1
|
Molitoris KH, Balu AR, Huang M, Baht GS. The impact of age and sex on the inflammatory response during bone fracture healing. JBMR Plus 2024; 8:ziae023. [PMID: 38560342 PMCID: PMC10978063 DOI: 10.1093/jbmrpl/ziae023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 12/29/2023] [Accepted: 02/12/2024] [Indexed: 04/04/2024] Open
Abstract
Inflammation is thought to be dysregulated with age leading to impaired bone fracture healing. However, broad analyses of inflammatory processes during homeostatic bone aging and during repair are lacking. Here, we assessed changes in inflammatory cell and cytokine profiles in circulation and in bone tissue to identify age- and sex-dependent differences during homeostasis and repair. During homeostatic aging, male mice demonstrated accumulation of CD4+ helper T cells and CD8+ cytotoxic T cells within bone while both pro-inflammatory "M1" and anti-inflammatory "M2" macrophage numbers decreased. Female mice saw no age-associated changes in immune-cell population in homeostatic bone. Concentrations of IL-1β, IL-9, IFNγ, and CCL3/MIP-1α increased with age in both male and female mice, whereas concentrations of IL-2, TNFα, TNFR1, IL-4, and IL-10 increased only in female mice - thus we termed these "age-accumulated" cytokines. There were no notable changes in immune cell populations nor cytokines within circulation during aging. Sex-dependent analysis demonstrated slight changes in immune cell and cytokine levels within bone and circulation, which were lost upon fracture injury. Fracture in young male mice caused a sharp decrease in number of M1 macrophages; however, this was not seen in aged male mice nor in female mice of any age. Injury itself induced a decrease in the number of CD8+ T cells within the local tissue of aged male and of female mice but not of young mice. Cytokine analysis of fractured mice revealed that age-accumulated cytokines quickly dissipated after fracture injury, and did not re-accumulate in newly regenerated tissue. Conversely, CXCL1/KC-GRO, CXCL2/MIP-2, IL-6, and CCL2/MCP-1 acted as "fracture response" cytokines: increasing sharply after fracture, eventually returning to baseline. Collectively, we classify measured cytokines into three groups: (1) age-accumulated cytokines, (2) female-specific age-accumulated cytokines, and (3) fracture response cytokines. These inflammatory molecules represent potential points of intervention to improve fracture healing outcome.
Collapse
Affiliation(s)
- Kristin Happ Molitoris
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Department of Pathology, Duke University, Durham, NC 27701, United States
| | - Abhinav Reddy Balu
- Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Mingjian Huang
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Department of Pathology, Duke University, Durham, NC 27701, United States
| | - Gurpreet Singh Baht
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Department of Pathology, Duke University, Durham, NC 27701, United States
| |
Collapse
|
2
|
Chandran M, Akesson KE, Javaid MK, Harvey N, Blank RD, Brandi ML, Chevalley T, Cinelli P, Cooper C, Lems W, Lyritis GP, Makras P, Paccou J, Pierroz DD, Sosa M, Thomas T, Silverman S. Impact of osteoporosis and osteoporosis medications on fracture healing: a narrative review. Osteoporos Int 2024:10.1007/s00198-024-07059-8. [PMID: 38587674 DOI: 10.1007/s00198-024-07059-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 03/06/2024] [Indexed: 04/09/2024]
Abstract
Antiresorptive medications do not negatively affect fracture healing in humans. Teriparatide may decrease time to fracture healing. Romosozumab has not shown a beneficial effect on human fracture healing. BACKGROUND Fracture healing is a complex process. Uncertainty exists over the influence of osteoporosis and the medications used to treat it on fracture healing. METHODS Narrative review authored by the members of the Fracture Working Group of the Committee of Scientific Advisors of the International Osteoporosis Foundation (IOF), on behalf of the IOF and the Société Internationale de Chirurgie Orthopédique et de Traumatologie (SICOT). RESULTS Fracture healing is a multistep process. Most fractures heal through a combination of intramembranous and endochondral ossification. Radiographic imaging is important for evaluating fracture healing and for detecting delayed or non-union. The presence of callus formation, bridging trabeculae, and a decrease in the size of the fracture line over time are indicative of healing. Imaging must be combined with clinical parameters and patient-reported outcomes. Animal data support a negative effect of osteoporosis on fracture healing; however, clinical data do not appear to corroborate with this. Evidence does not support a delay in the initiation of antiresorptive therapy following acute fragility fractures. There is no reason for suspension of osteoporosis medication at the time of fracture if the person is already on treatment. Teriparatide treatment may shorten fracture healing time at certain sites such as distal radius; however, it does not prevent non-union or influence union rate. The positive effect on fracture healing that romosozumab has demonstrated in animals has not been observed in humans. CONCLUSION Overall, there appears to be no deleterious effect of osteoporosis medications on fracture healing. The benefit of treating osteoporosis and the urgent necessity to mitigate imminent refracture risk after a fracture should be given prime consideration. It is imperative that new radiological and biological markers of fracture healing be identified. It is also important to synthesize clinical and basic science methodologies to assess fracture healing, so that a convergence of the two frameworks can be achieved.
