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Cao Y, Bolam SM, Boss AL, Murray HC, Munro JT, Poulsen RC, Dalbeth N, Brooks AES, Matthews BG. Characterization of adult human skeletal cells in different tissues reveals a CD90 +CD34 + periosteal stem/progenitor population. Bone 2024; 178:116926. [PMID: 37793499 DOI: 10.1016/j.bone.2023.116926] [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: 08/15/2023] [Revised: 09/27/2023] [Accepted: 10/01/2023] [Indexed: 10/06/2023]
Abstract
The periosteum plays a crucial role in bone healing and is an important source of skeletal stem and progenitor cells. Recent studies in mice indicate that diverse populations of skeletal progenitors contribute to growth, homeostasis and healing. Information about the in vivo identity and diversity of skeletal stem and progenitor cells in different compartments of the adult human skeleton is limited. In this study, we compared non-hematopoietic populations in matched tissues from the femoral head and neck of 21 human participants using spectral flow cytometry of freshly isolated cells. High-dimensional clustering analysis indicated significant differences in marker distribution between periosteum, articular cartilage, endosteum and bone marrow populations, and identified populations that were highly enriched or unique to specific tissues. Periosteum-enriched markers included CD90 and CD34. Articular cartilage, which has very poor regenerative potential, showed enrichment of multiple markers, including the PDPN+CD73+CD164+CD146- population previously reported to represent human skeletal stem cells. We further characterized periosteal populations by combining CD90 with other strongly expressed markers. CD90+CD34+ cells sorted directly from periosteum showed significant colony-forming unit fibroblasts (CFU-F) enrichment, rapid expansion, and consistent multi-lineage differentiation of clonal populations in vitro. In situ, CD90+CD34+ cells include a perivascular population in the outer layer of the periosteum and non-perivascular cells closer to the bone surface. CD90+ cells are also highly enriched for CFU-F in bone marrow and endosteum, but not articular cartilage. In conclusion, our study indicates considerable diversity in the non-hematopoietic cell populations in different tissue compartments within the adult human skeleton, and suggests that periosteal progenitor cells reside within the CD90+CD34+ population.
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Affiliation(s)
- Ye Cao
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| | - Scott M Bolam
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - Anna L Boss
- Department of Obstetrics and Gynaecology, University of Auckland, Auckland, New Zealand
| | - Helen C Murray
- Department of Anatomy and Medical Imaging, University of Auckland, Auckland, New Zealand
| | - Jacob T Munro
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - Raewyn C Poulsen
- Department of Pharmacology, University of Auckland, Auckland, New Zealand
| | - Nicola Dalbeth
- Department of Medicine, University of Auckland, Auckland, New Zealand
| | - Anna E S Brooks
- School of Biological Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, Auckland, New Zealand
| | - Brya G Matthews
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand.
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Chen R, Dong H, Raval D, Maridas D, Baroi S, Chen K, Hu D, Berry SR, Baron R, Greenblatt MB, Gori F. Sfrp4 is required to maintain Ctsk-lineage periosteal stem cell niche function. Proc Natl Acad Sci U S A 2023; 120:e2312677120. [PMID: 37931101 PMCID: PMC10655581 DOI: 10.1073/pnas.2312677120] [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: 07/28/2023] [Accepted: 10/06/2023] [Indexed: 11/08/2023] Open
Abstract
We have previously reported that the cortical bone thinning seen in mice lacking the Wnt signaling antagonist Sfrp4 is due in part to impaired periosteal apposition. The periosteum contains cells which function as a reservoir of stem cells and contribute to cortical bone expansion, homeostasis, and repair. However, the local or paracrine factors that govern stem cells within the periosteal niche remain elusive. Cathepsin K (Ctsk), together with additional stem cell surface markers, marks a subset of periosteal stem cells (PSCs) which possess self-renewal ability and inducible multipotency. Sfrp4 is expressed in periosteal Ctsk-lineage cells, and Sfrp4 global deletion decreases the pool of PSCs, impairs their clonal multipotency for differentiation into osteoblasts and chondrocytes and formation of bone organoids. Bulk RNA sequencing analysis of Ctsk-lineage PSCs demonstrated that Sfrp4 deletion down-regulates signaling pathways associated with skeletal development, positive regulation of bone mineralization, and wound healing. Supporting these findings, Sfrp4 deletion hampers the periosteal response to bone injury and impairs Ctsk-lineage periosteal cell recruitment. Ctsk-lineage PSCs express the PTH receptor and PTH treatment increases the % of PSCs, a response not seen in the absence of Sfrp4. Importantly, in the absence of Sfrp4, PTH-dependent increase in cortical thickness and periosteal bone formation is markedly impaired. Thus, this study provides insights into the regulation of a specific population of periosteal cells by a secreted local factor, and shows a central role for Sfrp4 in the regulation of Ctsk-lineage periosteal stem cell differentiation and function.
