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Suzuki S, Tanaka S, Kametani Y, Umeda A, Nishinaka K, Egawa K, Okada Y, Obana M, Fujio Y. Runx1 is upregulated by STAT3 and promotes proliferation of neonatal rat cardiomyocytes. Physiol Rep 2023; 11:e15872. [PMID: 38040660 PMCID: PMC10691971 DOI: 10.14814/phy2.15872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 12/03/2023] Open
Abstract
Though it is well known that mammalian cardiomyocytes exit cell cycle soon after birth, the mechanisms that regulate proliferation remain to be fully elucidated. Recent studies reported that cardiomyocytes undergo dedifferentiation before proliferation, indicating the importance of dedifferentiation in cardiomyocyte proliferation. Since Runx1 is expressed in dedifferentiated cardiomyocytes, Runx1 is widely used as a dedifferentiation marker of cardiomyocytes; however, little is known about the role of Runx1 in the proliferation of cardiomyocytes. The purpose of this study was to clarify the functional significance of Runx1 in cardiomyocyte proliferation. qRT-PCR analysis and immunoblot analysis demonstrated that Runx1 expression was upregulated in neonatal rat cardiomyocytes when cultured in the presence of FBS. Similarly, STAT3 was activated in the presence of FBS. Interestingly, knockdown of STAT3 significantly decreased Runx1 expression, indicating Runx1 is regulated by STAT3. We next investigated the effect of Runx1 on proliferation. Immunofluorescence microscopic analysis using an anti-Ki-67 antibody revealed that knockdown of Runx1 decreased the ratio of proliferating cardiomyocytes. Conversely, Runx1 overexpression using adenovirus vector induced cardiomyocyte proliferation in the absence of FBS. Finally, RNA-sequencing analysis revealed that Runx1 overexpression induced upregulation of cardiac fetal genes and downregulation of genes associated with fatty acid oxidation. Collectively, Runx1 is regulated by STAT3 and induces cardiomyocyte proliferation by juvenilizing cardiomyocytes.
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Affiliation(s)
- Shota Suzuki
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Shota Tanaka
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Yusuke Kametani
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Ayaka Umeda
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Kosuke Nishinaka
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Kaho Egawa
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
| | - Yoshiaki Okada
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
- Center for Infectious Disease Education and Research (CiDER)Osaka UniversitySuita CityOsakaJapan
| | - Masanori Obana
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
- Center for Infectious Disease Education and Research (CiDER)Osaka UniversitySuita CityOsakaJapan
- Integrated Frontier Research for Medical Science Division, Institute for Open and Transdisciplinary Research Initiative (OTRI)Osaka UniversitySuita CityOsakaJapan
- Global Center for Medical Engineering and Informatics (MEI)Osaka UniversitySuita CityOsakaJapan
- Radioisotope Research Center, Institute for Radiation SciencesOsaka UniversitySuita CityOsakaJapan
| | - Yasushi Fujio
- Laboratory of Clinical Science and Biomedicine, Graduate School of Pharmaceutical SciencesOsaka UniversitySuita CityOsakaJapan
- Center for Infectious Disease Education and Research (CiDER)Osaka UniversitySuita CityOsakaJapan
- Integrated Frontier Research for Medical Science Division, Institute for Open and Transdisciplinary Research Initiative (OTRI)Osaka UniversitySuita CityOsakaJapan
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2
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Hsieh TB, Jin JP. Evolution and function of calponin and transgelin. Front Cell Dev Biol 2023; 11:1206147. [PMID: 37363722 PMCID: PMC10285543 DOI: 10.3389/fcell.2023.1206147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Accepted: 05/25/2023] [Indexed: 06/28/2023] Open
Abstract
Calponin and transgelin (originally named SM22) are homologous cytoskeleton proteins that regulate actin-activated myosin motor functions in smooth muscle contraction and non-muscle cell motility during adhesion, migration, proliferation, phagocytosis, wound healing, and inflammatory responses. They are abundant cytoskeleton proteins present in multiple cell types whereas their physiological functions remain to be fully established. This focused review summarizes the evolution of genes encoding calponin and transgelin and their isoforms and discusses the structural similarity and divergence in vertebrate and invertebrate species in the context of functions in regulating cell motility. As the first literature review focusing on the evolution of the calponin-transgelin family of proteins in relevance to their structure-function relationship, the goal is to outline a foundation of current knowledge for continued investigations to understand the biological functions of calponin and transgelin in various cell types during physiological and pathological processes.
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Affiliation(s)
- Tzu-Bou Hsieh
- Department of Obstetrics and Gynecology, Wayne State University School of Medicine, Detroit, MI, United States
| | - J.-P. Jin
- Department of Physiology and Biophysics, University of Illinois at Chicago College of Medicine, Chicago, IL, United States
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3
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Shinozaki R, Eguchi R, Wakabayashi I. Experimental conditions and protein markers for redifferentiation of human coronary artery smooth muscle cells. Biomed Rep 2023; 18:24. [PMID: 36846618 PMCID: PMC9944247 DOI: 10.3892/br.2023.1606] [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: 08/30/2022] [Accepted: 01/17/2023] [Indexed: 02/15/2023] Open
Abstract
A phenotype switch from contractile type to proliferative type of arterial smooth muscle cells is known as dedifferentiation, but to the best of our knowledge, little is known about redifferentiation of coronary artery smooth muscle cells. The purpose of the present study was to determine in vitro culture conditions for inducing redifferentiation of coronary artery smooth muscle cells. In addition, the present study aimed to determine protein markers for detection of redifferentiated arterial smooth muscle cells. Human coronary artery smooth muscle cells (HCASMCs) were cultured in the presence or absence of growth factors, including epidermal growth factor, fibroblast growth factor-B and insulin. Protein expression and migration activity of HCASMCs were evaluated using western blotting and migration assay, respectively. In HCASMCs 5 days after 100% confluency, expression levels of α-smooth muscle actin (α-SMA), calponin, caldesmon and SM22α were significantly increased, while expression levels of proliferation cell nuclear antigen (PCNA) and S100A4 and migration activity were significantly decreased, compared with the corresponding levels just after reaching 100% confluency, indicating that redifferentiation occurred. Redifferentiation was also induced in a low-density culture of HCASMCs in the medium without growth factors. When the culture medium for confluent cells was replaced daily with fresh medium, the expression levels of α-SMA, caldesmon, SM22α, PCNA and S100A4 and migration activity were not significantly different but the calponin expression was significantly increased compared with the levels in dedifferentiated cells just after reaching 100% confluency. Thus, redifferentiation was induced in HCASMCs by deprivation of growth factors from culture medium. The results suggested that α-SMA, caldesmon and SM22α, but not calponin, are markers of redifferentiation of HCASMCs.
