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Yang D, Jeong Y, Ortinau L, Solidum J, Park D. Mx1 -labeled pulp progenitor cells are main contributors to postnatal odontoblasts and pulp cells in murine molars. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.21.586156. [PMID: 38585950 PMCID: PMC10996506 DOI: 10.1101/2024.03.21.586156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Regeneration of dentin and odontoblasts from dental pulp stem cells (DPSCs) is essential for permanent tooth maintenance. However, the in vivo identity and role of endogenous DPSCs in reparative dentinogenesis are elusive. Here, using pulp single-cell analysis before and after molar eruption, we revealed that endogenous DPSCs are enriched in Cxcl12- GFP + coronal papilla-like cells with Mx1- Cre labeling. These Mx1 + Cxcl12- GFP + cells are long-term repopulating cells that contribute to the majority of pulp cells and new odontoblasts after eruption. Upon molar injury, Mx1 + DPSCs localize into the injury site and differentiate into new odontoblasts, forming scleraxis -GFP + and osteocalcin -GFP + dentinal tubules and reparative dentin. Single-cell and FACS analysis showed that Mx1 + Cxcl12- GFP + DPSCs are the most primitive cells with stem cell marker expression and odontoblast differentiation. Taken together, our findings demonstrate that Mx1 labels postnatal DSPCs, which are the main source of pulp cells and new odontoblasts with reparative dentinogenesis in vivo .
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Yang D, Ortinau L, Jeong Y, Park D. Advances and challenges in intravital imaging of craniofacial and dental progenitor cells. Genesis 2022; 60:e23498. [PMID: 35980285 PMCID: PMC10015615 DOI: 10.1002/dvg.23498] [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: 03/30/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 11/11/2022]
Abstract
Craniofacial and appendicular bone homeostasis is dynamically regulated by a balance between bone formation and resorption by osteoblasts and osteoclasts, respectively. Despite the developments in multiple imaging techniques in bone biology, there are still technical challenges and limitations in the investigation of spatial/anatomical location of rare stem/progenitor cells and their molecular regulation in tooth and craniofacial bones of living animals. Recent advances in live animal imaging techniques for the craniofacial and dental apparatus can provide new insights in real time into bone stem/progenitor cell dynamics and function in vivo. Here, we review the current inventions and applications of the noninvasive intravital imaging technique and its practical uses and limitations in the analysis of stem/progenitor cells in craniofacial and dental apparatus in vivo. Furthermore, we also explore the potential applications of intravital microscopy in the dental field.
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Affiliation(s)
- Dongwook Yang
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Laura Ortinau
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Youngjae Jeong
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA
| | - Dongsu Park
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA.,Center for Skeletal Biology, Baylor College of Medicine, Houston, Texas, USA.,Department of Pathology & Immunology, Baylor College of Medicine, Houston, Texas, USA
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Rindone AN, Liu X, Farhat S, Perdomo-Pantoja A, Witham TF, Coutu DL, Wan M, Grayson WL. Quantitative 3D imaging of the cranial microvascular environment at single-cell resolution. Nat Commun 2021; 12:6219. [PMID: 34711819 PMCID: PMC8553857 DOI: 10.1038/s41467-021-26455-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 10/05/2021] [Indexed: 11/09/2022] Open
Abstract
Vascularization is critical for skull development, maintenance, and healing. Yet, there remains a significant knowledge gap in the relationship of blood vessels to cranial skeletal progenitors during these processes. Here, we introduce a quantitative 3D imaging platform to enable the visualization and analysis of high-resolution data sets (>100 GB) throughout the entire murine calvarium. Using this technique, we provide single-cell resolution 3D maps of vessel phenotypes and skeletal progenitors in the frontoparietal cranial bones. Through these high-resolution data sets, we demonstrate that CD31hiEmcnhi vessels are spatially correlated with both Osterix+ and Gli1+ skeletal progenitors during postnatal growth, healing, and stimulated remodeling, and are concentrated at transcortical canals and osteogenic fronts. Interestingly, we find that this relationship is weakened in mice with a conditional knockout of PDGF-BB in TRAP+ osteoclasts, suggesting a potential role for osteoclasts in maintaining the native cranial microvascular environment. Our findings provide a foundational framework for understanding how blood vessels and skeletal progenitors spatially interact in cranial bone, and will enable more targeted studies into the mechanisms of skull disease pathologies and treatments. Additionally, our technique can be readily adapted to study numerous cell types and investigate other elusive phenomena in cranial bone biology.
