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Fan DY, Zhai HY, Zhao Y, Qiao X, Zhu DC, Liu HJ, Liu C. The role of cannabinoid receptor 2 in bone remodeling during orthodontic tooth movement. BMC Oral Health 2024; 24:23. [PMID: 38178129 PMCID: PMC10768142 DOI: 10.1186/s12903-023-03810-5] [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: 07/29/2023] [Accepted: 12/19/2023] [Indexed: 01/06/2024] Open
Abstract
BACKGROUND The purpose of this study is to explore the effects of CB2 on bone regulation during orthodontic tooth movement. METHODS Thirty male mice were allocated into 2 groups (n = 15 in each group): wild type (WT) group and CB2 knockout (CB2-/-) group. Orthodontic tooth movement (OTM) was induced by applying a nickel-titanium coil spring between the maxillary first molar and the central incisors. There are three subgroups within the WT groups (0, 7 and 14 days) and the CB2-/- groups (0, 7 and 14 days). 0-day groups without force application. Tooth displacement, alveolar bone mass and alveolar bone volume were assessed by micro-CT on 0, 7 and 14 days, and the number of osteoclasts was quantified by tartrate-resistant acid phosphatase (TRAP) staining. Moreover, the expression levels of RANKL and OPG in the compression area were measured histomorphometrically. RESULTS The WT group exhibited the typical pattern of OTM, characterized by narrowed periodontal space and bone resorption on the compression area. In contrast, the accelerated tooth displacement, increased osteoclast number (P < 0.0001) and bone resorption on the compression area in CB2-/- group. Additionally, the expression of RANKL was significantly upregulated, while OPG showed low levels in the compression area of the CB2 - / - group (P < 0.0001). CONCLUSIONS CB2 modulated OTM and bone remodeling through regulating osteoclast activity and RANKL/OPG balance.
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Affiliation(s)
- Deng-Ying Fan
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Hao-Yan Zhai
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Yuan Zhao
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Xing Qiao
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - De-Chao Zhu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Hui-Juan Liu
- The Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology, Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China.
| | - Chunyan Liu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China.
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Jiao Y, Mi S, Li X, Liu Y, Han N, Xu J, Liu Y, Li S, Guo L. MicroRNA-155 targets SOCS1 to inhibit osteoclast differentiation during orthodontic tooth movement. BMC Oral Health 2023; 23:955. [PMID: 38041017 PMCID: PMC10693016 DOI: 10.1186/s12903-023-03443-8] [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: 05/19/2023] [Accepted: 09/21/2023] [Indexed: 12/03/2023] Open
Abstract
BACKGROUND MicroRNA-155 (miR-155) is a multifunctional miRNA whose expression is known to be involved in a range of physiological and pathological processes. Its association with several oral diseases has been established. However, the specific role of miR-155 in orthodontic tooth movement remains unclear. In this study, we investigated the impact of miR-155 on osteoclast differentiation and orthodontic tooth movement models, aiming to explore the underlying mechanisms. METHODS In this experiment, we utilized various agents including miR-155 mimic, miR-155 inhibitor, as well as non-specific sequences (NC mimic & NC inhibitor) to treat murine BMMNCs. Subsequently, osteoclast induction (OC) was carried out to examine the changes in the differentiation ability of monocytes under different conditions. To assess these changes, we employed RT-PCR, Western blotting, and TRAP staining techniques. For the orthodontic tooth movement model in mice, the subjects were divided into two groups: the NaCl group (injected with saline solution) and the miR-155 inhibitor group (injected with AntagomiR-155). We observed the impact of orthodontic tooth movement using stereoscopic microscopy, micro-CT, and HE staining. Furthermore, we performed RT-PCR and Western blotting analyses on the tissues surrounding the moving teeth. Additionally, we employed TargetScan to predict potential target genes of miR-155. RESULTS During osteoclast induction of BMMNCs, the expression of miR-155 exhibited an inverse correlation with osteoclast-related markers. Overexpression of miR-155 led to a decrease in osteoclast-related indexes, whereas underexpression of miR-155 increased those indexes. In the mouse orthodontic tooth movement model, the rate of tooth movement was enhanced following injection of the miR-155 inhibitor, leading to heightened osteoclast activity. TargetScan analysis identified SOCS1 as a target gene of miR-155. CONCLUSIONS Our results suggest that miR-155 functions as an inhibitor of osteoclast differentiation, and it appears to regulate osteoclasts during orthodontic tooth movement. The regulatory mechanism of miR-155 in this process involves the targeting of SOCS1.