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Affiliation(s)
- Ruiying Chen
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - Han Dong
- Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute and Harvard University Medical School, Boston, MA02115
| | - Dhairya Raval
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - David Maridas
- Department of Developmental Biology, Harvard Medical School and Harvard School of Dental Medicine, Boston, MA02115
| | - Sudipta Baroi
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - Kun Chen
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - Dorothy Hu
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - Shawn R. Berry
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
| | - Roland Baron
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
- Harvard Medical School, Department of Medicine, Endocrine Unit, Massachusetts General Hospital, Boston, MA02114
| | - Matthew B. Greenblatt
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY10065
- Research Division, Hospital for Special Surgery, New York, NY10021
| | - Francesca Gori
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA02115
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Boregowda SV, Haga CL, Supper VM, Booker CN, Phinney DG. Novel role for alpha-2-macroglobulin (A2M) as a disease modifying protein in senile osteoporosis. Front Cell Dev Biol 2023; 11:1294438. [PMID: 37965574 PMCID: PMC10642388 DOI: 10.3389/fcell.2023.1294438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 10/17/2023] [Indexed: 11/16/2023] Open
Abstract
Introduction: In the rapidly aging U.S. population, age-induced bone loss (senile osteoporosis) represents a major public health concern that is associated with a significant increased risk for low trauma fragility fractures, which are debilitating to patients, cause significant morbidity and mortality, and are costly to treat and manage. While various treatments exist to slow bone loss in osteoporosis patients, these suffer from poor tolerability and label restrictions that limit their overall effectiveness. Over the past decade, skeletal stem/progenitor cells (SSPCs), which are the main precursor of osteoblasts and adipocytes in adult bone marrow (BM), have emerged as important players in osteoporosis. Methods: Age-induced skeletal pathology was quantified in elderly (24-month-old) vs. mature (3-month-old) mice by micro-CT and changes in SSPC abundance in the BM of these mice was quantified by fluorescence-activated cell sorting (FACS). SSPCs from elderly vs. mature mice were also analyzed by RNA-Seq to identify differentially expressed genes (DEGs), and gain and loss-of-function studies were performed in human BM-derived mesenchymal stromal cells (BM-MSCs) to assess A2M function. Results: Elderly mice were shown to exhibit significant age-induced skeletal pathology, which correlated with a significant increase in SSPC abundance in BM. RNA-seq analysis identified alpha-2-macroglobulin (A2M), a pan-protease inhibitor that also binds inflammatory cytokines, as one of the most downregulated transcripts in SSPCs isolated from the BM of elderly vs. mature mice, and silencing of A2M expression in human BM-MSCs induced their proliferation and skewed their lineage bifurcation toward adipogenesis at the expense of osteogenesis thereby recapitulating critical aspects of age-induced stem cell dysfunction. Conclusion: These findings identify A2M as a novel disease modifying protein in osteoporosis, downregulation of which in bone marrow promotes SSPC dysfunction and imbalances in skeletal homeostasis.
