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Renostro-Souza A, Fonseca-Souza G, Küchler EC, Vasconcelos KRF, Feltrin-Souza J, Kirschneck C, Matsumoto MAN, Lepri CP, Oliveira MAHDM, Thedei G. Association of defects of enamel with polymorphisms in the vitamin D receptor and parathyroid hormone genes. Braz Dent J 2024; 35:e245900. [PMID: 38922252 PMCID: PMC11196029 DOI: 10.1590/0103-6440202405900] [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: 01/15/2024] [Accepted: 02/28/2024] [Indexed: 06/27/2024] Open
Abstract
This cross-sectional study aimed to investigate the association between developmental defects of enamel (DDE) and single nucleotide polymorphisms (SNPs) in the genes encoding the vitamin D receptor (VDR) and parathyroid hormone (PTH). Orthodontic patients receiving treatment at a dental school were selected through convenience sampling. Intra-oral photographs were used to assess DDE, which were classified according to the criteria proposed by Ghanim et al. (2015) by a single calibrated examiner (Kappa>0.80). Enamel hypoplasia, molar-incisor hypomineralization (MIH), hypomimineralized second primary molar (HSPM), and non-MIH/HSPM demarcated opacities were considered for the analysis. Genomic DNA was extracted from buccal cells. The SNPs in VDR (rs7975232) and PHT (rs694, rs6256, and rs307247) were genotyped using real-time polymerase chain reactions (PCR). Statistical analyses were performed using the PLINK software (version 1.03, designed by Shaun Purcell, EUA). Chi-square or Fisher's exact tests were performed at a significance level of 5%. Ninety-one (n=91) patients (49 females and 42 males) (mean age of 14.1±5.8 years) were included. The frequency of DDE was 38.5% (35 patients). Genotype distributions were in Hardy-Weinberg equilibrium. No significant statistical association was found between DDE and the SNPs evaluated. A borderline association (p=0.09) was observed between DDE and the CC haplotype for SNP rs7975232 in VDR. In conclusion, the selected SNPs in VDR and PTH genes were not associated with DDE in the studied samples.
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Affiliation(s)
| | | | | | | | | | | | - Mírian Aiko Nakane Matsumoto
- Department of Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | | | - Geraldo Thedei
- Department of Biomaterials, University of Uberaba, Uberaba, MG, Brazil
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2
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Van Ankum EM, Majcher KB, Dolovich AT, Johnston JD, Flegel KP, Boughner JC. Food texture and vitamin D influence mouse mandible form and molar roots. Anat Rec (Hoboken) 2024; 307:611-632. [PMID: 37702738 DOI: 10.1002/ar.25315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 09/14/2023]
Abstract
Industrialization influenced several facets of lifestyle, including softer nutrient-poor diets that contributed to vitamin D deficiency in post-industrzialized populations, with concomitantly increased dental problems. Here we simulated a post-industrialized diet in a mouse model to test the effects of diet texture and vitamin D level on mandible and third molar (M3) forms. Mice were raised on a soft diet with vitamin D (VitD) or without it (NoD), or on a hard diet with vitamin D. We hypothesized that a VitD/hard diet is optimal for normal mandible and tooth root form, as well as for timely M3 initiation. Subsets of adult NoD/soft and VitD/soft groups were bred to produce embryos that were micro-computed tomography (μCT) scanned to stage M3 development. M3 stage did not differ between embryos from mothers fed VitD and NoD diets, indicating that vitamin D does not affect timing of M3 onset. Sacrificed adult mice were μCT-scanned, their mandibles 3D-landmarked and M3 roots were measured. Principal component (PC) analysis described the largest proportion of mandible shape variance (PC1, 30.1%) related to diet texture, and nominal shape variance (PC2, 13.8%) related to vitamin D. Mice fed a soft diet had shorter, relatively narrower, and somewhat differently shaped mandibles that recapitulated findings in human populations. ANOVA and other multivariate tests found significantly wider M3 roots and larger root canals in mice fed a soft diet, with vitamin D having little effect. Altogether our experiments using a mouse model contribute new insights about how a post-industrial diet may influence human craniodental variation.
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Affiliation(s)
- Elsa M Van Ankum
- Department of Anatomy, Physiology & Pharmacology, University of Saskatchewan, Saskatoon, Canada
| | - Kadin B Majcher
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada
| | - Allan T Dolovich
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada
| | - James D Johnston
- Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada
| | - Kennedy P Flegel
- Department of Anatomy, Physiology & Pharmacology, University of Saskatchewan, Saskatoon, Canada
| | - Julia C Boughner
- Department of Anatomy, Physiology & Pharmacology, University of Saskatchewan, Saskatoon, Canada
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3
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Ruspita I, Das P, Miyoshi K, Noma T, Snead ML, Bei M. Enam expression is regulated by Msx2. Dev Dyn 2023; 252:1292-1302. [PMID: 37191055 PMCID: PMC10592542 DOI: 10.1002/dvdy.598] [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: 02/03/2023] [Revised: 03/30/2023] [Accepted: 04/12/2023] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND The precise formation of mineralized dental tissues such as enamel and/or dentin require tight transcriptional control of the secretion of matrix proteins. Here, we have investigated the transcriptional regulation of the second most prominent enamel matrix protein, enamelin, and its regulation through the major odontogenic transcription factor, MSX2. RESULTS Using in vitro and in vivo approaches, we identified that (a) Enam expression is reduced in the Msx2 mouse mutant pre-secretory and secretory ameloblasts, (b) Enam is an early response gene whose expression is under the control of Msx2, (c) Msx2 binds to Enam promoter in vitro, suggesting that enam is a direct target for Msx2 and that (d) Msx2 alone represses Enam gene expression. CONCLUSIONS Collectively, these results illustrate that Enam gene expression is controlled by Msx2 in a spatio-temporal manner. They also suggest that Msx2 may interact with other transcription factors to control spatial and temporal expression of Enam and hence amelogenesis and enamel biomineralization.
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Affiliation(s)
- Intan Ruspita
- Center for Regenerative and Developmental Biology, The Forsyth Institute, Cambridge, MA, USA
- Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Pragnya Das
- Center for Regenerative and Developmental Biology, The Forsyth Institute, Cambridge, MA, USA
- Cooper University Hospital, Camden, NJ, USA
| | - Keiko Miyoshi
- Department of Molecular Biology, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Takafumi Noma
- Faculty of Human Life Studies, Hiroshima Jogakuin University, Hiroshima, Japan
| | - Malcolm L. Snead
- Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry of USC, University of Southern California, LA, CA
| | - Marianna Bei
- Center for Engineering in Medicine and Surgery, Department of Surgery, Massachusetts General Hospital, Boston MA, USA
- Department of Surgery, Harvard Medical School, Boston MA, USA
- Shriners Hospital for Children, Boston, MA
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Marañón-Vásquez G, Küchler EC, Hermann S, Paddenberg E, Schröder A, Baratto-Filho F, Flores-Mir C, Proff P, Kirschneck C. Association between genetic variants in key vitamin-D-pathway genes and external apical root resorption linked to orthodontic treatment. Eur J Oral Sci 2023; 131:e12916. [PMID: 36683003 DOI: 10.1111/eos.12916] [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: 05/24/2022] [Accepted: 12/31/2022] [Indexed: 01/24/2023]
Abstract
This study evaluated the association between single-nucleotide polymorphisms (SNPs) in vitamin-D-related genes and the amount of external apical root resorption linked to orthodontic treatment. One hundred and forty-three individuals were assessed. The amount of external apical root resorption of upper central incisors (EARRinc ) and lower first molars (EARRmol ) were evaluated in radiographs. Seven SNPs were genotyped across four genes including the vitamin D receptor [VDR], group-specific component [GC], cytochrome P450 family 27 subfamily B member 1 [CYP27B1], and cytochrome P450 family 24 subfamily A member 1 [CYP24A1]. Linear regressions were implemented to determine allele-effects on external apical root resorption. Individuals carrying the AA genotype in VDR rs2228570 had a 21% higher EARRmol than those having AG and GG genotypes (95% CI: 1.03,1.40). EARRmol in heterozygous rs2228570, was 12% lower than for homozygotes (95%CI: 0.78,0.99). Participants with the CCG haplotype (rs1544410-rs7975232-rs731236) in VDR had an EARRmol 16% lower than those who did not carry this haplotype. Regarding CYP27B1 rs4646536, EARRinc in participants who had at least one G allele was 42% lower than for homozygotes AA (95%CI: 0.37,0.93). Although these results did not remain significant after multiple testing adjustment, potential associations may still be suggested. Further replication studies are needed to confirm or refute these findings.
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Affiliation(s)
- G Marañón-Vásquez
- Department of Pediatric Dentistry, and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - E C Küchler
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
| | - S Hermann
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
| | - E Paddenberg
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
| | - A Schröder
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
| | - F Baratto-Filho
- Department of Dentistry, School of Dentistry, Univille - University of the Joinville Region, Joinville, Santa Catarina, Brazil
| | - C Flores-Mir
- Division of Orthodontics, School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - P Proff
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
| | - C Kirschneck
- Department of Orthodontics, University Medical Centre of Regensburg, Regensburg, Germany
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刘 建, 王 宪, 吕 达, 乔 敏, 张 立, 孟 焕, 徐 莉, 毛 铭. [Association between root abnormalities and related pathogenic genes in patients with generalized aggressive periodontitis]. BEIJING DA XUE XUE BAO. YI XUE BAN = JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2020; 53:16-23. [PMID: 33550331 PMCID: PMC7867985 DOI: 10.19723/j.issn.1671-167x.2021.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Indexed: 06/12/2023]
Abstract
OBJECTIVE To explore the association between the abnormal root morphology and bone metabolism or root development related gene polymorphism in patients with generalized aggressive periodontitis. METHODS In the study, 179 patients with generalized aggressive periodontitis were enrolled, with an average age of (27.23±5.19) years, male / female = 67/112. The average number of teeth remaining in the mouth was (26.80±1.84). Thirteen single nucleotide polymorphisms (SNPs) of nine genes which related to bone metabolism and root development were detected by matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS). Root abnormalities were identified using periapical radiographs. The abnormal root morphology included cone-rooted teeth, slender-root teeth, short-rooted teeth, curved-rooted teeth, syncretic-rooted molars, and molar root abnormalities. The number of teeth and incidence of abnormal root morphology in different genotypes of 13 SNPs were analyzed. RESULTS The constituent ratio of root with root abnormality in GAgP patients was 14.49%(695/4 798). The average number of teeth with abnormal root morphology in GAgP was (3.88±3.84). The average number of teeth with abnormal root morphology in CC, CT and TT genotypes in vitamin D receptor (VDR) rs2228570 was (4.66±4.10), (3.71±3.93) and (2.68±2.68). There was significant difference between TT genotype and CC genotype (t = 2.62, P =0.01). The average number of root morphological abnormalities in CC, CT and TT genotypes of Calcitotin Receptor (CTR) gene rs2283002 was (5.02±3.70), (3.43±3.95), and (3.05±3.12). The incidence of root morphological abnormalities in CC genotype was higher than that in the patients with CT and TT, and the difference was statistically significant(87.86% vs. 65.26% & 63.64%, P=0.006, adjusted OR =3.71, 95%CI: 1.45-9.50). There was no significant difference in the incidence of abnormal root morphology between CT and TT genotypes. CONCLUSION VDR rs2228570 and CTR rs2283002 may be associated with the occurrence of abnormal root morphology in patients with generalized aggressive periodontitis, which is worthy of further research.