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Affiliation(s)
- Ryota Shinozaki
- Department of Environmental and Preventive Medicine, School of Medicine, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan
| | - Ryoji Eguchi
- Department of Environmental and Preventive Medicine, School of Medicine, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan,Department of Biochemistry, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan
| | - Ichiro Wakabayashi
- Department of Environmental and Preventive Medicine, School of Medicine, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan,Correspondence to: Professor Ichiro Wakabayashi, Department of Environmental and Preventive Medicine, School of Medicine, Hyogo Medical University, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan
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Zhou H, Ke J, Liu C, Zhu M, Xiao B, Wang Q, Hou R, Zheng Y, Wu Y, Zhou X, Chen X, Pan H. Potential prognostic and immunotherapeutic value of calponin 1: A pan-cancer analysis. Front Pharmacol 2023; 14:1184250. [PMID: 37153789 PMCID: PMC10160448 DOI: 10.3389/fphar.2023.1184250] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Accepted: 04/05/2023] [Indexed: 05/10/2023] Open
Abstract
Background: Emerging evidence has suggested a pro-oncogenic role of calponin 1 (CNN1) in the initiation of a variety of cancers. Despite this, CNN1 remains unknown in terms of its effects and mechanisms on angiogenesis, prognosis, and immunology in cancer. Materials and Methods: The expression of CNN1 was extracted and analyzed using the TIMER, UALCAN, and GEPIA databases. Meanwhile, we analyzed the diagnostic value of CNN1 by using PrognoScan and Kaplan-Meier plots. To elucidate the value of CNN1 in immunotherapy, we used the TIMER 2.0 database, TISIDB database, and Sangerbox database. Gene set enrichment analysis (GSEA) was used to analyze the expression pattern and bio-progression of CNN1 and the vascular endothelium growth factor (VEGF) in cancer. The expressions of CNN1 and VEGF in gastric cancer were confirmed using immunohistochemistry. We used Cox regression analysis to investigate the association between pathological characteristics, clinical prognosis, and CNN1 and VEGF expressions in patients with gastric cancer. Results: CNN1 expression was higher in normal tissues than it was in tumor tissues of most types of cancers. However, the expression level rebounds during the development of tumors. High levels of CNN1 indicate a poor prognosis for 11 tumors, which include stomach adenocarcinoma (STAD). There is a relationship between CNN1 and tumor-infiltrating lymphocytes (TILs), and the marker genes NRP1 and TNFRSF14 of TILs are significantly related to CNN1 expression in gastric cancers. The GSEA results confirmed the lower expression of CNN1 in tumors when compared to normal tissues. However, CNN1 again showed an increasing trend during tumor development. In addition, the results also suggest that CNN1 is involved in angiogenesis. The immunohistochemistry results validated the GSEA result (take gastric cancer as an example). Cox analysis suggested that high CNN1 expression and high VEGF expression are closely associated with poor clinical prognosis. Conclusion: Our study has shown that CNN1 expression is aberrantly elevated in various cancers and positively correlates with angiogenesis and the immune checkpoint, contributing to cancer progression and poor prognosis. These results suggest that CNN1 could serve as a promising candidate for pan-cancer immunotherapy.
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Affiliation(s)
- Hengli Zhou
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Junyu Ke
- School of Basic Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, China
- Gaozhou Hospital of Traditional Chinese Medicine, Gaozhou, China
| | - Changhua Liu
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Menglu Zhu
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Bijuan Xiao
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qi Wang
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Rui Hou
- Namyue Natural Medicine Co., Ltd., Macau, Macau SAR, China
| | | | - Yongqiang Wu
- Gaozhou Hospital of Traditional Chinese Medicine, Gaozhou, China
| | | | - Xinlin Chen
- School of Basic Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, China
- *Correspondence: Huafeng Pan, ; Xinlin Chen,
| | - Huafeng Pan
- Science and Technology Innovation Center, Guangzhou University of Chinese Medicine, Guangzhou, China
- Jiangsu Collaborative Innovation Center of Traditional Chinese Medicine in Prevention and Treatment of Tumor, Nanjing University of Chinese Medicine, Nanjing, China
- *Correspondence: Huafeng Pan, ; Xinlin Chen,
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Dong K, Shen J, He X, Hu G, Wang L, Osman I, Bunting KM, Dixon-Melvin R, Zheng Z, Xin H, Xiang M, Vazdarjanova A, Fulton DJR, Zhou J. CARMN Is an Evolutionarily Conserved Smooth Muscle Cell-Specific LncRNA That Maintains Contractile Phenotype by Binding Myocardin. Circulation 2021; 144:1856-1875. [PMID: 34694145 PMCID: PMC8726016 DOI: 10.1161/circulationaha.121.055949] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Vascular homeostasis is maintained by the differentiated phenotype of vascular smooth muscle cells (VSMCs). The landscape of protein coding genes comprising the transcriptome of differentiated VSMCs has been intensively investigated but many gaps remain including the emerging roles of noncoding genes. METHODS We reanalyzed large-scale, publicly available bulk and single-cell RNA sequencing datasets from multiple tissues and cell types to identify VSMC-enriched long noncoding RNAs. The in vivo expression pattern of a novel smooth muscle cell (SMC)-expressed long noncoding RNA, Carmn (cardiac mesoderm enhancer-associated noncoding RNA), was investigated using a novel Carmn green fluorescent protein knock-in reporter mouse model. Bioinformatics and quantitative real-time polymerase chain reaction analysis were used to assess CARMN expression changes during VSMC phenotypic modulation in human and murine vascular disease models. In vitro, functional assays were performed by knocking down CARMN with antisense oligonucleotides and overexpressing Carmn by adenovirus in human coronary artery SMCs. Carotid artery injury was performed in SMC-specific Carmn knockout mice to assess neointima formation and the therapeutic potential of reversing CARMN loss was tested in a rat carotid artery balloon injury model. The molecular mechanisms underlying CARMN function were investigated using RNA pull-down, RNA immunoprecipitation, and luciferase reporter assays. RESULTS We identified CARMN, which was initially annotated as the host gene of the MIR143/145 cluster and recently reported to play a role in cardiac differentiation, as a highly abundant and conserved, SMC-specific long noncoding RNA. Analysis of the Carmn GFP knock-in mouse model confirmed that Carmn is transiently expressed in embryonic cardiomyocytes and thereafter becomes restricted to SMCs. We also found that Carmn is transcribed independently of Mir143/145. CARMN expression is dramatically decreased by vascular disease in humans and murine models and regulates the contractile phenotype of VSMCs in vitro. In vivo, SMC-specific deletion of Carmn significantly exacerbated, whereas overexpression of Carmn markedly attenuated, injury-induced neointima formation in mouse and rat, respectively. Mechanistically, we found that Carmn physically binds to the key transcriptional cofactor myocardin, facilitating its activity and thereby maintaining the contractile phenotype of VSMCs. CONCLUSIONS CARMN is an evolutionarily conserved SMC-specific long noncoding RNA with a previously unappreciated role in maintaining the contractile phenotype of VSMCs and is the first noncoding RNA discovered to interact with myocardin.
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Affiliation(s)
- Kunzhe Dong
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Jian Shen
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, 310009, China
| | - Xiangqin He
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Guoqing Hu
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Liang Wang
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 330006, China
| | - Islam Osman
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Kristopher M. Bunting
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Rachael Dixon-Melvin
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Zeqi Zheng
- Department of Cardiology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, 330006, China
| | - Hongbo Xin
- The National Engineering Research Center for Bioengineering Drugs and the Technologies, Institute of Translational Medicine, Nanchang University, Nanchang, Jiangxi, 330031, China
- School of Life Sciences, Nanchang University, Nanchang, Jiangxi, 330031, China
| | - Meixiang Xiang
- Department of Cardiology, The Second Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang, 310009, China
| | - Almira Vazdarjanova
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - David J. R. Fulton
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
- Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
| | - Jiliang Zhou
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, 30912, USA
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6
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Jeong ES, Park BH, Lee S, Jang JH. Construction and Evaluation of Recombinant Chimeric Fibrillin and Elastin Fragment in Human Mesenchymal Stem Cells. Protein Pept Lett 2021; 29:176-183. [PMID: 34875983 DOI: 10.2174/0929866528666211207110043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/14/2021] [Accepted: 10/22/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Diverse extracellular matrix (ECM) proteins physically interact with stem cells and regulate stem cell function. However, the large molecular weight of the natural ECM renders large-scale fabrication of a similar functional structure challenging. OBJECTIVE The objective of this study was to construct a low molecular weight and multifunctional chimeric form of recombinant ECM to stimulate mesenchymal stem cell (MSC) for tissue repair. We engineered Fibrillin-1PF14 fused to an elastin-like polypeptide to develop a new biomimetic ECM for stem cell differentiation and investigated whether this recombinant chimeric Fibrillin-Elastin fragment (rcFE) was effective on human nasal inferior turbinate-derived mesenchymal stem cells (hTMSCs). METHODS hTMSCs were grown in the medium supplemented with rcFE, then the effect of the protein was confirmed through cell adhesion assay, proliferation assay, and real-time PCR. RESULTS rcFE enhanced the adhesion activity of hTMSCs by 2.7-fold at the optimal concentration, and the proliferation activity was 2.6-fold higher than that of the control group (non-treatment rcFE). In addition, when smooth muscle cell differentiation markers were identified by real-time PCR, Calponin increased about 6-fold, α-actin about 9-fold, and MYH11 about 10-fold compared to the control group. CONCLUSION Chimeric rcFE enhanced cellular functions such as cell adhesion, proliferation, and smooth muscle differentiation of hTMSCs, suggesting that the rcFE can facilitate the induction of tissue regeneration.
