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Xu X, Li Y, Shi L, He K, Sun Y, Ding Y, Meng B, Zhang J, Xiang L, Dong J, Liu M, Zhang J, Xiang L, Xiang G. Myeloid-derived growth factor (MYDGF) protects bone mass through inhibiting osteoclastogenesis and promoting osteoblast differentiation. EMBO Rep 2022; 23:e53509. [PMID: 35068044 PMCID: PMC8892248 DOI: 10.15252/embr.202153509] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 12/15/2021] [Accepted: 12/21/2021] [Indexed: 12/13/2022] Open
Abstract
Whether bone marrow regulates bone metabolism through endocrine and paracrine mechanism remains largely unknown. Here, we found that (i) myeloid cell-specific myeloid-derived growth factor (MYDGF) deficiency decreased bone mass and bone strength in young and aged mice; (ii) myeloid cell-specific MYDGF restoration prevented decreases in bone mass and bone strength in MYDGF knockout mice; moreover, myeloid cell-derived MYDGF improved the progress of bone defects healing, prevented ovariectomy (OVX)-induced bone loss and age-related osteoporosis; (iii) MYDGF inhibited osteoclastogenesis and promoted osteoblast differentiation in vivo and in vitro; and (iv) PKCβ-NF-κB and MAPK1/3-STAT3 pathways were involved in the regulation of MYDGF on bone metabolism. Thus, we concluded that myeloid cell-derived MYDGF is a positive regulator of bone homeostasis by inhibiting bone resorption and promoting bone formation. MYDGF may become a potential novel therapeutic drug for osteoporosis, and bone marrow may become a potential therapeutic target for bone metabolic disorders.
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Affiliation(s)
- Xiaoli Xu
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Yixiang Li
- Department of Hematology and Medical OncologySchool of MedicineEmory UniversityAtlantaGAUSA
| | - Lingfeng Shi
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Kaiyue He
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Ying Sun
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina
| | - Yan Ding
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Biying Meng
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Jiajia Zhang
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina
| | - Lin Xiang
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina
| | - Jing Dong
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina
| | - Min Liu
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina
| | - Junxia Zhang
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
| | - Lingwei Xiang
- Centers for Surgery and Public HealthBrigham and Women's HospitalBostonMAUSA
| | - Guangda Xiang
- Department of EndocrinologyGeneral Hospital of Central Theater CommandWuhanChina,The First School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
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52
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Khosla S, Farr JN, Monroe DG. Cellular senescence and the skeleton: pathophysiology and therapeutic implications. J Clin Invest 2022; 132:154888. [PMID: 35104801 PMCID: PMC8803328 DOI: 10.1172/jci154888] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Cellular senescence is a fundamental aging mechanism that is currently the focus of considerable interest as a pathway that could be targeted to ameliorate aging across multiple tissues, including the skeleton. There is now substantial evidence that senescent cells accumulate in the bone microenvironment with aging and that targeting these cells prevents age-related bone loss, at least in mice. Cellular senescence also plays important roles in mediating the skeletal fragility associated with diabetes mellitus, radiation, and chemotherapy. As such, there are ongoing efforts to develop "senolytic" drugs that kill senescent cells by targeting key survival mechanisms in these cells without affecting normal cells. Because senescent cells accumulate across tissues with aging, senolytics offer the attractive possibility of treating multiple age-related comorbidities simultaneously.
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53
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Gado M, Baschant U, Hofbauer LC, Henneicke H. Bad to the Bone: The Effects of Therapeutic Glucocorticoids on Osteoblasts and Osteocytes. Front Endocrinol (Lausanne) 2022; 13:835720. [PMID: 35432217 PMCID: PMC9008133 DOI: 10.3389/fendo.2022.835720] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 02/10/2022] [Indexed: 02/06/2023] Open
Abstract
Despite the continued development of specialized immunosuppressive therapies in the form of monoclonal antibodies, glucocorticoids remain a mainstay in the treatment of rheumatological and auto-inflammatory disorders. Therapeutic glucocorticoids are unmatched in the breadth of their immunosuppressive properties and deliver their anti-inflammatory effects at unparalleled speed. However, long-term exposure to therapeutic doses of glucocorticoids decreases bone mass and increases the risk of fractures - particularly in the spine - thus limiting their clinical use. Due to the abundant expression of glucocorticoid receptors across all skeletal cell populations and their respective progenitors, therapeutic glucocorticoids affect skeletal quality through a plethora of cellular targets and molecular mechanisms. However, recent evidence from rodent studies, supported by clinical data, highlights the considerable role of cells of the osteoblast lineage in the pathogenesis of glucocorticoid-induced osteoporosis: it is now appreciated that cells of the osteoblast lineage are key targets of therapeutic glucocorticoids and have an outsized role in mediating their undesirable skeletal effects. As part of this article, we review the molecular mechanisms underpinning the detrimental effects of supraphysiological levels of glucocorticoids on cells of the osteoblast lineage including osteocytes and highlight the clinical implications of recent discoveries in the field.
