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Iwata E, Sah SK, Chen IP, Reichenberger E. Dental abnormalities in rare genetic bone diseases: Literature review. Clin Anat 2024; 37:304-320. [PMID: 37737444 PMCID: PMC11068025 DOI: 10.1002/ca.24117] [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: 06/21/2023] [Revised: 08/11/2023] [Accepted: 08/26/2023] [Indexed: 09/23/2023]
Abstract
Currently, over 500 rare genetic bone disorders are identified. These diseases are often accompanied by dental abnormalities, which are sometimes the first clue for an early diagnosis. However, not many dentists are sufficiently familiar with phenotypic abnormalities and treatment approaches when they encounter patients with rare diseases. Such patients often need dental treatment but have difficulties in finding a dentist who can treat them appropriately. Herein we focus on major dental phenotypes and summarize their potential causes and mechanisms, if known. We discuss representative diseases, dental treatments, and their effect on the oral health of patients and on oral health-related quality of life. This review can serve as a starting point for dentists to contribute to early diagnosis and further investigate the best treatment options for patients with rare disorders, with the goal of optimizing treatment outcomes.
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Affiliation(s)
- Eiji Iwata
- Department of Oral and Maxillofacial Surgery, Kakogawa Central City Hospital, Kakogawa, Japan
- Department of Oral and Maxillofacial Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Shyam Kishor Sah
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health, Farmington, Connecticut, USA
| | - I-Ping Chen
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health, Farmington, Connecticut, USA
| | - Ernst Reichenberger
- Department of Reconstructive Sciences, School of Dental Medicine, University of Connecticut Health, Farmington, Connecticut, USA
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2
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Andras NL, Mohamed FF, Chu EY, Foster BL. Between a rock and a hard place: Regulation of mineralization in the periodontium. Genesis 2022; 60:e23474. [PMID: 35460154 PMCID: PMC9492628 DOI: 10.1002/dvg.23474] [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: 02/25/2022] [Revised: 04/08/2022] [Accepted: 04/09/2022] [Indexed: 12/30/2022]
Abstract
The periodontium supports and attaches teeth via mineralized and nonmineralized tissues. It consists of two, unique mineralized tissues, cementum and alveolar bone. In between these tissues, lies an unmineralized, fibrous periodontal ligament (PDL), which distributes occlusal forces, nourishes and invests teeth, and harbors progenitor cells for dentoalveolar repair. Many unanswered questions remain regarding periodontal biology. This review will focus on recent research providing insights into one enduring mystery: the precise regulation of the hard-soft tissue borders in the periodontium which define the interfaces of the cementum-PDL-alveolar bone structure. We will focus on advances in understanding the molecular mechanisms that maintain the unmineralized PDL "between a rock and a hard place" by regulating the mineralization of cementum and alveolar bone.
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Affiliation(s)
- Natalie L. Andras
- Biosciences Division, College of DentistryThe Ohio State UniversityColumbusOhioUSA
| | - Fatma F. Mohamed
- Biosciences Division, College of DentistryThe Ohio State UniversityColumbusOhioUSA
| | - Emily Y. Chu
- Division of Operative Dentistry, Department of General Dentistry, School of DentistryUniversity of MarylandBaltimoreMarylandUSA
| | - Brian L. Foster
- Biosciences Division, College of DentistryThe Ohio State UniversityColumbusOhioUSA
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Chen J, Cuevas P, Dworan J, Dawid I, Turkkahraman H, Tran K, Delgado-Calle J, Bellido T, Gorski J, Liu B, Brunski J, Helms J. Wnt/β-catenin Signaling Controls Maxillofacial Hyperostosis. J Dent Res 2022; 101:793-801. [PMID: 35114849 PMCID: PMC10850863 DOI: 10.1177/00220345211067705] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The roles of Wnt/β-catenin signaling in regulating the morphology and microstructure of craniomaxillofacial (CMF) bones was explored using mice carrying a constitutively active form of β-catenin in activating Dmp1-expressing cells (e.g., daβcatOt mice). By postnatal day 24, daβcatOt mice exhibited midfacial truncations coupled with maxillary and mandibular hyperostosis that progressively worsened with age. Mechanistic insights into the basis for the hyperostotic facial phenotype were gained through molecular and cellular analyses, which revealed that constitutively activated β-catenin in Dmp1-expressing cells resulted in an increase in osteoblast number and an increased rate of mineral apposition. An increase in osteoblasts was accompanied by an increase in osteocytes, but they failed to mature. The resulting CMF bone matrix also had an abundance of osteoid, and in locations where compact lamellar bone typically forms, it was replaced by porous, woven bone. The hyperostotic facial phenotype was progressive. These findings identify for the first time a ligand-independent positive feedback loop whereby unrestrained Wnt/β-catenin signaling results in a CMF phenotype of progressive hyperostosis combined with architecturally abnormal, poorly mineralized matrix that is reminiscent of craniotubular disorders in humans.
