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Kratochvilova A, Knopfova L, Gregorkova J, Gruber R, Janeckova E, Chai Y, Matalova E. FasL impacts Tgfb signaling in osteoblastic cells. Cells Dev 2024:203929. [PMID: 38810946 DOI: 10.1016/j.cdev.2024.203929] [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: 01/19/2024] [Revised: 04/26/2024] [Accepted: 05/26/2024] [Indexed: 05/31/2024]
Abstract
Fas ligand (FasL, CD178) belongs to classical apoptotic molecules, however, recent evidence expands the spectrum of FasL functions into non-apoptotic processes which also applies for the bone. Tgfb subfamily members (Tgfb1, Tgfb2, Tgfb3) represent major components in osteogenic pathways and extracellular matrix. Their possible association with FasL has not yet been investigated but can be postulated. To test such a hypothesis, FasL deficient (gld) calvaria-derived cells were examined with a focus on the expression of Tgfb receptor ligands. The qPCR analysis revealed significantly increased expression of Tgfb1, Tgfb2 and Tgfb3 in gld cells. To check the vice versa effect, the gld cells were stimulated by soluble FasL. As a consequence, a dramatic decrease in expression levels of all three ligands was observed. This phenomenon was also confirmed in IDG-SW3 (osteoblastic cells of endochondral origin). TFLink gateway identified Fosl2 as an exclusive candidate of FasL capable to impact expression of all three Tgfb ligands. However, Fosl2 siRNA did not cause any significant changes in expression of Tgfb ligands. Therefore, the upregulation of the three ligands is likely to occur separately. In this respect, we tested the only exclusive candidate transcription factor for Tgfb3, Prrx1. Additionally, an overlapping candidate for Tgfb1 and Tgfb2, Mef2c capable to modulate expression of sclerostin, was examined. Prrx1 as well as Mef2c were found upregulated in gld samples and their expression decreased after addition of FasL. The same effect of FasL treatment was observed in the IDG-SW3 model. Taken together, FasL deficiency causes an increase in the expression of Tgfb ligands and stimulation by FasL reduces Tgfb expression in osteoblastic cells. The candidates mediating the effect comprise Prrx1 for Tgfb3 and Mef2c for Tgfb1/2. These results indicate FasL as a novel cytokine interfering with Tgfb signaling and thus the complex osteogenic network. The emerging non-apoptotic functions of FasL in bone development and maintenance should also be considered in treatment strategies such as the anti-osteoporotic factor.
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Affiliation(s)
- Adela Kratochvilova
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic
| | - Lucia Knopfova
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Janka Gregorkova
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic
| | | | | | - Yang Chai
- University of Southern California, Los Angeles, USA
| | - Eva Matalova
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic; University of Veterinary Sciences, Brno, Czech Republic.
