1
|
Razmadze D, Salomies L, Di-Poï N. Squamates as a model to understand key dental features of vertebrates. Dev Biol 2024; 516:1-19. [PMID: 39069116 DOI: 10.1016/j.ydbio.2024.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 06/11/2024] [Accepted: 07/23/2024] [Indexed: 07/30/2024]
Abstract
Thanks to their exceptional diversity, teeth are among the most distinctive features of vertebrates. Parameters such as tooth size, shape, number, identity, and implantation can have substantial implications for the ecology and certain social behaviors of toothed species. Despite decades of research primarily focused on mammalian dentition, particularly using the laboratory mouse model, squamate reptiles ("lizards" and snakes) offer a wide array of tooth types and dentition variations. This diversity, which includes differences in size, shape, function, and replacement capacity, provides invaluable opportunities for investigating these fundamental properties. The central bearded dragon (Pogona vitticeps), a popular pet species with well-established husbandry practices, is of particular interest. It features a broad spectrum of morphs and spontaneous mutants and exhibits a wide range of heterodont phenotypes, including variation in the size, shape, number, implantation, and renewal of teeth at both posterior and anterior positions. These characteristics position the species as a crucial model organism for developmental studies in tooth research and for gaining deeper insights into evolutionary patterns of vertebrate dentitions. In this article, we provide an overview of the current understanding of squamate dentition, its diversity, development, and replacement. Furthermore, we discuss the significant advantages offered by squamate species as model organisms for investigating the evolutionary and developmental aspects of vertebrate dentition.
Collapse
Affiliation(s)
- Daria Razmadze
- Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, 00014, Helsinki, Finland
| | - Lotta Salomies
- Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, 00014, Helsinki, Finland
| | - Nicolas Di-Poï
- Institute of Biotechnology, Helsinki Institute of Life Science, University of Helsinki, 00014, Helsinki, Finland.
| |
Collapse
|
2
|
Sun M, Li N, Zhang W, Li A, Li Y. A double-negative feedback loop mediated by non-coding RNAs contributes to tooth morphogenesis. Cells Dev 2024; 179:203932. [PMID: 38852677 DOI: 10.1016/j.cdev.2024.203932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/19/2024] [Accepted: 06/06/2024] [Indexed: 06/11/2024]
Abstract
Tooth morphogenesis is a critically ordered process manipulated by a range of signaling factors. Particularly, the involvement of fine-tuned signaling mediated by non-coding RNAs has been of longstanding interest. Here, we revealed a double-negative feedback loop acted by a long non-coding RNA (LOC102159588) and a microRNA (miR-133b) that modulated tooth morphogenesis of miniature swine. Mechanistically, miR-133b repressed the transcription of LOC102159588 through downstream target Sp1. Conversely, LOC102159588 not only inhibited the transport of pre-miR-133b from the nucleus to the cytoplasm by regulating exportin-5 but also served as a sponge in the cytoplasm, suppressing functional miR-133b. Together, the double-negative feedback loop maintained normal tooth morphogenesis by modulating endogenous apoptosis. Related disruptions would lead to an arrest of tooth development and may result in tooth malformations.
Collapse
Affiliation(s)
- Meng Sun
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710049, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710000, China
| | - Na Li
- Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710000, China
| | - Weixing Zhang
- Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710000, China
| | - Ang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710049, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710000, China.
| | - Ye Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710049, China.
| |
Collapse
|
3
|
Shi Y, Yu Y, Li J, Sun S, Han L, Wang S, Guo K, Yang J, Qiu J, Wei W. Spatiotemporal cell landscape of human embryonic tooth development. Cell Prolif 2024:e13653. [PMID: 38867378 DOI: 10.1111/cpr.13653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 03/27/2024] [Accepted: 04/28/2024] [Indexed: 06/14/2024] Open
Abstract
Understanding the cellular composition and trajectory of human tooth development is valuable for dentistry and stem cell engineering research. Previous single-cell studies have focused on mature human teeth and developing mouse teeth, but the cell landscape of human embryonic dental development is still unknown. In this study, tooth germ tissues were collected from aborted foetus (17-24 weeks) for single-cell RNA sequence and spatial transcriptome analysis. The cells were classified into seven subclusters of epithelium, and seven clusters of mesenchyme, as well as other cell types such as Schwann cell precursor and pericyte. For epithelium, the stratum intermedium branch and the ameloblast branch diverged from the same set of outer enamel-inner enamel-ALCAM+ epithelial cell lineage, but their spatial distribution of two branches was not clearly distinct. This trajectory received spatially adjacent regulation signals from mesenchyme and pericyte, including JAG1 and APP. The differentiation of pulp cell and pre-odontoblast showed four waves of temporally distinct gene expression, which involved regulation networks of LHX9, DLX5 and SP7, and these genes were regulated by upstream ligands such as the BMP family. This provides a reference landscape for the research on early human tooth development, covering different spatial structures and developmental periods.
Collapse
Affiliation(s)
- Yueqi Shi
- Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yejia Yu
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Jutang Li
- Hongqiao International Institute of Medicine, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shoufu Sun
- Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li Han
- Department of Obstetrics and Gynecology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shaoyi Wang
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ke Guo
- Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingang Yang
- Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jin Qiu
- Department of Obstetrics and Gynecology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenjia Wei
- Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| |
Collapse
|
4
|
Huysseune A, Witten PE. Continuous tooth replacement: what can teleost fish teach us? Biol Rev Camb Philos Soc 2024; 99:797-819. [PMID: 38151229 DOI: 10.1111/brv.13045] [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: 01/11/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 12/29/2023]
Abstract
Most tooth-bearing non-mammalian vertebrates have the capacity to replace their teeth throughout life. This capacity was lost in mammals, which replace their teeth only once at most. Not surprisingly, continuous tooth replacement has attracted much attention. Classical morphological studies (e.g. to analyse patterns of replacement) are now being complemented by molecular studies that investigate the expression of genes involved in tooth formation. This review focuses on ray-finned fish (actinopterygians), which have teeth often distributed throughout the mouth and pharynx, and more specifically on teleost fish, the largest group of extant vertebrates. First we highlight the diversity in tooth distribution and in tooth replacement patterns. Replacement tooth formation can start from a distinct (usually discontinuous and transient) dental lamina, but also in the absence of a successional lamina, e.g. from the surface epithelium of the oropharynx or from the outer dental epithelium of a predecessor tooth. The relationship of a replacement tooth to its predecessor is closely related to whether replacement is the result of a prepattern or occurs on demand. As replacement teeth do not necessarily have the same molecular signature as first-generation teeth, the question of the actual trigger for tooth replacement is discussed. Much emphasis has been laid in the past on the potential role of epithelial stem cells in initiating tooth replacement. The outcome of such studies has been equivocal, possibly related to the taxa investigated, and the permanent or transient nature of the dental lamina. Alternatively, replacement may result from local proliferation of undifferentiated progenitors, stimulated by hitherto unknown, perhaps mesenchymal, factors. So far, the role of the neurovascular link in continuous tooth replacement has been poorly investigated, despite the presence of a rich vascularisation surrounding actinopterygian (as well as chondrichthyan) teeth and despite a complete arrest of tooth replacement after nerve resection. Lastly, tooth replacement is possibly co-opted as a process to expand the number of teeth in a dentition ontogenetically whilst conserving features of the primary dentition. That neither a dental lamina, nor stem cells appear to be required for tooth replacement places teleosts in an advantageous position as models for tooth regeneration in humans, where the dental lamina regresses and epithelial stem cells are considered lost.
Collapse
Affiliation(s)
- Ann Huysseune
- Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, K.L. Ledeganckstraat 35, Ghent, B-9000, Belgium
- Department of Zoology, Faculty of Science, Charles University, Vinicna 7, Prague, 128 44, Czech Republic
| | - P Eckhard Witten
- Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, K.L. Ledeganckstraat 35, Ghent, B-9000, Belgium
| |
Collapse
|
5
|
Yang DW, Kang JH, Kim MS, Kim SH. Regulatory role of N-myc downregulated genes in amelogenesis in rats. J Mol Histol 2024; 55:149-157. [PMID: 38407765 DOI: 10.1007/s10735-024-10182-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 02/06/2024] [Indexed: 02/27/2024]
Abstract
Cytodifferentiation of odontogenic cells, a late stage event in odontogenesis is based on gene regulation. However, studies on the identification of the involved genes are scarce. The present study aimed to search for molecules for the cytodifferentiation of ameloblastic cells in rats. Differential display-PCR revealed a differentially expressed gene between cap/early bell stage and hard tissue formation stage in molars. This gene was identified as N-myc Downregulated Gene 1 (Ndrg1), which is the first report in tooth development. Real time PCR and western blotting confirmed that the mRNA level of Ndrg1 was higher during enamel formation than the cap stage. Ndrg1 expression was upregulated in the early bell, crown, and root stages in a time-dependent manner. These patterns of expression were similar in Ndrg2, but Ndrg3 and Ndrg4 levels did not change during the developmental stages. Immunofluorescence revealed that strong immunoreactivity against Ndrg1 were detected in differentiated ameloblasts only, not inner enamel epithelium, odontoblasts and ameloblastic cells in defected enamel regions. Alkaline phosphatase and alizarin red s stains along with real time PCR, revealed that Ndrg1 and Ndrg2 were involved in cytodifferentiation and enamel matrix mineralization by selectively regulating amelogenin and ameloblastin genes in SF2 ameloblastic cells. These results suggest that Ndrg may play a crucial functional role in the cytodifferentiation of ameloblasts for amelogenesis.
