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Bakr MM, Shamel M, Raafat SN, Love RM, Al‐Ankily MM. Effect of pulp capping materials on odontogenic differentiation of human dental pulp stem cells: An in vitro study. Clin Exp Dent Res 2024; 10:e816. [PMID: 38053499 PMCID: PMC10860438 DOI: 10.1002/cre2.816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 10/25/2023] [Accepted: 10/31/2023] [Indexed: 12/07/2023] Open
Abstract
OBJECTIVES Migration and differentiation of human dental pulp stem cells (hDPSCs) is a vital and key factor in the success of reparative dentin formation for maintenance of pulp vitality. Pulp capping materials are used to stimulate DPSCs to induce new dentin formation. Thus, the aim of the present study was to compare the response of DPSCs to four commercially available pulp capping materials: a bioactive bioceramic (Material 1), a nonresinous ready-to-use bioceramic cement (Material 2), a bioactive composite (Material 3), and a biocompatible, dual-cured, resin-modified calcium silicate (Material 4). MATERIALS AND METHODS hDPSCs were isolated and cultured from freshly extracted teeth and were then characterized by flow cytometry and multilineage differentiation. Discs prepared from pulp capping materials were tested with hDPSCs and MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, cell migration assay and odontogenic differentiation assay was performed. Expression of osteogenic markers (osteopontin, RUNX family transcription factor 2, osteocalcin) and the odontogenic marker (dentin sialophosphoprotein) was detected using reverse transcription-polymerase chain reaction. RESULTS Materials 1, 2, and 3 generated more cell viability than Material 4. Furthermore, Material 4 showed the least wound exposure percentage, while Material 3 showed the highest percentage. Enhanced mineralization was found in hDSCPs cultured with Material 3, followed by Material 1, and then Material 2, while Material 4 revealed the least calcified mineralization. CONCLUSIONS The results of this study were inconclusive regards contemporary bioceramic materials designed for vital pulp therapy as they have different effects on hDPSC. Further testing for cytotoxicity using live-dead staining, animal experiments, clinical trials, and independent analyses of these biomaterials is necessary for clinicians to make an informed decision for their use.
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Affiliation(s)
- Mahmoud M. Bakr
- School of Medicine and DentistryGriffith UniversityGold CoastQueenslandAustralia
| | - Mohamed Shamel
- Oral Biology Department, Faulty of DentistryThe British University in EgyptCairoEgypt
| | - Shereen N. Raafat
- Department of Pharmacology and Toxicology, Faculty of DentistryThe British University in EgyptCairoEgypt
| | - Robert M. Love
- School of Medicine and DentistryGriffith UniversityGold CoastQueenslandAustralia
| | - Mahmoud M. Al‐Ankily
- Oral Biology Department, Faulty of DentistryThe British University in EgyptCairoEgypt
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2
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Widbiller M, Galler KM. Engineering the Future of Dental Health: Exploring Molecular Advancements in Dental Pulp Regeneration. Int J Mol Sci 2023; 24:11453. [PMID: 37511210 PMCID: PMC10380375 DOI: 10.3390/ijms241411453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/02/2023] [Indexed: 07/30/2023] Open
Abstract
Protected by the surrounding mineralized barriers of enamel, dentin, and cementum, dental pulp is a functionally versatile tissue that fulfills multiple roles [...].
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Affiliation(s)
- Matthias Widbiller
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, D-93093 Regensburg, Germany
| | - Kerstin M Galler
- Department of Operative Dentistry and Periodontology, Friedrich-Alexander-University Erlangen-Nuernberg, D-91054 Erlangen, Germany
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3
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Spagnuolo G, De Luca I, Iaculli F, Barbato E, Valletta A, Calarco A, Valentino A, Riccitiello F. Regeneration of dentin-pulp complex: Effect of calcium-based materials on hDPSCs differentiation and gene expression. Dent Mater 2023; 39:485-491. [PMID: 36935304 DOI: 10.1016/j.dental.2023.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/07/2023] [Accepted: 03/11/2023] [Indexed: 03/19/2023]
Abstract
OBJECTIVE Dentin-pulp complex is object of interest in the regenerative endodontic field as well as the natural function of human dental pulp stem cells (hDPSCs) that may differentiate into specific cells able to repair and/or regenerate both hard and soft dental structures. The aim of the present study was to evaluate the capacity of hDPSCs to differentiate in odontoblastic-like cells by evaluating the expression of specific odontogenic-related genes and to prove the ability of treatment with calcium-based materials such as calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)₂), and mineral trioxide aggregate (MTA). METHODS hDPSCs were obtained and isolated from a third molar of a young patient. Odontogenic-related gene expression was assessed unti1 28 days of culture as well as alkaline phosphatase activity (ALP). hDPSCs were cultured in odontoblastic-induction medium used as control, and in presence of different concentrations of CaCO3, Ca(OH)₂, and MTA. RESULTS The results demonstrated an upregulation in odontoblastic cell-related genes, in particular of the early differentiation marker known as matrix extracellular phosphoglycoprotein (MEPE), as well as increased ALP activity and the presence of calcium deposits, mainly by stimulation with calcium derivatives. In this regard, treatment of pulp tissue with CaCO3, Ca(OH)2 and even better with MTA seemed to be effective for dentinogenesis. SIGNIFICANCE The ease of isolation of hDPSCs from discarded or extracted teeth offers a promising source of autologous cells that may be applied for regenerative purpose in combination with selected bioactive materials. However, further investigations should be conducted to confirm the obtained results.
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Affiliation(s)
- Gianrico Spagnuolo
- Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy
| | - Ilenia De Luca
- Research Institute on Terrestrial Ecosystems (IRET)-CNR, Naples, Italy
| | - Flavia Iaculli
- Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy.
| | - Eleonora Barbato
- Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy
| | - Alessandra Valletta
- Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy
| | - Anna Calarco
- Research Institute on Terrestrial Ecosystems (IRET)-CNR, Naples, Italy
| | - Anna Valentino
- Research Institute on Terrestrial Ecosystems (IRET)-CNR, Naples, Italy.
| | - Francesco Riccitiello
- Department of Neuroscience, Reproductive Sciences and Dentistry, University of Naples Federico II, Naples, Italy
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4
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Segura-Egea JJ, Cabanillas-Balsera D, Martín-González J, Cintra LTA. Impact of systemic health on treatment outcomes in endodontics. Int Endod J 2023; 56 Suppl 2:219-235. [PMID: 35752972 DOI: 10.1111/iej.13789] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 06/22/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND The healing of periapical lesions after root canal treatment (RCT) is not the result of the curative action of the treatment. The process of healing begins with inflammation, and is resolved by the clearance of the immunogen that induces the immune response. Then, the periapical tissue itself carries out the healing of the periapical lesion, by repair or by a combination of repair and regeneration, depending on the host's reparative response working properly. The ultimate objective of RCT is to achieve wound healing by removing the source of bacterial antigens and toxins, allowing chronic inflammatory tissue to become reparative tissue. Some systemic conditions increase the susceptibility of the host to infection or impair the tissue reparative response, maintaining the inflammatory process and periapical bone resorption after RCT. This can cause the failure of RCT and even the need for extraction of the affected tooth. OBJECTIVE To analyse the scientific literature on the possible influence of systemic conditions on the treatment outcomes in endodontics, as well as to discuss the biological mechanisms that may be involved. METHODS The search was carried out in PubMed, SCOPUS and EMBASE. The inclusion criteria established were original scientific articles reporting data about some systemic condition in relation to treatment outcomes in endodontics, including clinical studies and studies carried out in animal models. RESULTS Systemic factors (age, nutrition, stress, hormones, smoking habits), and systemic diseases, such as diabetes, cardiovascular diseases, osteoporosis, HIV infection, inflammatory bowel disease, and others, can influence or interfere in the repair of periapical tissues after RCT. DISCUSSION Some of these systemic diseases can alter bone turnover and fibroblast function, preventing or delaying periapical wound healing. Others can alter the microvasculature, reducing nutrients and oxygen supply to periapical tissues. As a result, these systemic conditions can decrease the success rate of RCT and provoke incomplete wound healing (typically granulomatous tissue formation) in the periapical region. CONCLUSIONS The results of this narrative review show worse success rate of RCT, with higher percentage of postoperative radiolucent periapical lesions and higher proportion of non-retained teeth (RFT), associated with several systemic conditions, such as smoking habits and diabetes.