Collapse
Affiliation(s)
- M Chandran
- Osteoporosis and Bone Metabolism Unit, Department of Endocrinology, Singapore General Hospital, DUKE NUS Medical School, Singapore, Singapore.
| | - K E Akesson
- Clinical and Molecular Osteoporosis Research Unit, Department of Clinical Sciences, Lund University, Department of Orthopedics, Skåne University Hospital, Malmö, Sweden
| | - M K Javaid
- NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Oxford, UK
| | - N Harvey
- MRC Lifecourse Epidemiology Centre, University of Southampton, NIHR Southampton Biomedical Research Centre, University of Southampton, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - R D Blank
- Garvan Institute of Medical Research, Medical College of Wisconsin, Darlinghurst, NSW, Australia
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - M L Brandi
- Department of Biomedical, Experimental and Clinical Sciences, University of Florence, Largo Palagi 1, Florence, Italy
| | - T Chevalley
- Division of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - P Cinelli
- Department of Trauma Surgery, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - C Cooper
- MRC Lifecourse Epidemiology Centre, University of Southampton, NIHR Southampton Biomedical Research Centre, University of Southampton, University Hospitals Southampton NHS Foundation Trust, Southampton, UK
- NIHR Oxford Biomedical Research Unit, University of Oxford, Oxford, UK
| | - W Lems
- Department of Rheumatology, Amsterdam UMC, Location VUmc, Amsterdam, The Netherlands
| | - G P Lyritis
- Hellenic Osteoporosis Foundation, Athens, Greece
| | - P Makras
- Department of Medical Research, 251 Hellenic Air Force & VA General Hospital, Athens, Greece
| | - J Paccou
- Department of Rheumatology, MABlab ULR 4490, CHU Lille, Univ. Lille, 59000, Lille, France
| | - D D Pierroz
- International Osteoporosis Foundation, Nyon, Switzerland
| | - M Sosa
- University of Las Palmas de Gran Canaria, Investigation Group on Osteoporosis and Mineral Metabolism, Canary Islands, Spain
| | - T Thomas
- Department of Rheumatology, North Hospital, CHU Saint-Etienne and INSERM U1059, University of Lyon-University Jean Monnet, Saint‑Etienne, France
| | - S Silverman
- Cedars-Sinai Medical Center and Geffen School of Medicine UCLA, Los Angeles, CA, USA
| |
Collapse
|
3
|
Jo S, Lee SH, Jeon C, Jo HR, You YJ, Lee JK, Sung IH, Kim TH, Lee CH. Myosin heavy chain 2 (MYH2) expression in hypertrophic chondrocytes of soft callus provokes endochondral bone formation in fracture. Life Sci 2023; 334:122204. [PMID: 37871676 DOI: 10.1016/j.lfs.2023.122204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/08/2023] [Accepted: 10/20/2023] [Indexed: 10/25/2023]
Abstract
AIMS Muscle-bone interactions during fracture healing are rarely known. Here we investigated the presence and significance of myosin heavy chain 2 (MYH2), a component of myosin derived from muscles, in fracture healing. MAIN METHODS We collected five hematoma and seven soft callus tissues from patients with distal radius fractures patients, randomly selected three of them, and performed a liquid chromatography-mass spectrometry (LC-MS) proteomics analysis. Proteomic results were validated by histological observation, immunohistochemistry, and immunofluorescence for MYH2 expression. These findings were further confirmed in a murine femoral fracture model in vivo and investigated using various methods in vitro. KEY FINDINGS The LC-MS proteomics analysis showed that MYH proteins were enriched in human soft calluses compared to hematoma. Notably, MYH2 protein is upregulated as high rank in each soft callus. The histological examination showed that MYH2 expression was elevated in hypertrophic chondrocytes within the human soft callus. Consistent with human data, Myh2 were significantly co-localized with Sox9 in hypertrophic chondrocytes of murine femoral fracture, in comparison to pre-hypertrophic and proliferating chondrocytes. Soluble MYH2 protein treatment increased MMP13 and RUNX2 expression in chondrocytes. In soluble MYH2 treatment, proliferation of chondrocytes was not altered, but the osteogenic and chondrogenic features of chondrocytes increased and decreased during differentiation, respectively. SIGNIFICANCE These findings indicate the potential of soluble MYH2 protein as a promising therapeutic strategy for promoting endochondral bone formation in chondrocytes following fracture.