Collapse
Affiliation(s)
- Dong-Wook Yang
- Department of Oral Anatomy, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Jee-Hae Kang
- Department of Oral Anatomy, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Min-Seok Kim
- Department of Oral Anatomy, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 500-757, Republic of Korea.
| | - Sun-Hun Kim
- Department of Oral Anatomy, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, 500-757, Republic of Korea.
| |
Collapse
|
6
|
de La Dure-Molla M, Gaucher C, Dupré N, Bloch Zupan A, Berdal A, Chaussain C. [The tooth: A marker of developmental abnormalities]. Med Sci (Paris) 2024; 40:16-23. [PMID: 38299898 DOI: 10.1051/medsci/2023190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024] Open
Abstract
Tooth formation results from specific epithelial-mesenchymal interactions, which summarize a number of developmental processes. Tooth anomalies may thus reflect subclinical diseases of the kidney, bone and more broadly of the mineral metabolism, skin or nervous system. Odontogenesis starts from the 3rd week of intrauterine life by the odontogenic orientation of epithelial cells by a first PITX2 signal. The second phase is the acquisition of the number, shape, and position of teeth. It depends on multiple transcription and growth factors (BMP, FGF, SHH, WNT). These ecto-mesenchymal interactions guide cell migration, proliferation, apoptosis and differentiation ending in the formation of the specific dental mineralized tissues. Thus, any alteration will have consequences on the tooth structure or shape. Resulting manifestations will have to be considered in the patient phenotype and the multidisciplinary care, but also may contribute to identify the altered genetic circuity.
Collapse
Affiliation(s)
- Muriel de La Dure-Molla
- Centre de référence maladies rares orales et dentaires, O-Rares, hôpital Rothschild, AP-HP, Paris ; université Paris Cité, UFR d'odontologie, Inserm, UMR1163, bases moléculaires et physiopathologiques des ostéochondrodysplasies, institut imagine, Paris ; FHU DDS Paris-Net, filière TETECOU, European Reference Network CRANIO
| | - Céline Gaucher
- FHU DDS Paris-Net, université Paris Cité, Inserm, AP-HP ; laboratoire BRIO URP2496, UFR d'odontologie, université Paris Cité, France ; Service de médecine bucco-dentaire, hôpital Henri Mondor, AP-HP ; Service de médecine génomique des maladies rares de système et d'organe, hôpital Cochin, AP-HP, Centre-Université Paris Cité, Montrouge, France
| | - Nicolas Dupré
- FHU DDS Paris-Net, université Paris Cité, Inserm, APHP ; équipe « Physiopathologie orale moléculaire », Centre de recherche des Cordeliers, Inserm U1138, université Paris Cité, Sorbonne université. UFR d'odontologie université Paris Cité. Centre de référence maladies rares O-Rares, hôpital Rothschild, AP-HP, Paris ; filière TETECOU, European Reference Network CRANIO, Paris
| | - Agnès Bloch Zupan
- Université de Strasbourg, institut de génétique et de biologie moléculaire et cellulaire (IGBMC), Inserm U1258, CNRS- UMR7104, Illkirch ; faculté de chirurgie dentaire Robert Frank ; institut d'études avancées (USIAS) ; Hôpitaux universitaires de Strasbourg (HUS), pôle de médecine et chirurgie bucco-dentaires, hôpital civil, centre de référence des maladies rares orales et dentaires O-Rares, filière santé maladies rares TETE COU, European Reference Network CRANIO, Strasbourg
| | - Ariane Berdal
- FHU DDS Paris-Net, université Paris Cité, Inserm AP-HP, équipe « Physiopathologie orale moléculaire », centre de recherche des Cordeliers, Inserm U1138, université Paris Cité, Sorbonne université. UFR d'odontologie, université Paris Cité. centre de référence maladies Rares O-Rares, hôpital Rothschild, AP-HP, Paris, filière TETECOU, European Reference Network CRANIO, Paris
| | - Catherine Chaussain
- FHU DDS Paris-Net, université Paris Cité, Inserm, AP-HP ; laboratoire BRIO URP2496, UFR d'odontologie ; AP-HP, hôpital Bretonneau ; centre de référence maladies Rares du métabolisme du calcium, phosphate et magnésium, filière OSCAR, European Reference Network BOND, Paris
| |
Collapse
|
7
|
Alghadeer A, Hanson-Drury S, Patni AP, Ehnes DD, Zhao YT, Li Z, Phal A, Vincent T, Lim YC, O'Day D, Spurrell CH, Gogate AA, Zhang H, Devi A, Wang Y, Starita L, Doherty D, Glass IA, Shendure J, Freedman BS, Baker D, Regier MC, Mathieu J, Ruohola-Baker H. Single-cell census of human tooth development enables generation of human enamel. Dev Cell 2023; 58:2163-2180.e9. [PMID: 37582367 PMCID: PMC10629594 DOI: 10.1016/j.devcel.2023.07.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 05/05/2023] [Accepted: 07/19/2023] [Indexed: 08/17/2023]
Abstract
Tooth enamel secreted by ameloblasts (AMs) is the hardest material in the human body, acting as a shield to protect the teeth. However, the enamel is gradually damaged or partially lost in over 90% of adults and cannot be regenerated due to a lack of ameloblasts in erupted teeth. Here, we use single-cell combinatorial indexing RNA sequencing (sci-RNA-seq) to establish a spatiotemporal single-cell census for the developing human tooth and identify regulatory mechanisms controlling the differentiation process of human ameloblasts. We identify key signaling pathways involved between the support cells and ameloblasts during fetal development and recapitulate those findings in human ameloblast in vitro differentiation from induced pluripotent stem cells (iPSCs). We furthermore develop a disease model of amelogenesis imperfecta in a three-dimensional (3D) organoid system and show AM maturation to mineralized structure in vivo. These studies pave the way for future regenerative dentistry.
Collapse
Affiliation(s)
- Ammar Alghadeer
- Department of Biomedical Dental Sciences, Imam Abdulrahman bin Faisal University, College of Dentistry, Dammam 31441, Saudi Arabia; Department of Oral Health Sciences University of Washington, School of Dentistry, Seattle, WA 98109, USA; Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Sesha Hanson-Drury
- Department of Oral Health Sciences University of Washington, School of Dentistry, Seattle, WA 98109, USA; Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Anjali P Patni
- Department of Oral Health Sciences University of Washington, School of Dentistry, Seattle, WA 98109, USA; Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Cancer Biology and Stem Cell Biology Laboratory, Department of Genetic Engineering, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, Chennai 603203, India
| | - Devon D Ehnes
- Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Yan Ting Zhao
- Department of Oral Health Sciences University of Washington, School of Dentistry, Seattle, WA 98109, USA; Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Zicong Li
- Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Ashish Phal
- Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Thomas Vincent
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Yen C Lim
- Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Diana O'Day
- Department of Pediatrics, University of Washington, Seattle, WA 98195, USA; Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA
| | - Cailyn H Spurrell
- Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA
| | - Aishwarya A Gogate
- Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA; Seattle Children's Research Institute, Seattle, WA 98195, USA
| | - Hai Zhang
- Department of Restorative Dentistry, University of Washington, School of Dentistry, Seattle, WA 98195, USA
| | - Arikketh Devi
- Cancer Biology and Stem Cell Biology Laboratory, Department of Genetic Engineering, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, Chennai 603203, India
| | - Yuliang Wang
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Paul G. Allen School of Computer Science and Engineering, University of Washington, Seattle, WA 98195, USA
| | - Lea Starita
- Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA; Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Dan Doherty
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Pediatrics, University of Washington, Seattle, WA 98195, USA; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA 98195, USA
| | - Ian A Glass
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Pediatrics, University of Washington, Seattle, WA 98195, USA; Center for Integrative Brain Research, Seattle Children's Research Institute, Seattle, WA 98195, USA
| | - Jay Shendure
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA; Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Benjamin S Freedman
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Bioengineering, University of Washington, Seattle, WA 98195, USA; Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Seattle WA 98109
| | - David Baker
- Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA; Department of Bioengineering, University of Washington, Seattle, WA 98195, USA; Institute for Protein Design, University of Washington, Seattle, WA 98195, USA
| | - Mary C Regier
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Julie Mathieu
- Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Comparative Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA
| | - Hannele Ruohola-Baker
- Department of Biomedical Dental Sciences, Imam Abdulrahman bin Faisal University, College of Dentistry, Dammam 31441, Saudi Arabia; Department of Oral Health Sciences University of Washington, School of Dentistry, Seattle, WA 98109, USA; Department of Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA; Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA; Department of Bioengineering, University of Washington, Seattle, WA 98195, USA.
