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Nogueira-Júnior V, Sousa FRN, da S M Rebouças C, Braz HLB, Dos S Morais MLG, Goes P, de C Brito GA, Jorge RJB, Barbosa FG, Mafezoli J, Silva-Filho CJA, de O Capistrano AL, Bezerra MM, de C Leitão RF. Exploring the osteogenic potential of semisynthetic triterpenes from Combretum leprosum: An in vitro and in silico study. In Vitro Cell Dev Biol Anim 2024:10.1007/s11626-024-00928-w. [PMID: 38992216 DOI: 10.1007/s11626-024-00928-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 05/13/2024] [Indexed: 07/13/2024]
Abstract
Combretum leprosum Mart. is a plant of the Combretaceae family, widely distributed in the Northeast region of Brazil, popularly used as an anti-inflammatory agent, and rich in triterpenes. This study evaluated in vitro and in silico potential osteogenic of two semisynthetic triterpenes (CL-P2 and CL-P2A) obtained from the pentacyclic triterpene 3β,6β,16β-trihydroxylup-20(29)-ene (CL-1) isolated from C. leprosum. Assays were carried out in cultured murine osteoblasts (OFCOL II), first investigating the possible toxicity of the compounds on these cells through viability assays (MTT). Cell proliferation and activation were investigated by immunohistochemical evaluation of Ki-67, bone alkaline phosphatase (ALP) activity, and mineralization test by Von Kossa. Molecular docking analysis was performed to predict the binding affinity of CL-P2 and CL-P2A to target proteins involved in the regulation of osteogenesis, including: bone morphogenetic protein 2 (BMP-2), proteins related to Wingless-related integration (WNT) pathway (Low-density lipoprotein receptor-related protein 6-LRP6 and sclerostin-SOST), and receptor activator of nuclear factor (NF)-kB-ligand (RANK-L). Next, Western Blot and immunofluorescence investigated BMP-2, WNT, RANK-L, and OPG protein expressions in cultured murine osteoblasts (OFCOL II). None of the CL-P2 and CL-P2A concentrations were toxic to osteoblasts. Increased cell proliferation, ALP activity, and bone mineralization were observed. Molecular docking assays demonstrated interactions with BMP-2, LRP6, SOST, and RANK-L/OPG. There was observed increased expression of BMP-2, WNT, and RANK-L/OPG proteins. These results suggest, for the first time, the osteogenic potential of CL-P2 and CL-P2A.
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Affiliation(s)
- Valdo Nogueira-Júnior
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Fátima Regina N Sousa
- Department of Morphology, Medical School, Federal University of Piaui, Picos, Piauí, Brazil
| | - Conceição da S M Rebouças
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Helyson L B Braz
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Maria Luana G Dos S Morais
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Paula Goes
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Gerly Anne de C Brito
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Roberta Jeane B Jorge
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Francisco Geraldo Barbosa
- Department of Organic and Inorganic Chemistry, Science Centre, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Jair Mafezoli
- Department of Organic and Inorganic Chemistry, Science Centre, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Carlos José A Silva-Filho
- Department of Organic and Inorganic Chemistry, Science Centre, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - André Luiz de O Capistrano
- Department of Organic and Inorganic Chemistry, Science Centre, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Mirna M Bezerra
- Postgraduate Program in Health Sciences, School of Medicine, Federal University of Ceará, Sobral, Ceará, Brazil.
| | - Renata F de C Leitão
- Postgraduate Program in Morphofunctional Sciences, Department of Morphology, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
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Nasiri K, Jahri M, Kolahdouz S, Soleimani M, Makiya A, Saini RS, Merza MS, Yasamineh S, Banakar M, Yazdanpanah MH. MicroRNAs Function in Dental Stem Cells as a Promising Biomarker and Therapeutic Target for Dental Diseases. Mol Diagn Ther 2023; 27:703-722. [PMID: 37773247 DOI: 10.1007/s40291-023-00675-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/23/2023] [Indexed: 10/01/2023]
Abstract
Undifferentiated, highly proliferative, clonogenic, and self-renewing dental stem cells have paved the way for novel approaches to mending cleft palates, rebuilding lost jawbone and periodontal tissue, and, most significantly, recreating lost teeth. New treatment techniques may be guided by a better understanding of these cells and their potential in terms of the specificity of the regenerative response. MicroRNAs have been recognized as an essential component in stem cell biology due to their role as epigenetic regulators of the processes that determine stem cell destiny. MicroRNAs have been proven to be crucial in a wide variety of molecular and biological processes, including apoptosis, cell proliferation, migration, and necrocytosis. MicroRNAs have been recognized to control protein translation, messenger RNA stability, and transcription and have been reported to play essential roles in dental stem cell biology, including the differentiation of dental stem cells, the immunological response, apoptosis, and the inflammation of the dental pulp. Because microRNAs increase dental stem cell differentiation, they may be used in regenerative medicine to either preserve the stem cell phenotype or to aid in the development of tooth tissue. The development of novel biomarkers and therapies for dental illnesses relies heavily on progress made in our knowledge of the roles played by microRNAs in regulating dental stem cells. In this article, we discuss how dental stem cells and their associated microRNAs may be used to cure dental illness.
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Affiliation(s)
- Kamyar Nasiri
- Department of Dentistry, Islamic Azad University, Tehran, Iran
| | - Mohammad Jahri
- Dental Research Center, School of Dentistry, Shahid Beheshti, Research Institute of Dental Sciences, University of Medical Sciences, Tehran, Iran
| | | | | | - Ali Makiya
- Student Research Committee, Faculty of Dentistry, Mashhad University of Medical Science, Mashhad, Iran
| | - Ravinder S Saini
- COAMS, King Khalid University, Abha, 62529, Kingdom of Saudi Arabia
| | - Muna S Merza
- Prosthetic Dental Techniques Department, Al-Mustaqbal University College, Babylon, 51001, Iraq
| | - Saman Yasamineh
- Young Researchers and Elite Club, Tabriz Branch, Islamic Azad University, Tabriz, Iran
| | - Morteza Banakar
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
- Department of Pediatric Dentistry, Faculty of Dentistry, Shahed University, Tehran, Iran.
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Energy Metabolism and Lipidome Are Highly Regulated during Osteogenic Differentiation of Dental Follicle Cells. Stem Cells Int 2022; 2022:3674931. [PMID: 35903407 PMCID: PMC9315453 DOI: 10.1155/2022/3674931] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/14/2022] [Accepted: 06/30/2022] [Indexed: 11/18/2022] Open
Abstract
Dental follicle cells (DFCs) are stem/progenitor cells of the periodontium and give rise to alveolar osteoblasts. However, understanding of the molecular mechanisms of osteogenic differentiation, which is required for cell-based therapies, is delimited. This study is aimed at analyzing the energy metabolism during the osteogenic differentiation of DFCs. Human DFCs were cultured, and osteogenic differentiation was induced by either dexamethasone or bone morphogenetic protein 2 (BMP2). Previous microarray data were reanalyzed to examine pathways that are regulated after osteogenic induction. Expression and activity of metabolic markers were evaluated by western blot analysis and specific assays, relative amount of mitochondrial DNA was measured by real-time quantitative polymerase chain reaction, the oxidative state of cells was determined by a glutathione assay, and the lipidome of cells was analyzed via mass spectrometry (MS). Moreover, osteogenic markers were analyzed after the inhibition of fatty acid synthesis by 5-(tetradecyloxy)-2-furoic acid or C75. Pathway enrichment analysis of microarray data revealed that carbon metabolism was amongst the top regulated pathways after osteogenic induction in DFCs. Further analysis showed that enzymes involved in glycolysis, citric acid cycle, mitochondrial activity, and lipid metabolism are differentially expressed during differentiation, with most markers upregulated and more markedly after induction with dexamethasone compared to BMP2. Moreover, the cellular state was more oxidized, and mitochondrial DNA was distinctly upregulated during the second half of differentiation. Besides, MS of the lipidome revealed higher lipid concentrations after osteogenic induction, with a preference for species with lower numbers of C-atoms and double bonds, which indicates a de novo synthesis of lipids. Concordantly, inhibition of fatty acid synthesis impeded the osteogenic differentiation of DFCs. This study demonstrates that energy metabolism is highly regulated during osteogenic differentiation of DFCs including changes in the lipidome suggesting enhanced de novo synthesis of lipids, which are required for the differentiation process.
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Pieles O, Reichert TE, Morsczeck C. Protein kinase A is activated during bone morphogenetic protein 2-induced osteogenic differentiation of dental follicle stem cells via endogenous parathyroid hormone-related protein. Arch Oral Biol 2022; 138:105409. [PMID: 35338829 DOI: 10.1016/j.archoralbio.2022.105409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 03/07/2022] [Accepted: 03/13/2022] [Indexed: 12/26/2022]
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Mohanarangam S, Victor DJ, Subramanian S, Prakash P. The influence of periostin on osteoblastic adhesion and proliferation on collagen matrices - An in vitro study. J Indian Soc Periodontol 2021; 25:480-484. [PMID: 34898912 PMCID: PMC8603795 DOI: 10.4103/jisp.jisp_396_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 01/26/2021] [Accepted: 02/09/2021] [Indexed: 11/15/2022] Open
Abstract
Purpose: The purpose of the study was to evaluate the ability of periostin when impregnated onto varied collagen matrices to influence osteoblast cell adhesion, proliferation, and activity. Materials and Methods: Saos-2 osteoblast cells were cultured and seeded onto two different collagen matrices as follows: Group A: absorbable collagen sponge (ACS), Group B: ACS impregnated with recombinant human periostin, Group C: nanocrystalline hydroxyapatite collagen (NcHC), and Group D: NcHC impregnated with recombinanant human periostin. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay was performed to evaluate cell viability as well as adhesion and proliferation on 2nd, 5th, and 7th day. Osteoblast activity was studied using alkaline phosphatase (ALP) assay for the study groups. Results: The periostin-treated absorbable collagen matrices showed a statistically significant increase in the osteoblast adhesion compared to periostin-treated NcHC on days 2, 5, and 7 (P < 0.001). The osteoblast activity as evaluated by ALP assay showed that there is increased activity in the periostin-treated ACS compared to the periostin-treated NcHC. Conclusion: From the observations of this study, it is evident that Periostin has a significant role in the modulating cellular response of the osteoblast cells. Further, incorporation of periostin into the ACS has been shown to increase the cell viability, proliferation, and adhesion of osteoblast-like Saos-2 cells.
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Affiliation(s)
| | - Dhayanand John Victor
- Department of Periodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Sangeetha Subramanian
- Department of Periodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Psg Prakash
- Department of Periodontics, SRM Dental College and Hospital, Chennai, Tamil Nadu, India
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Toda Nakamura M, Zhang H, Guo D, Ueharu H, Pan H, Scott G, Harris M, Ray M, Feng JQ, Harris SE, Bonewald LF, Mishina Y. Podoplanin is dispensable for mineralized tissue formation and maintenance in the Swiss outbred mouse background. Genesis 2021; 59:e23450. [PMID: 34487426 DOI: 10.1002/dvg.23450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 08/25/2021] [Accepted: 08/26/2021] [Indexed: 11/07/2022]
Abstract
Podoplanin, PDPN, is a mucin-type transmembrane glycoprotein widely expressed in many tissues, including lung, kidney, lymph nodes, and mineralized tissues. Its function is critical for lymphatic formation, differentiation of type I alveolar epithelial lung cells, and for bone response to biomechanical loading. It has previously been shown that Pdpn null mice die at birth due to respiratory failure emphasizing the importance of Pdpn in alveolar lung development. During the course of generation of Pdpn mutant mice, we found that most Pdpn null mice in the 129S6 and C57BL6/J mixed genetic background die at the perinatal stage, similar to previously published studies with Pdpn null mice, while all Pdpn null mice bred with Swiss outbred mice survived. Surviving mutant mice in the 129S6 and C57BL6/J mixed genetic background showed alterations in the osteocyte lacunocanalicular network, especially reduced osteocyte canaliculi in the tibial cortex with increased tibial trabecular bone. However, adult Pdpn null mice in the Swiss outbred background showed no overt differences in their osteocyte lacunocnalicular network, bone density, and no overt differences when challenged with exercise. Together, these data suggest that genetic variations present in the Swiss outbred mice compensate for the loss of function of PDPN in lung, kidney, and bone.
