1
|
Diwan B, Yadav R, Goyal R, Sharma R. Sustained exposure to high glucose induces differential expression of cellular senescence markers in murine macrophages but impairs immunosurveillance response to senescent cells secretome. Biogerontology 2024; 25:627-647. [PMID: 38240923 DOI: 10.1007/s10522-024-10092-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Accepted: 01/02/2024] [Indexed: 07/02/2024]
Abstract
The influence of chronic diseases on various facets of macrophage cellular senescence is poorly understood. This study evaluated the impact of chronic hyperglycemia on the induction of cellular senescence and subsequent immunosurveillance functions in RAW264.7 macrophages. Macrophages were cultured under normal glucose (NG; 5 mM), high glucose (HG; 20 mM), and very high glucose (VHG; 40 mM) conditions and assessed for markers of cellular senescence. Hyperglycemia induced strong upregulation of SA-β-gal activity, and loss of PCNA and Lamin B1 gene expression while markers of cell cycle arrest generally decreased. Non-significant changes in SASP-related proteins were observed while ROS levels slightly decreased and mitochondrial membrane potential increased. Protein concentration on the exosome membrane surface and their stability appeared to increase under hyperglycemic conditions. However, when macrophages were exposed to the secretory media (SM) of senescent preadipocytes, a dramatic increase in the levels of all inflammatory proteins was recorded especially in the VHG group that was also accompanied by upregulation of NF-κB and NLRP3 gene expression. SM treatment to hyperglycemic macrophages activated the TLR-2/Myd88 pathway but decreased the expression of scavenger receptors RAGE, CD36, and Olr-1 while CD44 and CXCL16 expression increased. On exposure to LPS, a strong upregulation in NO, ROS, and inflammatory cytokines was observed. Together, these results suggest that primary markers of cellular senescence are aberrantly expressed under chronic hyperglycemic conditions in macrophages with no significant SASP activation. Nonetheless, hyperglycemia strongly deregulates macrophage functions leading to impaired immunosurveillance of senescent cells and aggravation of inflamm-aging. This work provides novel insights into how hyperglycemia-induced dysfunctions can impact the potency of macrophages to manage senescent cell burden in aging tissues.
Collapse
Affiliation(s)
- Bhawna Diwan
- Nutrigerontology Laboratory, Faculty of Applied Sciences & Biotechnology, Shoolini University, Solan, 173229, India
| | - Rahul Yadav
- Nutrigerontology Laboratory, Faculty of Applied Sciences & Biotechnology, Shoolini University, Solan, 173229, India
| | - Rohit Goyal
- School of Pharmaceutical Sciences, Shoolini University, Solan, 173229, India
| | - Rohit Sharma
- Nutrigerontology Laboratory, Faculty of Applied Sciences & Biotechnology, Shoolini University, Solan, 173229, India.
| |
Collapse
|
2
|
Batoon L, Hawse JR, McCauley LK, Weivoda MM, Roca H. Efferocytosis and Bone Dynamics. Curr Osteoporos Rep 2024:10.1007/s11914-024-00878-y. [PMID: 38914730 DOI: 10.1007/s11914-024-00878-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/13/2024] [Indexed: 06/26/2024]
Abstract
PURPOSE OF REVIEW This review summarizes the recently published scientific evidence regarding the role of efferocytosis in bone dynamics and skeletal health. RECENT FINDINGS Several types of efferocytes have been identified within the skeleton, with macrophages being the most extensively studied. Efferocytosis is not merely a 'clean-up' process vital for maintaining skeletal homeostasis; it also plays a crucial role in promoting resolution pathways and orchestrating bone dynamics, such as osteoblast-osteoclast coupling during bone remodeling. Impaired efferocytosis has been associated with aging-related bone loss and various skeletal pathologies, including osteoporosis, osteoarthritis, rheumatoid arthritis, and metastatic bone diseases. Accordingly, emerging evidence suggests that targeting efferocytic mechanisms has the potential to alleviate these conditions. While efferocytosis remains underexplored in the skeleton, recent discoveries have shed light on its pivotal role in bone dynamics, with important implications for skeletal health and pathology. However, there are several knowledge gaps and persisting technical limitations that must be addressed to fully unveil the contributions of efferocytosis in bone.
Collapse
Affiliation(s)
- Lena Batoon
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA.
| | - John R Hawse
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA
- Department of Pathology, Medical School, University of Michigan, Ann Arbor, MI, 48104, USA
| | - Megan M Weivoda
- Division of Hematology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, MI, 48109-1078, USA.
| |
Collapse
|
3
|
Rattanaprukskul K, Xia XJ, Jiang M, Albuquerque-Souza E, Bandyopadhyay D, Sahingur SE. Molecular Signatures of Senescence in Periodontitis: Clinical Insights. J Dent Res 2024:220345241255325. [PMID: 38877743 DOI: 10.1177/00220345241255325] [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: 06/16/2024] Open
Abstract
Most of the elderly population is afflicted by periodontal diseases, creating a health burden worldwide. Cellular senescence is one of the hallmarks of aging and associated with several chronic comorbidities. Senescent cells produce a variety of deleterious secretions, collectively termed the senescence-associated secretory phenotype (SASP). This disrupts neighboring cells, leading to further senescence propagation and inciting chronic inflammation, known as "inflammaging." Detrimental repercussions within the tissue microenvironment can trigger senescence at a younger age, accelerate biological aging, and drive the initiation or progression of diseases. Here, we investigated the biological signatures of senescence in healthy and diseased gingival tissues by assessing the levels of key senescence markers (p16, lipofuscin, and β-galactosidase) and inflammatory mediators (interleukin [IL]-1β, IL-6, IL-8, matrix metalloproteinase [MMP]-1, MMP-3, and tumor necrosis factor-α). Our results showed significantly increased senescence features including p16, lipofuscin, and β-galactosidase in both epithelial and connective tissues of periodontitis patients compared with healthy sites in all age groups, indicating that an inflammatory microenvironment can trigger senescence-like alterations in younger diseased gingival tissues as well. Subsequent analyses using double staining with specific cell markers noted the enrichment of β-galactosidase in fibroblasts and macrophages. Concurrently, inflammatory mediators consistent with SASP were increased in the gingival biopsies obtained from periodontitis lesions. Together, our findings provide the first clinical report revealing susceptibility to elevated senescence and inflammatory milieu consistent with senescence secretome in gingival tissues, thus introducing senescence as one of the drivers of pathological events in the oral mucosa and a novel strategy for targeted interventions.
Collapse
Affiliation(s)
- K Rattanaprukskul
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Periodontology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - X-J Xia
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - M Jiang
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - E Albuquerque-Souza
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Lipid Mediator Unit, William Harvey Research Institute, Queen Mary University of London, London, UK
| | - D Bandyopadhyay
- Department of Biostatistics, School of Population Health, Virginia Commonwealth, Richmond, VA, USA
| | - S E Sahingur
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
| |
Collapse
|
4
|
Clark D, Brazina S, Miclau T, Park S, Hsieh CL, Nakamura M, Marcucio R. Age-related changes to macrophage subpopulations and TREM2 dysregulation characterize attenuated fracture healing in old mice. Aging Cell 2024:e14212. [PMID: 38825965 DOI: 10.1111/acel.14212] [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: 02/06/2024] [Revised: 04/11/2024] [Accepted: 05/10/2024] [Indexed: 06/04/2024] Open
Abstract
Fracture healing complications increase with age, with higher rates of delayed unions and nonunions and an associated increase in morbidity and mortality in older adults. Macrophages have a dynamic role in fracture healing, and we have previously demonstrated that age-related changes in macrophages are associated with attenuated fracture repair in old mice. Here, we provide a single cell characterization of the immune cells involved in the early phase of fracture healing. We show that there were multiple transcriptionally distinct macrophage subpopulations present simultaneously within the healing tissue. Fracture healing was attenuated in old mice compared to young, and macrophages from the fracture callus of old mice demonstrated a pro-inflammatory phenotype compared to young. Interestingly, Trem2 expression was decreased in old macrophages compared to young. Young mice lacking Trem2 demonstrated attenuated fracture healing and inflammatory dysregulation similar to old mice. Trem2 dysregulation has previously been implicated in other age-related diseases, but its role in fracture healing is unknown. This work provides a robust characterization of the macrophage subpopulations involved in fracture healing, and further reveals the important role of Trem2 in fracture healing and may be a potential driver of age-related inflammatory dysregulation. Future work may further examine macrophages and Trem2 as potential therapeutic targets for management of fracture repair in older adults.
Collapse
Affiliation(s)
- Daniel Clark
- Center for Craniofacial Regeneration, University of Pittsburgh School of Dental Medicine, Pittsburgh, Pennsylvania, USA
- Department of Periodontics and Preventive Dentistry, University of Pittsburgh School of Dental Medicine, Pittsburgh, Pennsylvania, USA
| | - Sloane Brazina
- Department of Obstetrics and Gynecology, University of California Davis, Sacramento, California, USA
| | - Ted Miclau
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, School of Medicine, University of California San Francisco, Zuckerberg San Francisco General Hospital, San Francisco, California, USA
| | - Sangmin Park
- Center for Craniofacial Regeneration, University of Pittsburgh School of Dental Medicine, Pittsburgh, Pennsylvania, USA
| | - Christine L Hsieh
- Division of Rheumatology, Department of Medicine, University of California San Francisco, San Francisco VA Health Care System, San Francisco, California, USA
| | - Mary Nakamura
- Division of Rheumatology, Department of Medicine, University of California San Francisco, San Francisco VA Health Care System, San Francisco, California, USA
| | - Ralph Marcucio
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, School of Medicine, University of California San Francisco, Zuckerberg San Francisco General Hospital, San Francisco, California, USA
| |
Collapse
|
5
|
Molitoris KH, Huang M, Baht GS. Osteoimmunology of Fracture Healing. Curr Osteoporos Rep 2024; 22:330-339. [PMID: 38616228 PMCID: PMC11186872 DOI: 10.1007/s11914-024-00869-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/26/2024] [Indexed: 04/16/2024]
Abstract
PURPOSE OF REVIEW The purpose of this review is to summarize what is known in the literature about the role inflammation plays during bone fracture healing. Bone fracture healing progresses through four distinct yet overlapping phases: formation of the hematoma, development of the cartilaginous callus, development of the bony callus, and finally remodeling of the fracture callus. Throughout this process, inflammation plays a critical role in robust bone fracture healing. RECENT FINDINGS At the onset of injury, vessel and matrix disruption lead to the generation of an inflammatory response: inflammatory cells are recruited to the injury site where they differentiate, activate, and/or polarize to secrete cytokines for the purposes of cell signaling and cell recruitment. This process is altered by age and by sex. Bone fracture healing is heavily influenced by the presence of inflammatory cells and cytokines within the healing tissue.
Collapse
Affiliation(s)
- Kristin Happ Molitoris
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Duke University, 300 North Duke Street, Durham, NC, 27701, USA
| | - Mingjian Huang
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Duke University, 300 North Duke Street, Durham, NC, 27701, USA
| | - Gurpreet Singh Baht
- Department of Orthopaedic Surgery, Duke Molecular Physiology Institute, Duke University, 300 North Duke Street, Durham, NC, 27701, USA.
| |
Collapse
|
6
|
Duke VR, Philippon MJ, Lind DRG, Kasler H, Yamaura K, Huard M, Czachor M, Hollenbeck J, Brown J, Garcia A, Fukase N, Marcucio RS, Nelson AL, Hambright WS, Snapper DM, Huard J, Bahney CS. Murine Progeria Model Exhibits Delayed Fracture Healing with Dysregulated Local Immune Response. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.29.596277. [PMID: 38854043 PMCID: PMC11160782 DOI: 10.1101/2024.05.29.596277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Background Bone fracture is one of the most globally prevalent injuries, with an estimated 189 million bone fractures occurring annually. Delayed union or nonunion occurs in up to 15% of fractures and involves the interruption or complete failure of bone continuity following fracture. Preclinical testing is essential to support the translation of novel strategies to promote improved fracture repair treatment, but there is a paucity of small animal models that recapitulate clinical attributes associated with delayed fracture healing. This study explores whether the Zmpste24 -/- (Z24 -/- ) knockout mouse model of Hutchinson-Gilford progeria syndrome presents with delayed fracture healing. Leveraging the previously characterized Z24 -/- phenotype of genomic instability, epigenetic changes, and fragility, we hypothesize that these underlying alterations will lead to significantly delayed fracture healing relative to age-matched wild type (WT) controls. Methods WT and Z24 -/- mice received intramedullary fixed tibia fractures at ∼12 weeks of age. Mice were sacrificed throughout the time course of repair for the collection of organs that would provide information regarding the local (fracture callus, bone marrow, inguinal lymph nodes) versus peripheral (peripheral blood, contralateral tibia, abdominal organs) tissue microenvironments. Analyses of these specimens include histomorphometry, μCT, mechanical strength testing, protein quantification, gene expression analysis, flow cytometry for cellular senescence, and immunophenotyping. Results Z24 -/- mice demonstrated a significantly delayed rate of healing compared to WT mice with consistently smaller fracture calli containing higher proportion of cartilage and less bone after injury. Cellular senescence and pro-inflammatory cytokines were elevated in the Z24 -/- mice before and after fracture. These mice further presented with a dysregulated immune system, exhibiting generally decreased lymphopoiesis and increased myelopoiesis locally in the bone marrow, with more naïve and less memory T cell but greater myeloid activation systemically in the peripheral blood. Surprisingly, the ipsilateral lymph nodes had increased T cell activation and other pro-inflammatory NK and myeloid cells, suggesting that elevated myeloid abundance and activation contributes to an injury-specific hyperactivation of T cells. Conclusion Taken together, these data establish the Z24 -/- progeria mouse as a model of delayed fracture healing that exhibits decreased bone in the fracture callus, with weaker overall bone quality, immune dysregulation, and increased cellular senescence. Based on this mechanism for delayed healing, we propose this Z24 -/- progeria mouse model could be useful in testing novel therapeutics that could address delayed healing. The Translational Potential of this Article This study employs a novel animal model for delayed fracture healing that researchers can use to screen fracture healing therapeutics to address the globally prevalent issue of aberrant fracture healing.
