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Liu Y, Wu Y, Hu X, Sun Y, Zeng G, Wang Q, Liu S, Sun M. The role of vitamin D receptor in predentin mineralization and dental repair after injury. Cell Tissue Res 2024; 396:343-351. [PMID: 38492000 DOI: 10.1007/s00441-024-03886-7] [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: 04/04/2023] [Accepted: 03/06/2024] [Indexed: 03/18/2024]
Abstract
Dentin is a permeable and complex tubular composite formed by the mineralization of predentin that mineralization and repair are of considerable clinical interest during dentin homeostasis. The role of Vdr, a receptor of vitamin D, in dentin homeostasis remains unexplored. The aim of the present study was to assess the impact of Vdr on predentin mineralization and dental repair. Vdr-knockout (Vdr-/-) mice models were constructed; histology and immunohistochemistry analyses were conducted for both WT and Vdr-/- mice. The finding revealed a thicker predentin in Vdr-/- mice, characterized by higher expression of biglycan and decorin. A dental injury model was employed to observe tertiary dentin formation in Vdr-/- mice with dental injuries. Results showed that tertiary dentin was harder to form in Vdr-/- mice with dental injury. Over time, heightened pulp invasion was observed at the injury site in Vdr-/- mice. Expression of biglycan and decorin was reduced in the predentin at the injury site in the Vdr-/- mice by immunohistochemistry. Taken together, our results imply that Vdr plays a regulatory role in predentin mineralization and tertiary dentin formation during dentin homeostasis.
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Affiliation(s)
- Yudong Liu
- Department of Histology and Embryology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Yinlin Wu
- Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Xiaodong Hu
- Department of Histology and Embryology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Yu Sun
- Department of Biochemistry and Molecular Biology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Guojin Zeng
- Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Qinglong Wang
- Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China
| | - Shanshan Liu
- Anhui Key Laboratory of Infection and Immunity, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China.
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical College, 287 Chuang Huai Road, Bengbu, 233004, China.
| | - Meiqun Sun
- Department of Histology and Embryology, Bengbu Medical College, 2600 Dong Hai Avenue, Bengbu, 233030, China.
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Shu Y, Huang J, Gao M, Gan S, Zhu S, Xu S, Yang Z, Liao Y, Lu W. Small Interfering RNA Targeting DMP1 Protects Mice Against Blood-Brain Barrier Disruption and Brain Injury After Intracerebral Hemorrhage. J Stroke Cerebrovasc Dis 2021; 30:105760. [PMID: 33845422 DOI: 10.1016/j.jstrokecerebrovasdis.2021.105760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 03/05/2021] [Accepted: 03/09/2021] [Indexed: 01/30/2023] Open
Abstract
Dentin matrix protein 1 (DMP1) is an extracellular matrix phosphoprotein that is known to facilitate mineralization of collagen in bone and promote osteoblast/odontoblast differentiation. Blood-brain barrier (BBB) disruption is the major pathogenesis in secondary brain injury after intracerebral hemorrhage (ICH). This study aimed to investigate the expression pattern of DMP1 in the mouse brain and explore the role of DMP1 in BBB disruption and brain injury in a mouse model of ICH. Mice were subjected to autologous blood injection-induced ICH. Immunofluorescence staining, western blot analysis, neurobehavioral tests, brain water content measurements, Evans blue permeability assay, and transmission electron microscopy were performed. Small interfering RNA targeting DMP1 (DMP1 siRNA) was administered at 72 h prior to ICH. Results showed that DMP1 is expressed extensively in the mouse brain, and is upregulated in the ICH model. Administration of DMP1 siRNA effectively ameliorated BBB disruption, attenuated brain edema, and improved neurological function after ICH. Moreover, the expression of zonula occludens-1 (ZO-1) and occludin were upregulated, and matrix metalloproteinase-9 (MMP-9) was downregulated in the ICH model. DMP1 siRNA administration reversed the expression of ZO-1, occludin, and MMP-9. These results demonstrated that DMP1 upregulation plays an essential role in inducing BBB disruption and brain injury after ICH. The inhibition of DMP1 could be a potential therapeutic strategy for ICH treatment.
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Affiliation(s)
- Yue Shu
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Juan Huang
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Meng Gao
- Department of Clinical Laboratory, 521 Hospital of Ordnance Industry, Xi'an 7100065, China.
| | - Shengwei Gan
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Shujuan Zhu
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Shiye Xu
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Zhengyu Yang
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Yuhui Liao
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
| | - Weitian Lu
- Department of Anatomy, Basic Medical College, Chongqing Medical University, Chongqing 400016, China; Institute of Neuroscience, Chongqing Medical University, Chongqing 400016, China.
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Lin S, Cao L, Wang Q, Du J, Jiao D, Duan S, Wu J, Gan Q, Jiang X. Tailored biomimetic hydrogel based on a photopolymerised DMP1/MCF/gelatin hybrid system for calvarial bone regeneration. J Mater Chem B 2018; 6:414-427. [PMID: 32254521 DOI: 10.1039/c7tb02130e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Searching for effective osteoinduction factors with higher specificity and biosafety for the preparation of biomimetic materials, which mimic the natural bone extracellular matrix (ECM), seems to be an optimum strategy for achieving ideal bone regeneration.
