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Yu BF, Li XQ, Chen XX, Dai CC, He JG, Wei J. Analysis of the Dynamic Expression of the SMAD Family in the Periosteum During Guided Bone Regeneration. J Craniofac Surg 2024:00001665-990000000-01875. [PMID: 39221952 DOI: 10.1097/scs.0000000000010498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Accepted: 06/25/2024] [Indexed: 09/04/2024] Open
Abstract
OBJECTIVE The aim of this study was to investigate the dynamic expression of the SMAD family during guided bone regeneration for the reconstruction of cranio-maxillofacial bone defects. METHODS A swine model of guided bone regeneration was established with one side of the rib as the trauma group and the contralateral as control group. Periosteal and regenerative tissue specimens were harvested at 9 time points in the early, middle, and late phases, and were subjected to gene sequencing and tissue staining. Expression data of each SMAD family were extracted for further analysis, in which the correlation of the expression of the respective members within and between groups and at different time points was analyzed. RESULTS The expression of individual members of the SMAD family fluctuates greatly, especially during the first month. The SMAD3 and SMAD4 genes were the most highly expressed. The foldchange value of SMAD6 was the largest and remained above 1.5 throughout the process. The dynamic expression levels of SMAD2, SMAD4, SMAD5, SMAD6, and SMAD9 showed a significant positive correlation in both groups. The expression levels of each gene showed a positive correlation with other SMAD genes. Tissue staining showed that the overall contour of the regenerated bone tissue was basically formed within the first 1 month. CONCLUSION The first month of guided bone regeneration is a critical period for bone regeneration and is an important period for the SMAD family to play a role. The SMAD6 may play an important role in the whole process of guided bone regeneration.
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Affiliation(s)
- Bao-Fu Yu
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao-Qing Li
- Department of Anesthesiology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao-Xue Chen
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Chuan-Chang Dai
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jin-Guang He
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Jiao Wei
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Ding Y, Chen ZQ, Pan WF, Chen HJ, Wu M, Lyu YQ, Xie H, Huang YC, Chen ZZ, Chen F. The association and underlying mechanism of the digit ratio (2D:4D) in hypospadias. Asian J Androl 2024; 26:356-365. [PMID: 38563741 PMCID: PMC11280205 DOI: 10.4103/aja202377] [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: 07/29/2023] [Accepted: 01/14/2024] [Indexed: 04/04/2024] Open
Abstract
The second-to-fourth digit (2D:4D) ratio is thought to be associated with prenatal androgen exposure. However, the relationship between the 2D:4D ratio and hypospadias is poorly understood, and its molecular mechanism is not clear. In this study, by analyzing the hand digit length of 142 boys with hypospadias (23 distal, 68 middle, and 51 proximal) and 196 controls enrolled in Shanghai Children's Hospital (Shanghai, China) from December 2020 to December 2021, we found that the 2D:4D ratio was significantly increased in boys with hypospadias ( P < 0.001) and it was positively correlated with the severity of the hypospadias. This was further verified by the comparison of control mice and prenatal low testosterone mice model obtained by knocking out the risk gene (dynein axonemal heavy chain 8 [ DNAH8 ]) associated with hypospadias. Furthermore, the discrepancy was mainly caused by a shift in 4D. Proteomic characterization of a mouse model validated that low testosterone levels during pregnancy can impair the growth and development of 4D. Comprehensive mechanistic explorations revealed that during the androgen-sensitive window, the downregulation of the androgen receptor (AR) caused by low testosterone levels, as well as the suppressed expression of chondrocyte proliferation-related genes such as Wnt family member 5a ( Wnt5a ), Wnt5b , Smad family member 2 ( Smad2 ), and Smad3 ; mitochondrial function-related genes in cartilage such as AMP-activated protein kinase ( AMPK ) and nuclear respiratory factor 1 ( Nrf-1 ); and vascular development-related genes such as myosin light chain ( MLC ), notch receptor 3 ( Notch3 ), and sphingosine kinase 1 ( Sphk1 ), are responsible for the limitation of 4D growth, which results in a higher 2D:4D ratio in boys with hypospadias via decreased endochondral ossification. This study indicates that the ratio of 2D:4D is a risk marker of hypospadias and provides a potential molecular mechanism.
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Affiliation(s)
- Yu Ding
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Zu-Quan Chen
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Wen-Feng Pan
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Hao-Jie Chen
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Min Wu
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Yi-Qing Lyu
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Hua Xie
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Yi-Chen Huang
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Zhong-Zhong Chen
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
- Urogenital Development Research Center, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
| | - Fang Chen
- Department of Urology, Shanghai Children’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200062, China
- Clinical Research Center for Hypospadias, Pediatric College, Shanghai Jiao Tong University School of Medicine, Shanghai 200062, China
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Costantini A, Guasto A, Cormier-Daire V. TGF-β and BMP Signaling Pathways in Skeletal Dysplasia with Short and Tall Stature. Annu Rev Genomics Hum Genet 2023; 24:225-253. [PMID: 37624666 DOI: 10.1146/annurev-genom-120922-094107] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2023]
Abstract
The transforming growth factor β (TGF-β) and bone morphogenetic protein (BMP) signaling pathways play a pivotal role in bone development and skeletal health. More than 30 different types of skeletal dysplasia are now known to be caused by pathogenic variants in genes that belong to the TGF-β superfamily and/or regulate TGF-β/BMP bioavailability. This review describes the latest advances in skeletal dysplasia that is due to impaired TGF-β/BMP signaling and results in short stature (acromelic dysplasia and cardiospondylocarpofacial syndrome) or tall stature (Marfan syndrome). We thoroughly describe the clinical features of the patients, the underlying genetic findings, and the pathomolecular mechanisms leading to disease, which have been investigated mainly using patient-derived skin fibroblasts and mouse models. Although no pharmacological treatment is yet available for skeletal dysplasia due to impaired TGF-β/BMP signaling, in recent years advances in the use of drugs targeting TGF-β have been made, and we also discuss these advances.
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Affiliation(s)
- Alice Costantini
- Paris Cité University, INSERM UMR 1163, Institut Imagine, Paris, France; , ,
- Department of Molecular Medicine and Surgery and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Alessandra Guasto
- Paris Cité University, INSERM UMR 1163, Institut Imagine, Paris, France; , ,
| | - Valérie Cormier-Daire
- Paris Cité University, INSERM UMR 1163, Institut Imagine, Paris, France; , ,
- Reference Center for Skeletal Dysplasia, Hôpital Necker-Enfants Malades, Assistance Publique-Hôpitaux de Paris, Paris, France
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Liu XP, Li JQ, Li RY, Cao GL, Feng YB, Zhang W. Loss of N-acetylglucosaminyl transferase V is involved in the impaired osteogenic differentiation of bone marrow mesenchymal stem cells. Exp Anim 2023; 72:413-424. [PMID: 37019682 PMCID: PMC10435351 DOI: 10.1538/expanim.22-0129] [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: 09/20/2022] [Accepted: 03/30/2023] [Indexed: 04/07/2023] Open
Abstract
The imbalance of bone resorption and bone formation causes osteoporosis (OP), a common skeletal disorder. Decreased osteogenic activity was found in the bone marrow cultures from N-acetylglucosaminyl transferase V (MGAT5)-deficient mice. We hypothesized that MGAT5 was associated with osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) and involved in the pathological mechanisms of osteoporosis. To test this hypothesis, the mRNA and protein expression levels of MGAT5 were determined in bone tissues of ovariectomized (OVX) mice, a well-established OP model, and the role of MGAT5 in osteogenic activity was investigated in murine BMSCs. As expected, being accompanied by the loss of bone mass density and osteogenic markers (runt-related transcription factor 2, osteocalcin and osterix), a reduced expression of MGAT5 in vertebrae and femur tissues were found in OP mice. In vitro, knockdown of Mgat5 inhibited the osteogenic differentiation potential of BMSCs, as evidenced by the decreased expressions of osteogenic markers and less alkaline phosphatase and alizarin red S staining. Mechanically, knockdown of Mgat5 suppressed the nuclear translocation of β-catenin, thereby downregulating the expressions of downstream genes c-myc and axis inhibition protein 2, which were also associated with osteogenic differentiation. In addition, Mgat5 knockdown inhibited bone morphogenetic protein (BMP)/transforming growth factor (TGF)-β signaling pathway. In conclusion, MGAT5 may modulate the osteogenic differentiation of BMSCs via the β-catenin, BMP type 2 (BMP2) and TGF-β signals and involved in the process of OP.
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Affiliation(s)
- Xiao-Po Liu
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, No. 139, Ziqiang Road, Shijiazhuang 050051, Hebei, P.R. China
- Department of Orthopedics, Tangshan Gongren Hospital, No. 27, Wenhua Road, Tangshan 063000, Hebei, P.R. China
| | - Jia-Qi Li
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, No. 139, Ziqiang Road, Shijiazhuang 050051, Hebei, P.R. China
| | - Ruo-Yu Li
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, No. 139, Ziqiang Road, Shijiazhuang 050051, Hebei, P.R. China
| | - Guo-Long Cao
- Department of Orthopedics, Tangshan Gongren Hospital, No. 27, Wenhua Road, Tangshan 063000, Hebei, P.R. China
| | - Yun-Bo Feng
- Department of Orthopedics, Tangshan Gongren Hospital, No. 27, Wenhua Road, Tangshan 063000, Hebei, P.R. China
| | - Wei Zhang
- Department of Spinal Surgery, The Third Hospital of Hebei Medical University, No. 139, Ziqiang Road, Shijiazhuang 050051, Hebei, P.R. China
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Sox9-Increased miR-322-5p Facilitates BMP2-Induced Chondrogenic Differentiation by Targeting Smad7 in Mesenchymal Stem Cells. Stem Cells Int 2021; 2021:9778207. [PMID: 34777504 PMCID: PMC8589527 DOI: 10.1155/2021/9778207] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 10/22/2021] [Indexed: 12/18/2022] Open
Abstract
Bone morphogenetic protein 2 (BMP2) induces effective chondrogenesis of mesenchymal stem cells (MSCs) by promoting Sox9 expression. However, BMP2 also induces chondrocyte hypertrophy and endochondral ossification by upregulating Smad7 expression, which leads to the disruption of chondrogenesis. In addition, Smad7 can be inhibited by Sox9. Therefore, the underlying mechanism is not clear. Currently, an increasing number of studies have shown that microRNAs play a pivotal role in chondrogenic and pathophysiological processes of cartilage. The purpose of this study was to determine which microRNA is increased by Sox9 and targets Smad7, thus assisting BMP2 in maintaining stable chondrogenesis. We found that miR-322-5p meets the requirement through next-generation sequencing (NGS) and bioinformatic analysis. The targeting relationship between miR-322-5p and Smad7 was confirmed by dual-luciferase reporter assays, qPCR, and western blotting (WB). The in vitro study indicated that overexpression of miR-322-5p significantly inhibited Smad7 expression, thus causing increased chondrogenic differentiation and decreased hypertrophic differentiation, while silencing of miR-322-5p led to the opposite results. Flow cytometry (FCM) analysis indicated that overexpression of miR-322-5p significantly decreased the rate of early apoptosis in BMP2-stimulated MSCs, while silencing of miR-322-5p increased the rate. A mouse limb explant assay revealed that the expression of miR-322-5p was negatively correlated with the length of the BMP2-stimulated hypertrophic zone of the growth plate. An in vivo study also confirmed that miR-322-5p assisted BMP2 in chondrogenic differentiation. Taken together, our results suggested that Sox9-increased miR-322-5p expression can promote BMP2-induced chondrogenesis by targeting Smad7, which can be exploited for effective tissue engineering of cartilage.