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Affiliation(s)
- Masako Toda Nakamura
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA.,Section of Pediatric Dentistry, Department of Oral Growth and Development, Fukuoka Dental College, Fukuoka, Japan
| | - Honghao Zhang
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Dayong Guo
- Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas City, Missouri, USA
| | - Hiroki Ueharu
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Haichun Pan
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
| | - Greg Scott
- Knock Out Core, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Marie Harris
- Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas City, Missouri, USA.,UT Health San Antonio, Graduate School of Biomedical Sciences, San Antonio, Texas, USA
| | - Manas Ray
- Knock Out Core, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Jiang Q Feng
- Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas City, Missouri, USA.,Department of Biomedical Sciences, Texas A&M College of Dentistry, Dallas, Texas, USA
| | - Stephen E Harris
- Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas City, Missouri, USA.,UT Health San Antonio, Graduate School of Biomedical Sciences, San Antonio, Texas, USA
| | - Lynda F Bonewald
- Department of Oral Biology, School of Dentistry, University of Missouri-Kansas City, Kansas City, Missouri, USA.,Indiana Center for Musculoskeletal Health and Department of Anatomy, Cell Biology and Physiology, Indiana University, Indianapolis, Indiana, USA
| | - Yuji Mishina
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan, USA
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Kongthitilerd P, Sharma A, Guidry HE, Rong W, Nguyen J, Yao S, Adisakwattana S, Cheng H. Antidiuretic hormone inhibits osteogenic differentiation of dental follicle stem cells via V1a receptors and the PLC-IP 3 pathway. Arch Oral Biol 2021; 128:105169. [PMID: 34058720 DOI: 10.1016/j.archoralbio.2021.105169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 05/16/2021] [Accepted: 05/25/2021] [Indexed: 11/18/2022]
Abstract
OBJECTIVE The aim of this study was to elucidate the molecular mechanism by which antidiuretic hormone (ADH) inhibited osteogenesis in dental follicle stem cells. DESIGN Rat dental follicle stem cells were cultured in osteogenic differentiation medium supplemented with ADH. Alkaline phosphatase enzyme activity, Alizarin Red S staining, MTT assay and RT-qPCR was used to examine ADH's impact on cell mineralization, viability, and osteogenic gene expression. Real-time calcium imaging analysis was performed to identify the ADH receptor and its mechanism of action. RESULTS ADH supplementation to the osteogenic differentiation medium inhibited cell mineralization without compromising cell viability and downregulated the expression of key osteogenic genes: DCN (Decorin), RUNX2 (Runt-related transcription factor 2) and BSP (Bone sialoprotein). Real-time calcium imaging analysis revealed that ADH (1-1000 nM) increased intracellular calcium in a concentration-dependent manner. Pretreatment of cells with V2255, a V1a receptor blocker, inhibited the calcium signals, but not with the V1b (Nelivaptan) or V2 (Tolvaptan). V2255 also reversed the inhibitory effect of ADH on osteogenesis. Furthermore, U73122, a Phospholipase C (PLC) inhibitor, 2-APB, an Inositol Triphosphate (IP3) receptor blocker, and depletion of endoplasmic reticulum calcium stores abolished the calcium signals by ADH. CONCLUSIONS Our results demonstrated that ADH activates V1a receptors and the PLC-IP3 pathway to stimulate intracellular calcium signals, which inhibits cell mineralization and osteogenic gene expression. These findings uncovered a novel function for ADH as a negative regulator of osteogenesis in dental follicle stem cells. The role of ADH in the pathogenesis of bone diseases remains to be determined.
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Affiliation(s)
- P Kongthitilerd
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA; Interdisciplinary Program of Biomedical Sciences, Graduate School, Chulalongkorn University, Bangkok, 10330, Thailand
| | - A Sharma
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - H E Guidry
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - W Rong
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - J Nguyen
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - S Yao
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - S Adisakwattana
- Phytochemical and Functional Food Research Unit for Clinical Nutrition, Department of Nutrition and Dietetics, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand
| | - H Cheng
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, 70803, USA.
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E LL, Zhang R, Li CJ, Zhang S, Ma XC, Xiao R, Liu HC. Effects of rhBMP-2 on Bone Formation Capacity of Rat Dental Stem/Progenitor Cells from Dental Follicle and Alveolar Bone Marrow. Stem Cells Dev 2021; 30:441-457. [PMID: 33798004 DOI: 10.1089/scd.2020.0170] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Dental stem/progenitor cells are a promising cell sources for alveolar bone (AB) regeneration because of their same embryonic origin and superior osteogenic potential. However, their molecular processes during osteogenic differentiation remain unclear. The objective of this study was to identify the responsiveness of dental follicle cells (DFCs) and AB marrow-derived mesenchymal stem cells (ABM-MSCs) to recombinant human bone morphogenetic protein-2 (rhBMP-2). These cells expressed vimentin and MSC markers and did not express cytokeratin and hematopoietic stem cell markers and showed multilineage differentiation potential under specific culture conditions. DFCs exhibited higher proliferation and colony-forming unit-fibroblast efficiency than ABM-MSCs; rhBMP-2 induced DFCs to differentiate toward a cementoblast/osteoblast phenotype and ABM-MSCs to differentiate only toward a osteoblast phenotype; and rhBMP-2-induced DFCs exhibited higher osteogenic differentiation potential than ABM-MSCs. These cells adhered, grew, and produced extracellular matrix on nanohydroxyapatite/collagen/poly(l-lactide) (nHAC/PLA). During a 14-day culture on nHAC/PLA, the extracellular alkaline phosphatase (ALP) activity of DFCs decreased gradually and that of ABM-MSCs increased gradually; rhBMP-2 enhanced their extracellular ALP activity, intracellular osteocalcin (OCN), and osteopontin (OPN) protein expression; and DFCs exhibited higher extracellular ALP activity and intracellular OCN protein expression than ABM-MSCs. When implanted subcutaneously in severe combined immunodeficient mice for 3 months, DFCs+nHAC/PLA+rhBMP-2 obtained higher percentage of bone formation area, OCN, and cementum attachment protein expression and lower OPN expression than ABM-MSCs+nHAC/PLA+rhBMP-2. These results showed that DFCs possessed superior proliferation and osteogenic differentiation potential in vitro, and formed higher quantity and quality bones in vivo. It suggested that DFCs might exhibit a more sensitive responsiveness to rhBMP-2, so that DFCs enter a relatively mature stage of osteogenic differentiation earlier than ABM-MSCs after rhBMP-2 induction. The findings imply that these dental stem/progenitor cells are alternative sources for AB engineering in regenerative medicine, and developing dental tissue may provide better source for stem/progenitor cells.
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Affiliation(s)
- Ling-Ling E
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Rong Zhang
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Chuan-Jie Li
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Shuo Zhang
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Xiao-Cao Ma
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Rui Xiao
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Hong-Chen Liu
- Institute of Stomatology, First Medical Center of Chinese PLA General Hospital, Beijing, China
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9
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Bashir NZ. The role of insulin-like growth factors in modulating the activity of dental mesenchymal stem cells. Arch Oral Biol 2020; 122:104993. [PMID: 33259987 DOI: 10.1016/j.archoralbio.2020.104993] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/14/2020] [Accepted: 11/19/2020] [Indexed: 12/27/2022]
Abstract
Regenerative treatment protocols are an exciting prospect in the management of oral pathology, as they allow for tissues to be restored to their original form and function, as compared to the reparative healing mechanisms which currently govern the outcomes of the majority of dental treatment. Stem cell therapy presents with a great deal of untapped potential in this pursuit of tissue regeneration, and, in particular, mesenchymal stem cells (MSCs) derived from dental tissues are of specific relevance with regards to their applications in engineering craniofacial tissues. A number of mediatory factors are involved in modulating the actions of dental MSCs, and, of these, insulin like growth factors (IGFs) are known to have potent effects in governing the behavior of these cells. The IGF family comprises a number of primary ligands, receptors, and binding proteins which are known to modulate the key properties of dental MSCs, such as their proliferation rates, differentiation potential, and mineralisation. The aims of this review are three-fold: (i) to present an overview of dental MSCs and the role of growth factors in modulating their characteristics, (ii) to discuss in greater detail the specific role of IGFs and the benefits they may convey for tissue engineering, and (iii) to provide a summary of potential for in vivo clinical translation of the current in vitro body of evidence.
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10
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Therapeutic Functions of Stem Cells from Oral Cavity: An Update. Int J Mol Sci 2020; 21:ijms21124389. [PMID: 32575639 PMCID: PMC7352407 DOI: 10.3390/ijms21124389] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/14/2020] [Accepted: 06/17/2020] [Indexed: 12/11/2022] Open
Abstract
Adult stem cells have been developed as therapeutics for tissue regeneration and immune regulation due to their self-renewing, differentiating, and paracrine functions. Recently, a variety of adult stem cells from the oral cavity have been discovered, and these dental stem cells mostly exhibit the characteristics of mesenchymal stem cells (MSCs). Dental MSCs can be applied for the replacement of dental and oral tissues against various tissue-damaging conditions including dental caries, periodontitis, and oral cancers, as well as for systemic regulation of excessive inflammation in immune disorders, such as autoimmune diseases and hypersensitivity. Therefore, in this review, we summarized and updated the types of dental stem cells and their functions to exert therapeutic efficacy against diseases.
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11
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Tang J, Qing MF, Li M, Gao Z. Dexamethasone inhibits BMP7-induced osteogenic differentiation in rat dental follicle cells via the PI3K/AKT/GSK-3β/β-catenin pathway. Int J Med Sci 2020; 17:2663-2672. [PMID: 33162794 PMCID: PMC7645344 DOI: 10.7150/ijms.44231] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 08/29/2020] [Indexed: 02/05/2023] Open
Abstract
Impacted third molars are commonly seen in teenagers and young adults and can cause considerable suffering. Preventing eruption of the third molars can reduce pain at the source. Our previous study has shown that dexamethasone (DEX) at a certain concentration can prevent the eruption of third molars without damaging alveolar bone in Sprague-Dawley (SD) rats, but the relevant molecular mechanisms need to be explored. This study aimed to explore the effects of high concentrations of DEX on osteogenic signaling pathways, including BMP/Smad and Wnt/β-catenin pathways, in rat dental follicle cells (rDFCs) and to elucidate the possible mechanisms. The results showed that BMP7 induced osteogenic differentiation by increasing the activity of ALP and the protein levels of OPN in rDFCs. DEX decreased endogenous BMP7 and phosphorylated Smad1/5/8 expression as well as BMP7-induced osteogenic differentiation. DEX also reduced the mRNA and protein levels of β-catenin by enhancing the expression of GSK-3β. In addition, regardless of DEX intervention, overexpression of BMP7 promoted the expression of β-catenin, while knockdown of BMP7 attenuated it. Further investigation revealed that overexpression of BMP7 attenuated the DEX-mediated inhibition of AKT and GSK-3β phosphorylation, but knockdown of BMP7 exerted the opposite effects. This study suggests that high concentrations of DEX may inhibit the expression of β-catenin via the PI3K/AKT/GSK-3β pathway in a manner mediated by BMP7. The findings further illustrate the possible molecular mechanisms by which DEX prevents tooth development.