Collapse
|
7
|
Hachemi Y, Perrin S, Ethel M, Julien A, Vettese J, Geisler B, Göritz C, Colnot C. Multimodal analyses of immune cells during bone repair identify macrophages as a therapeutic target in musculoskeletal trauma. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.04.29.591608. [PMID: 38746344 PMCID: PMC11092472 DOI: 10.1101/2024.04.29.591608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Musculoskeletal traumatic injuries (MTI) involve soft tissue lesions adjacent to a bone fracture leading to fibrous nonunion. The impact of MTI on the inflammatory response to fracture and on the immunomodulation of skeletal stem/progenitor cells (SSPCs) remains unknown. Here, we used single cell transcriptomic analyses to describe the immune cell dynamics after bone fracture and identified distinct macrophage subsets with successive pro-inflammatory, pro-repair and anti-inflammatory profiles. Concurrently, SSPCs transition via a pro- and anti-inflammatory fibrogenic phase of differentiation prior to osteochondrogenic differentiation. In a preclinical MTI mouse model, the injury response of immune cells and SSPCs is disrupted leading to a prolonged pro-inflammatory phase and delayed resolution of inflammation. Macrophage depletion improves bone regeneration in MTI demonstrating macrophage involvement in fibrous nonunion. Finally, pharmacological inhibition of macrophages using the CSF1R inhibitor Pexidartinib ameliorates healing. These findings reveal the coordinated immune response of macrophages and skeletal stem/progenitor cells as driver of bone healing and as a primary target for the treatment of trauma-associated fibrosis. Summary Hachemi et al. report the immune cell atlas of bone repair revealing macrophages as pro-fibrotic regulators and a therapeutic target for musculoskeletal regeneration. Genetic depletion or pharmacological inhibition of macrophages improves bone healing in musculoskeletal trauma.
Collapse
|
8
|
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
|
9
|
Xiao B, Liu Y, Chandrasiri I, Adjei-Sowah E, Mereness J, Yan M, Benoit DSW. Bone-Targeted Nanoparticle Drug Delivery System-Mediated Macrophage Modulation for Enhanced Fracture Healing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2305336. [PMID: 37797180 PMCID: PMC10922143 DOI: 10.1002/smll.202305336] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 09/03/2023] [Indexed: 10/07/2023]
Abstract
Despite decades of progress, developing minimally invasive bone-specific drug delivery systems (DDS) to improve fracture healing remains a significant clinical challenge. To address this critical therapeutic need, nanoparticle (NP) DDS comprised of poly(styrene-alt-maleic anhydride)-b-poly(styrene) (PSMA-b-PS) functionalized with a peptide that targets tartrate-resistant acid phosphatase (TRAP) and achieves preferential fracture accumulation has been developed. The delivery of AR28, a glycogen synthase kinase-3 beta (GSK3β) inhibitor, via the TRAP binding peptide-NP (TBP-NP) expedites fracture healing. Interestingly, however, NPs are predominantly taken up by fracture-associated macrophages rather than cells typically associated with fracture healing. Therefore, the underlying mechanism of healing via TBP-NP is comprehensively investigated herein. TBP-NPAR28 promotes M2 macrophage polarization and enhances osteogenesis in preosteoblast-macrophage co-cultures in vitro. Longitudinal analysis of TBP-NPAR28 -mediated fracture healing reveals distinct spatial distributions of M2 macrophages, an increased M2/M1 ratio, and upregulation of anti-inflammatory and downregulated pro-inflammatory genes compared to controls. This work demonstrates the underlying therapeutic mechanism of bone-targeted NP DDS, which leverages macrophages as druggable targets and modulates M2 macrophage polarization to enhance fracture healing, highlighting the therapeutic benefit of this approach for fractures and bone-associated diseases.
Collapse
Affiliation(s)
- Baixue Xiao
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
| | - Yuxuan Liu
- Materials Science Program, University of Rochester, Rochester, NY, 14623, USA
| | - Indika Chandrasiri
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
| | - Emmanuela Adjei-Sowah
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
| | - Jared Mereness
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
| | - Ming Yan
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
| | - Danielle S W Benoit
- Department of Biomedical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, 14623, USA
- Materials Science Program, University of Rochester, Rochester, NY, 14623, USA
- Department of Chemical Engineering, University of Rochester, Rochester, NY, 14623, USA
- Department of Bioengineering, Phil and Penny Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR, 97403, USA
| |
Collapse
|
10
|
Zweifler LE, Sinder BP, Stephan C, Koh AJ, Do J, Ulrich E, Grewal J, Woo C, Batoon L, Kozloff K, Roca H, Mishina Y, McCauley LK. Parathyroid hormone and trabectedin have differing effects on macrophages and stress fracture repair. Bone 2024; 179:116983. [PMID: 38013019 DOI: 10.1016/j.bone.2023.116983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 10/25/2023] [Accepted: 11/23/2023] [Indexed: 11/29/2023]
Abstract
Stress fractures occur as a result of repeated mechanical stress on bone and are commonly found in the load-bearing lower extremities. Macrophages are key players in the immune system and play an important role in bone remodeling and fracture healing. However, the role of macrophages in stress fractures has not been adequately addressed. We hypothesize that macrophage infiltration into a stress fracture callus site promotes bone healing. To test this, a unilateral stress fracture induction model was employed in which the murine ulna of four-month-old, C57BL/6 J male mice was repeatedly loaded with a pre-determined force until the bone was displaced a distance below the threshold for complete fracture. Mice were treated daily with parathyroid hormone (PTH, 50 μg/kg/day) starting two days before injury and continued until 24 h before euthanasia either four or six days after injury, or treated with trabectedin (0.15 mg/kg) on the day of stress fracture and euthanized three or seven days after injury. These treatments were used due to their established effects on macrophages. While macrophages have been implicated in the anabolic effects of PTH, trabectedin, an FDA approved chemotherapeutic, compromises macrophage function and reduces bone mass. At three- and four-days post injury, callus macrophage numbers were analyzed histologically. There was a significant increase in macrophages with PTH treatment compared to vehicle in the callus site. By one week of healing, treatments differentially affected the bony callus as analyzed by microcomputed tomography. PTH enhanced callus bone volume. Conversely, callus bone volume was decreased with trabectedin treatment. Interestingly, concurrent treatment with PTH and trabectedin rescued the reduction observed in the callus with trabectedin treatment alone. This study reports on the key involvement of macrophages during stress fracture healing. Given these observed outcomes on macrophage physiology and bone healing, these findings may be important for patients actively receiving either of these FDA-approved therapeutics.
Collapse
Affiliation(s)
- Laura E Zweifler
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Benjamin P Sinder
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Chris Stephan
- Department of Orthopedic Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Amy J Koh
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Justin Do
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Emily Ulrich
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Jobanpreet Grewal
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Cecilia Woo
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Lena Batoon
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Kenneth Kozloff
- Department of Orthopedic Surgery, University of Michigan, Ann Arbor, MI, United States of America
| | - Hernan Roca
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America.
| | - Yuji Mishina
- Department of Biologic and Materials Science, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America
| | - Laurie K McCauley
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, United States of America; Department of Pathology, University of Michigan, Medical School, Ann Arbor, MI, United States of America
| |
Collapse
|
11
|
Xiao B, Adjei-Sowah E, Benoit DSW. Integrating osteoimmunology and nanoparticle-based drug delivery systems for enhanced fracture healing. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2024; 56:102727. [PMID: 38056586 PMCID: PMC10872334 DOI: 10.1016/j.nano.2023.102727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/23/2023] [Accepted: 11/27/2023] [Indexed: 12/08/2023]
Abstract
Fracture healing is a complex interplay of molecular and cellular mechanisms lasting from days to weeks. The inflammatory phase is the first stage of fracture healing and is critical in setting the stage for successful healing. There has been growing interest in exploring the role of the immune system and novel therapeutic strategies, such as nanoparticle drug delivery systems in enhancing fracture healing. Advancements in nanotechnology have revolutionized drug delivery systems to the extent that they can modulate immune response during fracture healing by leveraging unique physiochemical properties. Therefore, understanding the intricate interactions between nanoparticle-based drug delivery systems and the immune response, specifically macrophages, is essential for therapeutic efficacy. This review provides a comprehensive overview of the relationship between the immune system and nanoparticles during fracture healing. Specifically, we highlight the influence of nanoparticle characteristics, such as size, surface properties, and composition, on macrophage activation, polarization, and subsequent immune responses. IMPACT STATEMENT: This review provides valuable insights into the interplay between fracture healing, the immune system, and nanoparticle-based drug delivery systems. Understanding nanoparticle-macrophage interactions can advance the development of innovative therapeutic approaches to enhance fracture healing, improve patient outcomes, and pave the way for advancements in regenerative medicine.
Collapse
Affiliation(s)
- Baixue Xiao
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14623, USA; Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY 14623, USA
| | - Emmanuela Adjei-Sowah
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14623, USA; Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY 14623, USA
| | - Danielle S W Benoit
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14623, USA; Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY 14623, USA; Department of Chemical Engineering, University of Rochester, Rochester, NY 14623, USA; Materials Science Program, University of Rochester, Rochester, NY 14623, USA; Department of Bioengineering, Phil and Penny Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USA.
| |
Collapse
|
12
|
Zou NY, Liu R, Huang M, Jiao YR, Wei J, Jiang Y, He WZ, Huang M, Xu YL, Liu L, Sun YC, Yang M, Guo Q, Huang Y, Su T, Xiao Y, Wang WS, Zeng C, Lei GH, Luo XH, Li CJ. Age-related secretion of grancalcin by macrophages induces skeletal stem/progenitor cell senescence during fracture healing. Bone Res 2024; 12:6. [PMID: 38267422 PMCID: PMC10808101 DOI: 10.1038/s41413-023-00309-1] [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: 07/20/2023] [Revised: 12/01/2023] [Accepted: 12/05/2023] [Indexed: 01/26/2024] Open
Abstract
Skeletal stem/progenitor cell (SSPC) senescence is a major cause of decreased bone regenerative potential with aging, but the causes of SSPC senescence remain unclear. In this study, we revealed that macrophages in calluses secrete prosenescent factors, including grancalcin (GCA), during aging, which triggers SSPC senescence and impairs fracture healing. Local injection of human rGCA in young mice induced SSPC senescence and delayed fracture repair. Genetic deletion of Gca in monocytes/macrophages was sufficient to rejuvenate fracture repair in aged mice and alleviate SSPC senescence. Mechanistically, GCA binds to the plexin-B2 receptor and activates Arg2-mediated mitochondrial dysfunction, resulting in cellular senescence. Depletion of Plxnb2 in SSPCs impaired fracture healing. Administration of GCA-neutralizing antibody enhanced fracture healing in aged mice. Thus, our study revealed that senescent macrophages within calluses secrete GCA to trigger SSPC secondary senescence, and GCA neutralization represents a promising therapy for nonunion or delayed union in elderly individuals.
Collapse
Affiliation(s)
- Nan-Yu Zou
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Ran Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Mei Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yu-Rui Jiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Jie Wei
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, Hunan, 410008, China
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, China
| | - Yangzi Jiang
- School of Biomedical Sciences, Institute for Tissue Engineering and Regenerative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Wen-Zhen He
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Min Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yi-Li Xu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Ling Liu
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yu-Chen Sun
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Mi Yang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Qi Guo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Yan Huang
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Tian Su
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Ye Xiao
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
| | - Wei-Shan Wang
- Department of Orthopaedics, The First Affiliated Hospital of Shihezi University, Shihezi, Xinjiang, China
| | - Chao Zeng
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, Hunan, 410008, China
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Guang-Hua Lei
- Department of Orthopaedics, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Joint Degeneration and Injury, Changsha, Hunan, 410008, China
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Xiang-Hang Luo
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China.
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
| | - Chang-Jun Li
- Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha, Hunan, 410008, China.
- Key Laboratory of Aging-related Bone and Joint Diseases Prevention and Treatment, Ministry of Education, Xiangya Hospital, Central South University, Changsha, China.
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
| |
Collapse
|
13
|
Kannari L, Marttila E, Oksa M, Furuholm J, Snäll J. Non-Surgical Site-Related Complications in Mandibular Fracture Surgery - A Problem of Elderly Patients? J Oral Maxillofac Surg 2024; 82:47-55. [PMID: 38164998 DOI: 10.1016/j.joms.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 09/29/2023] [Accepted: 10/07/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND Scientific evidence of nonsurgical site-related complications in mandibular fracture patients is limited. PURPOSE The purpose was to measure the frequency of nonsurgical site complications in patients with mandible fractures, describe the types of complications, and identify the risk factors associated with these complications. STUDY DESIGN, SETTING, SAMPLE A retrospective cohort study was conducted at the Helsinki University hospital between 2018 and 2021. Patients undergoing surgery with open reduction and internal fixation of mandibular fracture(s) were evaluated. Patients under 16 years of age were excluded. PREDICTOR VARIABLE Primary predictor variable was age. Patient-related predictor variables were sex, long-term disease(s), smoking, and alcohol and/or drug abuse. Injury and fracture-related variables were injury mechanism, type and site of facture, combined craniofacial fracture(s), and associated injury(s). MAIN OUTCOME VARIABLE(S) The primary outcome variable was nonsurgical site-related postoperative complication. The secondary outcome variable was type of complication. COVARIATES Not applicable. ANALYSES The main outcome variable was cross tabulated for pairwise comparisons with predictor variables. Multivariate logistic regression was performed for statistically significant (P < .05) variables. RESULTS The data included 314 patients (age range: 16 to 89 years; mean age: 38 years old; median age: 33 years old); most (78.3%) were men. Nonsurgical site-related postoperative complications occurred in 6.7% of patients. The most common complication type was pulmonary complication (36.0%), followed by urinary complication (20.0%) and general infection (16.0%). Nonsurgical site-related postoperative complications were most likely to occur in patients who were elderly (adjusted odds ratio [aOR] 5.55; 95% CI 1.92 to 16.21; P = .002), had combined craniofacial fractures (aOR 2.92; 95% CI 1.06 to 8.03; P = .038), and abused alcohol or drugs (aOR 4.51; 95% CI 1.70 to 11.96; P = .003). Pulmonary complications occurred more often in elderly patients, whereas urinary complications were more common in younger patients. CONCLUSIONS AND RELEVANCE The types of nonsurgical site complications in mandibular fracture patients increase and vary according to the patient's age. Awareness of possible complications related to different age groups helps anticipate and identify these in clinical work, and to consider the overall treatment of the patient beyond the fracture.