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Affiliation(s)
- Eui-Seung Jeong
- Department of Biochemistry, Inha University School of Medicine, Incheon 22212. Korea
| | - Bo-Hyun Park
- Department of Biochemistry, Inha University School of Medicine, Incheon 22212. Korea
| | - Sujin Lee
- Department of Biochemistry, Inha University School of Medicine, Incheon 22212. Korea
| | - Jun-Hyeog Jang
- Department of Biochemistry, Inha University School of Medicine, Incheon 22212. Korea
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7
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Valussi M, Besser J, Wystub-Lis K, Zukunft S, Richter M, Kubin T, Boettger T, Braun T. Repression of Osmr and Fgfr1 by miR-1/133a prevents cardiomyocyte dedifferentiation and cell cycle entry in the adult heart. SCIENCE ADVANCES 2021; 7:eabi6648. [PMID: 34644107 PMCID: PMC8514096 DOI: 10.1126/sciadv.abi6648] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Dedifferentiation of cardiomyocytes is part of the survival program in the remodeling myocardium and may be essential for enabling cardiomyocyte proliferation. In addition to transcriptional processes, non-coding RNAs play important functions for the control of cell cycle regulation in cardiomyocytes and cardiac regeneration. Here, we demonstrate that suppression of FGFR1 and OSMR by miR-1/133a is instrumental to prevent cardiomyocyte dedifferentiation and cell cycle entry in the adult heart. Concomitant inactivation of both miR-1/133a clusters in adult cardiomyocytes activates expression of cell cycle regulators, induces a switch from fatty acid to glycolytic metabolism, and changes expression of extracellular matrix genes. Inhibition of FGFR and OSMR pathways prevents most effects of miR-1/133a inactivation. Short-term miR-1/133a depletion protects cardiomyocytes against ischemia, while extended loss of miR-1/133a causes heart failure. Our results demonstrate a crucial role of miR-1/133a–mediated suppression of Osmr and Ffgfr1 in maintaining the postmitotic differentiated state of cardiomyocytes.
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Affiliation(s)
- Melissa Valussi
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, Ludwigstrasse 43, D-61231 Bad Nauheim, Germany
| | - Johannes Besser
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, Ludwigstrasse 43, D-61231 Bad Nauheim, Germany
| | - Katharina Wystub-Lis
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, Ludwigstrasse 43, D-61231 Bad Nauheim, Germany
| | - Sven Zukunft
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, D-60590 Frankfurt am Main, Germany
| | - Manfred Richter
- Department of Cardiac Surgery, Kerckhoff Heart Center, Benekestrasse 2-8, D-61231 Bad Nauheim, Germany
| | - Thomas Kubin
- Department of Cardiac Surgery, Kerckhoff Heart Center, Benekestrasse 2-8, D-61231 Bad Nauheim, Germany
| | - Thomas Boettger
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, Ludwigstrasse 43, D-61231 Bad Nauheim, Germany
- Corresponding author. (T.Bo.); (T.Br.)
| | - Thomas Braun
- Department of Cardiac Development and Remodelling, Max Planck Institute for Heart and Lung Research, Ludwigstrasse 43, D-61231 Bad Nauheim, Germany
- German Center for Cardiovascular Research (DZHK), Berlin, Germany
- German Center for Lung Research (DZL), Giessen, Germany
- Corresponding author. (T.Bo.); (T.Br.)
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8
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Transcription factor TEAD1 is essential for vascular development by promoting vascular smooth muscle differentiation. Cell Death Differ 2019; 26:2790-2806. [PMID: 31024075 DOI: 10.1038/s41418-019-0335-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 03/04/2019] [Accepted: 04/04/2019] [Indexed: 12/25/2022] Open
Abstract
TEAD1 (TEA domain transcription factor 1), a transcription factor known for the functional output of Hippo signaling, is important for tumorigenesis. However, the role of TEAD1 in the development of vascular smooth muscle cell (VSMC) is unknown. To investigate cell-specific role of Tead1, we generated cardiomyocyte (CMC) and VSMC-specific Tead1 knockout mice. We found CMC/VSMC-specific deletion of Tead1 led to embryonic lethality by E14.5 in mice due to hypoplastic cardiac and vascular walls, as a result of impaired CMC and VSMC proliferation. Whole transcriptome analysis revealed that deletion of Tead1 in CMCs/VSMCs downregulated expression of muscle contractile genes and key transcription factors including Pitx2c and myocardin. In vitro studies demonstrated that PITX2c and myocardin rescued TEAD1-dependent defects in VSMC differentiation. We further identified Pitx2c as a novel transcriptional target of TEAD1, and PITX2c exhibited functional synergy with myocardin by directly interacting with myocardin, leading to augment the differentiation of VSMC. In summary, our study reveals a critical role of Tead1 in cardiovascular development in mice, but also identifies a novel regulatory mechanism, whereby Tead1 functions upstream of the genetic regulatory hierarchy for establishing smooth muscle contractile phenotype.
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Schwartz SM, Virmani R, Majesky MW. An update on clonality: what smooth muscle cell type makes up the atherosclerotic plaque? F1000Res 2018; 7:F1000 Faculty Rev-1969. [PMID: 30613386 PMCID: PMC6305222 DOI: 10.12688/f1000research.15994.1] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/06/2018] [Indexed: 12/13/2022] Open
Abstract
Almost 50 years ago, Earl Benditt and his son John described the clonality of the atherosclerotic plaque. This led Benditt to propose that the atherosclerotic lesion was a smooth muscle neoplasm, similar to the leiomyomata seen in the uterus of most women. Although the observation of clonality has been confirmed many times, interest in the idea that atherosclerosis might be a form of neoplasia waned because of the clinical success of treatments for hyperlipemia and because animal models have made great progress in understanding how lipid accumulates in the plaque and may lead to plaque rupture. Four advances have made it important to reconsider Benditt's observations. First, we now know that clonality is a property of normal tissue development. Second, this is even true in the vessel wall, where we now know that formation of clonal patches in that wall is part of the development of smooth muscle cells that make up the tunica media of arteries. Third, we know that the intima, the "soil" for development of the human atherosclerotic lesion, develops before the fatty lesions appear. Fourth, while the cells comprising this intima have been called "smooth muscle cells", we do not have a clear definition of cell type nor do we know if the initial accumulation is clonal. As a result, Benditt's hypothesis needs to be revisited in terms of changes in how we define smooth muscle cells and the quite distinct developmental origins of the cells that comprise the muscular coats of all arterial walls. Finally, since clonality of the lesions is real, the obvious questions are do these human tumors precede the development of atherosclerosis, how do the clones develop, what cell type gives rise to the clones, and in what ways do the clones provide the soil for development and natural history of atherosclerosis?