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Affiliation(s)
- Shuxian Lin
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
| | - Lingyan Cao
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
| | - Qian Wang
- Department of Oral and Maxillofacial Surgery
- Stomatological Hospital of Chongqing Medical University
- Chongqing 402160
- China
| | - Jiahui Du
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
| | - Delong Jiao
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
| | - Shengzhong Duan
- Laboratory of Oral Microbiota and Systemic Diseases
- Ninth People's Hospital
- School
of Stomatology
- Shanghai 200011
- China
| | - Jiannan Wu
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
| | - Qi Gan
- The State Key Laboratory of Bioreactor Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Xinquan Jiang
- Department of Prosthodontics
- Ninth People's Hospital affiliated to Shanghai Jiao Tong University
- School of Medicine
- Shanghai 200011
- China
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Zhang Q, Lin S, Liu Y, Yuan B, Harris SE, Feng JQ. Dmp1 Null Mice Develop a Unique Osteoarthritis-like Phenotype. Int J Biol Sci 2016; 12:1203-1212. [PMID: 27766035 PMCID: PMC5069442 DOI: 10.7150/ijbs.15833] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 08/04/2016] [Indexed: 12/21/2022] Open
Abstract
Patients with hypophosphatemia rickets (including DMP1 mutations) develop severe osteoarthritis (OA), although the mechanism is largely unknown. In this study, we first identified the expression of DMP1 in hypertrophic chondrocytes using immunohistochemistry (IHC) and X-gal analysis of Dmp1-knockout-lacZ-knockin heterozygous mice. Next, we characterized the OA-like phenotype in Dmp1 null mice from 7-week-old to one-year-old using multiple techniques, including X-ray, micro-CT, H&E staining, Goldner staining, scanning electronic microscopy, IHC assays, etc. We found a classical OA-like phenotype in Dmp1 null mice such as articular cartilage degradation, osteophyte formation, and subchondral osteosclerosis. These Dmp1 null mice also developed unique pathological changes, including a biphasic change in their articular cartilage from the initial expansion of hypertrophic chondrocytes at the age of 1-month to a quick diminished articular cartilage layer at the age of 3-months. Further, these null mice displayed severe enlarged knees and poorly formed bone with an expanded osteoid area. To address whether DMP1 plays a direct role in the articular cartilage, we deleted Dmp1 specifically in hypertrophic chondrocytes by crossing the Dmp1-loxP mice with Col X Cre mice. Interestingly, these conditional knockout mice didn't display notable defects in either the articular cartilage or the growth plate. Because of the hypophosphatemia remained in the entire life span of the Dmp1 null mice, we also investigated whether a high phosphate diet would improve the OA-like phenotype. A 8-week treatment of a high phosphate diet significantly rescued the OA-like defect in Dmp1 null mice, supporting the critical role of phosphate homeostasis in maintaining the healthy joint morphology and function. Taken together, this study demonstrates a unique OA-like phenotype in Dmp1 null mice, but a lack of the direct impact of DMP1 on chondrogenesis. Instead, the regulation of phosphate homeostasis by DMP1 via the axis of “FGF23-renal phosphorus reabsorption” is vital for maintaining a healthy joint.
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Affiliation(s)
- Qi Zhang
- Department of Endondontics, School & Hospital of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, China;; Department of Biomedical Sciences, Texas A&M College of Dentistry, Dallas, TX, USA
| | - Shuxian Lin
- Department of Biomedical Sciences, Texas A&M College of Dentistry, Dallas, TX, USA;; Department of Prosthodontics, Ninth People's Hospital affiliated with Shanghai Jiao Tong University, School of Medicine, Shanghai, China
| | - Ying Liu
- Department of Biomedical Sciences, Texas A&M College of Dentistry, Dallas, TX, USA
| | - Baozhi Yuan
- School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Steph E Harris
- Department of Periodontics, UT Health Science Center, San Antonio, TX, USA
| | - Jian Q Feng
- Department of Biomedical Sciences, Texas A&M College of Dentistry, Dallas, TX, USA
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Liang T, Meng T, Wang S, Qin C, Lu Y. The LPV Motif Is Essential for the Efficient Export of Secretory DMP1 From the Endoplasmic Reticulum. J Cell Physiol 2015; 231:1468-75. [PMID: 26595451 DOI: 10.1002/jcp.25265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 11/19/2015] [Indexed: 11/07/2022]
Abstract
Dentin matrix protein 1 (DMP1) is found abundantly in the extracellular matrices of bone and dentin. Secretory DMP1 begins with a tripeptide of leucine-proline-valine (LPV) after the endoplasmic reticulum (ER)-entry signal peptide is cleaved. The goal of this study was to determine the role of the LPV motif in the secretion of DMP1. A series of DNA constructs was generated to express various forms of DMP1 with or without the LPV motif. These constructs were transfected into a preosteoblast cell line, the MC3T3-E1 cells, and the subcellular localization and secretion of various forms of DMP1 were examined by immunofluorescent staining and Western-blotting analyses. Immunofluorescent staining showed that the LPV-containing DMP1 variants were primarily localized in the Golgi complex, whereas the LPV-lacking DMP1 variants were found abundantly within the ER. Western-blotting analyses demonstrated that the LPV-containing DMP1 variants were rapidly secreted from the transfected cells, as they did not accumulate within the cells, and the amounts increased in the conditioned media over time. In contrast, the LPV-lacking DMP1 variants were predominantly retained within the cells, and only small amounts were secreted out of the cells over time. These results suggest that the LPV motif is essential for the efficient export of secretory DMP1 from the ER to the Golgi complex.