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Affiliation(s)
- J. Chen
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - P.L. Cuevas
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - J.S. Dworan
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
- Medical University of Vienna, Department of Anatomy, Center for Anatomy and Cell Biology, Vienna, Austria
| | - I. Dawid
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - H. Turkkahraman
- Indiana University School of Dentistry, Department of Orthodontics & Oral Facial Genetics, Indianapolis, IN, USA
| | - K. Tran
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - J. Delgado-Calle
- Department of Physiology & Biophysics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - T. Bellido
- Department of Physiology & Biophysics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - J.P. Gorski
- Department of Oral and Craniofacial Sciences, School of Dentistry, and Center of Excellence in Mineralized Tissue Research, University of Missouri–Kansas City, Kansas City, MO, USA
| | - B. Liu
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - J.B. Brunski
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
| | - J.A. Helms
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
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Nagasaki A, Nagasaki K, Kear BD, Tadesse WD, Thumbigere-Math V, Millán JL, Foster BL, Somerman MJ. Delivery of Alkaline Phosphatase Promotes Periodontal Regeneration in Mice. J Dent Res 2021; 100:993-1001. [PMID: 33840251 DOI: 10.1177/00220345211005677] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Factors regulating the ratio of pyrophosphate (PPi) to phosphate (Pi) modulate biomineralization. Tissue-nonspecific alkaline phosphatase (TNAP) is a key promineralization enzyme that hydrolyzes the potent mineralization inhibitor PPi. The goal of this study was to determine whether TNAP could promote periodontal regeneration in bone sialoprotein knockout mice (Ibsp-/- mice), which are known to have a periodontal disease phenotype. Delivery of TNAP was accomplished either systemically (through a lentiviral construct expressing a mineral-targeted TNAP-D10 protein) or locally (through addition of recombinant human TNAP to a fenestration defect model). Systemic TNAP-D10 delivered by intramuscular injection at 5 d postnatal (dpn) increased circulating alkaline phosphatase (ALP) levels in Ibsp-/- mice by 5-fold at 30 dpn, with levels returning to normal by 60 dpn when tissues were evaluated by micro-computed tomography and histology. Local delivery of recombinant human TNAP to fenestration defects in 5-wk-old wild type (WT) and Ibsp-/- mice did not alter long-term circulating ALP levels, and tissues were evaluated by micro-computed tomography and histology at postoperative day 45. Systemic and local delivery of TNAP significantly increased alveolar bone volume (20% and 37%, respectively) and cementum thickness (3- and 42-fold) in Ibsp-/- mice, with evidence for periodontal ligament attachment and bone/cementum marker localization. Local delivery significantly increased regenerated cementum and bone in WT mice. Addition of 100-μg/mL bovine intestinal ALP to culture media to increase ALP in vitro increased media Pi concentration, mineralization, and Spp1 and Dmp1 marker gene expression in WT and Ibsp-/- OCCM.30 cementoblasts. Use of phosphonoformic acid, a nonspecific inhibitor of sodium Pi cotransport, indicated that effects of bovine intestinal ALP on mineralization and marker gene expression were in part through Pi transport. These findings show for the first time through multiple in vivo and in vitro approaches that pharmacologic modulation of Pi/PPi metabolism can overcome periodontal breakdown and accomplish regeneration.