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Affiliation(s)
- 建 刘
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 宪娥 王
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 达 吕
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 敏 乔
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 立 张
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 焕新 孟
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 莉 徐
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - 铭馨 毛
- />北京大学口腔医学院·口腔医院,牙周科 国家口腔疾病临床医学研究中心 口腔数字化医疗技术和材料国家工程实验室 口腔数字医学北京市重点实验室,北京 100081Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
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Fatturi AL, Menoncin BL, Reyes MT, Meger M, Scariot R, Brancher JA, Küchler EC, Feltrin-Souza J. The relationship between molar incisor hypomineralization, dental caries, socioeconomic factors, and polymorphisms in the vitamin D receptor gene: a population-based study. Clin Oral Investig 2020; 24:3971-3980. [PMID: 32236726 DOI: 10.1007/s00784-020-03263-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 03/13/2020] [Indexed: 01/13/2023]
Abstract
OBJECTIVES The purpose of this cross-sectional study was to investigate whether polymorphisms in vitamin D receptor (VDR) genes increase the prevalence of dental caries, molar incisor hypomineralization (MIH), and hypomineralized primary second molars (HPSM). MATERIAL AND METHODS A representative population-based sample of 731 schoolchildren, 8 years of age, was randomly selected in Curitiba, Paraná, Brazil. MIH, HPSM, and dental caries were clinically assessed by four calibrated examiners (kappa > 0.80) using European Academy of Pediatric Dentistry (2003) criteria, the modified Developmental Defects of Enamel (DDE) index, and the Decayed, Missing, or Filled Teeth (DMFT) index by the World Health Organization (2013), respectively. The VDR rs739837 and rs2228570 polymorphisms were genotyped using real-time polymerase chain reaction. Associations were analyzed by Poisson regression with robust variance (α = 0.05). RESULTS Schoolchildren with MIH presented a higher prevalence of dental caries (DMFT > 1, PR = 2.52, confidence interval = 1.60-3.97, p ≤ 0.001). No association was observed between MIH, HPSM, and dental caries, with rs739837 and rs2228570 polymorphisms. Individuals with the GT/GG genotype in rs739837 polymorphism presented a higher prevalence of MIH in molars and incisors than individuals TT (PR = 2.34, confidence interval = 1.08-5.07, p = 0.03). CONCLUSION Children with MIH presented a significant higher prevalence of dental caries than children without MIH. To carry at least one G allele in rs739837 was associated to higher prevalence of MIH in molars and incisors. CLINICAL RELEVANCE Our findings suggested that more severe cases with incisors affected by MIH could be associated with polymorphism in VDR gene.
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Affiliation(s)
- Aluhê Lopes Fatturi
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, PR, Brazil.,School of Dentistry, Guairaca College, Guarapuava, PR, Brazil
| | | | | | - Michelle Meger
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - Rafaela Scariot
- Department of Stomatology, Universidade Federal do Paraná, Curitiba, PR, Brazil.,School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - João Armando Brancher
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
| | - Erika Calvano Küchler
- School of Health and Biological Sciences, Universidade Positivo, Curitiba, PR, Brazil
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Nørrisgaard PE, Haubek D, Kühnisch J, Chawes BL, Stokholm J, Bønnelykke K, Bisgaard H. Association of High-Dose Vitamin D Supplementation During Pregnancy With the Risk of Enamel Defects in Offspring: A 6-Year Follow-up of a Randomized Clinical Trial. JAMA Pediatr 2019; 173:924-930. [PMID: 31381020 PMCID: PMC6686764 DOI: 10.1001/jamapediatrics.2019.2545] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
IMPORTANCE Enamel defects of developmental origin affect up to 38% of schoolchildren and is recognized as a global public health challenge. The impaired enamel formation results in pain owing to hypersensitivity, posteruptive breakdowns, rapid caries progression, and extractions in some cases. The etiology is unknown; therefore, prevention is currently not possible. OBJECTIVE To assess the association of a high-dose vitamin D supplementation in pregnant women with enamel defects and caries in their offspring. DESIGN, SETTING, AND PARTICIPANTS Post hoc analysis of a double-blind, single-center, randomized clinical trial, the Copenhagen Prospective Studies on Asthma in Childhood 2010 cohort (COPSAC2010). Enrollment began March 2009 and included 623 women recruited at 24 weeks of pregnancy and 588 of their children. A dental examination was completed at age 6 years in 496 of 588 children (84%). Data were analyzed in 2018. INTERVENTION High-dose vitamin D3 (2400 IU/d; N = 315) or matching placebo tablets (N = 308) from pregnancy week 24 to 1 week post partum. In addition, all women received 400 IU/d of vitamin D3 as part of standard care. MAIN OUTCOMES AND MEASURES Enamel defect was defined as having at least 1 molar affected by demarcated opacity, enamel breakdown, and/or atypical restoration. Caries was defined as decayed, missing, or filled surfaces in both the deciduous and permanent dentitions (World Health Organization standard). RESULTS The risk of enamel defects in the permanent dentition was lower in the offspring of mothers who received high-dose vitamin D supplementation during pregnancy compared with standard dose (15.1% [n = 26 of 172] vs 27.5% [n = 44 of 160]; odds ratio, 0.47; 95% CI, 0.27-0.81). A similar association was observed for the deciduous dentition (8.6% [n = 21 of 244] vs 15.9% [n = 40 of 252]; odds ratio, 0.50; 95% CI, 0.28-0.87). There was no association between supplementation and caries. CONCLUSIONS AND RELEVANCE High-dose vitamin D supplementation during pregnancy was associated with approximately 50% reduced odds of enamel defects in the offspring. This suggests prenatal vitamin D supplementation as a preventive intervention for enamel defects, with a clinically important association with dental health. TRIAL REGISTRATION ClinicalTrials.gov identifier: NCT00856947.
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Affiliation(s)
- Pia Elisabeth Nørrisgaard
- Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Gentofte, Denmark
| | - Dorte Haubek
- Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Jan Kühnisch
- Department of Operative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-Universität München, München, Germany
| | - Bo Lund Chawes
- Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Gentofte, Denmark
| | - Jakob Stokholm
- Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Gentofte, Denmark,Department of Pediatrics, Naestved Hospital, Naestved, Denmark
| | - Klaus Bønnelykke
- Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Gentofte, Denmark
| | - Hans Bisgaard
- Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Gentofte, Denmark
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8
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Yang L, Dong Y, Luo W, Zhu T, Li Q, Zhang L, Kong J, Yuan Z, Zhao Q. Calbindin‐D28K mediates 25(OH)D3/VDR‐regulated bone formation through MMP13 and DMP1. J Cell Biochem 2018; 119:8035-8047. [PMID: 29377305 DOI: 10.1002/jcb.26722] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 01/24/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Li‐Ping Yang
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Ya‐Ping Dong
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Wen‐Ting Luo
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Tong Zhu
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Qi‐Wei Li
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Li‐Jun Zhang
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Juan Kong
- Department of Clinical NutritionShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Zheng‐Wei Yuan
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
| | - Qun Zhao
- Department of Pediatric OrthopedicShengjing Hospital of China Medical UniversityShenyangLiaoningChina
- Key Laboratory of Congenital MalformationMinistry of HealthShengjing Hospital of China Medical UniversityShenyangLiaoningChina
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9
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Eckstein M, Aulestia FJ, Nurbaeva MK, Lacruz RS. Altered Ca 2+ signaling in enamelopathies. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2018; 1865:1778-1785. [PMID: 29750989 DOI: 10.1016/j.bbamcr.2018.04.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/26/2018] [Accepted: 04/30/2018] [Indexed: 10/16/2022]
Abstract
Biomineralization requires the controlled movement of ions across cell barriers to reach the sites of crystal growth. Mineral precipitation occurs in aqueous phases as fluids become supersaturated with specific ionic compositions. In the biological world, biomineralization is dominated by the presence of calcium (Ca2+) in crystal lattices. Ca2+ channels are intrinsic modulators of this process, facilitating the availability of Ca2+ within cells in a tightly regulated manner in time and space. Unequivocally, the most mineralized tissue produced by vertebrates, past and present, is dental enamel. With some of the longest carbonated hydroxyapatite (Hap) crystals known, dental enamel formation is fully coordinated by specialized epithelial cells of ectodermal origin known as ameloblasts. These cells form enamel in two main developmental stages: a) secretory; and b) maturation. The secretory stage is marked by volumetric growth of the tissue with limited mineralization, and the opposite is found in the maturation stage, as enamel crystals expand in width concomitant with increased ion transport. Disruptions in the formation and/or mineralization stages result, in most cases, in permanent alterations in the crystal assembly. This introduces weaknesses in the material properties affecting enamel's hardness and durability, thus limiting its efficacy as a biting, chewing tool and increasing the possibility of pathology. Here, we briefly review enamel development and discuss key properties of ameloblasts and their Ca2+-handling machinery, and how alterations in this toolkit result in enamelopathies.
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Affiliation(s)
- Miriam Eckstein
- Department of Basic Science and Craniofacial Biology, New York University College of Dentistry, New York, United States
| | - Francisco J Aulestia
- Department of Basic Science and Craniofacial Biology, New York University College of Dentistry, New York, United States
| | - Meerim K Nurbaeva
- Department of Basic Science and Craniofacial Biology, New York University College of Dentistry, New York, United States
| | - Rodrigo S Lacruz
- Department of Basic Science and Craniofacial Biology, New York University College of Dentistry, New York, United States.
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Lacruz RS, Habelitz S, Wright JT, Paine ML. DENTAL ENAMEL FORMATION AND IMPLICATIONS FOR ORAL HEALTH AND DISEASE. Physiol Rev 2017; 97:939-993. [PMID: 28468833 DOI: 10.1152/physrev.00030.2016] [Citation(s) in RCA: 223] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 01/10/2017] [Accepted: 01/10/2017] [Indexed: 12/16/2022] Open
Abstract
Dental enamel is the hardest and most mineralized tissue in extinct and extant vertebrate species and provides maximum durability that allows teeth to function as weapons and/or tools as well as for food processing. Enamel development and mineralization is an intricate process tightly regulated by cells of the enamel organ called ameloblasts. These heavily polarized cells form a monolayer around the developing enamel tissue and move as a single forming front in specified directions as they lay down a proteinaceous matrix that serves as a template for crystal growth. Ameloblasts maintain intercellular connections creating a semi-permeable barrier that at one end (basal/proximal) receives nutrients and ions from blood vessels, and at the opposite end (secretory/apical/distal) forms extracellular crystals within specified pH conditions. In this unique environment, ameloblasts orchestrate crystal growth via multiple cellular activities including modulating the transport of minerals and ions, pH regulation, proteolysis, and endocytosis. In many vertebrates, the bulk of the enamel tissue volume is first formed and subsequently mineralized by these same cells as they retransform their morphology and function. Cell death by apoptosis and regression are the fates of many ameloblasts following enamel maturation, and what cells remain of the enamel organ are shed during tooth eruption, or are incorporated into the tooth's epithelial attachment to the oral gingiva. In this review, we examine key aspects of dental enamel formation, from its developmental genesis to the ever-increasing wealth of data on the mechanisms mediating ionic transport, as well as the clinical outcomes resulting from abnormal ameloblast function.
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Affiliation(s)
- Rodrigo S Lacruz
- Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, New York, New York; Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California; Department of Pediatric Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina; Herman Ostrow School of Dentistry, Center for Craniofacial Molecular Biology, University of Southern California, Los Angeles, California
| | - Stefan Habelitz
- Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, New York, New York; Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California; Department of Pediatric Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina; Herman Ostrow School of Dentistry, Center for Craniofacial Molecular Biology, University of Southern California, Los Angeles, California
| | - J Timothy Wright
- Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, New York, New York; Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California; Department of Pediatric Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina; Herman Ostrow School of Dentistry, Center for Craniofacial Molecular Biology, University of Southern California, Los Angeles, California
| | - Michael L Paine
- Department of Basic Science and Craniofacial Biology, College of Dentistry, New York University, New York, New York; Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California; Department of Pediatric Dentistry, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina; Herman Ostrow School of Dentistry, Center for Craniofacial Molecular Biology, University of Southern California, Los Angeles, California
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11
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Babajko S, Jedeon K, Houari S, Loiodice S, Berdal A. Disruption of Steroid Axis, a New Paradigm for Molar Incisor Hypomineralization (MIH). Front Physiol 2017; 8:343. [PMID: 28603502 PMCID: PMC5445125 DOI: 10.3389/fphys.2017.00343] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/10/2017] [Indexed: 01/22/2023] Open
Affiliation(s)
- Sylvie Babajko
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, University Paris-Descartes, University Pierre et Marie Curie-ParisParis, France.,Unité de Formation et de Recherche en Odontologie, University Paris-DiderotParis, France
| | - Katia Jedeon
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, University Paris-Descartes, University Pierre et Marie Curie-ParisParis, France.,Unité de Formation et de Recherche en Odontologie, University Paris-DiderotParis, France
| | - Sophia Houari
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, University Paris-Descartes, University Pierre et Marie Curie-ParisParis, France.,Unité de Formation et de Recherche en Odontologie, University Paris-DiderotParis, France
| | - Sophia Loiodice
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, University Paris-Descartes, University Pierre et Marie Curie-ParisParis, France.,Unité de Formation et de Recherche en Odontologie, University Paris-DiderotParis, France
| | - Ariane Berdal
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, University Paris-Descartes, University Pierre et Marie Curie-ParisParis, France.,Unité de Formation et de Recherche en Odontologie, University Paris-DiderotParis, France.,Centre de Référence des Maladies Rares de la face et de la Cavité Buccale MAFACE, Rothschild HospitalParis, France
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12
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Nurbaeva MK, Eckstein M, Feske S, Lacruz RS. Ca 2+ transport and signalling in enamel cells. J Physiol 2017; 595:3015-3039. [PMID: 27510811 PMCID: PMC5430215 DOI: 10.1113/jp272775] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/21/2016] [Indexed: 01/02/2023] Open
Abstract
Dental enamel is one of the most remarkable examples of matrix-mediated biomineralization. Enamel crystals form de novo in a rich extracellular environment in a stage-dependent manner producing complex microstructural patterns that are visually stunning. This process is orchestrated by specialized epithelial cells known as ameloblasts which themselves undergo striking morphological changes, switching function from a secretory role to a cell primarily engaged in ionic transport. Ameloblasts are supported by a host of cell types which combined represent the enamel organ. Fully mineralized enamel is the hardest tissue found in vertebrates owing its properties partly to the unique mixture of ionic species represented and their highly organized assembly in the crystal lattice. Among the main elements found in enamel, Ca2+ is the most abundant ion, yet how ameloblasts modulate Ca2+ dynamics remains poorly known. This review describes previously proposed models for passive and active Ca2+ transport, the intracellular Ca2+ buffering systems expressed in ameloblasts and provides an up-dated view of current models concerning Ca2+ influx and extrusion mechanisms, where most of the recent advances have been made. We also advance a new model for Ca2+ transport by the enamel organ.