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Affiliation(s)
| | | | | | | | - Donald G. Phinney
- Department of Molecular Medicine, The Herbert Wertheim UF Scripps Institute for Biomedical Innovation and Technology, Jupiter, FL, United States
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Cao Y, Kalajzic I, Matthews BG. CD51 labels periosteal injury-responsive osteoprogenitors. Front Physiol 2023; 14:1231352. [PMID: 37731543 PMCID: PMC10507171 DOI: 10.3389/fphys.2023.1231352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 08/22/2023] [Indexed: 09/22/2023] Open
Abstract
The periosteum is a critical source of skeletal stem and progenitor cells (SSPCs) that form callus tissue in response to injury. There is yet to be a consensus on how to identify SSPCs in the adult periosteum. The aim of this study was to understand how potential murine periosteal SSPC populations behave in vivo and in response to injury. We evaluated the in vivo differentiation potential of Sca1-CD51+ and Sca1+CD51+ cells following transplantation. In vitro, the Sca1+CD51+ population appears to be more primitive multipotent cells, but after transplantation, Sca1-CD51+ cells showed superior engraftment, expansion, and differentiation into chondrocytes and osteoblasts. Despite representing a clear population with flow cytometry, we identified very few Sca1+CD51+ cells histologically. Using a periosteal scratch injury model, we successfully mimicked the endochondral-like healing process seen in unstable fractures, including the expansion and osteochondral differentiation of αSMA+ cells following injury. CD51+ cells were present in the cambium layer of resting periosteum and expanded following injury. Sca1+CD51- cells were mainly localized in the outer periosteal layer. We found that injury increased colony-forming unit fibroblast (CFU-F) formation in the periosteum and led to rapid expansion of CD90+ cells. Several other populations, including Sca1-CD51+ and CD34+ cells, were expanded by day 7. Mice with enhanced fracture healing due to elevated Notch signaling mediated by NICD1 overexpression showed significant expansion of CD51+ and CD34hi cells in the early stages of healing, suggesting these populations contribute to more rapid healing. In conclusion, we demonstrate that periosteal injury leads to the expansion of various SSPC populations, but further studies are required to confirm their lineage hierarchy in the adult skeletal system. Our data indicate that CD51+ skeletal progenitor cells are injury-responsive and show good engraftment and differentiation potential upon transplantation.
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Affiliation(s)
- Ye Cao
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
| | - Ivo Kalajzic
- Center for Regenerative Medicine and Skeletal Development, School of Dental Medicine, UConn Health, Farmington, CT, United States
| | - Brya G. Matthews
- Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand
- Center for Regenerative Medicine and Skeletal Development, School of Dental Medicine, UConn Health, Farmington, CT, United States
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Dai H, Zhang H, Qiu Z, Shi Q. Periosteum-derived skeletal stem cells encapsulated in platelet-rich plasma enhance the repair of bone defect. Tissue Cell 2023; 83:102144. [PMID: 37354707 DOI: 10.1016/j.tice.2023.102144] [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: 03/27/2023] [Revised: 06/09/2023] [Accepted: 06/14/2023] [Indexed: 06/26/2023]
Abstract
BACKGROUND Spontaneous restoration of large bone defects remains a challenge under infections, tumors, and crushing conditions. Current stem cell-based therapies for treating bone defects need improvement, because the used stem cells are isolated by a traditional protocol, which is based on their properties of in-vitro plastic adherence and fibroblastic colony formation. The stem cells isolated by the traditional protocol belong to a multicellular type mixture, individual cells vary in proliferative and osteogenic potential. Thus, developing a protocol capable of isolating stem cell subset with higher purity is required and urgent. AIM This study aimed to sort a subpopulation of stem cells from periosteum using flow cytometry (named as FC-PSCs), and evaluate the proliferative and osteogenic capacity of FC-PSCs in-vitro, and then establish a new stem cell-based therapies for treating bone defects by delivering the FC-PSCs within platelet-rich plasma (PRP). METHODS Mouse periosteum was used to sort FC-PSCs using flow cytometry with CD45-TER119-TIE2-ITGAV+CD90 + 6C3-CD105- markers, or isolate periosteum-derived stem cells with the traditional protocol (TP-PSCs) as control. After evaluating the FC-PSCs proliferation and osteogenic differentiation in-vitro as well as the promotive efficacy of platelet-rich plasma (PRP) on FC-PSCs proliferation and osteogenic differentiation, the FC-PSCs were delivered into the femoral epiphysis bone defect site of a mouse model by platelet-rich plasma (PRP). At postoperative 14 or 28 days, these mice were euthanized for harvest the femur specimens for micro-CT, histological evaluation. RESULTS In-vitro results determined that the FC-PSCs showed more capacity for proliferation and osteogenic differentiation compared with the TP-PSCs. In addition, in-vitro results showed the promotive efficacy of PRP on FC-PSCs proliferation and osteogenic differentiation. In-vivo results showed that the FC-PSCs delivered by PRP was able to facilitate the repair of bone defects by stimulating new bone formation and remodeling. CONCLUSION FC-PSCs delivered by PRP enhance the repair of bone defects by stimulating new bone formation and remodeling.