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Affiliation(s)
- Juan J Segura-Egea
- Endodontic Section, Department of Stomatology, School of Dentistry, University of Sevilla, Sevilla, Spain
| | - Daniel Cabanillas-Balsera
- Endodontic Section, Department of Stomatology, School of Dentistry, University of Sevilla, Sevilla, Spain
| | - Jenifer Martín-González
- Endodontic Section, Department of Stomatology, School of Dentistry, University of Sevilla, Sevilla, Spain
| | - Luciano T A Cintra
- Endodontic Section, Department of Preventive and Restorative Dentistry, School of Dentistry, São Paulo State University (Unesp), São Paulo, Brazil
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5
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Aubeux D, Renard E, Pérez F, Tessier S, Geoffroy V, Gaudin A. Review of Animal Models to Study Pulp Inflammation. FRONTIERS IN DENTAL MEDICINE 2021. [DOI: 10.3389/fdmed.2021.673552] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Human dental pulp is a highly dynamic tissue equipped with a network of resident immunocompetent cells that play a major role in the defense against pathogens and during tissue injury. Animal studies are mandatory and complementary to in vitro experiments when studying the physiopathology of dental pulp, new diagnostic tools, or innovative therapeutic strategies. This animal approach makes it possible to define a benefit-risk ratio necessary to be subsequently tested in humans. Among the animal kingdom, rodents, rabbits, ferrets, swine, dogs, and non-human primates have been used to model human pulpitis. The diversity of animals found in studies indicate the difficulty of choosing the correct and most efficient model. Each animal model has its own characteristics that may be advantageous or limiting, according to the studied parameters. These elements have to be considered in preclinical studies. This article aims to provide a thorough understanding of the different animal models used to study pulp inflammation. This may help to find the most pertinent or appropriate animal model depending on the hypothesis investigated and the expected results.
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Manaspon C, Jongwannasiri C, Chumprasert S, Sa-Ard-Iam N, Mahanonda R, Pavasant P, Porntaveetus T, Osathanon T. Human dental pulp stem cell responses to different dental pulp capping materials. BMC Oral Health 2021; 21:209. [PMID: 33902558 PMCID: PMC8074430 DOI: 10.1186/s12903-021-01544-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 04/01/2021] [Indexed: 12/28/2022] Open
Abstract
Background Direct pulp capping is a vital pulp therapy for a pin-point dental pulp exposure. Applying a pulp capping material leads to the formation of a dentin bridge and protects pulp vitality. The aim of this study was to compare the effects of four dental materials, DyCal®, ProRoot® MTA, Biodentine™, and TheraCal™ LC in vitro. Methods Human dental pulp stem cells (hDPs) were isolated and characterized. Extraction medium was prepared from the different pulp capping materials. The hDP cytotoxicity, proliferation, and migration were examined. The odonto/osteogenic differentiation was determined by alkaline phosphatase, Von Kossa, and alizarin red s staining. Osteogenic marker gene expression was evaluated using real-time polymerase chain reaction. Results ProRoot® MTA and Biodentine™ generated less cytotoxicity than DyCal® and TheraCal™ LC, which were highly toxic. The hDPs proliferated when cultured with the ProRoot® MTA and Biodentine™ extraction media. The ProRoot® MTA and Biodentine™ extraction medium induced greater cell attachment and spreading. Moreover, the hDPs cultured in the ProRoot® MTA or Biodentine™ extraction medium migrated in a similar manner to those in serum-free medium, while a marked reduction in cell migration was observed in the cells cultured in DyCal® and TheraCal™ LC extraction media. Improved mineralization was detected in hDPs maintained in ProRoot® MTA or Biodentine™ extraction medium compared with those in serum-free medium. Conclusion This study demonstrates the favorable in vitro biocompatibility and bioactive properties of ProRoot® MTA and Biodentine™ on hDPs, suggesting their superior regenerative potential compared with DyCal® and TheraCal™. Supplementary Information The online version contains supplementary material available at 10.1186/s12903-021-01544-w.
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Affiliation(s)
- Chawan Manaspon
- Dental Stem Cell Biology Research Unit, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand.,Biomedical Engineering Institute, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Chavin Jongwannasiri
- Faculty of Medicine and Public Health, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy, Bangkok, 10210, Thailand
| | - Sujin Chumprasert
- Oral Biology Research Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Noppadol Sa-Ard-Iam
- Immunology Research Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Rangsini Mahanonda
- Immunology Research Center, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand.,Department of Periodontology, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Prasit Pavasant
- Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Thantrira Porntaveetus
- Genomics and Precision Dentistry Research Unit, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
| | - Thanaphum Osathanon
- Dental Stem Cell Biology Research Unit, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand. .,Department of Anatomy, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand.
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7
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Luo W, Zhang L, Huang B, Zhang H, Zhang Y, Zhang F, Liang P, Chen Q, Cheng Q, Tan D, Tan Y, Song J, Zhao T, Haydon RC, Reid RR, Luu HH, Lee MJ, El Dafrawy M, Ji P, He TC, Gou L. BMP9-initiated osteogenic/odontogenic differentiation of mouse tooth germ mesenchymal cells (TGMCS) requires Wnt/β-catenin signalling activity. J Cell Mol Med 2021; 25:2666-2678. [PMID: 33605035 PMCID: PMC7933933 DOI: 10.1111/jcmm.16293] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 01/01/2021] [Accepted: 01/04/2021] [Indexed: 12/18/2022] Open
Abstract
Teeth arise from the tooth germ through sequential and reciprocal interactions between immature epithelium and mesenchyme during development. However, the detailed mechanism underlying tooth development from tooth germ mesenchymal cells (TGMCs) remains to be fully understood. Here, we investigate the role of Wnt/β‐catenin signalling in BMP9‐induced osteogenic/odontogenic differentiation of TGMCs. We first established the reversibly immortalized TGMCs (iTGMCs) derived from young mouse mandibular molar tooth germs using a retroviral vector expressing SV40 T antigen flanked with the FRT sites. We demonstrated that BMP9 effectively induced expression of osteogenic markers alkaline phosphatase, collagen A1 and osteocalcin in iTGMCs, as well as in vitro matrix mineralization, which could be remarkably blunted by knocking down β‐catenin expression. In vivo implantation assay revealed that while BMP9‐stimulated iTGMCs induced robust formation of ectopic bone, knocking down β‐catenin expression in iTGMCs remarkably diminished BMP9‐initiated osteogenic/odontogenic differentiation potential of these cells. Taken together, these discoveries strongly demonstrate that reversibly immortalized iTGMCs retained osteogenic/odontogenic ability upon BMP9 stimulation, but this process required the participation of canonical Wnt signalling both in vitro and in vivo. Therefore, BMP9 has a potential to be applied as an efficacious bio‐factor in osteo/odontogenic regeneration and tooth engineering. Furthermore, the iTGMCs may serve as an important resource for translational studies in tooth tissue engineering.