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Affiliation(s)
- Jing Tang
- Department of Stomatology, The Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Yuzhong District, Chongqing 400010, P.R. China.,Chongqing Key Laboratory of Oral Disease and Biomedical Sciences, 426 North Songshi Road, Yubei District, Chongqing 401147, P.R. China
| | - Mao-Feng Qing
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, Sec. 3, Renminnan Road, 610041 Chengdu, Sichuan, P.R. China
| | - Min Li
- Department of Stomatology, The Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Yuzhong District, Chongqing 400010, P.R. China.,Chongqing Key Laboratory of Oral Disease and Biomedical Sciences, 426 North Songshi Road, Yubei District, Chongqing 401147, P.R. China
| | - Zhi Gao
- Department of Stomatology, The Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Yuzhong District, Chongqing 400010, P.R. China
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Dental Follicle Cells: Roles in Development and Beyond. Stem Cells Int 2019; 2019:9159605. [PMID: 31636679 PMCID: PMC6766151 DOI: 10.1155/2019/9159605] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Accepted: 08/16/2019] [Indexed: 02/05/2023] Open
Abstract
Dental follicle cells (DFCs) are a group of mesenchymal progenitor cells surrounding the tooth germ, responsible for cementum, periodontal ligament, and alveolar bone formation in tooth development. Cascades of signaling pathways and transcriptional factors in DFCs are involved in directing tooth eruption and tooth root morphogenesis. Substantial researches have been made to decipher multiple aspects of DFCs, including multilineage differentiation, senescence, and immunomodulatory ability. DFCs were proved to be multipotent progenitors with decent amplification, immunosuppressed and acquisition ability. They are able to differentiate into osteoblasts/cementoblasts, adipocytes, neuron-like cells, and so forth. The excellent properties of DFCs facilitated clinical application, as exemplified by bone tissue engineering, tooth root regeneration, and periodontium regeneration. Except for the oral and maxillofacial regeneration, DFCs were also expected to be applied in other tissues such as spinal cord defects (SCD), cardiomyocyte destruction. This article reviewed roles of DFCs in tooth development, their properties, and clinical application potentials, thus providing a novel guidance for tissue engineering.
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13
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Bai SY, Chen Y, Dai HW, Huang L. [Effect of sclerostin on the functions and related mechanisms of cementoblasts under mechanical stress]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2019; 37:162-167. [PMID: 31168982 DOI: 10.7518/hxkq.2019.02.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVE The purpose of this study is to investigate the potential effects of sclerostin (SOST) on the biological funtions and related mechanisms of cementoblasts under mechanical stress. METHODS OCCM-30 cells were treated with varying doses of SOST (0, 25, 50, and 100 ng·mL⁻¹) and were loaded with uniaxial compressive stress (2 000 μ strain with a frequency of 0.5 Hz) for six hours. Western blot was utilized to detect the expressions of β-catenin, p-smad1/5/8, and smad1/5/8 proteins. Alkaline phosphatase (ALP) activity was determined, and reverse transcription polymerase chain reaction was used to measure the expressions of runt-related transcription factor 2 (Runx-2), osteocalcin (OCN), bone sialoproteins (BSP), receptor activator of NF-κB ligand (RANKL) and osteoprotegerin (OPG) mRNA. RESULTS The expression of p-smad
1/5/8 was significantly downregulated with increasing SOST. β-catenin and smad1/5/8 exhibited no difference. ALP activity decreased under mechanical compressive stress with increasing SOST concentrations. Runx-2 expression was reduced with increasing SOST concentrations, and a similar trend was observed for the BSP and OCN expressions. When the SOST concentration was enhanced, RANKL expression gradually increased, whereas the expression of OPG decreased. CONCLUSIONS Under mechanical comprehensive stress, SOST can adjust the bone morphogenetic protein (BMP) /smad signal pathway. Osteosclerosis inhibits the mineralization of cementoblasts under mechanical compressive stress, which may be achieved by inhibiting the expressions of osteogenesis factors (Runx2, OCN, BSP, and others) and by promoting the ratio of cementoclast-related factors (RANKL/OPG) through BMP signal pathways.
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Affiliation(s)
- Si-Yu Bai
- Dept. of Orthodontics, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Yue Chen
- Dept. of Orthodontics, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Hong-Wei Dai
- Dept. of Orthodontics, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
| | - Lan Huang
- Dept. of Orthodontics, Stomatological Hospital of Chongqing Medical University, Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
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14
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Zhang J, Ding H, Liu X, Sheng Y, Liu X, Jiang C. Dental Follicle Stem Cells: Tissue Engineering and Immunomodulation. Stem Cells Dev 2019; 28:986-994. [PMID: 30968740 DOI: 10.1089/scd.2019.0012] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Jie Zhang
- Department of Orthodontics, the Affiliated Hospital of Qingdao University; School of Stomatology, Qingdao University, Qingdao, China
| | - Hong Ding
- Department of Orthodontics, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xinfeng Liu
- Department of Nuclear Medicine, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yunfei Sheng
- Department of Orthodontics, the Affiliated Hospital of Qingdao University; School of Stomatology, Qingdao University, Qingdao, China
| | - Xinqiang Liu
- Department of Orthodontics, the Affiliated Hospital of Qingdao University; School of Stomatology, Qingdao University, Qingdao, China
| | - Chunmiao Jiang
- Department of Orthodontics, the Affiliated Hospital of Qingdao University; School of Stomatology, Qingdao University, Qingdao, China
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15
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Effect of Fluoride Doping in Laponite Nanoplatelets on Osteogenic Differentiation of Human Dental Follicle Stem Cells (hDFSCs). Sci Rep 2019; 9:915. [PMID: 30696860 PMCID: PMC6351553 DOI: 10.1038/s41598-018-37327-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 12/04/2018] [Indexed: 01/12/2023] Open
Abstract
Bioactive nanosilicates are emerging prominent next generation biomaterials due to their intrinsic functional properties such as advanced biochemical and biophysical cues. Recent studies show interesting dose-dependent effect of fluoride ions on the stem cells. Despite of interesting properties of fluoride ions as well as nanosilicate, there is no reported literature on the effect of fluoride-doped nanosilicates on stem cells. We have systematically evaluated the interaction of fluoride nanosilicate platelets (NS + F) with human dental follicle stem cells (hDFSCs) to probe the cytotoxicity, cellular transport (internalization) and osteogenic differentiation capabilities in comparison with already reported nanosilicate platelets without fluoride (NS − F). To understand the osteoinductive and osteoconductive properties of the nanosilicate system, nanosilicate treated hDFSCs are cultured in three different medium namely normal growth medium, osteoconductive medium, and osteoinductive medium up to 21 d. NS + F treated stem cells show higher ALP activity, osteopontin levels and significant alizarin red staining compared to NS − F treated cells. This study highlights that the particles having fluoride additives (NS + F) aid in enhancing the osteogenic differentiation capabilities of hDFSCs thus potential nanobiomaterial for periodontal bone tissue regeneration.
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16
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Controllable and durable release of BMP-2-loaded 3D porous sulfonated polyetheretherketone (PEEK) for osteogenic activity enhancement. Colloids Surf B Biointerfaces 2018; 171:668-674. [DOI: 10.1016/j.colsurfb.2018.08.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 08/02/2018] [Accepted: 08/07/2018] [Indexed: 01/07/2023]
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17
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Kanaya S, Xiao B, Sakisaka Y, Suto M, Maruyama K, Saito M, Nemoto E. Extracellular calcium increases fibroblast growth factor 2 gene expression via extracellular signal-regulated kinase 1/2 and protein kinase A signaling in mouse dental papilla cells. J Appl Oral Sci 2018; 26:e20170231. [PMID: 29768523 PMCID: PMC5961930 DOI: 10.1590/1678-7757-2017-0231] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 11/20/2017] [Indexed: 11/21/2022] Open
Abstract
We previously reported that elevated extracellular calcium (Ca2+) levels increase bone morphogenetic protein 2 expression in human dental pulp (hDP) cells. However, it is unknown whether extracellular Ca2+ affects the expression of other growth factors such as fibroblast growth factor 2 (FGF2).
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Affiliation(s)
- Sousuke Kanaya
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan.,Tohoku University, Graduate School of Dentistry, Liaison Center for Innovative Dentistry, Sendai, Japan
| | - Binlu Xiao
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan
| | - Yukihiko Sakisaka
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan
| | - Mizuki Suto
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan
| | - Kentaro Maruyama
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan
| | - Masahiro Saito
- Tohoku University, Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Sendai, Japan
| | - Eiji Nemoto
- Tohoku University, Graduate School of Dentistry, Department of Periodontology and Endodontology, Sendai, Japan
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18
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Harmine promotes molar root development via SMAD1/5/8 phosphorylation. Biochem Biophys Res Commun 2018; 497:924-929. [DOI: 10.1016/j.bbrc.2017.12.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 12/12/2017] [Indexed: 11/16/2022]
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19
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Zuo C, Zhao X, Shi Y, Wu W, Zhang N, Xu J, Wang C, Hu G, Zhang X. TNF-α inhibits SATB2 expression and osteoblast differentiation through NF-κB and MAPK pathways. Oncotarget 2017; 9:4833-4850. [PMID: 29435145 PMCID: PMC5797016 DOI: 10.18632/oncotarget.23373] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 12/04/2017] [Indexed: 11/25/2022] Open
Abstract
Although the mechanisms of Tumor necrosis factor alpha (TNF-α) on facilitating osteoclast differentiation and bone resorption is well known, the mechanisms behind the suppression of the osteoblast differentiation from mesenchymal stem cells (MSCs) are still poorly understood. In this study, we observed a negative correlation between TNF-α levels and the expression of special AT-rich sequence-binding protein 2 (SATB2), a critical osteoblastogenesis transcription factor, in ovariectomy (OVX)-induced bone loss and IL-1-induced arthritis animal model. We found that TNF-α treatment inhibited mesenchymal cell line C2C12 osteoblast differentiation and sharply decreased BMP2-induced SATB2 expression. Upon TNF-α treatment, the activity of smad1/5/8 was inhibited, by contrast, extracellular signal-regulated kinase-1/2 (ERK1/2) and P38 was increased in C2C12 cells, the inhibitor of ERK1/2 (U0126) was found to abrogate the TNF-α inhibition of SATB2 expression. Furthermore, the NF-κB signaling pathway in C2C12 cells was significantly activated by the treatment of TNF-α, and TNF-α induced NF-κB directly binds to SATB2 promoter to suppress its expression. These results suggest that TNF-α suppresses SATB2 expression through activating NF-κB and MAPK signaling and depressing smad1/5/8 signaling, which contributes to the inhibition of osteoblast differentiation and might be potential therapeutic targets for inflammation-induced bone loss.
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Affiliation(s)
- Chijian Zuo
- Department of Orthopedic Surgery, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China.,The Key Laboratory of Stem Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
| | - Xiaoying Zhao
- Department of Orthopedic Surgery, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China
| | - Yu Shi
- The Key Laboratory of Stem Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
| | - Wen Wu
- Shanghai Key Laboratory of Orthopaedic Implant, Department of Orthopaedics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Ning Zhang
- The Key Laboratory of Stem Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
| | - Jiake Xu
- School of Pathology and Laboratory Medicine, University of Western Australia, Perth, Western Australia 6009, Australia
| | - Chuandong Wang
- Department of Orthopedic Surgery, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China
| | - Guoli Hu
- Department of Orthopedic Surgery, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China
| | - Xiaoling Zhang
- Department of Orthopedic Surgery, Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200092, China.,The Key Laboratory of Stem Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200025, China
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20
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Fibrin-Enhanced Canonical Wnt Signaling Directs Plasminogen Expression in Cementoblasts. Int J Mol Sci 2017; 18:ijms18112380. [PMID: 29120400 PMCID: PMC5713349 DOI: 10.3390/ijms18112380] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 11/06/2017] [Accepted: 11/07/2017] [Indexed: 11/17/2022] Open
Abstract
Cementum is a mineralized layer on the tooth's root surface and facilitates the biomechanical anchoring of fibrous connective tissues as a part of tooth-supportive complexes. Previously, we observed that OCCM30 cementoblasts cultured on fibrin matrices underwent apoptosis due to fibrin degradation through the expression of proteases. Here, we demonstrated that OCCM30 on fibrin matrices (OCCM30-fibrin) enhanced canonical Wnt signaling, which directed to plasminogen expression. The OCCM30-fibrin showed higher levels of Wnt3a expression, nuclear translocation of β-catenin, and T-cell factor (TCF) optimal motif (TOP) reporter activity than the cells on tissue culture dishes (OCCM30-TCD), indicating that the OCCM30-fibrin enhanced canonical Wnt/β-catenin signaling. Also, OCCM30-fibrin expressed biomineralization-associated markers at higher levels than OCCM30-TCD, of which levels were further increased with LiCl, a Wnt signaling activator. The OCCM30 cementoblasts simultaneously showed that high levels of plasminogen, a critical component of fibrinolysis, were expressed in the OCCM30-fibrin. Activation of canonical Wnt signaling with LiCl treatment or with forced lymphoid enhancer factor 1 (LEF1)-expression increased the expression of plasminogen. On the contrary, the inhibition of canonical Wnt signaling with siRNAs against Wnt3a or β-catenin abrogated fibrin-enhanced plasminogen expression. Furthermore, there are three conserved putative response elements for the LEF1/β-catenin complex in the plasminogen proximal promoter regions (-900 to +54). Site-directed mutations and chromatin immunoprecipitation indicated that canonical Wnt signaling directed plasminogen expression. Taken together, this study suggests that fibrin-based materials can modulate functional periodontal formations in controlling cementoblast differentiation and fibrin degradation.