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Affiliation(s)
- Haibo Dai
- Department of Orthopedics (Second ward), Xiangtan Central Hospital, Xiangtan 411199, China; Xiangtan Clinical College, Xiangya Medical School, Central South University, Xiangtan 411199, China
| | - Haici Zhang
- Department of Orthopedics (Second ward), Xiangtan Central Hospital, Xiangtan 411199, China; Xiangtan Clinical College, Xiangya Medical School, Central South University, Xiangtan 411199, China
| | - Zhilong Qiu
- Department of Orthopedics (Second ward), Xiangtan Central Hospital, Xiangtan 411199, China; Xiangtan Clinical College, Xiangya Medical School, Central South University, Xiangtan 411199, China
| | - Qiang Shi
- Department of Spine Surgery, The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China, Changsha 410018, China; Clinical College of Changsha Central Hospital, Xiangya Medical College, Central South University, Changsha 410018, China; Department of Sports Medicine, Xiangya Hospital, Central South University, Changsha 410008, China.
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Novak S, Madunic J, Shum L, Vucetic M, Wang X, Tanigawa H, Ghosh M, Sanjay A, Kalajzic I. PDGF inhibits BMP2-induced bone healing. NPJ Regen Med 2023; 8:3. [PMID: 36631491 PMCID: PMC9834334 DOI: 10.1038/s41536-023-00276-5] [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: 04/19/2022] [Accepted: 01/03/2023] [Indexed: 01/13/2023] Open
Abstract
Bone regeneration depends on a pool of bone/cartilage stem/progenitor cells and signaling mechanisms regulating their differentiation. Using in vitro approach, we have shown that PDGF signaling through PDGFRβ inhibits BMP2-induced osteogenesis, and significantly attenuates expression of BMP2 target genes. We evaluated outcomes of treatment with two anabolic agents, PDGF and BMP2 using different bone healing models. Targeted deletion of PDGFRβ in αSMA osteoprogenitors, led to increased callus bone mass, resulting in improved biomechanical properties of fractures. In critical size bone defects BMP2 treatment increased proportion of osteoprogenitors, while the combined treatment of PDGF BB with BMP2 decreased progenitor number at the injury site. BMP2 treatment induced significant bone formation and increased number of osteoblasts, while in contrast combined treatment with PDGF BB decreased osteoblast numbers. This is in vivo study showing that PDGF inhibits BMP2-induced osteogenesis, but inhibiting PDGF signaling early in healing process does not improve BMP2-induced bone healing.
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Affiliation(s)
- Sanja Novak
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
| | - Josip Madunic
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA ,grid.414681.e0000 0004 0452 3941Biochemistry and Organic Analytical Chemistry Unit, Institute for Medical Research and Occupational Health, Zagreb, Croatia
| | - Laura Shum
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
| | - Milan Vucetic
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
| | - Xi Wang
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
| | - Hitoshi Tanigawa
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
| | - Mallika Ghosh
- grid.208078.50000000419370394Center for Vascular Biology, UConn Health, Farmington, CT USA
| | - Archana Sanjay
- grid.208078.50000000419370394Department of Orthopeadic Surgery, UConn Health, Farmington, CT USA
| | - Ivo Kalajzic
- grid.208078.50000000419370394Center for Regenerative Medicine and Skeletal Development, UConn Health, Farmington, CT USA
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Novak S, Kalajzic I. AcanCreER lacks specificity to chondrocytes and targets periosteal progenitors in the fractured callus. Bone 2023; 166:116599. [PMID: 36309308 PMCID: PMC9832919 DOI: 10.1016/j.bone.2022.116599] [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: 09/26/2022] [Revised: 10/19/2022] [Accepted: 10/24/2022] [Indexed: 11/06/2022]
Abstract
