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Liu Q, Zhao Y, Shi H, Xiang D, Wu C, Song L, Ma N, Sun H. Long-term haplodeficency of DSPP causes temporomandibular joint osteoarthritis in mice. BMC Oral Health 2024; 24:569. [PMID: 38745274 PMCID: PMC11094853 DOI: 10.1186/s12903-024-04320-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 05/02/2024] [Indexed: 05/16/2024] Open
Abstract
BACKGROUND Extracellular matrix (ECM) protein malfunction or defect may lead to temporomandibular joint osteoarthritis (TMJ OA). Dentin sialophophoprotein (DSPP) is a mandibular condylar cartilage ECM protein, and its deletion impacted cell proliferation and other extracellular matrix alterations of postnatal condylar cartilage. However, it remains unclear if long-term loss of function of DSPP leads to TMJ OA. The study aimed to test the hypothesis that long-term haploinsufficiency of DSPP causes TMJ OA. MATERIALS AND METHODS To determine whether Dspp+/- mice exhibit TMJ OA but no severe tooth defects, mandibles of wild-type (WT), Dspp+/-, and Dspp homozygous (Dspp-/-) mice were analyzed by Micro-computed tomography (micro-CT). To characterize the progression and possible mechanisms of osteoarthritic degeneration over time in Dspp+/- mice over time, condyles of Dspp+/- and WT mice were analyzed radiologically, histologically, and immunohistochemically. RESULTS Micro-CT and histomorphometric analyses revealed that Dspp+/- and Dspp-/- mice had significantly lower subchondral bone mass, bone volume fraction, bone mineral density, and trabecular thickness compared to WT mice at 12 months. Interestingly, in contrast to Dspp-/- mice which exhibited tooth loss, Dspp+/- mice had minor tooth defects. RNA sequencing data showed that haplodeficency of DSPP affects the biological process of ossification and osteoclast differentiation. Additionally, histological analysis showed that Dspp+/- mice had condylar cartilage fissures, reduced cartilage thickness, decreased articular cell numbers and severe subchondral bone cavities, and with signs that were exaggerated with age. Radiographic data showed an increase in subchondral osteoporosis up to 18 months and osteophyte formation at 21 months. Moreover, Dspp+/- mice showed increased distribution of osteoclasts in the subchondral bone and increased expression of MMP2, IL-6, FN-1, and TLR4 in the mandibular condylar cartilage. CONCLUSIONS Dspp+/- mice exhibit TMJ OA in a time-dependent manner, with lesions in the mandibular condyle attributed to hypomineralization of subchondral bone and breakdown of the mandibular condylar cartilage, accompanied by upregulation of inflammatory markers.
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Affiliation(s)
- Qilin Liu
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Yitong Zhao
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Haibo Shi
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Danwei Xiang
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Chunye Wu
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Lina Song
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Jilin University, Changchun, China
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Ning Ma
- Department of Rheumatology, The First Hospital, Jilin University, Changchun, China.
| | - Hongchen Sun
- Department of Oral Pathology, School and Hospital of Stomatology, Jilin University, Changchun, China.
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Yuan M, Zheng X, Xue Y, He Z, Song G, Song Y. A novel DSPP frameshift mutation causing dentin dysplasia type 2 and disease management strategies. Oral Dis 2023; 29:2394-2400. [PMID: 36597617 DOI: 10.1111/odi.14494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 12/30/2022] [Indexed: 01/05/2023]
Abstract
The present study aims to investigate the mutation in a Chinese family with dentin dysplasia type II (DD-II) and to summarize mutation hotspots, clinical manifestations, and disease management strategies. Phenotype analysis, clinical intervention, mutation screening, and cosegregation analysis within the enrolled family were performed. A summary of the reported mutations in the dentin phosphoprotein (DPP) region of dentin sialophosphoprotein (DSPP) was analyzed. Pathogenicity prediction analysis of the physical properties and function of DSPP variants was performed by bioinformatic processing. Clinical management strategies are discussed. A novel pathogenic mutation (c.2035delA) in the DPP region of DSPP was identified, which was cosegregated in the family. The immature permanent teeth of patients with DD-II presented with X-shaped root canal phenotypes. Most of the identified mutations for DD-II were clustered in the DPP region between nucleotides 1686-2134. Points of differential diagnosis, clinical interventions, and management strategies are proposed. This study revealed a novel DSPP frameshift mutation and presented new clinical features of DD-II. The locus involving nucleotides 1686-2134 of DSPP may represent a mutational hotspot for the disease. Appropriate management of DD-II at different stages is important to avoid the development of secondary dental lesions.