Collapse
Affiliation(s)
- Sungsin Jo
- Hanyang University Institute for Rheumatology Research (HYIRR), Hanyang University, Seoul 04763, Republic of Korea
| | - Seung Hoon Lee
- Hanyang University Institute for Rheumatology Research (HYIRR), Hanyang University, Seoul 04763, Republic of Korea
| | - Chanhyeok Jeon
- Hanyang University Institute for Rheumatology Research (HYIRR), Hanyang University, Seoul 04763, Republic of Korea; Department of Translational Medicine, Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Hye-Ryeong Jo
- Hanyang University Institute for Rheumatology Research (HYIRR), Hanyang University, Seoul 04763, Republic of Korea
| | - Yong Jin You
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul 04763, Republic of Korea
| | - Jin Kyu Lee
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul 04763, Republic of Korea
| | - Il-Hoon Sung
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul 04763, Republic of Korea
| | - Tae-Hwan Kim
- Hanyang University Institute for Rheumatology Research (HYIRR), Hanyang University, Seoul 04763, Republic of Korea; Department of Translational Medicine, Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea; Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul 04763, Republic of Korea
| | - Chang-Hun Lee
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul 04763, Republic of Korea.
| |
Collapse
|
4
|
Chen J, Wang J, Wu X, Simon N, Svensson CI, Yuan J, Hart DA, Ahmed AS, Ackermann PW. eEF2 improves dense connective tissue repair and healing outcome by regulating cellular death, autophagy, apoptosis, proliferation and migration. Cell Mol Life Sci 2023; 80:128. [PMID: 37084140 PMCID: PMC10121543 DOI: 10.1007/s00018-023-04776-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 03/23/2023] [Accepted: 04/09/2023] [Indexed: 04/22/2023]
Abstract
Outcomes following human dense connective tissue (DCT) repair are often variable and suboptimal, resulting in compromised function and development of chronic painful degenerative diseases. Moreover, biomarkers and mechanisms that guide good clinical outcomes after DCT injuries are mostly unknown. Here, we characterize the proteomic landscape of DCT repair following human Achilles tendon rupture and its association with long-term patient-reported outcomes. Moreover, the potential regulatory mechanisms of relevant biomarkers were assessed partly by gene silencing experiments. A mass-spectrometry based proteomic approach quantified a large number (769) of proteins, including 51 differentially expressed proteins among 20 good versus 20 poor outcome patients. A novel biomarker, elongation factor-2 (eEF2) was identified as being strongly prognostic of the 1-year clinical outcome. Further bioinformatic and experimental investigation revealed that eEF2 positively regulated autophagy, cell proliferation and migration, as well as reduced cell death and apoptosis, leading to improved DCT repair and outcomes. Findings of eEF2 as novel prognostic biomarker could pave the way for new targeted treatments to improve healing outcomes after DCT injuries.Trial registration: NCT02318472 registered 17 December 2014 and NCT01317160 registered 17 March 2011, with URL http://clinicaltrials.gov/ct2/show/NCT02318472 and http://clinicaltrials.gov/ct2/show/study/NCT01317160 .
Collapse
Affiliation(s)
- Junyu Chen
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden.
| | - Jin Wang
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, People's Republic of China
- The Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, 310014, China
| | - Xinjie Wu
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden
- Peking University China-Japan Friendship School of Clinical Medicine, Beijing, 100029, China
| | - Nils Simon
- Department of Physiology and Pharmacology, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden
| | - Camilla I Svensson
- Department of Physiology and Pharmacology, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden
| | - Juan Yuan
- Department of Cell and Molecular Biology, Karolinska Institutet, 17176, Stockholm, Sweden
| | - David A Hart
- Department of Surgery, Faculty of Kinesiology, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Aisha S Ahmed
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden.