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Affiliation(s)
| | - Renu Virmani
- CV Path Institute, Gaithersberg, Maryland, 20878, USA
| | - Mark W. Majesky
- Center for Developmental Biology and Regenerative Medicine, Seattle Children's Hospital Research Institute, Seattle, WA, 98112, USA
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10
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Piórkowska K, Żukowski K, Ropka-Molik K, Tyra M, Gurgul A. A comprehensive transcriptome analysis of skeletal muscles in two Polish pig breeds differing in fat and meat quality traits. Genet Mol Biol 2018; 41:125-136. [PMID: 29658965 PMCID: PMC5901489 DOI: 10.1590/1678-4685-gmb-2016-0101] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 09/11/2017] [Indexed: 12/31/2022] Open
Abstract
Pork is the most popular meat in the world. Unfortunately, the selection pressure
focused on high meat content led to a reduction in pork quality. The present
study used RNA-seq technology to identify metabolic process genes related to
pork quality traits and fat deposition. Differentially expressed genes (DEGs)
were identified between pigs of Pulawska and Polish Landrace breeds for two the
most important muscles (semimembranosus and longissimus
dorsi). A total of 71 significant DEGs were reported: 15 for
longissimus dorsi and 56 for
semimembranosus muscles. The genes overexpressed in
Pulawska pigs were involved in lipid metabolism (APOD,
LXRA, LIPE, AP2B1, ENSSSCG00000028753 and
OAS2) and proteolysis (CST6, CTSD, ISG15
and UCHL1). In Polish Landrace pigs, genes playing a role in
biological adhesion (KIT, VCAN, HES1, SFRP2, CDH11, SSX2IP and
PCDH17), actin cytoskeletal organisation (FRMD6,
LIMK1, KIF23 and CNN1) and calcium ion binding
(PVALB, CIB2, PCDH17, VCAN and CDH11) were
transcriptionally more active. The present study allows for better understanding
of the physiological processes associated with lipid metabolism and muscle fiber
organization. This information could be helpful in further research aiming to
estimate the genetic markers.
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Affiliation(s)
- Katarzyna Piórkowska
- Department of Animal Molecular Biology, National Research Institute of Animal Production, Balice, Poland
| | - Kacper Żukowski
- Department of Cattle Breeding, National Research Institute of Animal Production, Balice, Poland
| | - Katarzyna Ropka-Molik
- Department of Animal Molecular Biology, National Research Institute of Animal Production, Balice, Poland
| | - Mirosław Tyra
- Department of Pig Breeding, National Research Institute of Animal Production, Balice, Poland
| | - Artur Gurgul
- Department of Animal Molecular Biology, National Research Institute of Animal Production, Balice, Poland
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Dale M, Fitzgerald MP, Liu Z, Meisinger T, Karpisek A, Purcell LN, Carson JS, Harding P, Lang H, Koutakis P, Batra R, Mietus CJ, Casale G, Pipinos I, Baxter BT, Xiong W. Premature aortic smooth muscle cell differentiation contributes to matrix dysregulation in Marfan Syndrome. PLoS One 2017; 12:e0186603. [PMID: 29040313 PMCID: PMC5645122 DOI: 10.1371/journal.pone.0186603] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 10/04/2017] [Indexed: 12/14/2022] Open
Abstract
Thoracic aortic aneurysm and dissection are life-threatening complications of Marfan syndrome (MFS). Studies of human and mouse aortic samples from late stage MFS demonstrate increased TGF-β activation/signaling and diffuse matrix changes. However, the role of the aortic smooth muscle cell (SMC) phenotype in early aneurysm formation in MFS has yet to be fully elucidated. As our objective, we investigated whether an altered aortic SMC phenotype plays a role in aneurysm formation in MFS. We describe previously unrecognized concordant findings in the aortas of a murine model of MFS, mgR, during a critical and dynamic phase of early development. Using Western blot, gelatin zymography, and histological analysis, we demonstrated that at postnatal day (PD) 7, before aortic TGF-β levels are increased, there is elastic fiber fragmentation/disorganization and increased levels of MMP-2 and MMP-9. Compared to wild type (WT) littermates, aortic SMCs in mgR mice express higher levels of contractile proteins suggesting a switch to a more mature contractile phenotype. In addition, tropoelastin levels are decreased in mgR mice, a finding consistent with a premature switch to a contractile phenotype. Proliferation assays indicate a decrease in the proliferation rate of mgR cultured SMCs compared to WT SMCs. KLF4, a regulator of smooth muscle cell phenotype, was decreased in aortic tissue of mgR mice. Finally, overexpression of KLF4 partially reversed this phenotypic change in the Marfan SMCs. This study indicates that an early phenotypic switch appears to be associated with initiation of important metabolic changes in SMCs that contribute to subsequent pathology in MFS.
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Affiliation(s)
- Matthew Dale
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Matthew P. Fitzgerald
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Zhibo Liu
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Trevor Meisinger
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Andrew Karpisek
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Laura N. Purcell
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Jeffrey S. Carson
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Paul Harding
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Haili Lang
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Panagiotis Koutakis
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Rishi Batra
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Constance J. Mietus
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - George Casale
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Iraklis Pipinos
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - B. Timothy Baxter
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
| | - Wanfen Xiong
- Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States of America
- * E-mail:
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Shen EM, McCloskey KE. Development of Mural Cells: From In Vivo Understanding to In Vitro Recapitulation. Stem Cells Dev 2017; 26:1020-1041. [DOI: 10.1089/scd.2017.0020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Edwin M. Shen
- Graduate Program in Biological Engineering and Small-scale Technologies
| | - Kara E. McCloskey
- Graduate Program in Biological Engineering and Small-scale Technologies
- School of Engineering, University of California, Merced, Merced, California
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Saleh Al-Shehabi T, Iratni R, Eid AH. Anti-atherosclerotic plants which modulate the phenotype of vascular smooth muscle cells. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2016; 23:1068-1081. [PMID: 26776961 DOI: 10.1016/j.phymed.2015.10.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/27/2015] [Accepted: 10/30/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND Cardiovascular disease (CVD) remains the leading cause of global death, with atherosclerosis being a major contributor to this mortality. Several mechanisms are implicated in the pathogenesis of this disease. A key element in the development and progression of atherosclerotic lesions is the phenotype of vascular smooth muscle cells. Under pathophysiologic conditions such as injury, these cells switch from a contractile to a synthetic phenotype that often possesses high proliferative and migratory capacities. PURPOSE Despite major advances made in the management and treatment of atherosclerosis, mortality associated with this disease remains high. This mandates that other approaches be sought. Herbal medicine, especially for the treatment of CVD, has been gaining more attention in recent years. This is in no small part due to the evidence-based values associated with the consumption of many plants as well as the relatively cheaper prices, easier access and conventional folk medicine "inherited" over generations. Sections: In this review, we provide a brief introduction about the pathogenesis of atherosclerosis then we highlight the role of vascular smooth muscle cells in this disease, especially when a phenotypic switch of these cells arises. We then thoroughly discuss the various plants that show potentially beneficial effects as anti-atherosclerotic, with prime attention given to herbs and plants that inhibit the phenotypic switch of vascular smooth muscle cells. CONCLUSION Accumulating evidence provides the justification for the use of botanicals in the treatment or prevention of atherosclerosis. However, further studies, especially clinical ones, are warranted to better define several pharmacological parameters of these herbs, such as toxicity, tolerability, and efficacy.
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Affiliation(s)
- Tuqa Saleh Al-Shehabi
- Department of Health Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar.
| | - Rabah Iratni
- Department of Biology, College of Science, United Arab Emirates University, PO Box 15551, Al Ain, United Arab Emirates.
| | - Ali H Eid
- Department of Pharmacology and Toxicology, Faculty of Medicine, American University of Beirut, PO Box 11-0236, Beirut, Lebanon ; Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, Doha, Qatar.