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Affiliation(s)
- Yao Jiao
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
| | - Sicong Mi
- Department of Stomatology, Air Force Medical Center, PLA, The Fourth Military Medical University, Beijing, 100142, P. R. China
| | - Xiaoyan Li
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
- Laboratory of Tissue Regeneration and Immunology, Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, 100050, P. R. China
| | - Yitong Liu
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
- Laboratory of Tissue Regeneration and Immunology, Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, 100050, P. R. China
| | - Nannan Han
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
- Laboratory of Tissue Regeneration and Immunology, Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, 100050, P. R. China
| | - Junji Xu
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
- Laboratory of Tissue Regeneration and Immunology, Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, 100050, P. R. China
| | - Yi Liu
- Department of Periodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China
- Laboratory of Tissue Regeneration and Immunology, Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, 100050, P. R. China
| | - Song Li
- Department of Orthodontics, School of Stomatology, Capital Medical University, Tian Tan Xi Li No.4, Beijing, 100050, P. R. China.
| | - Lijia Guo
- Department of Orthodontics (WangFuJing Campus), School of Stomatology, Capital Medical University, Scylla alley No.11, Beijing, 100006, P. R. China.
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Lin Y, Fu ML, Harb I, Ma LX, Tran SD. Functional Biomaterials for Local Control of Orthodontic Tooth Movement. J Funct Biomater 2023; 14:294. [PMID: 37367258 DOI: 10.3390/jfb14060294] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/08/2023] [Accepted: 05/21/2023] [Indexed: 06/28/2023] Open
Abstract
Orthodontic tooth movement (OTM) occurs with the application of a controlled mechanical force and results in coordinated tissue resorption and formation in the surrounding bone and periodontal ligament. The turnover processes of the periodontal and bone tissue are associated with specific signaling factors, such as Receptor Activator of Nuclear factor Kappa-β Ligand (RANKL), osteoprotegerin, runt-related transcription factor 2 (RUNX2), etc., which can be regulated by different biomaterials, promoting or inhibiting bone remodeling during OTM. Different bone substitutes or bone regeneration materials have also been applied to repair alveolar bone defects followed by orthodontic treatment. Those bioengineered bone graft materials also change the local environment that may or may not affect OTM. This article aims to review functional biomaterials that were applied locally to accelerate OTM for a shorter duration of orthodontic treatment or impede OTM for retention purposes, as well as various alveolar bone graft materials which may affect OTM. This review article summarizes various types of biomaterials that can be locally applied to affect the process of OTM, along with their potential mechanisms of action and side effects. The functionalization of biomaterials can improve the solubility or intake of biomolecules, leading to better outcomes in terms of increasing or decreasing the speed of OTM. The ideal timing for initiating OTM is generally considered to be 8 weeks post-grafting. However, more evidence is needed from human studies to fully understand the effects of these biomaterials, including any potential adverse effects.
