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Bai Y, Zhang Q, Chen Q, Zhou Q, Zhang Y, Shi Z, Nong H, Liu M, Zeng G, Zong S. Conditional knockout of the PDK-1 gene in osteoblasts affects osteoblast differentiation and bone formation. J Cell Physiol 2020; 236:5432-5445. [PMID: 33377210 DOI: 10.1002/jcp.30249] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/04/2020] [Accepted: 12/16/2020] [Indexed: 12/22/2022]
Abstract
Osteoblasts are the main functional cells of bone formation, and they are responsible for the synthesis, secretion, and mineralization of the bone matrix. Phosphatidylinositol-3-kinase/Akt is an important signaling pathway involved in the regulation of cell proliferation, death, and survival. Some studies have shown that 3-phosphoinositide-dependent protein kinase-1 (PDK-1) plays an important role in the phosphorylation of Akt. In the present study, an osteocalcin (OCN) promoter-driven Cre-LoxP system was established to specifically delete the PDK-1 gene in osteoblasts. It was found that the size and weight of PDK-1 conditional gene knockout (cKO) mice were significantly reduced. von Kossa staining and microcomputed tomography showed that the trabecular thickness, trabecular number, and bone volume were significantly decreased, whereas trabecular separation was increased, as compared with wide-type littermates, which were characterized by a decreased bone mass. A model of distal femoral defect was established, and it was found that cKO mice delayed bone defect repair. In osteoblasts derived from PDK-1 cKO mice, the alkaline phosphatase (ALP) secretion and ability of calcium mineralization were significantly decreased, and the expressions of osteoblast-related proteins, runt-related transcription factor 2, OCN, and ALP were also clearly decreased. Moreover, the phosphorylation level of Akt and downstream factor GSK3β and their response to insulin-like growth factor-1 (IGF-1) decreased clearly. Therefore, we believe that PDK-1 plays a very important role in osteoblast differentiation and bone formation by regulating the PDK-1/Akt/GSK3β signaling pathway.
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Affiliation(s)
- Yiguang Bai
- Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China.,Department of Orthopaedics, Nanchong Central Hospital, The Second Clinical Institute of North Sichuan Medical College, Nanchong, Sichuan, China
| | - Qiong Zhang
- Department of Nutrition and Food Hygiene, College of Public Hygiene of Guangxi Medical University, Nanning, Guangxi, China
| | - Qiaoling Chen
- Department of Oncology, Nanchong Central Hospital, The Second Clinical Institute of North Sichuan Medical College, Nanchong, Sichuan, China
| | - Quan Zhou
- Collaborative Innovation Center of Guangxi Biological Medicine, Guangxi Medical University, Nanning, Guangxi, China.,Department of Emergency, The Hongqi Hospital Affiliated to Mudanjiang Medical University, Mudanjiang, Heilongjiang, China
| | - Yanan Zhang
- Collaborative Innovation Center of Guangxi Biological Medicine, Guangxi Medical University, Nanning, Guangxi, China
| | - Zhuohua Shi
- Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Haibin Nong
- Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Mingfu Liu
- Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
| | - Gaofeng Zeng
- Department of Nutrition and Food Hygiene, College of Public Hygiene of Guangxi Medical University, Nanning, Guangxi, China
| | - Shaohui Zong
- Department of Spine Osteopathia, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China.,Research Centre for Regenerative Medicine and Guangxi Key Laboratory of Regenerative Medicine, Guangxi Medical University, Nanning, Guangxi, China
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Liu H, Du Y, St-Pierre JP, Bergholt MS, Autefage H, Wang J, Cai M, Yang G, Stevens MM, Zhang S. Bioenergetic-active materials enhance tissue regeneration by modulating cellular metabolic state. Sci Adv 2020; 6:eaay7608. [PMID: 32232154 PMCID: PMC7096169 DOI: 10.1126/sciadv.aay7608] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 01/03/2020] [Indexed: 05/02/2023]
Abstract
Cellular bioenergetics (CBE) plays a critical role in tissue regeneration. Physiologically, an enhanced metabolic state facilitates anabolic biosynthesis and mitosis to accelerate regeneration. However, the development of approaches to reprogram CBE, toward the treatment of substantial tissue injuries, has been limited thus far. Here, we show that induced repair in a rabbit model of weight-bearing bone defects is greatly enhanced using a bioenergetic-active material (BAM) scaffold compared to commercialized poly(lactic acid) and calcium phosphate ceramic scaffolds. This material was composed of energy-active units that can be released in a sustained degradation-mediated fashion once implanted. By establishing an intramitochondrial metabolic bypass, the internalized energy-active units significantly elevate mitochondrial membrane potential (ΔΨm) to supply increased bioenergetic levels and accelerate bone formation. The ready-to-use material developed here represents a highly efficient and easy-to-implement therapeutic approach toward tissue regeneration, with promise for bench-to-bedside translation.
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Affiliation(s)
- Haoming Liu
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yingying Du
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jean-Philippe St-Pierre
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Mads S. Bergholt
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
| | - Hélène Autefage
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Division of Biomaterials, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Jianglin Wang
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Mingle Cai
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Gaojie Yang
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Molly M. Stevens
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Corresponding author. (M.M.S.); (S.Z.)
| | - Shengmin Zhang
- Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
- Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China
- Corresponding author. (M.M.S.); (S.Z.)
