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Wang Y, Wang J, Xu T, Yang S, Wang X, Zhu L, Li N, Liu B, Xiao J, Liu C. Ectopic Activation of Fgf8 in Dental Mesenchyme Causes Incisor Agenesis and Molar Microdontia. Int J Mol Sci 2024; 25:7045. [PMID: 39000154 PMCID: PMC11241644 DOI: 10.3390/ijms25137045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/16/2024] Open
Abstract
Putatively, tooth agenesis was attributed to the initiation failure of tooth germs, though little is known about the histological and molecular alterations. To address if constitutively active FGF signaling is associated with tooth agenesis, we activated Fgf8 in dental mesenchyme with Osr-cre knock-in allele in mice (Osr2-creKI; Rosa26R-Fgf8) and found incisor agenesis and molar microdontia. The cell survival assay showed tremendous apoptosis in both the Osr2-creKI; Rosa26R-Fgf8 incisor epithelium and mesenchyme, which initiated incisor regression from cap stage. In situ hybridization displayed vanished Shh transcription, and immunostaining exhibited reduced Runx2 expression and enlarged mesenchymal Lef1 domain in Osr2-creKI; Rosa26R-Fgf8 incisors, both of which were suggested to enhance apoptosis. In contrast, Osr2-creKI; Rosa26R-Fgf8 molar germs displayed mildly suppressed Shh transcription, and the increased expression of Ectodin, Runx2 and Lef1. Although mildly smaller than WT controls prenatally, the Osr2-creKI; Rosa26R-Fgf8 molar germs produced a miniature tooth with impaired mineralization after a 6-week sub-renal culture. Intriguingly, the implanted Osr2-creKI; Rosa26R-Fgf8 molar germs exhibited delayed odontoblast differentiation and accelerated ameloblast maturation. Collectively, the ectopically activated Fgf8 in dental mesenchyme caused incisor agenesis by triggering incisor regression and postnatal molar microdontia. Our findings reported tooth agenesis resulting from the regression from the early bell stage and implicated a correlation between tooth agenesis and microdontia.
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Affiliation(s)
- Yu Wang
- Institute of Stomatology, Binzhou Medical University, Yantai 264003, China;
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Jingjing Wang
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Tian Xu
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Shuhui Yang
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Xinran Wang
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Lei Zhu
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Nan Li
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Bo Liu
- Institute for Genome Engineered Animal Models of Human Diseases, Dalian Medical University, Dalian 116044, China;
| | - Jing Xiao
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
| | - Chao Liu
- Department of Oral Pathology, School of Stomatology, Dalian Medical University, Dalian 116044, China; (J.W.); (T.X.); (S.Y.); (X.W.); (L.Z.); (N.L.)
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Ge J, Bo L, Zhang D, Wei X, Li J, Zhao J, Yue S, Xie Q, Shen P, Ma Z, Fang B, Yang C. Association between bilateral condylar resorption and reduced volumes of the craniofacial skeleton and masticatory muscles in adult patients: A retrospective study. Heliyon 2024; 10:e25037. [PMID: 38333825 PMCID: PMC10850897 DOI: 10.1016/j.heliyon.2024.e25037] [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: 03/15/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 02/10/2024] Open
Abstract
Objectives This retrospective cohort study aimed to analyze volumes of craniomaxillofacial bone and masticatory muscles of young adults with bilateral idiopathic condylar resorption. Methods This was a retrospective cohort study of 84 adults with bilateral idiopathic condylar resorption (BCR) and 48 adults with normal temporal-mandibular joint (TMJ) matched for age and sex (mean age, 23.2 ± 3.6 years). The volumes of craniomaxillofacial bone and masticatory muscles, as well as intercondylar angle were measured. Unpaired t-tests and Pearson correlation tests were applied to analyze the data. Multivariable linear regression models were used to estimate the association between bilateral condylar volume and volumes of craniomaxillofacial bone and masticatory muscles adjusted for age, sex, and disc status. Results Compared to the control group, the BCR group displayed significant decreased volumes of craniomaxillofacial bone (p < 0.001), craniomaxillofacial bone without mandible (p < 0.001), mandible (p < 0.001), mandible without mandibular condylar process (p < 0.001), bilateral masseter muscle (p < 0.001) and bilateral temporalis muscle (p < 0.001), as well as the intercondylar angle (p < 0.001). These variables were significantly correlated to the volume of mandibular condylar process (0.5< r < 0.8; p < 0.001). By linear regression analyses, significant associations were found for the bilateral condylar volume with craniomaxillofacial bone volume and mandible bone volume. Conclusions Young adults with BCR displayed smaller volumes of craniomaxillofacial skeleton and masticatory muscles, and smaller intercondylar angle than the normal patients. The craniofacial musculoskeletal volume and intercondylar angle are associated with mandibular condylar process volume.
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Affiliation(s)
- Jing Ge
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lingtong Bo
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Dahe Zhang
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiang Wei
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jiayi Li
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jiong Zhao
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shijing Yue
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qianyang Xie
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Pei Shen
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhigui Ma
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bing Fang
- Department of Orthodontics, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Chi Yang
- Department of Oral Surgery, Shanghai Ninth People's Hospital, Collage of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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