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Affiliation(s)
- Meerim K. Nurbaeva
- Department of Basic Science and Craniofacial BiologyNew York University College of DentistryNew YorkUSA
| | - Miriam Eckstein
- Department of Basic Science and Craniofacial BiologyNew York University College of DentistryNew YorkUSA
| | - Stefan Feske
- Department of PathologyNew York University School of MedicineNew YorkNY10016USA
| | - Rodrigo S. Lacruz
- Department of Basic Science and Craniofacial BiologyNew York University College of DentistryNew YorkUSA
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13
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Houari S, Loiodice S, Jedeon K, Berdal A, Babajko S. Expression of Steroid Receptors in Ameloblasts during Amelogenesis in Rat Incisors. Front Physiol 2016; 7:503. [PMID: 27853434 PMCID: PMC5090168 DOI: 10.3389/fphys.2016.00503] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/13/2016] [Indexed: 12/02/2022] Open
Abstract
Endocrine disrupting chemicals (EDCs) play a part in the modern burst of diseases and interfere with the steroid hormone axis. Bisphenol A (BPA), one of the most active and widely used EDCs, affects ameloblast functions, leading to an enamel hypomineralization pattern similar to that of Molar Incisor Hypomineralization (MIH). In order to explore the molecular pathways stimulated by BPA during amelogenesis, we thoroughly investigated the receptors known to directly or indirectly mediate the effects of BPA. The expression patterns of high affinity BPA receptors (ERRγ, GPR30), of ketosteroid receptors (ERs, AR, PGR, GR, MR), of the retinoid receptor RXRα, and PPARγ were established using RT-qPCR analysis of RNAs extracted from microdissected enamel organ of adult rats. Their expression was dependent on the stage of ameloblast differentiation, except that of ERβ and PPARγ which remained undetectable. An additional large scale microarray analysis revealed three main groups of receptors according to their level of expression in maturation-stage ameloblasts. The expression level of RXRα was the highest, similar to the vitamin D receptor (VDR), whereas the others were 13 to 612-fold lower, with AR and GR being intermediate. Immunofluorescent analysis of VDR, ERα and AR confirmed their presence mainly in maturation- stage ameloblasts. These data provide further evidence that ameloblasts express a specific combination of hormonal receptors depending on their developmental stage. This study represents the first step toward understanding dental endocrinology as well as some of the effects of EDCs on the pathophysiology of amelogenesis.
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Affiliation(s)
- Sophia Houari
- Paris Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, Université Paris-Descartes, Université Pierre et Marie Curie-ParisParis, France; Université Paris-Diderot, Unité de Formation et de Recherche d'OdontologieParis, France
| | - Sophia Loiodice
- Paris Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, Université Paris-Descartes, Université Pierre et Marie Curie-ParisParis, France; Université Paris-Diderot, Unité de Formation et de Recherche d'OdontologieParis, France
| | - Katia Jedeon
- Paris Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, Université Paris-Descartes, Université Pierre et Marie Curie-ParisParis, France; Université Paris-Diderot, Unité de Formation et de Recherche d'OdontologieParis, France
| | - Ariane Berdal
- Paris Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, Université Paris-Descartes, Université Pierre et Marie Curie-ParisParis, France; Université Paris-Diderot, Unité de Formation et de Recherche d'OdontologieParis, France; Centre de Référence des maladies rares de la face et de la cavité buccale MAFACE hôpital Rothschild, AP-HPParis, France
| | - Sylvie Babajko
- Paris Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale UMRS 1138, Université Paris-Descartes, Université Pierre et Marie Curie-ParisParis, France; Université Paris-Diderot, Unité de Formation et de Recherche d'OdontologieParis, France
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14
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Dental enamel cells express functional SOCE channels. Sci Rep 2015; 5:15803. [PMID: 26515404 PMCID: PMC4626795 DOI: 10.1038/srep15803] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 10/06/2015] [Indexed: 12/14/2022] Open
Abstract
Dental enamel formation requires large quantities of Ca(2+) yet the mechanisms mediating Ca(2+) dynamics in enamel cells are unclear. Store-operated Ca(2+) entry (SOCE) channels are important Ca(2+) influx mechanisms in many cells. SOCE involves release of Ca(2+) from intracellular pools followed by Ca(2+) entry. The best-characterized SOCE channels are the Ca(2+) release-activated Ca(2+) (CRAC) channels. As patients with mutations in the CRAC channel genes STIM1 and ORAI1 show abnormal enamel mineralization, we hypothesized that CRAC channels might be an important Ca(2+) uptake mechanism in enamel cells. Investigating primary murine enamel cells, we found that key components of CRAC channels (ORAI1, ORAI2, ORAI3, STIM1, STIM2) were expressed and most abundant during the maturation stage of enamel development. Furthermore, inositol 1,4,5-trisphosphate receptor (IP3R) but not ryanodine receptor (RyR) expression was high in enamel cells suggesting that IP3Rs are the main ER Ca(2+) release mechanism. Passive depletion of ER Ca(2+) stores with thapsigargin resulted in a significant raise in [Ca(2+)]i consistent with SOCE. In cells pre-treated with the CRAC channel blocker Synta-66 Ca(2+) entry was significantly inhibited. These data demonstrate that enamel cells have SOCE mediated by CRAC channels and implicate them as a mechanism for Ca(2+) uptake in enamel formation.
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Babajko S, de La Dure-Molla M, Jedeon K, Berdal A. MSX2 in ameloblast cell fate and activity. Front Physiol 2015; 5:510. [PMID: 25601840 PMCID: PMC4283505 DOI: 10.3389/fphys.2014.00510] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 12/08/2014] [Indexed: 11/29/2022] Open
Abstract
While many effectors have been identified in enamel matrix and cells via genetic studies, physiological networks underlying their expression levels and thus the natural spectrum of enamel thickness and degree of mineralization are now just emerging. Several transcription factors are candidates for enamel gene expression regulation and thus the control of enamel quality. Some of these factors, such as MSX2, are mainly confined to the dental epithelium. MSX2 homeoprotein controls several stages of the ameloblast life cycle. This chapter introduces MSX2 and its target genes in the ameloblast and provides an overview of knowledge regarding its effects in vivo in transgenic mouse models. Currently available in vitro data on the role of MSX2 as a transcription factor and its links to other players in ameloblast gene regulation are considered. MSX2 modulations are relevant to the interplay between developmental, hormonal and environmental pathways and in vivo investigations, notably in the rodent incisor, have provided insight into dental physiology. Indeed, in vivo models are particularly promising for investigating enamel formation and MSX2 function in ameloblast cell fate. MSX2 may be central to the temporal-spatial restriction of enamel protein production by the dental epithelium and thus regulation of enamel quality (thickness and mineralization level) under physiological and pathological conditions. Studies on MSX2 show that amelogenesis is not an isolated process but is part of the more general physiology of coordinated dental-bone complex growth.
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Affiliation(s)
- Sylvie Babajko
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France
| | - Muriel de La Dure-Molla
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France ; Centre de Référence des Maladies Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild Paris, France
| | - Katia Jedeon
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France
| | - Ariane Berdal
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France ; Centre de Référence des Maladies Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild Paris, France
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16
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Jacques J, Hotton D, De la Dure-Molla M, Petit S, Asselin A, Kulkarni AB, Gibson CW, Brookes SJ, Berdal A, Isaac J. Tracking endogenous amelogenin and ameloblastin in vivo. PLoS One 2014; 9:e99626. [PMID: 24933156 PMCID: PMC4059656 DOI: 10.1371/journal.pone.0099626] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 05/16/2014] [Indexed: 01/05/2023] Open
Abstract
Research on enamel matrix proteins (EMPs) is centered on understanding their role in enamel biomineralization and their bioactivity for tissue engineering. While therapeutic application of EMPs has been widely documented, their expression and biological function in non-enamel tissues is unclear. Our first aim was to screen for amelogenin (AMELX) and ameloblastin (AMBN) gene expression in mandibular bones and soft tissues isolated from adult mice (15 weeks old). Using RT-PCR, we showed mRNA expression of AMELX and AMBN in mandibular alveolar and basal bones and, at low levels, in several soft tissues; eyes and ovaries were RNA-positive for AMELX and eyes, tongues and testicles for AMBN. Moreover, in mandibular tissues AMELX and AMBN mRNA levels varied according to two parameters: 1) ontogenic stage (decreasing with age), and 2) tissue-type (e.g. higher level in dental epithelial cells and alveolar bone when compared to basal bone and dental mesenchymal cells in 1 week old mice). In situ hybridization and immunohistodetection were performed in mandibular tissues using AMELX KO mice as controls. We identified AMELX-producing (RNA-positive) cells lining the adjacent alveolar bone and AMBN and AMELX proteins in the microenvironment surrounding EMPs-producing cells. Western blotting of proteins extracted by non-dissociative means revealed that AMELX and AMBN are not exclusive to mineralized matrix; they are present to some degree in a solubilized state in mandibular bone and presumably have some capacity to diffuse. Our data support the notion that AMELX and AMBN may function as growth factor-like molecules solubilized in the aqueous microenvironment. In jaws, they might play some role in bone physiology through autocrine/paracrine pathways, particularly during development and stress-induced remodeling.
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Affiliation(s)
- Jaime Jacques
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
- UFR d'Odontologie, Paris Diderot University - Paris 7, Paris, France
- Unit of Periodontology, Department of Stomatology, University of Talca, Talca, Chile
| | - Dominique Hotton
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
| | - Muriel De la Dure-Molla
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
- UFR d'Odontologie, Paris Diderot University - Paris 7, Paris, France
- Center of Rare Malformations of the Face and Oral Cavity (MAFACE), Hospital Rothschild, AP-HP, Paris, France
| | - Stephane Petit
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
| | - Audrey Asselin
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
| | - Ashok B. Kulkarni
- Functional Genomics Section, Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Carolyn Winters Gibson
- Department of Anatomy and Cell Biology, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania, United States of America
| | - Steven Joseph Brookes
- Department of Oral Biology, School of Dentistry, University of Leeds, United Kingdom
| | - Ariane Berdal
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
- UFR d'Odontologie, Paris Diderot University - Paris 7, Paris, France
- Center of Rare Malformations of the Face and Oral Cavity (MAFACE), Hospital Rothschild, AP-HP, Paris, France
| | - Juliane Isaac
- Laboratory of Molecular Oral Pathophysiology, INSERM UMRS 1138, Team Berdal, Cordeliers Research Center, Pierre and Marie Curie University - Paris 6, Paris Descartes University - Paris 5, Paris, France
- Laboratory of Morphogenesis Molecular Genetics, Department of Developmental and Stem Cells Biology, Institut Pasteur, CNRS URA 2578, Paris, France
- * E-mail:
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Houari S, Wurtz T, Ferbus D, Chateau D, Dessombz A, Berdal A, Babajko S. Asporin and the mineralization process in fluoride-treated rats. J Bone Miner Res 2014; 29:1446-55. [PMID: 24967458 DOI: 10.1002/jbmr.2153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Microarray analysis of odontoblastic cells treated with sodium fluoride has identified the asporin gene as a fluoride target. Asporin is a member of the small leucine-rich repeat proteoglycan/protein (SLRP) family that is believed to be important in the mineralization process. In this study, asporin expression and distribution were investigated by systematic analysis of dentin and enamel, with and without fluoride treatment. Specific attention was focused on a major difference between the two mineralized tissues: the presence of a collagenous scaffold in dentin, and its absence in enamel. Normal and fluorotic, continually growing incisors from Wistar rats treated with 2.5 to 7.5 mM sodium fluoride (NaF) were studied by immunochemistry, in situ hybridization, Western blotting, and RT-qPCR. Asporin was continuously expressed in odontoblasts throughout dentin formation as expected. Asporin was also found, for the first time, in dental epithelial cells, particularly in maturation-stage ameloblasts. NaF decreased asporin expression in odontoblasts and enhanced it in ameloblasts, both in vivo and in vitro. The inverse response in the two cell types suggests that the effector, fluoride, is a trigger that elicits a cell-type-specific reaction. Confocal and ultrastructural immunohistochemistry evidenced an association between asporin and type 1 collagen in the pericellular nonmineralized compartments of both bone and dentin. In addition, transmission electron microscopy revealed asporin in the microenvironment of all cells observed. Thus, asporin is produced by collagen-matrix-forming and non-collagen-matrix-forming cells but may have different effects on the mineralization process. A model is proposed that predicts impaired mineral formation associated with the deficiency and excess of asporin.
