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Chen PJ, Mehta S, Dutra EH, Yadav S. Alendronate treatment rescues the effects of compressive loading of TMJ in osteogenesis imperfecta mice. Prog Orthod 2024; 25:25. [PMID: 39004686 PMCID: PMC11247069 DOI: 10.1186/s40510-024-00526-2] [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: 05/13/2024] [Accepted: 05/21/2024] [Indexed: 07/16/2024] Open
Abstract
BACKGROUND Osteogenesis imperfecta (OI) is a genetic disorder of connective tissue caused by mutations associated with type I collagen, which results in defective extracellular matrix in temporomandibular joint (TMJ) cartilage and subchondral bone. TMJ is a fibrocartilaginous joint expressing type I collagen both in the cartilage and the subchondral bone. In the present study the effects of alendronate and altered loading of the TMJ was analyzed both in male and female OI mice. MATERIALS AND METHODS Forty-eight, 10-weeks-old male and female OI mice were divided into 3 groups: (1) Control group: unloaded group, (2) Saline + Loaded: Saline was injected for 2 weeks and then TMJ of mice was loaded for 5 days, (3) alendronate + loaded: alendronate was injected for 2 weeks and then TMJ of mice was loaded for 5 days. Mice in all the groups were euthanized 24-h after the final loading. RESULTS Alendronate pretreatment led to significant increase in bone volume and tissue density. Histomorphometrically, alendronate treatment led to increase in mineralization, cartilage thickness and proteoglycan distribution. Increased mineralization paralleled decreased osteoclastic activity. Our immunohistochemistry revealed decreased expression of matrix metallopeptidase 13 and ADAM metallopeptidase with thrombospondin type 1 motif 5. CONCLUSION The findings of this research support that alendronate prevented the detrimental effects of loading on the extracellular matrix of the TMJ cartilage and subchondral bone.
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Affiliation(s)
- Po-Jung Chen
- Department of Growth and Development, College of Dentistry, University of Nebraska Medical Center, Lincoln/Omaha, NE, USA.
| | - Shivam Mehta
- Department of Orthodontics, School of Dentistry, Texas A&M University, Dallas, TX, USA
| | - Eliane H Dutra
- Division of Orthodontics, School of Dental Medicine, UConn Health, Farmington, CT, USA
| | - Sumit Yadav
- Department of Growth and Development, College of Dentistry, University of Nebraska Medical Center, Lincoln/Omaha, NE, USA
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2
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Liu Y, Jia F, Li K, Liang C, Lin X, Geng W, Li Y. Critical signaling molecules in the temporomandibular joint osteoarthritis under different magnitudes of mechanical stimulation. Front Pharmacol 2024; 15:1419494. [PMID: 39055494 PMCID: PMC11269110 DOI: 10.3389/fphar.2024.1419494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Accepted: 06/14/2024] [Indexed: 07/27/2024] Open
Abstract
The mechanical stress environment in the temporomandibular joint (TMJ) is constantly changing due to daily mandibular movements. Therefore, TMJ tissues, such as condylar cartilage, the synovial membrane and discs, are influenced by different magnitudes of mechanical stimulation. Moderate mechanical stimulation is beneficial for maintaining homeostasis, whereas abnormal mechanical stimulation leads to degeneration and ultimately contributes to the development of temporomandibular joint osteoarthritis (TMJOA), which involves changes in critical signaling molecules. Under abnormal mechanical stimulation, compensatory molecules may prevent degenerative changes while decompensatory molecules aggravate. In this review, we summarize the critical signaling molecules that are stimulated by moderate or abnormal mechanical loading in TMJ tissues, mainly in condylar cartilage. Furthermore, we classify abnormal mechanical stimulation-induced molecules into compensatory or decompensatory molecules. Our aim is to understand the pathophysiological mechanism of TMJ dysfunction more deeply in the ever-changing mechanical environment, and then provide new ideas for discovering effective diagnostic and therapeutic targets in TMJOA.