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21
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PTH[1-34] improves the effects of core decompression in early-stage steroid-associated osteonecrosis model by enhancing bone repair and revascularization. PLoS One 2017; 12:e0178781. [PMID: 28562696 PMCID: PMC5451136 DOI: 10.1371/journal.pone.0178781] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 05/18/2017] [Indexed: 12/31/2022] Open
Abstract
Steroid-associated osteonecrosis (SAON) might induce bone collapse and subsequently lead to joint arthroplasty. Core decompression (CD) is regarded as an effective therapy for early-stage SAON, but the prognosis is unsatisfactory due to incomplete bone repair. Parathyroid hormone[1–34] (PTH[1–34]) has demonstrated positive efficacy in promoting bone formation. We therefore evaluated the effects of PTH on improving the effects of CD in Early-Stage SAON. Distal femoral CD was performed two weeks after osteonecrosis induction or vehicle injection, with ten of the ON-induced rabbits being subjected to six-week PTH[1–34] treatment and the others, including ON-induced and non-induced rabbits, being treated with vehicle. MRI confirmed that intermittent PTH administration improved SAON after CD therapy. Micro-CT showed increased bone formation within the tunnel. Bone repair was enhanced with decreased empty osteocyte lacunae and necrosis foci area, resulting in enhanced peak load and stiffness of the tunnel. Additionally, PTH enlarged the mean diameter of vessels in the marrow and increased the number of vessels within the tunnels, as well as elevated the expression of BMP-2, RUNX2, IGF-1, bFGF and VEGF, together with serum OCN and VEGF levels. Therefore, PTH[1–34] enhances the efficacy of CD on osteogenesis and neovascularization, thus promoting bone and blood vessels repair in the SAON model.
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22
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Zhang X, Du Y, Ling J, Li W, Liao Y, Wei X. Dickkopf-related protein 3 negatively regulates the osteogenic differentiation of rat dental follicle cells. Mol Med Rep 2017; 15:1673-1681. [PMID: 28259940 PMCID: PMC5364975 DOI: 10.3892/mmr.2017.6165] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 12/15/2016] [Indexed: 01/05/2023] Open
Abstract
The present study aimed to investigate the effect of Dickkopf-related protein 3 (DKK3) on osteogenic differentiation of rat dental follicle cells (DFCs). A PCR array analysis of Wnt pathway activation in DFCs identified genes dysregulated by mineral induction. Among them, DKK3expression levels were decreased, and further experiments were conducted to investigate its role in DFC osteogenesis. By comparing DFCs grown in normal growth and mineral-induction media for 4 weeks, the present study confirmed that DKK3 was a potential target gene of osteogenesis through reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blotting (WB). A short hairpin RNA (shRNA) was introduced into DFCs using a lentiviral vector to inhibit DKK3 expression. An alkaline phosphatase (ALP) activity assay and Alizarin Red staining were performed to observe the DKK3-shRNA DFCs. In addition, the osteogenic differentiation of DKK3-shRNA DFCs was analyzed by RT-qPCR and WB. In vivo, DKK3-shRNA DFCs seeded on hydroxyapatite/β-tricalcium phosphate (HA/TCP) scaffolds were transplanted into the subcutaneous tissue of mice with severe combined immunodeficiency, followed by hematoxylin-eosin and Masson staining. The results confirmed that DKK3 expression was downregulated during mineral induction in rat DFCs. Lentivirus-mediated expression of DKK3 shRNA in DFCs promoted calcified-nodule formation, ALP activity and the expression of β-catenin, runt-related transcription factor 2 and osteocalcin, compared with control cells. In vivo, the implanted section presented the majority of newly formed osteoid matrices and collagen, with limited space between the HA/TCP scaffolds and matrices. In conclusion, DKK3 expression negatively regulates the osteogenic differentiation of DFCs and, conversely, downregulation of DKK3 may enhance DFC osteogenesis.
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Affiliation(s)
- Xinchun Zhang
- Department of Prosthodontics, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat‑sen University, Guangzhou, Guangdong 510055, P.R. China
| | - Yu Du
- Department of Operative Dentistry and Endodontics, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat‑sen University, Guangzhou, Guangdong 510055, P.R. China
| | - Junqi Ling
- Department of Operative Dentistry and Endodontics, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat‑sen University, Guangzhou, Guangdong 510055, P.R. China
| | - Weiqiang Li
- Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Yan Liao
- Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Xi Wei
- Department of Operative Dentistry and Endodontics, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat‑sen University, Guangzhou, Guangdong 510055, P.R. China
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23
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Wang L, Hu H, Cheng Y, Chen J, Bao C, Zou S, Wu G. Screening the Expression Changes in MicroRNAs and Their Target Genes in Mature Cementoblasts Stimulated with Cyclic Tensile Stress. Int J Mol Sci 2016; 17:ijms17122024. [PMID: 27941605 PMCID: PMC5187824 DOI: 10.3390/ijms17122024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 11/22/2016] [Accepted: 11/24/2016] [Indexed: 02/05/2023] Open
Abstract
Cementum is a thin layer of cementoblast-produced mineralized tissue covering the root surfaces of teeth. Mechanical forces, which are produced during masticatory activity, play a paramount role in stimulating cementoblastogenesis, which thereby facilitates the maintenance, remodeling and integrity of cementum. However, hitherto, the extent to which a post-transcriptional modulation mechanism is involved in this process has rarely been reported. In this study, a mature murine cementoblast cell line OCCM-30 cells (immortalized osteocalcin positive cementoblasts) was cultured and subjected to cyclic tensile stress (0.5 Hz, 2000 µstrain). We showed that the cyclic tensile stress could not only rearrange the cell alignment, but also influence the proliferation in an S-shaped manner. Furthermore, cyclic tensile stress could significantly promote cementoblastogenesis-related genes, proteins and mineralized nodules. From the miRNA array analyses, we found that 60 and 103 miRNAs were significantly altered 6 and 18 h after the stimulation using cyclic tensile stress, respectively. Based on a literature review and bioinformatics analyses, we found that miR-146b-5p and its target gene Smad4 play an important role in this procedure. The upregulation of miR-146b-5p and downregulation of Smad4 induced by the tensile stress were further confirmed by qRT-PCR. The direct binding of miR-146b-5p to the three prime untranslated region (3' UTR) of Smad4 was established using a dual-luciferase reporter assay. Taken together, these results suggest an important involvement of miR-146b-5p and its target gene Smad4 in the cementoblastogenesis of mature cementoblasts.
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Affiliation(s)
- Liao Wang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu 610041, China.
| | - Haikun Hu
- China Dental Implantology Center, West China Dental Implantology Hospital, Sichuan University, No. 75 Xiaotianzhu Street, Chengdu 610041, China.
| | - Ye Cheng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu 610041, China.
| | - Jianwei Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu 610041, China.
| | - Chongyun Bao
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu 610041, China.
| | - Shujuan Zou
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3rd Section, South Renmin Road, Chengdu 610041, China.
| | - Gang Wu
- Department of Oral Implantology and Prosthetic Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), VU University Amsterdam and University of Amsterdam, MOVE Research Institute, Gustav Mahlerlaan 3004, 1081LA Amsterdam, The Netherlands.
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24
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Yamada S, Ozawa Y, Tomoeda M, Matoba R, Matsubara K, Murakami S. Regulation of PLAP-1 Expression in Periodontal Ligament Cells. J Dent Res 2016; 85:447-51. [PMID: 16632759 DOI: 10.1177/154405910608500510] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Periodontal-ligament-associated protein-1 ( PLAP-1) is preferentially expressed in the periodontal ligament (PDL) and encodes a novel small leucine-rich repeat proteoglycan protein. PLAP-1 expression was induced during the course of cytodifferentiation of PDL cells into mineralized-tissue-forming cells in vitro, suggesting the possible involvement of PLAP-1 in the mineralization process of PDL cells. In this study, we hypothesized that PLAP-1 expression is regulated by mineralization-related cytokines in PDL cells. PLAP-1 expression was clearly down-regulated when the cytodifferentiation of PDL cells was reversibly inhibited by fibroblast growth factor-2 (FGF-2). In contrast, bone morphogenetic protein-2 (BMP-2) enhanced PLAP-1 expression. Up-regulation of PLAP-1 expression by BMP-2 was confirmed at the protein level when PDL cells were immunostained with anti-PLAP-1 polyclonal antibody. These results revealed the cytokine-mediated regulatory mechanisms of PLAP-1 expression and suggested that PLAP-1 expression may be associated with the process of cytodifferentiation of PDL cells.
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Affiliation(s)
- S Yamada
- Department of Periodontology, Osaka University Graduate School of Dentistry, Suita, Japan
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25
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Nociti FH, Foster BL, Barros SP, Darveau RP, Somerman MJ. Cementoblast Gene Expression is Regulated by Porphyromonas gingivalis Lipopolysaccharide Partially via Toll-like Receptor-4/MD-2. J Dent Res 2016; 83:602-7. [PMID: 15271967 DOI: 10.1177/154405910408300804] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Lipopolysaccharides are potent inflammatory mediators considered to contribute to destruction of periodontal tissues. Here, we hypothesized that Porphyromonas gingivalis lipopolysaccharide (P-LPS) treatment would regulate gene expression in murine cementoblasts through Toll-like receptor 4. Real-time (RT)-PCR and Northern blot analysis indicated that P-LPS decreased expression of transcripts for osteocalcin (OCN) and receptor activator of nuclear factor κB ligand (RANKL). In contrast, a dose-dependent up-regulation in mRNA levels for osteopontin (OPN) and osteoprotegerin (OPG) was observed. Similarly, ELISA demonstrated decreased RANKL and increased OPG levels. A monoclonal antibody specific for mouse TLR-4/MD-2 partially neutralized the P-LPS effect on cementoblasts. These results indicate that exposure of cementoblasts to P-LPS can alter cell function by regulating markers of osteoclastic activity ( e.g., RANKL/OPG), thereby potentially affecting the inflammation-associated resorption of mineralized tissues.