Collapse
Affiliation(s)
- Leena Kannari
- Researcher, Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
| | - Emilia Marttila
- Consultant, Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Marko Oksa
- Researcher, Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Jussi Furuholm
- Researcher, Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Johanna Snäll
- Associate Professor (tenure-track), Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| |
Collapse
|
14
|
Mangione MC, Wen J, Cao DJ. Mechanistic target of rapamycin in regulating macrophage function in inflammatory cardiovascular diseases. J Mol Cell Cardiol 2024; 186:111-124. [PMID: 38039845 PMCID: PMC10843805 DOI: 10.1016/j.yjmcc.2023.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 10/14/2023] [Accepted: 10/18/2023] [Indexed: 12/03/2023]
Abstract
The mechanistic target of rapamycin (mTOR) is evolutionarily conserved from yeast to humans and is one of the most fundamental pathways of living organisms. Since its discovery three decades ago, mTOR has been recognized as the center of nutrient sensing and growth, homeostasis, metabolism, life span, and aging. The role of dysregulated mTOR in common diseases, especially cancer, has been extensively studied and reported. Emerging evidence supports that mTOR critically regulates innate immune responses that govern the pathogenesis of various cardiovascular diseases. This review discusses the regulatory role of mTOR in macrophage functions in acute inflammation triggered by ischemia and in atherosclerotic cardiovascular disease (ASCVD) and heart failure with preserved ejection fraction (HFpEF), in which chronic inflammation plays critical roles. Specifically, we discuss the role of mTOR in trained immunity, immune senescence, and clonal hematopoiesis. In addition, this review includes a discussion on the architecture of mTOR, the function of its regulatory complexes, and the dual-arm signals required for mTOR activation to reflect the current knowledge state. We emphasize future research directions necessary to understand better the powerful pathway to take advantage of the mTOR inhibitors for innovative applications in patients with cardiovascular diseases associated with aging and inflammation.
Collapse
Affiliation(s)
- MariaSanta C Mangione
- Department of Internal Medicine, Cardiology Division, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jinhua Wen
- Department of Internal Medicine, Cardiology Division, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Dian J Cao
- Department of Internal Medicine, Cardiology Division, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; VA North Texas Health Care System, Dallas TX 75216, USA.
| |
Collapse
|
15
|
Pius AK, Toya M, Gao Q, Ergul YS, Chow SKH, Goodman SB. Effects of Aging on Osteosynthesis at Bone-Implant Interfaces. Biomolecules 2023; 14:52. [PMID: 38254652 PMCID: PMC10813487 DOI: 10.3390/biom14010052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/23/2023] [Accepted: 12/27/2023] [Indexed: 01/24/2024] Open
Abstract
Joint replacement is a common surgery and is predominantly utilized for treatment of osteoarthritis in the aging population. The longevity of many of these implants depends on bony ingrowth. Here, we provide an overview of current techniques in osteogenesis (inducing bone growth onto an implant), which is affected by aging and inflammation. In this review we cover the biologic underpinnings of these processes as well as the clinical applications. Overall, aging has a significant effect at the cellular and macroscopic level that impacts osteosynthesis at bone-metal interfaces after joint arthroplasty; potential solutions include targeting prolonged inflammation, preventing microbial adhesion, and enhancing osteoinductive and osteoconductive properties.
Collapse
Affiliation(s)
- Alexa K. Pius
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
| | - Masakazu Toya
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
| | - Qi Gao
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
| | - Yasemin Sude Ergul
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
| | - Simon Kwoon-Ho Chow
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
| | - Stuart Barry Goodman
- Department of Orthopaedic Surgery, School of Medicine, Stanford University, Stanford, CA 94063, USA (Y.S.E.)
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| |
Collapse
|
16
|
Wang S, Heng K, Song X, Zhai J, Zhang H, Geng Q. Lycopene Improves Bone Quality in SAMP6 Mice by Inhibiting Oxidative Stress, Cellular Senescence, and the SASP. Mol Nutr Food Res 2023; 67:e2300330. [PMID: 37880898 DOI: 10.1002/mnfr.202300330] [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: 05/21/2023] [Revised: 09/17/2023] [Indexed: 10/27/2023]
Abstract
SCOPE Cellular senescence (CS) is closely related to tissue ageing including bone ageing. CS and the senescence-associated secretory phenotype (SASP) have emerged as critical pathogenesis elements of senile osteoporosis. This study aims to investigate the effect of lycopene on senile osteoporosis. METHODS AND RESULTS The senescence-accelerated mouse prone 6 (SAMP6) strain of mice is used as the senile osteoporosis model. Daily ingestion of lycopene for 8 weeks preserves the bone mass, density, strength, and microarchitecture in the SAMP6 mice. Moreover, these alterations are associated with a decrease in oxidative stress in the senile osteoporosis model. In addition, there is a reduction in osteoblast and osteocyte senescence and the SASP in the bone tissues of the SAMP6 mice. Lycopene improves bone health likely due to its antioxidant properties that may be linked with the regulation of CS and SASP in the SAMP6 mice. CONCLUSION These results suggest that lycopene may be beneficial for the management of senile osteoporosis by inhibiting oxidative stress, CS, and the SASP.
Collapse
Affiliation(s)
- Shen Wang
- Key Laboratory of Clinical Research of Osteoporosis, Xuzhou Medical University, Xuzhou, 221300, China
- Central Lab, Pizhou Hospital, Xuzhou Medical University, Xuzhou, 221300, China
- Department of Orthopedics and Trauma, Peking University People's Hospital, Beijing, 100044, China
- Key Laboratory of Trauma and Neural Regeneration, Ministry of Education, Beijing, 100044, China
- National Center for Trauma Medicine, Beijing, 100044, China
| | - Ke Heng
- Department of Orthopedics, Changzhou Second Hospital, Nanjing Medical University, Changzhou, 213000, China
| | - Xingchen Song
- Key Laboratory of Clinical Research of Osteoporosis, Xuzhou Medical University, Xuzhou, 221300, China
- Central Lab, Pizhou Hospital, Xuzhou Medical University, Xuzhou, 221300, China
| | - Juan Zhai
- Key Laboratory of Clinical Research of Osteoporosis, Xuzhou Medical University, Xuzhou, 221300, China
- Central Lab, Pizhou Hospital, Xuzhou Medical University, Xuzhou, 221300, China
| | - Huanyu Zhang
- Key Laboratory of Clinical Research of Osteoporosis, Xuzhou Medical University, Xuzhou, 221300, China
- Central Lab, Pizhou Hospital, Xuzhou Medical University, Xuzhou, 221300, China
| | - Qinghe Geng
- Key Laboratory of Clinical Research of Osteoporosis, Xuzhou Medical University, Xuzhou, 221300, China
- Central Lab, Pizhou Hospital, Xuzhou Medical University, Xuzhou, 221300, China
| |
Collapse
|
17
|
Pappert M, Khosla S, Doolittle M. Influences of Aged Bone Marrow Macrophages on Skeletal Health and Senescence. Curr Osteoporos Rep 2023; 21:771-778. [PMID: 37688671 PMCID: PMC10724341 DOI: 10.1007/s11914-023-00820-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/25/2023] [Indexed: 09/11/2023]
Abstract
PURPOSE OF REVIEW The purpose of this review is to discuss the role of macrophages in the regulation of skeletal health with age, particularly in regard to both established and unexplored mechanisms in driving inflammation and senescence. RECENT FINDINGS A multitude of research has uncovered mechanisms of intrinsic aging in macrophages, detrimental factors released by these immune cells, and crosstalk from senescent mesenchymal cell types, which altogether drive age-related bone loss. Furthermore, bone marrow macrophages were recently proposed to be responsible for the megakaryocytic shift during aging and overall maintenance of the hematopoietic niche. Studies on extra-skeletal macrophages have shed light on possible conserved mechanisms within bone and highlight the importance of these cells in systemic aging. Macrophages are a critically important cell type in maintaining skeletal homeostasis with age. New discoveries in this area are of utmost importance in fully understanding the pathogenesis of osteoporosis in aged individuals.
Collapse
Affiliation(s)
- Moritz Pappert
- Division of Endocrinology, Diabetes and Metabolism, Mayo Clinic, Rochester, MN, USA
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA
- Department of Medicine, Paracelsus Medical University, Salzburg, Austria
| | - Sundeep Khosla
- Division of Endocrinology, Diabetes and Metabolism, Mayo Clinic, Rochester, MN, USA
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA
| | - Madison Doolittle
- Division of Endocrinology, Diabetes and Metabolism, Mayo Clinic, Rochester, MN, USA.
- Robert and Arlene Kogod Center On Aging, Mayo Clinic, Rochester, MN, USA.
| |
Collapse
|
18
|
Gong JS, Zhu GQ, Zhang Y, Chen B, Liu YW, Li HM, He ZH, Zou JT, Qian YX, Zhu S, Hu XY, Rao SS, Cao J, Xie H, Wang ZX, Du W. Aptamer-functionalized hydrogels promote bone healing by selectively recruiting endogenous bone marrow mesenchymal stem cells. Mater Today Bio 2023; 23:100854. [PMID: 38024846 PMCID: PMC10665677 DOI: 10.1016/j.mtbio.2023.100854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 10/22/2023] [Accepted: 11/01/2023] [Indexed: 12/01/2023] Open
Abstract
Bone regeneration heavily relies on bone marrow mesenchymal stem cells (BMSCs). However, recruiting endogenous BMSCs for in situ bone regeneration remains challenging. In this study, we developed a novel BMSC-aptamer (BMSC-apt) functionalized hydrogel (BMSC-aptgel) and evaluated its functions in recruiting BMSCs and promoting bone regeneration. The functional hydrogels were synthesized between maleimide-terminated 4-arm polyethylene glycols (PEG) and thiol-flanked PEG crosslinker, allowing rapid in situ gel formation. The aldehyde group-modified BMSC-apt was covalently bonded to a thiol-flanked PEG crosslinker to produce high-density aptamer coverage on the hydrogel surface. In vitro and in vivo studies demonstrated that the BMSC-aptgel significantly increased BMSC recruitment, migration, osteogenic differentiation, and biocompatibility. In vivo fluorescence tomography imaging demonstrated that functionalized hydrogels effectively recruited DiR-labeled BMSCs at the fracture site. Consequently, a mouse femur fracture model significantly enhanced new bone formation and mineralization. The aggregated BMSCs stimulated bone regeneration by balancing osteogenic and osteoclastic activities and reduced the local inflammatory response via paracrine effects. This study's findings suggest that the BMSC-aptgel can be a promising and effective strategy for promoting in situ bone regeneration.
Collapse
Affiliation(s)
- Jiang-Shan Gong
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Guo-Qiang Zhu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Yu Zhang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Bei Chen
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Yi-Wei Liu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Hong-Ming Li
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Ze-Hui He
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Jing-Tao Zou
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Yu-Xuan Qian
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Sheng Zhu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Xin-Yue Hu
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
| | - Shan-Shan Rao
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha, Hunan, 410008, China
| | - Jia Cao
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha, Hunan, 410008, China
| | - Hui Xie
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha, Hunan, 410008, China
| | - Zhen-Xing Wang
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha, Hunan, 410008, China
| | - Wei Du
- Department of Orthopedics, Movement System Injury and Repair Research Center, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
- Hunan Key Laboratory of Angmedicine, Changsha, Hunan, 410008, China
- National Clinical Research Center for Geriatric Disorders (Xiangya Hospital), Changsha, Hunan, 410008, China
- Department of Rehabilitation Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| |
Collapse
|
19
|
Menger MM, Tobias AL, Bauer D, Bleimehl M, Scheuer C, Menger MD, Histing T, Laschke MW. Parathyroid hormone stimulates bone regeneration in an atrophic non-union model in aged mice. J Transl Med 2023; 21:844. [PMID: 37996876 PMCID: PMC10668449 DOI: 10.1186/s12967-023-04661-y] [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: 08/21/2023] [Accepted: 10/26/2023] [Indexed: 11/25/2023] Open
Abstract
BACKGROUND Non-union formation still represents a major burden in trauma and orthopedic surgery. Moreover, aged patients are at an increased risk for bone healing failure. Parathyroid hormone (PTH) has been shown to accelerate fracture healing in young adult animals. However, there is no information whether PTH also stimulates bone regeneration in atrophic non-unions in the aged. Therefore, the aim of the present study was to analyze the effect of PTH on bone regeneration in an atrophic non-union model in aged CD-1 mice. METHODS After creation of a 1.8 mm segmental defect, mice femora were stabilized by pin-clip fixation. The animals were treated daily with either 200 mg/kg body weight PTH 1-34 (n = 17) or saline (control; n = 17) subcutaneously. Bone regeneration was analyzed by means of X-ray, biomechanics, micro-computed tomography (µCT) imaging as well as histological, immunohistochemical and Western blot analyses. RESULTS In PTH-treated animals bone formation was markedly improved when compared to controls. This was associated with an increased bending stiffness as well as a higher number of tartrate-resistant acid phosphatase (TRAP)-positive osteoclasts and CD31-positive microvessels within the callus tissue. Furthermore, PTH-treated aged animals showed a decreased inflammatory response, characterized by a lower number of MPO-positive granulocytes and CD68-positive macrophages within the bone defects when compared to controls. Additional Western blot analyses demonstrated a significantly higher expression of cyclooxygenase (COX)-2 and phosphoinositide 3-kinase (PI3K) in PTH-treated mice. CONCLUSION Taken together, these findings indicate that PTH is an effective pharmacological compound for the treatment of non-union formation in aged animals.
