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Qin C, D’Souza R, Feng J. Dentin Matrix Protein 1 (DMP1): New and Important Roles for Biomineralization and Phosphate Homeostasis. J Dent Res 2016; 86:1134-41. [DOI: 10.1177/154405910708601202] [Citation(s) in RCA: 170] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Previously, non-collagenous matrix proteins, such as DMP1, were viewed with little biological interest. The last decade of research has increased our understanding of DMP1, as it is now widely recognized that this protein is expressed in non-mineralized tissues, as well as in cancerous lesions. Protein chemistry studies have shown that the full length of DMP1, as a precursor, is cleaved into two distinct forms: the C-terminal and N-terminal fragments. Functional studies have demonstrated that DMP1 is essential in the maturation of odontoblasts and osteoblasts, as well as in mineralization via local and systemic mechanisms. The identification of DMP1 mutations in humans has led to the discovery of a novel disease: autosomal-recessive hypophosphatemic rickets. Furthermore, the regulation of phosphate homeostasis by DMP1 through FGF23, a newly identified hormone that is released from bone and targeted in the kidneys, sets a new direction for research that associates biomineralization with phosphate regulation.
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Affiliation(s)
- C. Qin
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
| | - R. D’Souza
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
| | - J.Q. Feng
- Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
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Qin C, Baba O, Butler WT. Post-translational Modifications of SIBLING Proteins and Their Roles in Osteogenesis and Dentinogenesis. ACTA ACUST UNITED AC 2016; 15:126-36. [PMID: 15187031 DOI: 10.1177/154411130401500302] [Citation(s) in RCA: 323] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The extracellular matrix (ECM) of bone and dentin contains several non-collagenous proteins. One category of non-collagenous protein is termed the SIBLING (Small Integrin-Binding LIgand, N-linked Glycoprotein) family, that includes osteopontin (OPN), bone sialoprotein (BSP), dentin matrix protein 1 (DMP1), dentin sialophosphoprotein (DSPP), and matrix extracellular phosphoglycoprotein (MEPE). These polyanionic SIBLING proteins are believed to play key biological roles in the mineralization of bone and dentin. Although the specific mechanisms involved in controlling bone and dentin formation are still unknown, it is clear that some functions of the SIBLING family members are dependent on the nature and extent of post-translational modifications (PTMs), such as phosphorylation, glycosylation, and proteolytic processing, since these PTMs would have significant effects on their structure. OPN and BSP are present in the ECM of bone and dentin as full-length forms, whereas amino acid sequencing indicates that DMP1 and DSPP exist as proteolytically processed fragments that result from scission of X-Asp bonds. We hypothesized that the processing of DMP1 and DSPP is catalyzed by the PHEX enzyme, since this protein, an endopeptidase that is predominantly expressed in bone and tooth, has a strong preference for cleavage at the NH2-terminus of aspartyl residue. We envision that the proteolytic processing of DMP1 and DSPP may be an activation process that plays a significant, crucial role in osteogenesis and dentinogenesis, and that a failure in this processing would cause defective mineralization in bone and dentin, as observed in X-linked hypophosphatemic rickets.
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Affiliation(s)
- C Qin
- The Department of Endodontics and Periodontics, University of Texas-Houston Health Science Center, Dental Branch, Houston, TX 77030, USA.
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Korkmaz Y, Bloch W, Steinritz D, Baumann MA, Addicks K, Schneider K, Raab WHM. Bradykinin Mediates Phosphorylation of eNOS in Odontoblasts. J Dent Res 2016; 85:536-41. [PMID: 16723651 DOI: 10.1177/154405910608500611] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
While the activation of eNOS by Akt/PKB-dependent phosphorylation, leading to NO release, and the inhibition of enzyme activity by bradykinin (BK)-mediated phosphorylation of eNOS in endothelial cells are established, the phosphorylation of eNOS in odontoblasts is unknown. To clarify the regulation of eNOS in odontoblasts by BK, we examined the phosphorylation of eNOS, Akt/PKB, and ERK1/2 in odontoblasts of rat molars. BK (10−7 M) transiently induced the phosphorylation of eNOS at Ser1177, Akt/PKB in odontoblasts, while it induced the phosphorylation of eNOS at Thr495 throughout the entire period of BK treatment. BK receptor 2 antagonist HOE 140 (10−6 M) significantly reduced signal intensities of phosphorylated-eNOS at Ser1177, Thr495, and phosphorylated-Akt/PKB. These results suggest that BK has dual effects on the activation of eNOS in odontoblasts, the Akt/PKB-dependent up-regulation of eNOS by the transient phosphorylation at Ser1177, and the ERK1/2-independent down-regulation of eNOS by the phosphorylation at Thr495.
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Affiliation(s)
- Y Korkmaz
- Department of Operative and Preventive Dentistry and Endodontics, Heinrich-Heine-University, Moorenstr. 5, 40225 Düsseldorf, Germany.
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54
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Dentin sialophosphoprotein is a potentially latent bioactive protein in dentin. J Oral Biosci 2016; 58:134-142. [DOI: 10.1016/j.job.2016.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 08/01/2016] [Indexed: 11/18/2022]
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55
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Niu LN, Pei DD, Morris M, Jiao K, Huang XQ, Primus CM, Susin LF, Bergeron BE, Pashley DH, Tay FR. Mineralogenic characteristics of osteogenic lineage-committed human dental pulp stem cells following their exposure to a discoloration-free calcium aluminosilicate cement. Dent Mater 2016; 32:1235-1247. [DOI: 10.1016/j.dental.2016.07.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 07/11/2016] [Accepted: 07/18/2016] [Indexed: 10/21/2022]
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Chiang YC, Chang HH, Wong CC, Wang YP, Wang YL, Huang WH, Lin CP. Nanocrystalline calcium sulfate/hydroxyapatite biphasic compound as a TGF-β1/VEGF reservoir for vital pulp therapy. Dent Mater 2016; 32:1197-1208. [PMID: 27492847 DOI: 10.1016/j.dental.2016.06.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 03/14/2016] [Accepted: 06/22/2016] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Vital pulp therapy aims to treat reversible pulpal injuries via protective dentinogenesis and to preserve more tooth structure. Mineral trioxide aggregate (MTA)-based capping materials demonstrate prolonged setting time increases the risk of pulpal infection during multi-visit treatment. Their non-degradable property occupies pulp space and limits dentin-pulp regeneration. This study reports an inorganic degradable biomaterial that presents a short initial setting time and acts as a growth factor reservoir to promote reparative dentinogenesis. METHODS We synthesize nanocrystalline calcium sulfate hemihydrate (nCS), hydroxyapatite (HAp) and calcium sulfate hemihydrate (CS) as a reservoir to which transforming growth factor-beta 1 (TGF-β1) and vascular endothelial growth factor (VEGF) are added (denoted as nCS/HAp/CS/TGF-β1/VEGF). In vitro biocompatibility and mineralization (the activity and expression of alkaline phosphatase, ALP) were evaluated. Rat animal model was created to test in vivo efficacy. RESULTS Cultured human dental pulp cells (HDPCs) showed that nCS/HAp/CS/TGF-β1/VEGF cement has excellent biocompatibility and the potential to elevate the activity and expression of ALP. The in vivo efficacy (rat animal model) indicates protective dentin by micro-computed tomography (μ-CT) measurements and histological analyses. The 3D μ-CT non-destructive analysis also determines volume changes during pulpotomy, suggesting that the degraded space of the nCS/HAp/CS/TGF-β1/VEGF cement is repaired by the formation of dentin-pulp tissue. SIGNIFICANCE These findings demonstrate that nCS/HAp/CS cement acts as a potent reservoir for the sustained release of growth factors, and that nCS/HAp/CS/TGF-β1/VEGF cement has a high potential to form the reparative dentinogenesis in vivo.
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Affiliation(s)
- Yu-Chih Chiang
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Hao-Hueng Chang
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Ching-Ching Wong
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Yi-Ping Wang
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Yin-Lin Wang
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Wen-Hsuan Huang
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan
| | - Chun-Pin Lin
- School of Dentistry and Graduate Institute of Clinical Dentistry, National Taiwan University and National Taiwan University Hospital, No. 1, Chang-de Street, Taipei 10016, Taiwan; School of Dentistry, China Medical University and China Medical University Hospital, Taichung, Taiwan.
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Yoshida S, Wada N, Hasegawa D, Miyaji H, Mitarai H, Tomokiyo A, Hamano S, Maeda H. Semaphorin 3A Induces Odontoblastic Phenotype in Dental Pulp Stem Cells. J Dent Res 2016; 95:1282-90. [DOI: 10.1177/0022034516653085] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In cases of pulp exposure due to deep dental caries or severe traumatic injuries, existing pulp-capping materials have a limited ability to reconstruct dentin-pulp complexes and can result in pulpectomy because of their low potentials to accelerate dental pulp cell activities, such as migration, proliferation, and differentiation. Therefore, the development of more effective therapeutic agents has been anticipated for direct pulp capping. Dental pulp tissues are enriched with dental pulp stem cells (DPSCs). Here, the authors investigated the effects of semaphorin 3A (Sema3A) on various functions of human DPSCs in vitro and reparative dentin formation in vivo in a rat dental pulp exposure model. Immunofluorescence staining revealed expression of Sema3A and its receptor Nrp1 (neuropilin 1) in rat dental pulp tissue and human DPSC clones. Sema3A induced cell migration, chemotaxis, proliferation, and odontoblastic differentiation of DPSC clones. In addition, Sema3A treatment of DPSC clones increased β-catenin nuclear accumulation, upregulated expression of the FARP2 gene (FERM, RhoGEF, and pleckstrin domain protein 2), and activated Rac1 in DPSC clones. Furthermore, in the rat dental pulp exposure model, Sema3A promoted reparative dentin formation with dentin tubules and a well-aligned odontoblast-like cell layer at the dental pulp exposure site and with novel reparative dentin almost completely covering pulp tissue at 4 wk after direct pulp capping. These findings suggest that Sema3A could play an important role in dentin regeneration via canonical Wnt/β-catenin signaling. Sema3A might be an alternative agent for direct pulp capping, which requires further study.