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Lin S, Tao C, Yan Q, Gao H, Qin L, Zhong Y, Yao Q, Zhang P, Yang J, Zou X, Xiao G. Pip5k1c expression in osteocytes regulates bone remodeling in mice. J Orthop Translat 2024; 45:36-47. [PMID: 38495744 PMCID: PMC10943313 DOI: 10.1016/j.jot.2023.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/22/2023] [Accepted: 10/24/2023] [Indexed: 03/19/2024] Open
Abstract
Research background The role of osteocytes in maintaining bone mass has been progressively emphasized. Pip5k1c is the most critical isoform among PIP5KIs, which can regulate cytoskeleton, biomembrane, and Ca2+ release of cells and participate in many processes, such as cell adhesion, differentiation, and apoptosis. However, its expression and function in osteocytes are still unclear. Materials and methods To determine the function of Pip5k1c in osteocytes, the expression of Pip5k1c in osteocytes was deleted by breeding the 10-kb mouse Dmp1-Cre transgenic mice with the Pip5k1cfl/fl mice. Bone histomorphometry, micro-computerized tomography analysis, immunofluorescence staining and western blotting were used to determine the effects of Pip5k1c loss on bone mass. In vitro, we explored the mechanism by siRNA knockdown of Pip5k1c in MLO-Y4 cells. Results Pip5k1c expression was decreased in osteocytes in senescent and osteoporotic tissues both in humans and mice. Loss of Pip5k1c in osteocytes led to a low bone mass in long bones and spines and impaired biomechanical properties in femur, without changes in calvariae. The loss of Pip5k1c resulted in the reduction of the protein level of type 1 collagen in tibiae and MLO-Y4 cells. Osteocyte Pip5k1c loss reduced the osteoblast and bone formation rate with high expression of sclerostin, impacting the osteoclast activities at the same time. Moreover, Pip5k1c loss in osteocytes reduced expression of focal adhesion proteins and promoted apoptosis. Conclusion Our studies demonstrate the critical role and mechanism of Pip5k1c in osteocytes in regulating bone remodeling. The translational potential of this article Osteocyte has been considered to a key role in regulating bone homeostasis. The present study has demonstrated that the significance of Pip5k1c in bone homeostasis by regulating the expression of collagen, sclerostin and focal adhesion expression, which provided a possible therapeutic target against human metabolic bone disease.
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Affiliation(s)
- Sixiong Lin
- Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Department of Spinal Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Chu Tao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Qinnan Yan
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Huanqing Gao
- State Key Laboratory of Genetic Engineering and School of Life Sciences, Fudan University, Shanghai, 200438, China
| | - Lei Qin
- Department of Orthopedics, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, 518000, China
| | - Yiming Zhong
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Qing Yao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Peijun Zhang
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
| | - Jiaming Yang
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
- Department of Orthopaedics & Traumatology, Stem Cells and Regenerative Medicine Laboratory, Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, China
| | - Xuenong Zou
- Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Department of Spinal Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510080, China
| | - Guozhi Xiao
- Department of Biochemistry, School of Medicine, Southern University of Science and Technology, Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Shenzhen, 518055, China
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Kratochvilova A, Stouracova S, Oralova V, Gruber R, Matalova E. Expression of osteogenic factors in FasL-deficient calvarial cells. Physiol Res 2023; 72:117-121. [PMID: 36545877 PMCID: PMC10069817 DOI: 10.33549/physiolres.934945] [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: 07/01/2022] [Accepted: 11/09/2022] [Indexed: 03/24/2023] Open
Abstract
During bone development, FasL acts not only through the traditional apoptotic mechanism regulating the amount of bone-resorbing osteoclasts, but there is also growing evidence about its effect on cell differentiation. Expression of osteoblastic factors was followed in non differentiated and differentiating primary calvarial cells obtained from FasL-deficient (gld) mice. The gld cells showed decreased expression of the key osteoblastic molecules osteocalcin (Ocn), osteopontin (Opn), and alkaline phosphatase (Alpl) in both groups. Notably, receptor activator of nuclear factor kappa-B ligand (Rankl) was unchanged in non-differentiated gld vs. wild type (wt) cells but decreased in differentiating gld cells. Osteoprotegerin (Opg) in the gld samples was increased in both groups. Opg vs. Rankl expression levels favored Opg in the case of non-differentiated cells but Rankl in differentiating ones. These results expand information on the involvement of FasL in non-apoptotic cell pathways related to osteoblastogenesis and consequently also osteoclastogenesis and pathologies such as osteoporosis.
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Affiliation(s)
- A Kratochvilova
- Department of Physiology, University of Veterinary Sciences, Brno, Czech Republic.