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Affiliation(s)
- Sophia Houari
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
| | - Tilmann Wurtz
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
| | - Didier Ferbus
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
| | - Danielle Chateau
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Centre de Recherche des Cordeliers; INSERM UMRS 1138 Intestine: nutrition, barrier and diseases; Paris France
| | - Arnaud Dessombz
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
| | - Ariane Berdal
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
- Hôpital Rothschild; Paris France
| | - Sylvie Babajko
- Centre de Recherche des Cordeliers; French National Institute of Health and Medical Research (INSERM) Unité Mixte de Recherche en Santé (UMRS) 1138, Laboratory of Molecular Oral Pathophysiology; Paris France
- Université Paris-Descartes; Paris France
- Université Pierre et Marie Curie-Paris; Paris France
- Université Paris-Diderot, Unité Fédérative de Recherche (UFR) d'Odontologie; Paris France
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18
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Abstract
Teeth are mineralized organs composed of three unique hard tissues, enamel, dentin, and cementum, and supported by the surrounding alveolar bone. Although odontogenesis differs from osteogenesis in several respects, tooth mineralization is susceptible to similar developmental failures as bone. Here we discuss conditions fitting under the umbrella of rickets, which traditionally referred to skeletal disease associated with vitamin D deficiency but has been more recently expanded to include newly identified factors involved in endocrine regulation of vitamin D, phosphate, and calcium, including phosphate-regulating endopeptidase homolog, X-linked, fibroblast growth factor 23, and dentin matrix protein 1. Systemic mineral metabolism intersects with local regulation of mineralization, and factors including tissue nonspecific alkaline phosphatase are necessary for proper mineralization, where rickets can result from loss of activity of tissue nonspecific alkaline phosphatase. Individuals suffering from rickets often bear the additional burden of a defective dentition, and transgenic mouse models have aided in understanding the nature and mechanisms involved in tooth defects, which may or may not parallel rachitic bone defects. This report reviews dental effects of the range of rachitic disorders, including discussion of etiologies of hereditary forms of rickets, a survey of resulting bone and tooth mineralization disorders, and a discussion of mechanisms, known and hypothesized, involved in the observed dental pathologies. Descriptions of human pathology are augmented by analysis of transgenic mouse models, and new interpretations are brought to bear on questions of how teeth are affected under conditions of rickets. In short, the rachitic tooth will be revealed.
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Affiliation(s)
- Brian L Foster
- National Institute for Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892
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19
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Enamel defects reflect perinatal exposure to bisphenol A. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:108-18. [PMID: 23764278 DOI: 10.1016/j.ajpath.2013.04.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/08/2013] [Accepted: 04/01/2013] [Indexed: 01/21/2023]
Abstract
Endocrine-disrupting chemicals (EDCs), including bisphenol A (BPA), are environmental ubiquitous pollutants and associated with a growing health concern. Anecdotally, molar incisor hypomineralization (MIH) is increasing concurrently with EDC-related conditions, which has led us to investigate the effect of BPA on amelogenesis. Rats were exposed daily to BPA from conception until day 30 or 100. At day 30, BPA-affected enamel exhibited hypomineralization similar to human MIH. Scanning electron microscopy and elemental analysis revealed an abnormal accumulation of organic material in erupted enamel. BPA-affected enamel had an abnormal accumulation of exogenous albumin in the maturation stage. Quantitative real-time PCR, Western blotting, and luciferase reporter assays revealed increased expression of enamelin but decreased expression of kallikrein 4 (protease essential for removing enamel proteins) via transcriptional regulation. Data suggest that BPA exerts its effects on amelogenesis by disrupting normal protein removal from the enamel matrix. Interestingly, in 100-day-old rats, erupting incisor enamel was normal, suggesting amelogenesis is only sensitive to MIH-causing agents during a specific time window during development (as reported for human MIH). The present work documents the first experimental model that replicates MIH and presents BPA as a potential causative agent of MIH. Because human enamel defects are irreversible, MIH may provide an easily accessible marker for reporting early EDC exposure in humans.
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20
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Jaureguiberry G, De la Dure-Molla M, Parry D, Quentric M, Himmerkus N, Koike T, Poulter J, Klootwijk E, Robinette SL, Howie AJ, Patel V, Figueres ML, Stanescu HC, Issler N, Nicholson JK, Bockenhauer D, Laing C, Walsh SB, McCredie DA, Povey S, Asselin A, Picard A, Coulomb A, Medlar AJ, Bailleul-Forestier I, Verloes A, Le Caignec C, Roussey G, Guiol J, Isidor B, Logan C, Shore R, Johnson C, Inglehearn C, Al-Bahlani S, Schmittbuhl M, Clauss F, Huckert M, Laugel V, Ginglinger E, Pajarola S, Spartà G, Bartholdi D, Rauch A, Addor MC, Yamaguti PM, Safatle HP, Acevedo AC, Martelli-Júnior H, dos Santos Netos PE, Coletta RD, Gruessel S, Sandmann C, Ruehmann D, Langman CB, Scheinman SJ, Ozdemir-Ozenen D, Hart TC, Hart PS, Neugebauer U, Schlatter E, Houillier P, Gahl WA, Vikkula M, Bloch-Zupan A, Bleich M, Kitagawa H, Unwin RJ, Mighell A, Berdal A, Kleta R. Nephrocalcinosis (enamel renal syndrome) caused by autosomal recessive FAM20A mutations. NEPHRON. PHYSIOLOGY 2013; 122:1-6. [PMID: 23434854 PMCID: PMC3782194 DOI: 10.1159/000349989] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Accepted: 02/20/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND/AIMS Calcium homeostasis requires regulated cellular and interstitial systems interacting to modulate the activity and movement of this ion. Disruption of these systems in the kidney results in nephrocalcinosis and nephrolithiasis, important medical problems whose pathogenesis is incompletely understood. METHODS We investigated 25 patients from 16 families with unexplained nephrocalcinosis and characteristic dental defects (amelogenesis imperfecta, gingival hyperplasia, impaired tooth eruption). To identify the causative gene, we performed genome-wide linkage analysis, exome capture, next-generation sequencing, and Sanger sequencing. RESULTS All patients had bi-allelic FAM20A mutations segregating with the disease; 20 different mutations were identified. CONCLUSIONS This autosomal recessive disorder, also known as enamel renal syndrome, of FAM20A causes nephrocalcinosis and amelogenesis imperfecta. We speculate that all individuals with biallelic FAM20A mutations will eventually show nephrocalcinosis.
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Affiliation(s)
| | | | - David Parry
- Molecular Medicine, University of Leeds, Leeds, UK
| | - Mickael Quentric
- de Duve Institute, Université catholique de Louvain, Brussels, Belgium
| | | | | | | | | | | | | | - Vaksha Patel
- Centre for Nephrology, University College London, London, UK
| | | | | | - Naomi Issler
- Centre for Nephrology, University College London, London, UK
| | | | | | | | | | | | - Sue Povey
- Department of Genetics, Evolution and Environment, UCL, London, UK
| | | | | | - Aurore Coulomb
- Pathology service, Armand Trousseau Hospital, Paris, France
| | - Alan J. Medlar
- Centre for Nephrology, University College London, London, UK
| | | | - Alain Verloes
- Department of Genetics, APHP – Robert Debré University Hospital, Paris, and Services de, Nantes, France
| | | | | | | | | | - Clare Logan
- Molecular Medicine, University of Leeds, Leeds, UK
| | - Roger Shore
- Leeds Dental Institute, University of Leeds, Leeds, UK
| | | | | | | | | | - François Clauss
- University of Strasbourg, Strasbourg, Hôpital Emile Muller, Mulhouse, France
| | - Mathilde Huckert
- University of Strasbourg, Strasbourg, Hôpital Emile Muller, Mulhouse, France
| | - Virginie Laugel
- IGBMC, INSERM, U964, Illkirch, Hôpital Emile Muller, Mulhouse, France
| | | | - Sandra Pajarola
- Medical Genetics, University of Zurich, Lausanne, Switzerland
| | - Giuseppina Spartà
- Nephrology Unit, University Children's Hospital, Zurich, Lausanne, Switzerland
| | | | - Anita Rauch
- Medical Genetics, University of Zurich, Lausanne, Switzerland
| | | | - Paulo M. Yamaguti
- Health Sciences School, University of Brasilia, Brasilia, São Paulo, Brazil
| | - Heloisa P. Safatle
- Department of Medical Genetics, University of Brasilia, Brasilia, São Paulo, Brazil
| | | | | | | | | | | | | | | | - Craig B. Langman
- Pediatric Nephrology, Northwestern University, Chicago, Ill., Scranton, Pa., USA
| | | | | | - Thomas C. Hart
- Periodontics, University of Illinois at Chicago, Chicago, Ill., Md., USA
| | | | - Ute Neugebauer
- Internal Medicine D, University of Muenster, Muenster, Germany
| | | | - Pascal Houillier
- Cordeliers Research Center, Paris-Descartes University, Paris, France
| | | | - Miikka Vikkula
- de Duve Institute, Université catholique de Louvain, Brussels, Belgium
| | - Agnès Bloch-Zupan
- University of Strasbourg, Strasbourg, Hôpital Emile Muller, Mulhouse, France
| | | | | | - Robert J. Unwin
- Centre for Nephrology, University College London, London, UK
| | - Alan Mighell
- Leeds Dental Institute, University of Leeds, Leeds, UK
| | | | - Robert Kleta
- Centre for Nephrology, University College London, London, UK
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Hubbard MJ, McHugh NJ, Mangum JE. Exclusion of all three calbindins from a calcium-ferry role in rat enamel cells. Eur J Oral Sci 2012; 119 Suppl 1:112-9. [PMID: 22243236 DOI: 10.1111/j.1600-0722.2011.00890.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
It is widely accepted that healthy enamel formation depends on a steady supply of calcium, yet only fragmentary understanding exists about the mechanisms underlying transepithelial calcium transport. Several lines of evidence indicate that calcium principally follows a transcellular route, which classically is thought to be facilitated by cytosolic calcium-binding proteins termed calbindins. In enamel cells, however, this 'calcium-ferry' dogma appears to fail as we previously found that the major calbindin in murine enamel cells (calbindin-28 kDa) was down-regulated during the peak period of calcium transport and enamel was formed normally in mice lacking calbindin-28 kDa. It remains to be clarified whether the two other known calbindins could function as calcium ferries instead. This study used biochemical and proteomic approaches to obtain definitive identification and quantification of the 30-kDa calbindin (calretinin) and calbindin-9 kDa (S100-G) in enamel epithelium from rat. By establishing that both of these calbindins contribute insufficient calcium capacities in molars and incisors, our results render the calcium-ferry dogma untenable. Of significance to enamel defects and dental bioengineering, these findings support other evidence for an alternative organelle-based mode of calcium transport (calcium transcytosis) and also implicate S100-G/calbindin-9 kDa, but not calretinin, in a calcium-signaling role during enamel maturation.