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Affiliation(s)
| | | | | | | | | | - Wei Geng
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Yanxi Li
- Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
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3
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Dechaufour P, Libouban H, Chappard D, Kün-Darbois JD. Repeated unilateral injections of botulinum toxin in masticatory muscles in adult rats do not amplify condylar and alveolar bone loss nor modify the volume of the hypertrophic bone proliferation at enthesis. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2024:101955. [PMID: 38950733 DOI: 10.1016/j.jormas.2024.101955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/14/2024] [Accepted: 06/24/2024] [Indexed: 07/03/2024]
Abstract
OBJECTIVES Botulinum toxin is used in human in repeatedly masticatory muscles injections. A single BTX injection in animal induces mandibular bone loss with a muscle enthesis hypertrophic metaplasia. Our aim was to evaluate mandibular bone changes after unilateral repeated injections of BTX in adult rats. STUDY DESIGN Mature male rats were randomized into 3 groups: one, two or three injections. Each rat received injections in right masseter and temporalis muscles. The left side was the control side. Microcomputed tomography was used to perform 2D and 3D analyses. RESULTS Bone loss was evidenced on the right sides of alveolar and condylar bone. Alveolar bone volume increased in both control left side and injected right side whereas condylar bone volume remained constant in all groups, for both sides. Enthesis bone hypertrophic metaplasias were evidenced on the BTX injected sides without any modification with the number of injections. CONCLUSION BTX repeated injections in masticatory muscles lead to major mandibular condylar and alveolar bone loss that does not worsen. They lead to the occurrence of an enthesis bone proliferation that is not dependent on the number of injections. These results are an argument for the safety of BTX injections in masticatory muscles in human.
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Affiliation(s)
- Pierre Dechaufour
- Univ Angers, Nantes Université, Oniris, Inserm, RMeS, REGOS, SFR ICAT, F-49000 Angers, France; CHU Angers, Service de Chirurgie Maxillo-faciale, F-49933 Angers, France
| | - Hélène Libouban
- Univ Angers, Nantes Université, Oniris, Inserm, RMeS, REGOS, SFR ICAT, F-49000 Angers, France
| | - Daniel Chappard
- Univ Angers, Nantes Université, Oniris, Inserm, RMeS, REGOS, SFR ICAT, F-49000 Angers, France
| | - Jean-Daniel Kün-Darbois
- Univ Angers, Nantes Université, Oniris, Inserm, RMeS, REGOS, SFR ICAT, F-49000 Angers, France; CHU Angers, Service de Chirurgie Maxillo-faciale, F-49933 Angers, France.
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4
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Moussa MS, Bachour D, Komarova SV. Adverse effect of botulinum toxin-A injections on mandibular bone: A systematic review and meta-analysis. J Oral Rehabil 2024; 51:404-415. [PMID: 37668276 DOI: 10.1111/joor.13590] [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: 05/30/2023] [Revised: 08/15/2023] [Accepted: 08/21/2023] [Indexed: 09/06/2023]
Abstract
INTRODUCTION Botulinum toxin-A (BTX) is a potent neurotoxin that is emerging in the scope of dental practice for its ability to temporarily paralyse musculature and reduce hyperfunction. This may be desirable in diseases/disorders associated with hyperactive muscles such as the muscles of mastication, most implicated in painful temporomandibular disorders (TMDs). The use of BTX extends beyond its indications with off-label use in TMD's and other conditions, while potential adverse effects remain understudied. BTX is well-established hindlimb paralysis model in animals leading to significant bone loss with underlying mechanisms remaining unclear. The objective of this study is to systematically review the literature for articles investigating changes in mandibular bone following BTX injections and meta-analyse available data on reported bone outcomes. METHODS Comprehensive search of Medline, Embase and Web of Science retrieved 934 articles. Following the screening process, 36 articles in animals and humans were included for quantitative synthesis. Articles in human individuals (6) and three different animal species (14) presented mandibular bone outcomes that were included in the meta-analysis. RESULTS The masseter and temporalis muscles were frequently injected across all species. In humans, we observe a decrease of about 6% in cortical thickness of mandibular regions following BTX injection with no evident changes in either volume or density of bone structures. In animals, bone loss in the condylar region is significantly high in both cortical and trabecular compartments. DISCUSSION Our analysis supports the concept of BTX-induced bone-loss model in animal mandibles. Further, bone loss might be confined to the cortical compartments in humans. Most studies did not address the reality of repeated injections and excessive dosing, which occur due to the reversible action of BTX. More rigorous trials are needed to draw a full picture of potential long-term adverse effects on bone.