| |
Collapse
|
8
|
Zhang H, Gong X, Xu X, Wang X, Sun Y. Tooth number abnormality: from bench to bedside. Int J Oral Sci 2023; 15:5. [PMID: 36604408 PMCID: PMC9816303 DOI: 10.1038/s41368-022-00208-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/24/2022] [Accepted: 11/01/2022] [Indexed: 01/07/2023] Open
Abstract
Tooth number abnormality is one of the most common dental developmental diseases, which includes both tooth agenesis and supernumerary teeth. Tooth development is regulated by numerous developmental signals, such as the well-known Wnt, BMP, FGF, Shh and Eda pathways, which mediate the ongoing complex interactions between epithelium and mesenchyme. Abnormal expression of these crutial signalling during this process may eventually lead to the development of anomalies in tooth number; however, the underlying mechanisms remain elusive. In this review, we summarized the major process of tooth development, the latest progress of mechanism studies and newly reported clinical investigations of tooth number abnormality. In addition, potential treatment approaches for tooth number abnormality based on developmental biology are also discussed. This review not only provides a reference for the diagnosis and treatment of tooth number abnormality in clinical practice but also facilitates the translation of basic research to the clinical application.
Collapse
Affiliation(s)
- Han Zhang
- grid.24516.340000000123704535Department of Implantology, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Xuyan Gong
- grid.24516.340000000123704535Department of Implantology, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Xiaoqiao Xu
- grid.24516.340000000123704535Department of Implantology, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Xiaogang Wang
- grid.64939.310000 0000 9999 1211Key Laboratory of Big Data-Based Precision Medicine, School of Engineering Medicine, Beihang University, Beijing, China
| | - Yao Sun
- Department of Implantology, Stomatological Hospital and Dental School of Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China.
| |
Collapse
|
9
|
Hu H, Duan Y, Wang K, Fu H, Liao Y, Wang T, Zhang Z, Kang F, Zhang B, Zhang H, Huo F, Yin Y, Chen G, Hu H, Cai H, Tian W, Li Z. Dental niche cells directly contribute to tooth reconstitution and morphogenesis. Cell Rep 2022; 41:111737. [PMID: 36476878 DOI: 10.1016/j.celrep.2022.111737] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/10/2022] [Accepted: 11/07/2022] [Indexed: 12/12/2022] Open
Abstract
Mammalian teeth develop from the inductive epithelial-mesenchymal interaction, an important mechanism shared by many organs. The cellular basis for such interaction remains elusive. Here, we generate a dual-fluorescence model to track and analyze dental cells from embryonic to postnatal stages, in which Pitx2+ epithelium and Msx1+ mesenchyme are sufficient for tooth reconstitution. Single-cell RNA sequencing and spatial mapping further revealed critical cellular dynamics during molar development, where tooth germs are organized by Msx1+Sdc1+ dental papilla and surrounding dental niche. Surprisingly, niche cells are more efficient in tooth reconstitution and can directly regenerate papilla cells through interaction with dental epithelium. Finally, from the dental niche, we identify a group of previously unappreciated migratory Msx1+ Sox9+ cells as the potential cell origin for dental papilla. Our results indicate that the dental niche cells directly contribute to tooth organogenesis and provide critical insights into the essential cell composition for tooth engineering.
Collapse
Affiliation(s)
- Hong Hu
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Yufeng Duan
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Kun Wang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Huancheng Fu
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Yuansong Liao
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Tianshu Wang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Ziwei Zhang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Fanchen Kang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Baiquan Zhang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Haiying Zhang
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Fangjun Huo
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yike Yin
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Guoqing Chen
- National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Hongbo Hu
- Department of Rheumatology and Immunology, Department of Urology, Department of Pathology, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, China
| | - Haoyang Cai
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China.
| | - Weidong Tian
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Zhonghan Li
- State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Center of Growth Metabolism and Aging, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| |
Collapse
|
10
|
Amin R, Talwar A. Factors Influencing the Aggressive Behavior of Odontogenic Keratocyst: A Narrative Review. JOURNAL OF HEALTH AND ALLIED SCIENCES NU 2022. [DOI: 10.1055/s-0042-1758036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
AbstractDuring odontogenesis, the dental lamina disintegrates, leaving behind the remnants. Odontogenic pathologies such as cysts and tumors can arise from these remnants. The odontogenic keratocyte (OKC) arises from dental lamina remnants. Among the cysts, the odontogenic keratocyst is the most controversial. There is convincing evidence that inflammation plays a significant role in the pathogenesis and expansion of OKCs. Several factors mediate the proliferative capacity of the epithelial lining. The presence of mast cells close to the epithelial lining, cystic pressure build-up by vascular endothelial growth factors (VEGFs), and other cytokines contribute to the cystic expansion. Fibroblast activation by inflammation in the connective tissue stroma and changes in the epithelial lining are responsible for the aggressive nature of OKC. The use of molecular methodologies gives more profound insights into the factors influencing the progression of the lesion and helps develop newer treatment modalities for OKC. This review describes the characteristics that determine the aggressive behavior of this unique cyst.
Collapse
Affiliation(s)
- Reshma Amin
- Nitte (Deemed to be University), AB Shetty Memorial Institute of Dental Science, Department of Oral Pathology, Mangalore
| | - Avaneendra Talwar
- Nitte (Deemed to be University), AB Shetty Memorial Institute of Dental Science, Mangalore
| |
Collapse
|
11
|
Bermúdez de Castro JM, García-Campos C, Sarmiento S, Martinón-Torres M. The protoconid: a key cusp in lower molars. Evidence from a recent modern human population. Ann Hum Biol 2022; 49:145-151. [PMID: 35521995 DOI: 10.1080/03014460.2022.2074539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
BACKGROUND The molar (M) size sequence in the genus Homo is decreasing and the general pattern in Homo sapiens is M1 > M2 > M3. AIM To gain a better understanding of the reduction patterns of molar components (cusps), we aim to assess the area of the protoconid, the phylogenetically oldest cusp of the lower molars. SUBJECT AND METHODS We measured the protoconid and the total crown area in the scaled photographs of a recent modern human sample of lower molars (76 males and 39 females). The values were statistically analysed. RESULTS The absolute size of the protoconid increases significantly between M1 and M2/M3, whereas the relative size of this cusp increases significantly from M1 to M3. In the latter, reduction or disappearance of the cusps of the talonid is common. CONCLUSIONS The results can be explained in the framework of the patterning cascade model. As the first cusp to appear developmentally, the protoconid forms in response to signals from the primary enamel knot, likely contributing to its stability. Inhibitory signals emitted during the protoconid formation may lead to the reduction or disappearance of the talonid cusps, if these do not have enough time to form before the end of the molar morphogenetic process.