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Affiliation(s)
- S. Yoshida
- Division of Endodontology, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
| | - N. Wada
- Division of General Dentistry, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
| | - D. Hasegawa
- Division of Endodontology, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
| | - H. Miyaji
- Department of Periodontology and Endodontology, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - H. Mitarai
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - A. Tomokiyo
- Division of Endodontology, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
| | - S. Hamano
- Division of Endodontology, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
| | - H. Maeda
- Division of Endodontology, Kyushu University Hospital, Kyushu University, Fukuoka, Japan
- Department of Endodontology and Operative Dentistry, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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Jaha H, Husein D, Ohyama Y, Xu D, Suzuki S, Huang GTJ, Mochida Y. N-terminal Dentin Sialoprotein fragment induces type I collagen production and upregulates dentinogenesis marker expression in osteoblasts. Biochem Biophys Rep 2016; 6:190-196. [PMID: 27158678 PMCID: PMC4857711 DOI: 10.1016/j.bbrep.2016.04.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Bone and dentin are mineralized extracellular matrices produced by osteoblasts and odontoblasts, respectively, and their major organic portion is type I collagen. Dentinogenesis Imperfecta (DGI) is one of the most common clinically- and genetically-based disturbances of dentin formation, causing irreversible dentin defects. Among several types of DGI, patients with DGI type II exhibit opalescent dentin with partial or complete pulp obliteration. It has been previously reported that the non-sense mutation (c.133C>T) in Dentin Sialophosphoprotein (DSPP) was identified in DGI type II patients at glutamine residue 45, resulting in the premature stop codon (p.Q45X). DSPP is known to be synthesized as a single gene product and further processed at Gly462-Asp463, resulting in the production of Dentin Sialoprotein (DSP) and Dentin Phosphoprotein (DPP). We hypothesized that the shorter form (Q45X) of N-terminal Dentin Sialoprotein (N-DSP) may cause over-production of type I collagen protein as obliterated pulp is occupied by dentin. To test this hypothesis, we generated mouse recombinant Glutathione-S-Transferase (GST)-N-DSP fusion protein, and the effect of GST-N-DSP was investigated in calvarial bone explant culture and MC3T3-E1 osteoblastic culture systems. Here we show that a significant increase in calvarial bone formation is observed by GST-N-DSP. GST-N-DSP accelerates MC3T3-E1 osteoblast cell growth and proliferation and subsequent osteoblast differentiation by inducing the expression of certain osteogenic markers such as type I collagen, Runx2, Osterix and ATF4. Interestingly, GST-N-DSP significantly enhances dentinogenesis marker gene expression including Dspp and Dmp1 gene expression in non-odontogenic MC3T3-E1 cells. To rule out any artificial effect of GST-tag, we also used the synthetic peptide of N-DSP and confirmed the results of N-DSP peptide were essentially similar to those of GST-N-DSP. Taken together, our data suggest that N-DSP promotes bone formation by accelerating osteoblast cell proliferation and subsequent osteoblast differentiation accompanied by marked up-regulation of the dentin matrix markers, such as Dspp and Dmp1 genes. Recombinant N-terminal DSP (N-DSP) protein was generated. N-DSP mimics the non-sense mutation form of Dentinogenesis Imperfecta type II. N-DSP enhances bone formation in clavarial ex vivo cultures. N-DSP accelerates osteoblast proliferation. N-DSP upregulates type I collagen and Dspp expression in non-odontogenic osteoblasts.
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Affiliation(s)
- Haytham Jaha
- Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA 02118, USA
| | - Dina Husein
- Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA 02118, USA
| | - Yoshio Ohyama
- Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA 02118, USA
| | - Dongliang Xu
- Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA 02118, USA; Henan Province People 's Hospital, 7 Weiwu Rd, Zhengzhou, 450003, China
| | - Shigeki Suzuki
- Department of Biological Endodontics, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - George T-J Huang
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Yoshiyuki Mochida
- Department of Molecular and Cell Biology, Boston University, Henry M. Goldman School of Dental Medicine, Boston, MA 02118, USA
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Lim HC, Nam OH, Kim MJ, El-Fiqi A, Yun HM, Lee YM, Jin GZ, Lee HH, Kim HW, Kim EC. Delivery of dexamethasone from bioactive nanofiber matrices stimulates odontogenesis of human dental pulp cells through integrin/BMP/mTOR signaling pathways. Int J Nanomedicine 2016; 11:2557-67. [PMID: 27354790 PMCID: PMC4907710 DOI: 10.2147/ijn.s97846] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Therapeutically relevant design of scaffolds is of special importance in the repair and regeneration of tissues including dentin and pulp. Here we exploit nanofiber matrices that incorporate bioactive glass nanoparticles (BGNs) and deliver the odontogenic drug dexamethasone (DEX) to stimulate the odontogenic differentiation of human dental pulp cells (HDPCs). DEX molecules were first loaded onto the BGN, and then the DEX-BGN complex was incorporated within the biopolymer nanofiber matrix through electrospinning. The release of DEX continued over a month, showing a slow releasing profile. HDPCs cultured on the DEX-releasing BGN matrices were viable, proliferating well up to 14 days. The odontogenic differentiation, as assessed by alkaline phosphatase activity, mRNA expression of genes, and mineralization, was significantly stimulated on the matrices incorporating BGN and further on those releasing DEX. The DEX-releasing BGN matrices highly upregulated the expression of the integrin subsets α1, α5, and β3 as well as integrin downstream signaling molecules, including focal adhesion kinase (FAK), Paxillin, and RhoA, and activated bone morphogenetic protein mRNA and phosphorylation of Smad1/5/8. Furthermore, the DEX-releasing BGN-matrices stimulated Akt and mammalian target of rapamycin (mTOR), which was proven by the inhibition study. Collectively, the designed therapeutic nanofiber matrices that incorporate BGN and deliver DEX were demonstrated to promote odontogenesis of HDPCs, and the integrins, bone morphogenetic protein, and mTOR signaling pathways are proposed to be the possible molecular mechanisms. While further in vivo studies are still needed, the DEX-releasing bioactive scaffolds are considered as a potential therapeutic nanomatrix for regenerative endodontics and tissue engineering.
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Affiliation(s)
- Hyun-Chang Lim
- Department of Periodontology, Kyung Hee University, Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Mi-joo Kim
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Ahmed El-Fiqi
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
| | - Hyung-Mun Yun
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Yoo-Mi Lee
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Guang-Zhen Jin
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
| | - Hae-Hyoung Lee
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Hae-Won Kim
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Eun-Cheol Kim
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Kong X, Li X, Zhang C, Zhu L, Wan H, Zhu J, Liu C, Su H, Qin Q, Chen W, Lin N. Aqueous Fraction of Huogu Formula Promotes Osteogenic Differentiation of Bone Marrow Stromal Cells Through the BMP and Wnt Signaling Pathways. Rejuvenation Res 2016; 19:509-520. [PMID: 27097330 DOI: 10.1089/rej.2015.1795] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Our recent studies have shown that Huogu (HG) formula was effective both in clinic experience and in experimental osteonecrosis of the femoral head (ONFH). Given that defective of bone marrow stromal cells (MSCs) contribute to the development of osteonecrosis and MSCs show enormous potential in the treatment of ONFH, especially to aging people. How HG impacts the differentiation of MSCs and what is the underlying cellular and molecular mechanism remains largely unknown. Here, we found that an aqueous fraction of HG (HGA) significantly increased the alkaline phosphatase (ALP) activity, mineralized nodules, and migration of MSCs in a dose-dependent manner. Meanwhile, HGA could enhance the mRNA and protein expression of Runt-related transcription factor 2 (Runx2), Alp, Bmp2, osteocalcin (Ocn), and Osterix (Osx). Further investigation of the molecular mechanisms revealed that HGA treatment obviously increased expression, secretion, and activation of bone morphogenetic protein (BMP) 2 and β-catenin, two key regulators of the BMP or Wnt signaling pathway. Furthermore, osteogenic differentiation of MSCs could be blocked by using pharmacological inhibitors for these signaling pathways such as Noggin and Dkk-1. Besides, HGA could inhibit adipogenic differentiation of MSCs. Our study reveals that HGA promotes the osteogenesis of MSCs via the BMP and Wnt signaling pathways. Our findings provide mechanistic insights into the role of HG in treating ONFH.
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Affiliation(s)
- Xiangying Kong
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Xiaomin Li
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Cun Zhang
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Liuluan Zhu
- 2 Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University , Beijing, China .,3 Beijing Key Laboratory of Emerging Infectious Diseases , Beijing, China
| | - Hongye Wan
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Jia Zhu
- 4 Wangjing Hospital , China Academy of Chinese Medical Sciences, Beijing, China
| | - Cuiling Liu
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Hongchang Su
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Qingxia Qin
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
| | - Weiheng Chen
- 4 Wangjing Hospital , China Academy of Chinese Medical Sciences, Beijing, China
| | - Na Lin
- 1 Institute of Chinese Materia Medica , China Academy of Chinese Medical Sciences, Beijing, China
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Shigetani Y, Ohkura N, Yoshiba K, Ohshima H, Hosoya A, Yoshiba N, Okiji T. GaAlAs laser-induced pulp mineralization involves dentin matrix protein 1 and osteopontin expression. Oral Dis 2016; 22:399-405. [PMID: 26866618 DOI: 10.1111/odi.12461] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 11/30/2015] [Accepted: 02/03/2016] [Indexed: 11/29/2022]
Abstract
OBJECTIVES GaAlAs lasers induce pulp mineralization by promoting reparative dentinogenesis. This study analyzed the expression of dentin matrix protein 1 (DMP1) and osteopontin in GaAlAs laser-irradiated rat molars, to examine the hypothesis that these proteins play a role in the laser-induced reparative dentinogenic process. MATERIALS AND METHODS The mesial surfaces of the upper first molars of 8-week-old Wistar rats were irradiated with a pulsed GaAlAs laser. After 1-14 days, mRNA expression of DMP1 and osteopontin in the coronal pulp was analyzed using real-time PCR. DMP1, osteopontin, and heat shock protein 25 (HSP25) were immunolocalized at 1-21 days. RESULTS The pulp exhibited a degenerative zone in its mesial portion on days 1-3, and progressive formation of reparative dentin lined with HSP25-immunoreactive odontoblast-like cells, from day 7 onwards. DMP1 and osteopontin mRNA expression were significantly upregulated on days 1-7 and 3-7, respectively. From day 7 onwards, DMP1 and osteopontin immunoreactivity colocalized along the boundary between the primary and reparative dentin. CONCLUSION GaAlAs laser irradiation of rat molars induced upregulated DMP1 and osteopontin mRNA expression in the coronal pulp, followed by the formation of reparative dentin and the colocalization of DMP1 and osteopontin immunoreactivity at the site at which this tissue first appeared.
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Affiliation(s)
- Y Shigetani
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - N Ohkura
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - K Yoshiba
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - H Ohshima
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - A Hosoya
- Department of Oral Histology, Institute for Dental Science, Matsumoto Dental University, Shiojiri, Nagano, Japan
| | - N Yoshiba
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Okiji
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.,Department of Pulp Biology and Endodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
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Lee JH, Kang MS, Mahapatra C, Kim HW. Effect of Aminated Mesoporous Bioactive Glass Nanoparticles on the Differentiation of Dental Pulp Stem Cells. PLoS One 2016; 11:e0150727. [PMID: 26974668 PMCID: PMC4790939 DOI: 10.1371/journal.pone.0150727] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 02/17/2016] [Indexed: 12/12/2022] Open
Abstract
Mesoporous bioactive nanoparticles (MBNs) have been developed as promising additives to various types of bone or dentin regenerative material. However, biofunctionality of MBNs as dentin regenerative additive to dental materials have rarely been studied. We investigated the uptake efficiency of MBNs-NH2 with their endocytosis pathway and the role of MBNs-NH2 in odontogenic differentiation to clarify inherent biofunctionality. MBNs were fabricated by sol-gel synthesis, and 3% APTES was used to aminate these nanoparticles (MBNs-NH2) to reverse their charge from negative to positive. To characterize the MBNs-NH2, TEM, XRD, FTIR, zeta(ξ)-potential measurements, and Brunauer-Emmett-Teller analysis were performed. After primary cultured rat dental pulp stem cells (rDPSCs) were incubated with various concentrations of MBNs-NH2, stem cell viability (24 hours) with or without differentiated media, internalization of MBNs-NH2 in rDPSCs (~4 hours) via specific endocytosis pathway, intra or extracellular ion concentration and odontoblastic differentiation (~28 days) were investigated. Incubation with up to 50 μg/mL of MBNs-NH2 had no effect on rDPSCs viability with differentiated media (p>0.05). The internalization of MBNs-NH2 in rDPSCs was determined about 92% after 4 hours of incubation. Uptake was significantly decreased with ATP depletion and after 1 hour of pre-treatment with the inhibitor of macropinocytosis (p<0.05). There was significant increase of intracellular Ca and Si ion concentration in MBNs-NH2 treated cells compared to no-treated counterpart (p<0.05). The expression of odontogenic-related genes (BSP, COL1A, DMP-1, DSPP, and OCN) and the capacity for biomineralization (based on alkaline phosphatase activity and alizarin red staining) were significantly upregulated with MBNs-NH2. These results indicate that MBNs-NH2 induce odontogenic differentiation of rDPSCs and may serve as a potential dentin regenerative additive to dental material for promoting odontoblast differentiation.