- Department of Physiology, University of Helsinki, Helsinki, Finland.
| | - Paul W Ackermann
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 171 76, Stockholm, Sweden
| |
Collapse
|
5
|
Wang Z, Zhang X, Cheng X, Ren T, Xu W, Li J, Wang H, Zhang J. Inflammation produced by senescent osteocytes mediates age-related bone loss. Front Immunol 2023; 14:1114006. [PMID: 36814916 PMCID: PMC9940315 DOI: 10.3389/fimmu.2023.1114006] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 01/11/2023] [Indexed: 02/08/2023] Open
Abstract
Purpose The molecular mechanisms of age-related bone loss are unclear and without valid drugs yet. The aims of this study were to explore the molecular changes that occur in bone tissue during age-related bone loss, to further clarify the changes in function, and to predict potential therapeutic drugs. Methods We collected bone tissues from children, middle-aged individuals, and elderly people for protein sequencing and compared the three groups of proteins pairwise, and the differentially expressed proteins (DEPs) in each group were analyzed by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG). K-means cluster analysis was then used to screen out proteins that continuously increased/decreased with age. Canonical signaling pathways that were activated or inhibited in bone tissue along with increasing age were identified by Ingenuity Pathway Analysis (IPA). Prediction of potential drugs was performed using the Connectivity Map (CMap). Finally, DEPs from sequencing were verified by Western blot, and the drug treatment effect was verified by quantitative real-time PCR. Results The GO and KEGG analyses show that the DEPs were associated with inflammation and bone formation with aging, and the IPA analysis shows that pathways such as IL-8 signaling and acute-phase response signaling were activated, while glycolysis I and EIF2 signaling were inhibited. A total of nine potential drugs were predicted, with rapamycin ranking the highest. In cellular experiments, rapamycin reduced the senescence phenotype produced by the H2O2-stimulated osteocyte-like cell MLO-Y4. Conclusion With age, inflammatory pathways are activated in bone tissue, and signals that promote bone formation are inhibited. This study contributes to the understanding of the molecular changes that occur in bone tissue during age-related bone loss and provides evidence that rapamycin is a drug of potential clinical value for this disease. The therapeutic effects of the drug are to be further studied in animals.
Collapse
Affiliation(s)
- Zixuan Wang
- Department of Emergency Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaofei Zhang
- Center for Translational Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xing Cheng
- Health Care Management Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Tianxing Ren
- Department of Emergency Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Weihua Xu
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jin Li
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hui Wang
- Department of Medical Genetics, Basic School of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China,*Correspondence: Jinxiang Zhang, ; Hui Wang,
| | - Jinxiang Zhang
- Department of Emergency Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China,*Correspondence: Jinxiang Zhang, ; Hui Wang,
| |
Collapse
|
6
|
Wang D, Dang CX, Hao YX, Yu X, Liu PF, Li JS. Relationship between osteoporosis and Cushing syndrome based on bioinformatics. Medicine (Baltimore) 2022; 101:e31283. [PMID: 36316863 PMCID: PMC9622631 DOI: 10.1097/md.0000000000031283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Many clinical studies have reported a relatively high incidence of osteoporosis and fragility fractures in patients with Cushing syndrome (CS). However, few papers have investigated osteoporosis and CS in terms of pathogenesis, so this study explores the association between the 2 and predicts upstream micro-ribonucleic acids (miRNAs) through bioinformatics, which provides potential targets for simultaneous pharmacological interventions in both diseases and also provides a basis for pathological screening. METHODS We used Genecards, Online Mendelian Inheritance in Man and Therapeutic Target Database databases to screen the targets of osteoporosis and Cushing syndrome; import target genes to Database for Annotation, Visualization and Integrated Discovery for Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway analysis; the intersecting genes were uploaded to Search Tool for the Retrieval of Genes and Genomes database to construct protein-protein interaction network; Cytoscape software was used to screen core genes, and Molecular Complex Detection module was used to analyze cluster modules; finally, the NetworkAnalyst data platform was used to predict the miRNAs that interact with core genes. RESULTS The core genes of osteoporosis and Cushing syndrome were insulin, tumor necrosis factor, signal transducer and activator of transcription 3 (STAT3), interleukin-6, insulin-like growth factor 1, etc. A total of 340 upstream miRNAs including hsa-let-7a-5p, hsa-mir-30a-5p and hsa-mir-125b-5p were predicted. The biological processes involved include regulating the transcription of ribonucleic acid polymerase II promoter and participating in the transduction of cytokine signaling pathways, which focus on the binding of nerve system ligand, JAK-STAT signaling pathway, Rap1 signaling pathway, PI3K-Akt signaling pathway, etc. CONCLUSION Osteoporosis and Cushing syndrome are closely related in terms of targets and molecular mechanisms. In this study, bioinformatics methods were used to identify their targets and mechanisms, providing potential targets for drug simultaneous regulation of the 2 diseases, and providing a new direction for exploring the relationship between diseases.