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Affiliation(s)
- Manuel Gado
- Center for Regenerative Therapies TU Dresden, Technische Universität Dresden, Dresden, Germany
| | - Ulrike Baschant
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Center for Healthy Aging, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Lorenz C. Hofbauer
- Center for Regenerative Therapies TU Dresden, Technische Universität Dresden, Dresden, Germany
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Center for Healthy Aging, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Holger Henneicke
- Center for Regenerative Therapies TU Dresden, Technische Universität Dresden, Dresden, Germany
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- Center for Healthy Aging, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- *Correspondence: Holger Henneicke,
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54
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Schilling K, Zhai Y, Zhou Z, Zhou B, Brown E, Zhang X. High-resolution imaging of the osteogenic and angiogenic interface at the site of murine cranial bone defect repair via multiphoton microscopy. eLife 2022; 11:83146. [PMID: 36326085 PMCID: PMC9678361 DOI: 10.7554/elife.83146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/31/2022] [Indexed: 11/05/2022] Open
Abstract
The spatiotemporal blood vessel formation and specification at the osteogenic and angiogenic interface of murine cranial bone defect repair were examined utilizing a high-resolution multiphoton-based imaging platform in conjunction with advanced optical techniques that allow interrogation of the oxygen microenvironment and cellular energy metabolism in living animals. Our study demonstrates the dynamic changes of vessel types, that is, arterial, venous, and capillary vessel networks at the superior and dura periosteum of cranial bone defect, suggesting a differential coupling of the vessel type with osteoblast expansion and bone tissue deposition/remodeling during repair. Employing transgenic reporter mouse models that label distinct types of vessels at the site of repair, we further show that oxygen distributions in capillary vessels at the healing site are heterogeneous as well as time- and location-dependent. The endothelial cells coupling to osteoblasts prefer glycolysis and are less sensitive to microenvironmental oxygen changes than osteoblasts. In comparison, osteoblasts utilize relatively more OxPhos and potentially consume more oxygen at the site of repair. Taken together, our study highlights the dynamics and functional significance of blood vessel types at the site of defect repair, opening up opportunities for further delineating the oxygen and metabolic microenvironment at the interface of bone tissue regeneration.
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Affiliation(s)
- Kevin Schilling
- Center for Musculoskeletal Research, University of Rochester, School of Medicine and DentistryRochesterUnited States,Department of Biomedical Engineering, University of RochesterRochesterUnited States
| | - Yuankn Zhai
- Center for Musculoskeletal Research, University of Rochester, School of Medicine and DentistryRochesterUnited States
| | - Zhuang Zhou
- Center for Musculoskeletal Research, University of Rochester, School of Medicine and DentistryRochesterUnited States
| | - Bin Zhou
- Shanghai Institutes for Biological SciencesShanghaiChina
| | - Edward Brown
- Department of Biomedical Engineering, University of RochesterRochesterUnited States
| | - Xinping Zhang
- Center for Musculoskeletal Research, University of Rochester, School of Medicine and DentistryRochesterUnited States
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55
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Zhang W, Wang Y. Evaluation of Glucocorticoid Therapy in Asthma Children with Small Airway Obstruction Based on CT Features of Deep Learning. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2021; 2021:7936548. [PMID: 34970330 PMCID: PMC8714381 DOI: 10.1155/2021/7936548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/31/2021] [Accepted: 11/06/2021] [Indexed: 11/17/2022]
Abstract
This study was aimed at exploring the treatment of asthma children with small airway obstruction in CT imaging features of deep learning and glucocorticoid. A total of 145 patients meeting the requirements in hospital were included in this study, and they were randomly assigned to receive aerosolized glucocorticoid (n = 45), aerosolized glucocorticoid combined with bronchodilator (n = 50), or oral steroids (n = 50) for 4 weeks after discharge. The lung function and fractional exhaled nitric oxide (FENO) indexes of the three groups were measured, respectively, and then the effective rates were compared to evaluate the clinical efficacy of glucocorticoids with different administration methods and combined medications in the short-term maintenance treatment after acute exacerbation of asthma. Deep learning algorithm was used for CT image segmentation. The CT image is sent to the workbench for processing on the workbench, and then the convolution operation is performed on each input pixel point during the image processing. After 4 weeks of maintenance treatment, FEF50 %, FEF75 %, and MMEF75/25 increased significantly, and FENO decreased significantly (P < 0.01). The improvement results of FEF50 %, FEF75 %, MMEF75/25, and FENO after maintenance treatment were as follows: the oral hormone group was the most effective, followed by the combined atomization inhalation group, and the hormone atomization inhalation group was the least effective. The differences among them were statistically significant (P < 0.05). The accuracy of artificial intelligence segmentation algorithm was 81%. All the hormones were more effective than local medication in the treatment of small airway function and airway inflammation. In the treatment of aerosol inhalation, the hormone combined with bronchiectasis drug was the most effective in improving small airway obstruction and reducing airway inflammation compared with single drug inhalation. Deep learning CT images are simple, noninvasive, and intuitively observe lung changes in asthma with small airway functional obstruction. Asthma with small airway functional obstruction has high clinical diagnosis and evaluation value.