Collapse
Affiliation(s)
- Maximilian M Menger
- Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, 72076, Tuebingen, Germany.
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany.
| | - Anne L Tobias
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| | - David Bauer
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| | - Michelle Bleimehl
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| | - Claudia Scheuer
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| | - Michael D Menger
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| | - Tina Histing
- Department of Trauma and Reconstructive Surgery, Eberhard Karls University Tuebingen, BG Trauma Center Tuebingen, 72076, Tuebingen, Germany
| | - Matthias W Laschke
- Institute for Clinical and Experimental Surgery, Saarland University, 66421, Homburg/Saar, Germany
| |
Collapse
|
20
|
Wu S, Ohba S, Matsushita Y. Single-Cell RNA-Sequencing Reveals the Skeletal Cellular Dynamics in Bone Repair and Osteoporosis. Int J Mol Sci 2023; 24:9814. [PMID: 37372962 DOI: 10.3390/ijms24129814] [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: 04/28/2023] [Revised: 05/29/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
The bone is an important organ that performs various functions, and the bone marrow inside the skeleton is composed of a complex intermix of hematopoietic, vascular, and skeletal cells. Current single-cell RNA sequencing (scRNA-seq) technology has revealed heterogeneity and sketchy differential hierarchy of skeletal cells. Skeletal stem and progenitor cells (SSPCs) are located upstream of the hierarchy and differentiate into chondrocytes, osteoblasts, osteocytes, and bone marrow adipocytes. In the bone marrow, multiple types of bone marrow stromal cells (BMSCs), which have the potential of SSPCs, are spatiotemporally located in distinct areas, and SSPCs' potential shift of BMSCs may occur with the advancement of age. These BMSCs contribute to bone regeneration and bone diseases, such as osteoporosis. In vivo lineage-tracing technologies show that various types of skeletal lineage cells concomitantly gather and contribute to bone regeneration. In contrast, these cells differentiate into adipocytes with aging, leading to senile osteoporosis. scRNA-seq analysis has revealed that alteration in the cell-type composition is a major cause of tissue aging. In this review, we discuss the cellular dynamics of skeletal cell populations in bone homeostasis, regeneration, and osteoporosis.
Collapse
Affiliation(s)
- Sixun Wu
- Department of Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8588, Japan
| | - Shinsuke Ohba
- Department of Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8588, Japan
- Department of Tissue and Developmental Biology, Osaka University Graduate School of Dentistry, Osaka 565-0871, Japan
| | - Yuki Matsushita
- Department of Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki 852-8588, Japan
| |
Collapse
|
21
|
Yang Y, Zhao N, Wang R, Zhan Z, Guo S, Song H, Wiemer EAC, Ben J, Ma J. Macrophage MVP regulates fracture repair by promoting M2 polarization via JAK2-STAT6 pathway. Int Immunopharmacol 2023; 120:110313. [PMID: 37267856 DOI: 10.1016/j.intimp.2023.110313] [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: 12/18/2022] [Revised: 04/19/2023] [Accepted: 05/07/2023] [Indexed: 06/04/2023]
Abstract
OBJECTIVE Major vault protein (MVP) is vital in various macrophage-related inflammatory diseases. However, the effects of MVP on macrophage polarization during fracture repair are still unknown. METHODS We used Mvpflox/floxLyz2-Cre mice (myeloid-specific MVP gene knockout, abbreviated as MacKO) and Mvpflox/flox (abbreviated as MacWT) mice to compare their fracture healing phenotype. Next, we traced the changes in macrophage immune status in vivo and in vitro. We further explored the effects of MVP on osteogenesis and osteoclastogenesis. Finally, we re-expressed MVP in MacKO mice to confirm the role of MVP in fracture healing. RESULTS The lack of MVP in macrophages impaired their transition from a pro-inflammatory to an anti-inflammatory phenotype during fracture repair. The increased secretion of pro-inflammatory cytokines by macrophages promoted their osteoclastic differentiation and impaired BMSC osteogenic differentiation, ultimately leading to impaired fracture repair in MacKO mice. Last, adeno-associated virus (AAV)-Mvp tibial injection significantly promoted fracture repair in MacKO mice. CONCLUSIONS Our findings showed MVP has a previously unknown immunomodulatory role in macrophages during fracture repair. Targeting macrophage MVP may represent a novel therapeutic method for fracture treatment.
Collapse
Affiliation(s)
- Yan Yang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Na Zhao
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Ruobing Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Zhuorong Zhan
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Shuyu Guo
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Haiyang Song
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Erik A C Wiemer
- Department of Medical Oncology, Erasmus MC Cancer Institute, University Medical Center Rotterdam, the Netherlands
| | - Jingjing Ben
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Nanjing Medical University, China
| | - Junqing Ma
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China; Department of Orthodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
| |
Collapse
|
22
|
Song Z, Cheng Y, Chen M, Xie X. Macrophage polarization in bone implant repair: A review. Tissue Cell 2023; 82:102112. [PMID: 37257287 DOI: 10.1016/j.tice.2023.102112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 04/10/2023] [Accepted: 05/15/2023] [Indexed: 06/02/2023]
Abstract
Macrophages (MΦ) are highly adaptable and functionally polarized cells that play a crucial role in various physiological and pathological processes. Typically, MΦ differentiate into two distinct subsets: the proinflammatory (M1) and anti-inflammatory (M2) phenotypes. Due to their potent immunomodulatory and anti-inflammatory properties, MΦ have garnered significant attention in recent decades. In the context of bone implant repair, the immunomodulatory function of MΦ is of paramount importance. Depending on their polarization phenotype, MΦ can exert varying effects on osteogenesis, angiogenesis, and the inflammatory response around the implant. This paper provides an overview of the immunomodulatory and inflammatory effects of MΦ polarization in the repair of bone implants.
Collapse
Affiliation(s)
- Zhengzheng Song
- Central South University Xiangya Stomatological Hospital, Central South University, Changsha 410078, Hunan, China; Xiangya School of Stomatology, Central South University, Changsha 410008, Hunan, China
| | - Yuxi Cheng
- Central South University Xiangya Stomatological Hospital, Central South University, Changsha 410078, Hunan, China; Xiangya School of Stomatology, Central South University, Changsha 410008, Hunan, China
| | - Minmin Chen
- Central South University Xiangya Stomatological Hospital, Central South University, Changsha 410078, Hunan, China.
| | - Xiaoli Xie
- Central South University Xiangya Stomatological Hospital, Central South University, Changsha 410078, Hunan, China; Hunan Key Laboratory of Oral Health Research, Changsha 410008, Hunan, China.
| |
Collapse
|
23
|
Clement ND, Gaston MS, Simpson AH. Fractures in elderly mice demonstrate delayed ossification of the soft callus: a cellular and radiographic study. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY & TRAUMATOLOGY : ORTHOPEDIE TRAUMATOLOGIE 2023; 33:977-985. [PMID: 35239001 PMCID: PMC10125932 DOI: 10.1007/s00590-022-03235-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 02/14/2022] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The aim of this study was to assess the cellular age-related changes in fracture repair and relate these to the observed radiographic assessments at differing time points. METHODS Transverse traumatic tibial diaphyseal fractures were created in 12-14 weeks old (young n = 16) and 18 months old (elderly n = 20) in Balb/C wild mice. Fracture calluses were harvested at five time points from 1 to 35 days post fracture for histomorphometry (percent of cartilage and bone), radiographic analysis (total callus volume, callus index, and relative bone mineral content). RESULTS The elderly mice produced an equal amount of cartilage when compared to young mice (p > 0.08). However, by day 21 there was a significantly greater percentage of bone at the fracture site in the young group (mean percentage 50% versus 11%, p < 0.001). It was not until day 35 when the elderly group produced a similar amount of bone compared to the young group at 21 days (50% versus 53%, non-significant (ns)). The callus area and callus index on radiographic assessment was not significantly different between young and elderly groups at any time point. Relative bone mineral content was significantly greater in the young group at 14 days (545.7 versus -120.2, p < 0.001) and 21 days (888.7 versus 451.0, p < 0.001) when compared to the elderly group. It was not until day 35 when the elderly group produced a similar relative bone mineral content as the young group at 21 days (888.7 versus 921.8, ns). CONCLUSIONS Elderly mice demonstrated a delay in endochondral ossification which was associated with a decreased relative bone mineral content at the fracture site and may help assess these cellular changes in a clinical setting.
Collapse
Affiliation(s)
- N. D. Clement
- Department of Orthopaedics and Trauma, University of Edinburgh, Little France, Edinburgh, EH16 4SA UK
| | - M. S. Gaston
- Department of Orthopaedics and Trauma, University of Edinburgh, Little France, Edinburgh, EH16 4SA UK
| | - A. H. Simpson
- Department of Orthopaedics and Trauma, University of Edinburgh, Little France, Edinburgh, EH16 4SA UK
| |
Collapse
|
24
|
Avin KG, Dominguez JM, Chen NX, Hato T, Myslinski JJ, Gao H, Liu Y, McKinley TO, Brown KM, Moe SM, Natoli RM. Single-cell RNAseq provides insight into altered immune cell populations in human fracture nonunions. J Orthop Res 2023; 41:1060-1069. [PMID: 36200412 PMCID: PMC10335365 DOI: 10.1002/jor.25452] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 09/16/2022] [Accepted: 09/22/2022] [Indexed: 02/04/2023]
Abstract
Nonunion describes bone fractures that fail to heal, resulting in the fracture callus failing to fully ossify or, in atrophic cases, not forming altogether. Fracture healing is regulated, in part, by the balance of proinflammatory and anti-inflammatory processes occurring within the bone marrow and surface cell populations. We sought to further understand the role of osteoimmunology (i.e., study of the close relationship between the immune system and bone) by examining immune cell gene expression via single-cell RNA sequencing of intramedullary canal tissue obtained from human patients with femoral nonunions. Intramedullary canal tissue samples obtained by reaming were collected at the time of surgical repair for femur fracture nonunion (n = 5) or from native bone controls when harvesting autologous bone graft (n = 4). Cells within the samples were isolated and analyzed using the Chromium Single-Cell System (10x Genomics Inc.) and Illumina sequencers. Twenty-three distinct cell clusters were identified, with higher cell proportions in the nonunion samples for monocytes and CD14 + dendritic cells (DCs), and lower proportions of T cells, myelocytes, and promyelocytes in nonunion samples. Gene expression differences were identified in each of the cell clusters from cell types associated with osteoimmunology, including CD14 + DC, monocytes, T cells, promyelocytes, and myelocytes. These results provide human-derived gene profiles that can further our understanding of pathways that may be a cause or a consequence of nonunion, providing the clinical rationale to focus on specific components of osteoimmunology. Clinical significance: The novel single-cell approach may lead to clinically relevant diagnostic biomarkers during earlier stages of nonunion development and/or investigation into therapeutic options.
Collapse
Affiliation(s)
- Keith G. Avin
- Department of Physical Therapy, School of Health and Human Sciences, Indiana University, Indianapolis, Indiana, USA
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - James M. Dominguez
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Neal X. Chen
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Takashi Hato
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Jered J. Myslinski
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Hongyu Gao
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Yunlong Liu
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Todd O. McKinley
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Krista M. Brown
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Sharon M. Moe
- Division of Nephrology, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| | - Roman M. Natoli
- Department of Orthopaedic Surgery, School of Medicine, Indiana University, Indianapolis, Indiana, USA
| |
Collapse
|
25
|
Clark D, Doelling J, Hu D, Miclau T, Nakamura M, Marcucio R. Age-related decrease in periostin expression may be associated with attenuated fracture healing in old mice. J Orthop Res 2023; 41:1022-1032. [PMID: 36058631 PMCID: PMC10411536 DOI: 10.1002/jor.25439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 08/16/2022] [Accepted: 08/29/2022] [Indexed: 02/04/2023]
Abstract
Older adults suffer more bone fractures with higher rates of healing complications and increased risk of morbidity and mortality. An improved understanding of the cellular and molecular mechanism of fracture healing and how such processes are perturbed with increasing age may allow for better treatment options to manage fractures in older adults. Macrophages are attractive therapeutics due to their role in several phases of fracture healing. After injury, bone marrow-derived macrophages are recruited to the injury and propagate the inflammatory response, contribute to resolution of inflammation, and promote bone regeneration. A tissue resident population of macrophages named osteal macrophages are present in the periosteum and are directly associated with osteoblasts and these cells contribute to bone formation. Here, we utilized bulk RNA sequencing to analyze the transcriptional activity of osteal macrophages from old and young mice present in primary calvarial cultures. Macrophages demonstrated a diverse transcriptional profile, expressing genes involved in immune function as well as wound healing and regeneration. Periostin was significantly downregulated in macrophages from old mice compared to young. Periostin is an extracellular matrix protein with important functions that promote osteoblast activity during bone regeneration. An age-related decrease of periostin expression was verified in the fracture callus of old mice compared to young. Young periostin knockout mice demonstrated attenuated fracture healing outcomes that reflected what is observed in old mice. This study supports an important role of periostin in fracture healing, and therapeutically targeting the age-related decrease in periostin may improve healing outcomes in older populations.