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Affiliation(s)
- A Nagasaki
- Laboratory of Oral Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
| | - K Nagasaki
- Laboratory of Oral Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
| | - B D Kear
- Laboratory of Oral Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
| | - W D Tadesse
- Laboratory of Oral Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
| | - V Thumbigere-Math
- Division of Periodontology, School of Dentistry, University of Maryland, Baltimore, MD, USA
| | - J L Millán
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - B L Foster
- Biosciences Division, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - M J Somerman
- Laboratory of Oral Connective Tissue Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
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Chu EY, Vo TD, Chavez MB, Nagasaki A, Mertz EL, Nociti FH, Aitken SF, Kavanagh D, Zimmerman K, Li X, Stabach PR, Braddock DT, Millán JL, Foster BL, Somerman MJ. Genetic and pharmacologic modulation of cementogenesis via pyrophosphate regulators. Bone 2020; 136:115329. [PMID: 32224162 PMCID: PMC7482720 DOI: 10.1016/j.bone.2020.115329] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 03/19/2020] [Accepted: 03/20/2020] [Indexed: 11/27/2022]
Abstract
Pyrophosphate (PPi) serves as a potent and physiologically important regulator of mineralization, with systemic and local concentrations determined by several key regulators, including: tissue-nonspecific alkaline phosphatase (ALPL gene; TNAP protein), the progressive ankylosis protein (ANKH; ANK), and ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1; ENPP1). Results to date have indicated important roles for PPi in cementum formation, and we addressed several gaps in knowledge by employing genetically edited mouse models where PPi metabolism was disrupted and pharmacologically modulating PPi in a PPi-deficient mouse model. We demonstrate that acellular cementum growth is inversely proportional to PPi levels, with reduced cementum in Alpl KO (increased PPi levels) mice and excess cementum in Ank KO mice (decreased PPi levels). Moreover, simultaneous ablation of Alpl and Ank results in reestablishment of functional cementum in dKO mice. Additional reduction of PPi by dual deletion of Ank and Enpp1 does not further increase cementogenesis, and PDL space is maintained in part through bone modeling/remodeling by osteoclasts. Our results provide insights into cementum formation and expand our knowledge of how PPi regulates cementum. We also demonstrate for the first time that pharmacologic manipulation of PPi through an ENPP1-Fc fusion protein can regulate cementum growth, supporting therapeutic interventions targeting PPi metabolism.
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Affiliation(s)
- E Y Chu
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA.
| | - T D Vo
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - M B Chavez
- Biosciences Division, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - A Nagasaki
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - E L Mertz
- National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, MD, USA
| | - F H Nociti
- Department of Prosthodontics & Periodontics, State University of Campinas, Piracicaba Dental School, Piracicaba, São Paulo, Brazil
| | - S F Aitken
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
| | - D Kavanagh
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - K Zimmerman
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - X Li
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - P R Stabach
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - D T Braddock
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - J L Millán
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - B L Foster
- Biosciences Division, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - M J Somerman
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institutes of Health (NIH), Bethesda, MD, USA
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Abstract
The objective of the present work was to investigate the effect of Periostin (POSTN) silencing on autophagy in osteoblasts, and provide an experimental basis for studying the mechanism of dental eruption. The cells were divided into the following four groups according to their viral number: the NC group, pFU-GW-016PSC53349-1; group KD1, LVpFU-GW-016PSC66471-1; group KD2, LVpFU-GW-016PSC66472-1; and group KD3, LVpFU-GW-016PSC66473-1. The lentiviral vector was infected at MOI = 100 in the ENi.S medium containing 5 g/mL Polybrene. The target gene expression was observed by a Celigo® Image Cytometer at 72 hours after infection, and the positive rate of fluorescence was noted. A two-step method of quantitative real-time PCR (qRT-PCR) was used to detect the silencing effect of POSTN. Western blotting was then performed to assess the expression of autophagy-related proteins Beclin-1 and LC3 in the group showing the best gene silencing effects. The experimental results showed that there was strong green fluorescence in group KD3. As confirmed via qRT-PCR analysis, the POSTN silencing efficiency in group KD3 reached 92.1%. The Western blotting revealed that the expression of Beclin-1 protein in group KD3 was significantly higher than that in the NC group. However, the LC3 protein expression was not significantly different from that of the control group. The lentiviral vector targeting POSTN in osteoblasts was constructed successfully. In addition, the expression of autophagy protein in mouse osteoblasts increased after POSTN silencing. This finding may provide new approaches for understanding the molecular signal transduction of POSTN during the tooth eruption process.