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Affiliation(s)
- Yi Lin
- Division of Orthodontics, Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, CA 94143, USA
| | - Moyu Lara Fu
- School of Dentistry, University of California San Francisco, San Francisco, CA 94143, USA
| | - Ingrid Harb
- Division of Dentistry, Montreal Children's Hospital and Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, QC H3A 1G1, Canada
| | - Lisa Xiaolu Ma
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, QC H3A 1G1, Canada
| | - Simon D Tran
- Craniofacial Tissue Engineering and Stem Cells Laboratory, Faculty of Dental Medicine and Oral Health Science, McGill University, Montreal, QC H3A 1G1, Canada
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Chauhan N, Kumar M, Chaurasia S, Garg Y, Chopra S, Bhatia A. A Comprehensive Review on Drug Therapies and Nanomaterials used in Orthodontic Treatment. Curr Pharm Des 2023; 29:3154-3165. [PMID: 38018198 DOI: 10.2174/0113816128276153231117054242] [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: 08/07/2023] [Revised: 09/28/2023] [Accepted: 10/20/2023] [Indexed: 11/30/2023]
Abstract
Orthodontic treatment typically requires an extended duration of 1-2 years to complete the treatment. Accelerating the rate of tooth movement during orthodontic treatment is essential for shortening the overall treatment duration. After the completion of orthodontic treatment, a prominent concern arises in the form of orthodontic relapse, where the teeth tend to revert to their original positions. This issue affects approximately 60% of the global population, underscoring the importance of implementing effective measures to address orthodontic relapse. An approach in this regard involves the targeted administration of herbal and synthetic drugs applied directly to the specific area of interest to facilitate tooth movement and prevent orthodontic relapse. Apart from this, researchers are investigating the feasibility of utilizing different types of nanoparticles to improve the process of orthodontic tooth movement. In recent years, there has been a noticeable increase in the number of studies examining the effects of various drugs on orthodontics. However, the currently available literature does not provide significant evidence relating to orthodontic tooth movement. In this review, the authors provide valuable information about the drugs and nanomaterials that are capable of further enhancing the rate of orthodontic tooth movement and reducing the risk of orthodontic relapse. However, a notable hurdle remains, i.e., there is no marketed formulation available that can enhance orthodontic tooth movement and reduce treatment time. Therefore, researchers should try herbal-synthetic approaches to achieve a synergistic effect that can enhance orthodontic tooth movement. In this nutshell, there is an urgent need to develop a non-invasive, patient-compliant, and cost-effective formulation that will provide quality treatment and ultimately reduce the treatment time. Another critical issue is orthodontic relapse, which can be addressed by employing drugs that slow down osteoclastogenesis, thereby preventing tooth movement after treatment. Nevertheless, extensive research is still required to overcome this challenge in the future.
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Affiliation(s)
- Nitasha Chauhan
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
| | - Mohit Kumar
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
| | - Simran Chaurasia
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
| | - Yogesh Garg
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
| | - Shruti Chopra
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
| | - Amit Bhatia
- Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University (MRSPTU), Bathinda 151001, Punjab, India
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Liu Z, Lu J, Chen X, Xiu P, Zhang Y, Lv X, Jiang X, Wang K, Zhang L. A novel amelogenesis-inspired hydrogel composite for the remineralization of enamel non-cavitated lesions. J Mater Chem B 2022; 10:10150-10161. [PMID: 36472307 DOI: 10.1039/d2tb01711c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Enamel non-cavitated lesions (NCLs) are subsurface enamel porosity from carious demineralization. The developed enamel cannot repair itself once NCLs occurs. The regeneration of mineral crystals in a biomimetic environment is an effective way to repair enamel subsurface defects. Previously, an amelogenin-derived peptide named QP5 was proven to repair demineralized enamel. In this work, inspired by amelogenesis, a novel biomimetic hydrogel composite containing the QP5 peptide and bioactive glass (BG) was designed, in which QP5 could promote enamel remineralization by guiding the calcium and phosphorus ions provided by BG. Also, BG could adjust the mineralization micro-environment to alkalinity, simulating the pH regulation of ameloblasts during enamel maturity. The BQ hydrogel composite showed biosafety and possessed capacity for enamel binding, ion release and pH buffering. Enamel NCLs treated with the BQ hydrogel composite showed a higher reduction in lesion depth and mineral loss both in vitro and in vivo. Moreover, compared to the hydrogels containing only BG or QP5, groups treated with the BQ hydrogel composite attained more surface microhardness recovery and color recovery, exhibiting resistance to erosion and abrasion of the remineralization layer. We envision that the BQ hydrogel composite can provide a biomimetic micro-environment to favor enamel remineralization, thus reducing the lesion depth and increasing the mineral content as a promising biomimetic material for enamel NCLs.
