medicine, New York, NY, USA
| | - Huiyun Xu
- School of Life Sciences, Northwestern Polytechnical University, Xi'an, China.
| | - Chuan-Ju Liu
- Department of Orthopaedic Surgery, New York University Grossman School of Medicine, New York, NY, USA; Department of Cell Biology, New York University Grossman School of Medicine, New York, NY, USA.
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13
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Weivoda MM, Bradley EW. Macrophages and Bone Remodeling. J Bone Miner Res 2023; 38:359-369. [PMID: 36651575 PMCID: PMC10023335 DOI: 10.1002/jbmr.4773] [Citation(s) in RCA: 25] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 01/05/2023] [Accepted: 01/10/2023] [Indexed: 01/19/2023]
Abstract
Bone remodeling in the adult skeleton facilitates the removal and replacement of damaged and old bone to maintain bone quality. Tight coordination of bone resorption and bone formation during remodeling crucially maintains skeletal mass. Increasing evidence suggests that many cell types beyond osteoclasts and osteoblasts support bone remodeling, including macrophages and other myeloid lineage cells. Herein, we discuss the origin and functions for macrophages in the bone microenvironment, tissue resident macrophages, osteomacs, as well as newly identified osteomorphs that result from osteoclast fission. We also touch on the role of macrophages during inflammatory bone resorption. © 2023 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
| | - Elizabeth W. Bradley
- Department of Orthopedics and Stem Cell Institute, University of Minnesota, Minneapolis, MN
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14
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Sun J, Wang W, Hu X, Zhang X, Zhu C, Hu J, Ma R. Local delivery of gaseous signaling molecules for orthopedic disease therapy. J Nanobiotechnology 2023; 21:58. [PMID: 36810201 PMCID: PMC9942085 DOI: 10.1186/s12951-023-01813-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 02/13/2023] [Indexed: 02/24/2023] Open
Abstract
Over the past decade, a proliferation of research has used nanoparticles to deliver gaseous signaling molecules for medical purposes. The discovery and revelation of the role of gaseous signaling molecules have been accompanied by nanoparticle therapies for their local delivery. While most of them have been applied in oncology, recent advances have demonstrated their considerable potential in diagnosing and treating orthopedic diseases. Three of the currently recognized gaseous signaling molecules, nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S), are highlighted in this review along with their distinctive biological functions and roles in orthopedic diseases. Moreover, this review summarizes the progress in therapeutic development over the past ten years with a deeper discussion of unresolved issues and potential clinical applications.
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Affiliation(s)
- Jiaxuan Sun
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Wenzhi Wang
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Xianli Hu
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Xianzuo Zhang
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Chen Zhu
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China.
| | - Jinming Hu
- Department of Pharmacy, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230001, Anhui, China.
| | - Ruixiang Ma
- Department of Orthopedics, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China.
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15
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Ren Y, Bäcker H, Müller M, Kienzle A. The role of myeloid derived suppressor cells in musculoskeletal disorders. Front Immunol 2023; 14:1139683. [PMID: 36936946 PMCID: PMC10020351 DOI: 10.3389/fimmu.2023.1139683] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 02/21/2023] [Indexed: 03/06/2023] Open
Abstract
The immune system is closely linked to bone homeostasis and plays a pivotal role in several pathological and inflammatory conditions. Through various pathways it modulates various bone cells and subsequently sustains the physiological bone metabolism. Myeloid-derived suppressor cells (MDSCs) are a group of heterogeneous immature myeloid-derived cells that can exert an immunosuppressive function through a direct cell-to-cell contact, secretion of anti-inflammatory cytokines or specific exosomes. These cells mediate the innate immune response to chronic stress on the skeletal system. In chronic inflammation, MDSCs act as an inner offset to rebalance overactivation of the immune system. Moreover, they have been found to be involved in processes responsible for bone remodeling in different musculoskeletal disorders, autoimmune diseases, infection, and cancer. These cells can not only cause bone erosion by differentiating into osteoclasts, but also alleviate the immune reaction, subsequently leading to long-lastingly impacted bone remodeling. In this review, we discuss the impact of MDSCs on the bone metabolism under several pathological conditions, the involved modulatory pathways as well as potential therapeutic targets in MDSCs to improve bone health.
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Affiliation(s)
- Yi Ren
- Center for Musculoskeletal Surgery, Clinic for Orthopedics, Charité University Hospital, Berlin, Germany
| | - Henrik Bäcker
- Department of Orthopedics, Auckland City Hospital, Auckland, New Zealand
| | - Michael Müller
- Center for Musculoskeletal Surgery, Clinic for Orthopedics, Charité University Hospital, Berlin, Germany
| | - Arne Kienzle
- Center for Musculoskeletal Surgery, Clinic for Orthopedics, Charité University Hospital, Berlin, Germany
- BIH Charité Clinician Scientist Program, BIH Biomedical Innovation Academy, Berlin Institute of Health, Charité — Universitätsmedizin Berlin, Berlin, Germany
- *Correspondence: Arne Kienzle,
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16
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Kubatzky KF. Pasteurella multocida toxin - lessons learned from a mitogenic toxin. Front Immunol 2022; 13:1058905. [PMID: 36591313 PMCID: PMC9800868 DOI: 10.3389/fimmu.2022.1058905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/29/2022] [Indexed: 12/23/2022] Open
Abstract
The gram-negative, zoonotic bacterium Pasteurella multocida was discovered in 1880 and found to be the causative pathogen of fowl cholera. Pasteurella-related diseases can be found in domestic and wild life animals such as buffalo, sheep, goat, deer and antelope, cats, dogs and tigers and cause hemorrhagic septicemia in cattle, rhinitis or pneumonia in rabbits or fowl cholera in poultry and birds. Pasteurella multocida does not play a major role in the immune-competent human host, but can be found after animal bites or in people with close contact to animals. Toxigenic strains are most commonly found in pigs and express a phage-encoded 146 kDa protein, the Pasteurella multocida toxin (PMT). Toxin-expressing strains cause atrophic rhinitis where nasal turbinate bones are destroyed through the inhibition of bone building osteoblasts and the activation of bone resorbing osteoclasts. After its uptake through receptor-mediated endocytosis, PMT specifically targets the alpha subunit of several heterotrimeric G proteins and constitutively activates them through deamidation of a glutamine residue to glutamate in the alpha subunit. This results in cytoskeletal rearrangement, proliferation, differentiation and survival of cells. Because of the toxin's mitogenic effects, it was suggested that it might have carcinogenic properties, however, no link between Pasteurella infections and cell transformation could be established, neither in tissue culture models nor through epidemiological data. In the recent years it was shown that the toxin not only affects bone, but also the heart as well as basically all cells of innate and adaptive immunity. During the last decade the focus of research shifted from signal transduction processes to understanding how the bacteria might benefit from a bone-destroying toxin. The primary function of PMT seems to be the modulation of immune cell activation which at the same time creates an environment permissive for osteoclast formation. While the disease is restricted to pigs, the implications of the findings from PMT research can be used to explore human diseases and have a high translational potential. In this review our current knowledge will be summarized and it will be discussed what can be learned from using PMT as a tool to understand human pathologies.
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Affiliation(s)
- Katharina F. Kubatzky
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University, Heidelberg, Germany
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17
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Zou L, Jiang W, Wang Z, Zhu S, Chen J. Effect of Advanced Oxidation Protein Products (AOPPs) and aging on the osteoclast differentiation of Myeloid-Derived Suppressor Cells (MDSCs) and its preliminary mechanism. Biochem Biophys Res Commun 2022; 636:87-96. [DOI: 10.1016/j.bbrc.2022.10.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/09/2022] [Accepted: 10/18/2022] [Indexed: 11/28/2022]
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Abstract
Osteoclasts, the only cells that can resorb bone, play a central role in bone homeostasis as well as bone damage under pathological conditions such as osteoporosis, arthritis, periodontitis, and bone metastasis. Recent studies using single-cell technologies have uncovered the regulatory mechanisms underlying osteoclastogenesis at unprecedented resolution and shed light on the possibility that there is heterogeneity in the origin, function, and fate of osteoclast-lineage cells. Here, we discuss the current advances and emerging concepts in osteoclast biology.
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19
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Andreev D, Kachler K, Schett G, Bozec A. Rheumatoid arthritis and osteoimmunology: The adverse impact of a deregulated immune system on bone metabolism. Bone 2022; 162:116468. [PMID: 35688359 DOI: 10.1016/j.bone.2022.116468] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/30/2022] [Accepted: 06/06/2022] [Indexed: 11/20/2022]
Abstract
The term osteoimmunology describes an interdisciplinary research field that links the investigation of osteology (bone cells) with immunology. The crosstalk between innate and adaptive immune cells and cells involved in bone remodeling, mainly bone-resorbing osteoclasts and bone-forming osteoblasts, becomes particularly obvious in the inflammatory autoimmune disease rheumatoid arthritis (RA). Besides striking inflammation of the joints, RA causes bone loss, leading to joint damage and disabilities as well as generalized osteoporosis. Mechanistically, RA-associated immune cells (macrophages, T cells, B cells etc.) produce high levels of pro-inflammatory cytokines, receptor activator of nuclear factor κB ligand (RANKL) and autoantibodies that promote bone degradation and at the same time counteract new bone formation. Today, antirheumatic therapy effectively ceases joint inflammation and arrests bone erosion. However, the repair of established bone lesions still presents a challenging task and requires improved treatment options. In this review, we outline the knowledge gained over the past years about the immunopathogenesis of RA and the impact of a dysregulated immune system on bone metabolism.
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Affiliation(s)
- Darja Andreev
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, Erlangen, Germany; Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Katerina Kachler
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, Erlangen, Germany; Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany.
| | - Georg Schett
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, Erlangen, Germany; Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany
| | - Aline Bozec
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, Erlangen, Germany; Deutsches Zentrum für Immuntherapie (DZI), Erlangen, Germany.