Aggrecan (Acan) is a large proteoglycan molecule constituting the extracellular matrix of cartilage, secreted by chondrocytes. To specifically target the chondrocyte lineage, researchers have widely used the AcanCreER mouse model. Evaluation of specificity and efficiency of recombination, requires Cre animals to be crossed with reporter mice. In order to accurately interpret data from Cre models, it is imperative to consider A) the amount of recombination occurring in cells/tissues that are not intended for targeting (i.e., non-specific expression), B) the efficiency of Cre recombination, which can depend on dose and duration of tamoxifen treatment, and C) the activation of CreER without tamoxifen induction, known as "Cre leakage." Using a highly sensitive reporter mouse (Ai9, tdTomato), we performed a comprehensive analysis of the AcanCreER system. Surprisingly, we observed expression in cells within the periosteum. These cells expand at a stage when chondrocytes are not yet present within the forming callus tissue (Acan/Ai9+ cells). In pulse-chase experiments, we confirmed that fibroblastic Acan/Ai9+ cells within the periosteum can directly give rise to osteoblasts. Our results show that Acan/Ai9+ is not specific for the chondrocyte lineage in the fracture callus or with the tibial holes. The expression of AcanCreER in periosteal progenitor cells complicates the interpretation of studies evaluating the transition of chondrocytes to osteoblasts (termed transdifferentiation). Awareness of these issues and the limitations of the system will lead to better data interpretation.
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Affiliation(s)
- Sanja Novak
- Department of Reconstructive Sciences, UConn Health, Farmington, CT, USA
| | - Ivo Kalajzic
- Department of Reconstructive Sciences, UConn Health, Farmington, CT, USA.
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Cebpb Regulates Skeletal Stem Cell Osteogenic Differentiation and Fracture Healing via the WNT/β-Catenin Pathway. Stem Cells Int 2022; 2022:2091615. [PMID: 35898655 PMCID: PMC9314177 DOI: 10.1155/2022/2091615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 06/10/2022] [Accepted: 06/21/2022] [Indexed: 11/17/2022] Open
Abstract
Fracture is the most common traumatic organ injury, and fracture nonunion is a critical clinical challenge. The research on the mechanisms of skeletal stem cell (SSC) differentiation and fracture healing may help develop new treatment strategies and improve the prognosis of patients at high risk of nonunion. Bioinformatic analysis of scRNA-seq data of mouse SSCs and mouse osteoprogenitors was applied to discover major transcription factors for the regulation of SSC differentiation. FACS was used to isolate SSCs prospectively. The expression of Cebpb, osteogenesis-related genes (Runx2, Sp7, and Bglap2), and markers for Notch, Hedgehog, MAPK, BMP2/SMAD, and WNT/β-catenin signaling pathways (Hes1, Gli1, p-Erk1/2, p-Smad1/5/9, and β-catenin) were detected in SSCs with qPCR or western blot, respectively. Alkaline phosphatase assay and alizarin red S staining were used to illustrate the osteogenic differentiation ability of SSCs in vitro. A WNT inhibitor, IWR-1, was further used to explore the mechanism of WNT signaling in the differentiation of SSCs. Micro-CT, mechanical testing, and immunohistochemistry of osteogenic and chondrogenic proteins (Sp7 and Col2α1) were used to demonstrate the capacity of Cebpb knockdown in promoting fracture healing in a monocortical defect model. We found that Cebpb was the crucial transcription factor regulating SSC differentiation. Inhibiting Cebpb in SSCs enhanced the expression of active β-catenin to promote the expression of WNT target genes, thus facilitating the osteogenic differentiation of SSCs. Bone mass, mechanical properties, and osteogenic protein expression were also increased in the Cebpb inhibition group compared to the group without Cebpb inhibition. Collectively, our results proved that Cebpb knockdown promotes SSC osteogenic differentiation and fracture healing via the WNT/β-catenin signaling pathway.