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MESH Headings
- Animals
- Antigens, Ly/drug effects
- Antigens, Ly/genetics
- Antigens, Ly/metabolism
- Blotting, Northern
- Carrier Proteins/genetics
- Carrier Proteins/metabolism
- Cells, Cultured
- Dental Cementum/cytology
- Dental Cementum/drug effects
- Dental Cementum/metabolism
- Dose-Response Relationship, Drug
- Gene Expression Regulation/drug effects
- Glycoproteins/genetics
- Glycoproteins/metabolism
- Lipopolysaccharide Receptors/drug effects
- Lipopolysaccharide Receptors/genetics
- Lipopolysaccharide Receptors/metabolism
- Lipopolysaccharides/pharmacology
- Lymphocyte Antigen 96
- Membrane Glycoproteins/drug effects
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/metabolism
- Mice
- Mice, Transgenic
- NF-kappa B/metabolism
- Osteocalcin/genetics
- Osteocalcin/metabolism
- Osteoclasts/drug effects
- Osteoclasts/metabolism
- Osteopontin
- Osteoprotegerin
- Porphyromonas gingivalis
- RANK Ligand
- RNA, Messenger/analysis
- Receptor Activator of Nuclear Factor-kappa B
- Receptors, Cell Surface/drug effects
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Receptors, Cytoplasmic and Nuclear/genetics
- Receptors, Cytoplasmic and Nuclear/metabolism
- Receptors, Tumor Necrosis Factor
- Reverse Transcriptase Polymerase Chain Reaction
- Sialoglycoproteins/genetics
- Sialoglycoproteins/metabolism
- Toll-Like Receptor 4
- Toll-Like Receptors
- Up-Regulation/drug effects
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Affiliation(s)
- F H Nociti
- Department of Prosthodontics/Periodontics, Division of Periodontics, School of Dentistry at Piracicaba, University of Campinas, Brazil
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26
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Sakisaka Y, Kanaya S, Nakamura T, Tamura M, Shimauchi H, Nemoto E. p38 MAP kinase is required for Wnt3a-mediated osterix expression independently of Wnt-LRP5/6-GSK3β signaling axis in dental follicle cells. Biochem Biophys Res Commun 2016; 478:527-32. [PMID: 27450807 DOI: 10.1016/j.bbrc.2016.07.076] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 07/18/2016] [Indexed: 11/24/2022]
Abstract
Wnt3a is a secreted glycoprotein that activates the glycogen synthase kinase-3β (GSK3β)/β-catenin signaling pathway through low-density-lipoprotein receptor-related protein (LRP)5/6 co-receptors. Wnt3a has been implicated in periodontal development and homeostasis, as well as in cementum formation. Recently, we have reported that Wnt3a increases alkaline phosphatase expression through the induction of osterix (Osx) expression in dental follicle cells, a precursor of cementoblasts. However, the molecular mechanism by which Wnt3a induces Osx expression is still unknown. In this study, we show that Wnt3a-induced Osx expression was inhibited in the presence of p38 mitogen-activated protein kinase (MAPK) inhibitors (SB203580 and SB202190) at gene and protein levels, as assessed by real-time PCR and immunocytohistochemistry, respectively. Pretreatment of cells with Dickkopf-1, a potent canonical Wnt antagonist binding to LRP5/6 co-receptors, did not influence Wnt3a-mediated p38 MAPK phosphorylation, suggesting that Wnt3a activates p38 MAPK through LRP5/6-independent signaling. On the other hand, pretreatment with p38 MAPK inhibitors had no effects on the phosphorylated status of GSK3β and β-catenin as well as β-catenin nuclear translocation, but inhibited Wnt3a-mediated β-catenin transcriptional activity. These findings suggest that p38 MAPK modulates canonical Wnt signaling at the β-catenin transcriptional level without any crosstalk with the Wnt3a-mediated LRP5/6-GSK3β signaling axis and subsequent β-catenin nuclear translocation. These findings expand our knowledge of the mechanisms controlling periodontal development and regeneration.
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Affiliation(s)
- Yukihiko Sakisaka
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Sousuke Kanaya
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan; Liason Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Takashi Nakamura
- Department of Dental Pharmacology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Masato Tamura
- Department of Biochemistry and Molecular Biology, Hokkaido University Graduate School of Dentistry, Sapporo 060-8586, Japan
| | - Hidetoshi Shimauchi
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Eiji Nemoto
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan.
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27
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Wang W, Dang M, Zhang Z, Hu J, Eyster TW, Ni L, Ma PX. Dentin regeneration by stem cells of apical papilla on injectable nanofibrous microspheres and stimulated by controlled BMP-2 release. Acta Biomater 2016; 36:63-72. [PMID: 26971664 DOI: 10.1016/j.actbio.2016.03.015] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/25/2016] [Accepted: 03/08/2016] [Indexed: 12/16/2022]
Abstract
UNLABELLED The aim of this study was to investigate the effects of PLLA nanofibrous microspheres (NF-MS) as a cell delivery carrier in combination with controlled release of BMP-2 from PLGA microspheres on the induction of odontogenic differentiation of human stem cells of apical papilla (SCAP). Injectable NF-MS, which mimic the physical architecture of collagen fibers on the nano scale, were fabricated by combining thermally-induced phase separation techniques with an emulsification process. SCAP cultured in a monolayer or cultured on NF-MS in spinner flasks were treated with 100ng/ml BMP-2 in vitro. Odontogenic differentiation was characterized by measuring alkaline phosphatase activity, odontogenic gene expression levels, calcium content, and dentin sialophosphoprotein accumulation. The results demonstrated that BMP-2 enhanced human SCAP odontogenic differentiation both in monolayer culture and on 3D NF-MS in spinner flask culture in vitro. We also developed and tested a system combining NF-MS with controlled BMP-2 release for dentin regeneration in vivo. The results indicate that controlled release of BMP-2 promoted more mineralization and osteodentin formation compared to a BSA-releasing control in a dose-dependent and time-dependent manner. In summary, the NF-MS combined with controlled release of BMP-2 provides an excellent microenvironment for SCAP to regenerate dentin tissue. STATEMENT OF SIGNIFICANCE Tooth lesion and loss affect masticatory efficiency, speaking function, facial aesthetics and even psychological health. Current treatments depend on "inert" restorative materials, which do not have the healing capacity and may lead to the failure of the restorations over a long term. The aim of this study was to develop an injectable biomaterial and desired growth factor delivery system to support stem cells for mineralized dental tissue regeneration. The study showed that novel injectable and biodegradable nanofibrous microspheres and controlled release of BMP-2 synergistically induce the odontogenic differentiation of human stem cells from the apical papilla and mineralized tissue regeneration, demonstrating the potential of living dental tissue repair.
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28
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Apical External Root Resorption and Repair in Orthodontic Tooth Movement: Biological Events. BIOMED RESEARCH INTERNATIONAL 2016; 2016:4864195. [PMID: 27119080 PMCID: PMC4828521 DOI: 10.1155/2016/4864195] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/08/2016] [Indexed: 12/20/2022]
Abstract
Some degree of external root resorption is a frequent, unpredictable, and unavoidable consequence of orthodontic tooth movement mediated by odontoclasts/cementoclasts originating from circulating precursor cells in the periodontal ligament. Its pathogenesis involves mechanical forces initiating complex interactions between signalling pathways activated by various biological agents. Resorption of cementum is regulated by mechanisms similar to those controlling osteoclastogenesis and bone resorption. Following root resorption there is repair by cellular cementum, but factors mediating the transition from resorption to repair are not clear. In this paper we review some of the biological events associated with orthodontically induced external root resorption.
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29
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Sagomonyants K, Kalajzic I, Maye P, Mina M. Enhanced Dentinogenesis of Pulp Progenitors by Early Exposure to FGF2. J Dent Res 2015; 94:1582-90. [PMID: 26276371 DOI: 10.1177/0022034515599768] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Members of the fibroblast growth factor (FGF) family play essential and important roles in primary and reparative dentinogenesis. Although there appears to be a general agreement on the effects of FGF signaling on the proliferation of pulp cells, there are conflicting results regarding its effects on odontoblast differentiation. We recently examined the effects of continuous exposure of dental pulp cells to FGF2 and showed that the effects of FGF2 on differentiation of progenitor cells into odontoblasts were stage specific and dependent on the stage of cell maturity. The purpose of this study was to gain further insight into cellular and molecular mechanisms regulating the stimulatory effects of FGF2 on odontoblast differentiation. To do so, we examined the effects of early and limited exposure of pulp cells from a series of green fluorescent protein (GFP) reporter transgenic mice that display stage-specific activation of transgenes during odontoblast differentiation to FGF2. Our results showed that early and limited exposure of pulp cells to FGF2 did not have significant effects on the extent of mineralization but induced significant increases in the expression of Dmp1 and Dspp and the number of DMP1-GFP(+) and DSPP-Cerulean(+) odontoblasts. Our results also showed that the stimulatory effects of FGF2 on odontoblast differentiation were mediated through FGFR/MEK/Erk1/2 signaling, increases in Bmp2, and activation of the BMP/BMPR signaling pathway. These observations show that early and limited exposure of pulp cells to FGF2 alone promotes odontoblast differentiation and provides critical insight for applications of FGF2 in dentin regeneration.
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Affiliation(s)
- K Sagomonyants
- Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - I Kalajzic
- Department of Reconstructive Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - P Maye
- Department of Reconstructive Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
| | - M Mina
- Department of Craniofacial Sciences, School of Dental Medicine, University of Connecticut Health Center, Farmington, CT, USA
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30
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Sakisaka Y, Tsuchiya M, Nakamura T, Tamura M, Shimauchi H, Nemoto E. Wnt5a attenuates Wnt3a-induced alkaline phosphatase expression in dental follicle cells. Exp Cell Res 2015; 336:85-93. [DOI: 10.1016/j.yexcr.2015.06.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 06/09/2015] [Accepted: 06/18/2015] [Indexed: 10/23/2022]
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31
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Li S, Zhang H, Li S, Yang Y, Huo B, Zhang D. Connexin 43 and ERK regulate tension-induced signal transduction in human periodontal ligament fibroblasts. J Orthop Res 2015; 33:1008-14. [PMID: 25731708 DOI: 10.1002/jor.22830] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 01/15/2015] [Indexed: 02/04/2023]
Abstract
Periodontal ligament (PDL) fibroblasts play an important role in preserving periodontal homeostasis and transmitting mechanical signals to alveolar bone. Connexin 43 (Cx43), a gap junction protein, is essential for bone homeostasis and regulates bone remodeling. However, the function of Cx43 in human PDL fibroblast-regulated bone remodeling has not yet been elucidated. In this study, human PDL fibroblasts were exposed to cyclic mechanical tension with a maximum 5% elongation for different durations. We then examined the expression of signaling molecules related to osteogenesis and osteoclastogenesis at both the mRNA and protein levels as well as the activity of extracellular signal-regulated kinase (ERK) in human PDL fibroblasts after loading. We found that mechanical tension increased Cx43, which further upregulated osteogenic (e.g., RUNX2, Osterix, and OPG) and down-regulated osteoclastogenic (e.g., RANKL) signaling molecules. Suppressing Cx43 gene (Gja1) by siRNA inhibited the increase in osteogenesis-related molecules but enhanced RANKL expression. Similar to Cx43, activated ERK1/2 was also enhanced by mechanical tension and suppressed by Cx43 siRNA. Inhibition of ERK1/2 signaling using PD98059 reduced the tension-regulated increase in osteogenesis-related molecules but enhanced that of osteoclastogenesis-related ones. These findings suggest that cyclic tension may involve into the osteogenic or osteoclastogenetic differentiation potential of human PDL fibroblasts via the Cx43-ERK1/2 signaling pathway.
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Affiliation(s)
- Shengnan Li
- Department of Stomatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100730, P.R., China
| | - Huajing Zhang
- Department of Stomatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100730, P.R., China
| | - Shuna Li
- Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, P.R., China
| | - Yanqi Yang
- Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China
| | - Bo Huo
- Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, P.R., China
| | - Ding Zhang
- Department of Stomatology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, 100730, P.R., China
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32
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Nemoto E, Sakisaka Y, Tsuchiya M, Tamura M, Nakamura T, Kanaya S, Shimonishi M, Shimauchi H. Wnt3a signaling induces murine dental follicle cells to differentiate into cementoblastic/osteoblastic cells via an osterix-dependent pathway. J Periodontal Res 2015; 51:164-74. [PMID: 26095156 DOI: 10.1111/jre.12294] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Dental follicle cells, putative progenitor cells for cementoblasts, osteoblasts and periodontal ligament cells, interplay with Hertwig's epithelial root sheath (HERS) cells during tooth root formation, in which HERS is considered to have an inductive role in initiating cementogenesis by epithelial-mesenchymal interaction. However, the specific mechanisms controlling the cementoblast/osteoblast differentiation of dental follicle cells are not fully understood. Canonical Wnt signaling has been implicated in increased bone formation by controlling mesenchymal stem cell or osteoblastic cell functions. This study examined the possible expression of canonical Wnt ligand in HERS and the role of Wnt signaling during the cementoblast/osteoblast differentiation of dental follicle cells. MATERIAL AND METHODS The expression of Wnt3a, a representative canonical Wnt ligand, in HERS was assessed by immunohistochemistry. The differentiation and function of immortalized murine dental follicle cells were evaluated by measuring alkaline phosphatase (ALP, Alpl) activity and osteogenic gene expression. RESULTS We identified the expression of Wnt3a in HERS during mouse tooth root development by immunohistochemistry as well as in cultured human epithelial rest cells of Malassez by real-time polymerase chain reaction, while no expression of Wnt3a was detected in cultured dental mesenchymal cells. Exposure of immortalized murine dental follicle cells to Wnt3a-induced ALP activity as well as expression of the Alpl gene. Pretreatment of cells with Dickkopf-1, a potent canonical Wnt antagonist, markedly attenuated the effect of Wnt3a on ALP expression. Furthermore, Wnt3a induced transcriptional activity of runt-related transcription factor 2 (Runx2) and expression of osterix at gene and/or protein levels. Treatment with osterix-small interfering RNA significantly inhibited Wnt3a-induced ALP expression at gene and protein levels. CONCLUSION These findings suggest that HERS has a potential role in stimulating cementoblast/osteoblast differentiation of dental follicle cells via the Wnt/β-catenin signaling pathway.