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14
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Liu R, Jin JP. Calponin isoforms CNN1, CNN2 and CNN3: Regulators for actin cytoskeleton functions in smooth muscle and non-muscle cells. Gene 2016; 585:143-153. [PMID: 26970176 PMCID: PMC5325697 DOI: 10.1016/j.gene.2016.02.040] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 02/13/2016] [Accepted: 02/25/2016] [Indexed: 01/04/2023]
Abstract
Calponin is an actin filament-associated regulatory protein expressed in smooth muscle and many types of non-muscle cells. Three homologous genes, CNN1, CNN2 and CNN3, encoding calponin isoforms 1, 2, and 3, respectively, are present in vertebrate species. All three calponin isoforms are actin-binding proteins with functions in inhibiting actin-activated myosin ATPase and stabilizing the actin cytoskeleton, while each isoform executes different physiological roles based on their cell type-specific expressions. Calponin 1 is specifically expressed in smooth muscle cells and plays a role in fine-tuning smooth muscle contractility. Calponin 2 is expressed in both smooth muscle and non-muscle cells and regulates multiple actin cytoskeleton-based functions. Calponin 3 participates in actin cytoskeleton-based activities in embryonic development and myogenesis. Phosphorylation has been extensively studied for the regulation of calponin functions. Cytoskeleton tension regulates the transcription of CNN2 gene and the degradation of calponin 2 protein. This review summarizes our knowledge learned from studies over the past three decades, focusing on the evolutionary lineage of calponin isoform genes, their tissue- and cell type-specific expressions, structure-function relationships, and mechanoregulation.
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Affiliation(s)
- Rong Liu
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Street, Detroit, MI 48201, USA
| | - J-P Jin
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Street, Detroit, MI 48201, USA.
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15
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Zeng L, Li Y, Yang J, Wang G, Margariti A, Xiao Q, Zampetaki A, Yin X, Mayr M, Mori K, Wang W, Hu Y, Xu Q. XBP 1-Deficiency Abrogates Neointimal Lesion of Injured Vessels Via Cross Talk With the PDGF Signaling. Arterioscler Thromb Vasc Biol 2015; 35:2134-44. [PMID: 26315405 DOI: 10.1161/atvbaha.115.305420] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 08/16/2015] [Indexed: 01/04/2023]
Abstract
OBJECTIVE Smooth muscle cell (SMC) migration and proliferation play an essential role in neointimal formation after vascular injury. In this study, we intended to investigate whether the X-box-binding protein 1 (XBP1) was involved in these processes. APPROACH AND RESULTS In vivo studies on femoral artery injury models revealed that vascular injury triggered an immediate upregulation of XBP1 expression and splicing in vascular SMCs and that XBP1 deficiency in SMCs significantly abrogated neointimal formation in the injured vessels. In vitro studies indicated that platelet-derived growth factor-BB triggered XBP1 splicing in SMCs via the interaction between platelet-derived growth factor receptor β and the inositol-requiring enzyme 1α. The spliced XBP1 (XBP1s) increased SMC migration via PI3K/Akt activation and proliferation via downregulating calponin h1 (CNN1). XBP1s directed the transcription of mir-1274B that targeted CNN1 mRNA degradation. Proteomic analysis of culture media revealed that XBP1s decreased transforming growth factor (TGF)-β family proteins secretion via transcriptional suppression. TGF-β3 but not TGF-β1 or TGF-β2 attenuated XBP1s-induced CNN1 decrease and SMC proliferation. CONCLUSIONS This study demonstrates for the first time that XBP1 is crucial for SMC proliferation via modulating the platelet-derived growth factor/TGF-β pathways, leading to neointimal formation.
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Affiliation(s)
- Lingfang Zeng
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.).
| | - Yi Li
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Juanyao Yang
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Gang Wang
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Andriana Margariti
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Qingzhong Xiao
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Anna Zampetaki
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Xiaoke Yin
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Manuel Mayr
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Kazutoshi Mori
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Wen Wang
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Yanhua Hu
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.)
| | - Qingbo Xu
- From the Cardiovascular Division, King's College London BHF Centre, London, United Kingdom (L.Z., Y.L., J.Y., A.Z., X.Y., M.M., Y.H., Q.X.); Institute of Bioengineering (J.Y., W.W.) and Centre for Clinical Pharmacology, William Harvey Research Institute, Barts and The London School of Medicine and Dentistry (Q.X.), Queen Mary University of London, London, United Kingdom; Department of Emergency Medicine, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, China (G.W.); Centre for Experimental Medicine, Queen's University Belfast, Belfast, United Kingdom (A.M.); and Department of Biophysics, Graduate School of Science, Kyoto University, Kyoto, Japan (K.M.).
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Rattan S, Ali M. Role of SM22 in the differential regulation of phasic vs. tonic smooth muscle. Am J Physiol Gastrointest Liver Physiol 2015; 308:G605-12. [PMID: 25617350 PMCID: PMC4385893 DOI: 10.1152/ajpgi.00360.2014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 01/16/2015] [Indexed: 01/31/2023]
Abstract
Preliminary proteomics studies between tonic vs. phasic smooth muscles identified three distinct protein spots identified to be those of transgelin (SM22). The latter was found to be distinctly downregulated in the internal anal sphincter (IAS) vs. rectal smooth muscle (RSM) SMC. The major focus of the present studies was to examine the differential molecular control mechanisms by SM22 in the functionality of truly tonic smooth muscle of the IAS vs. the adjoining phasic smooth muscle of the RSM. We monitored SMC lengths before and after incubation with pFLAG-SM22 (for SM22 overexpression), and SM22 small-interfering RNA. pFLAG-SM22 caused concentration-dependent and significantly greater relaxation in the IAS vs. the RSM SMCs. Conversely, temporary silencing of SM22 caused contraction in both types of the SMCs. Further studies revealed a significant reverse relationship between the levels of SM22 phosphorylation and the amount of SM22-actin binding in the IAS and RSM SMC. Data showed higher phospho-SM22 levels and decreased SM22-actin binding in the IAS, and reverse to be the case in the RSM SMCs. Experiments determining the mechanism for SM22 phosphorylation in these smooth muscles revealed that Y-27632 (Rho kinase inhibitor) but not Gö-6850 (protein kinase C inhibitor) caused concentration-dependent decreased phosphorylation of SM22. We speculate that SM22 plays an important role in the regulation of basal tone via Rho kinase-induced phosphorylation of SM22.
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Affiliation(s)
- Satish Rattan
- Division of Gastroenterology and Hepatology, Department of Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania; and
| | - Mehboob Ali
- 2The Research Institute at Nationwide Children's Hospital, Columbus, Ohio
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17
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Multifaceted roles of miR-1s in repressing the fetal gene program in the heart. Cell Res 2014; 24:278-92. [PMID: 24481529 DOI: 10.1038/cr.2014.12] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 12/27/2013] [Accepted: 12/30/2013] [Indexed: 01/04/2023] Open
Abstract
miRNAs are an important class of regulators that play roles in cellular homeostasis and disease. Muscle-specific miRNAs, miR-1-1 and miR-1-2, have been found to play important roles in regulating cell proliferation and cardiac function. Redundancy between miR-1-1 and miR-1-2 has previously impeded a full understanding of their roles in vivo. To determine how miR-1s regulate cardiac function in vivo, we generated mice lacking miR-1-1 and miR-1-2 without affecting nearby genes. miR-1 double knockout (miR-1 dKO) mice were viable and not significantly different from wild-type controls at postnatal day 2.5. Thereafter, all miR-1 dKO mice developed dilated cardiomyopathy (DCM) and died before P17. Massively parallel sequencing showed that a large portion of upregulated genes after deletion of miR-1s is associated with the cardiac fetal gene program including cell proliferation, glycolysis, glycogenesis, and fetal sarcomere-associated genes. Consistent with gene profiling, glycogen content and glycolytic rates were significantly increased in miR-1 dKO mice. Estrogen-related Receptor β (Errβ) was identified as a direct target of miR-1, which can regulate glycolysis, glycogenesis, and the expression of sarcomeric proteins. Cardiac-specific overexpression of Errβ led to glycogen storage, cardiac dilation, and sudden cardiac death around 3-4 weeks of age. We conclude that miR-1 and its primary target Errβ act together to regulate the transition from prenatal to neonatal stages by repressing the cardiac fetal gene program. Loss of this regulation leads to a neonatal DCM.