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Chen R, Baron R, Gori F. Sfrp4 and the Biology of Cortical Bone. Curr Osteoporos Rep 2022; 20:153-161. [PMID: 35182301 PMCID: PMC9098678 DOI: 10.1007/s11914-022-00727-w] [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: 12/03/2021] [Indexed: 11/03/2022]
Abstract
PURPOSE OF REVIEW Periosteal apposition and endosteal remodeling regulate cortical bone expansion and thickness, both critical determinants of bone strength. Yet, the cellular characteristics and local or paracrine factors that regulate the periosteum and endosteum remain largely elusive. Here we discuss novel insights in cortical bone growth, expansion, and homeostasis, provided by the study of Secreted Frizzled Receptor Protein 4 (Sfrp4), a decoy receptor for Wnt ligands. RECENT FINDINGS SFRP4 loss-of function mutations cause Pyle disease, a rare skeletal disorder characterized by cortical bone thinning and increased fragility fractures despite increased trabecular bone density. On the endosteal surface, Sfrp4-mediated repression of non-canonical Wnt signaling regulates endosteal resorption. On the periosteum, Sfrp4 identifies as a critical functional mediator of periosteal stem cell/progenitor expansion and differentiation. Analysis of signaling pathways regulating skeletal stem cells/progenitors provides an opportunity to advance our understanding of the mechanisms involved in cortical bone biology.
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Affiliation(s)
- Ruiying Chen
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - Roland Baron
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
- Endocrine Unit, Massachusetts General Hospital and Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Francesca Gori
- Division of Bone and Mineral Research, Department of Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA.
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Shen F, Shi Y. Recent Advances in Single-Cell View of Mesenchymal Stem Cell in Osteogenesis. Front Cell Dev Biol 2022; 9:809918. [PMID: 35071243 PMCID: PMC8766509 DOI: 10.3389/fcell.2021.809918] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/10/2021] [Indexed: 02/05/2023] Open
Abstract
Osteoblasts continuously replenished by osteoblast progenitor cells form the basis of bone development, maintenance, and regeneration. Mesenchymal stem cells (MSCs) from various tissues can differentiate into the progenitor cell of osteogenic lineage and serve as the main source of osteoblasts. They also respond flexibly to regenerative and anabolic signals emitted by the surrounding microenvironment, thereby maintaining bone homeostasis and participating in bone remodeling. However, MSCs exhibit heterogeneity at multiple levels including different tissue sources and subpopulations which exhibit diversified gene expression and differentiation capacity, and surface markers used to predict cell differentiation potential remain to be further elucidated. The rapid advancement of lineage tracing methods and single-cell technology has made substantial progress in the characterization of osteogenic stem/progenitor cell populations in MSCs. Here, we reviewed the research progress of scRNA-seq technology in the identification of osteogenic markers and differentiation pathways, MSC-related new insights drawn from single-cell technology combined with experimental technology, and recent findings regarding the interaction between stem cell fate and niche in homeostasis and pathological process.
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Affiliation(s)
- Fangyuan Shen
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yu Shi
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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11
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Hu W, Liang JW, Liao S, Zhao ZD, Wang YX, Mao XF, Hao SW, Wang YF, Zhu H, Guo B. Melatonin attenuates radiation-induced cortical bone-derived stem cells injury and enhances bone repair in postradiation femoral defect model. Mil Med Res 2021; 8:61. [PMID: 34895335 PMCID: PMC8666036 DOI: 10.1186/s40779-021-00355-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 11/11/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The healing of bone defects can be challenging for clinicians to manage, especially after exposure to ionizing radiation. In this regard, radiation therapy and accidental exposure to gamma (γ)-ray radiation have been shown to inhibit bone formation and increase the risk of fractures. Cortical bone-derived stem cells (CBSCs) are reportedly essential for osteogenic lineages, bone maintenance and repair. This study aimed to investigate the effects of melatonin on postradiation CBSCs and bone defect healing. METHODS CBSCs were extracted from C57BL/6 mice and were identified by flow cytometry. Then CBSCs were subjected to 6 Gy γ-ray radiation followed by treatment with various concentrations of melatonin. The effects of exogenous melatonin on the self-renewal and osteogenic capacity of postradiation CBSCs in vitro were analyzed. The underlying mechanisms involved in genomic stability, apoptosis and oxidative stress-related signaling were further analyzed by Western blotting, flow cytometry and immunofluorescence assays. Moreover, postradiation femoral defect models were established and treated with Matrigel and melatonin. The effects of melatonin on postradiation bone healing in vivo were evaluated by micro-CT and pathological analysis. RESULTS The decrease in radiation-induced self-renewal and osteogenic capacity were partially reversed in postradiation CBSCs treated with melatonin (P < 0.05). Melatonin maintained genomic stability, reduced postradiation CBSC apoptosis and intracellular oxidative stress, and enhanced expression of antioxidant-related enzymes (P < 0.05). Western blotting validated the anti-inflammatory effects of melatonin by downregulating interleukin-6 (IL-6) and tumor necrosis factor alpha (TNF-α) levels via the extracellular regulated kinase (ERK)/nuclear factor erythroid 2-related factor 2 (NRF2)/heme oxygenase-1 (HO-1) signaling pathway. Melatonin was also found to exhibit antioxidant effects via NRF2 signaling. In vivo experiments demonstrated that the newly formed bone in the melatonin plus Matrigel group had higher trabecular bone volume per tissue volume (BV/TV) and bone mineral density values with lower IL-6 and TNF-α levels than in the irradiation and the Matrigel groups (P < 0.05). CONCLUSION This study suggested that melatonin could protect CBSCs against γ-ray radiation and assist in the healing of postradiation bone defects.