Collapse
Affiliation(s)
- José María Bermúdez de Castro
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH). Paseo de la Sierra de Atapuerca 3, 09002, Burgos, Spain.,Anthropology Department, University College London, London, UK
| | - Cecilia García-Campos
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH). Paseo de la Sierra de Atapuerca 3, 09002, Burgos, Spain
| | - Susana Sarmiento
- Universidad Isabel I, Calle de Fernán González, 76, 09003 Burgos, Spain
| | - María Martinón-Torres
- Centro Nacional de Investigación sobre la Evolución Humana (CENIEH). Paseo de la Sierra de Atapuerca 3, 09002, Burgos, Spain.,Anthropology Department, University College London, London, UK
| |
Collapse
|
12
|
Ahmed HMA. A critical analysis of laboratory and clinical research methods to study root and canal anatomy. Int Endod J 2022; 55 Suppl 2:229-280. [DOI: 10.1111/iej.13702] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Hany Mohamed Aly Ahmed
- Department of Restorative Dentistry Faculty of Dentistry University of Malaya Kuala Lumpur
| |
Collapse
|
13
|
Bermúdez de Castro JM, Modesto‐Mata M, García‐Campos C, Sarmiento S, Martín‐Francés L, Martínez de Pinillos M, Martinón‐Torres M. Testing the inhibitory cascade model in a recent human sample. J Anat 2021; 239:1170-1181. [PMID: 34227109 PMCID: PMC8546523 DOI: 10.1111/joa.13500] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 01/09/2023] Open
Abstract
The Inhibitory Cascade Model was proposed by Kavanagh and colleagues (Nature, 449, 427-433 [2007]) after their experimental studies on the dental development of murine rodent species. These authors described an activator-inhibitor mechanism that has been employed to predict evolutionary size patterns of mammalian teeth, including hominins. In the present study, we measured the crown area of the three lower permanent molars (M1, M2, and M3) of a large recent modern human sample of male and female individuals from a collection preserved at the Institute of Anthropology of the University of Coimbra (Portugal). The main aim of the present study is to test if the size molar patterns observed in this human sample fits the Inhibitory Cascade Model. For this purpose, we first measured the crown area in those individuals preserving the complete molar series. Measurements were taken in photographs, using a planimeter and following well-tested techniques used in previous works. We then plot the M3 /M1 and M2 /M1 size ratios. Our results show that the premise of the Inhibitory Cascade Model, according to which the average of the crown area of M2 is approximately one-third of the sum of the crown area of the three molars, is fulfilled. However, our results also show that the individual values of a significant number of males and females are out of the 95% confidence interval predicted by the Inhibitory Cascade Model in rodents. As a result, the present analyses suggest that neither the sample of males, nor that of females, nor the pooled sample fits the Inhibitory Cascade Model. It is important to notice that, although this model has been successfully tested in a large number of current human populations, to the best of our knowledge this is the first study in which individual data have been obtained in a recent human population rather than using the average of the sample. Our results evince that, at the individual level, some factors not yet known could interfere with this model masking the modulation of the size on the molar series in modern humans. We suggest that the considerable delay in the onset of M3 formation in modern humans could be related to a weakening of the possible activation/inhibition process for this tooth. Finally, and in support of our conclusions, we have checked that the absolute and relative size of M1 and M2 is not related to the M3 agenesis in our sample. In line with other studies in primates, our results do not support the Inhibitory Cascade Model in a recent human sample. Further research is needed to better understand the genetic basis of this mechanism and its relationship to the phenotype. In this way, we may be able to find out which evolutionary changes may be responsible for the deviations observed in many species, including Homo sapiens.
Collapse
Affiliation(s)
- José María Bermúdez de Castro
- CENIEH (National Research Center on Human Evolution)BurgosSpain
- Anthropology DepartmentUniversity College LondonLondonUK
| | - Mario Modesto‐Mata
- Equipo Primeros Pobladores de ExtremaduraCasa de la Cultura Rodríguez MoñinoCáceresSpain
| | - Cecilia García‐Campos
- CENIEH (National Research Center on Human Evolution)BurgosSpain
- Fundación AtapuercaIbeas de JuarrosBurgosSpain
| | | | - Laura Martín‐Francés
- CENIEH (National Research Center on Human Evolution)BurgosSpain
- Anthropology DepartmentUniversity College LondonLondonUK
- Fundación AtapuercaIbeas de JuarrosBurgosSpain
| | | | - María Martinón‐Torres
- CENIEH (National Research Center on Human Evolution)BurgosSpain
- Anthropology DepartmentUniversity College LondonLondonUK
| |
Collapse
|
14
|
Huysseune A, Cerny R, Witten PE. The conundrum of pharyngeal teeth origin: the role of germ layers, pouches, and gill slits. Biol Rev Camb Philos Soc 2021; 97:414-447. [PMID: 34647411 PMCID: PMC9293187 DOI: 10.1111/brv.12805] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 09/27/2021] [Accepted: 09/29/2021] [Indexed: 12/15/2022]
Abstract
There are several competing hypotheses on tooth origins, with discussions eventually settling in favour of an 'outside-in' scenario, in which internal odontodes (teeth) derived from external odontodes (skin denticles) in jawless vertebrates. The evolution of oral teeth from skin denticles can be intuitively understood from their location at the mouth entrance. However, the basal condition for jawed vertebrates is arguably to possess teeth distributed throughout the oropharynx (i.e. oral and pharyngeal teeth). As skin denticle development requires the presence of ectoderm-derived epithelium and of mesenchyme, it remains to be answered how odontode-forming skin epithelium, or its competence, were 'transferred' deep into the endoderm-covered oropharynx. The 'modified outside-in' hypothesis for tooth origins proposed that this transfer was accomplished through displacement of odontogenic epithelium, that is ectoderm, not only through the mouth, but also via any opening (e.g. gill slits) that connects the ectoderm to the epithelial lining of the pharynx (endoderm). This review explores from an evolutionary and from a developmental perspective whether ectoderm plays a role in (pharyngeal) tooth and denticle formation. Historic and recent studies on tooth development show that the odontogenic epithelium (enamel organ) of oral or pharyngeal teeth can be of ectodermal, endodermal, or of mixed ecto-endodermal origin. Comprehensive data are, however, only available for a few taxa. Interestingly, in these taxa, the enamel organ always develops from the basal layer of a stratified epithelium that is at least bilayered. In zebrafish, a miniaturised teleost that only retains pharyngeal teeth, an epithelial surface layer with ectoderm-like characters is required to initiate the formation of an enamel organ from the basal, endodermal epithelium. In urodele amphibians, the bilayered epithelium is endodermal, but the surface layer acquires ectodermal characters, here termed 'epidermalised endoderm'. Furthermore, ectoderm-endoderm contacts at pouch-cleft boundaries (i.e. the prospective gill slits) are important for pharyngeal tooth initiation, even if the influx of ectoderm via these routes is limited. A balance between sonic hedgehog and retinoic acid signalling could operate to assign tooth-initiating competence to the endoderm at the level of any particular pouch. In summary, three characters are identified as being required for pharyngeal tooth formation: (i) pouch-cleft contact, (ii) a stratified epithelium, of which (iii) the apical layer adopts ectodermal features. These characters delimit the area in which teeth can form, yet cannot alone explain the distribution of teeth over the different pharyngeal arches. The review concludes with a hypothetical evolutionary scenario regarding the persisting influence of ectoderm on pharyngeal tooth formation. Studies on basal osteichthyans with less-specialised types of early embryonic development will provide a crucial test for the potential role of ectoderm in pharyngeal tooth formation and for the 'modified outside-in' hypothesis of tooth origins.
Collapse
Affiliation(s)
- Ann Huysseune
- Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, K.L. Ledeganckstraat 35, Ghent, B-9000, Belgium
| | - Robert Cerny
- Department of Zoology, Faculty of Science, Charles University, Vinicna 7, Prague, 128 44, Czech Republic
| | - P Eckhard Witten
- Research Group Evolutionary Developmental Biology, Biology Department, Ghent University, K.L. Ledeganckstraat 35, Ghent, B-9000, Belgium
| |
Collapse
|
15
|
Shi Y, Yu Y, Zhou Y, Zhao J, Zhang W, Zou D, Song W, Wang S. A single-cell interactome of human tooth germ from growing third molar elucidates signaling networks regulating dental development. Cell Biosci 2021; 11:178. [PMID: 34600587 PMCID: PMC8487529 DOI: 10.1186/s13578-021-00691-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 09/16/2021] [Indexed: 01/17/2023] Open
Abstract
Background Development of dental tissue is regulated by extensive cell crosstalk based on various signaling molecules, such as bone morphogenetic protein (BMP) and fibroblast growth factor (FGF) pathways. However, an intact network of the intercellular regulation is still lacking. Result To gain an unbiased and comprehensive view of this dental cell interactome, we applied single-cell RNA-seq on immature human tooth germ of the growing third molar, discovered refined cell subtypes, and applied multiple network analysis to identify the central signaling pathways. We found that immune cells made up over 80% of all tooth germ cells, which exhibited profound regulation on dental cells via Transforming growth factor-β, Tumor necrosis factor (TNF) and Interleukin-1. During osteoblast differentiation, expression of genes related to extracellular matrix and mineralization was continuously elevated by signals from BMP and FGF family. As for the self-renewal of apical papilla stem cell, BMP-FGFR1-MSX1 pathway directly regulated the G0-to-S cell cycle transition. We also confirmed that Colony Stimulating Factor 1 secreted from pericyte and TNF Superfamily Member 11 secreted from osteoblast regulated a large proportion of genes related to osteoclast transformation from macrophage and monocyte. Conclusions We constructed the intercellular signaling networks that regulated the essential developmental process of human tooth, which served as a foundation for future dental regeneration engineering and the understanding of oral pathology. Supplementary Information The online version contains supplementary material available at 10.1186/s13578-021-00691-5.
