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Di T, Chen Y, Zhou Z, Liu J, Du Y, Feng C, Zhu B, Wang L. Effect of α7 nAChR-autophagy axis of deciduous tooth pulp stem cells in regulating IL-1β in the process of physiological root resorption of deciduous teeth. J Mol Med (Berl) 2024; 102:1135-1149. [PMID: 39002004 DOI: 10.1007/s00109-024-02466-0] [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: 12/31/2023] [Revised: 05/27/2024] [Accepted: 06/24/2024] [Indexed: 07/15/2024]
Abstract
Physiological root resorption of deciduous teeth is a normal phenomenon occurring during the developmental stages of children. Previous research has indicated the pivotal role of the inflammatory microenvironment in this process, although the specific mechanisms remain unclear. This study is aimed at elucidating the involvement of the alpha7 nicotinic acetylcholine receptors (α7 nAChR)-autophagy axis in the regulation of the inflammatory microenvironment during physiological root resorption in deciduous teeth. Samples were collected from deciduous teeth at various stages of physiological root resorption, and deciduous dental pulp stem cells (DDPSCs) were isolated and cultured during the mid-phase of root resorption. The findings revealed a substantial infiltration of the pulp of deciduous teeth at the mid-phase of root resorption, characterized by elevated expression levels of α7 nAChR and IL-1β. Significantly increased IL-1β and α7 nAChR expressions were observed in DDPSCs during the mid-phase of root resorption, with α7 nAChR demonstrating a regulatory effect on IL-1β. Moreover, evidence suggested that mechanical stress may act as a trigger, regulating autophagy and IL-1 expression via α7 nAChR. In conclusion, mechanical stress was identified as a regulator of autophagy in DDPSCs through α7 nAChR, influencing the expression of IL-1β and contributing to the formation of the inflammatory microenvironment. This mechanism plays a crucial role in the physiological root resorption of deciduous teeth. KEY MESSAGES: The pulp of deciduous teeth at mid-phase of root resorption was heavily infiltrated with high expression of α7nAChR and IL-1β. α7 nAChR acts as an initiating factor to regulate IL-1β through autophagy in DDPSCs. Mechanical stress can regulate autophagy of DDPSCs through α7 nAChR and thus affect IL-1β expression and inflammatory microenvironment formation in physiological root resorption in deciduous teeth.
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Affiliation(s)
- Tiankai Di
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China
- Department of Stomatology, The 969th Hospital, Joint Logistics Support Force of the Chinese People's Liberation Army, Hohhot, Inner Mongolia, 010000, People's Republic of China
| | - Yujiang Chen
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China
- Department of Neurobiology and Institute of Neurosciences, School of Basic Medicine, Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China
| | - Zhifei Zhou
- Department of Stomatology, General Hospital of Tibet Military Region, Lhasa, 850007, People's Republic of China
| | - Jiajia Liu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China
| | - Yang Du
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China
| | - Chao Feng
- Department of Stomatology, The 969th Hospital, Joint Logistics Support Force of the Chinese People's Liberation Army, Hohhot, Inner Mongolia, 010000, People's Republic of China
- Center for Computational Biology, Institute of Military Cognition and Brain Sciences, Academy of Military Medical Sciences, Beijing, 100850, People's Republic of China
| | - Bin Zhu
- Department of Stomatology, General Hospital of Tibet Military Region, Lhasa, 850007, People's Republic of China.
| | - Lulu Wang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, People's Republic of China.