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20
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Mangini M, D’Angelo R, Vinciguerra C, Payré C, Lambeau G, Balestrieri B, Charles JF, Mariggiò S. Multimodal regulation of the osteoclastogenesis process by secreted group IIA phospholipase A 2. Front Cell Dev Biol 2022; 10:966950. [PMID: 36105351 PMCID: PMC9467450 DOI: 10.3389/fcell.2022.966950] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 07/25/2022] [Indexed: 01/21/2023] Open
Abstract
Increasing evidence points to the involvement of group IIA secreted phospholipase A2 (sPLA2-IIA) in pathologies characterized by abnormal osteoclast bone-resorption activity. Here, the role of this moonlighting protein has been deepened in the osteoclastogenesis process driven by the RANKL cytokine in RAW264.7 macrophages and bone-marrow derived precursor cells from BALB/cJ mice. Inhibitors with distinct selectivity toward sPLA2-IIA activities and recombinant sPLA2-IIA (wild-type or catalytically inactive forms, full-length or partial protein sequences) were instrumental to dissect out sPLA2-IIA function, in conjunction with reduction of sPLA2-IIA expression using small-interfering-RNAs and precursor cells from Pla2g2a knock-out mice. The reported data indicate sPLA2-IIA participation in murine osteoclast maturation, control of syncytium formation and resorbing activity, by mechanisms that may be both catalytically dependent and independent. Of note, these studies provide a more complete understanding of the still enigmatic osteoclast multinucleation process, a crucial step for bone-resorbing activity, uncovering the role of sPLA2-IIA interaction with a still unidentified receptor to regulate osteoclast fusion through p38 SAPK activation. This could pave the way for the design of specific inhibitors of sPLA2-IIA binding to interacting partners implicated in osteoclast syncytium formation.
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Affiliation(s)
- Maria Mangini
- Institute of Protein Biochemistry, National Research Council, Naples, Italy
| | - Rosa D’Angelo
- Institute of Protein Biochemistry, National Research Council, Naples, Italy
| | - Caterina Vinciguerra
- Institute of Biochemistry and Cell Biology, National Research Council, Naples, Italy
| | - Christine Payré
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, Valbonne Sophia Antipolis, France
| | - Gérard Lambeau
- Centre National de la Recherche Scientifique, Institut de Pharmacologie Moléculaire et Cellulaire, Université Côte d’Azur, Valbonne Sophia Antipolis, France
| | - Barbara Balestrieri
- Jeff and Penny Vinik Center for Translational Immunology Research, Department of Medicine, Division of Allergy and Clinical Immunology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - Julia F. Charles
- Departments of Orthopaedic Surgery and Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - Stefania Mariggiò
- Institute of Protein Biochemistry, National Research Council, Naples, Italy,*Correspondence: Stefania Mariggiò,
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21
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Peek CT, Ford CA, Eichelberger KR, Jacobse J, Torres TP, Maseda D, Latour YL, Piazuelo MB, Johnson JR, Byndloss MX, Wilson KT, Rathmell JC, Goettel JA, Cassat JE. Intestinal Inflammation Promotes MDL-1 + Osteoclast Precursor Expansion to Trigger Osteoclastogenesis and Bone Loss. Cell Mol Gastroenterol Hepatol 2022; 14:731-750. [PMID: 35835390 PMCID: PMC9420375 DOI: 10.1016/j.jcmgh.2022.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 07/01/2022] [Accepted: 07/05/2022] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS Inflammatory bowel disease (IBD) is characterized by severe gastrointestinal inflammation, but many patients experience extra-intestinal disease. Bone loss is one common extra-intestinal manifestation of IBD that occurs through dysregulated interactions between osteoclasts and osteoblasts. Systemic inflammation has been postulated to contribute to bone loss, but the specific pathologic mechanisms have not yet been fully elucidated. We hypothesized that intestinal inflammation leads to bone loss through increased abundance and altered function of osteoclast progenitors. METHODS We used chemical, T cell driven, and infectious models of intestinal inflammation to determine the impact of intestinal inflammation on bone volume, the skeletal cytokine environment, and the cellular changes to pre-osteoclast populations within bone marrow. Additionally, we evaluated the potential for monoclonal antibody treatment against an inflammation-induced osteoclast co-receptor, myeloid DNAX activation protein 12-associating lectin-1 (MDL-1) to reduce bone loss during colitis. RESULTS We observed significant bone loss across all models of intestinal inflammation. Bone loss was associated with an increase in pro-osteoclastogenic cytokines within the bone and an expansion of a specific Cd11b-/loLy6Chi osteoclast precursor (OCP) population. Intestinal inflammation led to altered OCP expression of surface receptors involved in osteoclast differentiation and function, including the pro-osteoclastogenic co-receptor MDL-1. OCPs isolated from mice with intestinal inflammation demonstrated enhanced osteoclast differentiation ex vivo compared to controls, which was abrogated by anti-MDL-1 antibody treatment. Importantly, in vivo anti-MDL-1 antibody treatment ameliorated bone loss during intestinal inflammation. CONCLUSIONS Collectively, these data implicate the pathologic expansion and altered function of OCPs expressing MDL-1 in bone loss during IBD.
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Affiliation(s)
- Christopher T Peek
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Caleb A Ford
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee
| | - Kara R Eichelberger
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Justin Jacobse
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Teresa P Torres
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Damian Maseda
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Yvonne L Latour
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - M Blanca Piazuelo
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; Center for Mucosal Inflammation and Cancer, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Joshua R Johnson
- Vanderbilt Center for Bone Biology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Mariana X Byndloss
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Keith T Wilson
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, Tennessee; Center for Mucosal Inflammation and Cancer, Vanderbilt University Medical Center, Nashville, Tennessee; Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee
| | - Jeffrey C Rathmell
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, Tennessee; Center for Mucosal Inflammation and Cancer, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Center for Immunobiology, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Jeremy A Goettel
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, Tennessee; Center for Mucosal Inflammation and Cancer, Vanderbilt University Medical Center, Nashville, Tennessee
| | - James E Cassat
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee; Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee; Department of Pediatrics, Division of Pediatric Infectious Diseases, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Institute for Infection, Immunology, and Inflammation, Vanderbilt University Medical Center, Nashville, Tennessee; Center for Mucosal Inflammation and Cancer, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Center for Immunobiology, Vanderbilt University Medical Center, Nashville, Tennessee; Vanderbilt Center for Bone Biology, Vanderbilt University Medical Center, Nashville, Tennessee.
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22
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Liu P, Gao Y, Luo P, Yu H, Guo S, Liu F, Gao J, Xu J, Wang S, Zhang C. Glucocorticoid-induced expansion of classical monocytes contributes to bone loss. Exp Mol Med 2022; 54:765-776. [PMID: 35672449 PMCID: PMC9256622 DOI: 10.1038/s12276-022-00764-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 12/24/2021] [Accepted: 12/27/2021] [Indexed: 12/19/2022] Open
Abstract
Classical monocytes are commonly involved in the innate inflammatory response and are the progenitors of osteoclasts. Excess endogenous glucocorticoids (GCs) can increase the levels of classical monocytes in blood and bone marrow. The role of this cell population in high-dose exogenous GC-induced osteoporosis (GIOP) remains to be elucidated. In this study, GIOP was established in rats and mice by daily methylprednisolone injection, and monocyte subsets were analyzed by flow cytometry. We demonstrated that classical monocytes accumulate in bone marrow during GIOP. Similarly, the monocyte proportion among bone marrow nucleated cells was also increased in patients with steroid treatment history. We sorted classical monocytes and analyzed their transcriptional profile in response to GCs by RNA sequencing. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis showed that classical monocytes isolated from GC-treated rats exhibited osteoclast differentiation potential. Deletion of classical monocytes by clodronate liposome treatment prevented GIOP via inhibition of osteoclastogenesis and restoration of CD31HiendomucinHi vessels. Regarding the molecular mechanism, classical monocytes express high levels of glucocorticoid receptors. In vitro treatment with GCs increased both the percentage and absolute number of monocytes and promoted their proliferation. In summary, classical monocytes mediated GC-induced bone loss and are a potential target for therapeutic intervention in GIOP treatment.
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Affiliation(s)
- Pei Liu
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Youshui Gao
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Pengbo Luo
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Hongping Yu
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Shang Guo
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Fuyun Liu
- Department of Orthopedic Surgery, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Junjie Gao
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China
| | - Jianzhong Xu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, Henan, China.
| | - Shengdian Wang
- CAS Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, China.
| | - Changqing Zhang
- Department of Orthopedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, 200233, Shanghai, China.
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23
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Ding P, Tan Q, Wei Z, Chen Q, Wang C, Qi L, Wen L, Zhang C, Yao C. Toll-like receptor 9 deficiency induces osteoclastic bone loss via gut microbiota-associated systemic chronic inflammation. Bone Res 2022; 10:42. [PMID: 35624094 PMCID: PMC9142495 DOI: 10.1038/s41413-022-00210-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 02/06/2022] [Accepted: 03/13/2022] [Indexed: 02/08/2023] Open
Abstract
Toll-like receptors (TLRs) play pivotal roles in inflammation and provide important links between the immune and skeletal systems. Although the activation of TLRs may affect osteoclast differentiation and bone metabolism, whether and how TLRs are required for normal bone remodeling remains to be fully explored. In the current study, we show for the first time that TLR9-/- mice exhibit a low bone mass and low-grade systemic chronic inflammation, which is characterized by the expansion of CD4+ T cells and increased levels of inflammatory cytokines, including TNFα, RANKL, and IL1β. The increased levels of these cytokines significantly promote osteoclastogenesis and induce bone loss. Importantly, TLR9 deletion alters the gut microbiota, and this dysbiosis is the basis of the systemic inflammation and bone loss observed in TLR9-/- mice. Furthermore, through single-cell RNA sequencing, we identified myeloid-biased hematopoiesis in the bone marrow of TLR9-/- mice and determined that the increase in myelopoiesis, likely caused by the adaptation of hematopoietic stem cells to systemic inflammation, also contributes to inflammation-induced osteoclastogenesis and subsequent bone loss in TLR9-/- mice. Thus, our study provides novel evidence that TLR9 signaling connects the gut microbiota, immune system, and bone and is critical in maintaining the homeostasis of inflammation, hematopoiesis, and bone metabolism under normal conditions.