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Affiliation(s)
- Tian Liang
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Tian Meng
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Suzhen Wang
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Chunlin Qin
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Yongbo Lu
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
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Maginot M, Lin S, Liu Y, Yuan B, Feng JQ, Aswath PB. The in vivo role of DMP-1 and serum phosphate on bone mineral composition. Bone 2015; 81:602-613. [PMID: 26303287 DOI: 10.1016/j.bone.2015.08.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 08/16/2015] [Accepted: 08/19/2015] [Indexed: 01/07/2023]
Abstract
Human DMP1 mutations or Dmp1-null (KO) mice display hypophosphatemia rickets, suggesting a causative role of low phosphate (P) in development of osteomalacia. To address the direct contribution of P to the in vivo bone mineralization we analyzed the properties of femurs obtained from Dmp1 null mice and wild type (WT) mice under a normal or high phosphorous (HiP) diet using combined assays, including histological examination, micro computed tomography (μCT), X-ray absorption near edge structure (XANES) spectroscopy and Raman spectroscopy. Histology and XANES indicate that WT mice have phosphate coordinated with Ca in the form of hydroxyapatite and tricalcium phosphate, while the KO mice have poorly coordinated soluble phosphates in their structure in both the normal and HiP diets. Raman spectroscopy and XANES indicate a higher carbonate/phosphate ratio and a low mineral/matrix ratio in the osteoid clusters in the KO femurs, which was only partially improved by HiP diets. Thus, we conclude that the hypophosphatemia induced osteomalacia phenotype in Dmp1 KO mice is contributed by at least two factors: the low Pi level and the DMP1 local function in mineralization.
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Affiliation(s)
- Megen Maginot
- Materials Science and Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States
| | - Shuxian Lin
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas TX 75246, United States
| | - Ying Liu
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas TX 75246, United States
| | - Baozhi Yuan
- School of Medicine and Public Health, Univ. Wisconsin, Madison, WI 53715, United States
| | - Jian Q Feng
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas TX 75246, United States
| | - Pranesh B Aswath
- Materials Science and Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States.
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Liu C, Niu Y, Zhou X, Xu X, Yang Y, Zhang Y, Zheng L. Cell cycle control, DNA damage repair, and apoptosis-related pathways control pre-ameloblasts differentiation during tooth development. BMC Genomics 2015; 16:592. [PMID: 26265206 PMCID: PMC4534026 DOI: 10.1186/s12864-015-1783-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 07/16/2015] [Indexed: 02/05/2023] Open
Abstract
Background Ameloblast differentiation is the most critical stepwise process in amelogenesis, and it is controlled by precise molecular events. To better understand the mechanism controlling pre-ameloblasts (PABs) differentiation into secretory ameloblasts (SABs), a more precise identification of molecules and signaling networks will elucidate the mechanisms governing enamel formation and lay a foundation for enamel regeneration. Results We analyzed transcriptional profiles of human PABs and SABs. From a total of 28,869 analyzed transcripts, we identified 923 differentially expressed genes (DEGs) with p < 0.05 and Fold-change > 2. Among the DEGs, 647 genes showed elevated expression in PABs compared to SABs. Notably, 38 DEGs displayed greater than eight-fold changes. Comparative analysis revealed that highly expressed genes in PABs were involved in cell cycle control, DNA damage repair and apoptosis, while highly expressed genes in SABs were related to cell adhesion and extracellular matrix. Moreover, coexpression network analysis uncovered two highly conserved sub-networks contributing to differentiation, containing transcription regulators (RUNX2, ETV1 and ETV5), solute carrier family members (SLC15A1 and SLC7A11), enamel matrix protein (MMP20), and a polymodal excitatory ion channel (TRPA1). Conclusions By combining comparative analysis and coexpression networks, this study provides novel biomarkers and research targets for ameloblast differentiation and the potential for their application in enamel regeneration. Electronic supplementary material The online version of this article (doi:10.1186/s12864-015-1783-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Chengcheng Liu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
| | - Yulong Niu
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, PR China.
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
| | - Xin Xu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
| | - Yi Yang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, PR China.
| | - Yan Zhang
- Department of Orofacial Sciences, University of California, San Francisco, CA, 94143, USA.
| | - Liwei Zheng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, PR China.
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