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Affiliation(s)
- Han Qin
- 1 Department of Stomatology, The Lianyungang Affiliated Hospital of Xuzhou Medical University, Liangyungang, China
| | - Jun Cai
- 2 Department of Anesthesia, The Maternal and Child Health Hospital of Lianyungang City, Liangyungang, China
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Yeom HG. Craniometaphyseal dysplasia: Report of 2 cases with an emphasis on panoramic imaging features. Imaging Sci Dent 2018; 48:283-287. [PMID: 30607353 PMCID: PMC6305782 DOI: 10.5624/isd.2018.48.4.283] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/17/2018] [Accepted: 09/02/2018] [Indexed: 01/05/2023] Open
Abstract
Craniometaphyseal dysplasia (CMD) is a rare hereditary disorder characterized by hyperostosis of the craniofacial bones and flared metaphyses of the long bones. Although some reports have described the dentomaxillofacial characteristics of CMD, including increased density of the jaw, malocclusion, and delayed eruption of the permanent teeth, only a few studies have reported the distinct imaging features of CMD on panoramic radiography. This report presents 2 cases of confirmed CMD patients with an emphasis on panoramic imaging features. The patients' images revealed hyperostosis and sclerosis of the maxilla and mandibular alveolar bone, but there was no change in the mandibular basal bone. In both cases, the mandibular condyle heads exhibited a short clubbed shape with hyperplasia of the coronoid process. For patients without clear otorhinolaryngological symptoms, common radiologic features of CMD could be visualized by routinely-taken panoramic radiographs, and further medical examinations and treatment can be recommended.
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Affiliation(s)
- Han-Gyeol Yeom
- Department of Oral and Maxillofacial Radiology and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
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8
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Basic fibroblast growth factor regulates phosphate/pyrophosphate regulatory genes in stem cells isolated from human exfoliated deciduous teeth. Stem Cell Res Ther 2018; 9:345. [PMID: 30526676 PMCID: PMC6288970 DOI: 10.1186/s13287-018-1093-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 11/12/2018] [Accepted: 11/27/2018] [Indexed: 12/17/2022] Open
Abstract
Background Basic fibroblast growth factor (bFGF) regulates maintenance of stemness and modulation of osteo/odontogenic differentiation and mineralization in stem cells from human exfoliated deciduous teeth (SHEDs). Mineralization in the bones and teeth is in part controlled by pericellular levels of inorganic phosphate (Pi), a component of hydroxyapatite, and inorganic pyrophosphate (PPi), an inhibitor of mineralization. The progressive ankylosis protein (gene ANKH; protein ANKH) and ectonucleotide pyrophosphatase phosphodiesterase 1 (ENPP1/ENPP1) increase PPi and inhibit mineralization, while tissue-nonspecific alkaline phosphatase (ALPL; TNAP) is a critical pro-mineralization enzyme that hydrolyzes PPi. We hypothesized that regulation by bFGF of mineralization in SHEDs occurs by modulation of Pi/PPi-associated genes. Methods Cells were isolated from human exfoliated deciduous teeth and characterized for mesenchymal stem cell characteristics. Cells were treated with bFGF, and the osteogenic differentiation ability was determined. The mRNA expression was evaluated using real-time polymerase chain reaction. The mineralization was examined using alizarin red S staining. Results Cells isolated from primary teeth expressed mesenchymal stem cell markers, CD44, CD90, and CD105, and were able to differentiate into osteo/odontogenic and adipogenic lineages. Addition of 10 ng/ml bFGF to SHEDs during in vitro osteo/odontogenic differentiation decreased ALPL mRNA expression and ALP enzyme activity, increased ANKH mRNA, and decreased both Pi/PPi ratio and mineral deposition. Effects of bFGF on ALPL and ANKH expression were detected within 24 h. Addition of 20 mM fibroblast growth factor receptor (FGFR) inhibitor SU5402 revealed the necessity of FGFR-mediated signaling, and inclusion of 1 μg/ml cyclohexamide (CHX) implicated the necessity of protein synthesis for effects on ALPL and ANKH. Addition of exogenous 10 μm PPi inhibited mineralization and increased ANKH, collagen type 1a1 (COL1A1), and osteopontin (SPP1) mRNA, while addition of exogenous Pi increased mineralization and osterix (OSX), ANKH, SPP1, and dentin matrix protein 1 (DMP1) mRNA. The effects of PPi and Pi on mineralization could be replicated by short-term 3- and 7-day treatments, suggesting signaling effects in addition to physicochemical regulation of mineral deposition. Conclusion This study reveals for the first time the effects of bFGF on Pi/PPi regulators in SHEDs and implicates these factors in how bFGF directs osteo/odontogenic differentiation and mineralization by these cells. Electronic supplementary material The online version of this article (10.1186/s13287-018-1093-9) contains supplementary material, which is available to authorized users.