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Di T, Guo M, Xu J, Feng C, Du Y, Wang L, Chen Y. Circadian clock genes REV-ERBα regulates the secretion of IL-1β in deciduous tooth pulp stem cells by regulating autophagy in the process of physiological root resorption of deciduous teeth. Dev Biol 2024; 510:8-16. [PMID: 38403101 DOI: 10.1016/j.ydbio.2024.02.008] [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: 06/28/2023] [Revised: 01/15/2024] [Accepted: 02/19/2024] [Indexed: 02/27/2024]
Abstract
Physiological root resorption is a common occurrence during the development of deciduous teeth in children. Previous research has shown that the regulation of the inflammatory microenvironment through autophagy in DDPSCs is a significant factor in this process. However, it remains unclear why there are variations in the autophagic status of DDPSCs at different stages of physiological root resorption. To address this gap in knowledge, this study examines the relationship between the circadian clock of DDPSCs, the autophagic status, and the periodicity of masticatory behavior. Samples were collected from deciduous teeth at various stages of physiological root resorption, and DDPSCs were isolated and cultured for analysis. The results indicate that the circadian rhythm of important autophagy genes, such as Beclin-1 and LC3, and the clock gene REV-ERBα in DDPSCs, disappears under mechanical stress. Additionally, the study found that REV-ERBα can regulate Beclin-1 and LC3. Evidence suggests that mechanical stress is a trigger for the regulation of autophagy via REV-ERBα. Overall, this study highlights the importance of mechanical stress in regulating autophagy of DDPSCs via REV-ERBα, which affects the formation of the inflammatory microenvironment and plays a critical role in physiological root resorption in deciduous teeth.
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Affiliation(s)
- Tiankai Di
- State Key Laboratory of Military Stomatology &National Clinical Research Center for Oral Diseases&Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, China; Department of Stomatology, The 969th Hospital, Joint Logistics Support Force of the Chinese People's Liberation Army, Hohhot, Inner Mongolia, 010000, China
| | - Mingzhu Guo
- Qingdao Stomatological Hospital Affiliated to Qingdao University, Qingdao, Shandong Province, 266001, China
| | - Jinlong Xu
- The 969th Hospital, Joint Logistics Support Force of the Chinese People's Liberation Army, Hohhot, Inner Mongolia, 010000, China
| | - Chao Feng
- Center for Computational Biology, Institute of Military Cognition and Brain Sciences, Academy of Military Medical Sciences, Beijing, 100850, China; Department of Clinical Laboratory, The 969th Hospital, Joint Logistics Support Force of the Chinese People's Liberation Army, Hohhot, Inner Mongolia, 010000, China
| | - Yang Du
- State Key Laboratory of Military Stomatology &National Clinical Research Center for Oral Diseases&Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Lulu Wang
- State Key Laboratory of Military Stomatology &National Clinical Research Center for Oral Diseases&Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
| | - Yujiang Chen
- State Key Laboratory of Military Stomatology &National Clinical Research Center for Oral Diseases&Shaanxi Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi'an, Shaanxi, 710032, China; Department of Neurobiology and Institute of Neurosciences, School of Basic Medicine, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
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Ishizuka K, Kato C, Fujita A, Misawa-Omori E, Ono T. Factors influencing root resorption in retained mandibular second deciduous molars with congenital absence of second premolars: a cross-sectional study. Prog Orthod 2024; 25:14. [PMID: 38556605 PMCID: PMC10982280 DOI: 10.1186/s40510-024-00512-8] [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: 11/06/2023] [Accepted: 01/30/2024] [Indexed: 04/02/2024] Open
Abstract
BACKGROUND There are currently no studies that quantitatively compare the relationship of root resorption to the patient's systemic history or craniofacial and intraoral morphology, especially in relation to possible host factors. Thus, this study aimed to clarify the factors associated with root resorption in retained mandibular second deciduous molars with the congenital absence of second premolars and predict the prognosis of retained mandibular second deciduous molars. METHODS A cohort of 5547 patients who visited the orthodontic clinic at Tokyo Medical and Dental University Dental Hospital between 2013 and 2022 was screened. Lateral cephalometric radiographs, panoramic radiographs, upper and lower dental models, and orthodontic treatment questionnaires were used as reference materials to apply the inclusion and exclusion criteria. Ultimately, 111 patients were included in the analyses. The patients were divided into two groups based on the root resorption levels of the retained mandibular second deciduous molars. Those with less root resorption were classified under the good condition (GC) group, whereas those with more root resorption were classified under the poor condition (PC) group. Demographic, clinical, and cephalometric parameters were compared between the groups. A multivariate logistic regression model was used to predict the probability of root resorption. RESULTS The prevalence of congenitally missing mandibular second premolars with persistent mandibular second deciduous molars was 2.0%. In a total of 111 patients, eighty-three teeth (53.2%) were classified into the GC group, whereas 73 teeth (46.8%) were classified into the PC group. The Frankfort-mandibular plane angle (FMA) [odds ratio (OR): 0.87], Frankfort-mandibular incisor angle (FMIA) (OR: 0.93), overbite (OR: 1.38), adjacent interdental space (OR: 1.46), distance from occlusal plane (OR: 0.80), and caries treatment (OR: 7.05) were significantly associated with the root resorption of the retained mandibular second deciduous molars. CONCLUSIONS Our findings suggest that skeletal morphology, oral morphological patterns, and history contribute to root resorption in retained mandibular second deciduous teeth with congenital absence of subsequent permanent teeth.