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Affiliation(s)
- Zhenqi Liu
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Junzhuo Lu
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Xiangshu Chen
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Peng Xiu
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Yinmo Zhang
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Xiaohui Lv
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Xinyi Jiang
- Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Kun Wang
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
| | - Linglin Zhang
- State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China. .,Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, No.14, Section 3, Renmin Road South, Chengdu, China
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Use of Hydrogels to Regulate Orthodontic Tooth Movement in Animal Models: A Systematic Review. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12136683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
The objective of this article is to conduct a systematic review of the literature to contrast the existing evidence regarding the use of hydrogels during and after experimental orthodontic treatment in animals. An extensive search was performed through the electronic databases, Medline, Web of Science and Scopus, from December 2020 to April 2021 for in vivo animal studies. A total of 282 studies were reviewed. Eight studies were included for final revision; four studies were conducted in rats, two in rabbits, one study in mice and one study in guinea pigs. The quality assessment of the eight included studies was performed according to the ARRIVE guidelines and the risk of bias was assessed using the Center for Systematic Review of Laboratory Animal Experimentation tool; in four of the eight articles evaluated, a high risk-of-bias rating was obtained in 40% of the criteria evaluated. In the studies reviewed, the hydrogel acted as a carrier, and inhibition (post-treatment retention) or acceleration of orthodontic tooth movement was assessed according to the active substance used in each of the articles. The uses of hydrogels for transporting active substances to regulate the rate of orthodontic tooth movement remains debatable. Future studies are suggested to evaluate the feasibility of hydrogel as a transport method in humans.
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Effects of local vs systemic administration of CXCR4 inhibitor AMD3100 on orthodontic tooth movement in rats. Am J Orthod Dentofacial Orthop 2022; 162:182-192. [DOI: 10.1016/j.ajodo.2021.03.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 03/01/2021] [Accepted: 03/01/2021] [Indexed: 12/16/2022]
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Vitamin E enriched diet increases the rate of orthodontic tooth movement. Am J Orthod Dentofacial Orthop 2022; 161:687-697.e3. [PMID: 35012806 DOI: 10.1016/j.ajodo.2020.10.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 10/01/2020] [Accepted: 10/01/2020] [Indexed: 11/23/2022]
Abstract
INTRODUCTION Vitamin E is a popular antioxidant suggested to affect bone turnover. However, the effects of a vitamin E enriched diet on the rate of tooth movement are unknown. Therefore, this study aimed to evaluate tooth movement in rats receiving a vitamin E enriched diet. In addition, we examined bone remodeling in experimental and control rats. METHODS Thirty-two 6-week-old male rats were divided into 4 groups: (1) group 1 (n = 8): orthodontic tooth movement (OTM) for 4 days + regular diet; (2) group 2 (n = 8): OTM for 14 days + regular diet; (3) group 3 (n = 8): OTM for 4 days + vitamin E diet; and (4) group 4 (n = 8) - OTM for 14 days + vitamin E diet. Maxillary alveolar bones and femurs of rats were analyzed by microcomputed tomography and histology. RESULTS Rats fed a vitamin E diet presented an increased OTM rate at days 4 and 14. We found an increased number of osteoclasts and decreased bone volume in the vitamin E diet group at day 14 of OTM. In addition, there was increased expression of the microphthalmia-associated transcription factor in the alveolar bone of the vitamin E diet group. In contrast, there was no difference in bone remodeling in femurs or alveolar bone at the control side. CONCLUSIONS We found that an enriched vitamin E diet increases the rate of OTM in rats, suggesting that vitamin E may be useful as an avenue to accelerate OTM.
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The effect of genetic polymorphisms on treatment duration following premolar extraction. Sci Rep 2021; 11:15942. [PMID: 34354108 PMCID: PMC8342496 DOI: 10.1038/s41598-021-94979-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 06/30/2021] [Indexed: 02/07/2023] Open
Abstract
To elucidate genetic factors affecting orthodontic treatment duration, we employed targeted next-generation sequencing on DNA from the saliva of 117 patients undergoing orthodontic treatment after premolar extraction. The clinical characteristics of patients are summarized, and the association of clinical variables with treatment duration was assessed. Patients whose treatment duration deviated from the average were classified into an extreme long group or an extreme short group. We identified nine single nucleotide polymorphisms (SNPs) of six genes that significantly differed in the two groups via targeted sequencing. The frequency of the CC genotypes of WNT3A, SPP1 (rs4754, rs9138), and TNFSF11, TT genotype of SPP1 (rs1126616), and GG genotype of SFRP2 was significantly higher in the extreme long group than in the short group. In the extreme short group, the TC genotype of SPP1, AA genotype of P2RX7, CT genotype of TNFSF11, and AG genotype of TNFRSF11A tended to exhibit higher frequency than in the long group. Taken together, we identified genetic polymorphisms related to treatment duration in Korean orthodontic patients undergoing premolar extraction. Our findings could lead to further studies predicting the prolongation of the orthodontic treatment duration, and will be of great aid to patients as well as orthodontists.