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Affiliation(s)
- Alexandra N Rindone
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Xiaonan Liu
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Division of Orthopaedics and Traumatology, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Stephanie Farhat
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada
- Division of Orthopaedic Surgery, The Ottawa Hospital, Ottawa, ON, Canada
| | | | - Timothy F Witham
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Daniel L Coutu
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada
- Division of Orthopaedic Surgery, The Ottawa Hospital, Ottawa, ON, Canada
| | - Mei Wan
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Warren L Grayson
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, USA.
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD, USA.
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA.
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Abstract
The Cre-LoxP technology permits gene ablation in specific cell lineages, at chosen differentiation stages of this lineage and in an inducible manner. It has allowed tremendous advances in our understanding of skeleton biology and related pathophysiological mechanisms, through the generation of loss/gain of function or cell tracing experiments based on the creation of an expanding toolbox of transgenic mice expressing the Cre recombinase in skeletal stem cells, chondrocytes, osteoblasts, or osteoclasts. In this chapter, we provide an overview of the different Cre-LoxP systems and Cre mouse lines used in the bone field, we discuss their advantages, limitations, and we outline best practices to interpret results obtained from the use of Cre mice.
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Affiliation(s)
- Florent Elefteriou
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA.
- Department of Orthopedic Surgery, Baylor College of Medicine, Houston, TX, USA.
| | - Greig Couasnay
- Department of Orthopedic Surgery, Baylor College of Medicine, Houston, TX, USA
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Ortinau LC, Wang H, Lei K, Deveza L, Jeong Y, Hara Y, Grafe I, Rosenfeld SB, Lee D, Lee B, Scadden DT, Park D. Identification of Functionally Distinct Mx1+αSMA+ Periosteal Skeletal Stem Cells. Cell Stem Cell 2020; 25:784-796.e5. [PMID: 31809737 DOI: 10.1016/j.stem.2019.11.003] [Citation(s) in RCA: 125] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 09/11/2019] [Accepted: 11/11/2019] [Indexed: 12/21/2022]
Abstract
The periosteum is critical for bone maintenance and healing. However, the in vivo identity and specific regulatory mechanisms of adult periosteum-resident skeletal stem cells are unknown. Here, we report animal models that selectively and durably label postnatal Mx1+αSMA+ periosteal stem cells (P-SSCs) and establish that P-SSCs are a long-term repopulating, functionally distinct SSC subset responsible for lifelong generation of periosteal osteoblasts. P-SSCs rapidly migrate toward an injury site, supply osteoblasts and chondrocytes, and recover new periosteum. Notably, P-SSCs specifically express CCL5 receptors, CCR3 and CCR5. Real-time intravital imaging revealed that the treatment with CCL5 induces P-SSC migration in vivo and bone healing, while CCL5/CCR5 deletion, CCR5 inhibition, or local P-SSC ablation reduces osteoblast number and delays bone healing. Human periosteal cells express CCR5 and undergo CCL5-mediated migration. Thus, the adult periosteum maintains genetically distinct SSC subsets with a CCL5-dependent migratory mechanism required for bone maintenance and injury repair.