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Affiliation(s)
- Peng Ding
- Department of Orthopedic Surgery, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China
| | - Qiyuan Tan
- Department of Endocrinology and Metabolism, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China
| | - Zhanying Wei
- Department of Osteoporosis and Skeletal Disorders, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China
| | - Qiyu Chen
- Department of Orthopedic Surgery, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China
| | - Chun Wang
- Department of Osteoporosis and Skeletal Disorders, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China
| | - Luyue Qi
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Li Wen
- Section of Endocrinology, Department of Internal Medicine, Yale University School of Medicine, New Haven, USA
| | - Changqing Zhang
- Department of Orthopedic Surgery, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China.
| | - Chen Yao
- Department of Orthopedic Surgery, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, China.
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24
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Baratchart E, Lo CH, Lynch CC, Basanta D. Integrated computational and in vivo models reveal Key Insights into macrophage behavior during bone healing. PLoS Comput Biol 2022; 18:e1009839. [PMID: 35559958 PMCID: PMC9106165 DOI: 10.1371/journal.pcbi.1009839] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 01/17/2022] [Indexed: 11/24/2022] Open
Abstract
Myeloid-derived monocyte and macrophages are key cells in the bone that contribute to remodeling and injury repair. However, their temporal polarization status and control of bone-resorbing osteoclasts and bone-forming osteoblasts responses is largely unknown. In this study, we focused on two aspects of monocyte/macrophage dynamics and polarization states over time: 1) the injury-triggered pro- and anti-inflammatory monocytes/macrophages temporal profiles, 2) the contributions of pro- versus anti-inflammatory monocytes/macrophages in coordinating healing response. Bone healing is a complex multicellular dynamic process. While traditional in vitro and in vivo experimentation may capture the behavior of select populations with high resolution, they cannot simultaneously track the behavior of multiple populations. To address this, we have used an integrated coupled ordinary differential equations (ODEs)-based framework describing multiple cellular species to in vivo bone injury data in order to identify and test various hypotheses regarding bone cell populations dynamics. Our approach allowed us to infer several biological insights including, but not limited to,: 1) anti-inflammatory macrophages are key for early osteoclast inhibition and pro-inflammatory macrophage suppression, 2) pro-inflammatory macrophages are involved in osteoclast bone resorptive activity, whereas osteoblasts promote osteoclast differentiation, 3) Pro-inflammatory monocytes/macrophages rise during two expansion waves, which can be explained by the anti-inflammatory macrophages-mediated inhibition phase between the two waves. In addition, we further tested the robustness of the mathematical model by comparing simulation results to an independent experimental dataset. Taken together, this novel comprehensive mathematical framework allowed us to identify biological mechanisms that best recapitulate bone injury data and that explain the coupled cellular population dynamics involved in the process. Furthermore, our hypothesis testing methodology could be used in other contexts to decipher mechanisms in complex multicellular processes. Myeloid-derived monocytes/macrophages are key cells for bone remodeling and injury repair. However, their temporal polarization status and control of bone-resorbing osteoclasts and bone-forming osteoblasts responses is largely unknown. In this study, we focused on two aspects of monocyte/macrophage population dynamics: 1) the injury-triggered pro- and anti-inflammatory monocytes/macrophages temporal profiles, 2) the contributions of pro- versus anti-inflammatory monocytes/macrophages in coordinating healing response. In order to test various hypotheses regarding bone cell populations dynamics, we have integrated a coupled ordinary differential equations-based framework describing multiple cellular species to in vivo bone injury data. Our approach allowed us to infer several biological insights including: 1) anti-inflammatory macrophages are key for early osteoclast inhibition and pro-inflammatory macrophage suppression, 2) pro-inflammatory macrophages are involved in osteoclast bone resorptive activity, whereas osteoblasts promote osteoclast differentiation, 3) Pro-inflammatory monocytes/macrophages rise during two expansion waves, which can be explained by the anti-inflammatory macrophages-mediated inhibition phase between the two waves. Taken together, this mathematical framework allowed us to identify biological mechanisms that recapitulate bone injury data and that explain the coupled cellular population dynamics involved in the process.
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Affiliation(s)
- Etienne Baratchart
- Integrated Mathematical Oncology Department, SRB4, Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America
| | - Chen Hao Lo
- Cancer Biology Ph.D. Program, Department of Cell Biology Microbiology and Molecular Biology, University of South Florida, Tampa, Florida, United States of America
- Tumor Biology Department, SRB3, Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America
| | - Conor C. Lynch
- Cancer Biology Ph.D. Program, Department of Cell Biology Microbiology and Molecular Biology, University of South Florida, Tampa, Florida, United States of America
- * E-mail: (CL); (DB)
| | - David Basanta
- Integrated Mathematical Oncology Department, SRB4, Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America
- * E-mail: (CL); (DB)
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25
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Yahara Y, Nguyen T, Ishikawa K, Kamei K, Alman BA. The origins and roles of osteoclasts in bone development, homeostasis and repair. Development 2022; 149:275249. [PMID: 35502779 PMCID: PMC9124578 DOI: 10.1242/dev.199908] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The mechanisms underlying bone development, repair and regeneration are reliant on the interplay and communication between osteoclasts and other surrounding cells. Osteoclasts are multinucleated monocyte lineage cells with resorptive abilities, forming the bone marrow cavity during development. This marrow cavity, essential to hematopoiesis and osteoclast-osteoblast interactions, provides a setting to investigate the origin of osteoclasts and their multi-faceted roles. This Review examines recent developments in the embryonic understanding of osteoclast origin, as well as interactions within the immune environment to regulate normal and pathological bone development, homeostasis and repair.
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Affiliation(s)
- Yasuhito Yahara
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, United States.,Department of Molecular and Medical Pharmacology, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan.,Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Tuyet Nguyen
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, United States.,Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, United States
| | - Koji Ishikawa
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, United States.,Department of Orthopaedic Surgery, Showa University School of Medicine, Tokyo, 142-8666, Japan
| | - Katsuhiko Kamei
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Toyama, Toyama, 930-0194, Japan
| | - Benjamin A Alman
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, United States.,Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, United States
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26
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Specific inflammatory osteoclast precursors induced during chronic inflammation give rise to highly active osteoclasts associated with inflammatory bone loss. Bone Res 2022; 10:36. [PMID: 35396510 PMCID: PMC8993801 DOI: 10.1038/s41413-022-00206-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/12/2021] [Accepted: 01/17/2022] [Indexed: 12/17/2022] Open
Abstract
Elevated osteoclast (OC) activity is a major contributor to inflammatory bone loss (IBL) during chronic inflammatory diseases. However, the specific OC precursors (OCPs) responding to inflammatory cues and the underlying mechanisms leading to IBL are poorly understood. We identified two distinct OCP subsets: Ly6ChiCD11bhi inflammatory OCPs (iOCPs) induced during chronic inflammation, and homeostatic Ly6ChiCD11blo OCPs (hOCPs) which remained unchanged. Functional and proteomic characterization revealed that while iOCPs were rare and displayed low osteoclastogenic potential under normal conditions, they expanded during chronic inflammation and generated OCs with enhanced activity. In contrast, hOCPs were abundant and manifested high osteoclastogenic potential under normal conditions but generated OCs with low activity and were unresponsive to the inflammatory environment. Osteoclasts derived from iOCPs expressed higher levels of resorptive and metabolic proteins than those generated from hOCPs, highlighting that different osteoclast populations are formed by distinct precursors. We further identified the TNF-α and S100A8/A9 proteins as key regulators that control the iOCP response during chronic inflammation. Furthermore, we demonstrated that the response of iOCPs but not that of hOCPs was abrogated in tnf-α-/- mice, in correlation with attenuated IBL. Our findings suggest a central role for iOCPs in IBL induction. iOCPs can serve as potential biomarkers for IBL detection and possibly as new therapeutic targets to combat IBL in a wide range of inflammatory conditions.
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27
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Hasegawa T, Ishii M. Pathological Osteoclasts and Precursor Macrophages in Inflammatory Arthritis. Front Immunol 2022; 13:867368. [PMID: 35464401 PMCID: PMC9024112 DOI: 10.3389/fimmu.2022.867368] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 03/18/2022] [Indexed: 01/10/2023] Open
Abstract
Macrophages comprise a variety of subsets with diverse biological functions, including inflammation, tissue repair, regeneration, and fibrosis. In the bone marrow, macrophages differentiate into multinucleated osteoclasts, which have a unique bone-destroying capacity and play key roles in physiological bone remodelling. In contrast, osteoclasts are also involved in inflammatory bone erosion in arthritis and it has been unclear whether the osteoclasts in different tissue settings arise from similar monocytoid precursors and share similar phenotypes. Rapid progresses in the sequencing technologies have provided many important insights regarding the heterogeneity of different types of osteoclasts. The application of single-cell RNA sequencing (scRNA-seq) to the osteoclast precursor-containing macrophages enabled to identify the specific subpopulation differentiating into pathological mature osteoclasts in joints. Furthermore, an intravital imaging technology using two-photon microscopy has succeeded in visualizing the real-time dynamics of immune cells in the synovial microenvironment. These technologies together contributed to characterize the unique macrophages in the inflamed synovium, termed “arthritis-associated osteoclastogenic macrophages (AtoMs)”, causing the pathological bone destruction in inflammatory arthritis. Here, we review and discuss how novel technologies help to better understand the role of macrophages in inflammatory arthritis, especially focusing of osteoclastogenesis at the pannus-bone interface.