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Wang L, Chang M, Tian Y, Yan J, Xu W, Yuan S, Zhang K, Liu X. The Role of Smad2 in Transforming Growth Factor β 1-Induced Hypertrophy of Ligamentum Flavum. World Neurosurg 2021; 151:e128-e136. [PMID: 33831616 DOI: 10.1016/j.wneu.2021.03.147] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 03/29/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Hypertrophy of the ligamentum flavum (LF) contributes to the development of spinal stenosis. Smad proteins can mediate the fibrogenesis activity through the transforming growth factor β1 (TGF-β1) pathway, but which Smad protein plays a more important role in the hypertrophy process of LF is unclear. METHODS The LF samples were obtained from 50 patients. After the LF cells (LFCs) were cultured, small interfering ribonucleic acid (siRNA) that target human phosphorylated-Smad2, 3, or 4 (p-Smad2,3,4) genes was transfected into LFCs. Next, proteins from cells were extracted and the protein levels of Smad2, Smad3, and Smad4 were detected by Western blot. The messenger ribonucleic acid level of TGF-β1 was measured by real-time polymerase chain reaction (PCR). Furthermore, an enzyme-linked immunosorbent assay was performed to test the impact of Smad2 downstream of the TGF-β1 signaling pathway. RESULTS Degeneration of the LF was characterized by an increase in disorganized elastic fibers and fibrotic transformation by extracellular collagen deposition. The gene expression analysis of fibrotic genes in LFCs showed that knockdown of phosphorylated-Smad2 by siRNA significantly reduced the protein expression level of TGF-β1 compared with other groups. The enzyme-linked immunosorbent assay suggested that the protein expression level of Smad2 can influence the downstream events of TGF-β1 signaling pathway in the LFCs. CONCLUSIONS Our findings suggest that Smad2 plays a potential role in the pathologic development of hypertrophy of LF. We also found that Smad2 knockdown by Smad-siRNA can influence the TGF-β1 signaling pathway through decreasing expression of TGF-β1, tumor necrosis factor α, and nuclear factor κb.
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Affiliation(s)
- Lianlei Wang
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China
| | - Mingzheng Chang
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China; Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China
| | - Yonghao Tian
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China
| | - Jun Yan
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China
| | - Wanlong Xu
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China
| | - Suomao Yuan
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China
| | - Kai Zhang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedics, Ninth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, P. R. China
| | - Xinyu Liu
- Department of Orthopedic Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, P. R. China; Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P. R. China.
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7
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Wang W, Rigueur D, Lyons KM. TGFβ as a gatekeeper of BMP action in the developing growth plate. Bone 2020; 137:115439. [PMID: 32442550 PMCID: PMC7891678 DOI: 10.1016/j.bone.2020.115439] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 05/15/2020] [Accepted: 05/17/2020] [Indexed: 02/06/2023]
Abstract
The ligands that comprise the Transforming Growth Factor β superfamily highly govern the development of the embryonic growth plate. Members of this superfamily activate canonical TGFβ and/or BMP (Bone Morphogenetic Protein) signaling pathways. How these pathways interact with one another is an area of active investigation. These two signaling pathways have been described to negatively regulate one another through crosstalk involving Smad proteins, the primary intracellular effectors of canonical signaling. More recently, a mechanism for regulation of the BMP pathway through TGFβ and BMP receptor interactions has been described. Here in this review, we demonstrate examples of how TGFβ is a gatekeeper of BMP action in the developing growth plate at both the receptor and transcriptional levels.
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Affiliation(s)
- Weiguang Wang
- Department of Orthopaedic Surgery and Orthopaedic Institute for Children, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, United States of America
| | - Diana Rigueur
- Department of Molecular, Cell and Developmental Biology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, United States of America
| | - Karen M Lyons
- Department of Orthopaedic Surgery and Orthopaedic Institute for Children, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, United States of America; Department of Molecular, Cell and Developmental Biology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, United States of America.
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8
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Ha SH, Choung PH. MSM promotes human periodontal ligament stem cells differentiation to osteoblast and bone regeneration. Biochem Biophys Res Commun 2020; 528:160-167. [PMID: 32466845 DOI: 10.1016/j.bbrc.2020.05.097] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 05/13/2020] [Indexed: 12/19/2022]
Abstract
Periodontal disease is the most common chronic disease of the oral and maxillofacial region, causing alveolar bone loss and ultimate loss of tooth. The purpose of treatment of periodontal disease is to promote the regeneration of periodontal tissue, including alveolar bone, and implantation of fixtures to replace the missing tooth as a result of advanced periodontal disease also requires alveolar bone regeneration. Methylsulfonylmethane (MSM) is a sulfur compound with well-known anti-inflammatory effects but its effects on bone regeneration are unknown. In this study, we investigated the effects of MSM on osteogenic differentiation of human PDLSCs (hPDLSCs) in vitro and in vivo. Our results demonstrate that MSM not only promotes the proliferation but also promotes osteogenic differentiation of hPDLSCs. MSM increased the expression levels of osteogenic specific markers that ALP, OPN, OCN, Runx2, and OSX. Smad2/3 signaling pathway was reinforced by MSM. Runx2, which downstream of Smad pathway, was expressed in accordance. Consistent with in vitro results, in vivo calvarial defect model and transplantation model revealed that MSM induces hPDLSCs to differentiate into osteoblast, which express ALP, OPN and OCN highly and enhance bone formation. These results suggest that MSM promotes osteogenic differentiation and bone formation of hPDLSCs, and Smad2/3 / Runx2 / OSX / OPN may play critical roles in the MSM-induced osteogenic differentiation. Thus, MSM combined with hPDLSCs may be a good candidate for future clinical applications in alveolar bone regeneration and can be used for graft material in reconstructive dentistry.
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Affiliation(s)
- Sung-Ho Ha
- Department of Oral and Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
| | - Pill-Hoon Choung
- Department of Oral and Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
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Farokhi M, Mottaghitalab F, Fatahi Y, Saeb MR, Zarrintaj P, Kundu SC, Khademhosseini A. Silk fibroin scaffolds for common cartilage injuries: Possibilities for future clinical applications. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.03.035] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10
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Aisenbrey EA, Bryant SJ. The role of chondroitin sulfate in regulating hypertrophy during MSC chondrogenesis in a cartilage mimetic hydrogel under dynamic loading. Biomaterials 2018; 190-191:51-62. [PMID: 30391802 DOI: 10.1016/j.biomaterials.2018.10.028] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/18/2018] [Accepted: 10/21/2018] [Indexed: 01/29/2023]
Abstract
Mesenchymal stem cells (MSCs) are promising for cartilage regeneration, but readily undergo terminal differentiation. The aim of this study was two-fold: a) investigate physiochemical cues from a cartilage-mimetic hydrogel under dynamic compressive loading on MSC chondrogenesis and hypertrophy and b) identify whether Smad signaling and p38 MAPK signaling mediate hypertrophy during MSC chondrogenesis. Human MSCs were encapsulated in photoclickable poly(ethylene glycol) hydrogels containing chondroitin sulfate and RGD, cultured under dynamic compressive loading or free swelling for three weeks, and evaluated by qPCR and immunohistochemistry. Loading inhibited hypertrophy in the cartilage-mimetic hydrogel indicated by a reduction in pSmad 1/5/8, Runx2, and collagen X proteins, while maintaining chondrogenesis by pSmad 2/3 and collagen II proteins. Inhibiting pSmad 1/5/8 under free swelling culture significantly reduced collagen X protein, similar to the loading condition. Chondroitin sulfate was necessary for load-inhibited hypertrophy and correlated with enhanced S100A4 expression, which is downstream of the osmotic responsive transcription factor NFAT5. Inhibiting p38 MAPK under loading reduced S100A4 expression, and upregulated Runx2 and collagen X protein. Findings from this study indicate that chondroitin sulfate with dynamic loading create physiochemical cues that support MSC chondrogenesis and attenuate hypertrophy through Smad 1/5/8 inhibition and p38 MAPK upregulation.
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Affiliation(s)
- Elizabeth A Aisenbrey
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0596, USA
| | - Stephanie J Bryant
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0596, USA; BioFrontiers Institute, University of Colorado, Boulder, CO 80309-0596, USA; Material Science and Engineering Program, University of Colorado, Boulder, CO 80309-0596, USA.
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11
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Iwasaki Y, Yamato H, Fukagawa M. TGF-Beta Signaling in Bone with Chronic Kidney Disease. Int J Mol Sci 2018; 19:E2352. [PMID: 30103389 PMCID: PMC6121599 DOI: 10.3390/ijms19082352] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 07/30/2018] [Accepted: 08/08/2018] [Indexed: 01/05/2023] Open
Abstract
Transforming growth factor (TGF)-β signaling is not only important in skeletal development, but also essential in bone remodeling in adult bone. The bone remodeling process involves integrated cell activities induced by multiple stimuli to balance bone resorption and bone formation. TGF-β plays a role in bone remodeling by coordinating cell activities to maintain bone homeostasis. However, mineral metabolism disturbance in chronic kidney disease (CKD) results in abnormal bone remodeling, which leads to ectopic calcification in CKD. High circulating levels of humoral factors such as parathyroid hormone, fibroblast growth factor 23, and Wnt inhibitors modulate bone remodeling in CKD. Several reports have revealed that TGF-β is involved in the production and functions of these factors in bone. TGF-β may act as a factor that mediates abnormal bone remodeling in CKD.
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Affiliation(s)
- Yoshiko Iwasaki
- Department of Health Sciences, Oita University of Nursing and Health Sciences, Oita 870-1163, Japan.
| | - Hideyuki Yamato
- Division of Nephrology and Metabolism, Tokai University School of Medicine, Kanagawa 259-119, Japan.
| | - Masafumi Fukagawa
- Division of Nephrology and Metabolism, Tokai University School of Medicine, Kanagawa 259-119, Japan.
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Klar RM. The Induction of Bone Formation: The Translation Enigma. Front Bioeng Biotechnol 2018; 6:74. [PMID: 29938204 PMCID: PMC6002665 DOI: 10.3389/fbioe.2018.00074] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 05/22/2018] [Indexed: 11/25/2022] Open
Abstract
A paradigmatic shift in the way of thinking is what bone tissue engineering science requires to decrypt the translation conundrum from animal models into human. The deductive work of Urist (1965), who discerned the principle of bone induction from the pioneering works of Senn, Huggins, Lacroix, Levander, and other bone regenerative scientists, provided the basis that has assisted future bone tissue regenerative scientists to extend the bone tissue engineering field and its potential uses for bone regenerative medicine in humans. However, major challenges remain that are preventing the formation of bone by induction clinically. Growing experimental evidence is indicating that bone inductive studies are non-translatable from animal models into a clinical environment. This is preventing bone tissue engineering from reaching the next phase in development. Countless studies are trying to discern how the formation of bone by induction functions mechanistically, so as to try and solve this enigmatic problem. However, are the correct questions being asked? Why do bone inductive animal studies not translate into humans? Why do bone induction principles not yield the same extent of bone formation as an autogenous bone graft? What are bone tissue engineering scientists missing? By critically re-assessing the past and present discoveries of the bone induction field, this review article attempts to re-discover the field of bone formation by induction, identifying some key features that may have been missed. These include a detailed library of all proteins in bones and their arrangement in the 3D superstructure of the bone together with some other important criteria not considered by tissue engineering scientists. The review therefore not only re-iterates possible avenues of research that need to be re-explored but also seeks to guide present and future scientists in how they assess their own research in light of experimental design and results. By addressing these issues bone formation by induction without autografts might finally become clinically viable.
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Affiliation(s)
- Roland M. Klar
- Laboratory of Biomechanics and Experimental Orthopaedics, Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Munich, Germany
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13
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Teunissen M, Riemers FM, van Leenen D, Groot Koerkamp MJA, Meij BP, Alblas J, Penning LC, Miranda‐Bedate A, Tryfonidou MA. Growth plate expression profiling: Large and small breed dogs provide new insights in endochondral bone formation. J Orthop Res 2018; 36:138-148. [PMID: 28681971 PMCID: PMC5873274 DOI: 10.1002/jor.23647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 06/21/2017] [Indexed: 02/04/2023]
Abstract
The difference in the adult height of mammals, and hence in endochondral bone formation, is not yet fully understood and may serve to identify targets for bone and cartilage regeneration. In line with this hypothesis, the intra-species disparity between the adult height of Great Danes and Miniature Poodles was investigated at a transcriptional level. Microarray analysis of the growth plate of five Great Danes and five Miniature Poodles revealed 2,981 unique genes that were differentially expressed, including many genes with an unknown role in skeletal development. A signaling pathway impact analysis indicated activation of the cell cycle, extracellular matrix receptor interaction and the tight junction pathway, and inhibition of pathways associated with inflammation and the complement cascade. In additional validation steps, the gene expression profile of the separate growth plate zones for both dog breeds were determined. Given that the BMP signaling is known for its crucial role in skeletal development and fracture healing, and BMP-2 is used in orthopaedic and spine procedures for bone augmentation, further investigations concentrated on the BMP pathway.The canonical BMP-2 and BMP-6 signaling pathway was activated in the Great Danes compared to Miniature Poodles. In conclusion, investigating the differential expression of genes involved in endochondral bone formation in small and large breed dogs, could be a game changing strategy to provide new insights in growth plate development and identify new targets for bone and cartilage regeneration. © 2017 The Authors. Journal of Orthopaedic Research® published by Wiley Periodicals, Inc. on behalf of the Orthopaedic Research Society. J Orthop Res 36:138-148, 2018.