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Affiliation(s)
- E Nemoto
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Y Sakisaka
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - M Tsuchiya
- Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Tohoku Fukushi University, Sendai, Japan
| | - M Tamura
- Department of Biochemistry and Molecular Biology, Hokkaido University Graduate School of Dentistry, Sapporo, Japan
| | - T Nakamura
- Department of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - S Kanaya
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - M Shimonishi
- Department of Comprehensive Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - H Shimauchi
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, Japan
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33
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Abstract
Alveolar bone remodeling is a continuous process that takes place during development and in response to various physiological and pathological stimuli. However, detailed knowledge regarding the underlying mechanisms involved in alveolar bone development is still lacking. This study aims at improving our understanding of alveolar bone formation and the role of bone morphogenetic proteins (Bmps) in this process. Mice at embryonic (E) day 13.5 to postnatal (PN) day 15.5 were selected to observe the process of alveolar bone development. Alveolar bone development was found to be morphologically observable at E14.5. Molar teeth isolated from mice at PN7.5 were pretreated with Bmp2, Bmp4, Noggin, or BSA, and grafted subcutaneously into mice. The subcutaneously implanted tooth germs formed alveolar bone indicating the role of the dental follicle in alveolar bone development. Alveolar bone formation was increased after pretreatment with Bmp2 and Bmp4, but not with Noggin. Gene expression levels in dental follicle cells from murine molars were also determined by real-time RT-PCR. The expression levels of Runx2, Bsp, and Ocn were significantly higher in dental follicle cells cultured with Bmp2 or Bmp4, and significantly lower in those cultured with Noggin when compared with that of the BSA controls. Our results suggest that the dental follicle participates in alveolar bone formation and Bmp2/4 appears to accelerate alveolar bone development.
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Affiliation(s)
- Mingming Ou
- Department of Stomatology, Beijing Friendship Hospital, Capital Medical University , Beijing , China
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34
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Peng Z, Liu L, Wei X, Ling J. Expression of Oct-4, SOX-2, and MYC in dental papilla cells and dental follicle cells during in-vivo tooth development and in-vitro co-culture. Eur J Oral Sci 2015; 122:251-8. [PMID: 25039286 DOI: 10.1111/eos.12141] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/10/2014] [Indexed: 01/06/2023]
Abstract
During tooth development, the special structure of dental follicle and dental papilla enables dental papilla cells (DPCs) and dental follicle cells (DFCs) to make contact with each other. Octamer-binding transcription factor 4 (Oct-4), sex determining region Y box-2 (SOX-2), and cellular homologue of avian myelocytomatosis virus oncogene (MYC) (OSM) are associated with reprogramming and pluripotency. However, whether the expression of OSM could be activated through cell-cell communication is not known. In this study, the distribution of OSM in rat tooth germ was investigated by immunohistochemical staining. An in-vitro co-culture system of DPCs and DFCs was established. Cell proliferation, cell apoptosis, cell cycle stages, and expression of OSM were investigated by Cell Counting Kit 8 (CCK8) analysis, flow cytometry, real-time PCR, and immunohistochemical staining. We found that Oct-4 and SOX-2 were strongly expressed in tooth germ on days 7 and 9 after birth, whereas MYC was expressed only on day 9. Cell proliferation and apoptosis were inhibited, the cell cycle was arrested in the G0/G1 phase, and the propidium iodide (PI) value was downregulated. Expression of Oct-4 and SOX-2 was significantly elevated in both cell types after 3 d of co-culture, whereas expression of MYC was not significantly elevated until day 5. These results indicate that the optimized microenvironment with cell-cell communication enhanced the expression of reprogramming markers associated with reprogramming capacity in DPCs and DFCs, both in vivo and in vitro.
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Affiliation(s)
- Zhengjun Peng
- Operative Dentistry and Endodontics, Guanghua School of Stomatology, Affiliated Stomatological Hospital, Guangdong Province Key Laboratory of Stomatology Guangzhou, Sun Yat-Sen University, Guangdong, China
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35
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Zhu H, Cai X, Lin T, Shi Z, Yan S. Low-intensity pulsed ultrasound enhances bone repair in a rabbit model of steroid-associated osteonecrosis. Clin Orthop Relat Res 2015; 473:1830-9. [PMID: 25736917 PMCID: PMC4385349 DOI: 10.1007/s11999-015-4154-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 01/13/2015] [Indexed: 01/31/2023]
Abstract
BACKGROUND Steroids are a leading cause of femoral head osteonecrosis. Currently there are no medications available to prevent and/or treat steroid-associated osteonecrosis. Low-intensity pulsed ultrasound (LIPUS) was approved by the FDA for treating delayed union of bone fractures. Some studies have reported that LIPUS can enhance bone formation and local blood flow in an animal model of fracture healing. However, whether the effect of osteogenesis and neovascularization by LIPUS can enhance the repair progress in steroid-associated osteonecrosis is unknown. QUESTIONS/PURPOSES We hypothesized that LIPUS may facilitate osteogenesis and neovascularization in the reparative processes of steroid-associated osteonecrosis. Using a rabbit animal model, we asked whether LIPUS affects (1) bone strength and trabecular architecture; (2) blood vessel number and diameter; and (3) BMP-2 and VEGF expression. METHODS Bilateral femoral head necrosis was induced by lipopolysaccharide and methylprednisolone in 24 rabbits. The left femoral heads of rabbits received LIPUS therapy (200 mW/cm(2)) for 20 minutes daily and were classified as the LIPUS group. The right femoral heads of the same rabbits did not receive therapy and were classified as the control group. All rabbits were euthanized 12 weeks after LIPUS therapy. Micro-CT, biomechanical testing, histologic evaluation, immunohistochemistry, quantitative real-time PCR, and Western blot were used for examination of the effects of LIPUS. RESULTS Twelve weeks after LIPUS treatment, the loading strength in the control group was 355 ± 38 N (95% CI, 315-394 N), which was lower (p = 0.028) than that in the LIPUS group (441 ± 78 N; 95% CI, 359-524 N). The bone tissue volume density (bone volume/total volume) in the LIPUS group (49.29% ± 12.37%; 95 % CI, 36.31%-62.27%) was higher (p = 0.022) than that in the control group (37.93% ± 8.37%; 95 % CI, 29.15%-46.72%). The percentage of empty osteocyte lacunae in the LIPUS group (17% ± 4%; 95% CI, 15%-20%) was lower (p = 0.002) than that in the control group (26% ± 9%; 95% CI, 21%-32%). The mineral apposition rate (μm/day) in the LIPUS group (2.3 ± 0.8 μm/day; 95% CI, 1.8 2.8 μm/day) was higher (p = 0.001) than that in the control group (1.6 ± 0.3 μm/day; 95% CL, 1.4-1.8 μm/day). The number of blood vessels in the LIPUS group (7.8 ± 3.6/mm(2); 95% CI, 5.5-10.1 mm(2)) was greater (p = 0.025) than the number in the control group (5.7 ± 2.6/mm(2); 95% CI, 4.0-7.3 mm(2)). Messenger RNA (mRNA) and protein expression of BMP-2 in the LIPUS group (75 ± 7, 95% CI, 70-79; and 30 ± 3, 95% CI, 28-31) were higher (both p < 0.001) than those in the control groups (46 ± 5, 95% CI, 43-49; and 15 ± 2, 95% CI, 14-16). However, there were no differences (p = 0.114 and 0.124) in mRNA and protein expression of vascular endothelial growth factor between the control (26 ± 3, 95% CI, 24-28; and 22 ± 6, 95% CI, 18-26) and LIPUS groups (28 ± 2, 95% CI, 26-29; and 23 ± 6, 95% CI, 19-27). CONCLUSIONS The results of this study indicate that LIPUS promotes osteogenesis and neovascularization, thus promoting bone repair in this steroid-associated osteonecrosis model. CLINICAL RELEVANCE LIPUS may be a promising modality for the treatment of early-stage steroid-associated osteonecrosis. Further research, including clinical trials to determine whether LIPUS has a therapeutic effect on patients with early-onset steroid-associated osteonecrosis may be warranted.
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Affiliation(s)
- Hanxiao Zhu
- Department of Orthopaedic Surgery, Second Affiliated Hospital’s Campus in Binjiang District, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009 People’s Republic of China
| | - Xunzi Cai
- Department of Orthopaedic Surgery, Second Affiliated Hospital’s Campus in Binjiang District, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009 People’s Republic of China
| | - Tiao Lin
- Department of Orthopaedic Surgery, Second Affiliated Hospital’s Campus in Binjiang District, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009 People’s Republic of China
| | - Zhongli Shi
- Department of Orthopaedic Surgery, Second Affiliated Hospital’s Campus in Binjiang District, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009 People’s Republic of China
| | - Shigui Yan
- Department of Orthopaedic Surgery, Second Affiliated Hospital’s Campus in Binjiang District, School of Medicine, Zhejiang University, No. 88 Jiefang Road, Hangzhou, 310009 People’s Republic of China
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36
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Açil Y, Yang F, Gulses A, Ayna M, Wiltfang J, Gierloff M. Isolation, characterization and investigation of differentiation potential of human periodontal ligament cells and dental follicle progenitor cells and their response to BMP-7 in vitro. Odontology 2015; 104:123-35. [PMID: 25757659 DOI: 10.1007/s10266-015-0198-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 01/18/2015] [Indexed: 12/18/2022]
Abstract
The aim of this study was to assess the factors, mechanisms and the differences between periodontal ligament (PDL) cells and denta l follicle (DF) progenitor cells towards the osteoblastic/cementoblastic differentiation and to investigate the effects of BMP-7 on developmental (DF) and mature tissue-derived (PDL) cells, respectively. Primary cell culture of PDL cells and DF progenitor cells was performed. Osteogenic differentiation was evaluated using von Kossa, Alizarin Red S and immuno-histo-chemistry staining of osteocalcin. Gene expression pattern was evaluated via real-time PCR. A series of CD surface marks were tested using flow cytometry and fluorescence-activated cell-sorting analysis was performed. Real-time RT-PCR demonstrated similar gene expression pattern of PDL cells and DF progenitor cells: the expression of OPN and OCN significantly was elevated when incubated with osteogenic components, Runx2 was unaffected, and Osteorix was hardly expressed whether in basic medium or induction medium. In addition, BMP-7 induced osteoblast/cementoblast differentiation of PDLSCs and DF progenitor cells in a dose- and time-dependent manner, as reflected by enhanced Runx2 and (OCN) mRNA transcript expression. BMP-7 triggers PDL cells and DF progenitor cells to differentiate towards an osteoblast/cementoblast phenotype.