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Affiliation(s)
- Laura C Ortinau
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Center for Skeletal Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Hamilton Wang
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Kevin Lei
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Lorenzo Deveza
- Department of Orthopedic Surgery, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Youngjae Jeong
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Yannis Hara
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Ingo Grafe
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Center for Skeletal Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - Scott B Rosenfeld
- Texas Children's Hospital, 6701 Fannin Street, Houston, TX 77030, USA
| | - Dongjun Lee
- Department of Convergence of Medical Science, Pusan National University School of Medicine, Yangsan 50612, Republic of Korea
| | - Brendan Lee
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Center for Skeletal Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
| | - David T Scadden
- Harvard Stem Cell Institute, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA; Department of Stem Cell and Regenerative Biology, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA
| | - Dongsu Park
- Department of Molecular Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Center for Skeletal Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Department of Pathology and Immunology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
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Khosravi N, Mendes VC, Nirmal G, Majeed S, DaCosta RS, Davies JE. Intravital Imaging for Tracking of Angiogenesis and Cellular Events Around Surgical Bone Implants. Tissue Eng Part C Methods 2018; 24:617-627. [PMID: 30280999 DOI: 10.1089/ten.tec.2018.0252] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
IMPACT STATEMENT These new experimental methods allow us to image, and quantify, angiogenesis and perivascular cell dynamics in the endosseous healing compartment. As such, the method is capable of providing a new perspective on, and unique information regarding, healing that occurs around orthopedic and dental implants.
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Affiliation(s)
- Niloufar Khosravi
- 1 Faculty of Dentistry, University of Toronto , Toronto, Ontario, Canada .,2 Princess Margaret Cancer Institute, University Health Network , Toronto, Ontario, Canada .,3 Institute for Biomaterials and Biomedical Engineering, University of Toronto , Toronto, Ontario, Canada
| | - Vanessa C Mendes
- 1 Faculty of Dentistry, University of Toronto , Toronto, Ontario, Canada
| | - Ghata Nirmal
- 4 Department of Chemical Engineering and Applied Chemistry, University of Toronto , Toronto, Ontario, Canada
| | - Safa Majeed
- 5 Department of Medical Biophysics, University of Toronto , Toronto, Ontario, Canada
| | - Ralph S DaCosta
- 2 Princess Margaret Cancer Institute, University Health Network , Toronto, Ontario, Canada .,5 Department of Medical Biophysics, University of Toronto , Toronto, Ontario, Canada .,6 Techna Institute, University Health Network , Toronto, Ontario, Canada
| | - John E Davies
- 1 Faculty of Dentistry, University of Toronto , Toronto, Ontario, Canada .,3 Institute for Biomaterials and Biomedical Engineering, University of Toronto , Toronto, Ontario, Canada
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Comparative analysis of gene expression identifies distinct molecular signatures of bone marrow- and periosteal-skeletal stem/progenitor cells. PLoS One 2018; 13:e0190909. [PMID: 29342188 PMCID: PMC5771600 DOI: 10.1371/journal.pone.0190909] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 12/21/2017] [Indexed: 12/22/2022] Open
Abstract
Periosteum and bone marrow (BM) both contain skeletal stem/progenitor cells (SSCs) that participate in fracture repair. However, the functional difference and selective regulatory mechanisms of SSCs in different locations are unknown due to the lack of specific markers. Here, we report a comprehensive gene expression analysis of bone marrow SSCs (BM-SSCs), periosteal SSCs (P-SSCs), and more differentiated osteoprogenitors by using reporter mice expressing Interferon-inducible Mx1 and NestinGFP, previously known SSC markers. We first defined that the BM-SSCs can be enriched by the combination of Mx1 and NestinGFP expression, while endogenous P-SSCs can be isolated by positive selection of Mx1, CD105 and CD140a (known SSC markers) combined with the negative selection of CD45, CD31, and osteocalcinGFP (a mature osteoblast marker). Comparative gene expression analysis with FACS-sorted BM-SSCs, P-SSCs, Osterix+ preosteoblasts, CD51+ stroma cells and CD45+ hematopoietic cells as controls revealed that BM-SSCs and P-SSCs have high similarity with few potential differences without statistical significance. We also found that CD51+ cells are highly heterogeneous and have little overlap with SSCs. This was further supported by the microarray cluster analysis, where the two SSC populations clustered together but are separate from the CD51+ cells. However, when comparing SSC population to controls, we found several genes that are uniquely upregulated in endogenous SSCs. Amongst these genes, we found KDR (aka Flk1 or VEGFR2) to be most interesting and discovered that it is highly and selectively expressed in P-SSCs. This finding suggests that endogenous P-SSCs are functionally very similar to BM-SSCs with undetectable significant differences in gene expression but there are distinct molecular signatures in P-SSCs, which can be useful to specify P-SSC subset in vivo.