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Apaza Alccayhuaman KA, Heimel P, Lee JS, Tangl S, Kuchler U, Marchesan J, Panahipour L, Lettner S, Matalová E, Gruber R. FasL is a catabolic factor in alveolar bone homeostasis. J Clin Periodontol 2023; 50:396-405. [PMID: 36384160 PMCID: PMC10946845 DOI: 10.1111/jcpe.13750] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/20/2022] [Accepted: 11/06/2022] [Indexed: 11/18/2022]
Abstract
AIM Fas ligand (FasL) belongs to the tumour necrosis factor superfamily regulating bone turnover, inflammation, and apoptosis. The appendicular and axial skeleton phenotype of mature Faslgld mice has been reported. The impact of FasL on the alveolar bone providing support for the teeth at mature stages under healthy and induced inflammatory conditions remains unknown. MATERIALS AND METHODS We performed a phenotypical analysis of mice carrying the homozygous Faslgld mutation and wild-type (WT) mice (C57BL/6) under healthy conditions and upon ligature-induced periodontitis. After 12 days, micro-computed tomography analysis revealed the distance between the cement enamel junction and the alveolar bone crest. Additional structural parameters, such as the bone volume fraction (BV/TV) and the periodontal ligament space volume, were measured. Histological analyses were performed to visualize the catabolic changes at the defect site. RESULTS Healthy Faslgld mice were found to have more periodontal bone than their WT littermates. Faslgld had no significant effect on inflammatory osteolysis compared to WT controls with ligatures. Histology revealed eroded surfaces at the root and in the inter-proximal bone in both strains. CONCLUSIONS Our findings suggest that FasL is a catabolic factor in alveolar bone homeostasis but it does not affect the inflammatory osteolysis.
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Affiliation(s)
- Karol Alí Apaza Alccayhuaman
- Department of Oral BiologyUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Karl Donath Laboratory for Hard Tissue and Biomaterial ResearchUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
| | - Patrick Heimel
- Karl Donath Laboratory for Hard Tissue and Biomaterial ResearchUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Department for BioimagingLudwig Boltzmann Institute for Traumatology, The Research Center in Cooperation With AUVAViennaAustria
- Austrian Cluster for Tissue RegenerationViennaAustria
| | - Jung Seok Lee
- Department of Oral BiologyUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Department of PeriodontologyResearch Institute for Periodontal Regeneration, College of Dentistry, Yonsei UniversitySeoulRepublic of Korea
| | - Stefan Tangl
- Karl Donath Laboratory for Hard Tissue and Biomaterial ResearchUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Austrian Cluster for Tissue RegenerationViennaAustria
| | - Ulrike Kuchler
- Department of Oral SurgeryUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
| | - Julie Marchesan
- Division of Comprehensive Oral HealthAdams School of Dentistry, University of North Carolina at Chapel HillChapel HillNorth CarolinaUSA
| | - Layla Panahipour
- Department of Oral BiologyUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
| | - Stefan Lettner
- Karl Donath Laboratory for Hard Tissue and Biomaterial ResearchUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Austrian Cluster for Tissue RegenerationViennaAustria
| | - Eva Matalová
- Laboratory of Odontogenesis and OsteogenesisInstitute of Animal Physiology and Genetics, Czech Academy of SciencesBrnoCzech Republic
| | - Reinhard Gruber
- Department of Oral BiologyUniversity Clinic of Dentistry, Medical University of ViennaViennaAustria
- Austrian Cluster for Tissue RegenerationViennaAustria
- Department of PeriodontologySchool of Dental Medicine, University of BernBernSwitzerland
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Svandova E, Lesot H, Sharpe P, Matalova E. Making the head: Caspases in life and death. Front Cell Dev Biol 2023; 10:1075751. [PMID: 36712975 PMCID: PMC9880857 DOI: 10.3389/fcell.2022.1075751] [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: 10/20/2022] [Accepted: 12/29/2022] [Indexed: 01/14/2023] Open
Abstract
The term apoptosis, as a way of programmed cell death, was coined a half century ago and since its discovery the process has been extensively investigated. The anatomy and physiology of the head are complex and thus apoptosis has mostly been followed in separate structures, tissues or cell types. This review aims to provide a comprehensive overview of recent knowledge concerning apoptosis-related molecules involved in the development of structures of head with a particular focus on caspases, cysteine proteases having a key position in apoptotic pathways. Since many classical apoptosis-related molecules, including caspases, are emerging in several non-apoptotic processes, these were also considered. The largest organ of the head region is the brain and its development has been extensively investigated, including the roles of apoptosis and related molecules. Neurogenesis research also includes sensory organs such as the eye and ear, efferent nervous system and associated muscles and glands. Caspases have been also associated with normal function of the skin and hair follicles. Regarding mineralised tissues within craniofacial morphogenesis, apoptosis in bones has been of interest along with palate fusion and tooth development. Finally, the role of apoptosis and caspases in angiogenesis, necessary for any tissue/organ development and maintenance/homeostasis, are discussed. Additionally, this review points to abnormalities of development resulting from improper expression/activation of apoptosis-related molecules.
