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Beck‐Cormier S, Lelliott CJ, Logan JG, Lafont DT, Merametdjian L, Leitch VD, Butterfield NC, Protheroe HJ, Croucher PI, Baldock PA, Gaultier‐Lintia A, Maugars Y, Nicolas G, Banse C, Normant S, Magne N, Gérardin E, Bon N, Sourice S, Guicheux J, Beck L, Williams GR, Bassett JHD. Slc20a2, Encoding the Phosphate Transporter PiT2, Is an Important Genetic Determinant of Bone Quality and Strength. J Bone Miner Res 2019; 34:1101-1114. [PMID: 30721528 PMCID: PMC6618161 DOI: 10.1002/jbmr.3691] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 01/22/2019] [Accepted: 01/26/2019] [Indexed: 12/25/2022]
Abstract
Osteoporosis is characterized by low bone mineral density (BMD) and fragility fracture and affects over 200 million people worldwide. Bone quality describes the material properties that contribute to strength independently of BMD, and its quantitative analysis is a major priority in osteoporosis research. Tissue mineralization is a fundamental process requiring calcium and phosphate transporters. Here we identify impaired bone quality and strength in Slc20a2-/- mice lacking the phosphate transporter SLC20A2. Juveniles had abnormal endochondral and intramembranous ossification, decreased mineral accrual, and short stature. Adults exhibited only small reductions in bone mass and mineralization but a profound impairment of bone strength. Bone quality was severely impaired in Slc20a2-/- mice: yield load (-2.3 SD), maximum load (-1.7 SD), and stiffness (-2.7 SD) were all below values predicted from their bone mineral content as determined in a cohort of 320 wild-type controls. These studies identify Slc20a2 as a physiological regulator of tissue mineralization and highlight its critical role in the determination of bone quality and strength. © 2019 The Authors. Journal of Bone and Mineral Research Published by Wiley Periodicals Inc.
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Affiliation(s)
- Sarah Beck‐Cormier
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
| | | | - John G Logan
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
| | | | - Laure Merametdjian
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
- Centre Hospitalier Universitaire (CHU) NantesPôles Hospitalo‐Universitaires (PHU4) ‐ Ostéo‐articulaire ‐ Tête et Cou ‐ Odontologie ‐ Neurochirurgie ‐ Neuro‐traumatologie (OTONN)NantesFrance
| | - Victoria D Leitch
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
| | - Natalie C Butterfield
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
| | - Hayley J Protheroe
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
| | - Peter I Croucher
- The Garvan Institute of Medical ResearchSydneyNSWAustralia
- St Vincent's Clinical School, Faculty of MedicineUniversity of New South Wales (UNSW) AustraliaSydneyNSWAustralia
| | - Paul A Baldock
- The Garvan Institute of Medical ResearchSydneyNSWAustralia
- St Vincent's Clinical School, Faculty of MedicineUniversity of New South Wales (UNSW) AustraliaSydneyNSWAustralia
| | | | - Yves Maugars
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Centre Hospitalier Universitaire (CHU) NantesPôles Hospitalo‐Universitaires (PHU4) ‐ Ostéo‐articulaire ‐ Tête et Cou ‐ Odontologie ‐ Neurochirurgie ‐ Neuro‐traumatologie (OTONN)NantesFrance
| | - Gael Nicolas
- INSERM U1245Université de Rouen Normandie (UNIROUEN)RouenFrance
- Department of GeneticsRouen University HospitalRouenFrance
- Centre National de Référence pour les Malades Alzheimer Jeunes (CNR‐MAJ)Normandy Center for Genomic and Personalized MedicineRouenFrance
| | | | | | - Nicolas Magne
- Department of NeuroradiologyRouen University HospitalRouenFrance
| | | | - Nina Bon
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
| | - Sophie Sourice
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
| | - Jérôme Guicheux
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
- Centre Hospitalier Universitaire (CHU) NantesPôles Hospitalo‐Universitaires (PHU4) ‐ Ostéo‐articulaire ‐ Tête et Cou ‐ Odontologie ‐ Neurochirurgie ‐ Neuro‐traumatologie (OTONN)NantesFrance
| | - Laurent Beck
- INSERM, UMR 1229, Regenerative Medicine and Skeleton (RMeS), Université de Nantes, École Nationale Vétérinaire, Agroalimentaire et de l'AlimentationNantes‐Atlantique (ONIRIS)NantesFrance
- Université de NantesUnité de Formation et de Recherche (UFR) OdontologieNantesFrance
| | - Graham R Williams
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
| | - J H Duncan Bassett
- Molecular Endocrinology LaboratoryDepartment of MedicineImperial College LondonLondonUK
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Merametdjian L, Prud'Homme T, Le Caignec C, Isidor B, Lopez-Cazaux S. Oro-dental phenotype in patients with RUNX2 duplication. Eur J Med Genet 2018; 62:85-89. [PMID: 29852250 DOI: 10.1016/j.ejmg.2018.05.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 04/17/2018] [Accepted: 05/21/2018] [Indexed: 12/11/2022]
Abstract
Runt-related transcription factor 2 (RUNX2) is well-known for its role in bone development and tooth morphogenesis. Most RUNX2 mutations described in the literature result in loss-of-function mutations of RUNX2 responsible for cleidocranial dysplasia, an autosomal dominant disorder. We describe here the oro-dental phenotype of four patients of a unique family with a 285 kb duplication including the entire sequence of RUNX2, likely responsible for three functional copies of the gene, leading to an increased RUNX2 dosage. Several dental anomalies of number (hypodontia or oligodontia), morphology (microdontia, radiculomegaly, taurodontism or dens invaginatus) and tooth position (rotation) were found in these patients.