Collapse
Affiliation(s)
- Daniel Clark
- Department of Periodontics and Preventive Dentistry, School of Dental Medicine, University of Pittsburgh. 335 Sutherland Dr. Pittsburgh, PA 15261, USA
| | - Jeffrey Doelling
- College of Medicine, California Northstate University, 9700 West Taron Dr. Elk Grove, CA 95758, USA
| | - Diane Hu
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, School of Medicine, University of California San Francisco, Zuckerberg San Francisco General Hospital, 2550 23rd St. San Francisco, CA, 94110, USA
| | - Theodore Miclau
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, School of Medicine, University of California San Francisco, Zuckerberg San Francisco General Hospital, 2550 23rd St. San Francisco, CA, 94110, USA
| | - Mary Nakamura
- Division of Rheumatology, Department of Medicine, San Francisco VA Health Care System, 4150 Clement St. San Francisco, California, 94121 USA
| | - Ralph Marcucio
- Orthopaedic Trauma Institute, Department of Orthopaedic Surgery, School of Medicine, University of California San Francisco, Zuckerberg San Francisco General Hospital, 2550 23rd St. San Francisco, CA, 94110, USA
| |
Collapse
|
26
|
Buunaaim ADB, Osman I, Salisu WJ, Bukari MIS, Yempabe T. Epidemiology of elderly fractures in a tertiary hospital in Northern Ghana: a 3-year retrospective descriptive review. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY & TRAUMATOLOGY : ORTHOPEDIE TRAUMATOLOGIE 2023; 33:473-479. [PMID: 36527505 DOI: 10.1007/s00590-022-03450-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 11/27/2022] [Indexed: 12/23/2022]
Abstract
PURPOSE The incidence of elderly fractures is closely related to the increasing proportion of the elderly population in sub-Saharan Africa, making it a relevant public health concern. Epidemiological profiles of these fractures and treatment options are necessary for resource-poor settings to optimise planning and patient care. METHODS A retrospective descriptive cross-sectional study was conducted at Tamale Teaching Hospital. Data of 69 elderly patients (60 years and above) with fractures admitted to the trauma and orthopaedic unit from January 2017 to December 2019 were collected. Simple descriptive and bivariate analysis was conducted on some variables, whereas the Chi-square was used to test for some associations for categorical data. RESULTS The mean age of the study participants was 70.3(± 8.6). Elderly males (55.1%) were three times more likely to sustain fractures than females. The primary mechanism of injury was a road traffic accident (RTA) (59.4%), followed by falls from slips (29.0%). There was a significant association between gender and mechanisms (RTA and Falls from slips) of injury (p = 0.002). The most fractured bone was the femur (50.7%). Hip fractures (33.3%) were more common among females than males and mainly among the (71-80) age group. Open fractures were more common among males than females. CONCLUSION RTAs were the most typical cause of fractures in the elderly. Contrary to other studies, males were more commonly involved in accidents than females, albeit females were the majority for hip fractures. Therefore, significant public health policies with resource allocation should address the unmet health needs of this unique age group in our growing populations in low- and middle-income countries.
Collapse
Affiliation(s)
- A D B Buunaaim
- Department of Surgery/Department Physician Assistant Studies, School of Medicine, University for Development Studies, Tamale, Ghana.
- Department of Surgery, Trauma/Orthopaedic Unit, Tamale Teaching Hospital, Tamale, Ghana.
| | - I Osman
- Department of Surgery, Trauma/Orthopaedic Unit, Tamale Teaching Hospital, Tamale, Ghana
| | - W J Salisu
- Department of Nursing, Tamale Teaching Hospital, Tamale, Ghana
| | - M I S Bukari
- Department of Surgery/Department Physician Assistant Studies, School of Medicine, University for Development Studies, Tamale, Ghana
| | - T Yempabe
- Department of Surgery, Trauma/Orthopaedic Unit, Tamale Teaching Hospital, Tamale, Ghana
| |
Collapse
|
27
|
Xiao B, Liu Y, Chandrasiri I, Overby C, Benoit DSW. Impact of Nanoparticle Physicochemical Properties on Protein Corona and Macrophage Polarization. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 36916683 DOI: 10.1021/acsami.2c22471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Macrophages, the major component of the mononuclear phagocyte system, uptake and clear systemically administered nanoparticles (NPs). Therefore, leveraging macrophages as a druggable target may be advantageous to enhance NP-mediated drug delivery. Despite many studies focused on NP-cell interactions, NP-mediated macrophage polarization mechanisms are still poorly understood. This work aimed to explore the effect of NP physicochemical parameters (size and charge) on macrophage polarization. Upon exposure to biological fluids, proteins rapidly adsorb to NPs and form protein coronas. To this end, we hypothesized that NP protein coronas govern NP-macrophage interactions, uptake, and subsequent macrophage polarization. To test this hypothesis, model polystyrene NPs with various charges and sizes, as well as NPs relevant to drug delivery, were utilized. Data suggest that cationic NPs potentiate both M1 and M2 macrophage markers, while anionic NPs promote M1-to-M2 polarization. Additionally, anionic polystyrene nanoparticles (APNs) of 50 nm exhibit the greatest influence on M2 polarization. Proteomics was pursued to further understand the effect of NPs physicochemical parameters on protein corona, which revealed unique protein patterns based on NP charge and size. Several proteins impacting M1 and M2 macrophage polarization were identified within cationic polystyrene nanoparticles (CPNs) corona, while APNs corona included fewer M1 but more M2-promoting proteins. Nevertheless, size impacts protein corona abundance but not identities. Altogether, protein corona identities varied based on NP surface charge and correlated to dramatic differences in macrophage polarization. In contrast, NP size differentially impacts macrophage polarization, which is dominated by NP uptake level rather than protein corona. In this work, specific corona proteins were identified as a function of NP physicochemical properties. These proteins are correlated to specific macrophage polarization programs and may provide design principles for developing macrophage-mediated NP drug delivery systems.
Collapse
Affiliation(s)
- Baixue Xiao
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14623, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York 14623, United States
| | - Yuxuan Liu
- Materials Science Program, University of Rochester, Rochester, New York 14623, United States
| | - Indika Chandrasiri
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14623, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York 14623, United States
| | - Clyde Overby
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14623, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York 14623, United States
| | - Danielle S W Benoit
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14623, United States
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York 14623, United States
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14623, United States
- Materials Science Program, University of Rochester, Rochester, New York 14623, United States
- Phil and Penny Knight Campus for Accelerating Scientific Impact, Department of Bioengineering, University of Oregon, Eugene, Oregon 97403, United States
| |
Collapse
|
28
|
Frade BB, Dias RB, Gemini Piperni S, Bonfim DC. The role of macrophages in fracture healing: a narrative review of the recent updates and therapeutic perspectives. Stem Cell Investig 2023; 10:4. [PMID: 36817259 PMCID: PMC9936163 DOI: 10.21037/sci-2022-038] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 01/10/2023] [Indexed: 02/10/2023]
Abstract
Objective This review addresses the latest advances in research on the role of macrophages in fracture healing, exploring their relationship with failures in bone consolidation and the perspectives for the development of advanced and innovative therapies to promote bone regeneration. Background The bone can fully restore its form and function after a fracture. However, the regenerative process of fracture healing is complex and is influenced by several factors, including macrophage activity. These cells have been found in the fracture site at all stages of bone regeneration, and their general depletion or the knockdown of receptors that mediate their differentiation, polarization, and/or function result in impaired fracture healing. Methods The literature search was carried out in the PubMed database, using combinations of the keywords "macrophage", "fracture healing, "bone regeneration", and "bone repair". Articles published within the last years (2017-2022) reporting evidence from in vivo long bone fracture healing experiments were included. Conclusions Studies published in the last five years on the role of macrophages in fracture healing strengthened the idea that what appears to be essential when it comes to a successful consolidation is the right balance between the M1/M2 populations, which have different but complementary roles in the process. These findings opened promising new avenues for the development of several macrophage-targeted therapies, including the administration of molecules and/or biomaterials intended to regulate macrophage differentiation and polarization, the local transplantation of macrophage precursors, and the use of exosomes to deliver signaling molecules that influence macrophage activities. However, more research is still warranted to better understand the diversity of macrophage phenotypes and their specific roles in each step of fracture healing and to decipher the key molecular mechanisms involved in the in vivo crosstalk between macrophages and other microenvironmental cell types, such as endothelial and skeletal stem/progenitor cells.
Collapse
Affiliation(s)
- Bianca Braga Frade
- Laboratory of Stem Cells and Bone Regeneration, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;,Postgraduation Program in Biological Sciences-Biophysics, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rhayra Braga Dias
- Laboratory of Stem Cells and Bone Regeneration, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;,Postgraduation Program in Morphological Sciences, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Sara Gemini Piperni
- Laboratory of Biotechnology, Bioengineering and Nanostructured Biomaterials, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Danielle Cabral Bonfim
- Laboratory of Stem Cells and Bone Regeneration, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| |
Collapse
|
29
|
Roberts JL, Golloshi M, Harding DB, Conduah M, Liu G, Drissi H. Bifidobacterium longum supplementation improves age-related delays in fracture repair. Aging Cell 2023; 22:e13786. [PMID: 36704918 PMCID: PMC10086533 DOI: 10.1111/acel.13786] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/23/2022] [Accepted: 01/09/2023] [Indexed: 01/28/2023] Open
Abstract
Age-related delays in bone repair remains an important clinical issue that can prolong pain and suffering. It is now well established that inflammation increases with aging and that this exacerbated inflammatory response can influence skeletal regeneration. Recently, simple dietary supplementation with beneficial probiotic bacteria has been shown to influence fracture repair in young mice. However, the contribution of the gut microbiota to age-related impairments in fracture healing remains unknown. Here, we sought to determine whether supplementation with a single beneficial probiotic species, Bifidobacterium longum (B. longum), would promote fracture repair in aged (18-month-old) female mice. We found that B. longum supplementation accelerated bony callus formation which improved mechanical properties of the fractured limb. We attribute these pro-regenerative effects of B. longum to preservation of intestinal barrier, dampened systemic inflammation, and maintenance of the microbiota community structure. Moreover, B. longum attenuated many of the fracture-induced systemic pathologies. Our study provides evidence that targeting the gut microbiota using simple dietary approaches can improve fracture healing outcomes and minimize systemic pathologies in the context of aging.
Collapse
Affiliation(s)
- Joseph L Roberts
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta VA Health Care System, Decatur, Georgia, USA
| | - Mateo Golloshi
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta VA Health Care System, Decatur, Georgia, USA
| | - Derek B Harding
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta VA Health Care System, Decatur, Georgia, USA
| | - Madison Conduah
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta VA Health Care System, Decatur, Georgia, USA
| | - Guanglu Liu
- Atlanta VA Health Care System, Decatur, Georgia, USA
| | - Hicham Drissi
- Department of Orthopaedics, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta VA Health Care System, Decatur, Georgia, USA
| |
Collapse
|
30
|
Li D, Li X, Zhang J, Tang Z, Tian A. The immunomodulatory effect of IL-4 accelerates bone substitute material-mediated osteogenesis in aged rats via NLRP3 inflammasome inhibition. Front Immunol 2023; 14:1121549. [PMID: 37153554 PMCID: PMC10157059 DOI: 10.3389/fimmu.2023.1121549] [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: 12/11/2022] [Accepted: 04/10/2023] [Indexed: 05/09/2023] Open
Abstract
Background Bone defect repair by implanting bone substitute materials has been a common clinical treatment. With the understanding of substance-immune system interactions and increasing evidence indicating that the post-implantation immune response determines the fate of bone substitute materials, active modulation of host macrophage polarization is considered a promising strategy. However, whether the same regulatory effects exist when an individual immune system is altered with aging is unclear. Methods In this study, we mechanistically investigated the effect of immunosenescence on the active regulation of macrophage polarization by establishing a cranial bone defect model in young and aged rats implanted with Bio-Oss®. Forty-eight young and 48 aged specific pathogen-free (SPF) male SD rats were randomly divided into two groups. In the experimental group, 20 μL of IL-4 (0.5 μg/mL) was injected locally on the third to seventh postoperative days, while an equal volume of PBS was injected in the control group. Specimens were collected at 1, 2, 6, and 12 weeks postoperatively, and bone regeneration at the defect site was evaluated by micro-CT, histomorphometry, immunohistochemistry, double-labeling immunofluorescence, and RT-qPCR. Results The application of exogenous IL-4 reduced activation of NLRP3 inflammasomes by promoting the polarization of M1 macrophages to M2 macrophages, thus promoting bone regeneration at the site of bone defects in aged rats. However, this effect was gradually weakened after the IL-4 intervention was discontinued. Conclusion Our data confirmed that a strategy to regulate macrophage polarization is also feasible under conditions of immunosenescence, i.e., the local inflammatory microenvironment can be regulated by reducing M1-type macrophages. However, further experiments are needed to determine an exogenous IL-4 intervention that can maintain a more sustained effect.
Collapse
Affiliation(s)
- Duchenhui Li
- Department of Prosthodontics and Implantology, School and Hospital of Stomatology of Guizhou Medical University, Guiyang, Guizhou, China
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology of Guizhou Medical University, Guiyang, China
- Department of Physiology and Pathology, School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
| | - Xiao Li
- Department of Oral and Maxillofacial Surgery, Guiyang Hospital of Stomatology, Guiyang, Guizhou, China
| | - Jie Zhang
- Department of Prosthodontics and Implantology, School and Hospital of Stomatology of Guizhou Medical University, Guiyang, Guizhou, China
| | - Zhenglong Tang
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology of Guizhou Medical University, Guiyang, China
- Department of Physiology and Pathology, School of Basic Medical Sciences, Guizhou Medical University, Guiyang, China
- *Correspondence: Ai Tian, ; Zhenglong Tang,
| | - Ai Tian
- Department of Prosthodontics and Implantology, School and Hospital of Stomatology of Guizhou Medical University, Guiyang, Guizhou, China
- *Correspondence: Ai Tian, ; Zhenglong Tang,
| |
Collapse
|
31
|
Cao AB, McGrady LM, Wang M. Effect of age on femur whole-bone bending strength of mature rat. Clin Biomech (Bristol, Avon) 2023; 101:105828. [PMID: 36455401 DOI: 10.1016/j.clinbiomech.2022.105828] [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: 02/12/2022] [Revised: 11/15/2022] [Accepted: 11/22/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND Skeletally mature rodents are frequently used in studies of bone health and bone healing, some of them requiring longitudinal observations that span a significant portion of the animals' adulthood. However, changes in whole bone mechanics associated with the natural aging of adult rats have not been extensively characterized. METHODS Femurs from skeletally mature Wistar rats in three age groups of 24-week (young adult), 39-week (middle-age), and 54-week (late middle-age) were tested under three-point bending load in the anterior-posterior direction. Mechanical properties and geometric properties of the femurs from the two older groups were compared to the 24-week rats. FINDINGS Significantly greater strength, rigidity, and post-yield deformation were found in the 54-week group when compared to the 24-week group. The oldest group also demonstrated greater leg length, anteroposterior width, and cross-sectional moment of inertia over the youngest group. Of the intrinsic properties, the highest ultimate stress was found in the 39-week and was significantly higher than the 24-week group. The ultimate strain increased with age, and the difference between the youngest and the oldest group was statistically significant. INTERPRETATION The results suggest that femoral bending properties and geometric properties are continually modified from young adult to late-middle-aged animals. Knowing the baseline bone strength and rigidity throughout adulthood of a rodent breed helps guide animal selection in study design.