Collapse
Affiliation(s)
- Yueqi Shi
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,Department of Stomatology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200336, China
| | - Yejia Yu
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yuqiong Zhou
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Jun Zhao
- Department of Orthodontics, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Wenjie Zhang
- Department of Prosthodontics, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Duohong Zou
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Weichen Song
- Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Shaoyi Wang
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology, National Center for Stomatology, National Clinical Research Center for Oral Diseases, College of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
| |
Collapse
|
16
|
Mu H, Liu X, Geng S, Su D, Chang H, Li L, Jin H, Wang X, Li Y, Zhang B, Xie X. Epithelial Bone Morphogenic Protein 2 and 4 Are Indispensable for Tooth Development. Front Physiol 2021; 12:660644. [PMID: 34483952 PMCID: PMC8415269 DOI: 10.3389/fphys.2021.660644] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 06/16/2021] [Indexed: 11/23/2022] Open
Abstract
The Bmp2 and Bmp4 expressed in root mesenchyme were essential for the patterning and cellular differentiation of tooth root. The role of the epithelium-derived Bmps in tooth root development, however, had not been reported. In this study, we found that the double abrogation of Bmp2 and Bmp4 from mouse epithelium caused short root anomaly (SRA). The K14-cre;Bmp2f/f;Bmp4f/f mice exhibited a persistent Hertwig’s Epithelial Root Sheath (HERS) with the reduced cell death, and the down-regulated BMP-Smad4 and Erk signaling pathways. Moreover, the Shh expression in the HERS, the Shh-Gli1 signaling, and Nfic expression in the root mesenchyme of the K14-cre;Bmp2f/f;Bmp4f/f mice were also decreased, indicating a disrupted epithelium- mesenchyme interaction between HERS and root mesenchyme. Such disruption suppressed the Osx and Dspp expression in the root mesenchyme, indicating an impairment on the differentiation and maturation of root odontoblasts. The impaired differentiation and maturation of root odontoblasts could be rescued partially by transgenic Dspp. Therefore, although required in a low dosage and with a functional redundancy, the epithelial Bmp2 and Bmp4 were indispensable for the HERS degeneration, as well as the differentiation and maturation of root mesenchyme.
Collapse
Affiliation(s)
- Haibin Mu
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Institute of Hard Tissue Development and Regeneration, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Xin Liu
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Shuoshuo Geng
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Dian Su
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Heran Chang
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Lili Li
- Department of Stomatology, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Han Jin
- Institute of Hard Tissue Development and Regeneration, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Xiumei Wang
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ying Li
- Institute of Hard Tissue Development and Regeneration, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Bin Zhang
- Institute of Hard Tissue Development and Regeneration, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Heilongjiang Academy of Medical Sciences, Harbin, China
| | - Xiaohua Xie
- Department of Stomatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, China.,Institute of Hard Tissue Development and Regeneration, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
| |
Collapse
|
17
|
Peralta S, Duhamel GE, Katt WP, Heikinheimo K, Miller AD, Ahmed F, McCleary-Wheeler AL, Grenier JK. Comparative transcriptional profiling of canine acanthomatous ameloblastoma and homology with human ameloblastoma. Sci Rep 2021; 11:17792. [PMID: 34493785 PMCID: PMC8423744 DOI: 10.1038/s41598-021-97430-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 08/25/2021] [Indexed: 01/04/2023] Open
Abstract
Ameloblastomas are odontogenic tumors that are rare in people but have a relatively high prevalence in dogs. Because canine acanthomatous ameloblastomas (CAA) have clinicopathologic and molecular features in common with human ameloblastomas (AM), spontaneous CAA can serve as a useful translational model of disease. However, the molecular basis of CAA and how it compares to AM are incompletely understood. In this study, we compared the global genomic expression profile of CAA with AM and evaluated its dental origin by using a bulk RNA-seq approach. For these studies, healthy gingiva and canine oral squamous cell carcinoma served as controls. We found that aberrant RAS signaling, and activation of the epithelial-to-mesenchymal transition cellular program are involved in the pathogenesis of CAA, and that CAA is enriched with genes known to be upregulated in AM including those expressed during the early stages of tooth development, suggesting a high level of molecular homology. These results support the model that domestic dogs with spontaneous CAA have potential for pre-clinical assessment of targeted therapeutic modalities against AM.
Collapse
Affiliation(s)
- Santiago Peralta
- Department of Clinical Sciences, Clinical Programs Center, College of Veterinary Medicine, Cornell University, Box 31, Ithaca, NY, 14853, USA.
| | - Gerald E Duhamel
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - William P Katt
- Department of Molecular Medicine, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Kristiina Heikinheimo
- Department of Oral and Maxillofacial Surgery, Institute of Dentistry, University of Turku and Turku University Hospital, Turku, Finland
| | - Andrew D Miller
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Faraz Ahmed
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| | - Angela L McCleary-Wheeler
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
- Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, MO, 65211, USA
| | - Jennifer K Grenier
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA
| |
Collapse
|
18
|
Strategies for differentiation of hiPSCs into dental epithelial cell lineage. Cell Tissue Res 2021; 386:415-421. [PMID: 34302527 DOI: 10.1007/s00441-021-03512-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 07/15/2021] [Indexed: 10/20/2022]
Abstract
Different stem cell-based strategies, especially induced pluripotent stem cells (iPSCs), have been exploited to regenerate teeth or restore biological and physiological functions after tooth loss. Further research is needed to establish an optimized protocol to effectively differentiate human iPSCs (hiPSCs) into dental epithelial cells (DECs). In this study, various factors were precisely modulated to facilitate differentiation of hiPSCs into DECs, which are essential for the regeneration of functional teeth. Embryoid bodies (EBs) were formed from hiPSCs as embryo-like aggregates, retinoic acid (RA) was used as an early ectodermal inducer, and bone morphogenic protein 4 (BMP4) activity was manipulated. The characteristics of DECs were enhanced and preserved after culture in keratinocyte serum-free medium (K-SFM). The yielded cell population exhibited noticeable DEC characteristics, consistent with the expression of epithelial cell and ameloblast markers. DECs demonstrated odontogenic abilities by exerting an inductive effect on human dental pulp stem cells (hDPSCs) and forming a tooth-like structure with the mouse tooth mesenchyme. Overall, our differentiation protocol provides a practical approach for applying hiPSCs for tooth regeneration.
Collapse
|
19
|
Abramyan J, Geetha-Loganathan P, Šulcová M, Buchtová M. Role of Cell Death in Cellular Processes During Odontogenesis. Front Cell Dev Biol 2021; 9:671475. [PMID: 34222243 PMCID: PMC8250436 DOI: 10.3389/fcell.2021.671475] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 05/24/2021] [Indexed: 01/20/2023] Open
Abstract
The development of a tooth germ in a precise size, shape, and position in the jaw, involves meticulous regulation of cell proliferation and cell death. Apoptosis, as the most common type of programmed cell death during embryonic development, plays a number of key roles during odontogenesis, ranging from the budding of the oral epithelium during tooth initiation, to later tooth germ morphogenesis and removal of enamel knot signaling center. Here, we summarize recent knowledge about the distribution and function of apoptotic cells during odontogenesis in several vertebrate lineages, with a special focus on amniotes (mammals and reptiles). We discuss the regulatory roles that apoptosis plays on various cellular processes during odontogenesis. We also review apoptosis-associated molecular signaling during tooth development, including its relationship with the autophagic pathway. Lastly, we cover apoptotic pathway disruption, and alterations in apoptotic cell distribution in transgenic mouse models. These studies foster a deeper understanding how apoptotic cells affect cellular processes during normal odontogenesis, and how they contribute to dental disorders, which could lead to new avenues of treatment in the future.
Collapse
Affiliation(s)
- John Abramyan
- Department of Natural Sciences, University of Michigan–Dearborn, Dearborn, MI, United States
| | | | - Marie Šulcová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
- Laboratory of Molecular Morphogenesis, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czechia
| | - Marcela Buchtová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
- Laboratory of Molecular Morphogenesis, Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czechia
| |
Collapse
|
20
|
Hovorakova M, Zahradnicek O, Bartos M, Hurnik P, Stransky J, Stembirek J, Tucker AS. Reawakening of Ancestral Dental Potential as a Mechanism to Explain Dental Pathologies. Integr Comp Biol 2021; 60:619-629. [PMID: 32492167 DOI: 10.1093/icb/icaa053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
During evolution, there has been a trend to reduce both the number of teeth and the location where they are found within the oral cavity. In mammals, the formation of teeth is restricted to a horseshoe band of odontogenic tissue, creating a single dental arch on the top and bottom of the jaw. Additional teeth and structures containing dental tissue, such as odontogenic tumors or cysts, can appear as pathologies. These tooth-like structures can be associated with the normal dentition, appearing within the dental arch, or in nondental areas. The etiology of these pathologies is not well elucidated. Reawakening of the potential to form teeth in different parts of the oral cavity could explain the origin of dental pathologies outside the dental arch, thus such pathologies are a consequence of our evolutionary history. In this review, we look at the changing pattern of tooth formation within the oral cavity during vertebrate evolution, the potential to form additional tooth-like structures in mammals, and discuss how this knowledge shapes our understanding of dental pathologies in humans.