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Kaplan M, Kalajzic Z, Choi T, Maleeh I, Ricupero CL, Skelton MN, Daily ML, Chen J, Wadhwa S. The role of inhibition of osteocyte apoptosis in mediating orthodontic tooth movement and periodontal remodeling: a pilot study. Prog Orthod 2021; 22:21. [PMID: 34308514 PMCID: PMC8310814 DOI: 10.1186/s40510-021-00366-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 06/07/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Orthodontic tooth movement (OTM) has been shown to induce osteocyte apoptosis in alveolar bone shortly after force application. However, how osteocyte apoptosis affects orthodontic tooth movement is unknown. The goal of this study was to assess the effect of inhibition of osteocyte apoptosis on osteoclastogenesis, changes in the alveolar bone density, and the magnitude of OTM using a bisphosphonate analog (IG9402), a drug that affects osteocyte and osteoblast apoptosis but does not affect osteoclasts. MATERIAL AND METHODS Two sets of experiments were performed. Experiment 1 was used to specifically evaluate the effect of IG9402 on osteocyte apoptosis in the alveolar bone during 24 h of OTM. For this experiment, twelve mice were divided into two groups: group 1, saline administration + OTM24-h (n=6), and group 2, IG9402 administration + OTM24-h (n=6). The contralateral unloaded sides served as the control. The goal of experiment 2 was to evaluate the role of osteocyte apoptosis on OTM magnitude and osteoclastogenesis 10 days after OTM. Twenty mice were divided into 4 groups: group 1, saline administration without OTM (n=5); group 2, IG9402 administration without OTM (n=5); group 3, saline + OTM10-day (n=6); and group 4, IG9402 + OTM10-day (n=4). For both experiments, tooth movement was achieved using Ultra Light (25g) Sentalloy Closed Coil Springs attached between the first maxillary molar and the central incisor. Linear measurements of tooth movement and alveolar bone density (BVF) were assessed by MicroCT analysis. Cell death (or apoptosis) was assessed by terminal dUTP nick-end labeling (TUNEL) assay, while osteoclast and macrophage formation were assessed by tartrate-resistant acid phosphatase (TRAP) staining and F4/80+ immunostaining. RESULTS We found that IG9402 significantly blocked osteocyte apoptosis in alveolar bone (AB) at 24 h of OTM. At 10 days, IG9402 prevented OTM-induced loss of alveolar bone density and changed the morphology and quality of osteoclasts and macrophages, but did not significantly affect the amount of tooth movement. CONCLUSION Our study demonstrates that osteocyte apoptosis may play a significant role in osteoclast and macrophage formation during OTM, but does not seem to play a role in the magnitude of orthodontic tooth movement.
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Affiliation(s)
- Michele Kaplan
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA.