Collapse
Affiliation(s)
- Andrew B Cao
- Medical College of Wisconsin, Milwaukee, WI 53226-3548, USA.
| | - Linda M McGrady
- Medical College of Wisconsin, Milwaukee, WI 53226-3548, USA; Marquette University, Milwaukee, WI 53226-3548, USA.
| | - Mei Wang
- Medical College of Wisconsin, Milwaukee, WI 53226-3548, USA; Marquette University, Milwaukee, WI 53226-3548, USA.
| |
Collapse
|
32
|
Huang R, Balu AR, Molitoris KH, White JP, Robling AG, Ayturk UM, Baht GS. The role of Meteorin-like in skeletal development and bone fracture healing. J Orthop Res 2022; 40:2510-2521. [PMID: 35076116 PMCID: PMC9309188 DOI: 10.1002/jor.25286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 01/11/2022] [Accepted: 01/23/2022] [Indexed: 02/04/2023]
Abstract
Meteorin-like protein (Metrnl), homologous to the initially identified neurotrophic factor Meteorin, is a secreted, multifunctional protein. Here we used mouse models to investigate Metrnl's role in skeletal development and bone fracture healing. During development Metrnl was expressed in the perichondrium and primary ossification center. In neonates, single cell RNA-seq of diaphyseal bone demonstrated strongest expression of Metrnl transcript by osteoblasts. In vitro, Metrnl was osteoinductive, increasing osteoblast differentiation and mineralization in tissue culture models. In vivo, loss of Metrnl expression resulted in no change in skeletal metrics in utero, at birth, or during postnatal growth. Six-week-old Metrnl-null mice displayed similar body length, body weight, tibial length, femoral length, BV/TV, trabecular number, trabecular thickness, and cortical thickness as littermate controls. In 4-month-old mice, lack of Metrnl expression did not change structural stiffness, ultimate force, or energy to fracture of femora under 3-point-bending. Last, we investigated the role of Metrnl in bone fracture healing. Metrnl expression increased in response to tibial injury, however, loss of Metrnl expression did not affect the amount of bone deposited within the healing tissue nor did it change the structural parameters of healing tissue. This work identifies Metrnl as a dispensable molecule for skeletal development. However, the osteoinductive capabilities of Metrnl may be utilized to modulate osteoblast differentiation in cell-based orthopedic therapies.
Collapse
Affiliation(s)
- Rong Huang
- Department of MedicineDuke Molecular Physiology InstituteDurhamNorth CarolinaUSA,Department of Orthopaedic SurgeryDuke UniversityDurhamNorth CarolinaUSA
| | - Abhinav R. Balu
- Department of MedicineDuke Molecular Physiology InstituteDurhamNorth CarolinaUSA,Department of Orthopaedic SurgeryDuke UniversityDurhamNorth CarolinaUSA
| | - Kristin H. Molitoris
- Department of MedicineDuke Molecular Physiology InstituteDurhamNorth CarolinaUSA,Department of Orthopaedic SurgeryDuke UniversityDurhamNorth CarolinaUSA
| | - James P. White
- Department of MedicineDuke Molecular Physiology InstituteDurhamNorth CarolinaUSA
| | - Alexander G. Robling
- Department of Anatomy and Cell BiologyIndiana University School of MedicineIndianapolisIndianaUSA
| | - Ugur M. Ayturk
- Department of ResearchHospital for Special SurgeryNew York CityNew YorkUSA,Department of Orthopaedic SurgeryWeill Cornell MedicineNew York CityNew YorkUSA
| | - Gurpreet S. Baht
- Department of MedicineDuke Molecular Physiology InstituteDurhamNorth CarolinaUSA,Department of Orthopaedic SurgeryDuke UniversityDurhamNorth CarolinaUSA,Department of PathologyDuke UniversityDurhamNorth CarolinaUSA
| |
Collapse
|
33
|
Liu J, Dan R, Zhou X, Xiang J, Wang J, Liu J. Immune senescence and periodontitis: From mechanism to therapy. J Leukoc Biol 2022; 112:1025-1040. [PMID: 36218054 DOI: 10.1002/jlb.3mr0822-645rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 08/12/2022] [Accepted: 08/23/2022] [Indexed: 12/24/2022] Open
Abstract
Periodontitis is one of the most prevalent infectious inflammatory diseases, characterized by irreversible destruction of the supporting tissues of teeth, which is correlated with a greater risk of multiple systemic diseases, thus regarded as a major health concern. Dysregulation between periodontal microbial community and host immunity is considered to be the leading cause of periodontitis. Comprehensive studies have unveiled the double-edged role of immune response in the development of periodontitis. Immune senescence, which is described as age-related alterations in immune system, including a diminished immune response to endogenous and exogenous stimuli, a decline in the efficiency of immune protection, and even failure in immunity build-up after vaccination, leads to the increased susceptibility to infection. Recently, the intimate relationship between immune senescence and periodontitis has come into focus, especially in the aging population. In this review, both periodontal immunity and immune senescence will be fully introduced, especially their roles in the pathology and progression of periodontitis. Furthermore, novel immunotherapies targeting immune senescence are presented to provide potential targets for research and clinical intervention in the future.
Collapse
Affiliation(s)
- Jiaqi Liu
- Laboratory for Aging Research, State Key Laboratory of Biotherapy & National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases; Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Ruichen Dan
- Laboratory for Aging Research, State Key Laboratory of Biotherapy & National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases; Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Xueman Zhou
- Laboratory for Aging Research, State Key Laboratory of Biotherapy & National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases; Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Jie Xiang
- Laboratory for Aging Research, State Key Laboratory of Biotherapy & National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases; Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Jun Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases; Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Jin Liu
- Laboratory for Aging Research, State Key Laboratory of Biotherapy & National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| |
Collapse
|
34
|
Tabanez AP, de Campos Soriani Azevedo M, Melchiades JL, Fonseca AC, Francisconi CF, Colavite PM, Biguetti CC, de Oliveira Rodini Pegoraro C, Trombone APF, Garlet GP. FTY720 administration results in a M2 associated immunoregulatory effect that positively influences the outcome of alveolar bone repair outcome in mice. Bone 2022; 163:116506. [PMID: 35902072 DOI: 10.1016/j.bone.2022.116506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/18/2022] [Accepted: 07/20/2022] [Indexed: 11/02/2022]
Abstract
The alveolar bone repair process may be influenced by multiple local and systemic factors, which include immune system cells and mediators. Macrophages allegedly play important roles in the repair process, and the transition of an initial inflammatory M1 profile into a pro-reparative M2 profile theoretically contributes to a favorable repair outcome. In this context, considering immunoregulatory molecules as potential targets for improving bone repair, this study evaluated the role of the immunoregulatory molecule FTY720, previously described to favor the development of the M2 phenotype, in the process of alveolar bone healing in C57Bl/6 (WT) mice. Experimental groups submitted to tooth extraction and maintained under control conditions or treated with FTY720 were evaluated by microtomographic (μCT), histomorphometric, immunohistochemical and molecular analysis to characterize healing and host response features at 0, 1, 3, 7 and 14 days. Our results demonstrated that the FTY720 group presented higher bone tissue density, higher bone tissue volume, greater tissue volume fraction, greater number and thickness of trabeculae and a higher number of osteoblasts and osteoclasts than the control group. Accordingly, the bone markers BMP2, BMP7, ALPL, SOST and RANK mRNA expressions increased in the FTY720 treated group. Furthermore, the levels of FIZZ, ARG2 and IL-10 mRNA increased in the FTY720 group together with the presence of CD206+ cells, suggesting that the boost of bone formation mediated by FTY720 involves an increased polarization and activity of M2 macrophages in healing sites. Thus, our results demonstrate that FTY720 favored the process of alveolar bone repair, probably trough a strengthened M2 response, associated with an increased expression of markers osteogenic differentiation and activity markers. Immunoregulatory strategies based in the modulation of macrophage polarization profile can comprise effective tools to improve the bone repair process.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Cláudia Cristina Biguetti
- School of Dentistry of Bauru, University of São Paulo (FOB/USP), Bauru, SP, Brazil; Department of Bioengineering, The University of Texas at Dallas, Richardson, TX, United States of America
| | | | | | | |
Collapse
|
35
|
Chow SKH, Wong CHW, Cui C, Li MMC, Wong RMY, Cheung WH. Modulating macrophage polarization for the enhancement of fracture healing, a systematic review. J Orthop Translat 2022; 36:83-90. [PMID: 35979176 PMCID: PMC9364046 DOI: 10.1016/j.jot.2022.05.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/04/2022] [Accepted: 05/06/2022] [Indexed: 12/04/2022] Open
Abstract
Background All fracture repairs start with the innate immune system with the inflammatory response known as the inflammatory stage guided and driven by the secretion of chemokine by the ruptured tissue, followed by the sequential recruitment of neutrophils, monocytes and macrophages. These innate immune cells would infiltrate the fracture site and secrete inflammatory cytokines to stimulate recruitment of more immune cells to arrive at the fracture site coordinating subsequent stages of the repair process. In which, subsidence of pro-inflammatory M1 macrophage and transformation to anti-inflammatory M2 macrophages promotes osteogenesis that marks the start of the anabolic endochondral stage. Methods Literature search was performed on Pubmed, Embase, and Web of Science databases (last accessed 15th April 2021) using “macrophage AND fracture”. Review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline. Results Eleven pre-clinical animal studies out of 429 articles were included in this systematic review according to our inclusion and exclusion criteria. All of which investigated interventions targeting to modulate the acute inflammatory response and macrophage polarization as evident by various markers in association with fracture healing outcomes. Conclusion This systematic review summarizes attempts to modulate the innate immune response with focuses on promoting macrophage polarization from M1 to M2 phenotype targeting the enhancement of fracture injury repair. Methods used to achieve the goal may include applications of damage-associated molecular pattern (DAMP), pathogen-associated molecular pattern (PAMP) or mechanical stimulation that hold high translational potentials for clinical application in the near future.
Collapse
Affiliation(s)
- Simon Kwoon-Ho Chow
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Carissa Hing-Wai Wong
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Can Cui
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Michelle Meng-Chen Li
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ronald Man Yeung Wong
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Wing-Hoi Cheung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| |
Collapse
|
36
|
Lu YN, Wang L, Zhang YZ. The promising roles of macrophages in geriatric hip fracture. Front Cell Dev Biol 2022; 10:962990. [PMID: 36092716 PMCID: PMC9458961 DOI: 10.3389/fcell.2022.962990] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 07/26/2022] [Indexed: 11/13/2022] Open
Abstract
As aging becomes a global burden, the incidence of hip fracture (HF), which is the most common fracture in the elderly population and can be fatal, is rapidly increasing, and its extremely high fatality rate places significant medical and financial burdens on patients. Fractures trigger a complex set of immune responses, and recent studies have shown that with aging, the immune system shows decreased activity or malfunctions in a process known as immune senescence, leading to disease and death. These phenomena are the reasons why elderly individuals typically exhibit chronically low levels of inflammation and increased rates of infection and chronic disease. Macrophages, which are key players in the inflammatory response, are critical in initiating the inflammatory response, clearing pathogens, controlling the innate and adaptive immune responses and repairing damaged tissues. Tissue-resident macrophages (TRMs) are widely present in tissues and perform immune sentinel and homeostatic functions. TRMs are combinations of macrophages with different functions and phenotypes that can be directly influenced by neighboring cells and the microenvironment. They form a critical component of the first line of defense in all tissues of the body. Immune system disorders caused by aging could affect the biology of macrophages and thus the cascaded immune response after fracture in various ways. In this review, we outline recent studies and discuss the potential link between monocytes and macrophages and their potential roles in HF in elderly individuals.
Collapse
Affiliation(s)
- Yi-ning Lu
- Department of Orthopedic Research Center, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Ling Wang
- Department of Orthopedic Research Center, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- Department of Orthopedic Oncology, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- *Correspondence: Ying-ze Zhang, ; Ling Wang,
| | - Ying-ze Zhang
- Department of Orthopedic Research Center, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- Department of Orthopedic Surgery, The Third Hospital of Hebei Medical University, Shijiazhuang, China
- *Correspondence: Ying-ze Zhang, ; Ling Wang,
| |
Collapse
|
37
|
Dube CT, Ong YHB, Wemyss K, Krishnan S, Tan TJ, Janela B, Grainger JR, Ronshaugen M, Mace KA, Lim CY. Age-Related Alterations in Macrophage Distribution and Function Are Associated With Delayed Cutaneous Wound Healing. Front Immunol 2022; 13:943159. [PMID: 35874681 PMCID: PMC9304927 DOI: 10.3389/fimmu.2022.943159] [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: 05/13/2022] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
Ageing-related delays and dysregulated inflammation in wound healing are well-documented in both human and animal models. However, cellular and molecular changes underlying this impairment in healing progression are not fully understood. In this study, we characterised ageing-associated changes to macrophages in wounds of young and aged mice and investigated transcriptomic differences that may impact the progression of wound healing. Full-thickness wounds created on the dorsum of C57BL/6J young and aged mice were excised on Days 3 and 7 post-wounding for analysis by immunohistochemistry, flow cytometry, and RNA sequencing. Our data revealed that macrophages were significantly reduced in aged wounds in comparison to young. Functional transcriptomic analyses showed that macrophages from aged wounds exhibited significantly reduced expression of cell cycle, DNA replication, and repair pathway genes. Furthermore, we uncovered an elevated pro-inflammatory gene expression program in the aged macrophages correlated with poor inflammation resolution and excessive tissue damage observed in aged wounds. Altogether, our work provides insights into how poorly healing aged wounds are phenotypically defined by the presence of macrophages with reduced proliferative capacity and an exacerbated inflammatory response, both of which are pathways that can be targeted to improve healing in the elderly.