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Affiliation(s)
- Wenping Luo
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Linghuan Zhang
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA.,Department of Respiratory Diseases, Stem Cell Biology and Therapy Laboratory, Ministry of Education Key Laboratory of Child Development and Disorders, The Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Huang
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA.,Department of Clinical Laboratory, Jiangxi Province Key Laboratory of Laboratory Medicine, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Hongmei Zhang
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Yan Zhang
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Fugui Zhang
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Panpan Liang
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Qiuman Chen
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Qianyu Cheng
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Dongmei Tan
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Yi Tan
- Laboratory Animal Center, Chongqing Medical University, Chongqing, China
| | - Jinlin Song
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Tianyu Zhao
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Rex C Haydon
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Russell R Reid
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA.,Department of Surgery, Section of Plastic and Reconstructive Surgery, The University of Chicago Medical Center, Chicago, IL, USA
| | - Hue H Luu
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Michael J Lee
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Mostafa El Dafrawy
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Ping Ji
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China.,Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China
| | - Tong-Chuan He
- Department of Orthopaedic Surgery and Rehabilitation Medicine, Molecular Oncology Laboratory, The University of Chicago Medical Center, Chicago, IL, USA
| | - Liming Gou
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatological Hospital of Chongqing Medical University, Chongqing, China
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8
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Abstract
Over the past 100 y, tremendous progress has been made in the fields of dental tissue engineering and regenerative dental medicine, collectively known as translational dentistry. Translational dentistry has benefited from the more mature field of tissue engineering and regenerative medicine (TERM), established on the belief that biocompatible scaffolds, cells, and growth factors could be used to create functional, living replacement tissues and organs. TERM, created and pioneered by an interdisciplinary group of clinicians, biomedical engineers, and basic research scientists, works to create bioengineered replacement tissues that provide at least enough function for patients to survive until donor organs are available and, at best, fully functional replacement organs. Ultimately, the goal of both TERM and regenerative dentistry is to bring new and more effective therapies to the clinic to treat those in need. Very recently, the National Institutes of Health/National Institute of Dental and Craniofacial Research invested $24 million over a 3-y period to create dental oral and craniofacial translational resource centers to facilitate the development of more effective therapies to treat edentulism and other dental-related diseases over the next decade. This exciting era in regenerative dentistry, particularly for whole-tooth tissue engineering, builds on many key successes over the past 100 y that have contributed toward our current knowledge and understanding of signaling pathways directing natural tooth and dental tissue development-the foundation for current strategies to engineer functional, living replacement dental tissues and whole teeth. Here we use a historical perspective to present key findings and pivotal advances made in the field of translational dentistry over the past 100 y. We will first describe how this process has evolved over the past 100 y and then hypothesize on what to expect over the next century.
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Affiliation(s)
- P C Yelick
- Tufts University School of Dental Medicine, Division of Craniofacial and Molecular Genetics, Department of Orthodontics, Boston, MA, USA
| | - P T Sharpe
- Kings College London Dental Institute, London, UK
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9
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Kim MR, Choi SH, Lee BN, Min KS, Hwang YC. Effect of parathyroid hormone-related protein on odontogenic differentiation in human dental pulp cells. BMC Oral Health 2020; 20:101. [PMID: 32276610 PMCID: PMC7146980 DOI: 10.1186/s12903-020-01085-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 03/25/2020] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Parathyroid hormone-related protein (PTHrP) plays an important role in many physiological processes, including bone regeneration. The function of PTHrP is similar to PTH. It promotes osteogenic differentiation in MC3T3-E1 cells. The aim of this study was to investigate whether PTHrP might have odontogenic differentiation ability in human dental pulp cells (hDPCs). METHODS The viability of hDPCs after stimulation with PTHrP was measured. Real-time polymerase chain reaction and Western blot analysis were performed to evaluate the expression levels of odontogenic markers and activation of protein kinase B (PKB/AKT), extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38 mitogen-activated protein kinase (MAPK). To evaluate mineralized nodule formation, alkaline phosphatase (ALP) staining and alizarin red S staining were performed. RESULTS PTHrP promoted odontogenic differentiation as evidenced by the formation of mineralized nodules, the induction of ALP activity, and the upregulation of odontogenic markers (dentin sialophosphoprotein and dentin matrix protein-1). The phosphorylation of AKT, ERK, JNK, and p38 was increased by PTHrP. However, an AKT inhibitor (LY294002), an ERK inhibitor (U0126), a JNK inhibitor (SP600125), and a p38 inhibitor (SB203580) inhibited the increase of mineralization induced by PTHrP. CONCLUSION The present study revealed that PTHrP could promote odontogenic differentiation and mineralization through activating the AKT, ERK, JNK, and p38 signaling pathways. These results provide novel insights into the odontogenic action of PTHrP.
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Affiliation(s)
- Mi-Ra Kim
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Youngbong-ro 77, Buk-gu, Gwangju, 61186, South Korea
| | - Sung-Hyeon Choi
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Youngbong-ro 77, Buk-gu, Gwangju, 61186, South Korea
| | - Bin-Na Lee
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Youngbong-ro 77, Buk-gu, Gwangju, 61186, South Korea
| | - Kyung-San Min
- Department of Conservative Dentistry, School of Dentistry, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, 54896, South Korea
| | - Yun-Chan Hwang
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Youngbong-ro 77, Buk-gu, Gwangju, 61186, South Korea.
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10
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desJardins-Park HE, Mascharak S, Chinta MS, Wan DC, Longaker MT. The Spectrum of Scarring in Craniofacial Wound Repair. Front Physiol 2019; 10:322. [PMID: 30984020 PMCID: PMC6450464 DOI: 10.3389/fphys.2019.00322] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Accepted: 03/11/2019] [Indexed: 12/11/2022] Open
Abstract
Fibrosis is intimately linked to wound healing and is one of the largest causes of wound-related morbidity. While scar formation is the normal and inevitable outcome of adult mammalian cutaneous wound healing, scarring varies widely between different anatomical sites. The spectrum of craniofacial wound healing spans a particularly diverse range of outcomes. While most craniofacial wounds heal by scarring, which can be functionally and aesthetically devastating, healing of the oral mucosa represents a rare example of nearly scarless postnatal healing in humans. In this review, we describe the typical wound healing process in both skin and the oral cavity. We present clinical correlates and current therapies and discuss the current state of research into mechanisms of scarless healing, toward the ultimate goal of achieving scarless adult skin healing.
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Affiliation(s)
- Heather E. desJardins-Park
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
| | - Shamik Mascharak
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
| | - Malini S. Chinta
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
| | - Derrick C. Wan
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
| | - Michael T. Longaker
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
- Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, United States
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11
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Liu Y, Dong N, Miao J, Li C, Wang X, Ruan J. Lin28 promotes dental pulp cell proliferation via upregulation of cyclin-dependent proteins and interaction with let-7a/IGF2BP2 pathways. Biomed Pharmacother 2019; 113:108742. [PMID: 30851545 DOI: 10.1016/j.biopha.2019.108742] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 02/23/2019] [Accepted: 02/25/2019] [Indexed: 01/23/2023] Open
Abstract
Caries, pulpitis, and trauma are the main causes of dental pulp damage. The regeneration capacity of dental pulp declines with age. Lin28 is a conserved RNA-binding protein in higher eukaryotes that regulates several important cellular functions associated with development, glucose metabolism, differentiation, and pluripotency. Conditional reactivation of Lin28 gene in adult mice markedly accelerates the wound-healing process in injured digits. However, little is known about its functions and molecular mechanism in human dental pulp. The aim of this study was to investigate the effects and mechanism of overexpression of Lin28 gene on the proliferation of human dental pulp cells (HDPCs). For this purpose, a number of molecular and biochemical analytical techniques, including the ethynyl-2'-deoxyuridine (EdU) incorporation assay, RNA-protein immunoprecipitation (RIP) analysis, and luciferase assays, were used for detailed characterization. In addition, factors regulating HDPCs activation were explored through gain-of-function and loss-of-function analyses. The results demonstrate that Lin28 promotes cell proliferation and the S-G2/M transition of HDPCs and directly binds to a group of cell cycle regulatory mRNAs in HDPCs. Through bioinformatics analysis and luciferase assays, we confirmed that let-7a targets IGF2BP2. Silencing of IGF2BP2 showed similar cellular and molecular effects as let-7a. Similarly, restoration of IGF2BP2 counteracted the effects of let-7a expression. In conclusion, Lin28 promotes cell proliferation by regulation of both mRNA translation (let-7-independent) and miRNA biogenesis (let-7-dependent). Lin28 can promote the expression of pro-proliferative genes by directly enhancing their translation to maintain a tight control over HDPC proliferation.