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Affiliation(s)
- Michael J Hubbard
- Department of Biochemistry, University of Otago, Dunedin, New Zealand.
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22
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Bolaños A, Hotton D, Ferbus D, Loiodice S, Berdal A, Babajko S. Regulation of calbindin-D(28k) expression by Msx2 in the dental epithelium. J Histochem Cytochem 2012; 60:603-10. [PMID: 22614360 DOI: 10.1369/0022155412450641] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Amelogenesis involves the coordinated expression of a set of molecules that includes enamel matrix proteins and calcium-binding proteins. Msx2 is a member of the divergent homeobox gene family and is instrumental in dental morphogenesis and biomineralization. This study focused on an EF-hand calcium-binding protein, calbindin-D(28k), which is highly expressed in dental epithelium. In vivo data showed that calbindin-D(28k) levels were higher in ameloblasts from Msx2(+/-) mice than Msx2(+/+) mice. Consistent with this finding, calbindin-D(28k) distribution was affected in transgenic mice with ectopic expression in root epithelium in rests of Malassez in Msx2(+/-) and more clearly in Msx2(-/-) mice. In accordance with these in vivo data, calbindin-D(28k) protein and mRNA levels were decreased in LS8 ameloblast-like cells by exogenous Msx2 overexpression. Furthermore, calbindin-D(28k) promoter activity (nt-1075/+34) was specifically diminished in the presence of Msx2 overexpression, showing that Msx2 behave as a transcriptional repressor for calbindin-D(28k) gene expression. In conclusion, Msx2 may control the spatiotemporally restricted frame of calbindin-D(28k) production in the dental epithelium in relation to enamel mineralization, as previously shown for amelogenin.
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Affiliation(s)
- Alba Bolaños
- Centre de Recherche des Cordeliers, INSERM UMRS 872, Team 5, Laboratory of Molecular Oral Physiopathology, Paris, France
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23
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Descroix V, Kato S, Lézot F, Berdal A. Physiopathology of dental rickets in vitamin D receptor-ablated mice. J Dent Res 2010; 89:1427-32. [PMID: 20929724 DOI: 10.1177/0022034510379603] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
1α25(OH)(2)vitaminD(3) and its nuclear receptor, VDR, are essential for normal tooth development. However, the relative contributions of the direct vs. indirect effects of vitamin D action on odontogenesis are unclear. The aim of this study was to discriminate among the specific roles of 1α25(OH)(2) vitaminD(3), calcemia/phosphatemia, and the maternal environment in mouse VDR null mutants. Microradiographic, histological, and molecular analyses were conducted on adult mice under hypocalcemic/hypophosphatemic vs. normocalcemic/normophosphatemic conditions, and pups of first- (VDR-/- born to VDR+/- dams) vs. second-generation (VDR-/- born to VDR-/- dams) mice. In VDR-/- mice, crown morphogenesis was affected exclusively in second-generation pups. In first-generation adult VDR-/- mice, both enamel and dentin were affected, and pathologic features of root resorption in both apical and cervical regions were observed. Nutritional calcium and phosphate normalization completely rescued the root resorption and partially rescued the dentin and enamel phenotypes (altered cell differentiation and matrix protein expression). Analysis of these data illustrates the co-existence of different pathways of vitamin D action in tooth differentiation and biomineralization. These targeted and cumulative effects would generate the diverse and wide spectrum of dental rickets phenotypes.
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Affiliation(s)
- V Descroix
- Molecular Oral Physiopathology, INSERM UMRS872-IFR 58, Universities Paris 5, Paris 6, and Paris 7, Cordeliers Research Centre, Escalier E, 15 rue de l'école de médecine, 75270 Paris Cedex 06, France.
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24
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Zhang X, Rahemtulla F, Zhang P, Li X, Beck P, Thomas HF. Normalisation of calcium status reverses the phenotype in dentin, but not in enamel of VDR-deficient mice. Arch Oral Biol 2009; 54:1105-10. [PMID: 19850279 DOI: 10.1016/j.archoralbio.2009.09.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Accepted: 09/17/2009] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To determine the effects of vitamin D receptor (VDR) deficiency on mouse dentin and enamel mineralisation, and how normalisation of serum calcium level affects dentin and enamel phenotypes in VDR knockout mice. MATERIALS AND METHODS Groups of VDR wild-type (VDR+/+), VDR deficient (VDR-/-) and VDR-/- rescued mice were sacrificed at 70.5 days of life. The rescued group was established by a high-calcium diet feeding the VDR-/- mice from postnatal 19 days. Micro-CT was used to compare enamel and dentin mineralisation density (MD) at different levels of mandibular incisors among the groups. The scanning electron microscope (SEM) was used to examine the ultrastructure of the enamel and dentin in the corresponding levels and of surface enamel after acidic treatment. RESULTS Micro-CT showed that in VDR-/- rescued group, dentin phenotype was reversed and dentin MD was reversed to normal; however, enamel mineralisation was not reversible, and remained as hypermineralisation in molar region and apical region of the incisors. SEM also revealed enamel hypermineralisation in the VDR-/- rescued group. This early enamel hypermineralisation was more susceptible to acidic erosion. CONCLUSION Vitamin D affects dentin mineralisation systemically, and it regulates enamel mineralisation locally.
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Affiliation(s)
- Xueming Zhang
- Department of Prosthodontics, University of Alabama at Birmingham, 35294-2170, USA.
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25
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Zhang X, Rahemtulla F, Zhang P, Beck P, Thomas HF. Different enamel and dentin mineralization observed in VDR deficient mouse model. Arch Oral Biol 2009; 54:299-305. [PMID: 19200944 DOI: 10.1016/j.archoralbio.2009.01.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 10/03/2008] [Accepted: 01/08/2009] [Indexed: 10/21/2022]
Abstract
UNLABELLED Vitamin D plays an important role in the bone mineralization process. Enamel and dentin are two mineralized tissues of different origins that combine to form teeth, but the mechanism by which vitamin D regulates these tissues remains unclear. We hypothesized that vitamin D affects enamel and dentin mineralization through different mechanisms. OBJECTIVE To examine enamel and dentin mineralization in a vitamin D receptor (VDR) deficient mouse model by micro-computerized tomography (micro-CT) and scanning electronic microscopy (SEM). METHODS VDR wild type mice (VDR+/+) and VDR deficient (VDR-/-) littermates were sacrificed at 70.5 days old, and their mandibles were dissected. Micro-CT was used to compare mineral density (MD) of enamel and dentin of the two groups at different levels along the axis of mandibular incisors. SEM was employed to examine the ultrastructure of incisors at the levels corresponding to the levels used for the micro-CT studies. Furthermore, an accelerated eruption procedure was performed to exclude the effect of delayed eruption on enamel and dentin mineralization. RESULTS Different distribution patterns of enamel and dentin MD were observed between VDR+/+ and VDR-/- groups. Early enamel maturation, mineralization, and hypomineralization in dentin were observed in the VDR deficient mice. CONCLUSION Vitamin D may affect the mineralization of dentin systemically, and enamel mineralization may be regulated locally.
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Affiliation(s)
- Xueming Zhang
- Department of Prosthodontics, University of Alabama at Birmingham, School of Dentistry, Birmingham, AL 35294-0009, United States.
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26
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Lézot F, Thomas B, Greene SR, Hotton D, Yuan ZA, Castaneda B, Bolaños A, Depew M, Sharpe P, Gibson CW, Berdal A. Physiological implications of DLX homeoproteins in enamel formation. J Cell Physiol 2008; 216:688-97. [PMID: 18366088 DOI: 10.1002/jcp.21448] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Tooth development is a complex process including successive stages of initiation, morphogenesis, and histogenesis. The role of the Dlx family of homeobox genes during the early stages of tooth development has been widely analyzed, while little data has been reported on their role in dental histogenesis. The expression pattern of Dlx2 has been described in the mouse incisor; an inverse linear relationship exists between the level of Dlx2 expression and enamel thickness, suggesting a role for Dlx2 in regulation of ameloblast differentiation and activity. In vitro data have revealed that DLX homeoproteins are able to regulate the expression of matrix proteins such as osteocalcin. The aim of the present study was to analyze the expression and function of Dlx genes during amelogenesis. Analysis of Dlx2/LacZ transgenic reporter mice, Dlx2 and Dlx1/Dlx2 null mutant mice, identified spatial variations in Dlx2 expression within molar tooth germs and suggests a role for Dlx2 in the organization of preameloblastic cells as a palisade in the labial region of molars. Later, during the secretory and maturation stages of amelogenesis, the expression pattern in molars was found to be similar to that described in incisors. The expression patterns of the other Dlx genes were examined in incisors and compared to Dlx2. Within the ameloblasts Dlx3 and Dlx6 are expressed constantly throughout presecretory, secretory, and maturation stages; during the secretory phase when Dlx2 is transitorily switched off, Dlx1 expression is upregulated. These data suggest a role for DLX homeoproteins in the morphological control of enamel. Sequence analysis of the amelogenin gene promoter revealed five potential responsive elements for DLX proteins that are shown to be functional for DLX2. Regulation of amelogenin in ameloblasts may be one method by which DLX homeoproteins may control enamel formation. To conclude, this study establishes supplementary functions of Dlx family members during tooth development: the participation in establishment of dental epithelial functional organization and the control of enamel morphogenesis via regulation of amelogenin expression.
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27
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28
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Onishi T, Shintani S, Wakisaka S, Ooshima T. Relationship of vitamin D with calbindin D9k and D28k expression in ameloblasts. Arch Oral Biol 2007; 53:117-23. [PMID: 17981260 DOI: 10.1016/j.archoralbio.2007.09.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 09/21/2007] [Accepted: 09/24/2007] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Calbindin D9k (CB9k) and D28k (CB28k) are intracellular soluble calcium-binding proteins, whose expressions are considered to be regulated by vitamin D. However, the amount of CB28k expression in the kidneys of vitamin D receptor-null mice was reported to be similar to that in wild type mice, suggesting no dependence on vitamin D for its expression in kidneys. In the present study, we evaluated the effects of vitamin D on the expressions of CB9k and CB28k during amelogenesis. DESIGN Rats fed a vitamin D-deficient diet (VD(-) rats) or a standard diet (VD(+) rats) were subjected to immunohistochemical assays using anti-CB9k and anti-CB28k anti-serum. Further, after culturing in medium containing 1,25(OH)(2)D(3) at various doses, quantitative RT-PCR analyses of CB9k and CB28k mRNA were performed using tooth germs from the lower first molars of ICR mice. RESULTS CB9k-immunoreactivity was detected faintly during the secretory stage of ameloblasts in the incisors of VD(+) rats, with increased staining observed during the maturation stage, whereas no such immunoreactivity was detected in those of VD(-) rats. In contrast, the distribution of CB28k in the teeth of VD(-) rats was nearly identical to that in teeth of VD(+) rats, with immunoreactivity detected in both secretory and maturation ameloblasts. Further, quantitative RT-PCR analyses revealed that the amount of CB9k mRNA was increased in a dose-dependent manner, whereas that of CB28k mRNA was not changed. CONCLUSIONS Vitamin D has no effect on the expression of CB28k, whereas it has a significant effect on that of CB9k in ameloblasts.
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Affiliation(s)
- Tomoyuki Onishi
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
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29
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Lézot F, Descroix V, Hotton D, Mauro N, Kato S, Berdal A. Vitamin D and tissue non-specific alkaline phosphatase in dental cells. Eur J Oral Sci 2006; 114 Suppl 1:178-82; discussion 201-2, 381. [PMID: 16674682 DOI: 10.1111/j.1600-0722.2006.00338.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Dental epithelium comprises different cell populations, including ameloblasts and stratum intermedium cells. Ameloblasts are vitamin D targets, and at least five proteins undergo specific modulation of their expression following the addition of 1alpha,25(OH)2 vitamin D3[1alpha,25(OH)2D3]. Stratum intermedium cells have not been studied in any great detail regarding vitamin D impact. Interestingly, in these cells, the tissue non-specific alkaline phosphatase (TNAP) is overexpressed. On the other hand, TNAP is a reliable bone marker of vitamin D action, similar to calbindins in kidney and intestine, previously used for studies of vitamin D activity in ameloblasts. Here, TNAP expression and activity were investigated in vivo in the microdissected epithelium and mesenchyme of mandible incisors. Physiological doses of 1alpha,25(OH)2D3 injected in control rats failed to modify TNAP activity in both dental epithelium and mesenchyme. No significant differences were observed in the steady-state levels of TNAP mRNAs of dental tissues from wild-type and vitamin D nuclear receptor (VDRnuc)-deficient mice of the same litters. These data suggest that, in contrast to ameloblasts, stratum intermedium cells are not sensitive to 1alpha,25(OH)2D3. An explanation for such a responsiveness of stratum intermedium cells to 1alpha,25(OH)2D3 is proposed based on the respective expressions of both vitamin D receptors (VDRnuc and 1,25D3-[MARRS]) and the Dlx2 homeobox gene.