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Affiliation(s)
- Jung-Hwan Lee
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Republic of Korea
| | - Min-Sil Kang
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Republic of Korea
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research, Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
| | - Chinmaya Mahapatra
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research, Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
| | - Hae-Won Kim
- Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 31116, Republic of Korea
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research, Center for Regenerative Medicine, Dankook University, Cheonan 31116, Republic of Korea
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan 31116, Republic of Korea
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Liu X, Li Q, Wang F, Wang Z. Maxillary sinus floor augmentation and dental implant placement using dentin matrix protein-1 gene-modified bone marrow stromal cells mixed with deproteinized boving bone: A comparative study in beagles. Arch Oral Biol 2016; 64:102-8. [PMID: 26826470 DOI: 10.1016/j.archoralbio.2016.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 12/14/2015] [Accepted: 01/10/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE The aim of the study was to evaluate the effects of the combined use of dentin matrix protein-1 (DMP1) gene-modified bone marrow stromal cells (BMSCs) and Bio-Oss(®) for maxillary sinus floor augmentation (MSFA) implant placement in dogs. MATERIALS AND METHODS BMSCs were derived from bone marrow of six beagles and cultured. The cells were transduced with a lentiviral vector overexpressing the DMP1 gene and enhanced green fluorescent protein (EGFP) gene (Lenti-DMP1/EGFP) in test group, and with a lentiviral vector encoding EGFP gene (Lenti-EGFP) in control group. Six dogs received sinus augmentations using the bilateral approach with a simultaneous implant placement at each site respectively. At the same concentration, 2×10(7) cells/ml, one sinus was grafted using a mixture of autologous DMP1/EGFP gene-modified BMSCs and Bio-Oss(®) (DMP1 group), and the contralateral sinus was grafted with autologous EGFP gene-modified bMSCs and Bio-Oss(®) (EGFP group). After a 3 month healing period, bone regeneration and osseointegration were evaluated using histologic and histomorphometric methods. RESULTS The bone-implant contact (BIC) and the bone area fraction in the DMP1 group (BIC: 34.67%±8.23%, bone area fraction: 35.16%±3.32%) were significantly greater compared with the EGFP group (BIC: 26.06%±5.16%, bone area fraction: 20.74%±1.63%) (P<0.05). No significant difference between the residual bone substitute material volume (BSMV) in the DMP1 group (35.86±7.35) and the EGFP group (32.16±9.16) was found in our study (P>0.05). CONCLUSION BMSCs modified with the DMP1 gene can be used as an adjunct to Bio-Oss(®) to enhance new bone formation and the osseointegration of dental implants in MSFA of dogs.
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Affiliation(s)
- Xin Liu
- Laboratory of Oral Biomedical Science and Translational Medicine, Department of Implantation, School and Hospital of Stomatology, Tongji University, Shanghai 200072, China.
| | - Qiong Li
- Laboratory of Oral Biomedical Science and Translational Medicine, Department of Implantation, School and Hospital of Stomatology, Tongji University, Shanghai 200072, China.
| | - Fang Wang
- Laboratory of Oral Biomedical Science and Translational Medicine, Department of Implantation, School and Hospital of Stomatology, Tongji University, Shanghai 200072, China.
| | - Zuolin Wang
- Laboratory of Oral Biomedical Science and Translational Medicine, Department of Implantation, School and Hospital of Stomatology, Tongji University, Shanghai 200072, China.
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Smith AJ, Duncan HF, Diogenes A, Simon S, Cooper PR. Exploiting the Bioactive Properties of the Dentin-Pulp Complex in Regenerative Endodontics. J Endod 2016; 42:47-56. [DOI: 10.1016/j.joen.2015.10.019] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 10/29/2015] [Accepted: 10/29/2015] [Indexed: 02/06/2023]
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Biocompatibility of Novel Type I Collagen Purified from Tilapia Fish Scale: An In Vitro Comparative Study. BIOMED RESEARCH INTERNATIONAL 2015; 2015:139476. [PMID: 26491653 PMCID: PMC4600486 DOI: 10.1155/2015/139476] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 05/29/2015] [Accepted: 05/30/2015] [Indexed: 11/18/2022]
Abstract
Type I collagen (COL-1) is the prevailing component of the extracellular matrix in a number of tissues including skin, ligament, cartilage, bone, and dentin. It is the most widely used tissue-derived natural polymer. Currently, mammalian animals, including pig, cow, and rat, are the three major sources for purification of COL-1. To reduce the risk of zoonotic infectious diseases transmission, minimize the possibility of immunogenic reaction, and avoid problems related to religious issues, exploration of new sources (other than mammalian animals) for the purification of type I collagen is highly desirable. Hence, the purpose of the current study was to investigate the in vitro responses of MDPC-23 to type I collagen isolated from tilapia scale in terms of cellular proliferation, differentiation, and mineralization. The results suggested that tilapia scale collagen exhibited comparable biocompatibility to porcine skin collagen, indicating it might be a potential alternative to type I collagen from mammals in the application for tissue regeneration in oral-maxillofacial area.
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Zhang J, Lin H, Liu H, Zhang L, Yuan G, Chen Z. SP1 promotes the odontoblastic differentiation of dental papilla cells. Dev Growth Differ 2015; 57:400-407. [DOI: 10.1111/dgd.12221] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/08/2015] [Accepted: 04/13/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Jie Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Heng Lin
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Huan Liu
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Lu Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Guohua Yuan
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
| | - Zhi Chen
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM); School and Hospital of Stomatology; Wuhan University; Wuhan China
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Rezai Rad M, Liu D, He H, Brooks H, Xiao M, Wise GE, Yao S. The role of dentin matrix protein 1 (DMP1) in regulation of osteogenic differentiation of rat dental follicle stem cells (DFSCs). Arch Oral Biol 2015; 60:546-56. [PMID: 25596638 PMCID: PMC4352403 DOI: 10.1016/j.archoralbio.2014.12.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 11/06/2014] [Accepted: 12/18/2014] [Indexed: 11/16/2022]
Abstract
OBJECTIVES Primary isolated dental follicle stem cells (DFSCs) possess a strong osteogenesis capability, and such capability is reduced during in vitro culture. Because dentin matrix protein 1 (DMP1) is essential in the maturation of osteoblasts, our objectives were to determine (1) the expression of DMP1 in the DFSCs, (2) the correlation between DMP1 expression and osteogenic capability of DFSCs, and (3) the ability of DMP1 to promote osteogenic differentiation of DFSCs. METHODS DFSCs and their non-stem cell counterpart dental follicle cells (DFC) were established from postnatal rat pups. Expression of DMP1 in the DFSCs and DFC was determined using real-time RT-PCR and western blotting. Different passages of DFSCs were subjected to osteogenic induction. The correlation between osteogenesis and DMP1 expression was analyzed. Then, expression of DMP1 in the DFSCs was knocked-down using siRNA, followed by osteogenic induction to evaluate the effect of DMP1-knockdown. Finally, the late passage DFSCs with reduced DMP1 expression and osteogenic capability were cultured in osteogenic induction medium containing mouse recombinant DMP1 (mrDMP1) to determine if DMP1 can restore osteogenesis of DFSCs. RESULTS DFSCs expressed much higher levels of DMP1 than did DFC. DMP1 expression was correlated with the osteogenic capability of DFSCs. Knockdown of DMP1 expression markedly decreased the osteogenesis and osteogenic gene expression in the DFSCs whereas adding mrDMP1 protein to the osteogenic induction medium enhanced osteogenesis. CONCLUSIONS DMP1 is highly expressed in the DFSCs, but minimally expressed in non-stem cell DFC. DMP1 appears to play an important role for osteogenic differentiation of the DFSCs.
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Affiliation(s)
- Maryam Rezai Rad
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Dawen Liu
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Hongzhi He
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Hunter Brooks
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Mei Xiao
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Gary E Wise
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Shaomian Yao
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
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Nakagawa A, Okinaga T, Ariyoshi W, Morotomi T, Kitamura C, Nishihara T. Effects of Interferon-γ on odontoblastic differentiation and mineralization of odontoblast-like cells. Inflamm Regen 2015. [DOI: 10.2492/inflammregen.35.210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Affiliation(s)
- Aika Nakagawa
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
- Division of Pulp Biology, Operative Dentistry and Endodontology, Department of Cariology and Periodontology, Kyushu Dental University, Fukuoka, Japan
| | - Toshinori Okinaga
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Wataru Ariyoshi
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
| | - Takahiko Morotomi
- Division of Pulp Biology, Operative Dentistry and Endodontology, Department of Cariology and Periodontology, Kyushu Dental University, Fukuoka, Japan
| | - Chiaki Kitamura
- Division of Pulp Biology, Operative Dentistry and Endodontology, Department of Cariology and Periodontology, Kyushu Dental University, Fukuoka, Japan
| | - Tatsuji Nishihara
- Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental University, Fukuoka, Japan
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Oh HJ, Choung HW, Lee HK, Park SJ, Lee JH, Lee DS, Seo BM, Park JC. CPNE7, a preameloblast-derived factor, regulates odontoblastic differentiation of mesenchymal stem cells. Biomaterials 2015; 37:208-17. [PMID: 25453951 DOI: 10.1016/j.biomaterials.2014.10.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/02/2014] [Indexed: 10/24/2022]
Abstract
Tooth development involves sequential interactions between dental epithelial and mesenchymal cells. Our previous studies demonstrated that preameloblast-conditioned medium (PA-CM) induces the odontogenic differentiation of human dental pulp cells (hDPCs), and the novel protein Cpne7 in PA-CM was suggested as a candidate signaling molecule. In the present study, we investigated biological function and mechanisms of Cpne7 in regulation of odontoblast differentiation. Cpne7 was expressed in preameloblasts and secreted extracellularly during ameloblast differentiation. After secretion, Cpne7 protein was translocated to differentiating odontoblasts. In odontoblasts, Cpne7 promoted odontoblastic markers and the expression of Dspp in vitro. Cpne7 also induced odontoblast differentiation and promoted dentin/pulp-like tissue formation in hDPCs in vivo. Moreover, Cpne7 induced differentiation into odontoblasts of non-dental mesenchymal stem cells in vitro, and promoted formation of dentin-like tissues including the structure of dentinal tubules in vivo. Mechanistically, Cpne7 interacted with Nucleolin and modulated odontoblast differentiation via the control of Dspp expression. These results suggest Cpne7 is a diffusible signaling molecule that is secreted by preameloblasts, and regulates the differentiation of mesenchymal cells of dental or non-dental origin into odontoblasts.