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Affiliation(s)
- Wei Hu
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China.,Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China
| | - Jia-Wu Liang
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China.,Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China
| | - Song Liao
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China
| | - Zhi-Dong Zhao
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China
| | - Yu-Xing Wang
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China
| | - Xiao-Fei Mao
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China.,Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China
| | - Si-Wei Hao
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China.,Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China
| | - Yi-Fan Wang
- Medical School of Chinese People's Liberation Army (PLA), Beijing, 100853, China.,Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China
| | - Heng Zhu
- Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, Beijing, 100840, China.
| | - Bin Guo
- Department of Stomatology, the First Medical Centre, Chinese PLA General Hospital, Beijing, 100853, China.
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Matthews BG, Novak S, Sbrana FV, Funnell JL, Cao Y, Buckels EJ, Grcevic D, Kalajzic I. Heterogeneity of murine periosteum progenitors involved in fracture healing. eLife 2021; 10:e58534. [PMID: 33560227 PMCID: PMC7906599 DOI: 10.7554/elife.58534] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 02/08/2021] [Indexed: 12/15/2022] Open
Abstract
The periosteum is the major source of cells involved in fracture healing. We sought to characterize progenitor cells and their contribution to bone fracture healing. The periosteum is highly enriched with progenitor cells, including Sca1+ cells, fibroblast colony-forming units, and label-retaining cells compared to the endosteum and bone marrow. Using lineage tracing, we demonstrate that alpha smooth muscle actin (αSMA) identifies long-term, slow-cycling, self-renewing osteochondroprogenitors in the adult periosteum that are functionally important for bone formation during fracture healing. In addition, Col2.3CreER-labeled osteoblast cells contribute around 10% of osteoblasts but no chondrocytes in fracture calluses. Most periosteal osteochondroprogenitors following fracture can be targeted by αSMACreER. Previously identified skeletal stem cell populations were common in periosteum but contained high proportions of mature osteoblasts. We have demonstrated that the periosteum is highly enriched with skeletal progenitor cells, and there is heterogeneity in the populations of cells that contribute to mature lineages during periosteal fracture healing.
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Affiliation(s)
- Brya G Matthews
- Department of Molecular Medicine and Pathology, University of AucklandAucklandNew Zealand
- Department of Reconstructive Sciences, UConn HealthFarmingtonUnited States
| | - Sanja Novak
- Department of Reconstructive Sciences, UConn HealthFarmingtonUnited States
| | - Francesca V Sbrana
- Department of Reconstructive Sciences, UConn HealthFarmingtonUnited States
| | - Jessica L Funnell
- Department of Reconstructive Sciences, UConn HealthFarmingtonUnited States
| | - Ye Cao
- Department of Molecular Medicine and Pathology, University of AucklandAucklandNew Zealand
| | - Emma J Buckels
- Department of Molecular Medicine and Pathology, University of AucklandAucklandNew Zealand
| | - Danka Grcevic
- Department of Physiology and Immunology, University of ZagrebZagrebCroatia
- Croatian Intitute for Brain Research, University of ZagrebZagrebCroatia
| | - Ivo Kalajzic
- Department of Reconstructive Sciences, UConn HealthFarmingtonUnited States
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