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Affiliation(s)
- Minyan Yuan
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Xueqing Zheng
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yifan Xue
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Zhenru He
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Guangtai Song
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yaling Song
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
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Li M, Wang Y, Xue J, Xu Q, Zhang Y, Liu J, Xu H, Guan Z, Bian C, Zhang G, Yu Y. Baicalin can enhance odonto/osteogenic differentiation of inflammatory dental pulp stem cells by inhibiting the NF-κB and β-catenin/Wnt signaling pathways. Mol Biol Rep 2023; 50:4435-4446. [PMID: 37009956 PMCID: PMC10068215 DOI: 10.1007/s11033-023-08398-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Accepted: 03/21/2023] [Indexed: 04/04/2023]
Abstract
BACKGROUND Scutellaria baicalensis Georgi is a famous traditional Chinese medicine, which is widely used in treating fever, upper respiratory tract infection and other diseases. Pharmacology study showed it can exhibit anti-bacterial, anti-inflammation and analgesic effects. In this study, we investigated the effect of baicalin on the odonto/osteogenic differentiation of inflammatory dental pulp stem cells (iDPSCs). METHODS AND RESULTS iDPSCs were isolated from the inflamed pulps collected from pulpitis. The proliferation of iDPSCs was detected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2,5-tetrazolium bromide (MTT) assay and flow cytometry. Alkaline phosphatase (ALP) activity assay, alizarin red staining, Real-time reverse transcription-polymerase chain reaction (RT-PCR) and Western blot assay were conducted to examine the differentiation potency along with the involvement of nuclear factor kappa B(NF-κB) and β-catenin/Wnt signaling pathway. MTT assay and cell-cycle analysis demonstrated that baicalin had no influence on the proliferation of iDPSCs. ALP activity assay and alizarin red staining demonstrated that baicalin could obviously enhance ALP activity and calcified nodules formed in iDPSCs. RT-PCR and Western blot showed that the odonto/osteogenic markers were upregulated in baicalin-treated iDPSCs. Moreover, expression of cytoplastic phosphor-P65, nuclear P65, and β-catenin in iDPSCs was significantly increased compared with DPSCs, but the expression in baicalin-treated iDPSCs was inhibited. In addition, 20 µM Baicalin could accelerate odonto/osteogenic differentiation of iDPSCs via inhibition of NF-κB and β-catenin/Wnt signaling pathways. CONCLUSION Baicalin can promote odonto/osteogenic differentiation of iDPSCs through inhibition of NF-κB and β-catenin/Wnt pathways, thus providing direct evidence that baicalin may be effective in repairing pulp with early irreversible pulpitis.
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Affiliation(s)
- Mengyuan Li
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Yumeng Wang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Jing Xue
- Department of Critical Care, Changsha of Traditional Chinese Medicine Hospital, Changsha, Hunan, China
| | - Qingqing Xu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Yuerong Zhang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Jie Liu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Hai Xu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of Conservative Dentistry and Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Zhuo Guan
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Chengyue Bian
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China
| | - Guangdong Zhang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China.
- Department of General Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China.
| | - Yan Yu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, 210029, Jiangsu, China.
- Department of Conservative Dentistry and Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Shang-Hai Road 1Th, Nanjing, Jiangsu, China.
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Abstract
Non-syndromic inherited defects of tooth dentin are caused by two classes of dominant negative/gain-of-function mutations in dentin sialophosphoprotein (DSPP): 5' mutations affecting an N-terminal targeting sequence and 3' mutations that shift translation into the - 1 reading frame. DSPP defects cause an overlapping spectrum of phenotypes classified as dentin dysplasia type II and dentinogenesis imperfecta types II and III. Using CRISPR/Cas9, we generated a Dspp-1fs mouse model by introducing a FLAG-tag followed by a single nucleotide deletion that translated 493 extraneous amino acids before termination. Developing incisors and/or molars from this mouse and a DsppP19L mouse were characterized by morphological assessment, bSEM, nanohardness testing, histological analysis, in situ hybridization and immunohistochemistry. DsppP19L dentin contained dentinal tubules but grew slowly and was softer and less mineralized than the wild-type. DsppP19L incisor enamel was softer than normal, while molar enamel showed reduced rod/interrod definition. Dspp-1fs dentin formation was analogous to reparative dentin: it lacked dentinal tubules, contained cellular debris, and was significantly softer and thinner than Dspp+/+ and DsppP19L dentin. The Dspp-1fs incisor enamel appeared normal and was comparable to the wild-type in hardness. We conclude that 5' and 3' Dspp mutations cause dental malformations through different pathological mechanisms and can be regarded as distinct disorders.