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30
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Teillaud C, Nemere I, Boukhobza F, Mathiot C, Conan N, Oboeuf M, Hotton D, Macdougall M, Berdal A. Modulation of 1alpha,25-dihydroxyvitamin D3-membrane associated, rapid response steroid binding protein expression in mouse odontoblasts by 1alpha,25-(OH)2D3. J Cell Biochem 2005; 94:139-52. [PMID: 15523675 DOI: 10.1002/jcb.20275] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The rapid, nongenomic effects of 1alpha,25-dihydroxyvitamin D3 (1alpha,25-(OH)2D3 have been related to a 1,25D3-membrane associated, rapid response steroid binding protein or 1,25D3-[MARRS]bp, with a molecular weight of 65 kDa, in several tissues and species. Currently, no information is available concerning the nongenomic responses to 1alpha,25-(OH)2D3 in dental tissues. In order to investigate the expression of 1,25D3-[MARRS]bp in dental cells, in the presence or absence of 1alpha,25-(OH)2D3, we have used rabbit polyclonal antibodies directed against the N-terminus of the 1,25D3-[MARRS]bp (Ab099) that recognizes the 1alpha,25-(OH)2D3 binding protein in chick intestinal basolateral membranes and a mouse odontoblast-like cell line (MO6-G3). Western blotting and flow cytometric analyses with Ab099 specifically detected 1,25D3-[MARRS]bp in MO6-G3 cells. Moreover, 1,25D3-[MARRS]bp was up-regulated, in vivo, in differentiated dental cells. Electron microscopic analysis confirmed the plasma membrane localization of this binding protein and also showed its intracellular presence. Incubation of MO6-G3 cells with different doses of 1alpha,25-(OH)2D3 for 36 h resulted in an inhibition of 1,25D3-[MARRS]bp expression with a maximal effect at 50 nM steroid. In addition, the culture media of MO6-G3 cells contains immunoreactive 1,25D3-[MARRS]bp. Immunogold positive membrane vesicle-like structures are present in the extracellular matrix of MO6-G3 cells. Altogether, these results indicate that the 1,25D3-[MARRS]bp expression in MO6-G3 cells is modulated by 1alpha,25-(OH)2D3. In conclusion, this 1alpha,25-(OH)2D3 binding protein could play an important role in the rapid, nongenomic responses to 1alpha,25-(OH)2D3 in dental cells.
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Affiliation(s)
- Christophe Teillaud
- Laboratoire de Biologie-Oro-Faciale et Pathologie, INSERM EMI-U 0110-IFR 58, Université Paris 7, Centre de Recherches Biomédicales des Cordeliers, Escalier E, Paris Cedex 06, France.
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31
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Paula LM, Melo NS, Silva Guerra EN, Mestrinho DH, Acevedo AC. Case report of a rare syndrome associating amelogenesis imperfecta and nephrocalcinosis in a consanguineous family. Arch Oral Biol 2005; 50:237-42. [PMID: 15721155 DOI: 10.1016/j.archoralbio.2004.11.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2004] [Accepted: 11/19/2004] [Indexed: 10/25/2022]
Abstract
A rare syndrome associating amelogenesis imperfecta (AI) with nephrocalcinosis has been reported. The purpose of this study is to characterise the phenotype of a consanguineous family presenting amelogenesis imperfecta, delayed permanent teeth eruption and nephrocalcinosis. Six family members were examined. Ground sections of the case index deciduous teeth and biopsies of enlarged dental follicles were analysed. The patients's parents were first cousins. The case index had yellow discoloration and altered teeth shapes, retention of deciduous teeth, and delayed eruption. Panoramic radiographs revealed multiple enlarged pericoronal follicles in unerupted teeth and generalised intrapulpal calcifications. Renal ultrasound showed the presence of nephrocalcinosis. No other family members presented enamel defects or nephrocalcinosis. Histologically, the enamel appeared hypoplastic, and dental follicles indicated pericoronal hamartoma. The consanguineous marriage suggests an autosomal recessive mode of inheritance. Further studies are necessary to clarify the genetic defect behind this syndrome that associates AI, nephrocalcinosis and impaired tooth eruption.
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Affiliation(s)
- L M Paula
- Dental Anomalies Clinic, University Hospital of Brasilia, Department of Dentistry, Faculty of Health Science, University of Brasilia, SMDB Conjunto 29, Lote 3, Lago Sul, Brasilia 71680-290, DF, Brazil.
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32
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Turnbull CI, Looi K, Mangum JE, Meyer M, Sayer RJ, Hubbard MJ. Calbindin Independence of Calcium Transport in Developing Teeth Contradicts the Calcium Ferry Dogma. J Biol Chem 2004; 279:55850-4. [PMID: 15494408 DOI: 10.1074/jbc.m409299200] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cytosolic calcium-binding proteins termed calbindins are widely regarded as a key component of the machinery used to transport calcium safely across cells. Acting as mobile buffers, calbindins are thought to ferry calcium in bulk and simultaneously protect against its potentially cytotoxic effects. Here, we contradict this dogma by showing that teeth and bones were produced normally in null mutant mice lacking calbindin(28kDa). Structural analysis of dental enamel, the development of which depends critically on active calcium transport, showed that mineralization was unaffected in calbindin(28kDa)-null mutants. An unchanged rate of calcium transport was verified by measurements of (45)Ca incorporation into developing teeth in vivo. In enamel-forming cells, the absence of calbindin(28kDa) was not compensated by other cytosolic calcium-binding proteins as detectable by (45)Ca overlay, two-dimensional gel, and equilibrium binding analyses. Despite a 33% decrease in cytosolic buffer capacity, cytotoxicity was not evident in either the null mutant enamel or its formative cells. This is the first definitive evidence that calbindins are not required for active calcium transport, either as ferries or as facilitative buffers. Moreover, in challenging the broader notion of a cytosolic route for calcium, the findings support an alternative paradigm involving passage via calcium-tolerant organelles.
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Affiliation(s)
- Chris I Turnbull
- Departments of Biochemistry and Physiology, University of Otago, PO Box 56, Dunedin 9001, New Zealand
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33
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Ritchie HH, Park H, Liu J, Bervoets TJM, Bronckers ALJJ. Effects of dexamethasone, vitamin A and vitamin D3 on DSP-PP mRNA expression in rat tooth organ culture. ACTA ACUST UNITED AC 2004; 1679:263-71. [PMID: 15358518 DOI: 10.1016/j.bbaexp.2004.07.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2004] [Revised: 06/28/2004] [Accepted: 07/21/2004] [Indexed: 10/26/2022]
Abstract
Vitamin A, 1,25-dihydroxyvitamin D3 and dexamethasone are well-characterized hydrophobic molecules whose biological actions are mediated via different members of the nuclear hormone receptor family. We report here their actions on tooth formation at the molecular level. We have tested the effects of these compounds on osteopontin (OPN), dentin sialoprotein (DSP-PP), and collagen type I expression in pre-mineralization and mineralization stage rat tooth organ cultures which mirror in vivo developmental patterns. These proteins are all believed to participate in the mineralization of dentin. 1,25-Dihydroxyvitamin D3 up-regulated OPN, but had no effect on DSP-PP mRNA expression. Vitamin A up-regulated DSP-PP expression as did dexamethasone. Dexamethasone also up-regulated collagen type I expression. Our results suggest that 1,25-dihydroxyvitamin D3 does not modulate dentin mineralization by directly affecting DSP-PP expression. Vitamin A likely contributes to dentin mineralization by up-regulating DSP-PP expression. Finally, the up-regulation of DSP-PP expression in tooth germ cultures treated with dexamethasone suggests that its application to patient's dental pulp might promote increased extracellular matrix synthesis and mineralization in the pulp and may explain the narrowing of the dental pulp cavity in patients undergoing long-term dexamethasone administration.
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Affiliation(s)
- H H Ritchie
- Department of Cariology, Restorative Sciences and Endodontics, University of Michigan, Ann Arbor, Michigan 48109-1078, USA.
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Davideau JL, Lezot F, Kato S, Bailleul-Forestier I, Berdal A. Dental alveolar bone defects related to Vitamin D and calcium status. J Steroid Biochem Mol Biol 2004; 89-90:615-8. [PMID: 15225849 DOI: 10.1016/j.jsbmb.2004.03.117] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vitamin D is important for skeletal development, growth, and homeostasis but has been sparsely studied in the oro-facial bone. Dental alveolar bone anchors teeth to mandible and maxilla bones via a periodontal ligament. Its formation and maintenance are strictly dependent on the presence of tooth organs and it is characterized by a high turnover rate. In order to study the role of Vitamin D and the calcium status on dental alveolar bone formation, microradiographic and histologic comparison of wild-type, Vitamin D receptor null mutant (VDR (-/-) hypo- and normo-calcemic mice and tissues were performed at 2 months. In hypo-calcemic VDR (-/-) mice, alveolar bone was hypomineralized and demonstrated a cellular and matrix organization, similar to the immature woven bone. In normo-calcemic VDR (-/-) mice, mineralization of dental alveolar bone appeared normal, but bone was morphologically abnormal in some specific anatomical locations. These data show that Vitamin D and calcium status may control the formation of dental alveolar bone. The differences of phenotype between hypo- and normo-calcemic VDR null mutant mice suggested a specific Vitamin D control of alveolar bone formation by the Vitamin D nuclear receptor pathway.
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Affiliation(s)
- J L Davideau
- Laboratoire de Biologie Orofaciale et Pathologie INSERM E110, Institut des Cordeliers, Université Paris 7, IFR58, 15-21 rue de l'Ecole de Médecine, 75270 Paris, France
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35
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Lézot F, Coudert A, Petit S, Vi-Fane B, Hotton D, Davideau JL, Kato S, Descroix V, Pibouin L, Berdal A. Does Vitamin D play a role on Msx1 homeoprotein expression involving an endogenous antisense mRNA? J Steroid Biochem Mol Biol 2004; 89-90:413-7. [PMID: 15225812 DOI: 10.1016/j.jsbmb.2004.03.116] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Msx1 homeobox gene, a member of Msx family, has been implicated in numerous organs. Its participation was established in different events, such as morphogenetic field determinism and epithelio-mesenchymal interactions. Most of Msx1 target organs are also known for their sensitivity to Vitamin D: such as bone, tooth germ, and hair follicle. Whereas, the expression of Msx2, another member of Msx family, has been shown to be controlled by Vitamin D, no information is available for Msx1. This study aims to analyze the potential relationships between Vitamin D and Msx1 through: (1) comparative analysis of Vitamin D receptor (VDR) and Msx1 protein expression, (2) investigation of Msx1 expression in VDR null mutant mice, and (3) study of Msx1 overexpression impact on osteocalcin VDR expression in immortalized MO6-G3 odontoblasts. Results show the existence of cross-talks between Vitamin D and Msx1 regulation pathways. In odontoblastic cells, Msx1 overexpression decrease VDR expression, whereas in rickets Msx1 sense transcript expression is decreased. These cross-talks may open a new window in the analysis of rickets mineralized tissues physiopathology. In Vitamin D null mutants, the study of the natural Msx1 antisense transcript which has been recently described should be informative.
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Affiliation(s)
- F Lézot
- Laboratoire de Biologie Orofaciale et Pathologie, INSERM E 110, Institut Biomédical des Cordeliers, Université Paris 7, IFR58, 15-21 rue de l'Ecole de Médecine, 75006 Paris, France.