Collapse
Affiliation(s)
- Maria Hovorakova
- Institute of Histology and Embryology, First Faculty of Medicine, Charles University in Prague, Albertov 4, 128 00 Prague 2, Czech Republic.,Institute of Experimental Medicine, Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic
| | - Oldrich Zahradnicek
- Institute of Experimental Medicine, Czech Academy of Sciences, Videnska 1083, 14220 Prague 4, Czech Republic
| | - Martin Bartos
- Department of Stomatology, First Faculty of Medicine, Charles University, General University Hospital in Prague, Katerinska 32, 12801 Prague 2, Czech Republic.,Institute of Anatomy, First Faculty of Medicine, Charles University, U Nemocnice 3, Prague 2, 128 00, Czech Republic
| | - Pavel Hurnik
- Department of Pathology, University Hospital Ostrava, 17. listopadu 1790, Ostrava-Poruba, 708 52, Czech Republic.,Department of Pathology at Faculty of Medicine, University of Ostrava, Syllabova 19, Ostrava-Zabreh, 703 00, Czech Republic
| | - Jiri Stransky
- Department of Oral and Maxillofacial Surgery, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava-Poruba, Czech Republic
| | - Jan Stembirek
- Department of Oral and Maxillofacial Surgery, University Hospital Ostrava, 17. listopadu 1790, 708 52 Ostrava-Poruba, Czech Republic.,Institute of Animal Physiology and Genetics, v.v.i., Czech Academy of Sciences, Veveri 97, 602 00, Brno 2, Czech Republic
| | - Abigail S Tucker
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral and Craniofacial Sciences, King's College London, London, SE1 9RT, UK
| |
Collapse
|
21
|
Kovacs CS, Chaussain C, Osdoby P, Brandi ML, Clarke B, Thakker RV. The role of biomineralization in disorders of skeletal development and tooth formation. Nat Rev Endocrinol 2021; 17:336-349. [PMID: 33948016 DOI: 10.1038/s41574-021-00488-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/19/2021] [Indexed: 02/03/2023]
Abstract
The major mineralized tissues are bone and teeth, which share several mechanisms governing their development and mineralization. This crossover includes the hormones that regulate circulating calcium and phosphate concentrations, and the genes that regulate the differentiation and transdifferentiation of cells. In developing endochondral bone and in developing teeth, parathyroid hormone-related protein (PTHrP) acts in chondrocytes to delay terminal differentiation, thereby increasing the pool of precursor cells. Chondrocytes and (in specific circumstances) pre-odontoblasts can also transdifferentiate into osteoblasts. Moreover, bone and teeth share outcomes when affected by systemic disorders of mineral homeostasis or of the extracellular matrix, and by adverse effects of treatments such as bisphosphonates and fluoride. Unlike bone, teeth have more permanent effects from systemic disorders because they are not remodelled after they are formed. This Review discusses the normal processes of bone and tooth development, followed by disorders that have effects on both bone and teeth, versus disorders that have effects in one without affecting the other. The takeaway message is that bone specialists should know when to screen for dental disorders, just as dental specialists should recognize when a tooth disorder should raise suspicions about a possible underlying bone disorder.
Collapse
Affiliation(s)
- Christopher S Kovacs
- Faculty of Medicine - Endocrinology, Memorial University of Newfoundland, St. John's, NL, Canada.
| | | | - Philip Osdoby
- Department of Biology, Washington University, St. Louis, MO, USA
| | - Maria Luisa Brandi
- Department of Biochemical, Experimental and Clinical Sciences, University of Florence, Florence, Italy
| | - Bart Clarke
- Mayo Clinic Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Rochester, MN, USA
| | - Rajesh V Thakker
- Academic Endocrine Unit, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| |
Collapse
|
22
|
Zhou C, Chen D, Ren J, Huang D, Li R, Luo H, Guan C, Cao Y, Wang W. FGF8 and BMP2 mediated dynamic regulation of dental mesenchyme proliferation and differentiation via Lhx8/Suv39h1 complex. J Cell Mol Med 2021; 25:3051-3062. [PMID: 33580754 PMCID: PMC7957265 DOI: 10.1111/jcmm.16351] [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] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 01/07/2021] [Accepted: 01/25/2021] [Indexed: 02/02/2023] Open
Abstract
The homeobox gene, LIM-homeobox 8 (Lhx8), has previously been identified as an essential transcription factor for dental mesenchymal development. However, how Lhx8 itself is regulated and regulates odontogenesis remains poorly understood. In this study, we employed an RNAscope assay to detect the co-expression pattern of Lhx8 and Suv39h1 in the dental mesenchyme, which coincided with the dynamic expression profiles of the early epithelium signal of Fibroblast Growth Factor 8 (FGF8) and the later mesenchymal signal Bone Morphogenetic Protein 2 (BMP2). Moreover, FGF8 activated Lhx8, whereas BMP2 repressed Lhx8 expression at the transcriptional level. The high expression of Lhx8 in the early dental mesenchyme maintained the cell fate in an undifferentiated status by interacting with Suv39h1, a histone-lysine N-methyltransferase constitutively expressed in the dental mesenchyme. Further in the ex vivo organ culture model, the knockdown of Suv39h1 significantly blocked the function of Lhx8 and FGF8. Mechanistically, Lhx8/Suv39h1 recognized the odontoblast differentiation-related genes and repressed gene expression via methylating H3K9 on their promoters. Taken together, our data here suggest that Lhx8/Suv39h1 complex is inversely regulated by epithelium-mesenchymal signals, balancing the differentiation and proliferation of dental mesenchyme via H3K9 methylation.
Collapse
Affiliation(s)
- Chen Zhou
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Danying Chen
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Jianhan Ren
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Delan Huang
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Runze Li
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Haotian Luo
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Chenyu Guan
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Yang Cao
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Weicai Wang
- Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China
| |
Collapse
|
23
|
Abstract
AbstractThe current review assesses the literature concerning the etiology of primary teeth staining and discoloration. The appearance of the dentition is of concern to many children and their caregivers seeking dental treatment as the color of the teeth is of aesthetic importance. The correct diagnosis of the cause of the discoloration is important as, invariably, it has a profound effect on treatment outcomes. It would seem reasonable, therefore, that dental practitioners understand the etiology of tooth discoloration to make a diagnosis and enable appropriate treatment to be conducted. Knowledge of the etiology of tooth staining is of importance to the dental practitioner to explain the patient the exact nature of the condition. In some instances, the mechanism of staining affects the outcome of the treatment and influences the options the dentist will be able to offer. Many of these contributing factors are preventable if parents are educated, managed by professional interventions, or provide a multidisciplinary approach. In this review, we highlight the importance of children smiles and the difference between primary and permanent teeth. We discuss the different types of primary teeth staining and discoloration and whether it is intrinsic or extrinsic, as well as the different impacts of some conditions on primary teeth compared with permanent teeth.
Collapse
Affiliation(s)
- Abdulfatah Alazmah
- Pediatric Dentistry Division, Department of Preventive Dental Science, College of Dentistry, Prince Sattam University, Alkharj, Saudi Arabia
| |
Collapse
|
24
|
Soukup V, Tazaki A, Yamazaki Y, Pospisilova A, Epperlein HH, Tanaka EM, Cerny R. Oral and Palatal Dentition of Axolotl Arises From a Common Tooth-Competent Zone Along the Ecto-Endodermal Boundary. Front Cell Dev Biol 2021; 8:622308. [PMID: 33505974 PMCID: PMC7829593 DOI: 10.3389/fcell.2020.622308] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/02/2020] [Indexed: 11/13/2022] Open
Abstract
Vertebrate dentitions arise at various places within the oropharyngeal cavity including the jaws, the palate, or the pharynx. These dentitions develop in a highly organized way, where new tooth germs are progressively added adjacent to the initiator center, the first tooth. At the same time, the places where dentitions develop house the contact zones between the outer ectoderm and the inner endoderm, and this colocalization has instigated various suggestions on the roles of germ layers for tooth initiation and development. Here, we study development of the axolotl dentition, which is a complex of five pairs of tooth fields arranged into the typically tetrapod outer and inner dental arcades. By tracking the expression patterns of odontogenic genes, we reason that teeth of both dental arcades originate from common tooth-competent zones, one present on the mouth roof and one on the mouth floor. Progressive compartmentalization of these zones and a simultaneous addition of new tooth germs distinct for each prospective tooth field subsequently control the final shape and composition of the axolotl dentition. Interestingly, by following the fate of the GFP-labeled oral ectoderm, we further show that, in three out of five tooth field pairs, the first tooth develops right at the ecto-endodermal boundary. Our results thus indicate that a single tooth-competent zone gives rise to both dental arcades of a complex tetrapod dentition. Further, we propose that the ecto-endodermal boundary running through this zone should be accounted for as a potential source of instruction factors instigating the onset of the odontogenic program.