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Affiliation(s)
- Michelle Teunissen
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
| | - Frank M. Riemers
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
| | - Dik van Leenen
- Molecular Cancer ResearchUniversity Medical Centre UtrechtUtrechtThe Netherlands
| | | | - Björn P. Meij
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
| | - Jacqueline Alblas
- Department of OrthopaedicsUniversity Medical Centre UtrechtUtrechtThe Netherlands
| | - Louis C. Penning
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
| | - Alberto Miranda‐Bedate
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
| | - Marianna A. Tryfonidou
- Faculty of Veterinary Medicine, Department of Clinical Sciences of Companion AnimalsUtrecht UniversityYalelaan 108Utrecht 3584 CMThe Netherlands
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14
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Zhao C, Jiang W, Zhou N, Liao J, Yang M, Hu N, Liang X, Xu W, Chen H, Liu W, Shi LL, Oliveira L, Wolf JM, Ho S, Athiviraham A, Tsai HM, He TC, Huang W. Sox9 augments BMP2-induced chondrogenic differentiation by downregulating Smad7 in mesenchymal stem cells (MSCs). Genes Dis 2017; 4:229-239. [PMID: 29503843 PMCID: PMC5831333 DOI: 10.1016/j.gendis.2017.10.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cartilage injuries caused by arthritis or trauma pose formidable challenges for effective clinical management due to the limited intrinsic proliferative capability of chondrocytes. Autologous stem cell-based therapies and transgene-enhanced cartilage tissue engineering may open new avenues for the treatment of cartilage injuries. Bone morphogenetic protein 2 (BMP2) induces effective chondrogenesis of mesenchymal stem cells (MSCs) and can thus be explored as a potential therapeutic agent for cartilage defect repair. However, BMP2 also induces robust endochondral ossification. Although the precise mechanisms through which BMP2 governs the divergence of chondrogenesis and osteogenesis remain to be fully understood, blocking endochondral ossification during BMP2-induced cartilage formation may have practical significance for cartilage tissue engineering. Here, we investigate the role of Sox9-donwregulated Smad7 in BMP2-induced chondrogenic differentiation of MSCs. We find that overexpression of Sox9 leads to a decrease in BMP2-induced Smad7 expression in MSCs. Sox9 inhibits BMP2-induced expression of osteopontin while enhancing the expression of chondrogenic marker Col2a1 in MSCs. Forced expression of Sox9 in MSCs promotes BMP2-induced chondrogenesis and suppresses BMP2-induced endochondral ossification. Constitutive Smad7 expression inhibits BMP2-induced chondrogenesis in stem cell implantation assay. Mouse limb explant assay reveals that Sox9 expands BMP2-stimulated chondrocyte proliferating zone while Smad7 promotes BMP2-intitated hypertrophic zone of the growth plate. Cell cycle analysis indicates that Smad7 induces significant early apoptosis in BMP2-stimulated MSCs. Taken together, our results strongly suggest that Sox9 may facilitate BMP2-induced chondrogenesis by downregulating Smad7, which can be exploited for effective cartilage tissue engineering.
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Affiliation(s)
- Chen Zhao
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.,Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Wei Jiang
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Nian Zhou
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Junyi Liao
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.,Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Mingming Yang
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Ning Hu
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Xi Liang
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Wei Xu
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Hong Chen
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Wei Liu
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China.,Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Lewis L Shi
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Leonardo Oliveira
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Jennifer Moriatis Wolf
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Sherwin Ho
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Aravind Athiviraham
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - H M Tsai
- Department of Radiology, The University of Chicago, Chicago, IL 60637, USA
| | - Tong-Chuan He
- Molecular Oncology Laboratory, Department of Orthopaedic Surgery and Rehabilitation Medicine, The University of Chicago Medical Center, Chicago, IL 60637, USA
| | - Wei Huang
- Department of Orthopedic Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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15
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Xiao D, Wang R, Hu J, Quan H. Spatial and temporal expression of Smad signaling members during the development of mandibular condylar cartilage. Exp Ther Med 2017; 14:4967-4971. [PMID: 29201201 PMCID: PMC5704254 DOI: 10.3892/etm.2017.5186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 07/14/2017] [Indexed: 02/05/2023] Open
Abstract
The present study aimed to explore the underlying developmental mechanism of mothers against decapentaplegic homolog (Smad) signaling in the development of mandibular condylar cartilage. To achieve this, the expression levels of Smad2, 3, 4 and 7, and phosphorylated Smad2/3 were investigated at different time points in developing mandibular condylar cartilage. Mandibular condyles from C57BL/6J mice were dissected at the prenatal and postnatal stages. Serial sections were made and the distributions of Smad proteins were examined using immunohistochemical techniques intermittently between day 14.5 of gestation and postnatal day 7. All Smad proteins examined in the present study were expressed in the condylar blastema and during early chondrogenesis. At the postnatal stage, Smad2 and 4 were localized in proliferative and mineralized hypertrophic chondrocytes. Smad3 and 7 were expressed in proliferative and hypertrophic chondrocytes, including pre-hypertrophic and mineralized hypertrophic chondrocytes. Later, positive immunoreactivity of Smad3 reduced at postnatal day 7. A similar expression pattern to Smad3 was observed for p-Smad2/3, but p-Smad2/3 was located in the nuclei of proliferative chondrocytes. These results suggest that Smad signaling members are involved in the development of mandibular condylar cartilage. In addition, the spatial and temporal expression of these Smads indicate that Smad signaling is involved in regulating the differentiation of chondrocytes and endochondral ossification, in order to maintain normal chondrogenesis and morphogenesis of mandibular condylar cartilage.
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Affiliation(s)
- Di Xiao
- Department of Stomatology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China
| | - Ru Wang
- Department of Stomatology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China
| | - Jing Hu
- State Key Laboratory of Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Huixin Quan
- Department of Stomatology, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116023, P.R. China
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16
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Lee JW, Iimura T. Shedding quantitative fluorescence light on novel regulatory mechanisms in skeletal biomedicine and biodentistry. JAPANESE DENTAL SCIENCE REVIEW 2017; 53:2-10. [PMID: 28408963 PMCID: PMC5390335 DOI: 10.1016/j.jdsr.2016.04.005] [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: 01/21/2016] [Revised: 04/18/2016] [Accepted: 04/27/2016] [Indexed: 10/26/2022] Open
Abstract
Digitalized fluorescence images contain numerical information such as color (wavelength), fluorescence intensity and spatial position. However, quantitative analyses of acquired data and their validation remained to be established. Our research group has applied quantitative fluorescence imaging on tissue sections and uncovered novel findings in skeletal biomedicine and biodentistry. This review paper includes a brief background of quantitative fluorescence imaging and discusses practical applications by introducing our previous research. Finally, the future perspectives of quantitative fluorescence imaging are discussed.
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Affiliation(s)
- Ji-Won Lee
- Division of Bio-Imaging, Proteo-Science Center (PROS), Ehime University, Ehime 791-0295, Japan
| | - Tadahiro Iimura
- Division of Bio-Imaging, Proteo-Science Center (PROS), Ehime University, Ehime 791-0295, Japan.,Division of Analytical Bio-Medicine, Advanced Research Support Center (ADRES), Ehime University, Ehime 791-0295, Japan.,Artificial Joint Integrated Center and Translational Research Center, Ehime University Hospital, Ehime 791-0295, Japan
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17
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Whitaker AT, Berthet E, Cantu A, Laird DJ, Alliston T. Smad4 regulates growth plate matrix production and chondrocyte polarity. Biol Open 2017; 6:358-364. [PMID: 28167493 PMCID: PMC5374397 DOI: 10.1242/bio.021436] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Smad4 is an intracellular effector of the TGFβ family that has been implicated in Myhre syndrome, a skeletal dysplasia characterized by short stature, brachydactyly and stiff joints. The TGFβ pathway also plays a critical role in the development, organization and proliferation of the growth plate, although the exact mechanisms remain unclear. Skeletal phenotypes in Myhre syndrome overlap with processes regulated by the TGFβ pathway, including organization and proliferation of the growth plate and polarity of the chondrocyte. We used in vitro and in vivo models of Smad4 deficiency in chondrocytes to test the hypothesis that deregulated TGFβ signaling leads to aberrant extracellular matrix production and loss of chondrocyte polarity. Specifically, we evaluated growth plate chondrocyte polarity in tibiae of Col2-Cre+/−;Smad4fl/fl mice and in chondrocyte pellet cultures. In vitro and in vivo, Smad4 deficiency decreased aggrecan expression and increased MMP13 expression. Smad4 deficiency disrupted the balance of cartilage matrix synthesis and degradation, even though the sequential expression of growth plate chondrocyte markers was intact. Chondrocytes in Smad4-deficient growth plates also showed evidence of polarity defects, with impaired proliferation and ability to undergo the characteristic changes in shape, size and orientation as they differentiated from resting to hypertrophic chondrocytes. Therefore, we show that Smad4 controls chondrocyte proliferation, orientation, and hypertrophy and is important in regulating the extracellular matrix composition of the growth plate. Summary: Smad4 is a key regulator of extracellular matrix production and chondrocyte proliferation, shape and orientation in the growth plate. Smad4 dysregulation results in skeletal dysplasias, such as Myhre syndrome.
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Affiliation(s)
- Amanda T Whitaker
- Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, CA 94143, USA.,Department of Orthopaedic Surgery, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Ellora Berthet
- Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, CA 94143, USA
| | - Andrea Cantu
- Department of Obstetrics, Gynecology & Reproductive Sciences, University of California San Francisco, San Francisco, CA 94143, USA.,Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California San Francisco, San Francisco, CA 94143, USA
| | - Diana J Laird
- Department of Obstetrics, Gynecology & Reproductive Sciences, University of California San Francisco, San Francisco, CA 94143, USA.,Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California San Francisco, San Francisco, CA 94143, USA
| | - Tamara Alliston
- Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, CA 94143, USA .,Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California San Francisco, San Francisco, CA 94143, USA.,Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94143, USA.,Department of Otolaryngology - Head and Neck Surgery, University of California San Francisco, San Francisco, CA 94143, USA
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18
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Wang W, Song B, Anbarchian T, Shirazyan A, Sadik JE, Lyons KM. Smad2 and Smad3 Regulate Chondrocyte Proliferation and Differentiation in the Growth Plate. PLoS Genet 2016; 12:e1006352. [PMID: 27741240 PMCID: PMC5065210 DOI: 10.1371/journal.pgen.1006352] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 09/08/2016] [Indexed: 12/30/2022] Open
Abstract
TGFβs act through canonical and non-canonical pathways, and canonical signals are transduced via Smad2 and Smad3. However, the contribution of canonical vs. non-canonical pathways in cartilage is unknown because the role of Smad2 in chondrogenesis has not been investigated in vivo. Therefore, we analyzed mice in which Smad2 is deleted in cartilage (Smad2CKO), global Smad3-/- mutants, and crosses of these strains. Growth plates at birth from all mutant strains exhibited expanded columnar and hypertrophic zones, linked to increased proliferation in resting chondrocytes. Defects were more severe in Smad2CKO and Smad2CKO;Smad3-/-(Smad2/3) mutant mice than in Smad3-/- mice, demonstrating that Smad2 plays a role in chondrogenesis. Increased levels of Ihh RNA, a key regulator of chondrocyte proliferation and differentiation, were seen in prehypertrophic chondrocytes in the three mutant strains at birth. In accordance, TGFβ treatment decreased Ihh RNA levels in primary chondrocytes from control (Smad2fx/fx) mice, but inhibition was impaired in cells from mutants. Consistent with the skeletal phenotype, the impact on TGFβ-mediated inhibition of Ihh RNA expression was more severe in Smad2CKO than in Smad3-/- cells. Putative Smad2/3 binding elements (SBEs) were identified in the proximal Ihh promoter. Mutagenesis demonstrated a role for three of them. ChIP analysis suggested that Smad2 and Smad3 have different affinities for these SBEs, and that the repressors SnoN and Ski were differentially recruited by Smad2 and Smad3, respectively. Furthermore, nuclear localization of the repressor Hdac4 was decreased in growth plates of Smad2CKO and double mutant mice. TGFβ induced association of Hdac4 with Smad2, but not with Smad3, on the Ihh promoter. Overall, these studies revealed that Smad2 plays an essential role in the development of the growth plate, that both Smads 2 and 3 inhibit Ihh expression in the neonatal growth plate, and suggested they accomplish this by binding to distinct SBEs, mediating assembly of distinct repressive complexes. The cartilage growth plate regulates the size and shape of nearly every skeletal element in the body. TGFβs are potent inducers of cartilage formation, but the mechanisms by which they transduce their signals in cartilage during development are poorly understood. Similarly, there is strong evidence that dysregulation of the TGFβ pathway increases the risk for osteoarthritis (OA) in humans, but the underlying mechanisms are unknown. TGFβs transduce their signals through a canonical pathway involving Smad2 and Smad3, and through several non-canonical pathways. However, the roles of canonical vs. noncanonical signaling are unknown in cartilage because the combined roles of Smad2 and Smad3 have not been determined. We generated mice lacking both Smad2 and Smad3 in cartilage in order to determine the role of canonical TGFβ signaling during embryonic development. We determined that Smad2 has a more prominent role than Smad3 in non-hypertrophic chondrocytes in the growth plate, and identified elevated levels of Ihh RNA in neonatal cartilage in Smad2 and Smad3 mutants. These findings may be important because Ihh is a vital regulator of cartilage proliferation and differentiation during cartilage development. More generally, the studies identify how Smad2 and Smad3 can regulate a common target gene through distinct mechanisms.