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Affiliation(s)
- Yan Liu
- Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, 98 Xiwu Road, Xi'an, Shaanxi, 710004, People's Republic of China
| | - Ning Dong
- Department of Pediatric Dentistry, College of Stomatology, Xi'an Jiaotong University, 98 Xiwu Road, Xi'an, Shaanxi, 710004, People's Republic of China
| | - Jiyu Miao
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, People's Republic of China
| | - Chenxing Li
- Department of Pharmacology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, People's Republic of China
| | - Xiaofei Wang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, 710061, People's Republic of China
| | - Jianping Ruan
- Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, Department of Preventive Dentistry, College of Stomatology, Xi'an Jiaotong University, 98 Xiwu Road, Xi'an, Shaanxi, 710004, People's Republic of China.
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12
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Coelho MC, Sanchez PKV, Fernandes RR, Souza FPPD, Siéssere S, Bombonato-Prado KF. Effect of grape seed extract (GSE) on functional activity and mineralization of OD-21 and MDPC-23 cell lines. Braz Oral Res 2019; 33:e013. [PMID: 30758410 DOI: 10.1590/1807-3107bor-2019.vol33.0013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 01/14/2019] [Indexed: 11/21/2022] Open
Abstract
Recent studies on functional tissue regeneration have focused on substances that favor cell proliferation and differentiation, including the bioactive phenolic compounds present in grape seed extract (GSE). The aim of this investigation was to evaluate the stimulatory potential of GSE in the functional activity of undifferentiated pulp cells and odontoblast-like cells. OD-21 and MDPC-23 cell lines were cultivated in odontogenic medium until subconfluence, seeded in 24-well culture plates in a concentration of 2x104/well and divided into: 1) OD-21 without GSE; 2) OD-21+10 µg/mL of GSE; 3) MDPC-23 without GSE; 4) MDPC-23+10 µg/mL of GSE. Cell proliferation, in situ detection of alkaline phosphatase (ALP) and total protein content were assessed after 3, 7 and 10 days, and mineralization was evaluated after 14 days. The data were analyzed by ANOVA statistical tests set at a 5% level of significance. Results revealed that cell proliferation increased after 10 days, and protein content, after 7 days of culture in MDPC-23 cells. In situ ALP staining intensity was higher in undifferentiated pulp cells and odontoblast-like cells after 7 and 10 days, respectively. A discrete increase in MDPC-23 mineralization after GSE treatment was observed despite OD-21 cells presenting a decrease in mineralized nodule deposits. Data suggest that GSE favors functional activity of differentiated cells more broadly than undifferentiated cells (OD-21). More studies with different concentrations of GSE must be conducted to confirm its benefits to cells regarding dentin regeneration.
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Affiliation(s)
- Maria Carolina Coelho
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Paula Katherine Vargas Sanchez
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Roger Rodrigo Fernandes
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Oral and Maxillofacial Surgery and Periodontology, Ribeirão Preto, SP, Brazil
| | - Fernanda Panzeri Pires de Souza
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthesis, Ribeirão Preto, SP, Brazil
| | - Selma Siéssere
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
| | - Karina Fittipaldi Bombonato-Prado
- Universidade de São Paulo - USP, School of Dentistry of Ribeirão Preto, Department of Basic and Oral Biology, Ribeirão Preto, SP, Brazil
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13
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The role of stem cell therapy in regeneration of dentine-pulp complex: a systematic review. Prog Biomater 2018; 7:249-268. [PMID: 30267369 PMCID: PMC6304177 DOI: 10.1007/s40204-018-0100-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 09/12/2018] [Indexed: 12/16/2022] Open
Abstract
Infection of the dental pulp will result in inflammation and eventually tissue necrosis which is treated conventionally by pulpectomy and root canal treatment. Advances in regenerative medicine and tissue engineering along with the introduction of new sources of stem cells have led to the possibility of pulp tissue regeneration. This systematic review analyzes animal studies published since 2010 to determine the ability of stem cell therapy to regenerate the dentine-pulp complex (DPC) and the success of clinical protocols. In vitro and human clinical studies are excluded and only the experimental studies on animal models were included. Dental pulp stem cells constitute the most commonly used cell type. The majority of stem cells are incorporated into various types of scaffold and implanted into root canals. Some of the studies combine growth factors with stem cells in an attempt to improve the outcome. Studies of ectopic transplantation using small animal models are simple and non-systematic evaluation techniques. Stem cell concentrations have not been so far reported; therefore, the translational value of such animal studies remains questionable. Though all types of stem cells appear capable of regenerating a dentine-pulp complex, still several factors have been considered in selecting the cell type. Co-administrative factors are essential for inducing the systemic migration of stem cells, and their vascularization and differentiation into odontoblast-like cells. Scaffolds provide a biodegradable structure able to control the release of growth factors. To identify problems and reduce costs, novel strategies should be initially tested in subcutaneous or renal capsule implantation followed by root canal models to confirm results.
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14
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Application of a direct pulp capping cement containing S-PRG filler. Clin Oral Investig 2018; 23:1723-1731. [PMID: 30159805 DOI: 10.1007/s00784-018-2596-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES To evaluate new pulp capping cements containing surface pre-reacted glass ionomer (S-PRG) filler and to investigate ion release kinetics and pH shift of eluates from the cement. MATERIALS AND METHODS Molars of Wistar rats were directly pulp capped using three kinds of cement containing S-PRG filler and mineral tri-oxide aggregate (MTA) was used as a control. After 1, 2, or 4 weeks, histological evaluation was performed and differences of tertiary dentin formation were analyzed. Release of Sr2+, BO33-, SiO32-, Na+, and Al3+ ions was determined by inductively coupled plasma-atomic emission spectrometry, and F- ion release was measured using a fluoride ion selective electrode. The pH of the eluate from each cement after mixing was measured with a pH electrode. RESULTS One of S-PRG cements promoted tertiary dentin formation to the same extent as the control (p > 0.05) and it showed a tendency of less inflammatory response. This cement released more BO33- and SiO32-, but less Sr2+, Na+, and F- than other S-PRG specimens. Each cement recovered nearly neutral compared with glass ionomer cement. CONCLUSIONS S-PRG cement induced tertiary dentin formation based on multiple ion releases, suggesting that it is suitable as a pulp capping material. CLINICAL RELEVANCE This new material can be an alternative pulp capping agent to MTA.
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15
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Song M, Yu B, Kim S, Hayashi M, Smith C, Sohn S, Kim E, Lim J, Stevenson RG, Kim RH. Clinical and Molecular Perspectives of Reparative Dentin Formation: Lessons Learned from Pulp-Capping Materials and the Emerging Roles of Calcium. Dent Clin North Am 2018; 61:93-110. [PMID: 27912821 DOI: 10.1016/j.cden.2016.08.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The long-term use of calcium hydroxide and the recent increase in the use of hydraulic calcium-silicate cements as direct pulp-capping materials provide important clues in terms of how reparative dentin may be induced to form a "biological seal" to protect the underlying pulp tissues. In this review article, we discuss clinical and molecular perspectives of reparative dentin formation based on evidence learned from the use of these pulp-capping materials. We also discuss the emerging role of calcium as an odontoinductive component in these pulp-capping materials.
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Affiliation(s)
- Minju Song
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA; Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Bo Yu
- Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Sol Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA; Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Marc Hayashi
- Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Colby Smith
- Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Suhjin Sohn
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Euiseong Kim
- Microscope Center, Department of Conservative Dentistry, Oral Science Research Center, Yonsei University College of Dentistry, 50 Yonsei-Ro, 03772, Seoul, Korea
| | - James Lim
- Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Richard G Stevenson
- Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
| | - Reuben H Kim
- The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA; Section of Restorative Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.
