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Bazina F, Brouxhon SM, Graham UM, Kyrkanides S. Serotonin contributes to the in vitro production of a biomimetic enamel-like material from reprogrammed oral epithelial keratinocytes. Orthod Craniofac Res 2021; 24:494-501. [PMID: 33540478 DOI: 10.1111/ocr.12475] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/08/2021] [Accepted: 01/28/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To evaluate the role of serotonin in the development of a biomimetic enamel-like material in vitro. SETTING AND SAMPLE POPULATION Immortalized murine oral keratinocytes raised from adult mouse mucosa were cultured in vitro. In addition, specimens incorporating molar tooth buds harvested from mice were included in our studies. MATERIALS AND METHODS We used cell-based scaffold-free tissue engineering to assemble three-dimensional (3D) organoids into complex tissue constructs that closely emulate the complexity of adult enamel. We also analysed mouse molar specimens using immunohistochemistry for serotonin expression as well as its cognate receptor. RESULTS TGF-β1-reprogrammed murine oral keratinocytes formed organoids that laid down an amelogenin-rich protein matrix when grown as three-dimensional (3D) cultures in the presence of serotonin. Following mineralization, the newly formed crystals were densified under pressure and vacuum to produce a biomimetic enamel-like material that demonstrated parallel alignment of hydroxyapatite crystals with some interspaced residual organoid matter into enamel prism-like structures conferring size, mechanical properties comparable to tooth enamel, including light translucency. Serotonin expression was localized by immunohistochemistry proximal to the enamel organ of developing molar buds. Moreover, serotonin HTRb2 receptor expression was localized on ameloblasts within the enamel organ proximal to the area where serotonin was immunolocalized. CONCLUSIONS Our results demonstrate that serotonin is inductive in the development of a biomimetic enamel-like material from reprogrammed oral epithelial keratinocytes in vitro. The facileness of harvesting adult somatic cells together with the versatility of our approach offers exciting opportunities to address regenerative challenges linked to lost enamel.
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Affiliation(s)
- Fayrouz Bazina
- Ph.D. Program in Oral Biology and Pathology, School of Dental Medicine, Stony Brook University, Stony Brook, NY, USA
| | - Sabine M Brouxhon
- Department of Physiology, School of Medicine, Stony Brook University, Stony Brook, NY, USA
| | | | - Stephanos Kyrkanides
- Department of Oral Health Science, College of Dentistry, University of Kentucky, Lexington, KY, USA
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Serotonin in stem cell based-dental repair and bone formation: A review. Biochimie 2019; 161:65-72. [DOI: 10.1016/j.biochi.2018.07.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 07/31/2018] [Indexed: 01/08/2023]
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Wang SK, Hu Y, Smith CE, Yang J, Zeng C, Kim JW, Hu JCC, Simmer JP. The Enamel Phenotype in Homozygous Fam83h Truncation Mice. Mol Genet Genomic Med 2019; 7:e724. [PMID: 31060110 PMCID: PMC6565571 DOI: 10.1002/mgg3.724] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 03/14/2019] [Accepted: 04/08/2019] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Truncation FAM83H mutations cause human autosomal dominant hypocalcified amelogenesis imperfecta (ADHCAI), an inherited disorder characterized by severe hardness defects in dental enamel. No enamel defects were observed in Fam83h null mice suggesting that Fam83h truncation mice would better replicate human mutations. METHODS We generated and characterized a mouse model (Fam83hTr/Tr ) expressing a truncated FAM83H protein (amino acids 1-296), which recapitulated the ADHCAI-causing human FAM83H p.Tyr297* mutation. RESULTS Day 14 and 7-week Fam83hTr/Tr molars exhibited rough enamel surfaces and slender cusps resulting from hypoplastic enamel defects. The lateral third of the Fam83hTr/Tr incisor enamel layer was thinner, with surface roughness and altered enamel rod orientation, suggesting disturbed enamel matrix secretion. Regular electron density in mandibular incisor enamel indicated normal enamel maturation. Only mildly increased posteruption attrition of Fam83hTr/Tr molar enamel was observed at 7-weeks. Histologically, the Fam83hTr/Tr enamel organ, including ameloblasts, and enamel matrices at sequential stages of amelogenesis exhibited comparable morphology without overt abnormalities, except irregular and less evident ameloblast Tomes' processes in specific areas. CONCLUSIONS Considering Fam83h-/- mice showed no enamel phenotype, while Fam83hTr/Tr (p.Tyr297*) mice displayed obvious enamel malformations, we conclude that FAM83H truncation mutations causing ADHCAI in humans disturb amelogenesis through a neomorphic mechanism, rather than haploinsufficiency.