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Affiliation(s)
- Weiguang Wang
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Buer Song
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Teni Anbarchian
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Anna Shirazyan
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Joshua E. Sadik
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Karen M. Lyons
- Department of Orthopaedic Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California, United States of America
- Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, Los Angeles, California, United States of America
- * E-mail:
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19
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Wu M, Chen G, Li YP. TGF-β and BMP signaling in osteoblast, skeletal development, and bone formation, homeostasis and disease. Bone Res 2016; 4:16009. [PMID: 27563484 PMCID: PMC4985055 DOI: 10.1038/boneres.2016.9] [Citation(s) in RCA: 1026] [Impact Index Per Article: 128.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 03/04/2016] [Accepted: 03/07/2016] [Indexed: 12/11/2022] Open
Abstract
Transforming growth factor-beta (TGF-β) and bone morphogenic protein (BMP) signaling has fundamental roles in both embryonic skeletal development and postnatal bone homeostasis. TGF-βs and BMPs, acting on a tetrameric receptor complex, transduce signals to both the canonical Smad-dependent signaling pathway (that is, TGF-β/BMP ligands, receptors, and Smads) and the non-canonical-Smad-independent signaling pathway (that is, p38 mitogen-activated protein kinase/p38 MAPK) to regulate mesenchymal stem cell differentiation during skeletal development, bone formation and bone homeostasis. Both the Smad and p38 MAPK signaling pathways converge at transcription factors, for example, Runx2 to promote osteoblast differentiation and chondrocyte differentiation from mesenchymal precursor cells. TGF-β and BMP signaling is controlled by multiple factors, including the ubiquitin–proteasome system, epigenetic factors, and microRNA. Dysregulated TGF-β and BMP signaling result in a number of bone disorders in humans. Knockout or mutation of TGF-β and BMP signaling-related genes in mice leads to bone abnormalities of varying severity, which enable a better understanding of TGF-β/BMP signaling in bone and the signaling networks underlying osteoblast differentiation and bone formation. There is also crosstalk between TGF-β/BMP signaling and several critical cytokines’ signaling pathways (for example, Wnt, Hedgehog, Notch, PTHrP, and FGF) to coordinate osteogenesis, skeletal development, and bone homeostasis. This review summarizes the recent advances in our understanding of TGF-β/BMP signaling in osteoblast differentiation, chondrocyte differentiation, skeletal development, cartilage formation, bone formation, bone homeostasis, and related human bone diseases caused by the disruption of TGF-β/BMP signaling.
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Affiliation(s)
- Mengrui Wu
- Department of Pathology, University of Alabama at Birmingham , Birmingham, USA
| | - Guiqian Chen
- Department of Pathology, University of Alabama at Birmingham, Birmingham, USA; Department of neurology, Bruke Medical Research Institute, Weil Cornell Medicine of Cornell University, White Plains, USA
| | - Yi-Ping Li
- Department of Pathology, University of Alabama at Birmingham , Birmingham, USA
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20
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Bhattacharjee P, Naskar D, Maiti TK, Bhattacharya D, Kundu SC. Non-mulberry silk fibroin grafted poly (Є-caprolactone)/nano hydroxyapatite nanofibrous scaffold for dual growth factor delivery to promote bone regeneration. J Colloid Interface Sci 2016; 472:16-33. [PMID: 26998786 DOI: 10.1016/j.jcis.2016.03.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 03/09/2016] [Accepted: 03/11/2016] [Indexed: 11/18/2022]
Abstract
HYPOTHESIS This study aims at developing biodegradable, mineralized, nanofibrous scaffolds for use in bone regeneration. Scaffolds are loaded with combinations of bone morphogenic protein-2 (rhBMP-2) and transforming growth factor beta (TGF-β) and evaluated in vitro for enhancement in osteoinductivity. EXPERIMENTS Poly(Є-caprolactone) (PCL) doped with different portions of nano-hydroxyapatite is electrospun into nanofibrous scaffolds. Non-mulberry silk fibroin (NSF) obtained from Antheraea mylitta is grafted by aminolysis onto them. Scaffolds prepared have three concentrations of nano-hydroxyapatite: 0% (NSF-PCL), 25% (NSF-PCL/n25), and 50% (NSF-PCL/n50). Growth factor loading is carried out in three different combinations, solely rhBMP-2 (BN25), solely TGF-β (TN25) and rhBMP-2+TGF-β (T/B N25) via carbodiimide coupling. FINDINGS NSF-PCL/n25 showed the best results in examination of mechanical properties, bioactivity, and cell viability. Hence only NSF-PCL/n25 is selected for loading growth factors and subsequent detailed in vitro experiments using MG-63 cell-line. Both growth factors show sustain release kinetics from the matrix. The T/B N25 scaffolds support cellular activity, proliferation, and triggering of bone-associated genes' expression better and promote earlier cell differentiation. Dual growth factor loaded NSF grafted electrospun PCL/nHAp scaffolds show promise for further development into a suitable scaffold for bone tissue engineering.
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Affiliation(s)
- Promita Bhattacharjee
- Materials Science Centre, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Deboki Naskar
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Tapas K Maiti
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Debasis Bhattacharya
- Materials Science Centre, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
| | - Subhas C Kundu
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
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21
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An J, Yang H, Zhang Q, Liu C, Zhao J, Zhang L, Chen B. Natural products for treatment of osteoporosis: The effects and mechanisms on promoting osteoblast-mediated bone formation. Life Sci 2016; 147:46-58. [DOI: 10.1016/j.lfs.2016.01.024] [Citation(s) in RCA: 209] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 01/04/2016] [Accepted: 01/13/2016] [Indexed: 01/03/2023]
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22
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Ryu B, Li YX, Kang KH, Kim SK, Kim DG. Floridoside from Laurencia undulata promotes osteogenic differentiation in murine bone marrow mesenchymal cells. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.09.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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23
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Seet LF, Toh LZ, Finger SN, Chu SWL, Stefanovic B, Wong TT. Valproic acid suppresses collagen by selective regulation of Smads in conjunctival fibrosis. J Mol Med (Berl) 2015; 94:321-34. [PMID: 26507880 PMCID: PMC4803820 DOI: 10.1007/s00109-015-1358-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 09/28/2015] [Accepted: 10/20/2015] [Indexed: 04/17/2023]
Abstract
Overproduction of type I collagen is associated with a wide range of fibrotic diseases as well as surgical failure such as in glaucoma filtration surgery (GFS). Its modulation is therefore of clinical importance. Valproic acid (VPA) is known to reduce collagen in a variety of tissues with unclear mechanism of action. In this report, we demonstrate that VPA inhibited collagen production in both conjunctival fibroblasts and the mouse model of GFS. In fibroblasts, VPA decreased type I collagen expression which intensified with longer drug exposure and suppressed steady-state type I collagen promoter activity. Moreover, VPA decreased Smad2, Smad3 and Smad4 but increased Smad6 expression with a similar intensity-exposure profile. Reduction of Smad3 using small hairpin RNA and/or overexpression of Smad6 resulted in decreased collagen expression which was exacerbated when VPA was simultaneously present. Furthermore, fibrogenic TGF-β2 failed to induce collagen when VPA was present, as opposed to the myofibroblast markers, beta-actin, alpha-smooth muscle actin and tenascin-C, which were elevated by TGF-β2. VPA suppressed p3TP-Lux luciferase activity and selectively rescued Smad6 expression from suppression by TGF-β2. Notably, SMAD6 overexpression reduced the effectiveness of TGF-β2 in inducing collagen expression. In corroboration, VPA inhibited type I collagen but increased Smad6 expression in the late phase of wound healing in the mouse model of GFS. Taken together, our data indicate that VPA has the capacity to effectively suppress both steady-state and fibrogenic activation of type I collagen expression by modulating Smad expression. Hence, VPA is potentially applicable as an anti-fibrotic therapeutic by targeting collagen. Key message: • VPA modulates type I collagen expression via members of the Smad family. • VPA suppresses Smad2, Smad3 and Smad4 but upregulates Smad6. • Smad3 and Smad6 are involved in VPA regulation of steady-state collagen expression. • Smad6 is involved in VPA modulation of TGF-β-stimulated collagen expression. • VPA reduces collagen and upregulates Smad6 in the mouse model of glaucoma filtration surgery.
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Affiliation(s)
- Li-Fong Seet
- Ocular Therapeutics and Drug Delivery, Singapore Eye Research Institute, Singapore, Singapore. .,Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore. .,Duke-NUS Graduate Medical School Singapore, Singapore, Singapore.