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9
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Effect of Runx2 silencing on autophagy and RANKL expression in osteoblasts. Arch Oral Biol 2018; 95:74-78. [PMID: 30071409 DOI: 10.1016/j.archoralbio.2018.07.016] [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] [Received: 04/02/2018] [Revised: 07/21/2018] [Accepted: 07/23/2018] [Indexed: 12/27/2022]
Abstract
OBJECTIVE This study aimed to investigate the effect of Runx2 silencing on autophagy and RANKL expression in mouse osteoblasts, and provide an experimental basis to assess obstacles in dental eruption. METHODS In accordance with previously reported methods, LVpFU-GW-016PSC60109-1 virus was used to transfect mouse osteoblasts (MOI = 40). Target gene expression was assessed via cytometer, and the effect of silencing Runx2 was assessed via a two-step quantitative real-time polymerase chain reaction (qRT-PCR)-based method. Western blotting was performed to assess LC3, Beclin-1 and RANKL expression. RESULTS As confirmed via qRT-PCR analysis, Runx2 was efficiently silenced in the experimental group (>90% efficiency). Western blotting revealed that LC3 and RANKL proteins were significantly down -regulated in the experimental group (group KD), their expression levels being particularly lower than those in the control group (group NC). However, Beclin-1 protein expression was not significantly different from that of the control. CONCLUSION Upon Runx2 silencing, autophagy-related proteins and RANKL were repressed in osteoblasts, thereby potentially causing the tooth eruption disorder.
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Qin H, Xu HZ, Gong YQ. Mechanism of NF-κB signaling pathway and autophagy in the regulation of osteoblast differentiation. Mol Membr Biol 2017; 33:138-144. [PMID: 29166808 DOI: 10.1080/09687688.2017.1400601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The objective of the present work was to investigate a possible mechanism of NF-κB signaling pathway and autophagy in the regulation of osteoblast differentiation, and provide experimental basis for the study of tooth eruption disorder. METHODS Mouse osteoblast-like (MC3T3-E1) cells were inoculated with a cell density of 70%. According to the grouping experimental design, Western blot and monodansylcadaverine (MDC) detection were conducted after dosing for 24 h. The cells were divided into the following five groups: blank control group; 6.25 µg/mL SN50 group; 12.5 µg/mL SN50 group; 25 µg/mL SN50 group and 50 µg/mL SN50 group. RESULTS Western blot analysis revealed that the expression of LC3 protein was present in the blank control group; 6.25 µg/mL SN50 group; 12.5 µg/mL SN50 group and 50 µg/mL SN50 group, with no significant differences among these groups. However, the expression of LC3 protein was significantly lower in the 25 µg/mL SN50 group. MDC detection showed that, in the blank control group; 6.25 µg/mL SN50 group; 12.5 µg/mL SN50 group and 50 µg/mL SN50 group, there was obvious green fluorescence in the cytoplasm of the osteoblasts. However, in the 25 µg/mL SN50 group, it was found that there were significantly fewer green fluorescent particles. CONCLUSION The osteoblast itself had a strong function of autophagy. The appropriate concentration of SN50 in blocking the NF-κB pathway of the osteoblast was associated with the obvious inhibition of autophagy. However, the relationship between NF-κB signaling pathway and autophagy in the process of tooth eruption requires further study.