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Affiliation(s)
- Mahmoud S Moussa
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
- Shriners Hospital for Children - Canada, Montreal, Quebec, Canada
| | - Dona Bachour
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
| | - Svetlana V Komarova
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
- Shriners Hospital for Children - Canada, Montreal, Quebec, Canada
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5
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Zhou Y, Al‐Naggar IMA, Chen P, Gasek NS, Wang K, Mehta S, Kuchel GA, Yadav S, Xu M. Senolytics alleviate the degenerative disorders of temporomandibular joint in old age. Aging Cell 2021; 20:e13394. [PMID: 34101970 PMCID: PMC8282237 DOI: 10.1111/acel.13394] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 03/31/2021] [Accepted: 05/08/2021] [Indexed: 01/09/2023] Open
Abstract
Aging is one of the major risk factors for degenerative joint disorders, including those involving the temporomandibular joint (TMJ). TMJ degeneration occurs primarily in the population over 65, significantly increasing the risk of joint discomfort, restricted joint mobility, and reduced quality of life. Unfortunately, there is currently no effective mechanism‐based treatment available in the clinic to alleviate TMJ degeneration with aging. We now demonstrate that intermittent administration of senolytics, drugs which can selectively clear senescent cells, preserved mandibular condylar cartilage thickness, improved subchondral bone volume and turnover, and reduced Osteoarthritis Research Society International (OARSI) histopathological score in both 23‐ to 24‐month‐old male and female mice. Senolytics had little effect on 4 months old young mice, indicating age‐specific benefits. Our study provides proof‐of‐concept evidence that age‐related TMJ degeneration can be alleviated by pharmaceutical intervention targeting cellular senescence. Since the senolytics used in this study have been proven relatively safe in recent human studies, our findings may help justify future clinical trials addressing TMJ degeneration in old age.
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Affiliation(s)
- Yueying Zhou
- Xiangya Stomatological Hospital and School of Stomatology Central South University Changsha Hunan China
- UConn Center on Aging UConn Health Farmington CT USA
- Center for Regenerative Medicine and Skeletal Development UConn Health Farmington CT USA
| | | | - Po‐Jung Chen
- Division of Orthodontics UConn Health Farmington CT USA
| | - Nathan S. Gasek
- UConn Center on Aging UConn Health Farmington CT USA
- Department of Genetics and Genome Sciences UConn Health Farmington CT USA
| | - Ke Wang
- Division of Orthodontics UConn Health Farmington CT USA
| | - Shivam Mehta
- Division of Orthodontics UConn Health Farmington CT USA
| | | | - Sumit Yadav
- Division of Orthodontics UConn Health Farmington CT USA
| | - Ming Xu
- UConn Center on Aging UConn Health Farmington CT USA
- Department of Genetics and Genome Sciences UConn Health Farmington CT USA
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6
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Zhang Y, Liu Q, Xu X, Zhou P, Zhang H, Yang H, Zhang M, Zhang J, Lu L, Liu J, Wang M. Long-term effect of bilateral anterior elevation of occlusion on the temporomandibular joints. Oral Dis 2021; 28:1911-1920. [PMID: 33979023 DOI: 10.1111/odi.13914] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 05/01/2021] [Accepted: 05/04/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Incisors tubed prosthesis with bilateral anterior elevation (BAE) relation had been reported to stimulate the proliferative response in the mandibular condylar cartilage of mice, thus the prosthetic occlusion elevation had been proposed to treat cartilage degeneration. Currently, we aimed to detect the long-term effect of BAE on temporomandibular joints (TMJs). MATERIALS AND METHODS Twelve 6-week-old female mice were assigned to age-matched control and BAE groups (n = 6). Micro-CT images and the macro- and micro-morphology of the mandibular condyles were analyzed at 29 weeks. RESULTS Compared with the age-matched controls, in BAE group, there were loss of subchondral cortical bone and heavy loss of the subchondral trabecular bone at the superior sites of the TMJ condyles, but hyperostosis at the inferior sites as revealed by micro-CT images and histological slices. In BAE group, cartilage thickness and matrix area were increased with upregulated expression of type II, type X collagen, and Ki67, but the expression of cleaved caspase-3 was downregulated (all, p < 0.05). CONCLUSION In addition to cartilage thickening, long-term BAE induces loss of the subchondral cortical bone and heavy loss of the underneath subchondral trabecular bone, but hyperostosis further underneath. Using BAE as a treatment remains double-edged.