| | - Li Zhen Toh
- Ocular Therapeutics and Drug Delivery, Singapore Eye Research Institute, Singapore, Singapore
| | - Sharon N Finger
- Ocular Therapeutics and Drug Delivery, Singapore Eye Research Institute, Singapore, Singapore
| | - Stephanie W L Chu
- Ocular Therapeutics and Drug Delivery, Singapore Eye Research Institute, Singapore, Singapore
| | - Branko Stefanovic
- Department of Biomedical Sciences, College of Medicine, Florida State University, Tallahassee, FL, USA
| | - Tina T Wong
- Ocular Therapeutics and Drug Delivery, Singapore Eye Research Institute, Singapore, Singapore. .,Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore. .,Duke-NUS Graduate Medical School Singapore, Singapore, Singapore. .,Glaucoma Service, Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore. .,School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
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24
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Shea CA, Rolfe RA, Murphy P. The importance of foetal movement for co-ordinated cartilage and bone development in utero : clinical consequences and potential for therapy. Bone Joint Res 2015; 4:105-16. [PMID: 26142413 PMCID: PMC4602203 DOI: 10.1302/2046-3758.47.2000387] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Construction of a functional skeleton is accomplished
through co-ordination of the developmental processes of chondrogenesis,
osteogenesis, and synovial joint formation. Infants whose movement in
utero is reduced or restricted and who subsequently suffer
from joint dysplasia (including joint contractures) and thin hypo-mineralised
bones, demonstrate that embryonic movement is crucial for appropriate
skeletogenesis. This has been confirmed in mouse, chick, and zebrafish
animal models, where reduced or eliminated movement consistently yields
similar malformations and which provide the possibility of experimentation
to uncover the precise disturbances and the mechanisms by which
movement impacts molecular regulation. Molecular genetic studies have
shown the important roles played by cell communication signalling
pathways, namely Wnt, Hedgehog, and transforming growth factor-beta/bone
morphogenetic protein. These pathways regulate cell behaviours such
as proliferation and differentiation to control maturation of the
skeletal elements, and are affected when movement is altered. Cell
contacts to the extra-cellular matrix as well as the cytoskeleton
offer a means of mechanotransduction which could integrate mechanical
cues with genetic regulation. Indeed, expression of cytoskeletal
genes has been shown to be affected by immobilisation. In addition
to furthering our understanding of a fundamental aspect of cell control
and differentiation during development, research in this area is
applicable to the engineering of stable skeletal tissues from stem
cells, which relies on an understanding of developmental mechanisms
including genetic and physical criteria. A deeper understanding
of how movement affects skeletogenesis therefore has broader implications
for regenerative therapeutics for injury or disease, as well as
for optimisation of physical therapy regimes for individuals affected
by skeletal abnormalities. Cite this article: Bone Joint Res 2015;4:105–116
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Affiliation(s)
- C A Shea
- Trinity College Dublin, College Green, Dublin, D2, Ireland
| | | | - P Murphy
- Trinity College Dublin, College Green, Dublin, D2, Ireland
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25
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Wang W, Rigueur D, Lyons KM. TGFβ signaling in cartilage development and maintenance. ACTA ACUST UNITED AC 2015; 102:37-51. [PMID: 24677722 DOI: 10.1002/bdrc.21058] [Citation(s) in RCA: 188] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Accepted: 01/16/2014] [Indexed: 12/18/2022]
Abstract
Members of the transforming growth factor beta (TGFβ) superfamily of secreted factors play essential roles in nearly every aspect of cartilage formation and maintenance. However, the mechanisms by which TGFβs transduce their effects in cartilage in vivo remain poorly understood. Mutations in several TGFβ family members, their receptors, extracellular modulators, and intracellular transducers have been described, and these usually impact the development of the cartilaginous skeleton. Furthermore, genome-wide association studies have linked components of the (TGFβ) superfamily to susceptibility to osteoarthritis. This review focuses on recent discoveries from genetic studies in the mouse regarding the regulation of TGFβ signaling in developing growth plate and articular cartilage, as well as the different modes of crosstalk between canonical and noncanonical TGFβ signaling. These new insights into TGFβ signaling in cartilage may open new prospects for therapies that maintain healthy articular cartilage.
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Affiliation(s)
- Weiguang Wang
- Department of Orthopaedic Surgery and Orthopaedic Institute for Children, David Geffen School of Medicine, University of California, Los Angeles, California, 90095
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26
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Transforming growth factor Beta family: insight into the role of growth factors in regulation of fracture healing biology and potential clinical applications. Mediators Inflamm 2015; 2015:137823. [PMID: 25709154 PMCID: PMC4325469 DOI: 10.1155/2015/137823] [Citation(s) in RCA: 170] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 11/09/2014] [Indexed: 01/15/2023] Open
Abstract
The transforming growth factor beta (TGF-β) family forms a group of three isoforms, TGF-β1, TGF-β2, and TGF-β3, with their structure formed by interrelated dimeric polypeptide chains. Pleiotropic and redundant functions of the TGF-β family concern control of numerous aspects and effects of cell functions, including proliferation, differentiation, and migration, in all tissues of the human body. Amongst many cytokines and growth factors, the TGF-β family is considered a group playing one of numerous key roles in control of physiological phenomena concerning maintenance of metabolic homeostasis in the bone tissue. By breaking the continuity of bone tissue, a spread-over-time and complex bone healing process is initiated, considered a recapitulation of embryonic intracartilaginous ossification. This process is a cascade of local and systemic phenomena spread over time, involving whole cell lineages and various cytokines and growth factors. Numerous in vivo and in vitro studies in various models analysing cytokines and growth factors' involvement have shown that TGF-β has a leading role in the fracture healing process. This paper sums up current knowledge on the basis of available literature concerning the role of the TGF-β family in the fracture healing process.
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27
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Hojo H, Ohba S, Chung UI. Signaling pathways regulating the specification and differentiation of the osteoblast lineage. Regen Ther 2015; 1:57-62. [PMID: 31245441 PMCID: PMC6581763 DOI: 10.1016/j.reth.2014.10.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 10/21/2014] [Accepted: 10/23/2014] [Indexed: 02/02/2023] Open
Abstract
Tissue engineering is an approach to the regeneration of tissues that uses a combination of cell sources, signaling factors and scaffolds. Among these three components, signaling factors for bone regeneration have not yet been established, and it is necessary to better understand osteoblast progenitors as a target cells. Several lines of evidence have revealed that, during bone formation, mesenchymal cells are specified and differentiate into osteoblasts through several stages of precursors. The osteoblast lineage is defined by the expression of stage-specific transcription factors. The specification and differentiation are organized by a variety of signaling pathways including hedgehog (Hh), Wnt, Notch, bone morphogenetic protein (BMP) and transforming growth factor-beta (TGFβ). In this review we integrate the known functions of these signaling pathways and discuss future tasks to gain a better understanding of the signaling network in osteogenesis for tissue engineering.
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Affiliation(s)
- Hironori Hojo
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, University of Southern California, 1425 San Pablo St, Los Angeles, CA 90089, USA
- Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Corresponding author. Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, University of Southern California, 1425 San Pablo St, Los Angeles, CA 90089, USA. Tel.: +1 323 442 8077; fax: +1 323 442 8024.
| | - Shinsuke Ohba
- Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ung-il Chung
- Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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28
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Niu YB, Kong XH, Li YH, Fan L, Pan YL, Li CR, Wu XL, Lu TL, Mei QB. Radix Dipsaci total saponins stimulate MC3T3-E1 cell differentiation via the bone morphogenetic protein-2/MAPK/Smad-dependent Runx2 pathway. Mol Med Rep 2015; 11:4468-72. [PMID: 25625570 DOI: 10.3892/mmr.2015.3249] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 12/09/2014] [Indexed: 11/06/2022] Open
Abstract
Radix Dipsaci total saponins (RTS) are primary active components of Radix Dipsaci, which is administered orally for the treatment of osteoporosis according to Chinese Medicine. RTS have also been shown to reduce the risk of bone fractures in rats. However, the detailed molecular mechanisms underlying their action remain elusive. In the present study, the ability of RTS to increase alkaline phosphatase activity, osteocalcin levels and the degree of mineralization was investigated in MC3T3‑E1 mouse osteoblast precursor cells. In addition, the associated molecular mechanism was detected. The results revealed that RTS exerted an effect on osteoblastic maturation and differentiation. Induction of differentiation by RTS was associated with an increase in the expression levels of bone morphogenetic protein‑2 (BMP‑2), phosphorylated (P)‑Smad1/5/8, P‑ERK1/2, P‑p38 and Runt‑related transcription factor 2 (Runx2). Blocking BMP‑2 expression with noggin significantly reduced the levels of osteoblastic differentiation and subsequently attenuated the expression levels of P‑Smad1/5/8, P‑ERK1/2, P‑p38 and Runx2. This indicated that RTS induced osteoblastic differentiation through BMP‑2/mitogen‑activated protein kinase/Smad1/5/8‑dependent Runx2 signaling pathways and that it may be a promising agent for enhancing bone formation.
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Affiliation(s)
- Yin-Bo Niu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Xiang-He Kong
- Graduate School of Chang'an University, Xi'an, Shaanxi 710064, P.R. China
| | - Yu-Hua Li
- Department of Pharmacology, School of Pharmacy, Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Li Fan
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Ya-Lei Pan
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Chen-Rui Li
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Xiang-Long Wu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Ting-Li Lu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
| | - Qi-Bing Mei
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P.R. China
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29
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Catherine B, Girard N, Lhuissier E, Bazille C, Boumediene K. Regulation and Role of TGFβ Signaling Pathway in Aging and Osteoarthritis Joints. Aging Dis 2014; 5:394-405. [PMID: 25489490 DOI: 10.14336/ad.2014.0500394] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 12/04/2013] [Accepted: 12/04/2013] [Indexed: 12/20/2022] Open
Abstract
Transforming growth factor beta (TGFβ) is a major signalling pathway in joints. This superfamilly is involved in numerous cellular processes in cartilage. Usually, they are considered to favor chondrocyte differentiation and cartilage repair. However, other studies show also deleterious effects of TGFβ which may induce hypertrophy. This may be explained at least in part by alteration of TGFβ signaling pathways in aging chondrocytes. This review focuses on the functions of TGFβ in joints and the regulation of its signaling mediators (receptors, Smads) during aging and osteoarthritis.
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Affiliation(s)
| | - Nicolas Girard
- Normandie Univ, France ; UNICAEN, EA4652 MILPAT, Caen, France
| | - Eva Lhuissier
- Normandie Univ, France ; UNICAEN, EA4652 MILPAT, Caen, France
| | - Celine Bazille
- Normandie Univ, France ; UNICAEN, EA4652 MILPAT, Caen, France ; Service d'Anatomie Pathologique, CHU, Caen, France
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30
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Cuellar A, Inui A, James MA, Borys D, Reddi AH. Immunohistochemical Localization of Bone Morphogenetic Proteins (BMPs) and their Receptors in Solitary and Multiple Human Osteochondromas. J Histochem Cytochem 2014; 62:488-98. [PMID: 24789804 DOI: 10.1369/0022155414535781] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 04/11/2014] [Indexed: 12/14/2022] Open
Abstract
The expression of bone morphogenetic proteins (BMPs) and their cognate receptors (BMPRs) in osteochondromas has not been investigated. We determined the immunohistochemical localization and distribution of BMP-2/4, -6 and -7; BMP receptors BMPR-1A, BMPR-1B and BMPR-2; signal transducing proteins phosphorylated Smad1/5/8; and BMP antagonist noggin in the cartilaginous cap of solitary (SO) and multiple (MO) human osteochondromas and compared these with bovine growth plate and articular cartilage. The distribution and localization patterns for BMP-6, BMP-7, BMPR-1A and BMPR-2 were similar between the cartilaginous cap and the growth plate. BMP-2/4 and BMPR-1B were present throughout the growth plate. However, BMP-2/4 and phosphorylated Smad1/5/8 were mainly detected in proliferating chondrocytes of the cartilaginous cap. Also, BMPR-1B was found in hypertrophic chondrocytes of SO and proliferating chondrocytes of MO. Noggin was observed in resting chondrocytes and, to a lesser extent, in clustered proliferating chondrocytes in SO. On the other hand, noggin in MO was observed in proliferating chondrocytes. Since BMPs can stimulate proliferation and hypertrophic differentiation of chondrocytes, these findings suggest that there is an imbalance of BMP-2/4 and noggin interactions that may lead to abnormal regulation of chondrocyte proliferation and differentiation in the cartilaginous cap of human osteochondromas.
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Affiliation(s)
- Araceli Cuellar
- Lawrence Ellison Center for Tissue Regeneration and Repair (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Orthopaedic Surgery (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Pathology (DB), University of California Davis, Sacramento, CaliforniaShriners Hospital for Children Northern California, Sacramento, California (MAJ)
| | - Atsuyuki Inui
- Lawrence Ellison Center for Tissue Regeneration and Repair (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Orthopaedic Surgery (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Pathology (DB), University of California Davis, Sacramento, CaliforniaShriners Hospital for Children Northern California, Sacramento, California (MAJ)
| | - Michelle A James
- Lawrence Ellison Center for Tissue Regeneration and Repair (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Orthopaedic Surgery (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Pathology (DB), University of California Davis, Sacramento, CaliforniaShriners Hospital for Children Northern California, Sacramento, California (MAJ)
| | - Dariusz Borys
- Lawrence Ellison Center for Tissue Regeneration and Repair (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Orthopaedic Surgery (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Pathology (DB), University of California Davis, Sacramento, CaliforniaShriners Hospital for Children Northern California, Sacramento, California (MAJ)
| | - A Hari Reddi
- Lawrence Ellison Center for Tissue Regeneration and Repair (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Orthopaedic Surgery (AC, AI, AHR), University of California Davis, Sacramento, CaliforniaDepartment of Pathology (DB), University of California Davis, Sacramento, CaliforniaShriners Hospital for Children Northern California, Sacramento, California (MAJ)
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31
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Pignatti E, Zeller R, Zuniga A. To BMP or not to BMP during vertebrate limb bud development. Semin Cell Dev Biol 2014; 32:119-27. [PMID: 24718318 DOI: 10.1016/j.semcdb.2014.04.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 04/01/2014] [Indexed: 12/01/2022]
Abstract
The analysis of vertebrate limb bud development provides insight of general relevance into the signaling networks that underlie the controlled proliferative expansion of large populations of mesenchymal progenitors, cell fate determination and initiation of differentiation. In particular, extensive genetic analysis of mouse and experimental manipulation of chicken limb bud development has revealed the self-regulatory feedback signaling systems that interlink the main morphoregulatory signaling pathways including BMPs and their antagonists. It this review, we showcase the key role of BMPs and their antagonists during limb bud development. This review provides an understanding of the key morphoregulatory interactions that underlie the highly dynamic changes in BMP activity and signal transduction as limb bud development progresses from initiation and setting-up the signaling centers to determination and formation of the chondrogenic primordia for the limb skeletal elements.