| | - Zana Kalajzic
- Department of Oral Health and Diagnostic Sciences, Division of Oral Medicine, UConn Health, Farmington, CT, USA
| | - Thomas Choi
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Imad Maleeh
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Christopher L Ricupero
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Michelle N Skelton
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Madeleine L Daily
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Jing Chen
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Sunil Wadhwa
- Division of Orthodontics, College of Dental Medicine, Columbia University, New York, NY, USA
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Chaushu S, Klein Y, Mandelboim O, Barenholz Y, Fleissig O. Immune Changes Induced by Orthodontic Forces: A Critical Review. J Dent Res 2021; 101:11-20. [PMID: 34105404 DOI: 10.1177/00220345211016285] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Orthodontic tooth movement (OTM) is generated by a mechanical force that induces an aseptic inflammatory response in the periodontal tissues and a subsequent coordinated process of bone resorption and apposition. In this review, we critically summarize the current knowledge on the immune processes involved in OTM inflammation and provide a novel insight into the relationship between classical inflammation and clinical OTM phases. We found that most studies focused on the acute inflammatory process, which ignites the initial alveolar bone resorption. However, the exact mechanisms and the immune reactions involved in the following OTM phases remain obscure. Recent studies highlight the existence of a typical innate response of resident and extravasated immune cells, including granulocytes and natural killer (NK), dendritic, and γδT cells. Based on few available studies, we shed light on an active, albeit incomplete, process of resolution in the lag phase, supported by continuously elevated ratios of M1/M2 macrophage and receptor activator of nuclear factor κB ligand/osteoprotegerin ratio. This partial resolution enables tissue formation and creates the appropriate environment for a transition between the innate and adaptive arms of the immune system, essential for the tissue's return to homeostasis. Nevertheless, as the mechanical trigger persists, the resolution turns into a low-grade chronic inflammation, which underlies the next, acceleration/linear OTM phase. In this stage, the acute inflammation dampens, and a simultaneous process of bone resorption and formation occurs, driven by B and T cells of the adaptive immune arm. Excessive orthodontic forces or tooth movement in periodontally affected inflamed tissues may hamper resolution, leading to "maladaptive homeostasis" and tissue loss due to uncoupled bone resorption and formation. The review ends with a brief description of the translational studies on OTM immunomodulation. Future studies are necessary for further uncovering cellular and molecular immune targets and developing novel strategies for controlling OTM by local and sustained tuning of the inflammatory process.
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Affiliation(s)
- S Chaushu
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - Y Klein
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,Department of Biochemistry, Institute for Medical Research Israel-Canada, Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - O Mandelboim
- Lautenberg Center for Cancer Immunology, Faculty of Medicine, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - Y Barenholz
- Department of Biochemistry, Institute for Medical Research Israel-Canada, Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - O Fleissig
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
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Jeon HH, Teixeira H, Tsai A. Mechanistic Insight into Orthodontic Tooth Movement Based on Animal Studies: A Critical Review. J Clin Med 2021; 10:jcm10081733. [PMID: 33923725 PMCID: PMC8072633 DOI: 10.3390/jcm10081733] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/07/2021] [Accepted: 04/13/2021] [Indexed: 01/09/2023] Open
Abstract
Alveolar bone remodeling in orthodontic tooth movement (OTM) is a highly regulated process that coordinates bone resorption by osteoclasts and new bone formation by osteoblasts. Mechanisms involved in OTM include mechano-sensing, sterile inflammation-mediated osteoclastogenesis on the compression side and tensile force-induced osteogenesis on the tension side. Several intracellular signaling pathways and mechanosensors including the cilia and ion channels transduce mechanical force into biochemical signals that stimulate formation of osteoclasts or osteoblasts. To date, many studies were performed in vitro or using human gingival crevicular fluid samples. Thus, the use of transgenic animals is very helpful in examining a cause and effect relationship. Key cell types that participate in mediating the response to OTM include periodontal ligament fibroblasts, mesenchymal stem cells, osteoblasts, osteocytes, and osteoclasts. Intercellular signals that stimulate cellular processes needed for orthodontic tooth movement include receptor activator of nuclear factor-κB ligand (RANKL), tumor necrosis factor-α (TNF-α), dickkopf Wnt signaling pathway inhibitor 1 (DKK1), sclerostin, transforming growth factor beta (TGF-β), and bone morphogenetic proteins (BMPs). In this review, we critically summarize the current OTM studies using transgenic animal models in order to provide mechanistic insight into the cellular events and the molecular regulation of OTM.