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Jing Z, Chen Z, Jiang Y. Effects of DSPP Gene Mutations on Periodontal Tissues. Glob Med Genet 2021; 8:90-94. [PMID: 34430959 PMCID: PMC8378919 DOI: 10.1055/s-0041-1726416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dentin sialophosphoprotein ( DSPP ) gene mutations cause autosomal dominantly inherited diseases. DSPP gene mutations lead to abnormal expression of DSPP, resulting in a series of histological, morphological, and clinical abnormalities. A large number of previous studies demonstrated that DSPP is a dentinal-specific protein, and DSPP gene mutations lead to dentin dysplasia and dentinogenesis imperfecta. Recent studies have found that DSPP is also expressed in bone, periodontal tissues, and salivary glands. DSPP is involved in the formation of the periodontium as well as tooth structures. DSPP deficient mice present furcation involvement, cementum, and alveolar bone defect. We speculate that similar periodontal damage may occur in patients with DSPP mutations. This article reviewed the effects of DSPP gene mutations on periodontal status. However, almost all of the research is about animal study, there is no evidence that DSPP mutations cause periodontium defects in patients yet. We need to conduct systematic clinical studies on DSPP mutation families in the future to elucidate the effect of DSPP gene on human periodontium.
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Affiliation(s)
- Zhaojun Jing
- Department of General Dentistry II, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, People's Republic of China
| | - Zhibin Chen
- Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, People's Republic of China
| | - Yong Jiang
- Department of General Dentistry II, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, People's Republic of China
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Ye J, Wang Y, Zhu Q, Shi H, Xiang D, Wu C, Song L, Ma N, Liu Q, Zhang W. Primary observation of the role of posttranslational modification of dentin sialophosphoprotein (DSPP) on postnatal development of mandibular condyle in mice. Arch Oral Biol 2021; 125:105086. [PMID: 33639479 DOI: 10.1016/j.archoralbio.2021.105086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 02/13/2021] [Accepted: 02/15/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVES We aimed to observe the posttranslational role of dentin sialophosphoprotein (DSPP) on postnatal development of mandibular condyle in mice. METHODS To explore the function of full-length DSPP, four groups of mice were employed: (1) wild type (WT) mice; (2)Dspp knockout (Dspp KO) mice; (3) mice expressing the normal DSPP transgene in the Dspp KO background (Dspp KO/normal Tg); (4) mice expressing the uncleavable full-length DSPP in the Dspp KO background (Dspp KO/D452A Tg). Firstly, Plain X-ray Radiography and Micro-computed Tomography were used to observe the condylar morphology changes of Dspp KO/D452A Tg mice in comparison with the other three groups. Then, Hematoxylin & eosin and toluidine blue staining were applied to uncover the histological changes of mandibular condylar cartilage (MCC) of Dspp KO/D452A Tg mice. To explore the function of the NH2-terminal fragments (i.e. DSP/DSP-PG), three groups of mice were employed: (1) WT mice; (2) Dspp KO mice; (3) mice expressing the NH2-terminal fragments of DSPP in the Dspp-null background (Dspp KO/DSP Tg). The former strategies were utilized to examine the differences of condylar morphology and histological structures changes within three groups of mice. RESULTS Transgenic full-length DSPP partially maintained mandibular condylar morphology and MCC thickness of Dspp KO mice. Transgenic DSP failed to do so, but led to smaller mandibular condyle and disordered cartilage structure. CONCLUSIONS Our observations provide insight into the role of posttranslational modification of DSPP in the postnatal development of healthy MCC and maintenance of condylar morphology.
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Affiliation(s)
- Jiapeng Ye
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Yue Wang
- Department of Oral and Maxillofacial Surgery, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, China
| | - Qinglin Zhu
- State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Stomatology, Department of Operative Dentistry and Endodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Haibo Shi
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Danwei Xiang
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Chunyue Wu
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Lina Song
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China
| | - Ning Ma
- Department of Rheumatology, The First Hospital, Jilin University, Changchun, China
| | - Qilin Liu
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun, China.
| | - Wei Zhang
- Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China.
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