Collapse
Affiliation(s)
- Ding Wang
- Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Chun-Xiao Dang
- Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Ying-Xin Hao
- Anqiu Hospital of Traditional Chinese Medicine, Weifang, China
| | - Xiao Yu
- Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Peng-Fei Liu
- Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Jin-Song Li
- Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
- * Correspondence: Jin-Song Li, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jingshi Road No. 16369, Jinan 250014, China (e-mail: )
| |
Collapse
|
7
|
Knox AM, McGuire AC, Natoli RM, Kacena MA, Collier CD. Methodology, selection, and integration of fracture healing assessments in mice. J Orthop Res 2021; 39:2295-2309. [PMID: 34436797 PMCID: PMC8542592 DOI: 10.1002/jor.25172] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 08/02/2021] [Accepted: 08/13/2021] [Indexed: 02/04/2023]
Abstract
Long bone fractures are one of the most common and costly medical conditions encountered after trauma. Characterization of the biology of fracture healing and development of potential medical interventions generally involves animal models of fracture healing using varying genetic or treatment groups, then analyzing relative repair success via the synthesis of diverse assessment methodologies. Murine models are some of the most widely used given their low cost, wide variety of genetic variants, and rapid breeding and maturation. This review addresses key concerns regarding fracture repair investigations in mice and may serve as a guide in conducting and interpreting such studies. Specifically, this review details the procedures, highlights relevant parameters, and discusses special considerations for the selection and integration of the major modalities used for quantifying fracture repair in such studies, including X-ray, microcomputed tomography, histomorphometric, biomechanical, gene expression and biomarker analyses.
Collapse
Affiliation(s)
- Adam M. Knox
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Anthony C. McGuire
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Roman M. Natoli
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
| | - Melissa A. Kacena
- Department of Orthopaedic Surgery, Indiana University School of Medicine, IN, USA
- Richard L. Roudebush VA Medical Center, IN, USA
| | | |
Collapse
|
8
|
Generation and Experimental Outcomes of Closed Femoral Fracture in Mice. Methods Mol Biol 2021. [PMID: 32979206 DOI: 10.1007/978-1-0716-0989-7_13] [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: 10/13/2023]
Abstract
Fracture healing requires the integration of many cell types, growth factors, and cytokines that cannot be adequately studied using in vitro and in silico models. This has prompted the development of highly informative in vivo animal models to understand the complexities of fracture repair. Here, we describe a modified procedure for mice, first developed for rats by Bonnarens and Einhorn, that does not require a skin incision or suturing. This procedure involves boring a hole through the skin and articular surface of the femoral condyle with a 25-gauge needle, fixation with a K-wire, and creation of a transverse mid-diaphyseal fracture using a three-point bending fracture device. Fracture healing can be assessed using a variety of techniques, including microcomputed tomography, torsion testing, histological and histomorphometric analyses, and assessment of gene expression. There are many orthopedic trauma applications of this murine femoral fracture model ranging from assessment of safety and efficacy of novel therapeutics to the influence of specific genes on bone repair.
Collapse
|
9
|
Abstract
PURPOSE OF REVIEW The failure of bony union following a fracture, termed a fracture nonunion, has severe patient morbidity and economic consequences. This review describes current consensuses and future directions of investigation for determining why, detecting when, and effective treatment if this complication occurs. RECENT FINDINGS Current nonunion investigation is emphasizing an expanded understanding of the biology of healing. This has led to assessments of the immune environment, multiple cytokines and morphogenetic factors, and the role of skeletogenic stem cells in the development of nonunion. Detecting biological markers and other objective diagnostic criteria is also a current objective of nonunion research. Treatment approaches in the near future will likely be dominated by the development of specific adjunct therapies to the nonunion surgical management, which will be informed by an expanded mechanistic understanding of nonunion biology. Current consensus among orthopedists is that improved diagnosis and treatment of nonunion hinges first on discoveries at the bench side with later translation to the clinic.