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Boughner JC. Making Space for Permanent Molars in Growing Baboon (Papio anubis) and Great Ape (Pan paniscus and P. troglodytes) Mandibles: Possible Ontogenetic Strategies and Solutions. Anat Res Int 2011; 2011:484607. [PMID: 22567294 PMCID: PMC3335705 DOI: 10.1155/2011/484607] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Accepted: 03/02/2011] [Indexed: 11/17/2022]
Abstract
While mandible proportions do not appear to constrain permanent molar initiation times, how adequate space is created in the corpus for these teeth in a timely way is not well understood. This question is important for explaining how primate tooth and jaw development and evolution are coordinated. Landmark and linear measurement data were used to characterize mandible shape, growth trajectory, and growth rate between two genera, Papio and Pan, with contrasting permanent molar initiation schedules and mandible proportions. 3D geometric morphometric and 2D bivariate analyses showed genus-level differences in mandible morphology from birth that were amplified by different postnatal growth trajectories. Different corpus proportions and regional variation in corpus growth rates helped create space in a timely way for the molars. Regional corpus growth rates may evolve alongside permanent molar morphology and developmental timing to modify space available in the corpus for these teeth.
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Affiliation(s)
- Julia C. Boughner
- Department of Anatomy and Cell Biology, University of Saskatchewan, Health Sciences Building B328, 107 Wiggins Road, Saskatoon, SK, Canada S7K 5E5
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Bradaschia-Correa V, Massa LF, Arana-Chavez VE. Effects of alendronate on tooth eruption and molar root formation in young growing rats. Cell Tissue Res 2007; 330:475-85. [PMID: 17901984 DOI: 10.1007/s00441-007-0499-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2007] [Accepted: 08/28/2007] [Indexed: 10/22/2022]
Abstract
Tooth eruption consists of the movement of teeth from the bony crypt in which they initiate their development to the occlusal plane in the oral cavity. Interactions between the tooth germ and its surrounding alveolar bone occur in order to offer spatial conditions for its development and eruption. This involves bone remodeling during which resorption is a key event. Bisphosphonates are a group of drugs that interfere with the resorption of mineralized tissues. With the purpose of investigating the effects of sodium alendronate (a potent bisphosphonate inhibitor of osteoclast activity) on alveolar bone during tooth development and eruption, we gave newborn rats daily doses of this drug for 4, 14, and 30 days. Samples of the maxillary alveolar process containing the tooth germs were processed for light, transmission, and scanning electron microscopy and were also submitted to tartrate-resistant acid phosphatase histochemistry and high-resolution colloidal-gold immunolabeling for osteopontin. Inhibition of osteoclast activity by sodium alendronate caused the absence of tooth eruption. The lack of alveolar bone remodeling resulted in primary bone with the presence of latent osteoclasts and abundant osteopontin at the interfibrillar regions. The developing bone trabeculae invaded the dental follicle and reached the molar tooth germs, provoking deformities in enamel surfaces. No root formation was observed. These findings suggested that alendronate effectively inhibited tooth eruption by interfering with the activation of osteoclasts, which remained in a latent stage.
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Affiliation(s)
- Vivian Bradaschia-Correa
- Laboratory of Mineralized Tissue Biology, Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, 05508-900 São Paulo, Brazil
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Nemoto Y, Higuchi K, Baba O, Kudo A, Takano Y. Multinucleate osteoclasts in medaka as evidence of active bone remodeling. Bone 2007; 40:399-408. [PMID: 17049327 DOI: 10.1016/j.bone.2006.08.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2006] [Revised: 06/23/2006] [Accepted: 08/04/2006] [Indexed: 11/15/2022]
Abstract
Putative sites of bone resorption in the acellular bony skeleton of the medaka fish (Oryzias latipes) were investigated primarily by RNA in situ hybridization and histological analysis. Numerous cells that displayed intense enzymatic activity of tartrate-resistant acid phosphatase (TRAP), the main marker of osteoclasts, were distributed in the pharyngeal region of this fish. Moreover, these cells expressed cathepsin K, an osteoclast-specific gene, as well as the genes for TRAP and vacuolar-type proton ATPase (V-ATPase). Some of the TRAP-positive cells displayed all of the morphological characteristics equivalent to those of mammalian- and bird-type osteoclasts. These cells were associated primarily with the shedding teeth and their supporting bones (pedicles), where alkaline phosphatase (ALPase)-positive osteoblasts were also located, implying progressive bone remodeling associated with tooth replacement in these regions. In contrast, the inner aspects of the neural and hemal arches of the vertebral column, which were the only sites of bone resorption other than the tooth-bearing bones, showed sporadically aligned flat mononuclear TRAP-positive cells without a ruffled border, indicating a different mode of bone remodeling in these regions. These results suggest the feasibility of medaka as a model animal for the investigation of bone-related abnormalities and their genetic backgrounds.
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Affiliation(s)
- Yoshiyuki Nemoto
- Department of Biological Information, Tokyo Institute of Technology, Yokohama, Japan
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