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Affiliation(s)
- Tetsuo Hasegawa
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan
- Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan
- World Premier International Research Center Initiative (WPI)-Immunology Frontier Research Center, Osaka University, Osaka, Japan
- Laboratory of Bioimaging and Drug Discovery, National Institutes of Biomedical Innovation, Health and Nutrition, Osaka, Japan
- *Correspondence: Masaru Ishii,
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28
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Zhang W, Gao R, Rong X, Zhu S, Cui Y, Liu H, Li M. Immunoporosis: Role of immune system in the pathophysiology of different types of osteoporosis. Front Endocrinol (Lausanne) 2022; 13:965258. [PMID: 36147571 PMCID: PMC9487180 DOI: 10.3389/fendo.2022.965258] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 08/22/2022] [Indexed: 11/13/2022] Open
Abstract
Osteoporosis is a skeletal system disease characterized by low bone mass and altered bone microarchitecture, with an increased risk of fractures. Classical theories hold that osteoporosis is essentially a bone remodeling disorder caused by estrogen deficiency/aging (primary osteoporosis) or secondary to diseases/drugs (secondary osteoporosis). However, with the in-depth understanding of the intricate nexus between both bone and the immune system in recent decades, the novel field of "Immunoporosis" was proposed by Srivastava et al. (2018, 2022), which delineated and characterized the growing importance of immune cells in osteoporosis. This review aimed to summarize the response of the immune system (immune cells and inflammatory factors) in different types of osteoporosis. In postmenopausal osteoporosis, estrogen deficiency-mediated alteration of immune cells stimulates the activation of osteoclasts in varying degrees. In senile osteoporosis, aging contributes to continuous activation of the immune system at a low level which breaks immune balance, ultimately resulting in bone loss. Further in diabetic osteoporosis, insulin deficiency or resistance-induced hyperglycemia could lead to abnormal regulation of the immune cells, with excessive production of proinflammatory factors, resulting in osteoporosis. Thus, we reviewed the pathophysiology of osteoporosis from a novel insight-immunoporosis, which is expected to provide a specific therapeutic target for different types of osteoporosis.
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Affiliation(s)
- Weidong Zhang
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
| | - Ruihan Gao
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
| | - Xing Rong
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
| | - Siqi Zhu
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
- Affiliated Hospital 2, Jinzhou Medical University, Jinzhou, China
| | - Yajun Cui
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
| | - Hongrui Liu
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
- *Correspondence: Minqi Li, ; Hongrui Liu,
| | - Minqi Li
- Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Department of Bone Metabolism, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, Jinan, China
- Center of Osteoporosis and Bone Mineral Research, Shandong University, Jinan, China
- *Correspondence: Minqi Li, ; Hongrui Liu,
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29
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The Non-Erythropoietic EPO Analogue Cibinetide Inhibits Osteoclastogenesis In Vitro and Increases Bone Mineral Density in Mice. Int J Mol Sci 2021; 23:ijms23010055. [PMID: 35008482 PMCID: PMC8744753 DOI: 10.3390/ijms23010055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/17/2021] [Accepted: 12/18/2021] [Indexed: 01/21/2023] Open
Abstract
The two erythropoietin (EPO) receptor forms mediate different cellular responses to erythropoietin. While hematopoiesis is mediated via the homodimeric EPO receptor (EPOR), tissue protection is conferred via a heteromer composed of EPOR and CD131. In the skeletal system, EPO stimulates osteoclast precursors and induces bone loss. However, the underlying molecular mechanisms are still elusive. Here, we evaluated the role of the heteromeric complex in bone metabolism in vivo and in vitro by using Cibinetide (CIB), a non-erythropoietic EPO analogue that exclusively binds the heteromeric receptor. CIB is administered either alone or in combination with EPO. One month of CIB treatment significantly increased the cortical (~5.8%) and trabecular (~5.2%) bone mineral density in C57BL/6J WT female mice. Similarly, administration of CIB for five consecutive days to female mice that concurrently received EPO on days one and four, reduced the number of osteoclast progenitors, defined by flow cytometry as Lin−CD11b−Ly6Chi CD115+, by 42.8% compared to treatment with EPO alone. In addition, CIB alone or in combination with EPO inhibited osteoclastogenesis in vitro. Our findings introduce CIB either as a stand-alone treatment, or in combination with EPO, as an appealing candidate for the treatment of the bone loss that accompanies EPO treatment.
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30
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Kim PG, Niroula A, Shkolnik V, McConkey M, Lin AE, Słabicki M, Kemp JP, Bick A, Gibson CJ, Griffin G, Sekar A, Brooks DJ, Wong WJ, Cohen DN, Uddin MM, Shin WJ, Pirruccello J, Tsai JM, Agrawal M, Kiel DP, Bouxsein ML, Richards JB, Evans DM, Wein MN, Charles JF, Jaiswal S, Natarajan P, Ebert BL. Dnmt3a-mutated clonal hematopoiesis promotes osteoporosis. J Exp Med 2021; 218:e20211872. [PMID: 34698806 PMCID: PMC8552148 DOI: 10.1084/jem.20211872] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/22/2021] [Accepted: 09/24/2021] [Indexed: 12/18/2022] Open
Abstract
Osteoporosis is caused by an imbalance of osteoclasts and osteoblasts, occurring in close proximity to hematopoietic cells in the bone marrow. Recurrent somatic mutations that lead to an expanded population of mutant blood cells is termed clonal hematopoiesis of indeterminate potential (CHIP). Analyzing exome sequencing data from the UK Biobank, we found CHIP to be associated with increased incident osteoporosis diagnoses and decreased bone mineral density. In murine models, hematopoietic-specific mutations in Dnmt3a, the most commonly mutated gene in CHIP, decreased bone mass via increased osteoclastogenesis. Dnmt3a-/- demethylation opened chromatin and altered activity of inflammatory transcription factors. Bone loss was driven by proinflammatory cytokines, including Irf3-NF-κB-mediated IL-20 expression from Dnmt3a mutant macrophages. Increased osteoclastogenesis due to the Dnmt3a mutations was ameliorated by alendronate or IL-20 neutralization. These results demonstrate a novel source of osteoporosis-inducing inflammation.
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Affiliation(s)
- Peter Geon Kim
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
| | - Abhishek Niroula
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
- Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Veronica Shkolnik
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - Marie McConkey
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - Amy E. Lin
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - Mikołaj Słabicki
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
| | - John P. Kemp
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
- MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK
| | - Alexander Bick
- Division of Genetic Medicine, Vanderbilt University, Nashville, TN
| | | | - Gabriel Griffin
- Broad Institute of Harvard and MIT, Cambridge, MA
- Department of Pathology, Brigham and Women’s Hospital, Boston, MA
| | - Aswin Sekar
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
| | - Daniel J. Brooks
- Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Boston, MA
| | - Waihay J. Wong
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
| | - Drew N. Cohen
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - Md Mesbah Uddin
- Broad Institute of Harvard and MIT, Cambridge, MA
- Center for Genomic Medicine, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - Wesley J. Shin
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - James Pirruccello
- Center for Genomic Medicine, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - Jonathan M. Tsai
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
| | - Mridul Agrawal
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
| | - Douglas P. Kiel
- Broad Institute of Harvard and MIT, Cambridge, MA
- Hinda and Arthur Marcus Institute for Aging Research, Hebrew SeniorLife, Boston, MA
| | - Mary L. Bouxsein
- Center for Advanced Orthopedic Studies, Beth Israel Deaconess Medical Center, Boston, MA
| | - J. Brent Richards
- Centre for Clinical Epidemiology, Lady Davis Institute, Jewish General Hospital, and Department of Human Genetics, McGill University, Montréal, Québec, Canada
- Department of Twin Research and Genetic Epidemiology, King's College London, London, UK
| | - David M. Evans
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
- MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK
| | - Marc N. Wein
- Broad Institute of Harvard and MIT, Cambridge, MA
- Endocrine Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - Julia F. Charles
- Department of Orthopaedic Surgery, Brigham and Women’s Hospital, Boston, MA
| | - Siddhartha Jaiswal
- Department of Pathology, Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA
| | - Pradeep Natarajan
- Broad Institute of Harvard and MIT, Cambridge, MA
- Center for Genomic Medicine, Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - Benjamin L. Ebert
- Department of Medical Oncology, Dana Farber Cancer Institute, Boston, MA
- Broad Institute of Harvard and MIT, Cambridge, MA
- Howard Hughes Medical Institute, Boston, MA
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31
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Agemura T, Hasegawa T, Yari S, Kikuta J, Ishii M. Arthritis-associated osteoclastogenic macrophages (AtoMs) participate in pathological bone erosion in rheumatoid arthritis. Immunol Med 2021; 45:22-26. [PMID: 34187325 DOI: 10.1080/25785826.2021.1944547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Rheumatoid arthritis is a chronic form of arthritis that causes bone destruction in joints such as the knees and fingers. Over the past two decades, the clinical outcomes of rheumatoid arthritis have improved substantially with the development of biological agents and Janus kinase inhibitors. Osteoclasts are myeloid lineage cells with a unique bone-destroying ability that can lead to joint destruction. On the other hand, osteoclasts play an important role in skeletal homeostasis by supporting bone remodeling together with osteoblasts in the bone marrow under steady-state conditions. However, the same osteoclasts are considered to participate in physiological bone remodeling and joint destruction. We found that pathological osteoclasts have different differentiation pathways and regulatory transcription factors compared to physiological osteoclasts. We also identified arthritis-associated osteoclastogenic macrophages (AtoMs), which are common progenitors of pathological osteoclasts in mice and humans that develop specifically in inflamed synovial tissue. This review presents details of the newly identified AtoMs and the original intravital imaging systems that can visualize synovial tissue and pathological osteoclasts at the pannus-bone interface.