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Affiliation(s)
- Emanuele Pignatti
- Developmental Genetics, Department Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland
| | - Rolf Zeller
- Developmental Genetics, Department Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland
| | - Aimée Zuniga
- Developmental Genetics, Department Biomedicine, University of Basel, Mattenstrasse 28, CH-4058 Basel, Switzerland.
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32
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Zhou H, Zou S, Lan Y, Fei W, Jiang R, Hu J. Smad7 modulates TGFβ signaling during cranial suture development to maintain suture patency. J Bone Miner Res 2014; 29:716-24. [PMID: 23959527 DOI: 10.1002/jbmr.2066] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 06/27/2013] [Accepted: 07/29/2013] [Indexed: 02/05/2023]
Abstract
Craniosynostosis, the premature fusion of one or more sutures between the calvarial bones, is a common birth defect. Mutations in genes encoding receptors for the transforming growth factor-beta (TGFβ) family of signaling molecules have been associated with craniosynostosis, but how TGFβ signaling is regulated during suture development is not known. In the present study, we found that expression of Smad2 and Smad3, intracellular mediators of canonical TGFβ signaling, gradually increases during early postnatal suture development in rat in both the coronal suture (CS), which remains patent throughout life, and the posterior frontal suture (PFS), which undergoes programmed closure by postnatal day 22. The amounts of phosphorylated Smad2 and Smad3 proteins showed a similar gradual increase in the PFS and CS, but in the CS, Smad2/3 activation was suppressed after neonatal day 10. The suppression of Smad2/3 activation in the CS correlated with upregulation of Smad7 expression. We demonstrate that siRNA-mediated knockdown of Smad7 caused increased phosphorylation of Smad2 and Smad3 and induced osseous obliteration of the CS from postnatal days 10 to 22. The Smad7 siRNA-induced CS closure was associated with significantly increased levels of Fgf10 and phosphorylated ERK1/2 in the suture mesenchyme. Moreover, addition of the Erk1/2 inhibitor U0126 partially blocked Smad7-siRNA-induced CS closure. These findings suggest that canonical TGFβ signaling induces suture closure at least in part through activation of FGF and ERK signaling and that Smad7 plays an important role in maintaining suture patency by suppressing canonical TGFβ signaling during suture development.
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Affiliation(s)
- Hao Zhou
- State Key Laboratory of Oral Diseases and Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, Sichuan Provincial People's Hospital, Sichuan Provincial Academy of Medical Science, Chengdu, China
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33
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Handorf AM, Li WJ. Induction of mesenchymal stem cell chondrogenesis through sequential administration of growth factors within specific temporal windows. J Cell Physiol 2013; 229:162-71. [PMID: 23996894 DOI: 10.1002/jcp.24428] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 07/02/2013] [Indexed: 11/12/2022]
Abstract
Human mesenchymal stem cells (hMSCs) are capable of differentiating into chondrocyte-like cells but fail to produce the quality or quantity of cartilage matrix compared to articular chondrocytes using current differentiation protocols. In this study, we aim to improve the chondrogenic differentiation of hMSCs through the sequential administration of multiple growth factors (GFs). We began by looking at differentiating hMSCs' cell surface GF receptor expression every 3 days throughout differentiation using flow cytometry and found that not only was receptor expression dynamic throughout differentiation, but ligand sensitivity was positively correlated with receptor expression, suggesting that differentiating hMSCs may have varying GF requirements depending on their stage of differentiation. We then constructed GF sequences by administering several prochondrogenic GFs singly every 3 days throughout differentiation and assaying the expression of a variety of cartilage-related genes using qPCR. The resulting chondrocytic phenotype of sequentially induced hMSCs was then compared to that of hMSCs induced under standard culture conditions using qPCR, dimethylmethylene blue assay, and histology. We found that while the initial GF sequence was unable to improve hMSC chondrogenesis, withdrawal of GF treatment at Day 9 of differentiation in pellet culture vastly improved the success of differentiation beyond that induced by TGFβ1 alone. Additional modifications allowed us to further improve chondrogenesis to levels comparable to that obtained by co-administration of TGFβ1 and BMP7 throughout differentiation. Taken together, we demonstrated the ability to improve the chondrocytic phenotype of differentiated hMSCs through the sequential administration of multiple GFs.
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Affiliation(s)
- Andrew M Handorf
- Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, Madison, Wisconsin; Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin
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34
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Abstract
Osteoporosis is a very common skeletal disorder characterized by reduced bone mass and altered trabecular microarchitecture that leads to bone fragility and fractures. Such disease is due to alterations of the remodeling process that occurs in the basic multicellular units that are transitory cellular complexes including an osteoclastic phase (osteoclast activation and resorption of microscopic portions of bone), a reversion phase (osteoclast replacement by so-called postosteoclastic cells), and an osteoblastic phase (osteoblastic reconstruction of the resorbed bone matrix till the initial volume is regained). Bone remodeling is regulated by a number of systemic and local factors; among the former, besides physical activity and mechanical stresses, a primary role is played by hormones such as parathyroid hormone, vitamin D metabolites, estrogens, calcitonin, and glucocorticoids; among the latter, several growth factors (macrophage colony-stimulating factor, transforming growth factor β, platelet-derived growth factor, fibroblast growth factor 1, bone morphogenetic protein, and insulin-like growth factor 1), as well as the osteoprotegerin-receptor activator of nuclear factor-κ B ligand system and the sclerostin, play a primary function. The remodeling phases can be evaluated by static and dynamic histomorphometry. Their abnormalities may lead to several osteopathies, the most common of which is osteoporosis (above all senile and postmenopausal), a rather elusive disease chiefly due to its slow development. The use of animal models in its study is emphasized.
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Affiliation(s)
- Ermanno Bonucci
- Department of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
| | - Paola Ballanti
- Department of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
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35
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Yu J, Urban J. Immunolocalisation of fibrillin microfibrils in the calf metacarpal and vertebral growth plate. J Anat 2013; 223:641-50. [PMID: 24117386 DOI: 10.1111/joa.12123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2013] [Indexed: 01/19/2023] Open
Abstract
Overgrowth of limbs and spinal deformities are typical clinical manifestations of Marfan syndrome (MFS) and congenital contractural arachnodactyly (CCA), caused by mutations of the genes encoding fibrillin-1 (FBN1) and fibrillin-2 (FBN2), respectively. FBN1 mutations are also associated with acromicric (AD) and geleophysic dysplasias (GD), and with Weill-Marchesani syndrome (WMS), which is characterised by short stature. The mechanisms leading to such abnormal skeletal growth and the involvement of the fibrillins are not understood. Postnatal longitudinal bone growth mainly occurs in the epiphyseal growth plate. Here we investigated the organisation of fibrillin microfibrils in the growth plate of the long bone and vertebra immunohistochemically. Fibrillin-1 was dual-immunostained with elastin, with fibrillin-2 or with collagen X. We report that fibrillin microfibrils are distributed throughout all regions of the growth plate, and that fibrillin-1 and fibrillin-2 were differentially organised. Fibrillin-1 was more abundant in the extracellular matrix of the resting and proliferative zones of the growth plate than in the hypertrophic zone. More fibrillin-2 was found in the calcified region than in the other regions. No elastin fibres were observed in either the proliferative or hypertrophic zones. This study indicates that, as fibrillin microfibrils are involved in growth factor binding and may play a mechanical role, they could be directly involved in regulating bone growth. Hence, mutations of the fibrillins could affect their functional role in growth and lead to the growth disorders seen in patients with MFS, CCA, AD, GD and WMS.
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Affiliation(s)
- Jing Yu
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
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Si Y, Inoue K, Igarashi K, Kanno J, Imai Y. Autoimmune regulator, Aire, is a novel regulator of chondrocyte differentiation. Biochem Biophys Res Commun 2013; 437:579-84. [PMID: 23850677 DOI: 10.1016/j.bbrc.2013.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 07/01/2013] [Indexed: 01/23/2023]
Abstract
Chondrocyte differentiation is controlled by various regulators, such as Sox9 and Runx2, but the process is complex. To further understand the precise underlying molecular mechanisms of chondrocyte differentiation, we aimed to identify a novel regulatory factor of chondrocyte differentiation using gene expression profiles of micromass-cultured chondrocytes at different differentiation stages. From the results of microarray analysis, the autoimmune regulator, Aire, was identified as a novel regulator. Aire stable knockdown cells, and primary cultured chondrocytes obtained from Aire(-/-) mice, showed reduced mRNA expression levels of chondrocyte-related genes. Over-expression of Aire induced the early stages of chondrocyte differentiation by facilitating expression of Bmp2. A ChIP assay revealed that Aire was recruited on an Airebinding site (T box) in the Bmp2 promoter region in the early stages of chondrocyte differentiation and histone methylation was modified. These results suggest that Aire can facilitate early chondrocyte differentiation by expression of Bmp2 through altering the histone modification status of the promoter region of Bmp2. Taken together, Aire might play a role as an active regulator of chondrocyte differentiation, which leads to new insights into the regulatory mechanisms of chondrocyte differentiation.
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Affiliation(s)
- Yuan Si
- Laboratory of Epigenetic Skeletal Diseases, Institute of Molecular and Cellular Biosciences, The University of Tokyo, Japan
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37
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Layliev J, Sagebin F, Weinstein A, Marchac A, Szpalski C, Saadeh PB, Warren SM. Percutaneous gene therapy heals cranial defects. Gene Ther 2013; 20:922-9. [PMID: 23594990 DOI: 10.1038/gt.2013.15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 02/03/2013] [Accepted: 02/18/2013] [Indexed: 11/09/2022]
Abstract
Nonhealing bone defects are difficult to treat. As the bone morphogenic protein and transforming growth factor beta pathways have been implicated in bone healing, we hypothesized that percutaneous Smad7 silencing would enhance signaling through both pathways and improve bone formation. Critical sized parietal trephine defects were created and animals received percutaneous injection of: agarose alone or agarose containing nonsense or Smad7 small interfering RNA (siRNA). At 12 weeks, SMADs1, 2, 3, 5, 7 and 8 levels were assessed. Smad1/5/8 osteogenic target, Dlx5, and SMAD2/3 angiogenic target, plasminogen activator inhibitor-1 (Pai1), transcription levels were measured. Noncanonical signaling through TGFβ activated kinase-1 (Tak1) and target, runt-related transcription factor 2 (Runx2) and collagen1α1 (Col1α1), transcription were also measured. Micro-computed tomography and Gomori trichome staining were used to assess healing. Percutaneous injection of Smad7 siRNA significantly knocked down Smad7 mRNA (86.3 ± 2.5%) and protein levels (46.3 ± 3.1%). The SMAD7 knockdown resulted in a significant increase in receptor-regulated SMADs (R-SMAD) (Smad 1/5/8 and Smad2/3) nuclear translocation. R-SMAD nuclear translocation increased Dlx5 and Pai1 transcription. Additionally, noncanonical signaling through Tak1 increased Runx2 and Col1α1 target transcription. Compared with animals treated with agarose alone (33.9 ± 2.8% healing) and nonsense siRNA (31.5 ± 11.8% healing), animals treated Smad7 siRNA had significantly great (91.2 ± 3.8%) healing. Percutaneous Smad7 silencing increases signal transduction through canonical and noncanonical pathways resulting in significant bone formation. Minimally invasive gene therapies may prove effective in the treatment of nonhealing bone defects.