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Affiliation(s)
- Laure Merametdjian
- Département d'Odontologie Conservatrice et Endodontie, UFR Odontologie, Université de Nantes, France; Service d'Odontologie Conservatrice et Pédiatrique, Centre de compétences Malformations orales et dentaires rares, CHU de Nantes, France; INSERM, U1229, RMeS, Nantes, France
| | - Tony Prud'Homme
- Service d'Odontologie Conservatrice et Pédiatrique, Centre de compétences Malformations orales et dentaires rares, CHU de Nantes, France; Département D'Odontologie Pédiatrique, UFR Odontologie, Université de Nantes, France; Unité d'Investigation Clinique Odontologie (UIC), France
| | - Cédric Le Caignec
- CHU Nantes, Service de Génétique Médicale, Centre de compétences Malformations orales et dentaires rares, CHU de Nantes, France; INSERM, UMR 1238, Bone Sarcoma and Remodeling of Calcified Tissue, Nantes, France
| | - Bertrand Isidor
- CHU Nantes, Service de Génétique Médicale, Centre de compétences Malformations orales et dentaires rares, CHU de Nantes, France; INSERM, UMR 1238, Bone Sarcoma and Remodeling of Calcified Tissue, Nantes, France
| | - Serena Lopez-Cazaux
- Service d'Odontologie Conservatrice et Pédiatrique, Centre de compétences Malformations orales et dentaires rares, CHU de Nantes, France; Département D'Odontologie Pédiatrique, UFR Odontologie, Université de Nantes, France; Unité d'Investigation Clinique Odontologie (UIC), France.
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Merametdjian L, Beck-Cormier S, Bon N, Couasnay G, Sourice S, Guicheux J, Gaucher C, Beck L. Expression of Phosphate Transporters during Dental Mineralization. J Dent Res 2017; 97:209-217. [PMID: 28892649 DOI: 10.1177/0022034517729811] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The importance of phosphate (Pi) as an essential component of hydroxyapatite crystals suggests a key role for membrane proteins controlling Pi uptake during mineralization in the tooth. To clarify the involvement of the currently known Pi transporters (Slc17a1, Slc34a1, Slc34a2, Slc34a3, Slc20a1, Slc20a2, and Xpr1) during tooth development and mineralization, we determined their spatiotemporal expression in murine tooth germs from embryonic day 14.5 to postnatal day 15 and in human dental samples from Nolla stages 6 to 9. Using real-time polymerase chain reaction, in situ hybridization, immunohistochemistry, and X-gal staining, we showed that the expression of Slc17a1, Slc34a1, and Slc34a3 in tooth germs from C57BL/6 mice were very low. In contrast, Slc34a2, Slc20a1, Slc20a2, and Xpr1 were highly expressed, mostly during the postnatal stages. The expression of Slc20a2 was 2- to 10-fold higher than the other transporters. Comparable results were obtained in human tooth germs. In mice, Slc34a2 and Slc20a1 were predominantly expressed in ameloblasts but not odontoblasts, while Slc20a2 was detected neither in ameloblasts nor in odontoblasts. Rather, Slc20a2 was highly expressed in the stratum intermedium and the subodontoblastic cell layer. Although Slc20a2 knockout mice did not show enamel defects, mutant mice showed a disrupted dentin mineralization, displaying unmerged calcospherites at the mineralization front. This latter phenotypical finding raises the possibility that Slc20a2 may play an indirect role in regulating the extracellular Pi availability for mineralizing cells rather than a direct role in mediating Pi transport through mineralizing plasma cell membranes. By documenting the spatiotemporal expression of Pi transporters in the tooth, our data support the possibility that the currently known Pi transporters may be dispensable for the initiation of dental mineralization and may rather be involved later during the tooth mineralization scheme.
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Affiliation(s)
- L Merametdjian
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France.,3 CHU Nantes, PHU 4 OTONN, Nantes, France
| | - S Beck-Cormier
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France
| | - N Bon
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France
| | - G Couasnay
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France
| | - S Sourice
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France
| | - J Guicheux
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France.,3 CHU Nantes, PHU 4 OTONN, Nantes, France
| | - C Gaucher
- 4 Dental School, University Paris Descartes, PRES Sorbonne Paris Cité, Montrouge, France.,5 AP-HP, Odontology Department, Hôpital Albert Chenevier, GHHM, Créteil, France
| | - L Beck
- 1 INSERM, U1229, RMeS, Nantes, France.,2 Université de Nantes, UMR_S1229, UFR Odontologie, Nantes, France
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Merametdjian L, David A, Bon N, Couasnay G, Guicheux J, Gaucher C, Beck-Cormier S, Beck L. Expression of phosphate transporters in optimized cell culture models for dental cells biomineralization. Bull Group Int Rech Sci Stomatol Odontol 2016; 53:e16. [PMID: 27352424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Indexed: 06/06/2023]
Abstract
Phosphate is a key component of dental mineral composition. The physiological role of membrane proteins of dental cells is suspected to be crucial for mineralization mechanisms. Contrary to published data related to calcium, data on regulation of phosphate flux through membrane of mineralizing cells are scarce. To address this lack of data, we studied the expression of six membranous phosphate transporters in two dental cell lines: a rat odontoblastic cell line (M2H4) and a mouse ameloblastic cell line (ALC) for which we optimized the mineralizing culture conditions.
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