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Abstract
Vascular smooth muscle cells have attracted considerable interest as a model for a flexible program of gene expression. This cell type arises throughout the embryo body plan via poorly understood signaling cascades that direct the expression of transcription factors and microRNAs which, in turn, orchestrate the activation of contractile genes collectively defining this cell lineage. The discovery of myocardin and its close association with serum response factor has represented a major break-through for the molecular understanding of vascular smooth muscle cell differentiation. Retinoids have been shown to improve the outcome of vessel wall remodeling following injury and have provided further insights into the molecular circuitry that defines the vascular smooth muscle cell phenotype. This review summarizes the progress to date in each of these areas of vascular smooth muscle cell biology.
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Sirenko VV, Simonyan AH, Dobrzhanskaya AV, Shelud'ko NS, Borovikov YS. 40-kDa protein from thin filaments of the mussel Crenomytilus grayanus changes the conformation of F-actin during the ATPase cycle. BIOCHEMISTRY. BIOKHIMIIA 2013; 78:273-81. [PMID: 23586721 DOI: 10.1134/s0006297913030097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Polarized fluorimetry was used to study in ghost muscle fibers the influence of a 40-kDa protein from the thin filaments of the mussel Crenomytilus grayanus on conformational changes of F-actin modified by the fluorescent probes 1,5-IAEDANS and FITC-phalloidin during myosin subfragment (S1) binding in the absence of nucleotides and in the presence of MgADP or MgATP. The fluorescence probes were rigidly bound with actin, which made the absorption and emission dipoles of the probes sensitive to changes in the orientation and mobility of both actin monomer and its subdomain-1 in thin filaments of the muscle fiber. On modeling different intermediate states of actomyosin, the orientation and mobility of oscillators of the dyes were changed discretely, which suggests multistep changes in the actin conformation during the cycle of ATP hydrolysis. The 40-kDa protein influenced the orientation and mobility of the fluorescent probes markedly, suppressing changes in their orientation and mobility in the absence of nucleotides and in the presence of MgADP, but enhancing these changes in the presence of MgATP. The calponin-like 40-kDa protein is supposed to prevent formation of the strong binding state of actomyosin in the absence of nucleotides and in the presence of MgADP but to activate formation of this state in the presence of MgATP.
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Affiliation(s)
- V V Sirenko
- Institute of Cytology, Russian Academy of Sciences, Tikhoretsky pr. 4, St. Petersburg, Russia
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20
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Wang T, Kendig DM, Chang S, Trappanese DM, Chacko S, Moreland RS. Bladder smooth muscle organ culture preparation maintains the contractile phenotype. Am J Physiol Renal Physiol 2012; 303:F1382-97. [PMID: 22896042 PMCID: PMC3518193 DOI: 10.1152/ajprenal.00261.2011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Accepted: 08/13/2012] [Indexed: 01/26/2023] Open
Abstract
Smooth muscle cells, when subjected to culture, modulate from a contractile to a secretory phenotype. This has hampered the use of cell culture for molecular techniques to study the regulation of smooth muscle biology. The goal of this study was to develop a new organ culture model of bladder smooth muscle (BSM) that would maintain the contractile phenotype and aid in the study of BSM biology. Our results showed that strips of BSM subjected to up to 9 days of organ culture maintained their contractile phenotype, including the ability to achieve near-control levels of force with a temporal profile similar to that of noncultured tissues. The technical aspects of our organ culture preparation that were responsible, in part, for the maintenance of the contractile phenotype were a slight longitudinal stretch during culture and subjection of the strips to daily contraction-relaxation. The tissues contained viable cells throughout the cross section of the strips. There was an increase in extracellular collagenous matrix, resulting in a leftward shift in the passive length-tension relationship. There were no significant changes in the content of smooth muscle-specific α-actin, calponin, h-caldesmon, total myosin heavy chain, protein kinase G, Rho kinase-I, or the ratio of SM1 to SM2 myosin isoforms. Moreover the organ cultured tissues maintained functional voltage-gated calcium channels and large-conductance calcium-activated potassium channels. Therefore, we propose that this novel BSM organ culture model maintains the contractile phenotype and will be a valuable tool for the use in cellular/molecular biology studies of bladder myocytes.
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Affiliation(s)
- Tanchun Wang
- Dept. of Pharmacology and Physiology, Drexel Univ. College of Medicine, 245 N 15th St., MS 488, Philadelphia, PA 19102, USA
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Potential role of LMP2 as an anti-oncogenic factor in human uterine leiomyosarcoma: morphological significance of calponin h1. FEBS Lett 2012; 586:1824-31. [PMID: 22659265 DOI: 10.1016/j.febslet.2012.05.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 05/12/2012] [Accepted: 05/14/2012] [Indexed: 01/04/2023]
Abstract
Uterine leiomyosarcoma (LMS) is a highly metastatic smooth muscle neoplasm for which calponin h1 is suspected to have a biological role as a tumor-suppressor. We earlier reported that LMP2-null mice spontaneously develop uterine LMS through malignant transformation of the myometrium, thus implicating this protein as an anti-tumorigenic candidate as well. In the present study, we show that LMP2 may negatively regulate LMS independently of its role in the proteasome. Moreover, several lines of evidence indicate that although calponin h1 does not directly influence tumorigenesis, it clearly affects LMP2-induced cellular morphological changes. Modulation of LMP2 may lead to new therapeutic approaches in human uterine LMS.
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22
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Long X, Slivano OJ, Cowan SL, Georger MA, Lee TH, Miano JM. Smooth muscle calponin: an unconventional CArG-dependent gene that antagonizes neointimal formation. Arterioscler Thromb Vasc Biol 2011; 31:2172-80. [PMID: 21817093 PMCID: PMC3179981 DOI: 10.1161/atvbaha.111.232785] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Smooth muscle calponin (CNN1) contains multiple conserved intronic CArG elements that bind serum response factor and display enhancer activity in vitro. The objectives here were to evaluate these CArG elements for activity in transgenic mice and determine the effect of human CNN1 on injury-induced vascular remodeling. METHODS AND RESULTS Mice carrying a lacZ reporter under control of intronic CArG elements in the human CNN1 gene failed to show smooth muscle cell (SMC)-restricted activity. However, deletion of the orthologous sequences in mice abolished endogenous Cnn1 promoter activity, suggesting their necessity for in vivo Cnn1 expression. Mice carrying a 38-kb bacterial artificial chromosome (BAC) harboring the human CNN1 gene displayed SMC- restricted expression of the corresponding CNN1 protein, as measured by immunohistochemistry and Western blotting. Extensive BAC recombineering studies revealed the absolute necessity of a single intronic CArG element for correct SMC-restricted expression of human CNN1. Overexpressing human CNN1 suppressed neointimal formation following arterial injury. Mice with an identical BAC carrying mutations in CArG elements that inhibit human CNN1 expression showed outward remodeling and neointimal formation. CONCLUSIONS A single intronic CArG element is necessary but insufficient for proper CNN1 expression in vivo. CNN1 overexpression antagonizes arterial injury-induced neointimal formation.