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13
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Xi X, Zhao Y, Liu H, Li Z, Chen S, Liu D. Nrf2 activation is involved in osteogenic differentiation of periodontal ligament stem cells under cyclic mechanical stretch. Exp Cell Res 2021; 403:112598. [PMID: 33865812 DOI: 10.1016/j.yexcr.2021.112598] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/30/2021] [Accepted: 04/04/2021] [Indexed: 12/28/2022]
Abstract
During orthodontic treatment, mechanical stretch serves a crucial function in osteogenic differentiation of periodontal ligament stem cells (PDLSCs). Up-regulated reactive oxygen species (ROS) level is a result of cyclic mechanical stretch in many cell types. Nuclear factor erythroid-2-related factor-2 (Nrf2) is a master regulator in various antioxidants expression. However, it is not known whether cyclic mechanical stretch could induce the ROS generation in PDLSCs and whether Nrf2 participated in this process. The present study was aimed to investigate the role of Nrf2 in PDLSCs under cyclic mechanical stretch. Our results showed that cyclic mechanical stretch increased ROS level and the nuclear accumulation of Nrf2 during osteoblast differentiation. Knocking down Nrf2 by siRNA transfection increased ROS formation and suppressed osteogenic differentiation in PDLSCs. T-BHQ, a Nrf2 activator, promoted the osteogenic differentiation in PDLSCs under cyclic mechanical stretch, and improved the microstructure of alveolar bone during orthodontic tooth movement in rats by employing micro-CT system. Taken together, Nrf2 activation was involved in osteogenic differentiation under cyclic mechanical stretch in PDLSCs. T-BHQ could promote the osteogenic differentiation in vitro and in vivo, suggesting a promising option for the remodeling of the alveolar bone during orthodontic tooth movement.
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Affiliation(s)
- Xun Xi
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China
| | - Yi Zhao
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China
| | - Hong Liu
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China
| | - Zixuan Li
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China
| | - Shuai Chen
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China
| | - Dongxu Liu
- School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University, China; Shandong Key Laboratory of Oral Tissue Regeneration, Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, China.
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Ferrigno B, Bordett R, Duraisamy N, Moskow J, Arul MR, Rudraiah S, Nukavarapu SP, Vella AT, Kumbar SG. Bioactive polymeric materials and electrical stimulation strategies for musculoskeletal tissue repair and regeneration. Bioact Mater 2020; 5:468-485. [PMID: 32280836 PMCID: PMC7139146 DOI: 10.1016/j.bioactmat.2020.03.010] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 03/15/2020] [Accepted: 03/20/2020] [Indexed: 12/14/2022] Open
Abstract
Electrical stimulation (ES) is predominantly used as a physical therapy modality to promote tissue healing and functional recovery. Research efforts in both laboratory and clinical settings have shown the beneficial effects of this technique for the repair and regeneration of damaged tissues, which include muscle, bone, skin, nerve, tendons, and ligaments. The collective findings of these studies suggest ES enhances cell proliferation, extracellular matrix (ECM) production, secretion of several cytokines, and vasculature development leading to better tissue regeneration in multiple tissues. However, there is still a gap in the clinical relevance for ES to better repair tissue interfaces, as ES applied clinically is ineffective on deeper tissue. The use of a conducting material can transmit the stimulation applied from skin electrodes to the desired tissue and lead to an increased function on the repair of that tissue. Ionically conductive (IC) polymeric scaffolds in conjunction with ES may provide solutions to utilize this approach effectively. Injectable IC formulations and their scaffolds may provide solutions for applying ES into difficult to reach tissue types to enable tissue repair and regeneration. A better understanding of ES-mediated cell differentiation and associated molecular mechanisms including the immune response will allow standardization of procedures applicable for the next generation of regenerative medicine. ES, along with the use of IC scaffolds is more than sufficient for use as a treatment option for single tissue healing and may fulfill a role in interfacing multiple tissue types during the repair process.
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Affiliation(s)
- Bryan Ferrigno
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Rosalie Bordett
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Nithyadevi Duraisamy
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Joshua Moskow
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Michael R. Arul
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Swetha Rudraiah
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
- Department of Pharmaceutical Sciences, University of Saint Joseph, Hartford, CT, USA
| | - Syam P. Nukavarapu
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
| | - Anthony T. Vella
- Department of Department of Immunology, University of Connecticut Health, Farmington, CT, USA
| | - Sangamesh G. Kumbar
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, USA
- Department of Orthopedic Surgery, University of Connecticut Health, Farmington, CT, USA
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