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Affiliation(s)
- Tomoya Agemura
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Suita, Japan
| | - Tetsuo Hasegawa
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Suita, Japan
| | - Shinya Yari
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Suita, Japan
| | - Junichi Kikuta
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Suita, Japan.,WPI-Immunology Frontier Research Center, Osaka University, Suita, Japan.,Laboratory of Bioimaging and Drug Discovery, National Institutes of Biomedical Innovation, Health and Nutrition, Ibaraki, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Suita, Japan.,WPI-Immunology Frontier Research Center, Osaka University, Suita, Japan.,Laboratory of Bioimaging and Drug Discovery, National Institutes of Biomedical Innovation, Health and Nutrition, Ibaraki, Japan
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32
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Realization of Osteolysis, Angiogenesis, Immunosuppression, and Drug Resistance by Extracellular Vesicles: Roles of RNAs and Proteins in Their Cargoes and of Ectonucleotidases of the Immunosuppressive Adenosinergic Noncanonical Pathway in the Bone Marrow Niche of Multiple Myeloma. Cancers (Basel) 2021; 13:cancers13122969. [PMID: 34199285 PMCID: PMC8231946 DOI: 10.3390/cancers13122969] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 05/31/2021] [Accepted: 06/10/2021] [Indexed: 12/26/2022] Open
Abstract
Simple Summary Multiple myeloma (MM) is a disease that extensively involves bone, and angiogenesis and immunosuppression are important processes in the development of MM. Proteasome inhibitors and immunomodulatory drugs remarkably improve the survival of MM patients. However, MM is still an incurable disease that rapidly becomes resistant to these drugs. There is robust evidence that extracellular vesicles (EVs) contribute to cancer metastasis. Osteoclasts, in addition to immunosuppressive cells in the bone marrow (BM), are key players in osteolysis and immunosuppression. BM stromal cells and MM cells secrete EVs through which they communicate with each other: EVs, in fact, contain proteins, small RNAs, and long non-coding RNAs that mediate this communication and contribute to angiogenesis, osteolysis, and cancer dissemination and drug resistance. Ectoenzymes are expressed in myeloma cells, osteoclasts, and stromal cells and produce immunosuppressive adenosine. Recently, an antibody targeting CD38, an ectoenzyme, has been shown to improve the survival of patients with MM. Thus, understanding the properties of EV and ectoenzymes will help elucidate key processes of MM development. Abstract Angiogenesis and immunosuppression promote multiple myeloma (MM) development, and osteolysis is a primary feature of MM. Although immunomodulatory drugs and proteasome inhibitors (PIs) markedly improve the survival of patients with MM, this disease remains incurable. In the bone marrow niche, a chain of ectoenzymes, including CD38, produce immunosuppressive adenosine, inhibiting T cell proliferation as well as immunosuppressive cells. Therefore, anti-CD38 antibodies targeting myeloma cells have the potential to restore T cell responses to myeloma cells. Meanwhile extracellular vesicles (EVs) containing microRNAs, proteins such as cytokines and chemokines, long noncoding RNAs, and PIWI-interacting RNAs have been shown to act as communication tools in myeloma cell/microenvironment interactions. Via EVs, mesenchymal stem cells allow myeloma cell dissemination and confer PI resistance, whereas myeloma cells promote angiogenesis, myeloid-derived suppressor cell proliferation, and osteoclast differentiation and inhibit osteoblast differentiation. In this review, to understand key processes of MM development involving communication between myeloma cells and other cells in the tumor microenvironment, EV cargo and the non-canonical adenosinergic pathway are introduced, and ectoenzymes and EVs are discussed as potential druggable targets for the treatment of MM patients.
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YTHDF2 mediates LPS-induced osteoclastogenesis and inflammatory response via the NF-κB and MAPK signaling pathways. Cell Signal 2021; 85:110060. [PMID: 34089814 DOI: 10.1016/j.cellsig.2021.110060] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 05/14/2021] [Accepted: 05/30/2021] [Indexed: 12/26/2022]
Abstract
Aberrant elevation of osteoclast differentiation and function is responsible for disrupting bone homeostasis in various inflammatory bone diseases. YTH domain family 2 (YTHDF2) is a well-known m6A-binding protein that plays an essential role in regulating cell differentiation and inflammatory processes by mediating mRNA degradation. However, the regulatory role of YTHDF2 in inflammatory osteoclast differentiation remains unelucidated. Here, we detected the expression of m6A-related genes and found that YTHDF2 was upregulated in RANKL-primed osteoclast precursors stimulated with lipopolysaccharide (LPS). Ythdf2 knockdown in RAW264.7 cells and primary bone marrow-derived macrophages (BMMs) enhanced osteoclast formation and bone resorption, which was assessed by TRAP staining assay and pit formation assay. Ythdf2 depletion upregulated osteoclast-related gene expression and proinflammatory cytokine secretion. In contrast, overexpression of Ythdf2 produced the reverse effect. Furthermore, Ythdf2 knockdown enhanced the phosphorylation of IKKα/β, IκBα, ERK, P38 and JNK. NF-κB and MAPK signaling pathway inhibitors effectively abrogated the enhanced expression of Nfact1, c-Fos, IL-1β and TNF-α caused by Ythdf2 knockdown. Mechanistically, the mRNA stability assay revealed that Ythdf2 depletion led to stabilization of Tnfrsf11a, Traf6, Map4k4, Map2k3, Map2k4 and Nfatc1 mRNA. In summary, our findings demonstrated that YTHDF2 has a negative regulatory role in LPS-induced osteoclast differentiation and the inflammatory response via the NF-κB and MAPK signaling pathways.
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34
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Hasegawa T. Updating the pathophysiology of arthritic bone destruction: identifying and visualizing pathological osteoclasts in pannus. Immunol Med 2021; 44:246-251. [PMID: 34010590 DOI: 10.1080/25785826.2021.1913883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Osteoclasts have a unique capacity to destroy bone, playing key roles in physiological bone remodeling and arthritic bone erosion. It is not known whether the osteoclast populations in different tissue settings arise from similar monocytoid precursors. The rapid progress in the next-generation sequencing technologies has provided many valuable insights into the field of osteoimmunology, and single-cell RNA sequencing (scRNA-Seq) can elucidate cellular heterogeneity within the synovial microenvironment. The application of scRNA-Seq to the defined osteoclast precursor (OP)-containing population enabled the identification of individual cells differentiating into mature osteoclasts in the inflamed synovium, which were distinct from conventional OPs in the bone marrow. In addition, an intravital imaging system using multi-photon microscopy has been applied to the synovial tissues of arthritic mice to observe the real-time dynamics of osteoclasts and immune cells in the pannus. These technologies have contributed to elucidate the transcriptomics and dynamics of specific cells involved in pathological osteoclastogenesis, improving our understand of the pathophysiology of inflammatory osteolytic diseases. Here, we review how novel technologies such as scRNA-Seq and intravital imaging help to better understand the pathogenesis of bone erosion and we introduce recent studies that have identified and directly visualized pathological OPs in inflamed synovium.
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Affiliation(s)
- Tetsuo Hasegawa
- Division of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan.,Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan
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35
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Biological Effects of β-Glucans on Osteoclastogenesis. Molecules 2021; 26:molecules26071982. [PMID: 33915775 PMCID: PMC8036280 DOI: 10.3390/molecules26071982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/25/2021] [Accepted: 03/30/2021] [Indexed: 12/02/2022] Open
Abstract
Although the anti-tumor and anti-infective properties of β-glucans have been well-discussed, their role in bone metabolism has not been reviewed so far. This review discusses the biological effects of β-glucans on bone metabolisms, especially on bone-resorbing osteoclasts, which are differentiated from hematopoietic precursors. Multiple immunoreceptors that can recognize β-glucans were reported to be expressed in osteoclast precursors. Coordinated co-stimulatory signals mediated by these immunoreceptors are important for the regulation of osteoclastogenesis and bone remodeling. Curdlan from the bacterium Alcaligenes faecalis negatively regulates osteoclast differentiation in vitro by affecting both the osteoclast precursors and osteoclast-supporting cells. We also showed that laminarin, lichenan, and glucan from baker’s yeast, as well as β-1,3-glucan from Euglema gracilisas, inhibit the osteoclast formation in bone marrow cells. Consistent with these findings, systemic and local administration of β-glucan derived from Aureobasidium pullulans and Saccharomyces cerevisiae suppressed bone resorption in vivo. However, zymosan derived from S. cerevisiae stimulated the bone resorption activity and is widely used to induce arthritis in animal models. Additional research concerning the relationship between the molecular structure of β-glucan and its effect on osteoclastic bone resorption will be beneficial for the development of novel treatment strategies for bone-related diseases.
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36
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Computational modeling reveals a key role for polarized myeloid cells in controlling osteoclast activity during bone injury repair. Sci Rep 2021; 11:6055. [PMID: 33723343 PMCID: PMC7961065 DOI: 10.1038/s41598-021-84888-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/11/2021] [Indexed: 01/12/2023] Open
Abstract
Bone-forming osteoblasts and -resorbing osteoclasts control bone injury repair, and myeloid-derived cells such as monocytes and macrophages are known to influence their behavior. However, precisely how these multiple cell types coordinate and regulate each other over time within the bone marrow to restore bone is difficult to dissect using biological approaches. Conversely, mathematical modeling lends itself well to this challenge. Therefore, we generated an ordinary differential equation (ODE) model powered by experimental data (osteoblast, osteoclast, bone volume, pro- and anti-inflammatory myeloid cells) obtained from intra-tibially injured mice. Initial ODE results using only osteoblast/osteoclast populations demonstrated that bone homeostasis could not be recovered after injury, but this issue was resolved upon integration of pro- and anti-inflammatory myeloid population dynamics. Surprisingly, the ODE revealed temporal disconnects between the peak of total bone mineralization/resorption, and osteoblast/osteoclast numbers. Specifically, the model indicated that osteoclast activity must vary greatly (> 17-fold) to return the bone volume to baseline after injury and suggest that osteoblast/osteoclast number alone is insufficient to predict bone the trajectory of bone repair. Importantly, the values of osteoclast activity fall within those published previously. These data underscore the value of mathematical modeling approaches to understand and reveal new insights into complex biological processes.