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Affiliation(s)
- Shih-Kai Wang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
| | - Yuanyuan Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
| | - Charles E Smith
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan.,Department of Anatomy and Cell Biology, McGill University, Quebec, Canada
| | - Jie Yang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
| | - Chunhua Zeng
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Jan C-C Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
| | - James P Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan
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Baudry A, Alleaume-Butaux A, Dimitrova-Nakov S, Goldberg M, Schneider B, Launay JM, Kellermann O. Essential Roles of Dopamine and Serotonin in Tooth Repair: Functional Interplay Between Odontogenic Stem Cells and Platelets. Stem Cells 2015; 33:2586-95. [PMID: 25865138 DOI: 10.1002/stem.2037] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/06/2015] [Accepted: 03/28/2015] [Indexed: 12/11/2022]
Abstract
Characterizing stem cell intrinsic functions is an ongoing challenge for cell therapies. Here, we report that two independent A4 and H8 stem cell lines isolated from mouse molar pulp display the overall functions of bioaminergic cells. Both clones produce neurotrophins and synthesize, catabolize, store, and transport serotonin (5-hydroxytryptamine [5-HT]) and dopamine (DA). They express 5-HT1D,2B,7 and D1,3 autoreceptors, which render pulpal stem cells competent to respond to circulating 5-HT and DA. We show that injury-activated platelets are the source of systemic 5-HT and DA necessary for dental repair since natural dentin reparation is impaired in two rat models with monoamine storage-deficient blood platelets. Moreover, selective inhibition of either D1, D3, 5-HT2B, or 5-HT7 receptor within the pulp of wild-type rat molars after lesion alters the reparative process. Altogether our data argue that 5-HT and DA coreleased by pulp injury-activated platelets are critical for stem cell-mediated dental repair through 5-HT and DA receptor signalings.
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Affiliation(s)
- Anne Baudry
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Aurélie Alleaume-Butaux
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Sasha Dimitrova-Nakov
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Michel Goldberg
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Benoît Schneider
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
| | - Jean-Marie Launay
- AP-HP, Service de Biochimie, Hôpital Lariboisière, Paris, France.,INSERM U942, Hôpital Lariboisière, Paris, France.,Pharma Research Department, F. Hoffmann-La-Roche, Ltd, Basel, Switzerland
| | - Odile Kellermann
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124, Paris, France
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Goldberg M, Kellermann O, Dimitrova-Nakov S, Harichane Y, Baudry A. Comparative studies between mice molars and incisors are required to draw an overview of enamel structural complexity. Front Physiol 2014; 5:359. [PMID: 25285079 PMCID: PMC4168675 DOI: 10.3389/fphys.2014.00359] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 09/02/2014] [Indexed: 01/11/2023] Open
Abstract
In the field of dentistry, the murine incisor has long been considered as an outstanding model to study amelogenesis. However, it clearly appears that enamel from wild type mouse incisors and molars presents several structural differences. In incisor, exclusively radial enamel is observed. In molars, enamel displays a high level of complexity since the inner part is lamellar whereas the outer enamel shows radial and tangential structures. Recently, the serotonin 2B receptor (5-HT2BR) was shown to be involved in ameloblast function and enamel mineralization. The incisors from 5HT2BR knockout (KO) mice exhibit mineralization defects mostly in the outer maturation zone and porous matrix network in the inner zone. In the molars, the mutation affects both secretory and maturation stages of amelogenesis since pronounced alterations concern overall enamel structures. Molars from 5HT2BR KO mice display reduction in enamel thickness, alterations of inner enamel architecture including defects in Hunter-Schreger Bands arrangements, and altered maturation of the outer radial enamel. Differences of enamel structure were also observed between incisor and molar from other KO mice depleted for genes encoding enamel extracellular matrix proteins. Thus, upon mutation, enamel analysis based exclusively on incisor defects would be biased. In view of the functional relationship between enamel structure and tooth morphogenesis, identification of molecular actors involved in amelogenesis requires comparative studies between mice molars and incisors.