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Affiliation(s)
- Eva Svandova
- Faculty of Medicine, Masaryk University, Brno, Czechia,*Correspondence: Eva Svandova,
| | - Herve Lesot
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czechia
| | - Paul Sharpe
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czechia,Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral, and Craniofacial Sciences, King’s College London, London, United Kingdom
| | - Eva Matalova
- Department of Physiology, University of Veterinary Sciences, Brno, Czechia
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Chen P, Tan Z, Shek HT, Zhang JN, Zhou Y, Yin S, Dong Z, Xu J, Qiu A, Dong L, Gao B, To MKT. Phenotypic Spectrum and Molecular Basis in a Chinese Cohort of Osteogenesis Imperfecta With Mutations in Type I Collagen. Front Genet 2022; 13:816078. [PMID: 35154279 PMCID: PMC8831862 DOI: 10.3389/fgene.2022.816078] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 01/04/2022] [Indexed: 11/13/2022] Open
Abstract
Osteogenesis imperfecta (OI) is a rare inherited connective tissue dysplasia characterized with skeletal fragility, recurrent fractures and bone deformity, predominantly caused by mutations in the genes COL1A1 or COL1A2 that encode the chains of type I collagen. In the present study, clinical manifestations and genetic variants were analysed from 187 Chinese OI patients, majority of whom are of southern Chinese origin. By targeted sequencing, 63 and 58 OI patients were found carrying mutations in COL1A1 and COL1A2 respectively, including 8 novel COL1A1 and 7 novel COL1A2 variants. We validated a novel splicing mutation in COL1A1. A diverse mutational and phenotypic spectrum was observed, coupling with the heterogeneity observed in the transcriptomic data derived from osteoblasts of six patients from our cohort. Missense mutations were significantly associated (χ2p = 0.0096) with a cluster of patients with more severe clinical phenotypes. Additionally, the severity of OI was more correlated with the quality of bones, rather than the bone mineral density. Bone density is most responsive to bisphosphonate treatment during the juvenile stage (10–15 years old). In contrast, height is not responsive to bisphosphonate treatment. Our findings expand the mutational spectrum of type I collagen genes and the genotype-phenotype correlation in Chinese OI patients. The observation of effective bisphosphonate treatment in an age-specific manner may help to improve OI patient management.
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Affiliation(s)
- Peikai Chen
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Zhijia Tan
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- *Correspondence: Zhijia Tan, ; Bo Gao, ; Michael Kai Tsun To,
| | - Hiu Tung Shek
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Jia-nan Zhang
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Yapeng Zhou
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Shijie Yin
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Zhongxin Dong
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Jichun Xu
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Anmei Qiu
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Lina Dong
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
| | - Bo Gao
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- *Correspondence: Zhijia Tan, ; Bo Gao, ; Michael Kai Tsun To,
| | - Michael Kai Tsun To
- Department of Orthopaedics and Traumatology, The University of Hong Kong-Shenzhen Hospital (HKU-SZH), Shenzhen, China
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
- *Correspondence: Zhijia Tan, ; Bo Gao, ; Michael Kai Tsun To,
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