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Affiliation(s)
- Yuejiao Zhang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,School of Stomatology, Jiamusi University, Jiamusi, Heilongjiang, P.R.China
| | - Qian Liu
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Xiaojie Xu
- The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
| | - Peng Zhou
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,School of Stomatology, Jiamusi University, Jiamusi, Heilongjiang, P.R.China
| | - Hongyun Zhang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Hongxu Yang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Mian Zhang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jing Zhang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Lei Lu
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Jiguang Liu
- School of Stomatology, Jiamusi University, Jiamusi, Heilongjiang, P.R.China
| | - Meiqing Wang
- Department of Oral Anatomy and Physiology and Clinic of temporomandibular Joint Disorders and Oral and Maxillofacial Pain, The Key Laboratory of Military Stomatology of State and the National Clinical Research Center for Oral Diseases, School of Stomatology, The Fourth Military Medical University, Xi'an, China.,School of Stomatology, Jiamusi University, Jiamusi, Heilongjiang, P.R.China.,The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang, China
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7
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Li H, Liao L, Hu Y, Xu Y, Zhang Y, Huo F, Tian W, Guo W. Identification of Type H Vessels in Mice Mandibular Condyle. J Dent Res 2021; 100:983-992. [PMID: 33764221 DOI: 10.1177/00220345211002120] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Type H vessel is a specific vessel subtype that is strongly positive for CD31 and endomucin (CD31hiEmcnhi). It has already been identified that it can tightly regulate the coupling of angiogenesis and osteogenesis in the long bone of mice and human beings. The long bone is formed through endochondral ossification, which is the same type of process happening in mandibular condyle. Although the ossification of long bone and mandibular condyle has the same developmental process, the existence of type H vessels in the mouse condyle remains unclear. To address this, we identified that abundant type H vessels existed in the subchondral bone of the mouse condylar head and endosteum of the mouse condylar neck. Meanwhile, immunofluorescence imaging of the condyles in different ages of male C57BL/6J mice demonstrated that type H vessels decreased while aging. Furthermore, we validated a positive correlation between type H vessels and Osterix+ osteoprogenitors in the condyle induced by mandibular advancement. Mechanistically, we confirmed that deferoxamine mesylate, which promoted the proliferation of type H endothelial cells by activating hypoxia-inducible factor 1α (HIF-1α) signaling pathways, largely prevented the osteopenia in the condyle induced by botulinum toxin type A. Collectively, these results demonstrate that in the mouse condyle, type H vessels in areas of high function positively correlate with bone formation. In addition, we show a novel influence of HIF-1α signaling on osteogenesis via an increase in type H vessels. In conclusion, promoting angiogenesis of type H vessels is a promising strategy for the therapeutic improvement of osteogenesis in mandibular condyle.