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Affiliation(s)
- Han Qin
- a Department of Stomatology , Lianyungang Affiliated Hospital of Xuzhou Medical University , Liangyungang , Jiangsu Province , China
| | - Hong-Zhi Xu
- a Department of Stomatology , Lianyungang Affiliated Hospital of Xuzhou Medical University , Liangyungang , Jiangsu Province , China
| | - Yong-Qing Gong
- a Department of Stomatology , Lianyungang Affiliated Hospital of Xuzhou Medical University , Liangyungang , Jiangsu Province , China
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Chen IP, Luxmi R, Kanaujiya J, Hao Z, Reichenberger EJ. Craniometaphyseal Dysplasia Mutations in ANKH Negatively Affect Human Induced Pluripotent Stem Cell Differentiation into Osteoclasts. Stem Cell Reports 2017; 9:1369-1376. [PMID: 29056330 PMCID: PMC5830990 DOI: 10.1016/j.stemcr.2017.09.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 09/20/2017] [Accepted: 09/22/2017] [Indexed: 01/09/2023] Open
Abstract
We identified osteoclast defects in craniometaphyseal dysplasia (CMD) using an easy-to-use protocol for differentiating osteoclasts from human induced pluripotent stem cells (hiPSCs). CMD is a rare genetic bone disorder, characterized by life-long progressive thickening of craniofacial bones and abnormal shape of long bones. hiPSCs from CMD patients with an in-frame deletion of Phe377 or Ser375 in ANKH are more refractory to in vitro osteoclast differentiation than control hiPSCs. To exclude differentiation effects due to genetic variability, we generated isogenic hiPSCs, which have identical genetic background except for the ANKH mutation. Isogenic hiPSCs with ANKH mutations formed fewer osteoclasts, resorbed less bone, expressed lower levels of osteoclast marker genes, and showed decreased protein levels of ANKH and vacuolar proton pump v-ATP6v0d2. This proof-of-concept study demonstrates that efficient and reproducible differentiation of isogenic hiPSCs into osteoclasts is possible and a promising tool for investigating mechanisms of CMD or other osteoclast-related disorders.
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Affiliation(s)
- I-Ping Chen
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health, 263 Farmington Avenue, Farmington, CT 06030, USA.
| | - Raj Luxmi
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health, 263 Farmington Avenue, Farmington, CT 06030, USA
| | - Jitendra Kanaujiya
- Center for Regenerative Medicine and Skeletal Development, Department of Reconstructive Sciences, University of Connecticut Health, Farmington, CT 06030, USA
| | - Zhifang Hao
- Department of Cell Biology, Center for Vascular Biology, University of Connecticut Health, Farmington, CT 06030, USA
| | - Ernst J Reichenberger
- Center for Regenerative Medicine and Skeletal Development, Department of Reconstructive Sciences, University of Connecticut Health, Farmington, CT 06030, USA
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12
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Chen IP, Tadinada A, Dutra EH, Utreja A, Uribe F, Reichenberger EJ. Dental Anomalies Associated with Craniometaphyseal Dysplasia. J Dent Res 2014; 93:553-8. [PMID: 24663682 DOI: 10.1177/0022034514529304] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 03/04/2014] [Indexed: 12/12/2022] Open
Abstract
Craniometaphyseal dysplasia (CMD) is a rare genetic disorder encompassing hyperostosis of craniofacial bones and metaphyseal widening of tubular bones. Dental abnormalities are features of CMD that have been little discussed in the literature. We performed dentofacial examination of patients with CMD and evaluated consequences of orthodontic movement in a mouse model carrying a CMD knock-in (KI) mutation (Phe377del) in the Ank gene. All patients have a history of delayed eruption of permanent teeth. Analysis of data obtained by cone-beam computed tomography showed significant bucco-lingual expansion of jawbones, more pronounced in mandibles than in maxillae. There was no measurable increase in bone density compared with that in unaffected individuals. Orthodontic cephalometric analysis showed that patients with CMD tend to have a short anterior cranial base, short upper facial height, and short maxillary length. Microcomputed tomography (micro-CT) analysis in homozygous Ank (KI/KI) mice, a model for CMD, showed that molars can be moved by orthodontic force without ankylosis, however, at a slower rate compared with those in wild-type Ank (+/+) mice (p < .05). Histological analysis of molars in Ank (KI/KI) mice revealed decreased numbers of TRAP(+) osteoclasts on the bone surface of pressure sides. Based on these findings, recommendations for the dental treatment of patients with CMD are provided.
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Affiliation(s)
- I-P Chen
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - A Tadinada
- Department of Oral Health and Diagnostic Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - E H Dutra
- Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - A Utreja
- Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - F Uribe
- Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - E J Reichenberger
- Department of Reconstructive Sciences, Center for Regenerative Medicine and Skeletal Development, University of Connecticut Health Center, Farmington, CT, USA
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