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MESH Headings
- Animals
- Binding Sites
- Blotting, Western
- Calcium-Binding Proteins/deficiency
- Calcium-Binding Proteins/genetics
- Calcium-Binding Proteins/metabolism
- Carotid Arteries/metabolism
- Carotid Arteries/pathology
- Carotid Artery Injuries/genetics
- Carotid Artery Injuries/metabolism
- Carotid Artery Injuries/pathology
- Cell Line
- Cell Proliferation
- Chromosomes, Artificial, Bacterial
- Disease Models, Animal
- Gene Expression Regulation
- Genes, Reporter
- Humans
- Immunohistochemistry
- Introns
- Lac Operon
- Luciferases/genetics
- Luciferases/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Microfilament Proteins/deficiency
- Microfilament Proteins/genetics
- Microfilament Proteins/metabolism
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Promoter Regions, Genetic
- Rats
- Serum Response Element
- Serum Response Factor/metabolism
- Transfection
- Tunica Intima/metabolism
- Tunica Intima/pathology
- Calponins
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Affiliation(s)
- Xiaochun Long
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
| | - Orazio J. Slivano
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
| | - Sarah L. Cowan
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
| | - Mary A. Georger
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
| | - Ting-Hein Lee
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
| | - Joseph M. Miano
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642
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23
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Ono H, Yoshikawa H, Ueda T, Yamamura H, Kudawara I, Manou M, Ishiguro S, Funai H, Koyanagi Y, Araki N, Hashimoto N, Sonobe H, Tatsuta M, Takahashi K. Expression of smooth muscle calponin in synovial sarcoma. Sarcoma 2011; 3:107-13. [PMID: 18521272 PMCID: PMC2395415 DOI: 10.1080/13577149977730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Purpose. Histogenesis of synovial sarcoma remains controversial and reliable molecular markers for diagnosis are necessary. Expression of basic calponin, a smooth muscle differentiation-specific actin-binding protein, was studied in synovial sarcoma.Subjects and Methods. The basic calponin gene and the gene product were analyzed by reverse transcription PCR analysis (RT-PCR) and immunohistochemistry in 14 synovial sarcomas and a human synovial sarcoma cell line (HS-SY-II).Results and Discussion. Immunoreactivity for basic calponin was detected in the cytoplasm of 6 synovial sarcomas (43% positive). In the basic calponin-positive tumors and the HS-SY-II cells, expression for smooth muscle-specific genes, including basic calponin and SM22alpha , was detected by RT-PCR, suggesting a lineage relationship between synovial sarcoma cells and smooth muscle-like mesenchymal cells.Conclusions. A subset of synovial sarcomas expressing the basic calponin gene and the gene product were identified. The basic calponin may have potential utility as a novel molecular marker identifying certain synovial sarcomas.
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Affiliation(s)
- H Ono
- Department of Orthopaedic Surgery Osaka Medical Center for Cancer and Cardiovascular Diseases 1-3-3, Nakamichi Higashinari-ku Osaka 537-8511 Japan
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24
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Jones EAV. Mechanical factors in the development of the vascular bed. Respir Physiol Neurobiol 2011; 178:59-65. [PMID: 21458600 DOI: 10.1016/j.resp.2011.03.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 03/23/2011] [Accepted: 03/24/2011] [Indexed: 01/04/2023]
Abstract
During embryonic development, blood flow is needed not only to nourish the developing embryo but is also important for shaping the vascular network such that it becomes hemodynamically efficient. The first blood vessels form a network called the capillary plexus. After the onset of blood flow, the capillary plexus remodel into a more hierarchical tree-shaped network. Mechanical forces created by blood flow are required for remodelling to occur and these forces are believed to induce a maturation of the blood vessels that stabilizes the growing vascular network. The role of mechanical force has been extensively studied in the mature cardiovascular system. Though the events induced by blood flow during development are thought to be similar to what occurs in the adult, there are several important differences between the embryo and the adult. We therefore discuss what is known about the role of mechanical forces in vascular remodelling from the adult cardiovascular system and highlight how embryonic development differs from the adult. We consider the role of blood flow in altering branching morphology, arterial-venous identity and the formation of the blood vessel wall during early vascular development.
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Affiliation(s)
- Elizabeth A V Jones
- Department of Chemical Engineering, McGill University, Montreal, QC, Canada.
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25
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Opitz F, Schenke-Layland K, Cohnert TU, Stock UA. Phenotypical Plasticity of Vascular Smooth Muscle Cells—Effect ofIn VitroandIn VivoShear Stress for Tissue Engineering of Blood Vessels. ACTA ACUST UNITED AC 2007; 13:2505-14. [PMID: 17685849 DOI: 10.1089/ten.2006.0424] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Vascular smooth muscle cells (vSMCs) can switch between a contractile (differentiated) and a synthetic (dedifferentiated) phenotype. Synthetic, proliferative vSMCs are observed during embryogenesis, wound repair, and tissue engineering. The potential of isolated vSMCs to reverse this phenotypic modulation depends strictly on culture conditions. Previous studies have demonstrated that applied shear stress is an important signal for vSMC phenotype. The objective of this study was to determine whether applied shear stress is capable of triggering re-differentiation of vSMCs in tissue-engineered aortas. vSMCs were isolated from ovine arteries. Cells were cultured statically or exposed to two- (2D) and three-dimensional (3D) shear stress after seeding on a tubular matrix. For 3D in vivo testing, grafts were seeded additionally with endothelial cells and implanted in the descending aorta. Particular attention was paid to the expression pattern of vSMC markers, cell ultra-structure, matrix remodeling activity, and proliferative activity. Cultured vSMCs de-differentiated during static in vitro culture, but 2D and 3D in vitro shear stress promoted re-expression of vSMC markers. During in vivo culture, vSMCs progressed toward a fully differentiated phenotype. Cells were expressing markers of differentiated vSMCs and resembled a morphologically contractile vSMC phenotype. Matrix remodeling activity and proliferative activity decreased. This study demonstrates the phenotypic plasticity of vSMCs and their ability to return to a differentiated phenotype under shear stress conditions. These results are crucial for tissue engineering of blood vessels, because they indicate for the first time the in vitro potential to regain physiological functionality of isolated vSMCs.
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Affiliation(s)
- Florian Opitz
- Department of Cardiothoracic and Vascular Surgery, Friedrich-Schiller University, Jena, Germany
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26
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Rozenblum GT, Gimona M. Calponins: adaptable modular regulators of the actin cytoskeleton. Int J Biochem Cell Biol 2007; 40:1990-5. [PMID: 17768079 DOI: 10.1016/j.biocel.2007.07.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Revised: 07/18/2007] [Accepted: 07/19/2007] [Indexed: 12/13/2022]
Abstract
Over 20 years ago Katsuhito Takahashi isolated a heat stable, calmodulin and actin binding protein from chicken gizzard smooth muscle. Considered initially as a mainly structural component of the vertebrate smooth muscle contractile machinery, the 34-kDa calcium- and calmodulin-binding troponin T-like protein, calponin quickly appeared to also be involved in a number of regulatory and signal transduction events in the actin cytoskeleton. Calponins regulate actomyosin contraction, and reduce metastatic cell motility and tissue invasion. From these various cellular functions the biological role of calponin is now slowly emerging, namely that of an actin filament-stabilizing molecule that contributes to physiological thin filament turnover rates in different cell types.
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Affiliation(s)
- Guido T Rozenblum
- Unit of Actin Cytoskeleton Regulation, Consorzio Mario Negri Sud, Department of Cell Biology and Oncology, Via Nazionale 8a, 66030 Santa Maria Imbaro, Italy
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27
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van Tuyn J, Pijnappels DA, de Vries AAF, de Vries I, van der Velde-van Dijke I, Knaän-Shanzer S, van der Laarse A, Schalij MJ, Atsma DE. Fibroblasts from human postmyocardial infarction scars acquire properties of cardiomyocytes after transduction with a recombinant myocardin gene. FASEB J 2007; 21:3369-79. [PMID: 17579192 DOI: 10.1096/fj.07-8211com] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Myocardial scar formation impairs heart function by inducing cardiac remodeling, decreasing myocardial compliance, and compromising normal electrical conduction. Conversion of myocardial scar fibroblasts (MSFs) into (functional) cardiomyocytes may be an effective alternative treatment to limit loss of cardiac performance after myocardial injury. In this study, we investigated whether the phenotype of MSFs can be modified by gene transfer into cells with properties of cardiomyocytes. To this end, fibroblasts from postmyocardial infarction scars of human left ventricles were isolated and characterized by cell biological, immunological, and molecular biological assays. Cultured human MSFs express GATA4 and connexin 43 and display adipogenic differentiation potential. Infection of human MSFs with a lentivirus vector encoding the potent cardiogenic transcription factor myocardin renders them positive for a wide variety of cardiomyocyte-specific proteins, including sarcomeric components, transcription factors, and ion channels, and induces the expression of several smooth muscle marker genes. Forced myocardin expression also endowed human MSFs with the ability to transmit an action potential and to repair an artificially created conduction block in cardiomyocyte cultures. These finding indicate that in vivo myocardin gene transfer may potentially limit cardiomyocyte loss, myocardial fibrosis, and disturbances in electrical conduction caused by myocardial infarction.