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Affiliation(s)
- Keita Ishizuka
- Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Chiho Kato
- Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima Bunkyo-ku, Tokyo, 113-8510, Japan.
| | - Akiyo Fujita
- Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Eri Misawa-Omori
- Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima Bunkyo-ku, Tokyo, 113-8510, Japan
| | - Takashi Ono
- Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima Bunkyo-ku, Tokyo, 113-8510, Japan
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Gadallah LK, Elbardissy A, Elyazeed MA, Alsamad AA, Hamdy M. Pulpotomy versus pulpectomy in carious vital pulp exposure in primary incisors: a randomized controlled trial. BMC Oral Health 2024; 24:354. [PMID: 38504243 PMCID: PMC10953279 DOI: 10.1186/s12903-024-04116-w] [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: 09/10/2023] [Accepted: 03/06/2024] [Indexed: 03/21/2024] Open
Abstract
BACKGROUND Pulpotomy as a minimally invasive pulp therapy technique is the treatment of choice for carious pulp exposures, however many pediatric dentists perform pulpectomies in vital primary incisors. The aim of this split mouth randomized controlled study was to compare formocresol pulpotomy and zinc-oxide and eugenol pulpectomy in the treatment of vital pulp exposure in primary incisors. METHODS Contralateral pairs of incisors were randomly assigned to receive pulpotomy or pulpectomy in children aging from 18 to 66 months old and were followed up for 12 months. RESULTS 39 pairs of incisors were included. Clinical and radiographical success rates showed no statistical significant difference (p = 1, p = 0.8 respectively). Relative risk measures for clinical success rates (RR = 1.03, 95%CI 0.87 to 1.23) and for radiographic success rates (RR = 1.03, 95%CI 0.83 to 1.29) with CIs including number one showing no difference between the two groups. The Survival rate using Kaplan-Meier survival analysis score showed 82% for pulpotomy and 74% for pulpectomy at 12 months (P = 0.2). CONCLUSIONS Both pulpotomy and pulpectomy techniques can be used successfully in the treatment of carious vital pulp exposure in primary incisors. TRIAL REGISTRATION The trial was retrospectively registered in Clinicaltrials .gov with this identifier NCT05589025 on 21/10/2022.
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Affiliation(s)
- Lamia Khairy Gadallah
- Researcher of Pediatric Dentistry, Orthodontics and Pediatric Dentistry Department, National Research Centre, Elbuhouth st, Dokki, Cairo, 12622, Egypt.
| | - Adel Elbardissy
- Pediatric Dentistry and Dental Public Health, Faculty of Dentistry, Cairo University, Dokki, Egypt
| | - Mohamed Abo Elyazeed
- Orthodontics and Pediatric Dentistry Department, National Research Centre, Dokki, Egypt
| | - Ahmad Abd Alsamad
- Oral and Maxillofacial Radiology, Faculty of Dentistry, Cairo University, Dokki, Egypt
| | - Mahmoud Hamdy
- Pediatric Dentistry and Dental Public Health Department, Faculty of Dentistry, Cairo University, Dokki, Egypt
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Peters SB, Emrick JJ. Nociceptors are needed to guide tooth development, function, repair, and regeneration. Neural Regen Res 2023; 18:1503-1504. [PMID: 36571354 PMCID: PMC10075122 DOI: 10.4103/1673-5374.360280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/14/2022] [Accepted: 10/20/2022] [Indexed: 11/19/2022] Open
Affiliation(s)
- Sarah B. Peters
- Division of Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Joshua J. Emrick
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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