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36
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Onishi T, Okawa R, Murakami H, Ogawa T, Ooshima T, Wakisaka S. Immunolocalization of calbindin D28k and vitamin D receptor during root formation of murine molar teeth. THE ANATOMICAL RECORD. PART A, DISCOVERIES IN MOLECULAR, CELLULAR, AND EVOLUTIONARY BIOLOGY 2003; 273:700-4. [PMID: 12845706 DOI: 10.1002/ar.a.10084] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Cells in the epithelial rest of Malassez (ERM cells) express calbindin D28k (CB); however, the hormonal regulation of CB in ERM cells remains to be elucidated. We investigated the immunohistochemical localization of CB and 1,25-dihydroxyvitamin D3 receptor (VDR) during root formation of mouse molar teeth in order to clarify whether the expression of CB in ERM cells is dependent on vitamin D. At the early stage of root formation (postnatal (PN) days 10-14), both CB- and VDR-immunoreactive cells were observed intermittently along the root surface. In the apical portion, almost all CB-immunoreactive cells showed VDR immunoreactivity; however, VDR-immunoreactive cells in the most apical portion were immunonegative for CB. In the middle and cervical portions, the distributions of the two proteins were completely different. At the late stage of root formation (PN28d) and in adult animals, CB immunoreactivity was distributed in cells found along the acellular cementum at the bifurcation region, as well as between the dentin and cellular cementum in the apical portion (although these lacked immunoreactivity for VDR). The present results indicate that CB expression in newly disrupted cells from Hertwig's epithelial root sheath occurs in a vitamin-D dependent manner, whereas the expression of CB in mature ERM cells may be independent of vitamin D.
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Affiliation(s)
- Tomoyuki Onishi
- Department of Pediatric Dentistry, Osaka University Graduate School of Dentistry, Osaka, Japan
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37
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Lézot F, Descroix V, Mesbah M, Hotton D, Blin C, Papagerakis P, Mauro N, Kato S, MacDougall M, Sharpe P, Berdal A. Cross-talk between Msx/Dlx homeobox genes and vitamin D during tooth mineralization. Connect Tissue Res 2003; 43:509-14. [PMID: 12489206 DOI: 10.1080/03008200290000583] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Rickets is associated with site-specific disorders of enamel and dentin formation, which may reflect the impact of vitamin D on a morphogenetic pathway. This study is devoted to potential cross-talk between vitamin D and Msx/Dlx transcription factors. We raised the question of a potential link between tooth defects seen in mice with rickets and Msx2 gene misexpression, using mutant mice lacking the nuclear vitamin D receptor as an animal model. Our data showed a modulation of Msx2 expression. In order to search for a functional impact of this Msx2 misexpression secondary to rickets, we focused our attention on osteocalcin as a target gene for both vitamin D and Msx2. Combining Msx2 overexpression and vitamin D addition in vitro, we showed an inhibitory effect on osteocalcin expression in immortalized MO6-G3 odontoblasts. Finally, in the same cells, such combinations appeared to modulate VDR expression outlining the existence of complex cross-regulations between vitamin D and Msx/Dix pathways.
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Affiliation(s)
- F Lézot
- Laboratoire de Biologie Orofaciale et Pathologie INSERM EMI 0110, Université Paris 7 EA2380, IFR 58 Institut des Cordeliers, rue de l'Ecole de Médecine, 75006 Paris, France.
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38
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Papagerakis P, MacDougall M, Berdal A. Differential epithelial and mesenchymal regulation of tooth-specific matrix proteins expression by 1,25-dihydroxyvitamin D3 in vivo. Connect Tissue Res 2003; 43:372-5. [PMID: 12489183 DOI: 10.1080/03008200290000655] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Enamel defects have been reported in rickets and related to disturbed expression of amelogenin in ameloblasts. The present study is devoted to amelogenin, enamelin, ameloblastin, and dentin sialophosphoprotein (DSPP) expression in both the epithelium and mesenchyme of vitamin D-deficient rat incisors. Quantitative Northern blotting analysis (relatively to glyceraldehyde-3-phosphate dehydrogenase (GAPDH) mRNA steady-state levels) was performed on microdissected cells of rachitic (-D) and control (+D) 56 day old rats. Steady-state levels of amelogenin and enamelin mRNA were significantly reduced in the -D epithelium versus the +D epithelium ones. In contrast, ameloblastin expression was slightly increased in -D epithelium. In the same samples, DSPP mRNA levels remained unchanged in -D dental mesenchyme. Comparative electron microscopy studies between +D and -D animals showed a dramatic decrease of intraprismatic enamel (amelogenin and enamelin immunoreactive) consistent with our molecular results. In conclusion, tooth formation results from the coordinated expression of several matrix proteins that may be controlled by 1,25-dihydroxyvitamin D3 [1,25(OH)2D3].
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Affiliation(s)
- P Papagerakis
- Department of Pediatric Dentistry, University of Texas Health Sciences Center at San Antonio, San Antonio, USA.
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39
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Abstract
Amelogenin is the major enamel protein produced by ameloblasts. Its expression has been shown to be down-regulated in ameloblasts of vitamin-D-deficient (-D) rats. The potential expression and localization of amelogenin in odontoblasts and its regulation by vitamin D were investigated in this study. RT-PCR and semi-quantitative Northern blot analyses were performed using the odontoblast cell line MO6-G3 and microdissected dental pulp mesenchyme. Both in vitro and in vivo odontoblasts expressed various alternatively spliced amelogenin transcripts. In situ hybridization studies showed that amelogenin expression was restricted to young odontoblasts during mantle dentin deposition. Electron microscopy studies localized the amelogenin protein in the odontoblast cell process cytoplasm and mantle dentin. Amelogenin immunolabeling was stronger in -D rats, suggesting an inverse regulation by vitamin D in odontoblasts. Furthermore, amelogenin mRNA steady-state levels were significantly increased in -D dental pulp mesenchyme. In addition, a temporal-spatial lengthening of the mantle dentin stage was observed in -D animals, suggesting that developmental perturbations occur in relation to the vitamin D status and/or amelogenin expression. These data show that amelogenin is expressed by odontoblasts selectively during mantle dentin deposition. This developmental regulated expression pattern is enhanced under vitamin-D-deficiency status and in a broader context may play an important role during ameloblast and odontoblast differentiation and function.
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Affiliation(s)
- P Papagerakis
- Department of Pediatric Dentistry, Dental School, University of Texas Health Science Center at San Antonio, San Antonio, TX 78284, USA.
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40
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Nishikawa S. Immunohistochemical Localization of SERCA2 in the Ameloblasts of Rat Incisors. Acta Histochem Cytochem 2003. [DOI: 10.1267/ahc.36.331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Sumio Nishikawa
- Department of Biology, Tsurumi University School of Dental Medicine
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41
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Mesbah M, Nemere I, Papagerakis P, Nefussi JR, Orestes-Cardoso S, Nessmann C, Berdal A. Expression of a 1,25-dihydroxyvitamin D3 membrane-associated rapid-response steroid binding protein during human tooth and bone development and biomineralization. J Bone Miner Res 2002; 17:1588-96. [PMID: 12211428 DOI: 10.1359/jbmr.2002.17.9.1588] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The calciotropic hormone 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] has been established to control skeletal tissue formation and biomineralization via the regulation of gene expression. This action involves the well-characterized nuclear 1,25(OH)2D3 receptor. However, it has been recognized that several cellular responses to 1,25(OH)2D3 may not to be related to the exclusive nuclear receptor. Indeed, this secosteroid is able to generate rapid responses that have been proposed to be mediated by interactions of the ligand, which is a putative cell membrane-associated rapid-response steroid (MARRS) binding protein for 1,25(OH)2D3 [1,25D3-MARRS]. The nongenomic pathway of 1,25(OH)2D3 was studied here in detail by immunolocalization of the 1,25D3-MARRS during the specific context of human prenatal development. Western blotting with proteins extracted from 4 week- to 27-week-old embryos was performed, evidencing a 65-kDa molecular species recognized by antibody Ab 099 generated against synthetic peptides corresponding to the N terminus of the 1,25D3-MARRS from chick intestinal basolateral membranes. Based on this biochemical conservation of protein in the human species, the temporospatial expression patterns were established in the craniofacial skeleton at the same ages. Comparative analysis was performed in teeth and bones from early morphogenesis to terminal cell differentiation and extracellular biomineralization. The data show the potential implication of 1,25D3-MARRS in the heterogeneous cell population including ameloblasts, odontoblasts, osteoblasts, and osteoclasts. The epithelial-mesenchymal cascade related to odontogenesis was coincident with a sequence of up- and down-regulation of immunoreactive 1,25D3-MARRS. Biomineralization was associated with a striking up-regulation in the adjoining secretory cells in all tissues. Finally, osteoclasts appeared also to express the 1,25D3-MARRS during these early phases of bone modeling. Previously obtained data of the nuclear vitamin D receptor (VDR) expression and this study on 1,25D3-MARRS suggest the existence of cross-talk between the genomic and nongenomic pathways during human development.
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Affiliation(s)
- Mohand Mesbah
- Laboratoire de Biologie Oro-faciale et Pathologie, INSERM E0110, Institut Biomédicale des Cordeliers, Paris, France
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Smith AJ, Lesot H. Induction and regulation of crown dentinogenesis: embryonic events as a template for dental tissue repair? CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 2002; 12:425-37. [PMID: 12002824 DOI: 10.1177/10454411010120050501] [Citation(s) in RCA: 194] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Close regulation of odontoblast differentiation and subsequent secretory activity is critical for dentinogenesis during both embryogenesis and tissue repair. Some dental papilla cells achieve commitment and specific competence, allowing them to respond to epithelially derived inductive signals during the process of odontoblast differentiation. Temporo-spatial regulation of odontoblast differentiation is dependent on matrix-mediated interactions involving the basement membrane (BM). Experimental studies have highlighted the possible roles of growth factors in these processes. Regulation of functional activity of odontoblasts allows for both ordered secretion of the primary dentin matrix and maintenance of vitality and down-regulation of secretory activity throughout secondary dentinogenesis. After injury to the mature tooth, the fate of the odontoblast can vary according to the intensity of the injury. Milder injury can result in up-regulation of functional activity leading to focal secretion of a reactionary dentin matrix, while greater injury can lead to odontoblast cell death. Induction of differentiation of a new generation of odontoblast-like cells can then lead to reparative dentinogenesis. Many similarities exist between development and repair, including matrix-mediation of the cellular processes and the apparent involvement of growth factors as signaling molecules despite the absence of epithelium during repair. While some of the molecular mediators appear to be common to these processes, the close regulation of primary dentinogenesis may be less ordered during tertiary dentinogenic responses.
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Affiliation(s)
- A J Smith
- Oral Biology, School of Dentistry, University of Birmingham, UK.
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43
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Mistry D, Altini M, Coleman HG, Ali H, Maiorano E. The spatial and temporal expression of calretinin in developing rat molars (Rattus norvegicus). Arch Oral Biol 2001; 46:973-81. [PMID: 11451412 DOI: 10.1016/s0003-9969(01)00046-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Calretinin is a 29-kDa calcium-binding protein abundantly expressed in central and peripheral neural tissues. The aim here was to determine its expression during various stages of odontogenesis. Five categories of embryonic (E) and postnatal (P) rats at various ages (E17, E18, E20, P0, and P7), both male and female, were used to represent the various stages of molar tooth development. The heads of the experimental animals were harvested at the appropriate time and each was cut mid-sagittally and coronally to locate the tooth germs. Selected sections were stained immunohistochemically with polyclonal rabbit anticalretinin at a concentration of 1:25 after microwave irradiation. The results showed that calretinin is distributed widely in epithelium-derived tissues during odontogenesis in rat molar tooth germs. It was expressed focally in the dental lamina, outer enamel epithelium, stellate reticulum and stratum intermedium at different stages. In contrast, it was expressed diffusely and intensely in the inner enamel epithelium and presecretory ameloblasts, although it was discontinuous over the cusp tips. In the secretory ameloblasts, the staining was less intense, being restricted to the cytoplasm, including Tomes' processes. This distribution suggests that calretinin may play a part in enamel formation.
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Affiliation(s)
- D Mistry
- Department of Anatomical Pathology, Division of Oral Pathology, School of Oral Health Sciences, University of the Witwatersrand, 7 York Road, Parktown 2193, South Africa
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44
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Shiba H, Uchida Y, Kamihagi K, Sakata M, Fujita T, Nakamura S, Takemoto T, Kato Y, Kurihara H. Transforming growth factor-beta1 and basic fibroblast growth factor modulate osteocalcin and osteonectin/SPARC syntheses in vitamin-D-activated pulp cells. J Dent Res 2001; 80:1653-9. [PMID: 11597027 DOI: 10.1177/00220345010800071101] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Vitamin D deficiency elicits hypocalcified dentin. However, little is known about the action of vitamin D on the syntheses of dentin matrix proteins. In this study, we examined the effects of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] on the expressions of osteocalcin and osteonectin/secreted protein, acidic and rich in cysteine (SPARC), by human pulp cells in the presence or absence of transforming growth factor-beta1 (TGF-beta1) or basic fibroblast growth factor (bFGF). 1,25(OH)2D3 markedly increased osteocalcin at protein and mRNA levels. The osteocalcin level induced by 1,25(OH)2D3 was decreased and increased by TGF-beta1 and bFGF, respectively. 1,25(OH)2D3 suppressed SPARC synthesis at protein and mRNA levels. TGF-beta1, but not bFGF, increased SPARC synthesis in the presence of 1,25(OH)2D3. SPARC, but not osteocalcin, increased DNA synthesis in pulp cells. These findings suggest that 1,25(OH)2D3 and growth factors interactively regulate the expression of osteocalcin and SPARC in pulp cells, and that SPARC can stimulate DNA synthesis by pulp cells.