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16
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Cai S, Zhang W, Tribble G, Chen W. Reactions of human dental pulp cells to capping agents in the presence or absence of bacterial exposure. J Oral Sci 2018; 59:621-627. [PMID: 29279572 DOI: 10.2334/josnusd.16-0625] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
An ideal pulp-capping agent needs to have good biocompatibility and promote reparative dentinogenesis. Although the effects of capping agents on healthy pulp are known, limited data regarding their effects on bacterial contaminated pulp are available. This study aimed to evaluate the reaction of contaminated pulps to various capping agents to assist clinicians in making informed decisions. Human dental pulp (HDP) cell cultures were developed from extracted human molars. The cells were exposed to a bacterial cocktail comprising Porphyromonas gingivalis, Prevotella intermedia, and Streptococcus gordonii before being cocultured with capping agents such as mineral trioxide aggregate (MTA) Portland cement (PC), and Dycal. HDP cell proliferation was assayed by MTS colorimetric cell proliferation assay, and its differentiation was evaluated by real-time PCR for detecting alkaline phosphatase, dentin sialophosphoprotein, and osteocalcin expressions. MTA and PC had no apparent effect, whereas Dycal inhibited HDP cell proliferation. PC stimulated HDP cell differentiation, particularly when they were exposed to bacteria. MTA and Dycal inhibited differentiation, regardless of bacterial infection. In conclusion, PC was the most favorable agent, followed by MTA, and Dycal was the least favorable agent for supporting the functions of bacterial compromised pulp cells.
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Affiliation(s)
- Shiwei Cai
- Department of Endodontics, University of Texas School of Dentistry at Houston
| | - Wenjian Zhang
- Department of Diagnostic and Biomedical Sciences, University of Texas School of Dentistry at Houston
| | - Gena Tribble
- Department of Periodontics and Dental hygiene, University of Texas School of Dentistry at Houston
| | - Wei Chen
- Department of Endodontics, University of Texas School of Dentistry at Houston
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17
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Shetty H, Shetty S, Kakade A, Desai R, Zhang CF, Neelakantan P. Cone-beam computed tomographic and histological investigation of regenerative endodontic procedure in an immature mandibular second premolar with chronic apical abscess. ACTA ACUST UNITED AC 2018; 9:e12352. [PMID: 29984903 DOI: 10.1111/jicd.12352] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 05/19/2018] [Indexed: 12/15/2022]
Abstract
AIM The aim of the present study was to investigate the tissue generated after regenerative endodontic procedure (REP) in the root canal space of an immature mandibular second premolar with pulp necrosis and chronic apical abscess using cone-beam computed tomographic (CBCT) and histological methods. METHODS REP was performed in an immature mandibular second premolar. At the 3-year follow up, CBCT scans were taken to evaluate the outcome of treatment. As the tooth was not restorable to function, it was extracted and processed for histological examination. RESULTS CBCT showed a reduction in size of the periradicular radiolucency, with a marginal increase in root length. Apical closure and thickening of the root canal walls were apparent. Histologically, the root canal space was filled with minimally-inflamed fibrous connective tissue. Some cementum-like mineralized connective tissue was evident on the internal canal walls. The apical third showed cementum-like deposits at the apex and the outer canal walls, without dentin formation. CONCLUSIONS The present study of a structurally-failed tooth with prior REP demonstrates that the tissue formed within the root canal space was fibrous connective tissue with cementum-like deposition in the canal space. No evidence of dentin- or pulp-like tissue was found.
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Affiliation(s)
- Heeresh Shetty
- Department of Conservative Dentistry and Endodontics, Nair Hospital Dental College, Mumbai, India
| | - Shishir Shetty
- Department of Conservative Dentistry and Endodontics, A.B. Shetty Memorial Institute of Dental Sciences, Mangalore, India
| | - Adesh Kakade
- Department of Pediatric Dentistry, Nair Hospital Dental College, Mumbai, India
| | - Rajiv Desai
- Department of Oral and Maxillofacial Pathology, Nair Hospital Dental College, Mumbai, India
| | - Cheng F Zhang
- Discipline of Endodontology, Faculty of Dentistry, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Prasanna Neelakantan
- Discipline of Endodontology, Faculty of Dentistry, The University of Hong Kong, Pok Fu Lam, Hong Kong
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18
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Zhao Y, Yuan X, Liu B, Tulu US, Helms JA. Wnt-Responsive Odontoblasts Secrete New Dentin after Superficial Tooth Injury. J Dent Res 2018; 97:1047-1054. [PMID: 29566345 DOI: 10.1177/0022034518763151] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The objective of our experiments was to identify new therapeutic strategies to stimulate dentin formation in an adult tooth. To address this objective, we evaluated dentin production in 2 acute trauma models: one involving a pulp exposure and the other involving a superficial dentin injury. Molecular, cellular, and histologic analyses revealed that in response to a severe injury, where the pulp is exposed to the oral cavity, cell death is rampant and the repair response initiates from surviving pulp cells and, to a lesser extent, surviving odontoblasts. When an injury is superficial, as in the case of a dentin injury model, then disturbances are largely confined to pulp tissue immediately underneath the damaged dentin tubules. We found that the pulp remained vital and innervated; primary odontoblasts upregulated HIF1α; and the rate of mineralization was significantly increased. A tamoxifen-inducible Axin2CreERT2/+; R26R mTmG/+ reporter strain was then used to demonstrate that a population of long-lived Wnt-responsive odontoblasts, which secreted dentin throughout the life of the animal, were responsible for depositing new dentin in response to a superficial injury. Amplifying Wnt signaling in the pulp stimulates dentin secretion, and in the dentin injury model, we show that a liposomal formulation of human WNT3A protein passes through dentinal tubules and is capable of upregulating Wnt signaling in the pulp. These data provide strong proof of concept for a therapeutic pulp-capping material to stimulate Wnt signaling in odontoblasts and thus improve the pulp repair response.
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Affiliation(s)
- Y Zhao
- 1 Department of Oral Basic Science, School of Dentistry, Lanzhou University, Lanzhou, China.,2 Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - X Yuan
- 2 Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - B Liu
- 3 Ankasa Regenerative Therapeutics, Inc., South San Francisco, CA, USA
| | - U S Tulu
- 2 Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - J A Helms
- 2 Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA.,3 Ankasa Regenerative Therapeutics, Inc., South San Francisco, CA, USA
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19
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20
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Politis C, Schoenaers J, Jacobs R, Agbaje JO. Wound Healing Problems in the Mouth. Front Physiol 2016; 7:507. [PMID: 27853435 PMCID: PMC5089986 DOI: 10.3389/fphys.2016.00507] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 10/14/2016] [Indexed: 12/23/2022] Open
Abstract
Wound healing is a primary survival mechanism that is largely taken for granted. The literature includes relatively little information about disturbed wound healing, and there is no acceptable classification describing wound healing process in the oral region. Wound healing comprises a sequence of complex biological processes. All tissues follow an essentially identical pattern to complete the healing process with minimal scar formation. The oral cavity is a remarkable environment in which wound healing occurs in warm oral fluid containing millions of microorganisms. The present review provides a basic overview of the wound healing process and with a discussion of the local and general factors that play roles in achieving efficient would healing. Results of oral cavity wound healing can vary from a clinically healed wound without scar formation and with histologically normal connective tissue under epithelial cells to extreme forms of trismus caused by fibrosis. Many local and general factors affect oral wound healing, and an improved understanding of these factors will help to address issues that lead to poor oral wound healing.