Collapse
Affiliation(s)
- Vladimír Soukup
- Department of Zoology, Faculty of Science, Charles University, Prague, Czechia
| | - Akira Tazaki
- Max-Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Dresden, Germany.,Center for Regenerative Therapies, Technische Universität Dresden, Dresden, Germany
| | - Yosuke Yamazaki
- Department of Zoology, Faculty of Science, Charles University, Prague, Czechia
| | - Anna Pospisilova
- Department of Zoology, Faculty of Science, Charles University, Prague, Czechia
| | | | - Elly M Tanaka
- Max-Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG), Dresden, Germany.,Center for Regenerative Therapies, Technische Universität Dresden, Dresden, Germany
| | - Robert Cerny
- Department of Zoology, Faculty of Science, Charles University, Prague, Czechia
| |
Collapse
|
25
|
Jia S, Oliver JD, Turner EC, Renouard M, Bei M, Wright JT, D'Souza RN. Pax9's Interaction With the Ectodysplasin Signaling Pathway During the Patterning of Dentition. Front Physiol 2020; 11:581843. [PMID: 33329029 PMCID: PMC7732595 DOI: 10.3389/fphys.2020.581843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 11/05/2020] [Indexed: 11/30/2022] Open
Abstract
In these studies, we explored for the first time the molecular relationship between the paired-domain-containing transcription factor, Pax9, and the ectodysplasin (Eda) signaling pathway during mouse incisor formation. Mice that were deficient in both Pax9 and Eda were generated, and the status of dentition analyzed in all progeny using gross evaluation and histomorphometric means. When compared to wildtype controls, Pax9+/–Eda–/– mice lack mandibular incisors. Interestingly, Fgf and Shh signaling are down-regulated while Bmp4 and Lef1 appear unaffected. These findings suggest that Pax9-dependent signaling involves the Eda pathway and that this genetic relationship is important for mandibular incisor development. Studies of records of humans affected by mutations in PAX9 lead to the congenital absence of posterior dentition but interestingly involve agenesis of mandibular central incisors. The latter phenotype is exhibited by individuals with EDA or EDAR mutations. Thus, it is likely that PAX9, in addition to playing a role in the formation of more complex dentition, is also involved with EDA signaling in the initiation of odontogenesis within the incisal domain.
Collapse
Affiliation(s)
- Shihai Jia
- School of Dentistry, University of Utah Health, Salt Lake City, UT, United States
| | - Jeremie D Oliver
- School of Dentistry, University of Utah Health, Salt Lake City, UT, United States.,Department of Biomedical Engineering, College of Engineering, The University of Utah, Salt Lake City, UT, United States
| | - Emma C Turner
- Dental School, Faculty of Health and Medical Sciences, The University of Western Australia, Perth, WA, Australia
| | - Maranda Renouard
- College of Pharmacy, University of Utah Health, Salt Lake City, UT, United States
| | - Marianna Bei
- Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - J T Wright
- Adams School of Dentistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Rena N D'Souza
- School of Dentistry, University of Utah Health, Salt Lake City, UT, United States.,Department of Biomedical Engineering, College of Engineering, The University of Utah, Salt Lake City, UT, United States.,Department of Neurobiology and Anatomy, Pathology, and Surgery, The University of Utah, Salt Lake City, UT, United States
| |
Collapse
|
26
|
Yu Y, Li M, Zhou Y, Shi Y, Zhang W, Son G, Ge J, Zhao J, Zhang Z, Ye D, Yang C, Wang S. Activation of mesenchymal stem cells promotes new bone formation within dentigerous cyst. Stem Cell Res Ther 2020; 11:476. [PMID: 33168086 PMCID: PMC7653780 DOI: 10.1186/s13287-020-01999-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 10/26/2020] [Indexed: 11/18/2022] Open
Abstract
Background Dentigerous cyst (DC) is a bone destructive disease and remains a challenge for clinicians. Marsupialization enables the bone to regenerate with capsule maintaining, making it a preferred therapeutic means for DC adjacent to vital anatomical structures. Given that capsules of DC are derived from odontogenic epithelium remnants at the embryonic stage, we investigated whether there were mesenchymal stem cells (MSCs) located in DC capsules and the role that they played in the bone regeneration after marsupialization. Methods Samples obtained before and after marsupialization were used for histological detection and cell culture. The stemness of cells isolated from fresh tissues was analyzed by morphology, surface marker, and multi-differentiation assays. Comparison of proliferation ability between MSCs isolated from DC capsules before (Bm-DCSCs) and after (Am-DCSCs) marsupialization was evaluated by Cell Counting Kit-8 (CCK-8), fibroblast colony-forming units (CFU-F), and 5′-ethynyl-2′-deoxyuridine (EdU) assay. Their osteogenic capacity in vitro was detected by alkaline phosphatase (ALP) and Alizarin Red staining (ARS), combined with real-time polymerase chain reaction (RT-PCR) and immunofluorescence (IF) staining. Subcutaneous ectopic osteogenesis as well as cranial bone defect model in nude mice was performed to detect their bone regeneration and bone defect repairability. Results Bone tissue and strong ALP activity were detected in the capsule of DC after marsupialization. Two types of MSCs were isolated from fibrous capsules of DC both before (Bm-DCSCs) and after (Am-DCSCs) marsupialization. These fibroblast-like, colony-forming cells expressed MSC markers (CD44+, CD90+, CD31−, CD34−, CD45−), and they could differentiate into osteoblast-, adipocyte-, and chondrocyte-like cells under induction. Notably, Am-DCSCs performed better in cell proliferation and self-renewal. Moreover, Am-DCSCs showed a greater osteogenic capacity both in vitro and in vivo compared with Bm-DCSCs. Conclusions There are MSCs residing in capsules of DC, and the cell viability as well as the osteogenic capacity of them is largely enhanced after marsupialization. Our findings suggested that MSCs might play a crucial role in the healing process of DC after marsupialization, thus providing new insight into the treatment for DC by promoting the osteogenic differentiation of MSCs inside capsules.
Collapse
Affiliation(s)
- Yejia Yu
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mengyu Li
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuqiong Zhou
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yueqi Shi
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wenjie Zhang
- Department of Prosthodontics, Shanghai Engineering Research Centre of Advanced Dental Technology and Materials, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Geehun Son
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jing Ge
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jun Zhao
- Department of Orthodontics, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhiyuan Zhang
- Department of Oral-maxillofacial Head and Neck Oncology, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dongxia Ye
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Chi Yang
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Shaoyi Wang
- Department of Oral Surgery, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Centre for Oral Diseases, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| |
Collapse
|
27
|
Developmental Roles of FUSE Binding Protein 1 ( Fubp1) in Tooth Morphogenesis. Int J Mol Sci 2020; 21:ijms21218079. [PMID: 33138041 PMCID: PMC7663687 DOI: 10.3390/ijms21218079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/16/2020] [Accepted: 10/27/2020] [Indexed: 12/27/2022] Open
Abstract
FUSE binding protein 1 (Fubp1), a regulator of the c-Myc transcription factor and a DNA/RNA-binding protein, plays important roles in the regulation of gene transcription and cellular physiology. In this study, to reveal the precise developmental function of Fubp1, we examined the detailed expression pattern and developmental function of Fubp1 during tooth morphogenesis by RT-qPCR, in situ hybridization, and knock-down study using in vitro organ cultivation methods. In embryogenesis, Fubp1 is obviously expressed in the enamel organ and condensed mesenchyme, known to be important for proper tooth formation. Knocking down Fubp1 at E14 for two days, showed the altered expression patterns of tooth development related signalling molecules, including Bmps and Fgf4. In addition, transient knock-down of Fubp1 at E14 revealed changes in the localization patterns of c-Myc and cell proliferation in epithelium and mesenchyme, related with altered tooth morphogenesis. These results also showed the decreased amelogenin and dentin sialophosphoprotein expressions and disrupted enamel rod and interrod formation in one- and three-week renal transplanted teeth respectively. Thus, our results suggested that Fubp1 plays a modulating role during dentinogenesis and amelogenesis by regulating the expression pattern of signalling molecules to achieve the proper structural formation of hard tissue matrices and crown morphogenesis in mice molar development.