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Govey PM, Zhang Y, Donahue HJ. Mechanical Loading Attenuates Radiation-Induced Bone Loss in Bone Marrow Transplanted Mice. PLoS One 2016; 11:e0167673. [PMID: 27936104 PMCID: PMC5147933 DOI: 10.1371/journal.pone.0167673] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 11/20/2016] [Indexed: 12/16/2022] Open
Abstract
Exposure of bone to ionizing radiation, as occurs during radiotherapy for some localized malignancies and blood or bone marrow cancers, as well as during space travel, incites dose-dependent bone morbidity and increased fracture risk. Rapid trabecular and endosteal bone loss reflects acutely increased osteoclastic resorption as well as decreased bone formation due to depletion of osteoprogenitors. Because of this dysregulation of bone turnover, bone’s capacity to respond to a mechanical loading stimulus in the aftermath of irradiation is unknown. We employed a mouse model of total body irradiation and bone marrow transplantation simulating treatment of hematologic cancers, hypothesizing that compression loading would attenuate bone loss. Furthermore, we hypothesized that loading would upregulate donor cell presence in loaded tibias due to increased engraftment and proliferation. We lethally irradiated 16 female C57Bl/6J mice at age 16 wks with 10.75 Gy, then IV-injected 20 million GFP(+) total bone marrow cells. That same day, we initiated 3 wks compression loading (1200 cycles 5x/wk, 10 N) in the right tibia of 10 of these mice while 6 mice were irradiated, non-mechanically-loaded controls. As anticipated, before-and-after microCT scans demonstrated loss of trabecular bone (-48.2% Tb.BV/TV) and cortical thickness (-8.3%) at 3 wks following irradiation. However, loaded bones lost 31% less Tb.BV/TV and 8% less cortical thickness (both p<0.001). Loaded bones also had significant increases in trabecular thickness and tissue mineral densities from baseline. Mechanical loading did not affect donor cell engraftment. Importantly, these results demonstrate that both cortical and trabecular bone exposed to high-dose therapeutic radiation remain capable of an anabolic response to mechanical loading. These findings inform our management of bone health in cases of radiation exposure.
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Affiliation(s)
- Peter M. Govey
- Division of Musculoskeletal Sciences, Department of Orthopaedics and Rehabilitation, Penn State College of Medicine, Hershey, PA, United States of America
- Department of Biomedical Engineering, Penn State College of Engineering, University Park, PA, United States of America
| | - Yue Zhang
- Division of Musculoskeletal Sciences, Department of Orthopaedics and Rehabilitation, Penn State College of Medicine, Hershey, PA, United States of America
- Department of Biomedical Engineering, Virginia Commonwealth College of Engineering, Richmond, VA, United States of America
| | - Henry J. Donahue
- Division of Musculoskeletal Sciences, Department of Orthopaedics and Rehabilitation, Penn State College of Medicine, Hershey, PA, United States of America
- Department of Biomedical Engineering, Penn State College of Engineering, University Park, PA, United States of America
- Department of Cellular and Molecular Physiology, Penn State College of Medicine, Hershey, PA, United States of America
- Department of Biomedical Engineering, Virginia Commonwealth College of Engineering, Richmond, VA, United States of America
- * E-mail:
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