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Affiliation(s)
- J Layliev
- The Department of Plastic Surgery, Institute of Reconstructive Plastic Surgery Laboratories, New York University Medical Center, New York, NY, USA
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Makino Y, Takahashi Y, Tanabe R, Tamamura Y, Watanabe T, Haraikawa M, Hamagaki M, Hata K, Kanno J, Yoneda T, Saga Y, Goseki-Sone M, Kaneko K, Yamaguchi A, Iimura T. Spatiotemporal disorder in the axial skeleton development of the Mesp2-null mouse: a model of spondylocostal dysostosis and spondylothoracic dysostosis. Bone 2013; 53:248-58. [PMID: 23238123 DOI: 10.1016/j.bone.2012.11.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 11/01/2012] [Accepted: 11/19/2012] [Indexed: 12/18/2022]
Abstract
Spondylocostal dysostosis (SCDO) is a genetic disorder characterized by severe malformation of the axial skeleton. Mesp2 encodes a basic helix-loop-helix type transcription factor that is required for somite formation. Its human homologue, Mesp2, is a gene affected in patients with SCDO and a related vertebral disorder, spondylothoracic dysostosis (STDO). This work investigated how the loss of Mesp2 affects axial skeleton development and causes the clinical features of SCDO and STDO. We first confirmed, by three-dimensional computed tomography scanning, that Mesp2-null mice exhibited mineralized tissue patterning resembling the radiological features of SCDO and STDO. Histological observations and in situ hybridization probing for extracellular matrix molecules demonstrated that the developing vertebral bodies in Mesp2-null mice were extensively fused with rare insertions of intervertebral tissue. Unexpectedly, the intervertebral tissues were mostly fused longitudinally in the vertebral column, instead of exhibiting extended formation, as was expected based on the caudalized properties of Mesp2-null somite derivatives. Furthermore, the differentiation of vertebral body chondrocytes in Mesp2-null mice was spatially disordered and largely delayed, with an increased cell proliferation rate. The quantitative three-dimensional immunofluorescence image analyses of phospho-Smad2 and -Smad1/5/8 revealed that these chondrogenic phenotypes were associated with spatially disordered inputs of TGF-β and BMP signaling in the Mesp2-null chondrocytes, and also demonstrated an amorphous arrangement of cells with distinct properties. Furthermore, a significant delay in ossification in Mesp2-null vertebrae was observed by peripheral quantitative computed tomography. The current observations of the spatiotemporal disorder of vertebral organogenesis in the Mesp2-null mice provide further insight into the pathogenesis of SCDO and STDO, and the physiological development of the axial skeleton.
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Affiliation(s)
- Yuji Makino
- Section of Oral Pathology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan
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Zhong ZM, Li T, Xu ZX, Meng TT, Zeng JH, Zheng S, Ye WB, Wu Q, Chen JT. Effect of melatonin on the proliferation and differentiation of chondrocytes from rat vertebral body growth plate in vitro. Int J Med Sci 2013; 10:1392-8. [PMID: 23983601 PMCID: PMC3752726 DOI: 10.7150/ijms.5645] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 07/29/2013] [Indexed: 11/05/2022] Open
Abstract
PURPOSE Abnormal growth of vertebral body growth plate (VBGP) is considered as one of the etiologic factors in the adolescent idiopathic scoliosis (AIS). It was well-known that melatonin was correlated with the emergence and development of AIS. This study aimed to investigate the effect of melatonin on rat VBGP chondrocytes in vitro. METHODS Chondrocytes were isolated from rat VBGP, and treated with or without melatonin. Cell proliferation was measured by the Alamar Blue assay. Gene expression of collagen type II and aggrecan were evaluated by real-time PCR. Expression of the melatonin receptors (MT1, MT2), proliferating cell nuclear antigen (PCNA, a cell proliferation marker), Sox9 (a chondrocytic differentiation marker) and Smad4 (a common mediator in regulating the proliferation and differentiation of chondrocytes) were detected by Western blotting. RESULTS Expression of melatonin receptors (MT1, MT2) were detected in the rat VBGP chondrocytes. Melatonin, at 10 and 100 µg/mL concentration, significantly inhibited the proliferation of VBGP-chondrocytes and the gene expression of collagen type II and aggrecan, and down-regulated the protein expression of PCNA, Sox9 and Smad4. In addition, the inhibitory effect of melatonin was reversed by luzindole, a melatonin receptor antagonist. CONCLUSIONS These results suggest that melatonin at high concentrations can inhibit the proliferation and differentiation of VBGP chondrocytes, which might give some new insight into the pathogenic mechanism of AIS.
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Affiliation(s)
- Zhao-Ming Zhong
- Department of Spinal Surgery, Nanfang Hospital, Southern Medical University, China
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Dao DY, Jonason JH, Zhang Y, Hsu W, Chen D, Hilton MJ, O'Keefe RJ. Cartilage-specific β-catenin signaling regulates chondrocyte maturation, generation of ossification centers, and perichondrial bone formation during skeletal development. J Bone Miner Res 2012; 27:1680-94. [PMID: 22508079 PMCID: PMC3399946 DOI: 10.1002/jbmr.1639] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The WNT/β-catenin signaling pathway is a critical regulator of chondrocyte and osteoblast differentiation during multiple phases of cartilage and bone development. Although the importance of β-catenin signaling during the process of endochondral bone development has been previously appreciated using a variety of genetic models that manipulate β-catenin in skeletal progenitors and osteoblasts, genetic evidence demonstrating a specific role for β-catenin in committed growth-plate chondrocytes has been less robust. To identify the specific role of cartilage-derived β-catenin in regulating cartilage and bone development, we studied chondrocyte-specific gain- and loss-of-function genetic mouse models using the tamoxifen-inducible Col2Cre(ERT2) transgene in combination with β-catenin(fx(exon3)/wt) or β-catenin(fx/fx) floxed alleles, respectively. From these genetic models and biochemical data, three significant and novel findings were uncovered. First, cartilage-specific β-catenin signaling promotes chondrocyte maturation, possibly involving a bone morphogenic protein 2 (BMP2)-mediated mechanism. Second, cartilage-specific β-catenin facilitates primary and secondary ossification center formation via the induction of chondrocyte hypertrophy, possibly through enhanced matrix metalloproteinase (MMP) expression at sites of cartilage degradation, and potentially by enhancing Indian hedgehog (IHH) signaling activity to recruit vascular tissues. Finally, cartilage-specific β-catenin signaling promotes perichondrial bone formation possibly via a mechanism in which BMP2 and IHH paracrine signals synergize to accelerate perichondrial osteoblastic differentiation. The work presented here supports the concept that the cartilage-derived β-catenin signal is a central mediator for major events during endochondral bone formation, including chondrocyte maturation, primary and secondary ossification center development, vascularization, and perichondrial bone formation.
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Affiliation(s)
- Debbie Y Dao
- Department of Orthopaedics and Rehabilitation, University of Rochester Medical Center, Rochester, NY 14642, USA
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Kloen P, Lauzier D, Hamdy RC. Co-expression of BMPs and BMP-inhibitors in human fractures and non-unions. Bone 2012; 51:59-68. [PMID: 22521262 DOI: 10.1016/j.bone.2012.03.032] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/30/2012] [Accepted: 03/31/2012] [Indexed: 01/08/2023]
Abstract
Bone morphogenetic proteins (BMPs) are increasingly being used clinically to enhance fracture repair and healing of non-unions. However, the potential efficacy of supraphysiological dosing for clinical results warrants further clarification of the BMP signaling pathway in human fracture healing. As BMP signaling can be fine-tuned at numerous levels, the role of BMP-inhibitors has become a major focus. The aim of the present study was to document co-expression of BMPs, pSmad 1/5/8, and BMP-inhibitors in human fracture callus and human non-unions. Using human tissue of fracture callus (n=14) and non-unions (n=4) we documented expression of BMPs (BMP2, BMP3 and BMP7), pSmad 1/5/8 and the BMP-inhibitors noggin, gremlin, chordin, Smad-6, Smad-7 and BAMBI. Co-expression of pSmad 1/5/8, BMPs and BMP-inhibitors was noted in the osteoblasts of fracture callus as well as of non-unions. Expression of BMP-inhibitors was generally stronger in non-unions than in fracture callus. The most pertinent differences were noted in the cartilaginous tissue components. Expression of BMP2 in chondrocytes was markedly decreased in non-unions compared to fracture callus and that of BMP7 was almost completely absent. Expression of BMP-inhibitors was almost the same in osteoblasts, chondrocytes and fibroblasts of fracture callus and well as in non-unions. Interestingly, although BMP ligands were present in the chondrocytes and fibroblasts of non-unions, they did not co-express pSmad 1/5/8 suggesting that BMP signaling may have been inhibited at some point before Smad 1/5/8 phosphorylation. These results suggest co-expression of BMP, pSmad 1/5/8 and BMP-inhibitors occurs in human fracture callus as well as non-unions but the relative expression of BMPs vs. BMP-inhibitors was different between these two tissue types. In contrast to our expectations, the expression of BMP inhibitors was comparable between fracture callus and non-unions, whereas the expression of BMPs was notably lower in the cartilaginous component of the non-unions in comparison to fracture callus. Based on these results, we believe that aberrations in the BMP-signaling pathway in the cartilaginous component of fracture healing could influence clinical fracture healing. An imbalance between the local presence of BMP and BMP-inhibitors may switch the direction towards healing or non-healing of a fracture.
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Affiliation(s)
- Peter Kloen
- Department of Orthopaedic Surgery, Academic Medical Centre, Amsterdam, The Netherlands.
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Tsai SY, Huang YL, Yang WH, Tang CH. Hepatocyte growth factor-induced BMP-2 expression is mediated by c-Met receptor, FAK, JNK, Runx2, and p300 pathways in human osteoblasts. Int Immunopharmacol 2012; 13:156-62. [PMID: 22504529 DOI: 10.1016/j.intimp.2012.03.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 03/16/2012] [Accepted: 03/29/2012] [Indexed: 12/24/2022]
Abstract
Hepatocyte growth factor (HGF) has been demonstrated to stimulate osteoblast proliferation and participated bone remodeling. Bone morphogenetic protein-2 (BMP-2) is a crucial mediator in bone formation during fracture healing. However, the effects of HGF in BMP-2 expression in human osteoblasts are large unknown. Here we found that HGF induced BMP-2 expression in human osteoblasts dose-dependently. HGF-mediated BMP-2 production was attenuated by c-Met inhibitor or siRNA. Pretreatment with FAK inhibitor or JNK inhibitor (SP600125) also blocked the potentiating action of HGF. Stimulation of osteoblasts with HGF enhanced FAK phosphorylation, JNK phosphorylation, and RunX2 translocation from cytosol to the nucleus. HGF-mediated Runx2 binding to BMP-2 promoter was inhibited by c-Met inhibitor, FAK inhibitor, and SP600125. The binding of Runx2 to the BMP-2 promoter, as well as the recruitment of p300 and the enhancement of histones H3 and H4 acetylation on the BMP-2 promoter was enhanced by HGF. Our results suggest that HGF increased BMP-2 production in human osteoblasts via the c-Met receptor/FAK/JNK/Runx2 and p300 signaling pathways.
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Affiliation(s)
- Shu-Yao Tsai
- Department of Health and Nutrition Biotechnology, Asia University, Taichung, Taiwan
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Sakata-Goto T, Takahashi K, Kiso H, Huang B, Tsukamoto H, Takemoto M, Hayashi T, Sugai M, Nakamura T, Yokota Y, Shimizu A, Slavkin H, Bessho K. Id2 controls chondrogenesis acting downstream of BMP signaling during maxillary morphogenesis. Bone 2012; 50:69-78. [PMID: 21985998 DOI: 10.1016/j.bone.2011.09.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 09/03/2011] [Accepted: 09/16/2011] [Indexed: 10/17/2022]
Abstract
Maxillofacial dysmorphogenesis is found in 5% of the population. To begin to understand the mechanisms required for maxillofacial morphogenesis, we employed the inhibitors of the differentiation 2 (Id2) knock-out mouse model, in which Id proteins, members of the regulator of basic helix-loop-helix (bHLH) transcription factors, modulate cell proliferation, apoptosis, and differentiation. We now report that spatially-restricted growth defects are localized at the skull base of Id2 KO mice. Curiously, at birth, neither the mutant Id2 KO nor wild-type (WT) mice differed, based upon cephalometric and histological analyses of cranial base synchondroses. In postnatal week 2, a narrower hypertrophic zone and an inhibited proliferative zone in presphenoid synchondrosis (PSS) and spheno-occipital synchondrosis (SOS) with maxillary hypoplasia were identified in the Id2 mutant mice. Complementary studies revealed that exogenous bone morphogenetic proteins (BMPs) enhanced cartilage growth, matrix deposition, and chondrocyte proliferation in the WT but not in the mutant model. Id2-deficient chondrocytes expressed more Smad7 transcripts. Based on our results, we assert that Id2 plays an essential role, acting downstream of BMP signaling, to regulate cartilage formation at the postnatal stage by enhancing BMP signals through inhibiting Smad7 expression. As a consequence, abnormal endochondral ossification was observed in cranial base synchondroses during the postnatal growth period, resulting in the clinical phenotype of maxillofacial dysmorphogenesis.