Collapse
|
28
|
A genotype:phenotype approach to testing taxonomic hypotheses in hominids. Naturwissenschaften 2020; 107:40. [PMID: 32870408 DOI: 10.1007/s00114-020-01696-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 04/20/2020] [Accepted: 08/19/2020] [Indexed: 10/23/2022]
Abstract
Paleontology has long relied on assumptions about the genetic and developmental influences on skeletal variation. The last few decades of developmental genetics have elucidated the genetic pathways involved in making teeth and patterning the dentition. Quantitative genetic analyses have refined this genotype:phenotype map even more, especially for primates. We now have the ability to define dental traits with a fair degree of fidelity to the underlying genetic architecture; for example, the molar module component (MMC) and the premolar-molar module (PMM) that have been defined through quantitative genetic analyses. We leverage an extensive dataset of extant and extinct hominoid dental variation to explore how these two genetically patterned phenotypes have evolved through time. We assess MMC and PMM to test the hypothesis that these two traits reveal a more biologically informed taxonomy at the genus and species levels than do more traditional measurements. Our results indicate that MMC values for hominids fall into two categories and that Homo is derived compared with earlier taxa. We find a more variable, species-level pattern for PMM. These results, in combination with previous research, demonstrate that MMC reflects the phenotypic output of a more evolutionarily stable, or phylogenetically congruent, genetic mechanism, and PMM is a reflection of a more evolutionarily labile mechanism. These results suggest that the human lineage since the split with chimpanzees may not represent as much genus-level variation as has been inferred from traits whose etiologies are not understood.
Collapse
|
29
|
Multiple epithelia are required to develop teeth deep inside the pharynx. Proc Natl Acad Sci U S A 2020; 117:11503-11512. [PMID: 32398375 DOI: 10.1073/pnas.2000279117] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
To explain the evolutionary origin of vertebrate teeth from odontodes, it has been proposed that competent epithelium spread into the oropharyngeal cavity via the mouth and other possible channels such as the gill slits [Huysseune et al., 2009, J. Anat. 214, 465-476]. Whether tooth formation deep inside the pharynx in extant vertebrates continues to require external epithelia has not been addressed so far. Using zebrafish we have previously demonstrated that cells derived from the periderm penetrate the oropharyngeal cavity via the mouth and via the endodermal pouches and connect to periderm-like cells that subsequently cover the entire endoderm-derived pharyngeal epithelium [Rosa et al., 2019, Sci. Rep. 9, 10082]. We now provide conclusive evidence that the epithelial component of pharyngeal teeth in zebrafish (the enamel organ) is derived from medial endoderm, as hitherto assumed based on position deep in the pharynx. Yet, dental morphogenesis starts only after the corresponding endodermal pouch (pouch 6) has made contact with the skin ectoderm, and only after periderm-like cells have covered the prospective tooth-forming endodermal epithelium. Manipulation of signaling pathways shown to adversely affect tooth development indicates they act downstream of these events. We demonstrate that pouch-ectoderm contact and the presence of a periderm-like layer are both required, but not sufficient, for tooth initiation in the pharynx. We conclude that the earliest interactions to generate pharyngeal teeth encompass those between different epithelial populations (skin ectoderm, endoderm, and periderm-like cells in zebrafish), in addition to the epithelial-mesenchymal interactions that govern the formation of all vertebrate teeth.
Collapse
|
30
|
Takahashi M, Ikeda K, Ohmuraya M, Nakagawa Y, Sakuma T, Yamamoto T, Kawakami K. Six1 is required for signaling center formation and labial-lingual asymmetry in developing lower incisors. Dev Dyn 2020; 249:1098-1116. [PMID: 32243674 DOI: 10.1002/dvdy.174] [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: 10/18/2019] [Revised: 03/06/2020] [Accepted: 03/26/2020] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND The structure of the mouse incisor is characterized by its asymmetric accumulation of enamel matrix proteins on the labial side. The asymmetric structure originates from the patterning of the epithelial incisor placode through the interaction with dental mesenchymal cells. However, the molecular basis for the asymmetric patterning of the incisor germ is largely unknown. RESULTS A homeobox transcription factor SIX1 was shown to be produced in the mandibular mesenchyme, and its localization patterns changed dynamically during lower incisor development. Six1-/- mice exhibited smaller lower incisor primordia than wild-type mice. Furthermore, Six1-/- mice showed enamel matrix production on both the lingual and labial sides and disturbed odontoblast maturation. In the earlier stages of development, the formation of signaling centers, the initiation knot and the enamel knot, which are essential for the morphogenesis of tooth germs, were impaired in Six1-/- embryos. Notably, Wnt signaling activity, which shows an anterior-posterior gradient, and the expression patterns of genes involved in incisor formation were altered in the mesenchyme in Six1-/- embryos. CONCLUSION Our results indicate that Six1 is required for signaling center formation in lower incisor germs and the labial-lingual asymmetry of the lower incisors by regulating the anterior-posterior patterning of the mandibular mesenchyme.
Collapse
Affiliation(s)
- Masanori Takahashi
- Division of Biology, Center for Molecular Medicine, Jichi Medical University, Shimotsuke, Tochigi, Japan
| | - Keiko Ikeda
- Department of Physiology, International University of Health and Welfare, Narita, Chiba, Japan
| | - Masaki Ohmuraya
- Department of Genetics, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Yoshiko Nakagawa
- Center for Animal Resources and Development, Kumamoto University, Kumamoto, Kumamoto, Japan
| | - Tetsushi Sakuma
- Division of Integrated Sciences for Life, Graduate School of Integrated Sciences for Life, Hiroshima University, HigashiHiroshima, Hiroshima, Japan
| | - Takashi Yamamoto
- Division of Integrated Sciences for Life, Graduate School of Integrated Sciences for Life, Hiroshima University, HigashiHiroshima, Hiroshima, Japan
| | - Kiyoshi Kawakami
- Division of Biology, Center for Molecular Medicine, Jichi Medical University, Shimotsuke, Tochigi, Japan
| |
Collapse
|
31
|
Thompson VP. The tooth: An analogue for biomimetic materials design and processing. Dent Mater 2020; 36:25-42. [DOI: 10.1016/j.dental.2019.08.106] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 08/21/2019] [Accepted: 08/28/2019] [Indexed: 01/05/2023]
|
32
|
Emulating the early phases of human tooth development in vitro. Sci Rep 2019; 9:7057. [PMID: 31065008 PMCID: PMC6505527 DOI: 10.1038/s41598-019-43468-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/23/2019] [Indexed: 12/31/2022] Open
Abstract
Functional in vitro models emulating the physiological processes of human organ formation are invaluable for future research and the development of regenerative therapies. Here, a developmentally inspired approach is pursued to reproduce fundamental steps of human tooth organogenesis in vitro using human dental pulp cells. Similar to the in vivo situation of tooth initiating mesenchymal condensation, a 3D self-organizing culture was pursued resulting in an organoid of the size of a human tooth germ with odontogenic marker expression. Furthermore, the model is capable of epithelial invagination into the condensed mesenchyme, mimicking the reciprocal tissue interactions of human tooth development. Comprehensive transcriptome analysis revealed activation of well-studied as well as rather less investigated signaling pathways implicated in human tooth organogenesis, such as the Notch signaling. Early condensation in vitro revealed a shift to the TGFß signal transduction pathway and a decreased RhoA small GTPase activity, connected to the remodeling of the cytoskeleton and actin-mediated mechanotransduction. Therefore, this in vitro model of tooth development provides a valuable model to study basic human developmental mechanisms.
Collapse
|
33
|
Wang F, Li G, Wu Z, Fan Z, Yang M, Wu T, Wang J, Zhang C, Wang S. Tracking diphyodont development in miniature pigs in vitro and in vivo. Biol Open 2019; 8:bio.037036. [PMID: 30683673 PMCID: PMC6398454 DOI: 10.1242/bio.037036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Abnormalities of tooth number in humans, such as agenesis and supernumerary tooth formation, are closely related to diphyodont development. There is an increasing demand to understand the molecular and cellular mechanisms behind diphyodont development through the use of large animal models, since they are the most similar to the mechanism of human tooth development. However, attempting to study diphyodont development in large animals remains challenging due to large tooth size, prolonged growth stage and embryo manipulation. Here, we characterized the expression of possible genes for diphyodont development and odontogenesis of an organoid bud from single cells of tooth germs in vitro using Wzhishan pig strain (WZSP). Following this, we used a method of ectopic transplantation of tooth germs at cap stage to dynamically track diphyodont development of tooth germs in mouse subrenal capsules to overcome the restrictions in pig embryos. The results showed that pig tooth germ at cap stage could restore diphyodont development and maintain efficient long-term survival and growth in mouse subrenal capsules, which is suitable for future manipulation of large mammalian tooth development. Our pilot study provided an alternative for studying diphyodont development in large mammals, which will further promote the use of pig as a diphyodont model similar to humans for craniofacial development study. Summary: Little is known about diphyodont development in large animals. Our pilot trial characterized this gene expression and developed an alternative method to track diphyodont development in pigs.
Collapse
Affiliation(s)
- Fu Wang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China.,Department of Basic Oral Sciences, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Guoqing Li
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Zhifang Wu
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Zhipeng Fan
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Min Yang
- Department of Basic Oral Sciences, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Tingting Wu
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Jinsong Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Chunmei Zhang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China
| | - Songlin Wang
- Molecular Laboratory for Gene Therapy & Tooth Regeneration, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing 100050, China .,Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| |
Collapse
|