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Affiliation(s)
- Wei Zhang
- Department of Children Respiratory, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430070 Hubei, China
| | - Yang Wang
- Department of Children Gastroenterology, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430070 Hubei, China
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56
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Malaise O, Paulissen G, Deroyer C, Ciregia F, Poulet C, Neuville S, Plener Z, Daniel C, Gillet P, Lechanteur C, Brondello JM, de Seny D, Malaise M. Influence of Glucocorticoids on Cellular Senescence Hallmarks in Osteoarthritic Fibroblast-like Synoviocytes. J Clin Med 2021; 10:jcm10225331. [PMID: 34830613 PMCID: PMC8617749 DOI: 10.3390/jcm10225331] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/25/2021] [Accepted: 11/13/2021] [Indexed: 12/31/2022] Open
Abstract
Osteoarthritis (OA) is recognized as being a cellular senescence-linked disease. Intra-articular injections of glucocorticoids (GC) are frequently used in knee OA to treat synovial effusion but face controversies about toxicity. We investigated the influence of GC on cellular senescence hallmarks and senescence induction in fibroblast-like synoviocytes (FLS) from OA patients and mesenchymal stem cells (MSC). Methods: Cellular senescence was assessed via the proliferation rate, β-galactosidase staining, DNA damage and CKI expression (p21, p16INK4A). Experimental senescence was induced by irradiation. Results: The GC prednisolone did not induce an apparent senescence phenotype in FLS, with even higher proliferation, no accumulation of β-galactosidase-positive cells nor DNA damage and reduction in p21mRNA, only showing the enhancement of p16INK4A. Prednisolone did not modify experimental senescence induction in FLS, with no modulation of any senescence parameters. Moreover, prednisolone did not induce a senescence phenotype in MSC: despite high β-galactosidase-positive cells, no reduction in proliferation, no DNA damage and no CKI enhancement was observed. Conclusions: We provide reassuring in vitro data about the use of GC regarding cellular senescence involvement in OA: the GC prednisolone did not induce a senescent phenotype in OA FLS (the proliferation ratio was even higher) and in MSC and did not worsen cellular senescence establishment.
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Affiliation(s)
- Olivier Malaise
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
- Correspondence: ; Tel.: +32-4-366-7863
| | - Geneviève Paulissen
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Céline Deroyer
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Federica Ciregia
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Christophe Poulet
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Sophie Neuville
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Zelda Plener
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Christophe Daniel
- Orthopedic Surgery Department, CHU de Liège, 4000 Liège, Belgium; (C.D.); (P.G.)
| | - Philippe Gillet
- Orthopedic Surgery Department, CHU de Liège, 4000 Liège, Belgium; (C.D.); (P.G.)
| | - Chantal Lechanteur
- Laboratory of Cell and Gene Therapy, Department of Hematology, CHU de Liège, 4000 Liège, Belgium;
| | - Jean-Marc Brondello
- Institute for Regenerative Medicine and Biotherapy, Univ Montpellier, INSERM UMR1183, 34298 Montpellier, France;
| | - Dominique de Seny
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
| | - Michel Malaise
- Laboratory of Rheumatology, GIGA Research, CHU de Liège, University of Liège, 4000 Liège, Belgium; (G.P.); (C.D.); (F.C.); (C.P.); (S.N.); (Z.P.); (D.d.S.); (M.M.)