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Affiliation(s)
- Constantinus Politis
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Katholieke Universiteit LeuvenLeuven, Belgium; Oral and Maxillofacial Surgery, Leuven University HospitalsLeuven, Belgium
| | - Joseph Schoenaers
- Oral and Maxillofacial Surgery, Leuven University Hospitals Leuven, Belgium
| | - Reinhilde Jacobs
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Katholieke Universiteit Leuven Leuven, Belgium
| | - Jimoh O Agbaje
- OMFS-IMPATH Research Group, Department of Imaging and Pathology, Katholieke Universiteit LeuvenLeuven, Belgium; Oral and Maxillofacial Surgery, Leuven University HospitalsLeuven, Belgium
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21
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Phung S, Lee C, Hong C, Song M, Yi JK, Stevenson RG, Kang MK, Shin KH, Park NH, Kim RH. Effects of Bioactive Compounds on Odontogenic Differentiation and Mineralization. J Dent Res 2016; 96:107-115. [PMID: 28033065 DOI: 10.1177/0022034516675152] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Direct pulp capping involves the placement of dental materials directly onto vital pulp tissues after deep caries removal to stimulate the regeneration of reparative dentin. This physical barrier will serve as a "biological seal" between these materials and the pulp tissue. Although numerous direct pulp capping materials are available, the use of small bioactive compounds that can potently stimulate and expedite reparative dentin formation is still underexplored. Here, the authors compared and evaluated the pro-osteogenic and pro-odontogenic effects of 4 small bioactive compounds- phenamil (Phen), purmorphamine (Pur), genistein (Gen), and metformin (Met). The authors found that these compounds at noncytotoxic concentrations induced differentiation and mineralization of preosteoblastic MC3T3-E1 cells and preodontoblastic dental pulp stem cells (DPSCs) in a dose-dependent manner. Among them, Phen consistently and potently induced differentiation and mineralization in vitro. A single treatment with Phen was sufficient to enhance the mineralization potential of DPSCs in vitro. More importantly, Phen-treated DPSCs showed enhanced odontogenic differentiation and mineralization in vivo. Our study suggests that these small bioactive compounds merit further study for their potential clinical use as pulp capping materials.
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Affiliation(s)
- S Phung
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA
| | - C Lee
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,2 Section of Restorative Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA
| | - C Hong
- 3 Section of Orthodontics, UCLA School of Dentistry, Los Angeles, CA, USA
| | - M Song
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,2 Section of Restorative Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA
| | - J K Yi
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA
| | - R G Stevenson
- 2 Section of Restorative Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA
| | - M K Kang
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,4 UCLA Jonsson Comprehensive Cancer Center, Los Angeles, CA, USA
| | - K-H Shin
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,4 UCLA Jonsson Comprehensive Cancer Center, Los Angeles, CA, USA
| | - N-H Park
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,4 UCLA Jonsson Comprehensive Cancer Center, Los Angeles, CA, USA.,5 David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - R H Kim
- 1 The Shapiro Family Laboratory of Viral Oncology and Aging Research, UCLA School of Dentistry, Los Angeles, CA, USA.,2 Section of Restorative Dentistry, UCLA School of Dentistry, Los Angeles, CA, USA.,4 UCLA Jonsson Comprehensive Cancer Center, Los Angeles, CA, USA
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22
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Hunter DJ, Bardet C, Mouraret S, Liu B, Singh G, Sadoine J, Dhamdhere G, Smith A, Tran XV, Joy A, Rooker S, Suzuki S, Vuorinen A, Miettinen S, Chaussain C, Helms JA. Wnt Acts as a Prosurvival Signal to Enhance Dentin Regeneration. J Bone Miner Res 2015; 30:1150-9. [PMID: 25556760 DOI: 10.1002/jbmr.2444] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 12/11/2014] [Accepted: 12/23/2014] [Indexed: 01/08/2023]
Abstract
Wnt proteins are lipid-modified, short-range signals that control stem cell self-renewal and tissue regeneration. We identified a population of Wnt responsive cells in the pulp cavity, characterized their function, and then created a pulp injury. The repair response was evaluated over time using molecular, cellular, and quantitative assays. We tested how healing was impacted by wound environments in which Wnt signaling was amplified. We found that a Wnt-amplified environment was associated with superior pulp healing. Although cell death was still rampant, the number of cells undergoing apoptosis was significantly reduced. This resulted in significantly better survival of injured pulp cells, and resulted in the formation of more tertiary dentin. We engineered a liposome-reconstituted form of WNT3A then tested whether this biomimetic compound could activate cells in the injured tooth pulp and stimulate dentin regeneration. Pulp cells responded to the elevated Wnt stimulus by differentiating into secretory odontoblasts. Thus, transiently amplifying the body's natural Wnt response resulted in improved pulp vitality. These data have direct clinical implications for treating dental caries, the most prevalent disease affecting mankind.
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Affiliation(s)
- Daniel J Hunter
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Claire Bardet
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA.,EA 2496, Dental School, University Paris Descartes, Sorbonne Paris Cité, Montrouge, France
| | - Sylvain Mouraret
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA.,Department of Periodontology, Service of Odontology, Rothschild Hospital, Assistance Publique-Hôpitaux de Paris, Paris 7, Université Paris Diderot, Unité de Formation et de Recherche (UFR) of Odontology, Paris, France
| | - Bo Liu
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Gurpreet Singh
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Jérémy Sadoine
- EA 2496, Dental School, University Paris Descartes, Sorbonne Paris Cité, Montrouge, France
| | - Girija Dhamdhere
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Andrew Smith
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA.,Department of Biological Sciences, San Jose State University, San Jose, CA, USA
| | - Xuan Vinh Tran
- EA 2496, Dental School, University Paris Descartes, Sorbonne Paris Cité, Montrouge, France
| | - Adrienne Joy
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Scott Rooker
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
| | - Shigeki Suzuki
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA.,Department of Dental Science for Health Promotion, Division of Cervico-Gnathostomatology Hiroshima, University Graduate School of Biomedical Sciences, Hiroshima, Japan
| | - Annukka Vuorinen
- BioMediTech, Adult Stem Cell Research, University of Tampere, Tampere, Finland.,Finnish Student Health Service, Tampere, Finland
| | - Susanna Miettinen
- BioMediTech, Adult Stem Cell Research, University of Tampere, Tampere, Finland.,Science Centre, University of Tampere, Tampere, Finland
| | - Catherine Chaussain
- EA 2496, Dental School, University Paris Descartes, Sorbonne Paris Cité, Montrouge, France
| | - Jill A Helms
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA
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Ajay Sharma L, Ali MA, Love RM, Wilson MJ, Dias GJ. Novel keratin preparation supports growth and differentiation of odontoblast-like cells. Int Endod J 2015; 49:471-82. [DOI: 10.1111/iej.12476] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 05/24/2015] [Indexed: 12/30/2022]
Affiliation(s)
- L. Ajay Sharma
- Department of Anatomy; University of Otago; Dunedin New Zealand
| | - M. A. Ali
- Department of Applied Sciences; University of Otago; Dunedin New Zealand
| | - R. M. Love
- Department of Oral Rehabilitation; University of Otago; Dunedin New Zealand
| | - M. J. Wilson
- Department of Anatomy; University of Otago; Dunedin New Zealand
| | - G. J. Dias
- Department of Anatomy; University of Otago; Dunedin New Zealand
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24
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The expression of periostin in dental pulp cells. Arch Oral Biol 2015; 60:760-7. [DOI: 10.1016/j.archoralbio.2015.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 01/12/2015] [Accepted: 02/07/2015] [Indexed: 01/09/2023]
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25
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Werle SB, Lindemann D, Steffens D, Demarco FF, de Araujo FB, Pranke P, Casagrande L. Carious deciduous teeth are a potential source for dental pulp stem cells. Clin Oral Investig 2015; 20:75-81. [PMID: 25898896 DOI: 10.1007/s00784-015-1477-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 04/13/2015] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The objectives of this study are to isolate, cultivate, and characterize stem cells from the pulp of carious deciduous teeth (SCCD) and compare them to those retrieved from sound deciduous teeth (SHED--stem cells from human exfoliated deciduous teeth). MATERIAL AND METHODS Cells were obtained of dental pulp collected from sound (n = 10) and carious (n = 10) deciduous human teeth. Rate of isolation, proliferation assay (0, 1, 3, 5, and 7 days), STRO-1, mesenchymal (CD29, CD73, and CD90) and hematopoietic surface marker expression (CD14, CD34, CD45, HLA-DR), and differentiation capacity were evaluated. RESULTS Isolation success rates were 70 and 80 % from the carious and sound groups, respectively. SCCD and SHED presented similar proliferation rate. There were no statistical differences between the groups for the tested surface markers. The cells from sound and carious deciduous teeth were positive for CD29, CD73, and CD90 and negative for CD14, CD34, CD45, and HLA-DR and were capable of differentiating into osteogenic, chondrogenic, and adipogenic lineages. CONCLUSION SCCD demonstrated a similar pattern of proliferation, immunophenotypical characteristics, and differentiation ability as those obtained from sound deciduous teeth. These SCCD represent a feasible source of stem cells. CLINICAL RELEVANCE Decayed deciduous teeth have been usually discarded once the pulp tissue could be damaged and the activity of stem cells compromised. These findings show that stem cells from carious deciduous teeth can be applicable source for cell-based therapies in tissue regeneration.