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Affiliation(s)
- Hyun-Jung Oh
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Han-Wool Choung
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Hye-Kyung Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Su-Jin Park
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Ji-Hyun Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Dong-Seol Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Byoung-Moo Seo
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul 110-749, Republic of Korea
| | - Joo-Cheol Park
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea.
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Hu LF, Li JB, Qian AR, Wang F, Shang P. Mineralization initiation of MC3T3-E1 preosteoblast is suppressed under simulated microgravity condition. Cell Biol Int 2014; 39:364-72. [PMID: 25318973 DOI: 10.1002/cbin.10391] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 09/17/2014] [Indexed: 01/29/2023]
Abstract
Microgravity decreases the differentiation of osteoblast. However, as this process is multistage and complex, the mechanism by which microgravity inhibits osteoblast differentiation is still unclear. We have previously found that 24 h acute treatment of simulated microgravity (SM) with a random positioning machine (RPM) significantly inhibited the differentiation of preosteoblasts and have explored whether osteoblasts show different response to microgravity condition at other stages, such as the mineralizing-stage. Murine MC3T3-E1 preosteoblasts induced for osteogenic differentiation for seven days were cultured either under normal gravity or SM conditions for 24 h. SM treatment significantly suppressed mineralized nodule formation. Alkaline phosphatase (ALP) activity was dramatically decreased, and the expression of ALP gene was downregulated. Expression of well-known markers and regulators for osteoblasts differentiation, including osteocalcin (OC), type I collagen α1 (Col Iα1), dentin matrix protein 1 (DMP1) and runt-related transcription factor 2 (Runx2), were downregulated. Western blot analysis showed that the phosphorylated extracellular signal-regulated kinase (p-ERK) level was lower under SM condition. Thus, the initiation of osteoblast mineralization is suppressed by SM condition, and the suppression may be through the regulation of ALP activity and the osteogenic gene expression. ERK signaling might be involved in this process. These results are relevant to the decrease of osteoblast maturation and bone formation under microgravity condition.
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Affiliation(s)
- Li-fang Hu
- Key Laboratory for Space Bioscience and Biotechnology, Institute of Special Environmental Biophysics, School of Life Sciences, Northwestern Polytechnical University, Xi'an, 710072, China
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Gannagé-Yared MH, Makrythanasis P, Chouery E, Sobacchi C, Mehawej C, Santoni FA, Guipponi M, Antonarakis SE, Hamamy H, Mégarbané A. Exome sequencing reveals a mutation in DMP1 in a family with familial sclerosing bone dysplasia. Bone 2014; 68:142-5. [PMID: 25180662 DOI: 10.1016/j.bone.2014.08.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 08/18/2014] [Accepted: 08/23/2014] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Hypophosphatemic rickets (HR) comprises a rare group of inherited diseases. Very recently, mutations in the dentin matrix protein 1 (DMP1) gene were identified in patients with an extremely rare autosomal recessive form of HR (ARHR). To date, very few cases of these mutations were reported. MATERIALS AND METHODS A Lebanese consanguineous family with 2 affected sisters was studied. Patients aged 45 and 47years old presented with short stature, severe genu varum, cranial hyperostosis and a very high bone density that led to a diagnosis of a familial sclerosing bone dysplasia. Molecular analysis of known genes involved in osteopetrosis showed normal results. A combination of genotyping and exome sequencing was performed in order to elucidate the genetic basis of this pathology. RESULTS Biochemical analysis was consistent with normal serum calcium and 1-25(OH)2D levels, low to normal serum phosphorus and elevated PTH values. Serum c-terminal FGF-23 was elevated in one of the two patients. A homozygous mutation disrupting the initiation codon of the DMP1 gene (OMIM 600980), NM_001079911.2: c.1A>G, p.Met1Val, was identified by exome sequencing and confirmed by Sanger sequencing. CONCLUSION We report here a family of ARHR secondary to a DMP1 mutation located in the first coding exon of the gene. Our cases show that some ARHR cases may develop with age an unaccountable increase in bone density and bone overgrowth.
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Affiliation(s)
| | - Periklis Makrythanasis
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland; Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.
| | - Eliane Chouery
- Unité de Génétique Médicale, Faculté de Médecine, Université Saint-Joseph, Beirut, Lebanon.
| | - Cristina Sobacchi
- CNR/IRGB, UOS Milan Unit, Milan, Italy; Humanitas Clinical and Research Center, Rozzano, Milano, Italy.
| | - Cybel Mehawej
- Unité de Génétique Médicale, Faculté de Médecine, Université Saint-Joseph, Beirut, Lebanon.
| | - Federico A Santoni
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland.
| | - Michel Guipponi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland.
| | - Stylianos E Antonarakis
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland; Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland; iGE3 Institute of Genetics and Genomics of Geneva, Geneva, Switzerland.
| | - Hanan Hamamy
- Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland.
| | - André Mégarbané
- Département d'Endocrinologie, Faculté de Médecine, Université Saint-Joseph, Beirut, Lebanon; Institut Jérôme Lejeune, Paris, France.
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Kinoshita Y, Hori M, Taguchi M, Fukumoto S. Functional analysis of mutant FAM20C in Raine syndrome with FGF23-related hypophosphatemia. Bone 2014; 67:145-51. [PMID: 25026495 DOI: 10.1016/j.bone.2014.07.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Revised: 06/12/2014] [Accepted: 07/06/2014] [Indexed: 11/17/2022]
Abstract
Raine syndrome is an autosomal recessive disorder characterized by generalized osteosclerosis with periosteal bone formation and a distinctive facial phenotype. Either homozygous or compound heterozygous mutations in family with sequence similarity 20, member C (FAM20C) have been reported to cause this syndrome. Recently, it was reported that fibroblast growth factor 23 (FGF23)-related hypophosphatemia was found in patients with non-lethal Raine syndrome, and Fam20c conditional knockout mice presented Fgf23-related hypophosphatemic rickets. To clarify the mechanism of how FAM20C regulates FGF23, we performed functional analysis of mutant FAM20C proteins reported in Raine syndrome. We analyzed 6 mutant FAM20C proteins (T268M, P328S, R408W, D451N, D478A, and R549W) for their distributions, kinase activities, and effects on dentin matrix protein (DMP1) promoter activity. We also analyzed the effect of Fam20c knockdown on Dmp1 and Fgf23 mRNA levels in UMR-106 cells. As a result, all the mutant FAM20C proteins showed decreased kinase activities compared to wild-type (WT) FAM20C, and most of them also showed impaired secretion. Overexpression of WT FAM20C increased DMP1 promoter activity in Saos-2 cells while mutant FAM20C did not. Fam20c knockdown decreased Dmp1 mRNA and increased Fgf23 mRNA in UMR-106 cells. In conclusion, our results suggest that FAM20C suppresses FGF23 production by enhancing DMP1 expression, and inactivating mutations in FAM20C cause FGF23-related hypophosphatemia by decreasing transcription of DMP1.
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Affiliation(s)
- Yuka Kinoshita
- Division of Nephrology & Endocrinology, Department of Medicine, University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - Michiko Hori
- Division of Nephrology & Endocrinology, Department of Medicine, University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - Manabu Taguchi
- Division of Nephrology & Endocrinology, Department of Medicine, University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - Seiji Fukumoto
- Division of Nephrology & Endocrinology, Department of Medicine, University of Tokyo Hospital, Tokyo 113-8655, Japan.
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Shigetani Y, Yoshiba K, Kuratate M, Takei E, Yoshiba N, Yamanaka Y, Ohshima H, Okiji T. Temporospatial localization of dentine matrix protein 1 following direct pulp capping with calcium hydroxide in rat molars. Int Endod J 2014; 48:573-81. [PMID: 25074651 DOI: 10.1111/iej.12351] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 07/28/2014] [Indexed: 11/29/2022]
Abstract
AIM To examine the temporospatial expression of dentine matrix protein 1 (DMP1; a noncollagenous protein involved in mineralized tissue formation), osteopontin (another noncollagenous protein detected during reparative dentinogenesis) and nestin (a marker of differentiating/differentiated odontoblasts), following direct pulp capping with calcium hydroxide in rat molars. METHODOLOGY The maxillary first molars of 8-week-old Wistar rats had their pulps exposed and capped with calcium hydroxide. The pulp-capped teeth were collected from 6 h to 14 days postoperatively and processed for immunohistochemistry for DMP1, osteopontin and nestin. Cell proliferation was monitored using 5-bromo-2'-deoxyuridine (BrdU) labelling. RESULTS The capped pulps initially exhibited superficial necrotic changes followed by the formation of new matrix and its mineralization. DMP1 immunoreactivity was observed in the matrix beneath the necrotic layer from 6 h onwards and present in the outer portion of the newly formed mineralized matrix from 7 days onwards. Osteopontin displayed a similar expression pattern, although it occupied a narrower area than DMP1 at 6 and 12 h. Nestin-immunoreactive cells appeared beneath the DMP1-immunoreactive area at 1 day, were distributed beneath the newly formed matrix at 5 days and exhibited odontoblast-like morphology by 14 days. BrdU-positive cells significantly increased at 2 and 3 days (P < 0.05) and then decreased. CONCLUSIONS The deposition of DMP1 at exposed pulp sites preceded the appearance of nestin-immunoreactive cells, active cell proliferation and new matrix formation after pulp capping with calcium hydroxide in rat molars, suggesting that DMP1 acts as a trigger of pulp repair. The colocalization of DMP1 and osteopontin suggests that these two proteins play complementary roles.
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Affiliation(s)
- Y Shigetani
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - K Yoshiba
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - M Kuratate
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - E Takei
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - N Yoshiba
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Y Yamanaka
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - H Ohshima
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Okiji
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Lee HK, Lee DS, Park SJ, Cho KH, Bae HS, Park JC. Nuclear factor I-C (NFIC) regulates dentin sialophosphoprotein (DSPP) and E-cadherin via control of Krüppel-like factor 4 (KLF4) during dentinogenesis. J Biol Chem 2014; 289:28225-36. [PMID: 25138274 DOI: 10.1074/jbc.m114.568691] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Odontoblasts are a type of terminally differentiated matrix-secreting cells. A number of molecular mechanisms are involved in the differentiation of odontoblasts. Several studies demonstrated that Krüppel-like factor 4 (KLF4) promotes odontoblast differentiation via control of dentin sialophosphoprotein (DSPP). Because nuclear factor I-C (NFIC) is also known to control DSPP, we investigated the relationship between NFIC and KLF4 during odontoblast differentiation. Klf4 mRNA expression was significantly decreased in Nfic(-/-) pulp cells compared with wild type cells. In immunohistochemistry assays, dentin matrix protein 1 (Dmp1), and DSP protein expression was barely observed in Nfic(-/-) odontoblasts and dentin matrix. Nfic bound directly to the Klf4 promoter and stimulated Klf4 transcriptional activity, thereby regulating Dmp1 and DSPP expression during odontoblast differentiation. Nfic or Klf4 overexpression promoted mineralized nodule formation in MDPC-23 cells. In addition, Nfic overexpression also decreased Slug luciferase activity but augmented E-cadherin promoter activity via up-regulation of Klf4 in odontoblasts. Our study reveals important signaling pathways during dentinogenesis: the Nfic-Klf4-Dmp1-Dspp and the Nfic-Klf4-E-cadherin pathways in odontoblasts. Our results indicate the important role of NFIC in regulating KLF4 during dentinogenesis.