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37
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Ansalone C, Cole J, Chilaka S, Sunzini F, Sood S, Robertson J, Siebert S, McInnes IB, Goodyear CS. TNF is a homoeostatic regulator of distinct epigenetically primed human osteoclast precursors. Ann Rheum Dis 2021; 80:748-757. [PMID: 33692019 PMCID: PMC8142443 DOI: 10.1136/annrheumdis-2020-219262] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/31/2020] [Accepted: 01/25/2021] [Indexed: 12/21/2022]
Abstract
OBJECTIVES Circulating myeloid precursors are responsible for post-natal osteoclast (OC) differentiation and skeletal health, although the exact human precursors have not been defined. Enhanced osteoclastogenesis contributes to joint destruction in rheumatoid arthritis (RA) and tumour necrosis factor (TNF) is a well-known pro-osteoclastogenic factor. Herein, we investigated the interplay between receptor activator of nuclear factor kappa-Β ligand (RANK-L), indispensable for fusion of myeloid precursors and the normal development of OCs, and TNF in directing the differentiation of diverse pre-OC populations derived from human peripheral blood. METHODS Flow cytometric cell sorting and analysis was used to assess the potential of myeloid populations to differentiate into OCs. Transcriptomic, epigenetic analysis, receptor expression and inhibitor experiments were used to unravel RANK-L and TNF signalling hierarchy. RESULTS TNF can act as a critical homoeostatic regulator of CD14+ monocyte (MO) differentiation into OCs by inhibiting osteoclastogenesis to favour macrophage development. In contrast, a distinct previously unidentified CD14-CD16-CD11c+ myeloid pre-OC population was exempt from this negative regulation. In healthy CD14+ MOs, TNF drove epigenetic modification of the RANK promoter via a TNFR1-IKKβ-dependent pathway and halted osteoclastogenesis. In a subset of patients with RA, CD14+ MOs exhibited an altered epigenetic state that resulted in dysregulated TNF-mediated OC homoeostasis. CONCLUSIONS These findings fundamentally re-define the relationship between RANK-L and TNF. Moreover, they have identified a novel pool of human circulating non-MO OC precursors that unlike MOs are epigenetically preconditioned to ignore TNF-mediated signalling. In RA, this epigenetic preconditioning occurs in the MO compartment providing a pathological consequence of failure of this pathway.
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Affiliation(s)
- Cecilia Ansalone
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - John Cole
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Sabarinadh Chilaka
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Flavia Sunzini
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Shatakshi Sood
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Jamie Robertson
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Stefan Siebert
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Iain B McInnes
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
| | - Carl S Goodyear
- Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK
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38
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Hathaway-Schrader JD, Novince CM. Maintaining homeostatic control of periodontal bone tissue. Periodontol 2000 2021; 86:157-187. [PMID: 33690918 DOI: 10.1111/prd.12368] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alveolar bone is a unique osseous tissue due to the proximity of dental plaque biofilms. Periodontal health and homeostasis are mediated by a balanced host immune response to these polymicrobial biofilms. Dysbiotic shifts within dental plaque biofilms can drive a proinflammatory immune response state in the periodontal epithelial and gingival connective tissues, which leads to paracrine signaling to subjacent bone cells. Sustained chronic periodontal inflammation disrupts "coupled" osteoclast-osteoblast actions, which ultimately result in alveolar bone destruction. This chapter will provide an overview of alveolar bone physiology and will highlight why the oral microbiota is a critical regulator of alveolar bone remodeling. The ecology of dental plaque biofilms will be discussed in the context that periodontitis is a polymicrobial disruption of host homeostasis. The pathogenesis of periodontal bone loss will be explained from both a historical and current perspective, providing the opportunity to revisit the role of fibrosis in alveolar bone destruction. Periodontal immune cell interactions with bone cells will be reviewed based on our current understanding of osteoimmunological mechanisms influencing alveolar bone remodeling. Lastly, probiotic and prebiotic interventions in the oral microbiota will be evaluated as potential noninvasive therapies to support alveolar bone homeostasis and prevent periodontal bone loss.
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Affiliation(s)
- Jessica D Hathaway-Schrader
- Department of Oral Health Sciences, College of Dental Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Chad M Novince
- Department of Oral Health Sciences, College of Dental Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
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39
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Abstract
MicroRNAs (miRNAs) are a class of short RNA molecules that mediate the regulation of gene activity through interactions with target mRNAs and subsequent silencing of gene expression. It has become increasingly clear the miRNAs regulate many diverse aspects of bone biology, including bone formation and bone resorption processes. The role of miRNAs specifically in osteoclasts has been of recent investigation, due to clinical interest in discovering new paradigms to control excessive bone resorption, as is observed in multiple conditions including aging, estrogen deprivation, cancer metastases or glucocorticoid use. Therefore understanding the role that miRNAs play during osteoclastic differentiation is of critical importance. In this review, we highlight and discuss general aspects of miRNA function in osteoclasts, including exciting data demonstrating that miRNAs encapsulated in extracellular vesicles (EVs) either originating from osteoclasts, or signaling to osteoclast from divergent sites, have important roles in bone homeostasis.
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Affiliation(s)
- Megan M Weivoda
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
| | - Sun-Kyeong Lee
- Department of Medicine, UCONN Center on Aging, University Connecticut Health Center, Farmington, CT 06030, USA
| | - David G Monroe
- Department of Medicine, Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA; Robert and Arlene Kogod Center on Aging, Rochester, MN 55905, USA.
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40
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Fujii T, Murata K, Mun SH, Bae S, Lee YJ, Pannellini T, Kang K, Oliver D, Park-Min KH, Ivashkiv LB. MEF2C regulates osteoclastogenesis and pathologic bone resorption via c-FOS. Bone Res 2021; 9:4. [PMID: 33424022 PMCID: PMC7797478 DOI: 10.1038/s41413-020-00120-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 09/13/2020] [Accepted: 09/28/2020] [Indexed: 01/07/2023] Open
Abstract
Osteoporosis is a metabolic bone disease with dysregulated coupling between bone resorption and bone formation, which results in decreased bone mineral density. The MEF2C locus, which encodes the transcription factor MADS box transcription enhancer factor 2, polypeptide C (MEF2C), is strongly associated with adult osteoporosis and osteoporotic fractures. Although the role of MEF2C in bone and cartilage formation by osteoblasts, osteocytes, and chondrocytes has been studied, the role of MEF2C in osteoclasts, which mediate bone resorption, remains unclear. In this study, we identified MEF2C as a positive regulator of human and mouse osteoclast differentiation. While decreased MEF2C expression resulted in diminished osteoclastogenesis, ectopic expression of MEF2C enhanced osteoclast generation. Using transcriptomic and bioinformatic approaches, we found that MEF2C promotes the RANKL-mediated induction of the transcription factors c-FOS and NFATc1, which play a key role in osteoclastogenesis. Mechanistically, MEF2C binds to FOS regulatory regions to induce c-FOS expression, leading to the activation of NFATC1 and downstream osteoclastogenesis. Inducible deletion of Mef2c in mice resulted in increased bone mass under physiological conditions and protected mice from bone erosion by diminishing osteoclast formation in K/BxN serum induced arthritis, a murine model of inflammatory arthritis. Our findings reveal direct regulation of osteoclasts by MEF2C, thus adding osteoclasts as a cell type in which altered MEF2C expression or function can contribute to pathological bone remodeling.
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Affiliation(s)
- Takayuki Fujii
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Koichi Murata
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA ,grid.258799.80000 0004 0372 2033Department of Orthopaedic Surgery, Kyoto University Graduate School of Medicine, Sakyo, Kyoto, 606-8507 Japan ,grid.258799.80000 0004 0372 2033Department of Advanced Medicine for Rheumatic Diseases, Kyoto University Graduate School of Medicine, Sakyo, Kyoto, 606-8507 Japan
| | - Se-Hwan Mun
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Seyeon Bae
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Ye Ji Lee
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Tannia Pannellini
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Kyuho Kang
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA ,grid.254229.a0000 0000 9611 0917Department of Biology, Chungbuk National University, Cheongju, 28644 Republic of Korea
| | - David Oliver
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA
| | - Kyung-Hyun Park-Min
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA ,grid.5386.8000000041936877XBCMB Allied Program, Weill Cornell Graduate School of Medical Science, New York, NY 10021 USA
| | - Lionel B. Ivashkiv
- grid.239915.50000 0001 2285 8823Arthritis and Tissue Degeneration Program and David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY 10021 USA ,grid.5386.8000000041936877XImmunology and Microbial Pathogenesis Program, Weill Cornell Graduate School of Medical Science, New York, NY 10021 USA
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41
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Das A, Wang X, Kang J, Coulter A, Shetty AC, Bachu M, Brooks SR, Dell'Orso S, Foster BL, Fan X, Ozato K, Somerman MJ, Thumbigere-Math V. Monocyte Subsets With High Osteoclastogenic Potential and Their Epigenetic Regulation Orchestrated by IRF8. J Bone Miner Res 2021; 36:199-214. [PMID: 32804442 PMCID: PMC8168257 DOI: 10.1002/jbmr.4165] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/21/2020] [Accepted: 08/05/2020] [Indexed: 12/24/2022]
Abstract
Osteoclasts (OCs) are bone-resorbing cells formed by the serial fusion of monocytes. In mice and humans, three distinct subsets of monocytes exist; however, it is unclear if all of them exhibit osteoclastogenic potential. Here we show that in wild-type (WT) mice, Ly6Chi and Ly6Cint monocytes are the primary source of OC formation when compared to Ly6C- monocytes. Their osteoclastogenic potential is dictated by increased expression of signaling receptors and activation of preestablished transcripts, as well as de novo gain in enhancer activity and promoter changes. In the absence of interferon regulatory factor 8 (IRF8), a transcription factor important for myelopoiesis and osteoclastogenesis, all three monocyte subsets are programmed to display higher osteoclastogenic potential. Enhanced NFATc1 nuclear translocation and amplified transcriptomic and epigenetic changes initiated at early developmental stages direct the increased osteoclastogenesis in Irf8-deficient mice. Collectively, our study provides novel insights into the transcription factors and active cis-regulatory elements that regulate OC differentiation. © 2020 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Amitabh Das
- Division of Periodontology, University of Maryland School of Dentistry, Baltimore, MD, USA.,Laboratory of Oral and Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Xiaobei Wang
- Division of Periodontology, University of Maryland School of Dentistry, Baltimore, MD, USA.,Laboratory of Oral and Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Jessica Kang
- Division of Periodontology, University of Maryland School of Dentistry, Baltimore, MD, USA
| | - Alyssa Coulter
- Laboratory of Oral and Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Amol C Shetty
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Mahesh Bachu
- Molecular Genetics of Immunity Section, Division of Developmental Biology, National Institute of Child Health and Human Development (NICHD), Bethesda, MD, USA.,Arthritis and Tissue Degeneration Program and the David Z. Rosensweig Genomics Research Center, Hospital for Special Surgery, New York, NY, USA
| | - Stephen R Brooks
- Biodata Mining and Discovery Section, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Stefania Dell'Orso
- Biodata Mining and Discovery Section, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Brian L Foster
- Division of Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Xiaoxuan Fan
- Flow Cytometry Shared Service, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Keiko Ozato
- Molecular Genetics of Immunity Section, Division of Developmental Biology, National Institute of Child Health and Human Development (NICHD), Bethesda, MD, USA
| | - Martha J Somerman
- Laboratory of Oral and Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
| | - Vivek Thumbigere-Math
- Division of Periodontology, University of Maryland School of Dentistry, Baltimore, MD, USA.,Laboratory of Oral and Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), Bethesda, MD, USA
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42
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Tang RH, Yang J, Fei J. New perspectives on traumatic bone infections. Chin J Traumatol 2020; 23:314-318. [PMID: 32847694 PMCID: PMC7718542 DOI: 10.1016/j.cjtee.2020.05.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/25/2020] [Accepted: 03/02/2020] [Indexed: 02/04/2023] Open
Abstract
In this paper, we review the results of previous studies and summarize the effects of various factors on the regulation of bone metabolism in traumatic bone infections. Infection-related bone destruction incorporates pathogens and iatrogenic factors in the process of bone resorption dominated by the skeletal and immune systems. The development of bone immunology has established a bridge of communication between the skeletal system and the immune system. Exploring the effects of pathogens, skeletal systems, immune systems, and antibacterials on bone repair in infectious conditions can help improve the treatment of these diseases.