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Affiliation(s)
- Stefanie Bressan Werle
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Daniele Lindemann
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Daniela Steffens
- Stem Cell Laboratory and Stem Cell Research Institute, School of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Flávio Fernando Demarco
- Department of Operatory Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - Fernando Borba de Araujo
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Patrícia Pranke
- Stem Cell Laboratory and Stem Cell Research Institute, School of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,Head of Hematology and Stem Cell Laboratory and Stem Cell Research Institute, School of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Luciano Casagrande
- Department of Pediatric Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
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26
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Ahn Y, Kim T, Choi H, Bae C, Yang Y, Baek J, Lee J, Cho E. Disruption of Tgfbr2 in Odontoblasts Leads to Aberrant Pulp Calcification. J Dent Res 2015; 94:828-35. [DOI: 10.1177/0022034515577427] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Transforming growth factor β (TGF-β) signaling has been implicated in dentin formation and repair; however, the molecular mechanisms underlying dentin formation remain unclear. To address the role of TGF-β signaling in dentin formation, we analyzed odontoblast-specific Tgfbr2 conditional knockout mice. The mutant mice had aberrant teeth with thin dysplastic dentin and pulpal obliteration, similar to teeth from human patients with dentinogenesis imperfecta type II and dentin dysplasia. In mutant, the odontoblasts lost their cellular polarity, and matrix secretion was disrupted after mantle dentin formation. As a consequence, the amount of predentin decreased significantly, and an ectopic fibrous matrix was formed below the odontoblast layer. This matrix gradually calcified and obliterated the pulp chamber with increasing age. Immunohistochemistry revealed decreased expression of alkaline phosphatase in mutant odontoblasts. In mutant dentin, Dsp expression was reduced, but Dmp1 expression increased significantly. Collagen type I, biglycan, and Dsp were expressed in the ectopic matrix. These results suggest that loss of responsiveness to TGF-β in odontoblasts results in impaired matrix formation and pulpal obliteration. Our study indicates that TGF-β signaling plays an important role in dentin formation and pulp protection. Furthermore, our findings may provide new insight into possible mechanisms underlying human hereditary dentin disorders and reparative dentin formation.
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Affiliation(s)
- Y.H. Ahn
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - T.H. Kim
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - H. Choi
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - C.H. Bae
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - Y.M. Yang
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - J.A. Baek
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - J.C. Lee
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
| | - E.S. Cho
- Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea
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Bakopoulou A, Leyhausen G, Volk J, Papachristou E, Koidis P, Geurtsen W. Wnt/β-catenin signaling regulates Dental Pulp Stem Cells' responses to pulp injury by resinous monomers. Dent Mater 2015; 31:542-55. [PMID: 25735758 DOI: 10.1016/j.dental.2015.02.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Revised: 02/03/2015] [Accepted: 02/09/2015] [Indexed: 01/11/2023]
Abstract
OBJECTIVES Aim of this study was to investigate whether Dental Pulp Stem Cells-DPSCs responses to pulp injury caused by resinous monomers is be mediated through activation of Wnt/β-catenin signaling. METHODS DPSCs cultures were established from third molars of healthy donors and characterized for stem cell markers with flow cytometry. Cells were exposed to TEGDMA (T: 0.5-2mM) with or without presence of the Wnt-1 ligand (W:25-100ng/ml) or the GSK3β inhibitor Lithium (L:1-10mM), used both as activators of Wnt/β-catenin signaling. Cell viability was evaluated by MTT assay, cell cycle profiles by flow cytometry and expression of key molecules of Wnt/β-catenin signaling by Real-time PCR and Western Blot. RESULTS DPSC exposure to TEGDMA caused a concentration-dependent cytotoxicity, accompanied by G1 arrest at lower and G2/M arrest at higher concentrations or after prolonged exposure. Lithium caused a dual effect, by stimulating/inhibiting cell proliferation at lower/higher concentrations respectively and causing a G2/M arrest in a concentration-dependent manner. Wnt signaling could be activated in DPSCs after Lithium or Wnt-1 treatment, as shown by accumulation of β-catenin, its translocation into the nucleus and enhanced expression of key pathway players, like LEF1 and Cyclin D1. Importantly, exposure to TEGDMA caused a more pronounced activation of the pathway, whereas cumulative effects were observed after T/L or T/W co-treatment, indicating a very strong activation of Wnt signaling after treatment of already "activated" (by Lithium or Wnt-1) cells with TEGDMA. SIGNIFICANCE These findings highlight the important role of Wnt canonical signaling in pulp repair responses to common injuries.
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Affiliation(s)
- Athina Bakopoulou
- Department of Fixed Prosthesis & Implant Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece; Department of Conservative Dentistry, Periodontology & Preventive Dentistry, School of Dentistry, Hannover Medical School, Hannover D-30625, Germany
| | - Gabriele Leyhausen
- Department of Conservative Dentistry, Periodontology & Preventive Dentistry, School of Dentistry, Hannover Medical School, Hannover D-30625, Germany
| | - Joachim Volk
- Department of Conservative Dentistry, Periodontology & Preventive Dentistry, School of Dentistry, Hannover Medical School, Hannover D-30625, Germany
| | - Eleni Papachristou
- Department of Fixed Prosthesis & Implant Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
| | - Petros Koidis
- Department of Fixed Prosthesis & Implant Prosthodontics, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
| | - Werner Geurtsen
- Department of Conservative Dentistry, Periodontology & Preventive Dentistry, School of Dentistry, Hannover Medical School, Hannover D-30625, Germany.
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Zhu L, Dissanayaka WL, Green DW, Zhang C. Stimulation of EphB2/ephrin-B1 signalling by tumour necrosis factor alpha in human dental pulp stem cells. Cell Prolif 2015; 48:231-8. [PMID: 25643922 DOI: 10.1111/cpr.12172] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 11/08/2014] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVES The aim of this study was to investigate whether in vitro stimulation of dental pulp stem cells (DPSCs) by tumour necrosis factor alpha (TNF-α) would induce secretion of EphB2/ephrin-B1 signalling. MATERIALS AND METHODS Dental pulp stem cells isolated from human dental pulp were treated with TNF-α (5-100 ng/ml) over 2-48 h. EphB2/ephrin-B1 mRNA and protein levels were measured by real-time polymerase chain reaction (RT-PCR) and western blot analysis respectively. Additionally, DPSCs were pre-incubated with TNF-α receptor neutralizing antibodies or infected with nuclear factor-kappa B (NF-ĸB) inhibitor, p38 MAPK inhibitor, Jun N-terminal kinase (JNK) inhibitor and MEK inhibitor before TNF-α treatment. Results were analysed by one-way ANOVA. RESULTS Tumour necrosis factor alpha increased EphB2 mRNA expression in DPSCs at concentrations up to 20 ng/ml and ephrin-B1 at concentrations up to 40 ng/ml (P < 0.05). Its mRNA expression reached maximum at 24 h when treated with TNF-α at 20 ng/ml (P < 0.05). EphB2/ephrin-B1 protein expression levels were high at 16 and 24 h as shown by western blotting. Neutralizing antibodies for TNFR1/2 receptors down-regulated EphB2/ephrin-B1 mRNA expression (P < 0.05) and ephrin-B1 protein expression, but not EphB2 protein expression. JNK-inhibitor inhibited EphB2 mRNA expression only (P < 0.05). CONCLUSIONS EphB2/ephrin-B1 were invoked in DPSCs with TNF-α treatment via the JNK-dependent pathway, but not NF-ĸB, p38 MAPK or MEK signalling.