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Affiliation(s)
- Hye-Kyung Lee
- From the Department of Oral Histology-Developmental Biology and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehagro, Chongro-gu, Seoul 110-749, Korea and
| | - Dong-Seol Lee
- From the Department of Oral Histology-Developmental Biology and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehagro, Chongro-gu, Seoul 110-749, Korea and
| | - Su-Jin Park
- From the Department of Oral Histology-Developmental Biology and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehagro, Chongro-gu, Seoul 110-749, Korea and
| | - Kwang-Hee Cho
- the Department of Dental Hygiene, Namseoul University, Cheon-An, Chung-Nam 331-707, Korea
| | - Hyun-Sook Bae
- the Department of Dental Hygiene, Namseoul University, Cheon-An, Chung-Nam 331-707, Korea
| | - Joo-Cheol Park
- From the Department of Oral Histology-Developmental Biology and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehagro, Chongro-gu, Seoul 110-749, Korea and
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Padovano JD, Ramachandran A, Bahmanyar S, Ravindran S, George A. Bone-specific overexpression of DMP1 influences osteogenic gene expression during endochondral and intramembranous ossification. Connect Tissue Res 2014; 55 Suppl 1:121-4. [PMID: 25158195 PMCID: PMC4354770 DOI: 10.3109/03008207.2014.923878] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Dentin matrix protein 1 (DMP1) is a key regulator of biomineralization within the extracellular matrix (ECM) of bone and plays a role in regulating osteogenic gene expression. Osteocalcin (OCN) is one of the most abundantly expressed non-collagenous proteins by osteoblasts. In the present study, we generated a mouse model (OC-DMP1) that overexpresses full-length DMP1 utilizing the mouse OCN promoter. Expression of genes encoding osteogenic transcription factors and ECM proteins during early post-natal development in male OC-DMP1 and wild type (WT) mice was evaluated in femurs and calvaria. Bones were dissected from n = 4 animals at 15, 30, 60 and 90-d of age. Total RNA was isolated, reverse transcribed, and real-time PCR analysis was performed. Results confirmed a difference (p < 0.05) in osteogenic gene expression between OC-DMP1 and WT mice at the specified time points. Additionally, distinctive osteogenic gene expression profiles for calvaria and femur, representing intramembranous and endochondral bone formation, were identified. These data suggest that bone-specific DMP1 overexpression changes the pattern in osteogenic gene expression pattern thereby influencing bone development. This animal model presented here provides new opportunities for analysis of in vivo roles of DMP1 in bone.
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Affiliation(s)
| | | | | | | | - Anne George
- To whom correspondence should be addressed. Department of Oral Biology, University of Illinois at Chicago, Chicago, Il 60612, USA, Tel: 1-312-413-0738; Fax: 1-312-996-6044;
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76
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Odontogenic differentiation and dentin formation of dental pulp cells under nanobioactive glass induction. Acta Biomater 2014; 10:2792-803. [PMID: 24576581 DOI: 10.1016/j.actbio.2014.02.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 12/20/2013] [Accepted: 02/05/2014] [Indexed: 01/09/2023]
Abstract
Bioactive glass (BG) has been widely used in bone regeneration; however, reports on the biological effects of BG on dental pulp cells are rare. This study aims to investigate the effects of nanoscale BG (n-BG) on odontogenic differentiation and dentin formation of dental pulp cells and to compare these effects with those of microscale BG (m-BG). Human dental pulp cells (hDPCs) from third molars were cultured directly with m-BG and n-BG in vitro. The cell proliferation increased at 0.1mgml(-1) BG, which also had a chemotactic effect on hDPCs. The mineralization capacity and expression of odontogenic-related proteins and genes (dentin sialophosphoprotein, dentin matrix protein 1 and collagen type I) of hDPCs were significantly up-regulated under BG induction, and were particularly higher in the n-BG group than in the control group. m-BG and n-BG combined with pulp tissues were transplanted into the dorsum of immunodeficient mice to observe their biological effects on dental pulp cells in vivo. A continuous layer of dentin-like tissue with uniform thickness, a well-organized dentinal tubule structure and polarizing odontoblast-like cells aligned along it was generated upon the n-BG layer, whereas some irregular sporadic osteodentin-like mineralized tissues were observed in the control group. This study reveals that BG, especially n-BG, induces the odontogenic differentiation and dentin formation of dental pulp cells and may serve as a potential material for pulp repair and dentin regeneration.
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77
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Xie X, Ma S, Li C, Liu P, Wang H, Chen L, Qin C. Expression of Small Integrin-Binding LIgand N-linked Glycoproteins (SIBLINGs) in the reparative dentin of rat molars. Dent Traumatol 2014; 30:285-95. [PMID: 24502800 DOI: 10.1111/edt.12093] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/03/2013] [Indexed: 12/27/2022]
Abstract
AIM To analyze the expression and distribution of Small Integrin-Binding LIgand N-linked Glycoproteins (SIBLINGs) in reparative dentin (RepD). METHODOLOGY Cavities on the mesial surfaces of rat molars were prepared to expose the pulp, and a calcium hydroxide agent was applied to cap the exposed pulp. The molars with pulp capping were extracted at postoperative 1, 2, and 4 weeks. The immunolocalization of four SIBLINGs, dentin matrix protein 1 (DMP1), dentin sialoprotein (DSP), bone sialoprotein (BSP), and osteopontin (OPN) in RepD, was analyzed in comparison with reactionary dentin (ReaD) and primary dentin (PD). RESULTS At two weeks after operation, the region of the exposed pulp formed a layer of reparative dentin bridge sealing the communication between the cavity and pulp chamber. Dentinal tubules in RepD were more irregular in shape and fewer in number than PD. At postoperative 2 and 4 weeks, RepD had lower levels of DMP1 and DSP than PD. BSP and OPN were present in RepD, but not in PD. RepD showed certain similarities to ReaD in the expression of SIBLINGs. CONCLUSIONS The reduced levels of DMP1 and DSP may be associated with the decreased number of dentinal tubules in RepD. The expression of BSP and OPN in RepD indicates that the odontoblast-like cells were attempting to produce a hard tissue at a very rapid pace. These findings suggest that in response to the surgical injury, the newly differentiated odontoblast-like cells altered their synthesis of the dentinogenesis-related proteins and produced a hard tissue that is an intermediate between dentin and bone.
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Affiliation(s)
- Xiaohua Xie
- Longjiang Scholar Laboratory, The First Affiliated Hospital of Harbin Medical University, Harbin, China; Department of Endodontics, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
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78
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Asgary S, Nazarian H, Khojasteh A, Shokouhinejad N. Gene expression and cytokine release during odontogenic differentiation of human dental pulp stem cells induced by 2 endodontic biomaterials. J Endod 2013; 40:387-92. [PMID: 24565658 DOI: 10.1016/j.joen.2013.09.017] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 07/18/2013] [Accepted: 09/09/2013] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Mineral trioxide aggregate (MTA) and calcium-enriched mixture (CEM) have shown osteogenic/cementogenic/dentinogenic activities; however, their mechanism of action is not fully understood. We aimed to evaluate the effect of these biomaterials on odontogenic differentiation of human dental pulp stem cells (DPSCs). METHODS Flow cytometry with stem cell markers for the confirmation of stemness and homogeneity was first performed. Then isolated DPSCs were seeded on prepared discs of MTA, CEM, differentiation medium (DM), and growth medium (GM) and incubated up to 14 days. Concentrations of transforming growth factor-β1, bone morphogenetic protein (BMP)2, BMP4, and fibroblast growth factor 4 were measured at each interval using an enzyme-linked immunosorbent assay reader. Gene expression of dentin sialophosphoprotein, dentin matrix protein 1, and the cytokines were evaluated by reverse-transcription polymerase chain reaction. To evaluate the cell morphology, scanning electron micrographs were taken; mineralization potential was evaluated using alizarin red S staining. RESULTS Scanning electron micrographs showed that DPSCs spread/adhered/proliferated similarly on MTA and CEM. On day 14, alizarin red S staining confirmed that mineralization occurred in all groups except GM. Expressions of dentin matrix protein 1 and dentin sialophosphoprotein genes were similar in the CEM, MTA, and DM groups; they were significantly higher compared with the GM group (P < .05). A greater amount of transforming growth factor-β1 gene was expressed in MTA compared with the other groups (P < .05). However, the expression of fibroblast growth factor 4 and BMP2 genes was significantly greater in the CEM group (P < .05). In all the tested groups, the expression of BMP4 was less than GM (P < .01); however, CEM and DM were similar but more than MTA (P < .05). Concentrations of protein product detected using an enzyme-linked immunosorbent assay reader confirmed these gene expressions. CONCLUSIONS MTA and CEM can induce osteo-/odontogenic-like phenotype differentiation of human DPSCs; however, they stimulate different gene expressions and growth factor release.
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Affiliation(s)
- Saeed Asgary
- Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Hamid Nazarian
- Department of Biology and Anatomical Sciences, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Arash Khojasteh
- Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Oral and Maxillofacial Surgery, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Noushin Shokouhinejad
- Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Endodontic Department, Dental School, Tehran University of Medical Sciences, Tehran, Iran
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79
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Lin H, Liu H, Sun Q, Yuan G, Zhang L, Chen Z. KLF4 promoted odontoblastic differentiation of mouse dental papilla cells via regulation of DMP1. J Cell Physiol 2013; 228:2076-85. [PMID: 23558921 DOI: 10.1002/jcp.24377] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 03/25/2013] [Indexed: 11/07/2022]
Abstract
Odontoblasts, which derive from dental papilla, are a type of terminally differentiated matrix-secreting cells. Previous studies have identified various transcription factors involved in the differentiation process of odontoblasts. We have recently found that Krüppel-like factor 4 (Klf4) was expressed in the polarizing and elongating odontoblasts, but the function of Klf4 in the differentiation of odontoblasts is still unclear. We hypothesized Klf4 promoted the differentiation of odontoblasts by up-regulating some odontoblast-related genes. In this study, we found that the expression of Klf4 increased significantly during the odontoblastic differentiation of primary mouse dental papilla cells and the mouse dental papilla cell line-mDPC6T. Overexpression of Klf4 significantly up-regulated odontoblast-related genes, such as Dmp1, Dspp, and Alp, and promoted the accumulation of mineral nodules. Knock-down of Klf4 down-regulated expression of Dmp1, Dspp, and Alp, and inhibited mineral deposition. We applied in silico analysis and identified one target gene of Klf4-Dmp1. Based on further analysis of ChIP data, EMSA and dual luciferase activity assays, we confirmed that Klf4 was able to specifically bind to the Dmp1 promoter and transactivate its expression. Furthermore, forced expression of Dmp1 in the Klf4 knock-down mDPC6T cell line significantly recovered its odontoblastic differentiation ability. Our data confirmed our hypothesis that Klf4 promotes the differentiation of odontoblasts via the up-regulation of Dmp1.