Collapse
Affiliation(s)
- G Bradley Reahl
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, MA, 02118, USA.
| | - Louis Gerstenfeld
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Michael Kain
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, MA, 02118, USA.
| |
Collapse
|
10
|
Li L, Tang P, Zhou Z, Wang Q, Xu T, Zhao S, Huang Y, Kong F, Liu W, Cheng L, Zhou Z, Zhao X, Gu C, Luo Y, Tao G, Qian D, Chen J, Fan J, Yin G. GIT1 regulates angiogenic factor secretion in bone marrow mesenchymal stem cells via NF-κB/Notch signalling to promote angiogenesis. Cell Prolif 2019; 52:e12689. [PMID: 31502302 PMCID: PMC6869488 DOI: 10.1111/cpr.12689] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 07/23/2019] [Accepted: 08/11/2019] [Indexed: 12/24/2022] Open
Abstract
Objectives Osteogenesis is coupled with angiogenesis during bone remodelling. G‐protein‐coupled receptor (GPCR) kinase 2‐interacting protein‐1 (GIT1) is an important protein that participates in fracture healing by regulating angiogenesis. This study investigated whether GIT1 could affect bone mesenchymal stem cells (BMSCs) to secrete angiogenic factors to enhance fracture healing by promoting angiogenesis and its possible mechanism. Materials and methods The angiogenesis of mice post‐fracture was detected by micro‐CT and immunofluorescence. Subsequently, vascular endothelial growth factor (VEGF) level in mouse and human BMSCs (hBMSCs) under TNF‐α stimulation was detected. The hBMSCs were transfected with GIT1 shRNAs to further explore the relationship between GIT1 and VEGF and angiogenesis in vitro. Furthermore, based on previous research on GIT1, possible signal pathways were investigated. Results GIT1 knockout mice exhibited impaired angiogenesis and delayed fracture healing. And GIT1 deficiency remarkably reduced the expression of VEGF mRNA in BMSCs, which affected the proliferation and migration of human umbilical vein endothelial cells. GIT1 knockdown inhibited the activation of Notch and NF‐κB signals by decreasing nuclear transportation of NICD and P65/P50, respectively. Overexpression of the canonical NF‐κB subunits P65 and P50 markedly increased NICD‐dependent activation of recombination signal‐binding protein‐jκ reporter. Finally, GIT1 enhanced the affinity of NF‐κB essential modulator (NEMO) for K63‐linked ubiquitin chains via interaction with NEMO coiled‐coil 2 domains. Conclusion These data revealed a positive role for GIT1 by modulating the Notch/NF‐κB signals which promoting paracrine of BMSCs to enhance angiogenesis and fracture healing.
Collapse
Affiliation(s)
- Linwei Li
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Pengyu Tang
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zheng Zhou
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Qian Wang
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Tao Xu
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Shujie Zhao
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yifan Huang
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Fanqi Kong
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Wei Liu
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Lin Cheng
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Zhimin Zhou
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Xuan Zhao
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Changjiang Gu
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yongjun Luo
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Gaojian Tao
- Department of Pain, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing, China
| | - Dingfei Qian
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jian Chen
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jin Fan
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Guoyong Yin
- Department of Orthopedic, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| |
Collapse
|
11
|
Nielson CM, Jacobs JM, Orwoll ES. Proteomic studies of bone and skeletal health outcomes. Bone 2019; 126:18-26. [PMID: 30954730 PMCID: PMC7302501 DOI: 10.1016/j.bone.2019.03.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 03/26/2019] [Accepted: 03/26/2019] [Indexed: 12/12/2022]
Abstract
Proteins are an essential part of essentially all biological processes, and there is enormous variation in protein forms and concentrations that is not reflected in DNA or RNA. Recently there have been rapid advances in the ability to measure protein sequence, modification and concentration, particularly with methods based in mass spectrometry. Global measures of proteins in tissues or in the circulation provide a broad assessment of the proteome that can be extremely useful for discovery, and targeted proteomic measures can yield specific and sensitive assessments of specific peptides and proteins. While most proteomic measures are directed at the detection of consensus peptide sequences, mass spectrometry based proteomic methods also allow a detailed examination of the peptide sequence differences that result from genetic variants and that may have important effects on protein function. In evaluating proteomic data, a number of analytical considerations are important, including an understanding of missing data, the challenge of multiple testing and replication, and the use of rapidly evolving methods in systems biology. While proteomics has not yet had a major impact in skeletal research, interesting recent research has used these approaches in the study of bone cell biology and the discovery of biomarkers of skeletal disorders. Proteomics can be expected to have an increasing influence in the study of bone biology and pathophysiology.
Collapse
Affiliation(s)
| | - Jon M Jacobs
- Pacific Northwest National Laboratory, Richland, WA, USA
| | | |
Collapse
|