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Affiliation(s)
- Lifang Zhu
- Comprehensive Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong, China
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Canonical Wnt signaling acts synergistically on BMP9-induced osteo/odontoblastic differentiation of stem cells of dental apical papilla (SCAPs). Biomaterials 2014; 39:145-54. [PMID: 25468367 DOI: 10.1016/j.biomaterials.2014.11.007] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Revised: 10/21/2014] [Accepted: 11/03/2014] [Indexed: 12/19/2022]
Abstract
Dental pulp/dentin regeneration using dental stem cells combined with odontogenic factors may offer great promise to treat and/or prevent premature tooth loss. Here, we investigate if BMP9 and Wnt/β-catenin act synergistically on odontogenic differentiation. Using the immortalized SCAPs (iSCAPs) isolated from mouse apical papilla tissue, we demonstrate that Wnt3A effectively induces early osteogenic marker alkaline phosphatase (ALP) in iSCAPs, which is reduced by β-catenin knockdown. While Wnt3A and BMP9 enhance each other's ability to induce ALP activity in iSCAPs, silencing β-catenin significantly diminishes BMP9-induced osteo/odontogenic differentiation. Furthermore, silencing β-catenin reduces BMP9-induced expression of osteocalcin and osteopontin and in vitro matrix mineralization of iSCAPs. In vivo stem cell implantation assay reveals that while BMP9-transduced iSCAPs induce robust ectopic bone formation, iSCAPs stimulated with both BMP9 and Wnt3A exhibit more mature and highly mineralized trabecular bone formation. However, knockdown of β-catenin in iSCAPs significantly diminishes BMP9 or BMP9/Wnt3A-induced ectopic bone formation in vivo. Thus, our results strongly suggest that β-catenin may play an important role in BMP9-induced osteo/ondontogenic signaling and that BMP9 and Wnt3A may act synergistically to induce osteo/odontoblastic differentiation of iSCAPs. It's conceivable that BMP9 and/or Wnt3A may be explored as efficacious biofactors for odontogenic regeneration and tooth engineering.
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Wang J, Zhang H, Zhang W, Huang E, Wang N, Wu N, Wen S, Chen X, Liao Z, Deng F, Yin L, Zhang J, Zhang Q, Yan Z, Liu W, Zhang Z, Ye J, Deng Y, Luu HH, Haydon RC, He TC, Deng F. Bone morphogenetic protein-9 effectively induces osteo/odontoblastic differentiation of the reversibly immortalized stem cells of dental apical papilla. Stem Cells Dev 2014; 23:1405-16. [PMID: 24517722 DOI: 10.1089/scd.2013.0580] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Dental pulp/dentin regeneration using dental stem cells combined with odontogenic factors may offer great promise to treat and/or prevent premature tooth loss. We previously demonstrated that bone morphogenetic protein 9 (BMP9) is one of the most potent factors in inducing bone formation. Here, we investigate whether BMP9 can effectively induce odontogenic differentiation of the stem cells from mouse apical papilla (SCAPs). Using a reversible immortalization system expressing SV40 T flanked with Cre/loxP sites, we demonstrate that the SCAPs can be immortalized, resulting in immortalized SCAPs (iSCAPs) that express mesenchymal stem cell markers. BMP9 upregulates Runx2, Sox9, and PPARγ2 and odontoblastic markers, and induces alkaline phosphatase activity and matrix mineralization in the iSCAPs. Cre-mediated removal of SV40 T antigen decreases iSCAP proliferation. The in vivo stem cell implantation studies indicate that iSCAPs can differentiate into bone, cartilage, and, to lesser extent, adipocytes upon BMP9 stimulation. Our results demonstrate that the conditionally iSCAPs not only maintain long-term cell proliferation but also retain the ability to differentiate into multiple lineages, including osteo/odontoblastic differentiation. Thus, the reversibly iSCAPs may serve as an important tool to study SCAP biology and SCAP translational use in tooth engineering. Further, BMP9 may be explored as a novel and efficacious factor for odontogenic regeneration.
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Affiliation(s)
- Jinhua Wang
- 1 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, and The Affiliated Hospital of Stomatology of Chongqing Medical University , Chongqing, China
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Gopinathan G, Kolokythas A, Luan X, Diekwisch TGH. Epigenetic marks define the lineage and differentiation potential of two distinct neural crest-derived intermediate odontogenic progenitor populations. Stem Cells Dev 2013; 22:1763-78. [PMID: 23379639 DOI: 10.1089/scd.2012.0711] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Epigenetic mechanisms, such as histone modifications, play an active role in the differentiation and lineage commitment of mesenchymal stem cells. In the present study, epigenetic states and differentiation profiles of two odontogenic neural crest-derived intermediate progenitor populations were compared: dental pulp (DP) and dental follicle (DF). ChIP on chip assays revealed substantial H3K27me3-mediated repression of odontoblast lineage genes DSPP and dentin matrix protein 1 (DMP1) in DF cells, but not in DP cells. Mineralization inductive conditions caused steep increases of mineralization and patterning gene expression levels in DP cells when compared to DF cells. In contrast, mineralization induction resulted in a highly dynamic histone modification response in DF cells, while there was only a subdued effect in DP cells. Both DF and DP progenitors featured H3K4me3-active marks on the promoters of early mineralization genes RUNX2, MSX2, and DLX5, while OSX, IBSP, and BGLAP promoters were enriched for H3K9me3 or H3K27me3. Compared to DF cells, DP cells expressed higher levels of three pluripotency-associated genes, OCT4, NANOG, and SOX2. Finally, gene ontology comparison of bivalent marks unique for DP and DF cells highlighted cell-cell attachment genes in DP cells and neurogenesis genes in DF cells. In conclusion, the present study indicates that the DF intermediate odontogenic neural crest lineage is distinguished from its DP counterpart by epigenetic repression of DSPP and DMP1 genes and through dynamic histone enrichment responses to mineralization induction. Findings presented here highlight the crucial role of epigenetic regulatory mechanisms in the terminal differentiation of odontogenic neural crest lineages.
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Affiliation(s)
- Gokul Gopinathan
- UIC Brodie Laboratory for Craniofacial Genetics, UIC College of Dentistry, Chicago, Illinois 60612, USA
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Goodis HE, Kinaia BM, Kinaia AM, Chogle SMA. Regenerative endodontics and tissue engineering: what the future holds? Dent Clin North Am 2012; 56:677-89. [PMID: 22835545 DOI: 10.1016/j.cden.2012.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The work performed by researchers in regenerative endodontics and tissue engineering over the last decades has been superb; however, many questions remain to be answered. The basic biologic mechanisms must be elucidated that will allow the development of dental pulp and dentin in situ. Stress must be placed on the many questions that will lead to the design of effective, safe treatment options and therapies. This article discusses those questions, the answers to which may become the future of regenerative endodontics. The future remains bright, but proper support and patience are required.
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Affiliation(s)
- Harold E Goodis
- The Boston University Institute for Dental Research and Education, PO Box 505097, Dubai Healthcare City, Dubai, United Arab Emirates.
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Ilić J, Radović K, Roganović J, Brković B, Stojić D. The Levels of Vascular Endothelial Growth Factor and Bone Morphogenetic Protein 2 in Dental Pulp Tissue of Healthy and Diabetic Patients. J Endod 2012; 38:764-8. [DOI: 10.1016/j.joen.2012.03.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 03/12/2012] [Accepted: 03/13/2012] [Indexed: 01/09/2023]
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34
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Bakopoulou A, Leyhausen G, Volk J, Koidis P, Geurtsen W. Effects of resinous monomers on the odontogenic differentiation and mineralization potential of highly proliferative and clonogenic cultured apical papilla stem cells. Dent Mater 2012; 28:327-39. [DOI: 10.1016/j.dental.2012.01.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 12/01/2011] [Accepted: 01/04/2012] [Indexed: 01/09/2023]
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35
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