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Affiliation(s)
- Heng Lin
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST), School and Hospital of Stomatology, Wuhan University, Wuhan, China
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80
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Martini D, Trirè A, Breschi L, Mazzoni A, Teti G, Falconi M, Ruggeri A. Dentin matrix protein 1 and dentin sialophosphoprotein in human sound and carious teeth: an immunohistochemical and colorimetric assay. Eur J Histochem 2013; 57:e32. [PMID: 24441185 PMCID: PMC3896034 DOI: 10.4081/ejh.2013.e32] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/16/2013] [Accepted: 09/20/2013] [Indexed: 11/23/2022] Open
Abstract
Dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP) are extracellular matrix proteins produced by odontoblasts involved in the dentin mineralization. The aim this study was to compare the distribution of DMP1 and DSPP in human sound dentin vs human sclerotic dentin. Sixteen sound and sixteen carious human molars were selected, fixed in paraformaldehyde and processed for immunohistochemical detection of DMP1 and DSPP by means of light microscopy, transmission electron microscopy (TEM) and high-resolution field emission in-lens scanning electron microscopy (FEI-SEM). Specimens were submitted to a pre-embedding or a post-embedding immunolabeling technique using primary antibodies anti DMP1 and anti-DSPP and gold-conjugated secondary antibodies. Other samples were processed for the detection of DMP1 and DSPP levels. Dentin from these samples was mechanically fractured to powder, then a protein extraction and a protein level detection assay were performed. DMP1 and DSPP were more abundant in carious than in sound samples. Immunohistochemical analyses in sclerotic dentin disclosed a high expression of DMP1 and DSPP inside the tubules, suggesting an active biomineralization of dentin by odontoblasts. Furthermore, the detection of small amounts of these proteins inside the tubules far from the carious lesion, as shown in the present study, is consistent with the hypothesis of a preventive defense of all dentin after a noxious stimulus has undermined the tooth.
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81
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Yonekura T, Homma H, Sakurai A, Moriguchi M, Miake Y, Toyosawa S, Shintani S. Identification, characterization, and expression of dentin matrix protein 1 gene inXenopus laevis. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2013; 320:525-37. [DOI: 10.1002/jez.b.22529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 07/31/2013] [Accepted: 08/01/2013] [Indexed: 01/05/2023]
Affiliation(s)
- Tomoko Yonekura
- Department of Pediatric Dentistry; Tokyo Dental College; Mihama-ku Chiba Japan
| | - Hiromi Homma
- Department of Pediatric Dentistry; Tokyo Dental College; Mihama-ku Chiba Japan
| | - Atsuo Sakurai
- Department of Pediatric Dentistry; Tokyo Dental College; Mihama-ku Chiba Japan
- Oral Health Science Center hrc8; Tokyo Dental College; Mihama-ku Chiba Japan
| | - Mitsuko Moriguchi
- Department of Ultrastructural Science; Tokyo Dental College; Mihama-ku Chiba Japan
| | - Yasuo Miake
- Department of Ultrastructural Science; Tokyo Dental College; Mihama-ku Chiba Japan
| | - Satoru Toyosawa
- Department of Oral Pathology; Osaka University Graduate School of Dentistry; Suita Osaka Japan
| | - Seikou Shintani
- Department of Pediatric Dentistry; Tokyo Dental College; Mihama-ku Chiba Japan
- Oral Health Science Center hrc8; Tokyo Dental College; Mihama-ku Chiba Japan
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82
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Chang MC, Lin LD, Tseng HC, Chang BE, Chan CP, Lee SY, Chang HH, Lin PS, Tseng SK, Jeng JH. Growth and differentiation factor-5 regulates the growth and differentiation of human dental pulp cells. J Endod 2013; 39:1272-7. [PMID: 24041390 DOI: 10.1016/j.joen.2013.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 06/09/2013] [Accepted: 06/29/2013] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Growth and differentiation factor-5 (GDF-5) is a multifunctional protein that regulates the development and repair in many tissues. The purpose of this study was to investigate whether GDF-5 may influence the proliferation, differentiation, and collagen turnover of human dental pulp cells. METHODS Human dental pulp cells were treated with different concentrations of GDF-5 (0-500 ng/mL). Morphology of pulp cells was observed under a microscope. Cell proliferation was evaluated by 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl-tetrazolium bromide assay. Immunofluorescent assay was used to observe the percentages of cell mitosis. Collagen content was measured by Sircol collagen assay. Tissue inhibitor of metalloproteinase-1 level in the culture medium was measured with enzyme-linked immunosorbent assay and Western blotting. Cell differentiation was evaluated by alkaline phosphatase (ALP) staining and ALP enzyme activity assay. RESULTS After exposure of dental pulp cells to various concentrations of GDF-5, cell number was up-regulated significantly in dose-dependent manner. GDF-5 also stimulated mitosis of dental pulp cells as indicated by an increased percentage of binucleated cells from 28% to 35%-45%. GDF-5 did not affect the collagen content and tissue inhibitor of metalloproteinase-1 level of pulp cells. GDF-5 decreased the ALP activity of pulp cells as analyzed by ALP staining and enzyme activity assay, with 14%-44% of inhibition. CONCLUSIONS GDF-5 revealed mitogenic and proliferative activity to dental pulp cells. GDF-5 showed inhibitory effect on ALP activity but little effect on the collagen turnover. These events are crucial in specific stages of dental pulp repair and regeneration. GDF-5 may be potentially used for tissue engineering of pulp-dentin complex.
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Affiliation(s)
- Mei-Chi Chang
- Biomedical Science Team, Chang Gung University of Science and Technology, Taoyuan, Taiwan
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83
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Wang Y, Cox MK, Coricor G, MacDougall M, Serra R. Inactivation of Tgfbr2 in Osterix-Cre expressing dental mesenchyme disrupts molar root formation. Dev Biol 2013; 382:27-37. [PMID: 23933490 DOI: 10.1016/j.ydbio.2013.08.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 08/01/2013] [Indexed: 11/19/2022]
Abstract
It has been difficult to examine the role of TGF-ß in post-natal tooth development due to perinatal lethality in many of the signaling deficient mouse models. To address the role of Tgfbr2 in postnatal tooth development, we generated a mouse in which Tgfbr2 was deleted in odontoblast- and bone-producing mesenchyme. Osx-Cre;Tgfbr2(fl/fl) mice were generated (Tgfbr2(cko)) and post-natal tooth development was compared in Tgfbr2(cko) and control littermates. X-ray and μCT analysis showed that in Tgfbr2(cko) mice radicular dentin matrix density was reduced in the molars. Molar shape was abnormal and molar eruption was delayed in the mutant mice. Most significantly, defects in root formation, including failure of the root to elongate, were observed by postnatal day 10. Immunostaining for Keratin-14 (K14) was used to delineate Hertwig's epithelial root sheath (HERS). The results showed a delay in elongation and disorganization of the HERS in Tgfbr2(cko) mice. In addition, the HERS was maintained and the break up into epithelial rests was attenuated suggesting that Tgfbr2 acts on dental mesenchyme to indirectly regulate the formation and maintenance of the HERS. Altered odontoblast organization and reduced Dspp expression indicated that odontoblast differentiation was disrupted in the mutant mice likely contributing to the defect in root formation. Nevertheless, expression of Nfic, a key mesenchymal regulator of root development, was similar in Tgfbr2(cko) mice and controls. The number of osteoclasts in the bone surrounding the tooth was reduced and osteoblast differentiation was disrupted likely contributing to both root and eruption defects. We conclude that Tgfbr2 in dental mesenchyme and bone is required for tooth development particularly root formation.
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Affiliation(s)
- Ying Wang
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Megan K Cox
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - George Coricor
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Mary MacDougall
- Institute of Oral Health Research, School of Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Rosa Serra
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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84
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Al-Daghreer S, Doschak M, Sloan AJ, Major PW, Heo G, Scurtescu C, Tsui YY, El-Bialy T. Short-term effect of low-intensity pulsed ultrasound on an ex-vivo 3-d tooth culture. ULTRASOUND IN MEDICINE & BIOLOGY 2013; 39:1066-1074. [PMID: 23499341 DOI: 10.1016/j.ultrasmedbio.2012.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2012] [Revised: 12/07/2012] [Accepted: 12/11/2012] [Indexed: 06/01/2023]
Abstract
We investigated the short-term effect of LIPUS on human dentin-pulp complex in vitro. We collected sixty-three premolars from patients who needed the extraction. The premolars were sectioned transversely into 600-μm-thick slices, and then divided into five groups according to LIPUS application time (control, 5, 10, 15 and 20 min). LIPUS transducer produced an incident intensity of 30 mW/cm(2). After 24 h, tissue was harvested for histomorphometrical analysis and RT-PCR (Genes of interest: Collagen I, DMP1, DSPP, TGF β1, RANKL and OPG). Histomorphometric analysis showed no significant difference among the five groups in the odontoblast count and predentin thickness. RT-PCR demonstrated no expression of TGF β1, low amounts of DSPP, a twofold increase in collagen I expression in the 5- and 10-minute LIPUS groups and a threefold increase in DMP1 expression in the 10-minute LIPUS group. LIPUS application was stimulatory to the dentin-pulp complex in vitro and increased the expression of collagen I and DMP1.
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Affiliation(s)
- Saleh Al-Daghreer
- University of Alberta, Department of Dentistry, Faculty of Medicine & Dentistry, Orthodontic Graduate Program, Edmonton, AB, Canada.
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85
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Cox RF, Morgan MP. Microcalcifications in breast cancer: Lessons from physiological mineralization. Bone 2013; 53:437-50. [PMID: 23334083 DOI: 10.1016/j.bone.2013.01.013] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 01/07/2013] [Accepted: 01/08/2013] [Indexed: 02/02/2023]
Abstract
Mammographic mammary microcalcifications are routinely used for the early detection of breast cancer, however the mechanisms by which they form remain unclear. Two species of mammary microcalcifications have been identified; calcium oxalate and hydroxyapatite. Calcium oxalate is mostly associated with benign lesions of the breast, whereas hydroxyapatite is associated with both benign and malignant tumors. The way in which hydroxyapatite forms within mammary tissue remains largely unexplored, however lessons can be learned from the process of physiological mineralization. Normal physiological mineralization by osteoblasts results in hydroxyapatite deposition in bone. This review brings together existing knowledge from the field of physiological mineralization and juxtaposes it with our current understanding of the genesis of mammary microcalcifications. As an increasing number of breast cancers are being detected in their non-palpable stage through mammographic microcalcifications, it is important that future studies investigate the underlying mechanisms of their formation in order to fully understand the significance of this unique early marker of breast cancer.
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Affiliation(s)
- Rachel F Cox
- Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, 123 St. Stephen's Green, Dublin 2, Ireland
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86
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Gopinathan G, Kolokythas A, Luan X, Diekwisch TGH. Epigenetic marks define the lineage and differentiation potential of two distinct neural crest-derived intermediate odontogenic progenitor populations. Stem Cells Dev 2013; 22:1763-78. [PMID: 23379639 DOI: 10.1089/scd.2012.0711] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Epigenetic mechanisms, such as histone modifications, play an active role in the differentiation and lineage commitment of mesenchymal stem cells. In the present study, epigenetic states and differentiation profiles of two odontogenic neural crest-derived intermediate progenitor populations were compared: dental pulp (DP) and dental follicle (DF). ChIP on chip assays revealed substantial H3K27me3-mediated repression of odontoblast lineage genes DSPP and dentin matrix protein 1 (DMP1) in DF cells, but not in DP cells. Mineralization inductive conditions caused steep increases of mineralization and patterning gene expression levels in DP cells when compared to DF cells. In contrast, mineralization induction resulted in a highly dynamic histone modification response in DF cells, while there was only a subdued effect in DP cells. Both DF and DP progenitors featured H3K4me3-active marks on the promoters of early mineralization genes RUNX2, MSX2, and DLX5, while OSX, IBSP, and BGLAP promoters were enriched for H3K9me3 or H3K27me3. Compared to DF cells, DP cells expressed higher levels of three pluripotency-associated genes, OCT4, NANOG, and SOX2. Finally, gene ontology comparison of bivalent marks unique for DP and DF cells highlighted cell-cell attachment genes in DP cells and neurogenesis genes in DF cells. In conclusion, the present study indicates that the DF intermediate odontogenic neural crest lineage is distinguished from its DP counterpart by epigenetic repression of DSPP and DMP1 genes and through dynamic histone enrichment responses to mineralization induction. Findings presented here highlight the crucial role of epigenetic regulatory mechanisms in the terminal differentiation of odontogenic neural crest lineages.