Collapse
Affiliation(s)
- Christabel Thembela Dube
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- Epithelial Epigenetics and Development Laboratory, ASTAR Skin Research Labs, Singapore, Singapore
| | - Yasmin Hui Binn Ong
- Epithelial Epigenetics and Development Laboratory, ASTAR Skin Research Labs, Singapore, Singapore
| | - Kelly Wemyss
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Siddharth Krishnan
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Tiak Ju Tan
- Epithelial Epigenetics and Development Laboratory, ASTAR Skin Research Labs, Singapore, Singapore
| | - Baptiste Janela
- Skin Immunology Laboratory, ASTAR Skin Research Labs, Singapore, Singapore
- Skin Immuno-Monitoring Platform , Skin Research Institute of Singapore, Singapore, Singapore
| | - John R. Grainger
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom
| | - Matthew Ronshaugen
- School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Kimberly A. Mace
- School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
- *Correspondence: Chin Yan Lim, ; Kimberly A. Mace,
| | - Chin Yan Lim
- Epithelial Epigenetics and Development Laboratory, ASTAR Skin Research Labs, Singapore, Singapore
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- *Correspondence: Chin Yan Lim, ; Kimberly A. Mace,
| |
Collapse
|
38
|
Su N, Villicana C, Yang F. Immunomodulatory strategies for bone regeneration: A review from the perspective of disease types. Biomaterials 2022; 286:121604. [PMID: 35667249 PMCID: PMC9881498 DOI: 10.1016/j.biomaterials.2022.121604] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/19/2022] [Accepted: 05/24/2022] [Indexed: 02/08/2023]
Abstract
Tissue engineering strategies for treating bone loss to date have largely focused on targeting stem cells or vascularization. Immune cells, including macrophages and T cells, can also indirectly enhance bone healing via cytokine secretion to interact with other bone niche cells. Bone niche cues and local immune environment vary depending on anatomical location, size of defects and disease types. As such, it is critical to evaluate the role of the immune system in the context of specific bone niche and different disease types. This review focuses on immunomodulation research for bone applications using biomaterials and cell-based strategies, with a unique perspective from different disease types. We first reviewed applications for prolonging orthopaedic implant lifetime and enhancing fracture healing, two clinical challenges where immunomodulatory strategies were initially developed for orthopedic applications. We then reviewed recent research progress in harnessing immunomodulatory strategies for regenerating critical-sized, long bone or cranial bone defects, and treating osteolytic bone diseases. Remaining gaps in knowledge, future directions and opportunities were also discussed.
Collapse
Affiliation(s)
- Ni Su
- Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Cassandra Villicana
- Department of Bioengineering, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Fan Yang
- Department of Orthopaedic Surgery, Stanford University School of Medicine, Stanford, CA, 94305, USA.,Department of Bioengineering, Stanford University School of Medicine, Stanford, CA, 94305, USA.,: Corresponding Author Fan Yang, Ph D, Department of Orthopaedic Surgery and Bioengineering, Stanford University School of Medicine, 240 Pasteur Dr, Palo Alto, CA 94304, Biomedical Innovation Building, 1st floor, Room 1200, , Phone: (650) 646-8558
| |
Collapse
|
39
|
Tsukagoshi Y, Matsushita Y. Bone regeneration: A message from clinical medicine and basic science. Clin Anat 2022; 35:808-819. [PMID: 35654609 DOI: 10.1002/ca.23917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Accepted: 05/27/2022] [Indexed: 11/08/2022]
Abstract
Population aging is a global phenomenon and with it, the number of bone fractures increases due to higher incidences of osteoporosis. Bone fractures in the elderly increase the risk of bedridden status and mortality. Therefore, the control of osteoporosis and bone fracture is important for healthy life expectancy, and the fundamental understanding of its pathogenesis and its application in treatment is of great social significance. To solve these clinical problems, it is necessary to integrate clinical medicine and basic research. Bone regeneration after a fracture is an essential function of the living body. The prevailing view is that a small number of resident skeletal stem cells are solely responsible for regenerative capacity. Although these cells have long been considered to be in the bone marrow, it has been shown that they are also present in the growth plate and periosteum. More recently, distinct types of cells in the bone marrow, including bone marrow stromal cells, osteoblast progenitor cells, and osteoblasts, have been shown to participate in bone regeneration. Interestingly, the cellular plasticity of differentiated cells, rather than active recruitment of resident stem cell populations, may largely account for regeneration of bone tissues; terminally differentiated cells de-differentiate into a stem cell-like state, and then re-differentiate into regenerating bone. In this review, we discuss the clinical risk and preventive therapy of bone fractures and the current concept of bone regeneration in basic mechanical insights, which may prove useful to both clinicians and researchers.
Collapse
Affiliation(s)
- Yuta Tsukagoshi
- Department of Orthopedic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Yuki Matsushita
- Department of Cell Biology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| |
Collapse
|
40
|
Lee KA, Flores RR, Jang IH, Saathoff A, Robbins PD. Immune Senescence, Immunosenescence and Aging. FRONTIERS IN AGING 2022; 3:900028. [PMID: 35821850 PMCID: PMC9261375 DOI: 10.3389/fragi.2022.900028] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 05/06/2022] [Indexed: 01/15/2023]
Abstract
With aging, there is increased dysfunction of both innate and adaptive immune responses, which contributes to impaired immune responses to pathogens and greater mortality and morbidity. This age-related immune dysfunction is defined in general as immunosenescence and includes an increase in the number of memory T cells, loss of ability to respond to antigen and a lingering level of low-grade inflammation. However, certain features of immunosenescence are similar to cellular senescence, which is defined as the irreversible loss of proliferation in response to damage and stress. Importantly, senescence cells can develop an inflammatory senescence-associated secretory phenotype (SASP), that also drives non-autonomous cellular senescence and immune dysfunction. Interestingly, viral infection can increase the extent of immune senescence both directly and indirectly, leading to increased immune dysfunction and inflammation, especially in the elderly. This review focuses on age-related immune dysfunction, cellular senescence and the impaired immune response to pathogens.
Collapse
|
41
|
Clark D, Radaic A, Kapila Y. Cellular Mechanisms of Inflammaging and Periodontal Disease. FRONTIERS IN DENTAL MEDICINE 2022; 3:844865. [PMID: 36540609 PMCID: PMC9762858 DOI: 10.3389/fdmed.2022.844865] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2023] Open
Abstract
Increased age is associated with an increased prevalence of chronic inflammatory diseases and conditions. The term inflammaging has been used to describe the age-related changes to the immune response that results in a chronic and elevated inflammatory state that contributes, in part, to the increased prevalence of disease in older adults. Periodontal disease is a chronic inflammatory condition that affects the periodontium and increases in prevalence with age. To better understand the mechanisms that drive inflammaging, a broad body of research has focused on the pathological age-related changes to key cellular regulators of the immune response. This review will focus on our current understanding of how certain immune cells (neutrophils, macrophages, T cells) change with age and how such changes contribute to inflammaging and more specifically to periodontal disease.
Collapse
Affiliation(s)
- Daniel Clark
- Department of Periodontics and Preventive Dentistry, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, United States
| | - Allan Radaic
- Orofacial Sciences Department, School of Dentistry, University of California, San Francisco (UCSF), San Francisco, CA, United States
| | - Yvonne Kapila
- Orofacial Sciences Department, School of Dentistry, University of California, San Francisco (UCSF), San Francisco, CA, United States
| |
Collapse
|
42
|
Liu J, Zhang J, Lin X, Boyce BF, Zhang H, Xing L. Age-associated callus senescent cells produce TGF-β1 that inhibits fracture healing in aged mice. J Clin Invest 2022; 132:148073. [PMID: 35426372 PMCID: PMC9012290 DOI: 10.1172/jci148073] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 02/16/2022] [Indexed: 01/10/2023] Open
Abstract
Cellular senescence plays an important role in human diseases, including osteoporosis and osteoarthritis. Senescent cells (SCs) produce the senescence-associated secretory phenotype to affect the function of neighboring cells and SCs themselves. Delayed fracture healing is common in the elderly and is accompanied by reduced mesenchymal progenitor cells (MPCs). However, the contribution of cellular senescence to fracture healing in the aged has not to our knowledge been studied. Here, we used C57BL/6J 4-month-old young and 20-month-old aged mice and demonstrated a rapid increase in SCs in the fracture callus of aged mice. The senolytic drugs dasatinib plus quercetin enhanced fracture healing in aged mice. Aged callus SCs inhibited the growth and proliferation of callus-derived MPCs (CaMPCs) and expressed high levels of TGF-β1. TGF-β–neutralizing Ab prevented the inhibitory effects of aged callus SCs on CaMPCs and promoted fracture healing in aged mice, which was associated with increased CaMPCs and proliferating cells. Thus, fracture triggered a significant cellular senescence in the callus cells of aged mice, which inhibited MPCs by expressing TGF-β1. Short-term administration of dasatinib plus quercetin depleted callus SCs and accelerated fracture healing in aged mice. Senolytic drugs represent a promising therapy, while TGF-β1 signaling is a molecular mechanism for fractures in the elderly via SCs.
Collapse
Affiliation(s)
- Jiatong Liu
- Department of Pathology and Laboratory Medicine, Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
| | - Jun Zhang
- Plastic Surgery Center, Department of Orthopedics, Zhejiang Provincial People’s Hospital, Hangzhou, Zhejiang, China
- Suzhou Institute of Systems Medicine, Suzhou, China
| | - Xi Lin
- Department of Pathology and Laboratory Medicine, Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
| | - Brendan F. Boyce
- Department of Pathology and Laboratory Medicine, Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
| | - Hengwei Zhang
- Department of Pathology and Laboratory Medicine, Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
| | - Lianping Xing
- Department of Pathology and Laboratory Medicine, Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, New York, USA
| |
Collapse
|
43
|
Lopez EM, Leclerc K, Ramsukh M, Parente PE, Patel K, Aranda CJ, Josephson AM, Remark LH, Kirby DJ, Buchalter DB, Hadi T, Morgani SM, Ramkhelawon B, Leucht P. Modulating the systemic and local adaptive immune response after fracture improves bone regeneration during aging. Bone 2022; 157:116324. [PMID: 34998981 PMCID: PMC9016796 DOI: 10.1016/j.bone.2021.116324] [Citation(s) in RCA: 2] [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: 07/29/2021] [Revised: 12/21/2021] [Accepted: 12/28/2021] [Indexed: 01/04/2023]
Abstract
Tissue injury leads to the well-orchestrated mobilization of systemic and local innate and adaptive immune cells. During aging, immune cell recruitment is dysregulated, resulting in an aberrant inflammatory response that is detrimental for successful healing. Here, we precisely define the systemic and local immune cell response after femur fracture in young and aging mice and identify increased toll-like receptor signaling as a potential culprit for the abnormal immune cell recruitment observed in aging animals. Myd88, an upstream regulator of TLR-signaling lies at the core of this aging phenotype, and local treatment of femur fractures with a Myd88 antagonist in middle-aged mice reverses the aging phenotype of impaired fracture healing, thus offering a promising therapeutic target that could overcome the negative impact of aging on bone regeneration.
Collapse
Affiliation(s)
- Emma Muiños Lopez
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Kevin Leclerc
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Malissa Ramsukh
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Paulo El Parente
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Karan Patel
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Carlos J Aranda
- Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America; Jaffe Food Allergy Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States of America
| | - Anna M Josephson
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Lindsey H Remark
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America; Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - David J Kirby
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Daniel B Buchalter
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Tarik Hadi
- Department of Surgery, Division of Endovascular Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Sophie M Morgani
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Bhama Ramkhelawon
- Department of Surgery, Division of Endovascular Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America; Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America
| | - Philipp Leucht
- Department of Orthopaedic Surgery, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America; Department of Cell Biology, NYU Robert I. Grossman School of Medicine, New York, NY, United States of America.
| |
Collapse
|
44
|
Abstract
Despite major research efforts to elucidate mechanisms of non-union formation, failed fracture healing remains a common complication in orthopedic surgery. Adequate vascularization has been recognized as a crucial factor for successful bone regeneration, as newly formed microvessels guarantee the supply of the callus tissue with vital oxygen, nutrients, and growth factors. Accordingly, a vast number of preclinical studies have focused on the development of vascularization strategies to stimulate fracture repair. However, recent evidence suggests that stimulation of blood vessel formation is an oversimplified approach to support bone regeneration. This review discusses the role of vascularization during bone regeneration and delineates a phenomenon, for which we coin the term “the vascularization paradox of non-union-formation”. This view is based on the results of a variety of experimental studies that suggest that the callus tissue of non-unions is indeed densely vascularized and that pro-angiogenic mediators, such as vascular endothelial growth factor, are sufficiently expressed at the facture site. By gaining further insights into the molecular and cellular basis of non-union vascularization, it may be possible to develop more optimized treatment approaches or even prevent the non-union formation in the future.