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Affiliation(s)
- Tomoko Sakata-Goto
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University, Japan
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Shu B, Zhang M, Xie R, Wang M, Jin H, Hou W, Tang D, Harris SE, Mishina Y, O'Keefe RJ, Hilton MJ, Wang Y, Chen D. BMP2, but not BMP4, is crucial for chondrocyte proliferation and maturation during endochondral bone development. J Cell Sci 2011; 124:3428-40. [PMID: 21984813 DOI: 10.1242/jcs.083659] [Citation(s) in RCA: 180] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The BMP signaling pathway has a crucial role in chondrocyte proliferation and maturation during endochondral bone development. To investigate the specific function of the Bmp2 and Bmp4 genes in growth plate chondrocytes during cartilage development, we generated chondrocyte-specific Bmp2 and Bmp4 conditional knockout (cKO) mice and Bmp2,Bmp4 double knockout (dKO) mice. We found that deletion of Bmp2 and Bmp4 genes or the Bmp2 gene alone results in a severe chondrodysplasia phenotype, whereas deletion of the Bmp4 gene alone produces a minor cartilage phenotype. Both dKO and Bmp2 cKO mice exhibit severe disorganization of chondrocytes within the growth plate region and display profound defects in chondrocyte proliferation, differentiation and apoptosis. To understand the mechanism by which BMP2 regulates these processes, we explored the specific relationship between BMP2 and Runx2, a key regulator of chondrocyte differentiation. We found that BMP2 induces Runx2 expression at both the transcriptional and post-transcriptional levels. BMP2 enhances Runx2 protein levels through inhibition of CDK4 and subsequent prevention of Runx2 ubiquitylation and proteasomal degradation. Our studies provide novel insights into the genetic control and molecular mechanism of BMP signaling during cartilage development.
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Affiliation(s)
- Bing Shu
- Department of Orthopaedics and Rehabilitation, Center for Musculoskeletal Research, University of Rochester School of Medicine, Rochester, NY 14642, USA
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Lai CH, Chuang CC, Li JKJ, Chen SC, Chang WHS. Effects of ultrasound on osteotomy healing in a rabbit fracture model. ULTRASOUND IN MEDICINE & BIOLOGY 2011; 37:1635-1643. [PMID: 21821345 DOI: 10.1016/j.ultrasmedbio.2011.06.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 06/16/2011] [Accepted: 06/23/2011] [Indexed: 05/31/2023]
Abstract
This study investigated the effects of ultrasound (US) at different frequencies on fracture healing over a three-week period in a rabbit fibular fracture model. Forty-five adult New Zealand White rabbits were divided into five groups: a control group and four groups treated with US frequencies of 0.5, 1.0, 1.5 and 2.0 MHz (0.5 W/cm(2), 200-μs burst, pulsed 1:4). After anesthesia, transverse osteotomy was performed on the fibula bone. This was followed by intravital staining and fluorescence microscopic examination of new bone formation and biomechanical tests of torsional stiffness at the osteotomy site. Results showed that total new bone formation and torsional stiffness of the fibula were greater in all US-treated groups than in the control group. No significant difference was found between any of the four US-treated groups. The US treatment also enhanced bone growth of the sham-treated contralateral fracture site. These results suggest that US treatment at 0.5, 1.0, 1.5 or 2.0 MHz can enhance fracture healing in a rabbit model. Furthermore, the effects of US on fracture healing at present parameters might not be confined locally.
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Affiliation(s)
- Chien-Hung Lai
- Department of Physical Medicine and Rehabilitation, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
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Malicev E, Barlič A, Kregar-Velikonja N, Stražar K, Drobnič M. Cartilage from the edge of a debrided articular defect is inferior to that from a standard donor site when used for autologous chondrocyte cultivation. ACTA ACUST UNITED AC 2011; 93:421-6. [PMID: 21357969 DOI: 10.1302/0301-620x.93b3.25675] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The aim of this study was to evaluate the cultivation potential of cartilage taken from the debrided edge of a chronic lesion of the articular surface. A total of 14 patients underwent arthroscopy of the knee for a chronic lesion on the femoral condyles or trochlea. In addition to the routine cartilage biopsy, a second biopsy of cartilage was taken from the edge of the lesion. The cells isolated from both sources underwent parallel cultivation as monolayer and three-dimensional (3D) alginate culture. The cell yield, viability, capacity for proliferation, morphology and the expressions of typical cartilage genes (collagen I, COL1; collagen II, COL2; aggrecan, AGR; and versican, VER) were assessed. The cartilage differentiation indices (COL2/COL1, AGR/VER) were calculated. The control biopsies revealed a higher mean cell yield (1346 cells/mg vs 341 cells/mg), but similar cell proliferation, viability and morphology compared with the cells from the edge of the lesion. The cartilage differentiation indices were superior in control cells: COL2/COL1 (threefold in biopsies (non-significant)); sixfold in monolayer cultures (p = 0.012), and 7.5-fold in hydrogels (non-significant), AGR/VER (sevenfold in biopsies (p = 0.04), threefold (p = 0.003) in primary cultures and 3.5-fold in hydrogels (non-significant)). Our results suggest that the cultivation of chondrocytes solely from the edges of the lesion cannot be recommended for use in autologous chondrocyte implantation.
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Affiliation(s)
- E Malicev
- University Medical Centre, Ljubljana, Slovenia
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Interaction of TGFβ and BMP signaling pathways during chondrogenesis. PLoS One 2011; 6:e16421. [PMID: 21297990 PMCID: PMC3030581 DOI: 10.1371/journal.pone.0016421] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Accepted: 12/29/2010] [Indexed: 11/25/2022] Open
Abstract
TGFβ and BMP signaling pathways exhibit antagonistic activities during the development of many tissues. Although the crosstalk between BMP and TGFβ signaling pathways is well established in bone development, the relationship between these two pathways is less well defined during cartilage development and postnatal homeostasis. We generated hypomorphic mouse models of cartilage-specific loss of BMP and TGFβ signaling to assess the interaction of these pathways in postnatal growth plate homeostasis. We further used the chondrogenic ATDC5 cell line to test effects of BMP and TGFβ signaling on each other's downstream targets. We found that conditional deletion of Smad1 in chondrocytes resulted in a shortening of the growth plate. The addition of Smad5 haploinsufficiency led to a more severe phenotype with shorter prehypertrophic and hypertrophic zones and decreased chondrocyte proliferation. The opposite growth plate phenotype was observed in a transgenic mouse model of decreased chondrocytic TGFβ signaling that was generated by expressing a dominant negative form of the TGFβ receptor I (ΔTβRI) in cartilage. Histological analysis demonstrated elongated growth plates with enhanced Ihh expression, as well as an increased proliferation rate with altered production of extracellular matrix components. In contrast, in chondrogenic ATDC5 cells, TGFβ was able to enhance BMP signaling, while BMP2 significantly reduces levels of TGF signaling. In summary, our data demonstrate that during endochondral ossification, BMP and TGFβ signaling can have antagonistic effects on chondrocyte proliferation and differentiation in vivo. We also found evidence of direct interaction between the two signaling pathways in a cell model of chondrogenesis in vitro.
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Developmental mechanisms in articular cartilage degradation in osteoarthritis. ARTHRITIS 2010; 2011:683970. [PMID: 22046522 PMCID: PMC3199933 DOI: 10.1155/2011/683970] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 12/09/2010] [Indexed: 01/16/2023]
Abstract
Osteoarthritis is the most common arthritic condition, which involves progressive degeneration of articular cartilage. The most recent accomplishments have significantly advanced our understanding on the mechanisms of the disease development and progression. The most intriguing is the growing evidence indicating that extracellular matrix destruction in osteoarthritic articular cartilage resembles that in the hypertrophic zone of fetal growth plate during endochondral ossification. This suggests common regulatory mechanisms of matrix degradation in OA and in the development and can provide new approaches for the treatment of the disease by targeting reparation of chondrocyte phenotype.
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8-Prenylkaempferol accelerates osteoblast maturation through bone morphogenetic protein-2/p38 pathway to activate Runx2 transcription. Life Sci 2010; 88:335-42. [PMID: 21163272 DOI: 10.1016/j.lfs.2010.12.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 11/15/2010] [Accepted: 12/01/2010] [Indexed: 11/20/2022]
Abstract
AIMS In this study, we investigated the effect of 8-prenylkaempferol (8-PK), a prenyl-flavonoid isolated from Sophora flavescens, on osteoblast differentiation and maturation. MAIN METHODS MC3T3-E1 cells were exposed to 8-PK and the cytotoxicity was assayed. Osteoblast differentiation and maturation were evaluated by analyzing alkaline phosphatase (ALP) activity and cell mineralization, respectively. RT-PCR and Western blot were executed to determine the effects of 8-PK on osteoblast differentiation-related gene expression and signaling pathway. KEY FINDINGS 8-PK significantly promoted ALP activity, up-regulated mRNA expressions of osteocalcin, osteopontin, and type I collagen, and induced bone nodules formation. Induction of differentiation by 8-PK was associated with increased bone morphogenetic protein (BMP)-2 expression, and sequentially up-regulated the phosphorylations of Smad1/5/8 and p38, and increased the nuclear translocation of runt-related transcription factor 2 (Runx2). Addition of BMP-2 antagonist noggin blocked 8-PK and recombinant mouse BMP-2-induced ALP activity, reconfirming that BMP-2 production is required in 8-PK-mediated osteoblast differentiation. Noggin also abrogated 8-PK evoked phosphorylations of Smad1/5/8 and p38, suggesting that BMP-2 signaling is required for p38 activation in 8-PK-treated cells. Application of p38 inhibitor SB203580 repressed not only 8-PK-mediated activation of ALP, but also the nuclear translocation of Runx2 and bone nodules formation. SIGNIFICANCE The present results suggested that BMP-2/p38/Runx2 pathways were involved in 8-PK-induced differentiation/maturation of MC3T3-E1 osteoblasts and firstly demonstrated that 8-PK might be a promising agent for inducing osteogenesis.
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Hojo H, Ohba S, Yano F, Chung UI. Coordination of chondrogenesis and osteogenesis by hypertrophic chondrocytes in endochondral bone development. J Bone Miner Metab 2010; 28:489-502. [PMID: 20607327 DOI: 10.1007/s00774-010-0199-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2010] [Accepted: 05/09/2010] [Indexed: 01/01/2023]
Abstract
Mammalian bones have three distinct origins (paraxial mesoderm, lateral plate mesoderm, and neural crest) and undergo two different modes of formation (intramembranous and endochondral). Bones derived from the paraxial mesoderm and lateral plate mesoderm mainly form through the endochondral process. During this process, hypertrophic chondrocytes play a vital role in inducing osteogenesis. So far, a number of published papers have provided evidence that chondrocyte hypertrophy and osteoblast differentiation are controlled by a variety of signaling pathways and factors; however, little is known about their hierarchy (which are upstream? which are most potent?). In this review, we discuss the signaling pathways and transcriptional factors regulating chondrocyte hypertrophy and osteoblast differentiation based on the evidence that has been reported and confirmed by multiple independent groups. We then discuss which factor would provide the most coherent evidence for its role in endochondral ossification.
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Affiliation(s)
- Hironori Hojo
- Center for Disease Biology and Integrative Medicine, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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