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Affiliation(s)
- H Li
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - L Liao
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Y Hu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Preventive Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Y Xu
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Y Zhang
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - F Huo
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - W Tian
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - W Guo
- Engineering Research Center of Oral Translational Medicine, Ministry of Education, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.,Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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8
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Terhune CE, Sylvester AD, Scott JE, Ravosa MJ. Internal architecture of the mandibular condyle of rabbits is related to dietary resistance during growth. J Exp Biol 2020; 223:jeb220988. [PMID: 32127379 DOI: 10.1242/jeb.220988] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 02/25/2020] [Indexed: 12/11/2022]
Abstract
Although there is considerable evidence that bone responds to the loading environment in which it develops, few analyses have examined phenotypic plasticity or bone functional adaptation in the masticatory apparatus. Prior work suggests that masticatory morphology is sensitive to differences in food mechanical properties during development; however, the importance of the timing/duration of loading and variation in naturalistic diets is less clear. Here, we examined microstructural and macrostructural differences in the mandibular condyle in four groups of white rabbits (Oryctolagus cuniculus) raised for a year on diets that varied in mechanical properties and timing of the introduction of mechanically challenging foods, simulating seasonal variation in diet. We employed sliding semilandmarks to locate multiple volumes of interest deep to the mandibular condyle articular surface, and compared bone volume fraction, trabecular thickness and spacing, and condylar size/shape among experimental groups. The results reveal a shared pattern of bony architecture across the articular surface of all treatment groups, while also demonstrating significant among-group differences. Rabbits raised on mechanically challenging diets have significantly increased bone volume fraction relative to controls fed a less challenging diet. The post-weaning timing of the introduction of mechanically challenging foods also influences architectural properties, suggesting that bone plasticity can extend well into adulthood and that bony responses to changes in loading may be rapid. These findings demonstrate that bony architecture of the mandibular condyle in rabbits responds to variation in mechanical loading during an organism's lifetime and has the potential to track dietary variation within and among species.
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Affiliation(s)
- Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, AR 72701, USA
| | - Adam D Sylvester
- Center for Functional Anatomy and Evolution, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Jeremiah E Scott
- Department of Medical Anatomical Sciences, Western University of Health Sciences, Pomona, CA 91766, USA
| | - Matthew J Ravosa
- Departments of Biological Sciences, Aerospace & Mechanical Engineering, and Anthropology, University of Notre Dame, Notre Dame, IN 46556, USA
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9
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Yotsuya M, Iriarte-Diaz J, A Reed D. Temporomandibular Joint Hypofunction Secondary to Unilateral Partial Discectomy Attenuates Degeneration in Murine Mandibular Condylar Cartilage. THE BULLETIN OF TOKYO DENTAL COLLEGE 2020; 61:9-19. [PMID: 32101827 DOI: 10.2209/tdcpublication.2019-0008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Mechanical overloading of the temporomandibular joint (TMJ) promotes both the initiation and progression of TMJ osteoarthritis (OA). New preclinical animal models are needed for the evaluation of the molecular basis of cellular load transmission. This would allow a better understanding of the underlying mechanisms of TMJ-OA pain and disability, and help identify new therapeutics for its early diagnosis and management. The purpose of this study was to evaluate the role of mechanical loading in the progression of TMJ-OA in surgical instability arising from unilateral partial discectomy (UPD) in a murine model. In the theoretical modelling employed, lower joint reaction forces were observed on the chewing (working) side of the TMJ in the murine craniomandibular musculoskeletal system. Hypofunction was induced secondary to UPD through surgically manipulating the working side using an unopposed molar model. When the working side was restricted to the same side as that on which UPD was performed, late-stage degeneration of the cartilage showed a significant reduction (p<0.05), with diminished fibrillation and erosion of the articular cartilage, cell clustering, and hypocellularity. Condylar remodelling and proteolysis of proteoglycans were less affected. Thus, select and specific late-stage changes in TMJ-OA were contextually linked with the local mechanical environment of the joint. These data underscore the value of the UPD mouse model in studying mechanobiological pathways activated during TMJ-OA, and suggest that therapeutically targeting mechanobiological stimuli is an effective strategy in improving long-term biological, clinical, and patient-based outcomes.