Collapse
|
45
|
Working ZM, Peterson D, Lawson M, O’Hara K, Coghlan R, Provencher MT, Friess DM, Johnstone B, Miclau T, Bahney CS. Collagen X Longitudinal Fracture Biomarker Suggests Staged Fixation in Tibial Plateau Fractures Delays Rate of Endochondral Repair. J Orthop Trauma 2022; 36:S32-S39. [PMID: 35061649 PMCID: PMC10308601 DOI: 10.1097/bot.0000000000002307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/08/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To use a novel, validated bioassay to monitor serum concentrations of a breakdown product of collagen X in a prospective longitudinal study of patients sustaining isolated tibial plateau fractures. Collagen X is the hallmark extracellular matrix protein present during conversion of soft, cartilaginous callus to bone during endochondral repair. Previous preclinical and clinical studies demonstrated a distinct peak in collagen X biomarker (CXM) bioassay levels after long bone fractures. SETTING Level 1 academic trauma facility. PATIENTS/PARTICIPANTS Thirty-six patients; isolated tibial plateau fractures. INTERVENTION (3) Closed treatment, ex-fix (temporizing/definitive), and open reduction internal fixation. MAIN OUTCOME MEASUREMENTS Collagen X serum biomarker levels (CXM bioassay). RESULTS Twenty-two men and 14 women (average age: 46.3 y; 22.6-73.4, SD 13.3) enrolled (16 unicondylar and 20 bicondylar fractures). Twenty-five patients (72.2%) were treated operatively, including 12 (33.3%) provisionally or definitively treated by ex-fix. No difference was found in peak CXM values between sexes or age. Patients demonstrated peak expression near 1000 pg/mL (average: male-986.5 pg/mL, SD 369; female-953.2 pg/mL, SD 576). There was no difference in peak CXM by treatment protocol, external fixator use, or fracture severity (Schatzker). Patients treated with external fixation (P = 0.05) or staged open reduction internal fixation (P = 0.046) critically demonstrated delayed peaks. CONCLUSIONS Pilot analysis demonstrates a strong CXM peak after fractures commensurate with previous preclinical and clinical studies, which was delayed with staged fixation. This may represent the consequence of delayed construct loading. Further validation requires larger cohorts and long-term follow-up. Collagen X may provide an opportunity to support prospective interventional studies testing novel orthobiologics or fixation techniques. LEVEL OF EVIDENCE Level II, prospective clinical observational study.
Collapse
Affiliation(s)
- Zachary M. Working
- Department of Orthopaedics & Rehabilitation, Oregon Health and Science University, Portland, OR
| | - Danielle Peterson
- Department of Orthopaedics & Rehabilitation, Oregon Health and Science University, Portland, OR
| | - Michelle Lawson
- Department of Orthopaedics & Rehabilitation, Oregon Health and Science University, Portland, OR
| | | | | | | | - Darin M. Friess
- Department of Orthopaedics & Rehabilitation, Oregon Health and Science University, Portland, OR
| | - Brian Johnstone
- Department of Orthopaedics & Rehabilitation, Oregon Health and Science University, Portland, OR
- Portland Shriners Hospital, Portland, OR
| | - Theodore Miclau
- Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, University of California at San Francisco, San Francisco, CA
| | - Chelsea S. Bahney
- Steadman Philippon Research Institute, Vail, CO
- Department of Orthopaedic Surgery, Orthopaedic Trauma Institute, University of California at San Francisco, San Francisco, CA
| |
Collapse
|
46
|
Kigera JW, Gichangi PB, Abdelmalek AK, Ogeng'o JA. Age related effects of selective and non-selective COX-2 inhibitors on bone healing. J Clin Orthop Trauma 2022; 25:101763. [PMID: 35211371 PMCID: PMC8847834 DOI: 10.1016/j.jcot.2022.101763] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/18/2021] [Accepted: 01/08/2022] [Indexed: 01/14/2023] Open
Abstract
INTRODUCTION Fractures are increasing worldwide and with an aging population, are frequent in the elderly. The healing of fractures progresses through various phases including the inflammatory stage. Aging is associated with slower healing and the use of non steroidal anti-inflammatory drugs (NSAIDs) may interrupt bone healing processes. We designed a study to compare the effect of diclofenac and celecoxib on fracture callus histomorphometry in a rat model of different age groups. METHODS Using 5 and 15 month old rats, fractures were induced on the left tibia and the animals allocated to receive one of the drugs. Animals were sacrificed at day 21 and 42 and the fracture callus harvested for processing and histological evaluation. Tissue proportions and histological grades were determined and compared across the groups. RESULTS Across all groups, the histological grade increased with time and animals in the young diclofenac group had the highest grade at day 42 (p = 0.004). The proportion of bone increased in all groups and was highest in the young diclofenac group at day 21 and day 42 (p = 0.003). Post hoc analysis showed that the young celecoxib and old celecoxib groups had the least proportion of bone (p = 0.032 and p = 0.003). The proportion of cartilage reduced in all groups at both time points. CONCLUSION Celecoxib was associated with lower histological grade and lower proportion of bone in older animals. We urge for caution regarding the use of celecoxib in older people for the management of pain associated with fractures. Diclofenac may be a better option in this group.
Collapse
|
47
|
Zhang E, Miramini S, Patel M, Richardson M, Ebeling P, Zhang L. Role of TNF-α in early-stage fracture healing under normal and diabetic conditions. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 213:106536. [PMID: 34823199 DOI: 10.1016/j.cmpb.2021.106536] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 10/14/2021] [Accepted: 11/12/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND AND OBJECTIVE Inflammatory response plays a crucial role in the early stage of fracture healing. Immediately after fracture, the debris and immune cells (e.g., macrophages), recruited into the fracture callus, lead to the secretion of inflammatory cytokines, such as tumor necrosis factor-alpha (TNF-α), which governs the mesenchymal stem cells (MSCs) mediated healing processes. However, it is still unclear how chronic inflammatory diseases (e.g., diabetes) affect the level of TNF-α in fracture callus, ultimately the healing outcomes at the early stage of healing. Therefore, the purpose of this study is to develop a numerical model for investigating TNF-α mediated bone fracture healing. METHODS A mathematical model consisting of a system of partial differential equations that represent the reactive transport of cells and cytokines in the fracture callus is developed in this study. The model is first calibrated by using available experimental data and then implemented to study the effect of TNF-α on the early stage of fracture healing under normal and diabetic conditions. RESULTS There is a significant elevation of TNF-α level in facture callus during the first 24 h post-fracture in normal condition, and its influence in the concentration of MSCs and cell differentiation becomes significant three days post-fracture (e.g., the absence of TNF-α signaling could reduce the concentration of MSCs more than 20% in cortical callus). In addition, the excessive secretion of TNF-α induced by diabetes could decrease the concentration of MSCs at the initial stage of healing, particularly reduce the concentration of MSCs in cortical callus by around 25%. CONCLUSION The model predictions suggested that there should be an optimal concentration of TNF-α in fracture callus, which enhances the early stage of healing, and excessive or insufficient secretion of TNF-α might significantly hinder the healing process.
Collapse
Affiliation(s)
- Enhao Zhang
- Department of Infrastructure Engineering, The University of Melbourne, 700 Swanston St, Parkville, Victoria 3010, Australia
| | - Saeed Miramini
- Department of Infrastructure Engineering, The University of Melbourne, 700 Swanston St, Parkville, Victoria 3010, Australia
| | - Minoo Patel
- Centre for Limb Lengthening and Reconstruction, Epworth Hospital Richmond, Richmond, Victoria, Australia
| | | | - Peter Ebeling
- Department of Medicine, School of Clinical Sciences, Monash University, Monash Medical Centre, Victoria, Australia
| | - Lihai Zhang
- Department of Infrastructure Engineering, The University of Melbourne, 700 Swanston St, Parkville, Victoria 3010, Australia.
| |
Collapse
|
48
|
Sun X, Gao J, Meng X, Lu X, Zhang L, Chen R. Polarized Macrophages in Periodontitis: Characteristics, Function, and Molecular Signaling. Front Immunol 2021; 12:763334. [PMID: 34950140 PMCID: PMC8688840 DOI: 10.3389/fimmu.2021.763334] [Citation(s) in RCA: 79] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 11/04/2021] [Indexed: 12/23/2022] Open
Abstract
Periodontitis (PD) is a common chronic infectious disease. The local inflammatory response in the host may cause the destruction of supporting periodontal tissue. Macrophages play a variety of roles in PD, including regulatory and phagocytosis. Moreover, under the induction of different factors, macrophages polarize and form different functional phenotypes. Among them, M1-type macrophages with proinflammatory functions and M2-type macrophages with anti-inflammatory functions are the most representative, and both of them can regulate the tendency of the immune system to exert proinflammatory or anti-inflammatory functions. M1 and M2 macrophages are involved in the destructive and reparative stages of PD. Due to the complex microenvironment of PD, the dynamic development of PD, and various local mediators, increasing attention has been given to the study of macrophage polarization in PD. This review summarizes the role of macrophage polarization in the development of PD and its research progress.
Collapse
Affiliation(s)
- Xiaoyu Sun
- *Correspondence: Lei Zhang, ; Xiaoyu Sun,
| | | | | | | | - Lei Zhang
- Key Laboratory of Oral Diseases Research of Anhui Province, Department of Periodontology, Stomatologic Hospital & College, Anhui Medical University, Hefei, China
| | | |
Collapse
|
49
|
Ehnert S, Relja B, Schmidt-Bleek K, Fischer V, Ignatius A, Linnemann C, Rinderknecht H, Huber-Lang M, Kalbitz M, Histing T, Nussler AK. Effects of immune cells on mesenchymal stem cells during fracture healing. World J Stem Cells 2021; 13:1667-1695. [PMID: 34909117 PMCID: PMC8641016 DOI: 10.4252/wjsc.v13.i11.1667] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/31/2021] [Accepted: 09/03/2021] [Indexed: 02/06/2023] Open
Abstract
In vertebrates, bone is considered an osteoimmune system which encompasses functions of a locomotive organ, a mineral reservoir, a hormonal organ, a stem cell pool and a cradle for immune cells. This osteoimmune system is based on cooperatively acting bone and immune cells, cohabitating within the bone marrow. They are highly interdependent, a fact that is confounded by shared progenitors, mediators, and signaling pathways. Successful fracture healing requires the participation of all the precursors, immune and bone cells found in the osteoimmune system. Recent evidence demonstrated that changes of the immune cell composition and function may negatively influence bone healing. In this review, first the interplay between different immune cell types and osteoprogenitor cells will be elaborated more closely. The separate paragraphs focus on the specific cell types, starting with the cells of the innate immune response followed by cells of the adaptive immune response, and the complement system as mediator between them. Finally, a brief overview on the challenges of preclinical testing of immune-based therapeutic strategies to support fracture healing will be given.
Collapse
Affiliation(s)
- Sabrina Ehnert
- Siegfried Weller Research Institute at the BG Trauma Center Tübingen, Department of Trauma and Reconstructive Surgery, University of Tübingen, Tübingen 72076, Germany
| | - Borna Relja
- Experimental Radiology, Department of Radiology and Nuclear Medicine, Otto-von-Guericke University, Magdeburg 39120, Germany
| | - Katharina Schmidt-Bleek
- Julius Wolff Institute and Berlin Institute of Health Center of Regenerative Therapies, Charité - University Medicine Berlin, Berlin 13353, Germany
| | - Verena Fischer
- Institute of Orthopedic Research and Biomechanics, Ulm University Medical Center, Ulm 89091, Germany
| | - Anita Ignatius
- Institute of Orthopedic Research and Biomechanics, Ulm University Medical Center, Ulm 89091, Germany
| | - Caren Linnemann
- Siegfried Weller Research Institute at the BG Trauma Center Tübingen, Department of Trauma and Reconstructive Surgery, University of Tübingen, Tübingen 72076, Germany
| | - Helen Rinderknecht
- Siegfried Weller Research Institute at the BG Trauma Center Tübingen, Department of Trauma and Reconstructive Surgery, University of Tübingen, Tübingen 72076, Germany
| | - Markus Huber-Lang
- Institute for Clinical and Experimental Trauma-Immunology (ITI), University Hospital Ulm, Ulm 89091, Germany
| | - Miriam Kalbitz
- Department of Trauma and Orthopedic Surgery, University Hospital Erlangen Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen 91054, Germany
| | - Tina Histing
- Siegfried Weller Research Institute at the BG Trauma Center Tübingen, Department of Trauma and Reconstructive Surgery, University of Tübingen, Tübingen 72076, Germany
| | - Andreas K Nussler
- Siegfried Weller Research Institute at the BG Trauma Center Tübingen, Department of Trauma and Reconstructive Surgery, University of Tübingen, Tübingen 72076, Germany
| |
Collapse
|
50
|
The influence of M-CSF on fracture healing in a mouse model. Sci Rep 2021; 11:22326. [PMID: 34785696 PMCID: PMC8595369 DOI: 10.1038/s41598-021-01673-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 10/25/2021] [Indexed: 12/15/2022] Open
Abstract
Macrophage colony-stimulating factor 1 (M-CSF) is known to play a critical role during fracture repair e.g. by recruiting stem cells to the fracture site and impacting hard callus formation by stimulating osteoclastogenesis. The aim of this experiment was to study the impact of systemic M-CSF application and its effect on bony healing in a mouse model of femoral osteotomy. Doing so, we studied 61 wild type (wt) mice (18-week-old female C57BL/6) which were divided into three groups: (1) femoral osteotomy, (2) femoral osteotomy + stabilization with external fixator and (3) femoral osteotomy + stabilization with external fixator + systemic M-CSF application. Further, 12 op/op mice underwent femoral osteotomy and served as proof of concept. After being sacrificed at 28 days bony bridging was evaluated ex vivo with µCT, histological and biomechanical testing. Systemic M-CSF application impacted osteoclasts numbers, which were almost as low as found in op/op mice. Regarding callus size, the application of M-CSF in wt mice resulted in significantly larger calluses compared to wt mice without systemic M-CSF treatment. We further observed an anabolic effect of M-CSF application resulting in increased trabecular thickness compared to wt animals without additional M-CSF application. Systemic M-CSF application did not alter biomechanical properties in WT mice. The impact of M-CSF application in a mouse model of femoral osteotomy was oppositional to what we were expecting. While M-CSF application had a distinct anabolic effect on callus size as well as trabecular thickness, this on bottom line did not improve biomechanical properties. We hypothesize that in addition to the well-recognized negative effects of M-CSF on osteoclast numbers this seems to further downstream cause a lack of feedback on osteoblasts. Ultimately, continuous M-CSF application in the absence of co-stimulatory signals (e.g. RANKL) might overstimulate the hematopoietic linage in favor of tissue macrophages instead of osteoclasts.
Collapse
|