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Affiliation(s)
- Ruo-Hui Tang
- Health Team of 96824 Troops of the Chinese People's Liberation Army, Kunming, China
| | - Jing Yang
- Emergency Department, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jun Fei
- Emergency Department, Daping Hospital, Third Military Medical University, Chongqing, China,State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China,Corresponding author. Emergency Department, Daping Hospital, Third Military Medical University, Chongqing, China.
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43
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Bai J, Wang H, Chen H, Ge G, Wang M, Gao A, Tong L, Xu Y, Yang H, Pan G, Chu PK, Geng D. Biomimetic osteogenic peptide with mussel adhesion and osteoimmunomodulatory functions to ameliorate interfacial osseointegration under chronic inflammation. Biomaterials 2020; 255:120197. [DOI: 10.1016/j.biomaterials.2020.120197] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 05/05/2020] [Accepted: 06/09/2020] [Indexed: 02/07/2023]
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44
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Multitasking by the OC Lineage during Bone Infection: Bone Resorption, Immune Modulation, and Microbial Niche. Cells 2020; 9:cells9102157. [PMID: 32987689 PMCID: PMC7598711 DOI: 10.3390/cells9102157] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/22/2020] [Accepted: 09/22/2020] [Indexed: 01/18/2023] Open
Abstract
Bone infections, also known as infectious osteomyelitis, are accompanied by significant inflammation, osteolysis, and necrosis. Osteoclasts (OCs) are the bone-resorbing cells that work in concert with osteoblasts and osteocytes to properly maintain skeletal health and are well known to respond to inflammation by increasing their resorptive activity. OCs have typically been viewed merely as effectors of pathologic bone resorption, but recent evidence suggests they may play an active role in the progression of infections through direct effects on pathogens and via the immune system. This review discusses the host- and pathogen-derived factors involved in the in generation of OCs during infection, the crosstalk between OCs and immune cells, and the role of OC lineage cells in the growth and survival of pathogens, and highlights unanswered questions in the field.
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45
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Zhao Y, Li Z, Su L, Ballesteros-Tato A, Katz J, Michalek SM, Feng X, Zhang P. Frontline Science: Characterization and regulation of osteoclast precursors following chronic Porphyromonas gingivalis infection. J Leukoc Biol 2020; 108:1037-1050. [PMID: 33463750 DOI: 10.1002/jlb.1hi0620-230r] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 06/30/2020] [Accepted: 07/07/2020] [Indexed: 12/14/2022] Open
Abstract
Bone destruction in inflammatory osteolytic diseases including periodontitis is related to excessive activity of osteoclasts (OC), which originate from precursor cells of the myeloid lineage, termed osteoclast precursors (OCP). In contrast to ample knowledge that we currently have on mature OC, little is known about OCP and their regulation during bacterial infection. Therefore, this study aimed to identify and characterize OCP following chronic infection with a periodontal bacteria Porphyromonas gingivalis (Pg). We used a microosmotic pump to continually release Pg subcutaneously in a murine model. Two weeks after Pg infection, the frequency of CD11b+c-fms+Ly6Chi population is significantly elevated within the bone marrow, spleen, and peripheral blood. In vitro and in vivo studies identified these cells as the OCP-containing population and Pg infection significantly enhanced the osteoclastogenic activity of these cells. Furthermore, mRNA sequencing analysis indicated a unique gene and pathway profile in CD11b+c-fms+Ly6Chi population following Pg infection, with changes in genes and pathways related to OC differentiation, cell proliferation and apoptosis, inflammatory response, phagocytosis, and immunity, as well as antigen processing and presentation. Moreover, using IL-6 knockout mice, we found that IL-6 is important for Pg-induced accumulation of CD11b+c-fms+Ly6Chi population from the bone marrow and periphery. Our results provide new insight into the characterization and regulation of OCP following a chronic bacterial infection. This knowledge is relevant to the understanding of the pathogenesis of bacteria-induced bone loss, and to the identification of potential therapeutic targets of bone loss diseases.
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Affiliation(s)
- Yanfang Zhao
- Department of Pediatric Dentistry, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Zhaofei Li
- Department of Pediatric Dentistry, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Lingkai Su
- Department of Pediatric Dentistry, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | | | - Jannet Katz
- Department of Pediatric Dentistry, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Suzanne M Michalek
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Xu Feng
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Ping Zhang
- Department of Pediatric Dentistry, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, USA
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46
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Madel MB, Ibáñez L, Ciucci T, Halper J, Rouleau M, Boutin A, Hue C, Duroux-Richard I, Apparailly F, Garchon HJ, Wakkach A, Blin-Wakkach C. Dissecting the phenotypic and functional heterogeneity of mouse inflammatory osteoclasts by the expression of Cx3cr1. eLife 2020; 9:54493. [PMID: 32400390 PMCID: PMC7220377 DOI: 10.7554/elife.54493] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 04/26/2020] [Indexed: 12/19/2022] Open
Abstract
Bone destruction relies on interactions between bone and immune cells. Bone-resorbing osteoclasts (OCLs) were recently identified as innate immune cells activating T cells toward tolerance or inflammation. Thus, pathological bone destruction not only relies on increased osteoclast differentiation, but also on the presence of inflammatory OCLs (i-OCLs), part of which express Cx3cr1. Here, we investigated the contribution of mouse Cx3cr1+ and Cx3cr1neg i-OCLs to bone loss. We showed that Cx3cr1+ and Cx3cr1neg i-OCLs differ considerably in transcriptional and functional aspects. Cx3cr1neg i-OCLs have a high ability to resorb bone and activate inflammatory CD4+ T cells. Although Cx3cr1+ i-OCLs are associated with inflammation, they resorb less and have in vitro an immune-suppressive effect on Cx3cr1neg i-OCLs, mediated by PD-L1. Our results provide new insights into i-OCL heterogeneity. They also reveal that different i-OCL subsets may interact to regulate inflammation. This contributes to a better understanding and prevention of inflammatory bone destruction.
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Affiliation(s)
- Maria-Bernadette Madel
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
| | - Lidia Ibáñez
- Department of Pharmacy, Cardenal Herrera-CEU University, Valencia, Spain
| | - Thomas Ciucci
- Laboratory of Immune Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, United States
| | - Julia Halper
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
| | - Matthieu Rouleau
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
| | - Antoine Boutin
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
| | - Christophe Hue
- Université Paris-Saclay, UVSQ, INSERM, Infection et inflammation, Montigny-Le-Bretonneux, France
| | | | | | - Henri-Jean Garchon
- Université Paris-Saclay, UVSQ, INSERM, Infection et inflammation, Montigny-Le-Bretonneux, France.,Genetics division, Ambroise Paré Hospital, AP-HP, Boulogne-Billancourt, France
| | - Abdelilah Wakkach
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
| | - Claudine Blin-Wakkach
- Laboratoire de PhysioMédecine Moléculaire, CNRS, Nice, France.,Université Côte d'Azur, Nice, France
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47
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Hile G, Kahlenberg JM, Gudjonsson JE. Recent genetic advances in innate immunity of psoriatic arthritis. Clin Immunol 2020; 214:108405. [PMID: 32247832 DOI: 10.1016/j.clim.2020.108405] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/28/2020] [Accepted: 03/28/2020] [Indexed: 12/19/2022]
Abstract
Psoriatic arthritis (PsA) is a heterogeneous disease that affects multiple organ systems including the peripheral and axial joints, entheses and nails. PsA is associated with significant comorbidities including cardiovascular, metabolic, and psychiatric diseases. The pathogenesis of PsA is complex and involves genetic, immunologic and environmental factors. Recent evidence suggests the heritability for PsA to be stronger and distinct from that of PsC. Prominent genes identified via GWAS for PsA include HLA-B/C, HLAB, IL12B, IL23R, TNP1, TRAF3IP3, and REL. We review the genetics of psoriatic arthritis and discuss the role of the innate immune system as important in the pathogenesis of PsA by focusing on key signaling pathways and cellular makeup. Understanding the candidate genes identified in PsA highlights pathways of critical importance to the pathogenesis of psoriatic disease including the key role of the innate immune response, mediated through IL-23/IL-17 axis, RANK and NFκB signaling pathways.