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Affiliation(s)
- Yahya Açil
- Department of Oral and Maxillofacial Surgery, Christian Albrechts University, Kiel, Germany
| | - Fan Yang
- Affiliated Hospital of Stomatology, Medical College, Zhejiang University, Hangzhou, China
| | - Aydin Gulses
- Centre for Oral Health and Dental Management, Mevki Military Hospital, 06130, Diskapi Altindag, Ankara, Turkey.
| | | | - Jörg Wiltfang
- Department of Oral and Maxillofacial Surgery, Christian Albrechts University, Kiel, Germany
| | - Matthias Gierloff
- Department of Oral and Maxillofacial Surgery, Christian Albrechts University, Kiel, Germany
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37
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Pilipchuk SP, Plonka AB, Monje A, Taut AD, Lanis A, Kang B, Giannobile WV. Tissue engineering for bone regeneration and osseointegration in the oral cavity. Dent Mater 2015; 31:317-38. [PMID: 25701146 DOI: 10.1016/j.dental.2015.01.006] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Revised: 12/19/2014] [Accepted: 01/11/2015] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The focus of this review is to summarize recent advances on regenerative technologies (scaffolding matrices, cell/gene therapy and biologic drug delivery) to promote reconstruction of tooth and dental implant-associated bone defects. METHODS An overview of scaffolds developed for application in bone regeneration is presented with an emphasis on identifying the primary criteria required for optimized scaffold design for the purpose of regenerating physiologically functional osseous tissues. Growth factors and other biologics with clinical potential for osteogenesis are examined, with a comprehensive assessment of pre-clinical and clinical studies. Potential novel improvements to current matrix-based delivery platforms for increased control of growth factor spatiotemporal release kinetics are highlighting including recent advancements in stem cell and gene therapy. RESULTS An analysis of existing scaffold materials, their strategic design for tissue regeneration, and use of growth factors for improved bone formation in oral regenerative therapies results in the identification of current limitations and required improvements to continue moving the field of bone tissue engineering forward into the clinical arena. SIGNIFICANCE Development of optimized scaffolding matrices for the predictable regeneration of structurally and physiologically functional osseous tissues is still an elusive goal. The introduction of growth factor biologics and cells has the potential to improve the biomimetic properties and regenerative potential of scaffold-based delivery platforms for next-generation patient-specific treatments with greater clinical outcome predictability.
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Affiliation(s)
- Sophia P Pilipchuk
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, 1101 Beal Avenue, Ann Arbor, MI 48109, USA.
| | - Alexandra B Plonka
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA.
| | - Alberto Monje
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA.
| | - Andrei D Taut
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA.
| | - Alejandro Lanis
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA.
| | - Benjamin Kang
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA.
| | - William V Giannobile
- Department of Periodontics and Oral Medicine, School of Dentistry, University of Michigan, Ann Arbor, 1011 N. University Avenue, Ann Arbor, MI 48109, USA; Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, 1101 Beal Avenue, Ann Arbor, MI 48109, USA.
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Osteogenic differentiation and gene expression profile of human dental follicle cells induced by human dental pulp cells. J Mol Histol 2014; 46:93-106. [PMID: 25520056 DOI: 10.1007/s10735-014-9604-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 12/15/2014] [Indexed: 12/20/2022]
Abstract
Dental follicle cells (DFCs) differentiate into cementoblasts or osteoblasts under appropriate triggering. However, the mechanism(s) for osteogenic differentiation of DFCs are still unclear. The purpose of this study was to examine the effects of dental papilla-derived human dental pulp cells (hDPCs) on osteogenic differentiation of human DFCs (hDFCs) in vitro and in vivo and to compare gene expression in hDFCs in the presence or absence of hDPCs. To evaluate the osteogenic differentiation of hDFCs induced by hDPCs, hDFCs were cultured in osteogenic medium with or without hDPCs-conditioned medium (CM) in vitro and the cells transplanted into the subcutaneous tissue of immunodeficient mice in vivo. The hDPCs-CM enhanced alkaline phosphatase promoter activity of hDFCs in osteogenic culture. The expression of several osteoblast marker genes was increased in hDFCs treated with hDPCs-CM compared to hDFCs in normal medium. The hDFCs induced by hDPCs-CM also produced more calcified nodules than hDFCs in normal medium. In transplantation experiments, hDPCs-CM promoted the osteogenic induction and bone formation of hDFCs. Microarray analysis and quantitative real-time PCR showed that osteogenesis-related genes including WNT2, VCAN, OSR2, FOSB, and POSTN in hDFCs were significantly upregulated after induction by hDPCs-CM compared to hDFCs in normal medium. These findings indicate that hDPCs could increase the expression of osteogenic genes in hDFCs and stimulate their osteogenesis and could be a cellular resource for bone regeneration therapy when induced by hDPCs-derived factors.
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Xiang L, Chen M, He L, Cai B, Du Y, Zhang X, Zhou C, Wang C, Mao JJ, Ling J. Wnt5a regulates dental follicle stem/progenitor cells of the periodontium. Stem Cell Res Ther 2014; 5:135. [PMID: 25510849 PMCID: PMC4446079 DOI: 10.1186/scrt525] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 11/18/2014] [Indexed: 12/20/2022] Open
Abstract
Introduction Dental follicle gives rise to one or several tissues of the periodontium including the periodontal ligament, cementum and/or alveolar bone. Whether Wnt5a is expressed in the postnatal periodontium or regulates dental follicle stem/progenitor cells is unknown. Methods Dental follicle stem/progenitor cells were isolated from postnatal day 1 (p1) to p11 from rat mandibular first molars. Immunolocalization mapped Wnt5a expression in the alveolar bone, periodontal ligament, and the developing ameloblast and odontoblast layers. Mononucleated and adherent cells were isolated from p7 dental follicle. Wnt5a was overexpressed in dental follicle stem/progenitor cells to study their proliferation, osteogenic differentiation and migration behavior, with subpopulations of native dental follicle stem/progenitor cells as controls, using real-time PCR (Taqman), Lenti-viral transfection, Western blotting and immunofluorescence. Results Wnt5a was expressed consistently in p1 to p11 rat peridontium. Native, p7 dental follicle stem/progenitor cells had modest ability to mineralize in the tested 14 days. Even in chemically defined osteogenesis medium, dental follicle stem/progenitor cells only showed modest mineralization. Upon addition of 300 ng/mL Wnt5a protein in osteogenesis medium, dental follicle stem/progenitor cells displayed mineralization that was still unremarkable. Chemically induced or Wnt5a-induced mineralization of dental follicle cells only occurred sparsely. Combination of Wnt5a with 100 ng/mL BMP2 finally prompted dental follicle stem/progenitor cells to produce robust mineralization with elevated expression of Runx2, alkaline phosphatase, collagen 1α1 and osteocalcin. Thus, native dental follicle stem/progenitor cells or some of their fractions may be somewhat modest in mineralization. Strikingly, Wnt5a protein significantly augmented RANKL ligand, suggesting putative regulatory roles of dental follicle stem/progenitor cells for the monocyte/osteoclast lineage and potential involvement in alveolar bone remodeling and/or resorption. P-Jnk1/2 was activated in Wnt5a overexpressed dental follicle cells; conversely, exposure to SP600125, a c-Jun N-terminal kinase (JNK) inhibitor attenuated Runx2, collagen 1α1 and osteocalcin expression either in the presence or absence of Wnt5a. Wnt5a overexpression in dental follicle stem/progenitor cells significantly reduced their proliferation rates, but robustly augmented their migration capacity. Conclusions These findings provide a glimpse of Wnt5a’s putative roles in dental follicle stem/progenitor cells and the periodontium with implications in periodontal disease, tooth eruption, dental implant bone healing and orthodontic tooth movement.
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Bone morphogenetic protein 7 induces cementogenic differentiation of human periodontal ligament-derived mesenchymal stem cells. Odontology 2014; 104:1-9. [DOI: 10.1007/s10266-014-0182-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 10/16/2014] [Indexed: 10/24/2022]
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Oralová V, Chlastáková I, Radlanski RJ, Matalová E. Distribution of BMP6 in the alveolar bone during mouse mandibular molar eruption. Connect Tissue Res 2014; 55:357-66. [PMID: 25084210 DOI: 10.3109/03008207.2014.951441] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Eruption requires synchrony of the tooth with the surrounding tissues, particularly the bone. One important step during eruption is remodelling of the alveolar bone at the base of the tooth and along the roots. Expression of BMP6 was reported to be increased in the basal half of the dental follicle prior to eruption and inhibition of BMP6 affected bone formation at the base of the alveolar crypt. The aim of this study was to further investigate BMP6 protein in relation to tooth eruption and the corresponding bone remodelling using temporospatial correlations of BMP6 localization with morphogenetic events (proliferation, differentiation, apoptosis and bone apposition/resorption), other BMPs (BMP2 and BMP7) and three-dimensional images of tooth-bone development. BMP6 expression pattern was mapped in the mandibular molar teeth and related structures around eruption. Localization of BMP6 dominated in osteoblasts, in regions of bone formation within the alveolar crypt. These findings positively correlated with proliferation at the tooth base region, osteocalcin expression in the osteoblasts/osteocytes and BMP2 and BMP7 presence in the alveolar bone surrounding the tooth. Osteoclast activity and apoptotic elimination in the root region gradually decreased before eruption and totally ceased at eruption stages. Generally, BMP6 positively correlated with BMP2, BMP7 and osteocalcin-positive osteoblasts, and areas of bone remodelling. Moreover, BMP6 was found in the periodontium and cementoblasts. BMP6 expression in the alveolar bone accompanied tooth eruption. Notably, the expression pattern of BMP6 in the bone did not differ around individual molar teeth at the same stage of development. The expression of BMP6 in periodontal ligaments may contribute to interaction between the tooth and bone during the eruption and anchoring process.
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Affiliation(s)
- Veronika Oralová
- Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic , Brno , Czech Republic
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Yang Y, Ge Y, Chen G, Yan Z, Yu M, Feng L, Jiang Z, Guo W, Tian W. Hertwig's epithelial root sheath cells regulate osteogenic differentiation of dental follicle cells through the Wnt pathway. Bone 2014; 63:158-65. [PMID: 24657304 DOI: 10.1016/j.bone.2014.03.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 03/09/2014] [Accepted: 03/12/2014] [Indexed: 02/05/2023]
Abstract
The development of periodontal ligament-cementum complex (PLCC) originates from the interaction between epithelial cells of Hertwig's epithelial root sheath (HERS) and mesenchymal cells of the dental follicle. While previous studies have suggested that the Wnt pathway is involved in osteogenic differentiation of dental follicle cells (DFCs) during tooth root development, its involvement in the interaction between DFCs and HERS cells (HERSCs) in tooth root mineralization remains unclear. Here, we investigated the hypothesis that HERSCs control osteogenic differentiation of DFCs via the Wnt pathway. We found that during co-culture with HERSCs, DFCs exhibited a greater tendency to form mineralized nodules. Moreover, under these conditions, DFCs expressed high levels of cementoblast/osteoblast differentiation-related markers, such as bone sialoprotein (BSP) and osteocalcin (OCN), the periodontal ligament phenotype-related gene type I collagen (COL1), and β-catenin (CTNNB1), a core player in the canonical Wnt pathway. In contrast, expression in DFCs of alkaline phosphatase (ALP) was greatly decreased in the presence of HERSCs. Expression of CTNNB1 in DFCs was stimulated by Wnt3a, a representative canonical member of the Wnt family of ligands, but suppressed by Dickkopf1 (DKK1), a Wnt/CTNNB1 signaling inhibitor. Furthermore, in the presence of treated dentin matrix (TDM), differentiation of DFCs was enhanced by Wnt3a when they were in direct contact with HERSCs, but was curtailed by DKK1. Taken together, these results indicate that during tooth root formation, HERSCs induce osteogenic differentiation of DFCs in a process involving the Wnt pathway and the dentin matrix. Our study not only contributes to our understanding of tooth root development and diseases of tooth root mineralization, but also proffers a novel potential strategy for controlling mineralization during tooth root regeneration.
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Affiliation(s)
- Yaling Yang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Yaneng Ge
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Guoqing Chen
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Zhiling Yan
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Mei Yu
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Lian Feng
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Zongting Jiang
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Weihua Guo
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Pedodontics, West China School of Stomatology, Sichuan University, No. 14, 3rd Sec., Ren Min Nan Road, Chengdu, 610041 Sichuan Province, China.
| | - Weidong Tian
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China; National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China.