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Affiliation(s)
- Gokul Gopinathan
- UIC Brodie Laboratory for Craniofacial Genetics, UIC College of Dentistry, Chicago, Illinois 60612, USA
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87
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Gibson MP, Zhu Q, Wang S, Liu Q, Liu Y, Wang X, Yuan B, Ruest LB, Feng JQ, D'Souza RN, Qin C, Lu Y. The rescue of dentin matrix protein 1 (DMP1)-deficient tooth defects by the transgenic expression of dentin sialophosphoprotein (DSPP) indicates that DSPP is a downstream effector molecule of DMP1 in dentinogenesis. J Biol Chem 2013; 288:7204-14. [PMID: 23349460 PMCID: PMC3591629 DOI: 10.1074/jbc.m112.445775] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Revised: 01/08/2013] [Indexed: 01/10/2023] Open
Abstract
Dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP) are essential for the formation of dentin. Previous in vitro studies have indicated that DMP1 might regulate the expression of DSPP during dentinogenesis. To examine whether DMP1 controls dentinogenesis through the regulation of DSPP in vivo, we cross-bred transgenic mice expressing normal DSPP driven by a 3.6-kb rat Col1a1 promoter with Dmp1 KO mice to generate mice expressing the DSPP transgene in the Dmp1 KO genetic background (referred to as "Dmp1 KO/DSPP Tg mice"). We used morphological, histological, and biochemical techniques to characterize the dentin and alveolar bone of Dmp1 KO/DSPP Tg mice compared with Dmp1 KO and wild-type mice. Our analyses showed that the expression of endogenous DSPP was remarkably reduced in the Dmp1 KO mice. Furthermore, the transgenic expression of DSPP rescued the tooth and alveolar bone defects of the Dmp1 KO mice. In addition, our in vitro analyses showed that DMP1 and its 57-kDa C-terminal fragment significantly up-regulated the Dspp promoter activities in a mesenchymal cell line. In contrast, the expression of DMP1 was not altered in the Dspp KO mice. These results provide strong evidence that DSPP is a downstream effector molecule that mediates the roles of DMP1 in dentinogenesis.
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Affiliation(s)
- Monica Prasad Gibson
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Qinglin Zhu
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Suzhen Wang
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Qilin Liu
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Ying Liu
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Xiaofang Wang
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Baozhi Yuan
- the Department of Medicine, University of Wisconsin, and Geriatric Research Education and Clinical Centers, Madison, Wisconsin 53705
| | - L. Bruno Ruest
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Jian Q. Feng
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Rena N. D'Souza
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Chunlin Qin
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
| | - Yongbo Lu
- From the Department of Biomedical Sciences, Texas A&M Health Science Center, Baylor College of Dentistry, Dallas, Texas 75246 and
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88
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Roballo KCS, Ercolin ACM, Casals JB, Pieri NCG, Barreto RSN, Illera MJ, Martins DS, Miglino MA, Ambrósio CE. Domestic carnivore's development: detection of Oct-4, a pluripotency marker, in pharyngeal arches. Reprod Domest Anim 2013; 48:e41-3. [PMID: 23379423 DOI: 10.1111/rda.12147] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 01/02/2013] [Indexed: 12/17/2022]
Abstract
Very few carnivore's embryology is reported mainly restricted to old literature without new technique analyses. Also, their development focuses on pharyngeal arches and stem cell sources and the high capacity for differentiation from those cells to generate embryonic tissue. We aimed to use immunohistochemistry to prove the potentiality of these stem cell niches. The results were to highlight the timetable for the development of dogs and cats, the proper formation of pharyngeal arches and the description of these cells on first and second arches since 17-25 days of pregnancy. After that, the differentiation process is reduced.
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Affiliation(s)
- K C S Roballo
- Department of Veterinary Medicine, Faculty of Animal Sciences and Food Engineering, University of São Paulo, Pirassununga, SP, Brazil
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89
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Lin H, Liu H, Sun Q, Yuan G, Zhang L, Chen Z. Establishment and characterization of a tamoxifen-mediated reversible immortalized mouse dental papilla cell line. In Vitro Cell Dev Biol Anim 2013; 49:114-21. [DOI: 10.1007/s11626-012-9576-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 12/14/2012] [Indexed: 11/28/2022]
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90
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Pei X, Pan L, Cui F, He R, Bao H, Wan Q, Wang J. The recombinant human dentin matrix protein 1-coated titanium and its effect on the attachment, proliferation and ALP activity of MG63 cells. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2717-2726. [PMID: 22903598 DOI: 10.1007/s10856-012-4724-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Accepted: 07/14/2012] [Indexed: 06/01/2023]
Abstract
The aim of the present work was to design a bio-interactive implant surface by coating recombinant human dentin matrix protein 1 (hDMP1) onto titanium and to investigate the biological function of this material. Firstly, the plasmid containing the hDMP1 cDNA was constructed and hDMP1 was expressed, purified and characterized. Then, hDMP1 was coated onto the surface of Ti substrates via a biochemical technique and the procedure was divided into three steps: in the beginning, titanium was treated by regular polishing and denoted as Cp-Ti; then, Cp-Ti received alkaline and water treatment and was nominated as AW-Ti; finally, AW-Ti was coated with hDMP1 and referred to as hDMP1-Ti. The inserts of hDMP1 genes were detected by enzyme digestion as well as gel electrophoresis, and the complete nucleotide sequence of hDMP1 was tested. The purified recombinant hDMP1 was electrophoresed on a 10 % SDS-PAGE gel. Cp-Ti, AW-Ti and hDMP1-Ti were characterized by X-ray photoelectron spectroscope and water contact angles tests. The biological activity of MG63 cells cultured in the three groups was investigated by the cell attachment, proliferation and alkaline phosphatase activity assays. The results show that hDMP1 was successfully constructed and coated onto the titanium surface, and hDMP1-Ti had higher hydrophilicity than Cp-Ti. Compared with Cp-Ti and AW-Ti, hDMP1-Ti showed better in vitro bioactivity.
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Affiliation(s)
- Xibo Pei
- Department of Prosthodontics, West China College of Stomatology, Sichuan University, Renmin Nanlu, Chengdu, China
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91
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Lu Y, Li Y, Cavender AC, Wang S, Mansukhani A, D’Souza RN. Molecular studies on the roles of Runx2 and Twist1 in regulating FGF signaling. Dev Dyn 2012; 241:1708-15. [PMID: 22972545 PMCID: PMC4153435 DOI: 10.1002/dvdy.23858] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2012] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Supernumerary teeth are often observed in patients suffering from cleidocranial dysplasia due to a mutation in Runx2 that results in haploinsufficiency. However, the underlying molecular mechanisms are poorly defined. In this study, we assessed the roles of Runx2 and its functional antagonist Twist1 in regulating fibroblast growth factor (FGF) signaling using in vitro biochemical approaches. RESULTS We showed that Twist1 stimulated Fgfr2 and Fgf10 expression in a mesenchymal cell line and that it formed heterodimers with ubiquitously expressed E12 (together with E47 encoded by E2A gene) and upregulated Fgfr2 and Fgf10 promoter activities in a dental mesenchyme-derived cell line. We further demonstrated that the bHLH domain of Twist1 was essential for its synergistic activation of Fgfr2 promoter with E12 and that the binding of E12 stabilized Twist1 by preventing it from undergoing lysosomal degradation. Although Runx2 had no apparent effects on Fgfr2 and Fgf10 promoter activities, it inhibited the stimulatory activity of Twist1 on Fgfr2 promoter. CONCLUSIONS These findings suggest that Runx2 haploinsufficiency might result in excessive unbound Twist1 that can freely bind to E12 and enhance FGF signaling, thereby promoting the formation of extra teeth.
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Affiliation(s)
- Yongbo Lu
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA
| | - Yucheng Li
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA
- Department of Operative Dentistry and Endodontics, School of Stomatology, Fourth Military Medical University, Xi’an, Shaanxi, 710032, China
| | - Adriana C. Cavender
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA
| | - Suzhen Wang
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA
| | - Alka Mansukhani
- New York University School of Medicine – Langone Medical Center, 550 First Avenue, New York, NY10016 USA
| | - Rena N. D’Souza
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave, Dallas, TX 75246, USA
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92
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Bae WJ, Min KS, Kim JJ, Kim JJ, Kim HW, Kim EC. Odontogenic responses of human dental pulp cells to collagen/nanobioactive glass nanocomposites. Dent Mater 2012; 28:1271-9. [PMID: 23031484 DOI: 10.1016/j.dental.2012.09.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 09/11/2012] [Accepted: 09/11/2012] [Indexed: 12/27/2022]
Abstract
OBJECTIVES Collagen-based nanocomposite incorporating nanobioactive glass (Col/nBG) was developed as a scaffolding matrix for dentin-pulp regeneration. The effects of the novel matrix on the proliferation of human dental pulp cells (hDPCs) and their differentiation into odontoblastic lineage were investigated. METHODS Nanocomposite scaffold was prepared by incorporating nBG within the Col solution and then reconstituting them into a membrane form. Cell growth by MTS assay, adhesion by scanning electron microscopy (SEM), and odontoblastic differentiation by alkaline phosphatase (ALP) activity, mineralization, and the mRNA expression of differentiation-related genes of DPCs on each scaffold were evaluated. RESULTS The introduction of nBG significantly improved the bone mineral-like apatite formation in the simulated body fluid, suggesting excellent acellular bone-bioactivity. The hDPCs cultured on the Col/nBG nanocomposite have shown active growth behavior during culture for 14 days. The mRNA levels of major organic extracellular matrix of dentin, collagen type I and III were highly expressed in the Col/nBG matrix. Moreover, the alkaline phosphatase (ALP) activity and the mineralized nodule formation were increased in the Col/nBG nanocomposite compared to those in Col. Odontoblatic differentiation genes, including dentin sialophosphoprotein, dentin matrix protein I, ALP, osteopontin and osteocalcin were significantly stimulated in the Col containing nBG. Moreover, the key adhesion receptor integrin components α2 and β1, specifically binding to collagen molecule sequence, were upregulated in Col/nBG compared to Col, suggesting that odontogenic stimulation was closely related to the integrin-mediated process. SIGNIFICANCE In our study, the nanocomposite Col/nBG matrix induced the growth and odontogenic differentiation more effectively than Col alone, providing a promising scaffold condition for regeneration of dentin-pulp complex tissue.