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Affiliation(s)
- Mamoru Yotsuya
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago.,Department of Fixed Prosthodontics, Tokyo Dental College
| | | | - David A Reed
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago
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10
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Zhou P, Zhang J, Zhang M, Yang H, Liu Q, Zhang H, Liu J, Duan J, Lu Y, Wang M. Effects of occlusion modification on the remodelling of degenerative mandibular condylar processes. Oral Dis 2020; 26:597-608. [DOI: 10.1111/odi.13274] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/27/2019] [Accepted: 12/15/2019] [Indexed: 02/06/2023]
Affiliation(s)
- Ping Zhou
- Hunan Key Laboratory of Oral Health Research Hunan 3D Printing Engineering Research Center of Oral Care Hunan Clinical Research Center of Oral Major Diseases and Oral Health Xiangya Stomatological Hospital Xiangya School of Stomatology Central South University Changsha China
| | - Jing Zhang
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Mian Zhang
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Hongxu Yang
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Qian Liu
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Hongyun Zhang
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Jinqiang Liu
- School of Stomatology Jiamusi University Jiamusi China
| | - Jing Duan
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
| | - Yanqin Lu
- Hunan Key Laboratory of Oral Health Research Hunan 3D Printing Engineering Research Center of Oral Care Hunan Clinical Research Center of Oral Major Diseases and Oral Health Xiangya Stomatological Hospital Xiangya School of Stomatology Central South University Changsha China
| | - Mei‐Qing Wang
- Department of Oral Anatomy and Physiology and Clinic of Temporomandibular Joint Disorders and Oral and Maxillofacial Pain The Key Laboratory of Military Stomatology of State the National Clinical Research Center for Oral Diseases School of Stomatology The Fourth Military Medical University Xi’an China
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Balanta-Melo J, Toro-Ibacache V, Kupczik K, Buvinic S. Mandibular Bone Loss after Masticatory Muscles Intervention with Botulinum Toxin: An Approach from Basic Research to Clinical Findings. Toxins (Basel) 2019; 11:toxins11020084. [PMID: 30717172 PMCID: PMC6409568 DOI: 10.3390/toxins11020084] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 01/23/2019] [Accepted: 01/28/2019] [Indexed: 12/14/2022] Open
Abstract
The injection of botulinum toxin type A (BoNT/A) in the masticatory muscles, to cause its temporary paralysis, is a widely used intervention for clinical disorders such as oromandibular dystonia, sleep bruxism, and aesthetics (i.e., masseteric hypertrophy). Considering that muscle contraction is required for mechano-transduction to maintain bone homeostasis, it is relevant to address the bone adverse effects associated with muscle condition after this intervention. Our aim is to condense the current and relevant literature about mandibular bone loss in fully mature mammals after BoNT/A intervention in the masticatory muscles. Here, we compile evidence from animal models (mice, rats, and rabbits) to clinical studies, demonstrating that BoNT/A-induced masticatory muscle atrophy promotes mandibular bone loss. Mandibular bone-related adverse effects involve cellular and metabolic changes, microstructure degradation, and morphological alterations. While bone loss has been detected at the mandibular condyle or alveolar bone, cellular and molecular mechanisms involved in this process must still be elucidated. Further basic research could provide evidence for designing strategies to control the undesired effects on bone during the therapeutic use of BoNT/A. However, in the meantime, we consider it essential that patients treated with BoNT/A in the masticatory muscles be warned about a putative collateral mandibular bone damage.
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Affiliation(s)
- Julián Balanta-Melo
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- School of Dentistry, Universidad del Valle, Cali 760043, Colombia.
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany.
| | - Viviana Toro-Ibacache
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany.
| | - Kornelius Kupczik
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany.
- Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
| | - Sonja Buvinic
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago 8380492, Chile.
- Center for Exercise, Metabolism and Cancer Studies CEMC2016, Faculty of Medicine, Universidad de Chile, Independencia 8380453, Chile.