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Combined effects of dentin sialoprotein and bone morphogenetic protein-2 on differentiation in human cementoblasts. Cell Tissue Res 2014; 357:119-32. [DOI: 10.1007/s00441-014-1831-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Accepted: 01/30/2014] [Indexed: 10/25/2022]
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Yashiro Y, Nomura Y, Kanazashi M, Noda K, Hanada N, Nakamura Y. Function of chemokine (CXC motif) ligand 12 in periodontal ligament fibroblasts. PLoS One 2014; 9:e95676. [PMID: 24806431 PMCID: PMC4012992 DOI: 10.1371/journal.pone.0095676] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 03/30/2014] [Indexed: 01/09/2023] Open
Abstract
The periodontal ligament (PDL) is one of the connective tissues located between the tooth and bone. It is characterized by rapid turnover. Periodontal ligament fibroblasts (PDLFs) play major roles in the rapid turnover of the PDL. Microarray analysis of human PDLFs (HPDLFs) and human dermal fibroblasts (HDFs) demonstrated markedly high expression of chemokine (CXC motif) ligand 12 (CXCL12) in the HPDLFs. CXCL12 plays an important role in the migration of mesenchymal stem cells (MSCs). The function of CXCL12 in the periodontal ligament was investigated in HPDLFs. Expression of CXCL12 in HPDLFs and HDFs was examined by RT-PCR, qRT-PCR and ELISA. Chemotactic ability of CXCL12 was evaluated in both PDLFs and HDFs by migration assay of MSCs. CXCL12 was also immunohistochemically examined in the PDL in vivo. Expression of CXCL12 in the HPDLFs was much higher than that in HDFs in vitro. Migration assay demonstrated that the number of migrated MSCs by HPDLFs was significantly higher than that by HDFs. In addition, the migrated MSCs also expressed CXCL12 and several genes that are familiar to fibroblasts. CXCL12 was immunohistochemically localized in the fibroblasts in the PDL of rat molars. The results suggest that PDLFs synthesize and secrete CXCL12 protein and that CXCL12 induces migration of MSCs in the PDL in order to maintain rapid turnover of the PDL.
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Affiliation(s)
- Yuichi Yashiro
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Yoshiaki Nomura
- Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Mikimoto Kanazashi
- Department of Periodontology, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Koji Noda
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Nobuhiro Hanada
- Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Yoshiki Nakamura
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
- * E-mail:
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Suzuki R, Nemoto E, Shimauchi H. Cyclic tensile force up-regulates BMP-2 expression through MAP kinase and COX-2/PGE2 signaling pathways in human periodontal ligament cells. Exp Cell Res 2014; 323:232-241. [PMID: 24561081 DOI: 10.1016/j.yexcr.2014.02.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/07/2014] [Accepted: 02/11/2014] [Indexed: 12/15/2022]
Abstract
Periodontal ligament cells play important roles in the homeostasis of periodontal tissue by mechanical stress derived from mastication, such as tension, compression, fluid shear, and hydrostatic force. In the present study, we showed that cyclic tensile force increased the gene expression level of bone morphogenetic protein (BMP)-2, a crucial regulator of mineralization, in human periodontal ligament cells using real-time PCR. Signaling inhibitors, PD98059/U0126 (extracellular signal-regulated kinase (ERK) inhibitors) and SB203580/SB202190 (p38 inhibitors), revealed that tensile force-mediated BMP-2 expression was dependent on activation of the ERK1/2 and p38 mitogen-activated protein (MAP) kinase pathways. Cyclic tensile force also induced cyclooxygenase-2 (COX-2) gene expression in a manner dependent on ERK1/2 and p38 MAP kinase pathways, and induced prostaglandin E2 (PGE2) biosynthesis. NS-398, a COX-2 inhibitor, significantly reduced tensile force-mediated BMP-2 expression, indicating that PGE2 synthesized by COX-2 may be involved in the BMP-2 induction. The inhibitory effect of NS-398 was completely restored by the addition of exogenous PGE2. However, stimulation with PGE2 alone in the absence of tensile force had no effect on the BMP-2 induction, indicating that some critical molecule(s) other than COX-2/PGE2 may be required for cyclic tensile force-mediated BMP-2 induction. Collectively, the results indicate that cyclic tensile force activates ERK1/2 and p38 MAP kinase signaling pathways, and induces COX-2 expression, which is responsible for the sequential PGE2 biosynthesis and release, and furthermore, mediates the increase in BMP-2 expression at the transcriptional level.
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Affiliation(s)
- Risako Suzuki
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
| | - Eiji Nemoto
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan.
| | - Hidetoshi Shimauchi
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
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Yeh Y, Yang Y, Yuan K. Importance of CD44 in the proliferation and mineralization of periodontal ligament cells. J Periodontal Res 2014; 49:827-35. [DOI: 10.1111/jre.12170] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2014] [Indexed: 12/23/2022]
Affiliation(s)
- Y. Yeh
- Institute of Oral Medicine; College of Medicine; National Cheng Kung University; Tainan Taiwan
| | - Y. Yang
- Institute of Oral Medicine; College of Medicine; National Cheng Kung University; Tainan Taiwan
| | - K. Yuan
- Institute of Oral Medicine; College of Medicine; National Cheng Kung University; Tainan Taiwan
- Department of Stomatology; National Cheng Kung University Hospital; Tainan Taiwan
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Song-Tao Q, Xiao-Rong Y, Jun P, Yong-Jian D, Jin L, Guang-Long H, Yun-Tao L, Jian R, Xiang-Zhao L, Jia-Ming X. Does the calcification of adamantinomatous craniopharyngioma resemble the calcium deposition of osteogenesis/odontogenesis? Histopathology 2014; 64:336-47. [PMID: 24387671 DOI: 10.1111/his.12071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 11/23/2012] [Indexed: 11/30/2022]
Abstract
AIMS Calcification in adamantinomatous craniopharyngioma (ACP) is troublesome for surgical intervention. The aim of this study was to examine the osteogenic proteins that play important roles in the calcium deposition of the odontogenic/osteogenic tissues in craniopharyngioma. METHODS AND RESULTS Craniopharyngiomas (n = 89) were investigated for the presence and expression pattern of the osteoinductive/odontoinductive factor bone morphogenetic protein-2 (Bmp2) and two osteoblastic differentiation makers, Runt-related transcription factor-2 (Runx2) and Osterix, using immunohistochemistry and Western blotting. Our results showed that Bmp2, Runx2 and Osterix levels increased in cases with high calcification and correlated positively with the degree of calcification in ACP, whereas they showed little or no expression in squamous papillary craniopharyngioma. In ACP, Bmp2 was expressed primarily in the stellate reticulum and whorl-like array cells; Runx2 and Osterix tended to be expressed in calcification-related epithelia, including whorl-like array cells and epithelia in/around wet keratin and calcification lesions. CONCLUSIONS Our study indicated, for the first time, that osteogenic factor Bmp2 may play an important role in the calcification of ACP via autocrine or paracrine mechanisms. Given the presence of osteogenic markers (Runx2 and Osterix), craniopharyngioma cells could differentiate into an osteoblast-like lineage, and the process of craniopharyngioma calcification resembles that which occurs in osteogenesis/odontogenesis.
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Affiliation(s)
- Qi Song-Tao
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guang Zhou, China
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NOTCH1 signaling regulates the BMP2/DLX-3 directed osteogenic differentiation of dental follicle cells. Biochem Biophys Res Commun 2013; 443:500-4. [PMID: 24321094 DOI: 10.1016/j.bbrc.2013.11.120] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 11/28/2013] [Indexed: 01/09/2023]
Abstract
Dental follicle cells (DFCs) are dental stem/progenitor cells and the genuine precursors of alveolar osteoblasts and dental cementoblasts. A previous study showed that the transcription factor DLX3 (distal less homeobox 3) supports the osteogenic differentiation in DFCs via a positive feedback loop with the bone morghogenetic protein (BMP) 2. Until today, however, the control of this BMP2/DLX3 pathway by additional signaling pathways remains elusive. Previous studies also suggested that the NOTCH signaling pathway plays a role in the osteogenic differentiation of DFCs. In this study we showed that DLX3 overexpression and the initiation of the osteogenic differentiation by BMP2 or dexamethasone induced the NOTCH signaling pathway in DFCs. However, the induction of NOTCH-signaling impaired not only the osteogenic differentiation (ALP activity and mineralized nodules) but also the expression of the transcription factor DLX3 and the activation of the BMP-signaling pathway. So, NOTCH signaling plays a regulatory role for the osteogenic differentiation of DFCs. In conclusion, results of our study suggest that the NOTCH-signaling pathway, which is activated during the osteogenic differentiation of DFCs, regulates the BMP2/DLX3 directed differentiation of DFCs via a negative feed-back loop.
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Kanaya S, Nemoto E, Sakisaka Y, Shimauchi H. Calcium-mediated increased expression of fibroblast growth factor-2 acts through NF-κB and PGE2/EP4 receptor signaling pathways in cementoblasts. Bone 2013; 56:398-405. [PMID: 23851295 DOI: 10.1016/j.bone.2013.06.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 05/10/2013] [Accepted: 06/24/2013] [Indexed: 01/27/2023]
Abstract
We reported previously that cementoblasts are provided with sensing mechanisms for extracellular Ca2+ and that elevated extracellular Ca2+ increases fibroblast growth factor-2 (FGF-2) gene and protein expression levels via a cyclic AMP/protein kinase A (PKA) dependent pathway. In the present study, we found that stimulation of murine cementoblasts with 10 mM CaCl2 induced cyclooxygenase-2 (COX-2) gene expression and prostaglandin E2 (PGE2) biosynthesis. NS-398, a COX-2 inhibitor, significantly reduced CaCl2-induced increase in Fgf-2 gene expression, indicating that PGE2 synthesized by COX-2 may be involved in FGF-2 induction. The inhibitory effect of NS-398 was restored completely by the addition of PGE2 receptor 4 (E-prostanoid receptor 4, called EP4) agonist, but not agonists for EP1, EP2, and EP3. Furthermore, EP4 antagonist significantly reduced CaCl2-induced Fgf-2 induction, suggesting that it is mediated by EP4 activation. However, stimulation with EP4 agonist alone in the absence of CaCl2 had no effect on the Fgf-2 induction, indicating that EP4 signaling alone is not sufficient. CaCl2 also upregulated gene expression levels of Ep4 and Cox-2, as well as Fgf-2 and induction of these genes was abolished by pretreatment with BMS-345541, a nuclear factor-κB (NF-κB) inhibitor, indicating that NF-κB signaling triggered by CaCl2 is indispensable for FGF-2 induction. Furthermore, CaCl2-induced Fgf-2 induction was synergistically enhanced by the addition of EP4 agonist. This indicates that the signaling triggered via CaCl2 and its combination with EP4 agonist may be useful as a novel strategy for periodontal regeneration.
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Affiliation(s)
- Sousuke Kanaya
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai 980-8575, Japan
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Bone morphogenetic protein-2 gene controls tooth root development in coordination with formation of the periodontium. Int J Oral Sci 2013; 5:75-84. [PMID: 23807640 PMCID: PMC3707077 DOI: 10.1038/ijos.2013.41] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 05/17/2013] [Indexed: 01/02/2023] Open
Abstract
Formation of the periodontium begins following onset of tooth-root formation in a coordinated manner after birth. Dental follicle progenitor cells are thought to form the cementum, alveolar bone and Sharpey's fibers of the periodontal ligament (PDL). However, little is known about the regulatory morphogens that control differentiation and function of these progenitor cells, as well as the progenitor cells involved in crown and root formation. We investigated the role of bone morphogenetic protein-2 (Bmp2) in these processes by the conditional removal of the Bmp2 gene using the Sp7-Cre-EGFP mouse model. Sp7-Cre-EGFP first becomes active at E18 in the first molar, with robust Cre activity at postnatal day 0 (P0), followed by Cre activity in the second molar, which occurs after P0. There is robust Cre activity in the periodontium and third molars by 2 weeks of age. When the Bmp2 gene is removed from Sp7(+) (Osterix(+)) cells, major defects are noted in root, cellular cementum and periodontium formation. First, there are major cell autonomous defects in root-odontoblast terminal differentiation. Second, there are major alterations in formation of the PDLs and cellular cementum, correlated with decreased nuclear factor IC (Nfic), periostin and α-SMA(+) cells. Third, there is a failure to produce vascular endothelial growth factor A (VEGF-A) in the periodontium and the pulp leading to decreased formation of the microvascular and associated candidate stem cells in the Bmp2-cKO(Sp7-Cre-EGFP). Fourth, ameloblast function and enamel formation are indirectly altered in the Bmp2-cKO(Sp7-Cre-EGFP). These data demonstrate that the Bmp2 gene has complex roles in postnatal tooth development and periodontium formation.
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