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Affiliation(s)
- Won-Jung Bae
- Department of Maxillofacial Tissue Regeneration, School of Dentistry and Institute of Oral Biology, Kyung Hee University, Seoul, Republic of Korea
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93
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Staines KA, MacRae VE, Farquharson C. The importance of the SIBLING family of proteins on skeletal mineralisation and bone remodelling. J Endocrinol 2012; 214:241-55. [PMID: 22700194 DOI: 10.1530/joe-12-0143] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The small integrin-binding ligand N-linked glycoprotein (SIBLING) family consists of osteopontin, bone sialoprotein, dentin matrix protein 1, dentin sialophosphoprotein and matrix extracellular phosphoglycoprotein. These proteins share many structural characteristics and are primarily located in bone and dentin. Accumulating evidence has implicated the SIBLING proteins in matrix mineralisation. Therefore, in this review, we discuss the individual role that each of the SIBLING proteins has in this highly orchestrated process. In particular, we emphasise how the nature and extent of their proteolytic processing and post-translational modification affect their functional role. Finally, we describe the likely roles of the SIBLING proteins in clinical disorders of hypophosphataemia and their potential therapeutic use.
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Affiliation(s)
- Katherine A Staines
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, Easter Bush, Edinburgh, Midlothian EH25 9RG, UK.
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94
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Siyam A, Wang S, Qin C, Mues G, Stevens R, D'Souza RN, Lu Y. Nuclear localization of DMP1 proteins suggests a role in intracellular signaling. Biochem Biophys Res Commun 2012; 424:641-6. [PMID: 22813642 PMCID: PMC3412887 DOI: 10.1016/j.bbrc.2012.07.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 07/07/2012] [Indexed: 01/10/2023]
Abstract
Dentin matrix protein 1 (DMP1) is highly expressed in odontoblasts and osteoblasts/osteocytes and plays an essential role in tooth and bone mineralization and phosphate homeostasis. It is debatable whether DMP1, in addition to its function in the extracellular matrix, can enter the nucleus and function as a transcription factor. To better understand its function, we examined the nuclear localization of endogenous and exogenous DMP1 in C3H10T1/2 mesenchymal cells, MC3T3-E1 preosteoblast cells and 17IIA11 odontoblast-like cells. RT-PCR analyses showed the expression of endogenous Dmp1 in all three cell lines, while Western-blot analysis detected a major DMP1 protein band corresponding to the 57 kDa C-terminal fragment generated by proteolytic processing of the secreted full-length DMP1. Immunofluorescent staining demonstrated that non-synchronized cells presented two subpopulations with either nuclear or cytoplasmic localization of endogenous DMP1. In addition, cells transfected with a construct expressing HA-tagged full-length DMP1 also showed either nuclear or cytoplasmic localization of the exogenous DMP1 when examined with an antibody against the HA tag. Furthermore, nuclear DMP1 was restricted to the nucleoplasm but was absent in the nucleolus. In conclusion, these findings suggest that, apart from its role as a constituent of dentin and bone matrix, DMP1 might play a regulatory role in the nucleus.
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Affiliation(s)
- Arwa Siyam
- Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M Health Science Center, 3302 Gaston Ave., Dallas, TX 75246-2013, United States
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95
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Napierala D, Sun Y, Maciejewska I, Bertin TK, Dawson B, D'Souza R, Qin C, Lee B. Transcriptional repression of the Dspp gene leads to dentinogenesis imperfecta phenotype in Col1a1-Trps1 transgenic mice. J Bone Miner Res 2012; 27:1735-45. [PMID: 22508542 PMCID: PMC3399940 DOI: 10.1002/jbmr.1636] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Dentinogenesis imperfecta (DGI) is a hereditary defect of dentin, a calcified tissue that is the most abundant component of teeth. Most commonly, DGI is manifested as a part of osteogenesis imperfecta (OI) or the phenotype is restricted to dental findings only. In the latter case, DGI is caused by mutations in the DSPP gene, which codes for dentin sialoprotein (DSP) and dentin phosphoprotein (DPP). Although these two proteins together constitute the majority of noncollagenous proteins of the dentin, little is known about their transcriptional regulation. Here we demonstrate that mice overexpressing the Trps1 transcription factor (Col1a1-Trps1 mice) in dentin-producing cells, odontoblasts, present with severe defects of dentin formation that resemble DGI. Combined micro-computed tomography (µCT) and histological analyses revealed tooth fragility due to severe hypomineralization of dentin and a diminished dentin layer with irregular mineralization in Col1a1-Trps1 mice. Biochemical analyses of noncollagenous dentin matrix proteins demonstrated decreased levels of both DSP and DPP proteins in Col1a1-Trps1 mice. On the molecular level, we demonstrated that sustained high levels of Trps1 in odontoblasts lead to dramatic decrease of Dspp expression as a result of direct inhibition of the Dspp promoter by Trps1. During tooth development Trps1 is highly expressed in preodontoblasts, but in mature odontoblasts secreting matrix its expression significantly decreases, which suggests a Trps1 role in odontoblast development. In these studies we identified Trps1 as a potent inhibitor of Dspp expression and the subsequent mineralization of dentin. Thus, we provide novel insights into mechanisms of transcriptional dysregulation that leads to DGI.
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Affiliation(s)
- Dobrawa Napierala
- Institute of Oral Health Research, Department of Oral and Maxillofacial Surgery, School of Dentistry, University of Alabama at Birmingham, Birmingham, AL 35294-0007, USA.
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96
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Wen Y, Wang F, Zhang W, Li Y, Yu M, Nan X, Chen L, Yue W, Xu X, Pei X. Application of induced pluripotent stem cells in generation of a tissue-engineered tooth-like structure. Tissue Eng Part A 2012; 18:1677-85. [PMID: 22676377 PMCID: PMC3419858 DOI: 10.1089/ten.tea.2011.0220] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 04/09/2012] [Indexed: 01/06/2023] Open
Abstract
Stem cells, such as adult stem cells or embryonic stem cells, are the most important seed cells employed in tooth tissue engineering. Even though dental-derived stem cells are a good source of seed cells for such procedures, they are not often used in clinical applications because of the limited supply. Induced pluripotent stem (iPS) cells, with their high proliferation and differentiation ability, are now considered a promising alternative. The objectives of this study were to assess the role of iPS cells in tooth tissue engineering. We used real-time polymerase chain reaction to confirm that mouse iPS (miPS) cells can be induced to express both odontogenic and osteogenic gene profiles. We then established a tooth germ model and transplanted the recombinant tooth germ into a mouse subrenal capsule for 4 weeks to reproduce early-tooth organogenesis. After 4 weeks, hematoxylin and eosin staining results showed newly formed bone-like and dental pulp-like areas. Further immunohistochemical staining confirmed that osteopontin was present in the apical part of the tooth-like structure. These results demonstrate that miPS cells have the potential to differentiate into odontogenic cells, confirming that they could be a new source of seed cells for use in tooth tissue engineering.
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Affiliation(s)
- Yong Wen
- School of Stomatology, Shandong University, Jinan, P.R. China
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
- Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, P.R. China
| | - Fang Wang
- School of Stomatology, Shandong University, Jinan, P.R. China
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
- Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, P.R. China
| | - Wencheng Zhang
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
| | - Yanhua Li
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
| | - Meijiao Yu
- School of Stomatology, Shandong University, Jinan, P.R. China
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
- Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, P.R. China
| | - Xue Nan
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
| | - Lin Chen
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
| | - Wen Yue
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
| | - Xin Xu
- School of Stomatology, Shandong University, Jinan, P.R. China
- Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, P.R. China
| | - Xuetao Pei
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, P.R. China
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97
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Orsini G, Ruggeri A, Mazzoni A, Nato F, Manzoli L, Putignano A, Di Lenarda R, Tjäderhane L, Breschi L. A review of the nature, role, and function of dentin non-collagenous proteins. Part 1: proteoglycans and glycoproteins. ACTA ACUST UNITED AC 2012. [DOI: 10.1111/j.1601-1546.2012.00270.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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98
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Malhotra N, Mala K. Regenerative endodontics as a tissue engineering approach: Past, current and future. AUST ENDOD J 2012; 38:137-48. [DOI: 10.1111/j.1747-4477.2012.00355.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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99
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Izumikawa M, Hayashi K, Polan MAA, Tang J, Saito T. Effects of amelogenin on proliferation, differentiation, and mineralization of rat bone marrow mesenchymal stem cells in vitro. ScientificWorldJournal 2012; 2012:879731. [PMID: 22547998 PMCID: PMC3322511 DOI: 10.1100/2012/879731] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 10/20/2011] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to clarify the function of amelogenin, the major protein of enamel matrix derivative, on the proliferation, differentiation, and mineralization of cultured rat bone marrow stem cells (BMSCs), toward the establishment of future bone regenerative therapies. No differences in the morphology of BMSCs or in cell numbers were found between amelogenin addition and additive-free groups. The promotion of ALPase activity and the formation of mineralized nodules were detected at an early stage in amelogenin addition group. In quantitative real-time RT-PCR, mRNA expression of osteopontin, osteonectin, and type I collagen was promoted for 0.5 hours and 24 hours by addition of amelogenin. The mRNA expression of osteocalcin and DMP-1 was also stimulated for 24 hours and 0.5 hours, respectively, in amelogenin addition group. These findings clearly indicate that amelogenin promoted the differentiation and mineralization of rat BMSCs but did not affect cell proliferation or cell morphology.
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Affiliation(s)
- Masanobu Izumikawa
- Division of Clinical Cariology and Endodontology, Department of Oral Rehabilitation, School of Dentistry, Health Sciences University of Hokkaido, 1757 Tobetsu, Hokkaido 061-0293, Japan
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100
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Pereira LB, Chimello DT, Ferreira MRW, Bachmann L, Rosa AL, Bombonato-Prado KF. Low-level laser therapy influences mouse odontoblast-like cell response in vitro. Photomed Laser Surg 2012; 30:206-13. [PMID: 22375953 DOI: 10.1089/pho.2011.3087] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE The purpose of this study was to analyze the influence of two different irradiation times with 85 mW/cm(2) 830 nm laser on the behavior of mouse odontoblast-like cells. BACKGROUND DATA The use of low-level laser therapy (LLLT) to stimulate pulp tissue is a reality, but few reports relate odontoblastic responses to irradiation in in vitro models. METHODS Odontoblast-like cells (MDPC-23) were cultivated and divided into three groups: control/nonirradiated (group 1); or irradiated with 85 mW/cm(2), 830 nm laser for 10 sec (0.8 J/cm(2)) (group 2); or for 50 sec (4.2 J/cm(2)) (group 3) with a wavelength of 830 nm. After 3, 7, and 10 days, it was analyzed: growth curve and cell viability, total protein content, alkaline phosphatase (ALP) activity, calcified nodules detection and quantification, collagen immunolocalization, vascular endothelial growth factor (VEGF) expression, and real-time polymerase chain reaction (PCR) for DMP1 gene. Data were analyzed by Kruskall-Wallis test (α=0.05). RESULTS Cell growth was smaller in group 2 (p<0.01), whereas viability was similar in all groups and at all periods. Total protein content and ALP activity increased on the 10th day with 0.8 J/cm(2) (p<0.01), as well as the detection and quantification of mineralization nodules (p<0.05), collagen, and VEGF expression (p<0.01). The expression of DMP1 increased in all groups (p<0.05) compared with control at 3 days, except for 0.8 J/cm(2) at 3 days and control at 10 days. CONCLUSIONS LLLT influenced the behavior of odontoblast-like cells; the shorter time/smallest energy density promoted the expression of odontoblastic phenotype in a more significant way.
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Affiliation(s)
- Luciana Batista Pereira
- School of Dentistry of Ribeirão Preto, Cell Culture Laboratory-Department of Morphology, Stomatology and Physiology, University of São Paulo, Ribeirão Preto, SP, Brazil
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