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Affiliation(s)
- H Shiba
- Department of Periodontology and Endodontology, Hiroshima University Faculty of Dentistry, Japan.
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45
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Hubbard MJ. Calcium transport across the dental enamel epithelium. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 2001; 11:437-66. [PMID: 11132765 DOI: 10.1177/10454411000110040401] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Dental enamel is the most highly calcified tissue in mammals, and its formation is an issue of fundamental biomedical importance. The enamel-forming cells must somehow supply calcium in bulk yet avoid the cytotoxic effects of excess calcium. Disrupted calcium transport could contribute to a variety of developmental defects in enamel, and the underlying cellular machinery is a potential target for drugs to improve enamel quality. The mechanisms used to transport calcium remain unclear despite much progress in our understanding of enamel formation. Here, current knowledge of how enamel cells handle calcium is reviewed in the context of findings from other epithelial calcium-transport systems. In the past, most attention has focused on approaches to boost the poor diffusion of calcium in cytosol. Recent biochemical findings led to an alternative proposal that calcium is routed through high-capacity stores associated with the endoplasmic reticulum. Research areas needing further attention and a working model are also discussed. Calcium-handling mechanisms in enamel cells are more generally relevant to the understanding of epithelial calcium transport, biomineralization, and calcium toxicity avoidance.
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Affiliation(s)
- M J Hubbard
- Department of Biochemistry, University of Otago, Dunedin, New Zealand.
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46
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Bellido T, Huening M, Raval-Pandya M, Manolagas SC, Christakos S. Calbindin-D28k is expressed in osteoblastic cells and suppresses their apoptosis by inhibiting caspase-3 activity. J Biol Chem 2000; 275:26328-32. [PMID: 10835428 DOI: 10.1074/jbc.m003600200] [Citation(s) in RCA: 118] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The rate of osteoblast apoptosis is a critical determinant of the rate of bone formation. Because the calcium-binding protein calbindin-D(28k) has anti-apoptotic properties in neuronal cells and lymphocytes, we searched for the presence of this protein in osteoblastic cells and investigated whether it can modify their response to proapoptotic signals. Calbindin-D(28K) was expressed at low levels in several osteoblastic cell lines and at high levels in primary cultures of murine osteoblastic cells. Transient transfection of rat calbindin-D(28k) cDNA blocked tumor necrosis factor alpha (TNFalpha)-induced apoptosis in osteoblastic MC3T3-E1 cells, as determined by cell viability and nuclear morphology of cells cotransfected with the green fluorescent protein targeted to the nucleus, whereas transfection of the empty vector had no effect. Calbindin-D(28k) levels in several stably transfected MC3T3-E1 lines were directly related to protection from TNFalpha-induced apoptosis. Purified rat calbindin-D(28k) markedly reduced the activity of caspase-3, a critical molecule for the degradation phase of apoptosis, in a cell-free assay. In addition, cell extracts from MC3T3-E1 cells expressing high levels of calbindin-D(28k) decreased caspase-3 activity, compared with extracts from vector-transfected cells. This effect was apparently unrelated to the calcium binding properties of calbindin, as chelation of calcium by EGTA or addition of other calcium-binding proteins such as calbindin-D(9k), S100, calmodulin, and osteocalcin, did not affect caspase-3 activity. Last, calbindin-D(28k) interacts with the active form of caspase-3 as demonstrated by a GST pull-down assay. These results demonstrate that calbindin-D(28k) is a biosynthetic product of osteoblasts with a role in the regulation of apoptosis. They also reveal that the antiapoptotic properties of calbindin-D(28k) may result not only from calcium buffering but also from the ability of the protein to interact with and to inhibit caspase-3 activity, a property that is independent of its calcium binding capability.
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Affiliation(s)
- T Bellido
- Division of Endocrinology and Metabolism, the Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences, and Central Arkansas Veteterans Health Care System, Little Rock, Arkansas 72205, USA.
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47
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Lézot F, Thomas B, Hotton D, Forest N, Orestes-Cardoso S, Robert B, Sharpe P, Berdal A. Biomineralization, life-time of odontogenic cells and differential expression of the two homeobox genes MSX-1 and DLX-2 in transgenic mice. J Bone Miner Res 2000; 15:430-41. [PMID: 10750557 DOI: 10.1359/jbmr.2000.15.3.430] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Msx and Dlx homeobox genes encode for transcription factors that control early morphogenesis. More specifically, Msx-1, Msx-2, and Dlx-2 homeobox genes contribute to the initial patterning of the dentition. The present study is devoted to the potential role of those homeobox genes during the late formation of mineralized tissues, using the rodent incisor as an experimental system. The continuously erupting mandibular incisor allows (1) the coinvestigation of the whole sequences of amelogenesis and dentinogenesis, aligned along the main dental axis in a single sample in situ and (2) the differential characterization of transcripts generated by epithelial and ectomesenchymal odontogenic cells. Northern blot experiments on microdissected cells showed the continuing expression of Msx-2 and Dlx-2 in the later stages of dental biomineralization, differentially in epithelial and ectomesenchymal compartments. Transgenic mice produced with LacZ reporter constructs for Dlx-2 and Msx-1 were used to detect different components of the gene expression patterns with the sensitive beta-galactosidase histoenzymology. The results show a prominent epithelial involvement of Dlx-2, with stage-specific variations in the cells involved in enamel formation. Quantitative analyses identified specific modulations of Dlx-2 expression in ameloblasts depending on the anatomical sites of the incisor, showing more specifically an inverse linear relationship between the Dlx-2 promoter activity level and enamel thickness. This investigation extends the role of homeoproteins to postmitotic stages, which would control secretory cell activity, in a site-specific manner as shown here for Dlx-2.
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Affiliation(s)
- F Lézot
- Laboratoire de Biologie-Odontologie, EA2380, Institut Biomédical des Cordeliers, Université Paris VII, France
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Hotton D, Mauro N, Lézot F, Forest N, Berdal A. Differential expression and activity of tissue-nonspecific alkaline phosphatase (TNAP) in rat odontogenic cells in vivo. J Histochem Cytochem 1999; 47:1541-52. [PMID: 10567438 DOI: 10.1177/002215549904701206] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Among the four existing isoforms of alkaline phosphatase (AP), the present study is devoted to tissue-nonspecific alkaline phosphatase (TNAP) in mineralized dental tissues. Northern blot analysis and measurements of phosphohydrolase activity on microdissected epithelium and ectomesenchyme, in situ hybridization, and immunolabeling on incisors confirmed that the AP active in rodent teeth is TNAP. Whereas the developmental pattern of TNAP mRNA and protein and the previously described activity were similar in supra-ameloblastic and mesenchymal cells, they differed in enamel-secreting cells, the ameloblasts. As previously shown for other proteins involved in calcium and phosphate handling in ameloblasts, a biphasic pattern of steady-state TNAP mRNA levels was associated with additional variations in ameloblast TNAP protein levels during the cyclic modulation process. Although the association of TNAP upregulation and the initial phase of biomineralization appeared to be a basic feature of all mineralized tissues, ameloblasts (and to a lesser extent, odontoblasts) showed a second selectively prominent upregulation of TNAP mRNA/protein/activity during terminal growth of large enamel crystals only, i.e., the maturation stage. This differential expression/activity for TNAP in teeth vs bone may explain the striking dental phenotype vs bone reported in hypophosphatasia, a hereditary disorder related to TNAP mutation. (J Histochem Cytochem 47:1541-1552, 1999)
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Affiliation(s)
- D Hotton
- Laboratoire de Biologie-Odontologie, Institut Biomédical des Cordeliers, Paris, France
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Papagerakis P, Hotton D, Lezot F, Brookes S, Bonass W, Robinson C, Forest N, Berdal A. Evidence for regulation of amelogenin gene expression by 1,25-dihydroxyvitamin D(3) in vivo. J Cell Biochem 1999; 76:194-205. [PMID: 10618637 DOI: 10.1002/(sici)1097-4644(20000201)76:2<194::aid-jcb4>3.0.co;2-u] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The unique hereditary enamel defect clearly related to the disturbance of one enamel matrix protein is X-linked amelogenesis imperfecta (AI), in which several mutations of amelogenin gene have been identified. The clinical phenotype of many of these subjects shows similarities with enamel defects related to rickets. Therefore, we hypothesized that rachitic dental dysplasia is related to disturbances in the amelogenin pathway. In order to test this hypothesis, combined qualitative and quantitative studies in experimental vitamin D-deficient (-D) rat model systems were performed. First, Western blot analysis of microdissected enamel matrix (secretion and maturation stages) showed no clear evidence of dysregulation of amelogenin protein processing in -D rats as compared with the controls. Second, the ultrastructural investigation permitted identification of the internal tissular defect of rachitic enamel, the irregular absence of intraprismatic enamel observed in -D animals, suggesting a possible link between prism morphogenesis and vitamin D. In addition, the steady-state levels of amelogenin mRNAs measured in microdissected dental cells was decreased in -D rats and up-regulated by an unique injection of 1,25-dihydroxyvitamin D(3) (1,25(OH)(2)D(3)). The present study shows evidences that amelogenin expression is regulated by vitamin D. This is the first study of an hormonal regulation of tooth-specific genes.
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Affiliation(s)
- P Papagerakis
- Laboratoire Biologie-Odontologie, Facult¿e de Chirurgie Dentaire, Universit¿e Paris VII, Paris 75006, France.
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Papagerakis P, Peuchmaur M, Hotton D, Ferkdadji L, Delmas P, Sasaki S, Tagaki T, Berdal A. Aberrant gene expression in epithelial cells of mixed odontogenic tumors. J Dent Res 1999; 78:20-30. [PMID: 10065942 DOI: 10.1177/00220345990780010201] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Comparative investigations of odontogenic cells in normally forming teeth and tumors may provide insights into the mechanisms of the differentiation process. The present study is devoted to late phenotypic markers of ameloblast and odontoblast cells, i.e., proteins involved in biomineralization. The in situ expression of amelogenins, keratins, collagens type III and IV, vimentin, fibronectin, osteonectin, and osteocalcin was performed on normal and tumor odontogenic human cells. The pattern of protein expression showed some similarities between ameloblasts and odontoblasts present in normally developing human teeth and cells present in neoplastic tissues of ameloblastic fibroma, ameloblastic fibro-odontomas, and complex odontomas. Amelogenins (for ameloblasts) and osteocalcin (for odontoblasts) were detected in cells with well-organized enamel and dentin, respectively. In contrast, "mixed" cells located in epithelial zones of mixed odontogenic tumors co-expressed amelogenins and osteocalcin, as shown by immunostaining. The presence of osteocalcin transcripts was also demonstrated by in situ hybridization in these cells. Keratins and vimentin were detected in the same epithelial zones. Tumor epithelial cells were associated with various amounts of polymorphic matrix (amelogenin- and osteocalcin-immunoreactive), depending on the types of mixed tumors. No osteocalcin labeling was found in epithelial tumors. This study confirms that the differentiation of normal and tumor odontogenic cells is accompanied by the expression of some common molecules. Furthermore, the gene products present in normal mesenchymal cells were also shown in odontogenic tumor epithelium. These data may be related to a tumor-specific overexpression of the corresponding genes transcribed at an undetectable level during normal development and/or to an epithelial-mesenchymal transition proposed to occur during normal root formation. A plausible explanation for the results is that the odontogenic tumor epithelial cells are recapitulating genetic programs expressed during normal odontogenesis, but the tumor cells demonstrate abnormal expression patterns for these genes.
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Affiliation(s)
- P Papagerakis
- Laboratoire de Biologie-Odontologie, Institut Biomédical des Cordeliers, Université Paris VII, France
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