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Balanta-Melo J, Torres-Quintana MA, Bemmann M, Vega C, González C, Kupczik K, Toro-Ibacache V, Buvinic S. Masseter muscle atrophy impairs bone quality of the mandibular condyle but not the alveolar process early after induction. J Oral Rehabil 2018; 46:233-241. [PMID: 30468522 DOI: 10.1111/joor.12747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/15/2018] [Accepted: 11/17/2018] [Indexed: 12/27/2022]
Abstract
BACKGROUND Masseter muscle function influences mandibular bone homeostasis. As previously reported, bone resorption markers increased in the mouse mandibular condyle two days after masseter paralysis induced with botulinum toxin type A (BoNTA), followed by local bone loss. OBJECTIVE This study aimed to evaluate the bone quality of both the mandibular condyle and alveolar process in the mandible of adult mice during the early stage of a BoNTA-induced masseter muscle atrophy, using a combined 3D histomorphometrics and shape analysis approach. METHODS Adult BALB/c mice were divided into an untreated control group and an experimental group; the latter received one single BoNTA injection in the right masseter (BoNTA-right) and saline in the left masseter (Saline-left). 3D bone microstructural changes in the mandibular condyle and alveolar process were determined with high-resolution microtomography. Additionally, landmark-based geometric morphometrics was implemented to assess external shape changes. RESULTS After 2 weeks, masseter mass was significantly reduced (P-value <0.001). When compared to Saline-left and untreated condyles, BoNTA-right condyles showed significant bone loss (P-value <0.001) and shape changes. No significant bone loss was observed in the alveolar processes of any of the groups (P-value >0.05). CONCLUSION Condyle bone quality deteriorates at an early stage of BoNTA-induced masseter muscle atrophy, and before the alveolar process is affected. Since the observed bone microstructural changes resemble those in human temporomandibular joint degenerative disorders, the clinical safety of BoNTA intervention in the masticatory apparatus remains to be clarified.
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Affiliation(s)
- Julián Balanta-Melo
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,School of Dentistry, Universidad del Valle, Cali, Colombia.,Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | | | - Maximilian Bemmann
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Carolina Vega
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | | | - Kornelius Kupczik
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - Viviana Toro-Ibacache
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Sonja Buvinic
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Center for Exercise, Metabolism and Cancer Studies CEMC2016, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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MMP-3 and MMP-8 in rat mandibular condylar cartilage associated with dietary loading, estrogen level, and aging. Arch Oral Biol 2018; 97:238-244. [PMID: 30412863 DOI: 10.1016/j.archoralbio.2018.10.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 10/02/2018] [Accepted: 10/30/2018] [Indexed: 12/18/2022]
Abstract
OBJECTIVES The structure of the mandibular condylar cartilage (MCC) is regulated by dynamic and multifactorial processes. The aim of this study was to examine the effects of altered dietary loading, estrogen level, and aging on the structure of the condylar cartilage and the expressions of matrix metalloproteinase (MMP) -3 and MMP-8 of rat MCC. METHODS In this study, Crl:CD (SD) female rats were randomly divided into 3 groups according to dietary hardness: hard diet (diet board), normal diet (pellet), and soft diet (powder). In each group, the rats were further divided into 2 subgroups by ovariectomy at the age of 7 weeks. The rats were sacrificed at 5- and 14-month-old. Histomorphometric analysis of the MCC thickness was performed after toluidine blue staining. Immunochemical staining was done for MMP-3 and MMP-8. A linear mixed model was used to assess the effects of dietary loading, estrogen level, and aging. RESULTS Increased dietary loading was the main factor to increase the MMP-3 expression and the anterior and central thickness of the MCC. Lack of estrogen was the main factor associated with decreased MMP-8. Aging was associated with the thickness changes of the whole condylar cartilage and the reduced expression of MMP-8. CONCLUSION The condylar cartilage structure and metabolism of the female rats are sensitive to dietary loading changes, estrogen level as well as aging. The proper balance of these factors seems to be essential for the maintenance of the condylar cartilage.
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