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Santhanam L, Liu G, Jandu S, Su W, Wodu BP, Savage W, Poe A, Liu X, Alexander LM, Cao X, Wan M. Skeleton-secreted PDGF-BB mediates arterial stiffening. J Clin Invest 2021; 131:e147116. [PMID: 34437300 PMCID: PMC8516464 DOI: 10.1172/jci147116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 08/24/2021] [Indexed: 11/17/2022] Open
Abstract
Evidence links osteoporosis and cardiovascular disease but the cellular and molecular mechanisms are unclear. Here we identify skeleton-secreted platelet-derived growth factor-BB (PDGF-BB) as a key mediator of arterial stiffening in response to aging and metabolic stress. Aged mice and those fed high-fat diet (HFD), relative to young mice and those fed normal chow food diet, respectively, had higher serum PDGF-BB and developed bone loss and arterial stiffening. Bone/bone marrow preosteoclasts in aged mice and HFD mice secrete an excessive amount of PDGF-BB, contributing to the elevated PDGF-BB in blood circulation. Conditioned medium prepared from preosteoclasts stimulated proliferation and migration of the vascular smooth muscle cells. Conditional transgenic mice, in which PDGF-BB is overexpressed in preosteoclasts, had 3-fold higher serum PDGF-BB concentration and developed simultaneous bone loss and arterial stiffening spontaneously at a young age. Conversely, in conditional knockout mice, in which PDGF-BB is deleted selectively in preosteoclasts, HFD did not affect serum PDGF-BB concentration; as a result, HFD-induced bone loss and arterial stiffening were attenuated. These studies confirm that preosteoclasts are a main source of excessive PDGF-BB in blood circulation during aging and metabolic stress and establish the role of skeleton-derived PDGF-BB as an important mediator of vascular stiffening.
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Affiliation(s)
- Lakshmi Santhanam
- Department of Anesthesiology and Critical Care Medicine and
- Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Guanqiao Liu
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Sandeep Jandu
- Department of Anesthesiology and Critical Care Medicine and
| | - Weiping Su
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Orthopaedic Surgery, The Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Bulouere P. Wodu
- Department of Biotechnology, The Johns Hopkins University, Baltimore, Maryland, USA
| | - William Savage
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, The Johns Hopkins University, Baltimore, Maryland, USA
| | - Alan Poe
- Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Xiaonan Liu
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Lacy M. Alexander
- Department of Kinesiology, Penn State University, University Park, Pennsylvania, USA
| | - Xu Cao
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Mei Wan
- Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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58
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Senescent immune cells release grancalcin to promote skeletal aging. Cell Metab 2021; 33:1957-1973.e6. [PMID: 34614408 DOI: 10.1016/j.cmet.2021.08.009] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 07/06/2021] [Accepted: 08/14/2021] [Indexed: 01/18/2023]
Abstract
Skeletal aging is characterized by low bone turnover and marrow fat accumulation. However, the underlying mechanism for this imbalance is unclear. Here, we show that during aging in rats and mice proinflammatory and senescent subtypes of immune cells, including macrophages and neutrophils, accumulate in the bone marrow and secrete abundant grancalcin. The injection of recombinant grancalcin into young mice was sufficient to induce premature skeletal aging. In contrast, genetic deletion of Gca in neutrophils and macrophages delayed skeletal aging. Mechanistically, we found that grancalcin binds to the plexin-b2 receptor and partially inactivates its downstream signaling pathways, thus repressing osteogenesis and promoting adipogenesis of bone marrow mesenchymal stromal cells. Heterozygous genetic deletion of Plexnb2 in skeletal stem cells abrogated the improved bone phenotype of Gca-knockout mice. Finally, we developed a grancalcin-neutralizing antibody and showed that its treatment of older mice improved bone health. Together, our data suggest that grancalcin could be a potential target for the treatment of age-related osteoporosis.
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Cellular senescence in musculoskeletal homeostasis, diseases, and regeneration. Bone Res 2021; 9:41. [PMID: 34508069 PMCID: PMC8433460 DOI: 10.1038/s41413-021-00164-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 06/08/2021] [Accepted: 07/14/2021] [Indexed: 01/10/2023] Open
Abstract
Emerging insights into cellular senescence highlight the relevance of senescence in musculoskeletal disorders, which represent the leading global cause of disability. Cellular senescence was initially described by Hayflick et al. in 1961 as an irreversible nondividing state in in vitro cell culture studies. We now know that cellular senescence can occur in vivo in response to various stressors as a heterogeneous and tissue-specific cell state with a secretome phenotype acquired after the initial growth arrest. In the past two decades, compelling evidence from preclinical models and human data show an accumulation of senescent cells in many components of the musculoskeletal system. Cellular senescence is therefore a defining feature of age-related musculoskeletal disorders, and targeted elimination of these cells has emerged recently as a promising therapeutic approach to ameliorate tissue damage and promote repair and regeneration of the skeleton and skeletal muscles. In this review, we summarize evidence of the role of senescent cells in the maintenance of bone homeostasis during childhood and their contribution to the pathogenesis of chronic musculoskeletal disorders, including osteoporosis, osteoarthritis, and sarcopenia. We highlight the diversity of the senescent cells in the microenvironment of bone, joint, and skeletal muscle tissue, as well as the mechanisms by which these senescent cells are involved in musculoskeletal diseases. In addition, we discuss how identifying and targeting senescent cells might positively affect pathologic progression and musculoskeletal system regeneration.
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