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Affiliation(s)
- Grace Hile
- Department of Dermatology, University of Michigan, Ann Arbor 48109, MI, USA.
| | - J Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Johann E Gudjonsson
- Department of Dermatology, University of Michigan, Ann Arbor 48109, MI, USA.
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48
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Hathaway-Schrader JD, Poulides NA, Carson MD, Kirkpatrick JE, Warner AJ, Swanson BA, Taylor EV, Chew ME, Reddy SV, Liu B, Westwater C, Novince CM. Specific Commensal Bacterium Critically Regulates Gut Microbiota Osteoimmunomodulatory Actions During Normal Postpubertal Skeletal Growth and Maturation. JBMR Plus 2020; 4:e10338. [PMID: 32161843 PMCID: PMC7059828 DOI: 10.1002/jbm4.10338] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 01/06/2020] [Accepted: 01/07/2020] [Indexed: 12/19/2022] Open
Abstract
The commensal gut microbiota critically regulates immunomodulatory processes that influence normal skeletal growth and maturation. However, the influence of specific microbes on commensal gut microbiota osteoimmunoregulatory actions is unknown. We have shown previously that the commensal gut microbiota enhances TH17/IL17A immune response effects in marrow and liver that have procatabolic/antianabolic actions in the skeleton. Segmented filamentous bacteria (SFB), a specific commensal gut bacterium within phylum Firmicutes, potently induces TH17/IL17A‐mediated immunity. The study purpose was to delineate the influence of SFB on commensal gut microbiota immunomodulatory actions regulating normal postpubertal skeletal development. Two murine models were utilized: SFB‐monoassociated mice versus germ‐free (GF) mice and specific‐pathogen‐free (SPF) mice +/− SFB. SFB colonization was validated by 16S rDNA analysis, and SFB‐induced TH17/IL17A immunity was confirmed by upregulation of Il17a in ileum and IL17A in serum. SFB‐colonized mice had an osteopenic trabecular bone phenotype, which was attributed to SFB actions suppressing osteoblastogenesis and enhancing osteoclastogenesis. Intriguingly, SFB‐colonized mice had increased expression of proinflammatory chemokines and acute‐phase reactants in the liver. Lipocalin‐2 (LCN2), an acute‐phase reactant and antimicrobial peptide, was substantially elevated in the liver and serum of SFB‐colonized mice, which supports the notion that SFB regulation of commensal gut microbiota osteoimmunomodulatory actions are mediated in part through a gut–liver–bone axis. Proinflammatory TH17 and TH1 cells were increased in liver‐draining lymph nodes of SFB‐colonized mice, which further substantiates that SFB osteoimmune‐response effects may be mediated through the liver. SFB‐induction of Il17a in the gut and Lcn2 in the liver resulted in increased circulating levels of IL17A and LCN2. Recognizing that IL17A and LCN2 support osteoclastogenesis/suppress osteoblastogenesis, SFB actions impairing postpubertal skeletal development appear to be mediated through immunomodulatory effects in both the gut and liver. This research reveals that specific microbes critically impact commensal gut microbiota immunomodulatory actions regulating normal postpubertal skeletal growth and maturation. © 2020 The Authors. JBMR Plus published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Jessica D Hathaway-Schrader
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Nicole A Poulides
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Matthew D Carson
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Joy E Kirkpatrick
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Drug Discovery & Biomedical Sciences College of Pharmacy, Medical University of South Carolina Charleston SC USA
| | - Amy J Warner
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Brooks A Swanson
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Eliza V Taylor
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA
| | - Michael E Chew
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA
| | - Sakamuri V Reddy
- Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Bei Liu
- Department of Microbiology and Immunology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Caroline Westwater
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Microbiology and Immunology College of Medicine, Medical University of South Carolina Charleston SC USA
| | - Chad M Novince
- Department of Oral Health Sciences College of Dental Medicine, Medical University of South Carolina Charleston SC USA.,Department of Pediatrics-Division of Endocrinology College of Medicine, Medical University of South Carolina Charleston SC USA
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49
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Novak S, Roeder E, Kalinowski J, Jastrzebski S, Aguila HL, Lee SK, Kalajzic I, Lorenzo JA. Osteoclasts Derive Predominantly from Bone Marrow-Resident CX 3CR1 + Precursor Cells in Homeostasis, whereas Circulating CX 3CR1 + Cells Contribute to Osteoclast Development during Fracture Repair. THE JOURNAL OF IMMUNOLOGY 2020; 204:868-878. [PMID: 31915261 DOI: 10.4049/jimmunol.1900665] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 12/12/2019] [Indexed: 01/10/2023]
Abstract
Osteoclasts (OC) originate from either bone marrow (BM)-resident or circulating myeloid OC progenitors (OCP) expressing the receptor CX3CR1. Multiple lines of evidence argue that OCP in homeostasis and inflammation differ. We investigated the relative contributions of BM-resident and circulating OCP to osteoclastogenesis during homeostasis and fracture repair. Using CX3CR1-EGFP/TRAP tdTomato mice, we found CX3CR1 expression in mononuclear cells, but not in multinucleated TRAP+ OC. However, CX3CR1-expressing cells generated TRAP+ OC on bone within 5 d in CX3CR1CreERT2/Ai14 tdTomato reporter mice. To define the role that circulating cells play in osteoclastogenesis during homeostasis, we parabiosed TRAP tdTomato mice (CD45.2) on a C57BL/6 background with wild-type (WT) mice (CD45.1). Flow cytometry (CD45.1/45.2) demonstrated abundant blood cell mixing between parabionts after 2 wk. At 4 wk, there were numerous tdTomato+ OC in the femurs of TRAP tdTomato mice but almost none in WT mice. Similarly, cultured BM stimulated to form OC demonstrated multiple fluorescent OC in cell cultures from TRAP tdTomato mice, but not from WT mice. Finally, flow cytometry confirmed low-level engraftment of BM cells between parabionts but significant engraftment in the spleens. In contrast, during fracture repair, we found that circulating CX3CR1+ cells migrated to bone, lost expression of CX3CR1, and became OC. These data demonstrate that OCP, but not mature OC, express CX3CR1 during both homeostasis and fracture repair. We conclude that, in homeostasis mature OC derive predominantly from BM-resident OCP, whereas during fracture repair, circulating CX3CR1+ cells can become OC.
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Affiliation(s)
- Sanja Novak
- Department of Reconstructive Sciences, UConn Health, Farmington, CT 06030
| | - Emilie Roeder
- Department of Reconstructive Sciences, UConn Health, Farmington, CT 06030
| | | | | | - Hector L Aguila
- Department of Immunology, UConn Health, Farmington, CT 06030
| | - Sun-Kyeong Lee
- University of Connecticut Center on Aging, UConn Health, Farmington, CT 06030; and
| | - Ivo Kalajzic
- Department of Reconstructive Sciences, UConn Health, Farmington, CT 06030
| | - Joseph A Lorenzo
- Department of Medicine, UConn Health, Farmington, CT 06030; .,Department of Orthopaedic Surgery, UConn Health, Farmington, CT 06030
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50
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Ascone G, Di Ceglie I, Walgreen B, Sloetjes AW, Lindhout E, Bot I, van de Loo FAJ, Koenders MI, van der Kraan PM, Blom AB, van den Bosch MHJ, van Lent PLEM. High LDL levels lessen bone destruction during antigen-induced arthritis by inhibiting osteoclast formation and function. Bone 2020; 130:115140. [PMID: 31712132 DOI: 10.1016/j.bone.2019.115140] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 09/27/2019] [Accepted: 11/04/2019] [Indexed: 01/05/2023]
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disease, characterized by severe joint inflammation and bone destruction as the result of increased numbers and activity of osteoclasts. RA is often associated with metabolic syndrome, whereby elevated levels of LDL are oxidized into oxLDL, which might affect osteoclastogenesis. In this study, we induced antigen-induced arthritis (AIA) in Apoe-/- mice, which spontaneously develop high LDL levels, to investigate the effects of high LDL/oxLDL levels on osteoclast differentiation and bone destruction. Whereas basal levels of bone resorption were comparable between naive WT and Apoe-/- mice, induction of AIA resulted in a significant reduction of bone destruction in Apoe-/- mice as compared to WT controls. In line with that, the TRAP+ area on the cortical bone was significantly decreased. The absence of Apoe did affect neither the numbers of CD11b+Ly6Chigh and CD11b-/Ly6Chigh osteoclast precursors (OCPs) in the BM of naïve mice nor their in vitro osteoclastogenic potential as indicated by comparable mRNA expression of osteoclast markers. Addition of oxLDL, but not LDL, to pre-osteoclasts from day 3 and mature osteoclasts from day 6 of osteoclastogenesis strongly reduced the number of TRAP+ osteoclasts and their resorptive capacity. This coincided with a decreased expression of various osteoclast markers. Interestingly, oxLDL significantly lowered the expression of osteoclast-associated receptor (Oscar) and the DNAX adaptor protein-12 encoding gene Tyrobp, which regulate the immunoreceptor tyrosine-based activation motif (ITAM) co-stimulation pathway that is strongly involved in osteoclastogenesis. Collectively, our findings suggest that under inflammatory conditions in the joint, high LDL levels lessen bone destruction during AIA, probably by formation of oxLDL that inhibits osteoclast formation and activity through modulation of the ITAM-signaling.
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Affiliation(s)
- G Ascone
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - I Di Ceglie
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - B Walgreen
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - A W Sloetjes
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - E Lindhout
- Future Diagnostics Solutions (FDx), Wijchen, the Netherlands.
| | - I Bot
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research (LACDR), Leiden, the Netherlands.
| | - F A J van de Loo
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - M I Koenders
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - P M van der Kraan
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - A B Blom
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - M H J van den Bosch
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
| | - P L E M van Lent
- Department of Experimental Rheumatology, Radboud University Medical Center, Radboud Institute of Molecular Life Sciences (RIMLS), Nijmegen, the Netherlands.
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