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Affiliation(s)
- Michel Goldberg
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions Paris, France ; Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124 Paris, France
| | - O Kellermann
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions Paris, France ; Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124 Paris, France
| | - S Dimitrova-Nakov
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions Paris, France ; Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124 Paris, France
| | - Y Harichane
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions Paris, France ; Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124 Paris, France
| | - A Baudry
- INSERM UMR-S 1124, Cellules Souches, Signalisation et Prions Paris, France ; Université Paris Descartes, Sorbonne Paris Cité, UMR-S 1124 Paris, France
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Dimitrova-Nakov S, Baudry A, Harichane Y, Collet C, Marchadier A, Kellermann O, Goldberg M. Deletion of serotonin 2B receptor provokes structural alterations of mouse dental tissues. Calcif Tissue Int 2014; 94:293-300. [PMID: 24170303 DOI: 10.1007/s00223-013-9810-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 10/01/2013] [Indexed: 11/25/2022]
Abstract
Rampant caries and periodontal diseases occur in patients treated with antidepressants such as serotonin reuptake inhibitors (SRIs; e.g., Prozac) which target the serotonin transporter (SERT). As the serotonin 2B receptor (5HT2BR) regulates SERT functionality and capacity to recognize SRIs, we investigated the potential role of 5HT2BR on dental tissues by exploiting 5HT2BR knockout (KO) mice. Compared to wild-type (WT) mice, several structural differences were identified in the teeth of KO mice. In the molar of KO mice, rod curvatures and twisting were altered compared to WT mice, suggesting involvement of 5HT2BR at early stages of enamel formation. The volume of the KO enamel layer was also reduced, and larger porosities were observed in the prismatic enamel, with smaller crystallite thickness. Crystallite pattern disorganization and occlusal abrasion were enhanced in female KO mice, indicating a sexual dimorphism. In the incisor, no difference was detected in the width of the enamel layer between KO and WT mice; however, enamel maturation differed in absence of 5HT2BR. Specifically, the outer aprismatic enamel border was 1.5- to 2-fold larger in KO compared to WT mice, together with a decreased etching pattern. Finally, although no noticeable difference was observed in dentin, the micro-CT three-dimensional pulp reconstruction evidenced a decrease in both length and width of dentin formation in the root canals of the KO versus WT mice. These data provide evidence that 5HT2BR-mediated signaling pathways are involved in enamel formation and dentinogenesis.
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Affiliation(s)
- Sasha Dimitrova-Nakov
- Cellules souches, Signalisation et Prions, INSERM UMR-S 747, Université Paris Descartes Sorbonne, Paris Cité, Biomédicale des Saints Pères, 45 rue des Saints Pères, 75006, Paris, France
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TGF-ß regulates enamel mineralization and maturation through KLK4 expression. PLoS One 2013; 8:e82267. [PMID: 24278477 PMCID: PMC3835418 DOI: 10.1371/journal.pone.0082267] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 10/31/2013] [Indexed: 02/05/2023] Open
Abstract
Transforming growth factor-ß (TGF-ß) signaling plays an important role in regulating crucial biological processes such as cell proliferation, differentiation, apoptosis, and extracellular matrix remodeling. Many of these processes are also an integral part of amelogenesis. In order to delineate a precise role of TGF-ß signaling during amelogenesis, we developed a transgenic mouse line that harbors bovine amelogenin promoter-driven Cre recombinase, and bred this line with TGF-ß receptor II floxed mice to generate ameloblast-specific TGF-ß receptor II conditional knockout (cKO) mice. Histological analysis of the teeth at postnatal day 7 (P7) showed altered enamel matrix composition in the cKO mice as compared to the floxed mice that had enamel similar to the wild-type mice. The µCT and SEM analyses revealed decreased mineral content in the cKO enamel concomitant with increased attrition and thinner enamel crystallites. Although the mRNA levels remained unaltered, immunostaining revealed increased amelogenin, ameloblastin, and enamelin localization in the cKO enamel at the maturation stage. Interestingly, KLK4 mRNA levels were significantly reduced in the cKO teeth along with a slight increase in MMP-20 levels, suggesting that normal enamel maturation is regulated by TGF-ß signaling through the expression of KLK4. Thus, our study indicates that TGF-ß signaling plays an important role in ameloblast functions and enamel maturation.
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