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Affiliation(s)
- John van Tuyn
- Department of Cardiology, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands
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28
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Wu SM, Fujiwara Y, Cibulsky SM, Clapham DE, Lien CL, Schultheiss TM, Orkin SH. Developmental origin of a bipotential myocardial and smooth muscle cell precursor in the mammalian heart. Cell 2006; 127:1137-50. [PMID: 17123591 DOI: 10.1016/j.cell.2006.10.028] [Citation(s) in RCA: 399] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 09/27/2006] [Accepted: 10/20/2006] [Indexed: 01/04/2023]
Abstract
Despite recent advances in delineating the mechanisms involved in cardiogenesis, cellular lineage specification remains incompletely understood. To explore the relationship between developmental fate and potential, we isolated a cardiac-specific Nkx2.5(+) cell population from the developing mouse embryo. The majority of these cells differentiated into cardiomyocytes and conduction system cells. Some, surprisingly, adopted a smooth muscle fate. To address the clonal origin of these lineages, we isolated Nkx2.5(+) cells from in vitro differentiated murine embryonic stem cells and found approximately 28% of these cells expressed c-kit. These c-kit(+) cells possessed the capacity for long-term in vitro expansion and differentiation into both cardiomyocytes and smooth muscle cells from a single cell. We confirmed these findings by isolating c-kit(+)Nkx2.5(+) cells from mouse embryos and demonstrated their capacity for bipotential differentiation in vivo. Taken together, these results support the existence of a common precursor for cardiovascular lineages in the mammalian heart.
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Affiliation(s)
- Sean M Wu
- Division of Hematology/Oncology, Children's Hospital, Boston, MA 02115, USA
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29
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Shukla S, Del Gatto-Konczak F, Breathnach R, Fisher SA. Competition of PTB with TIA proteins for binding to a U-rich cis-element determines tissue-specific splicing of the myosin phosphatase targeting subunit 1. RNA (NEW YORK, N.Y.) 2005; 11:1725-36. [PMID: 16177139 PMCID: PMC1370859 DOI: 10.1261/rna.7176605] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2004] [Accepted: 08/09/2005] [Indexed: 05/04/2023]
Abstract
A considerable amount of smooth muscle phenotypic diversity is generated by tissue-specific and developmentally regulated splicing of alternative exons. The control mechanisms are unknown. We are using a myosin phosphatase targeting subunit-1 (MYPT1) alternative exon as a model to investigate this question. In the present study, we show that the RNA binding proteins TIA and PTB function as antagonistic enhancers and suppressors of splicing of the alternative exon, respectively. Each functions through a single U-rich element, containing two UCUU motifs, just downstream of the alternative exon 5' splice site. Tissue-specific down-regulation of TIA protein in the perinatal period allows PTB to bind to the U-rich element and suppress splicing of the alternative exon as the visceral smooth muscle acquires the fast-phasic smooth muscle contractile phenotype. This provides a novel role for PTB in the tissue-specific regulation of splicing of alternative exons during the generation of smooth muscle phenotypic diversity.
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Affiliation(s)
- Supriya Shukla
- Department of Medicine (Cardiology), Case Western Reserve University School of Medicine, BRB 422, Cleveland, OH 44106-4958, USA
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30
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Taniguchi S. Suppression of cancer phenotypes through a multifunctional actin-binding protein, calponin, that attacks cancer cells and simultaneously protects the host from invasion. Cancer Sci 2005; 96:738-46. [PMID: 16271067 PMCID: PMC11160040 DOI: 10.1111/j.1349-7006.2005.00118.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Quantitative and/or qualitative alteration of actin cytoskeletal molecules, involved in the regulation of cellular dynamic functions, should be intimately related with cancer phenotypes. Based on several lines of experimental evidence from our group, and others, this report proposes a strategy to simultaneously attack cancer cells and protect the host from cancer invasion, with one molecule. Calponin h1, an actin-stabilizing protein that is also intimately related to signal transduction, is very often suppressed in vascular smooth muscle cells of malignant human tumors and in mesothelial cells by coexisting cancer cells. We generated mice deficient for calponin h1, exhibiting fragility in blood vessels and peritoneal membranes. Hematogenous cancer metastasis occurred more easily in the calponin h1-deficient mice than in wild-type mice, and the peritoneal dissemination was extremely enhanced. The fragility was rescued by the exogenous introduction of the calponin h1 gene into mesothelial cells of the peritoneum. Furthermore, calponin h1 gene transfer into several transformed cell lines resulted in a suppression of malignancy. The peritoneal dissemination of intraperitoneally-injected B16-F10 cells was suppressed by the calponin h1 gene, given to target both cancer cells and the mesothelial cells of the host. The multifunctional nature of the molecule, as a machinery player of cytoskeleton and mediator of signal transduction, probably resulted in a favorable recipient-discriminating effect on cancerous and normal cells. Thus, we believe that if we use adequate multifunctional molecules for therapy, it is possible to simultaneously suppress cancer phenotypes and protect normal cells from the attack of cancer cells.
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Affiliation(s)
- Shun'ichiro Taniguchi
- Department of Molecular Oncology, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Matsumoto, Japan.
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31
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Gajavelli S, Wood PM, Pennica D, Whittemore SR, Tsoulfas P. BMP signaling initiates a neural crest differentiation program in embryonic rat CNS stem cells. Exp Neurol 2004; 188:205-23. [PMID: 15246821 DOI: 10.1016/j.expneurol.2004.03.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2003] [Revised: 02/04/2004] [Accepted: 03/16/2004] [Indexed: 02/08/2023]
Abstract
Bone morphogenetic proteins (BMPs) have an important role in neuronal and astrocytic differentiation of embryonic and adult neural stem cells (NSCs). Here, we show that BMP6, BMP7, GDF5, and GDF6 instructively differentiate E12, E14, and E17 rat cortical NSCs into a variety of neural crest lineages. Clonal analysis shows that BMP7-treated NSCs develop mostly into smooth muscle and peripheral glia. We observed a rapid induction of premigratory neural crest markers like p75NTR, and AP-2 alpha followed by Msx1, Msx2, and Slug, transcription factors that participate in neural crest development. These results suggest that NSCs cultured in vitro in the presence of FGF2 display expanded developmental potential.
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Affiliation(s)
- Shyam Gajavelli
- Department of Neurosurgery, The Miami Project to Cure Paralysis, University of Miami School of Medicine, FL 33136, USA
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32
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Owens GK, Kumar MS, Wamhoff BR. Molecular regulation of vascular smooth muscle cell differentiation in development and disease. Physiol Rev 2004; 84:767-801. [PMID: 15269336 DOI: 10.1152/physrev.00041.2003] [Citation(s) in RCA: 2513] [Impact Index Per Article: 125.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The focus of this review is to provide an overview of the current state of knowledge of molecular mechanisms/processes that control differentiation of vascular smooth muscle cells (SMC) during normal development and maturation of the vasculature, as well as how these mechanisms/processes are altered in vascular injury or disease. A major challenge in understanding differentiation of the vascular SMC is that this cell can exhibit a wide range of different phenotypes at different stages of development, and even in adult organisms the cell is not terminally differentiated. Indeed, the SMC is capable of major changes in its phenotype in response to changes in local environmental cues including growth factors/inhibitors, mechanical influences, cell-cell and cell-matrix interactions, and various inflammatory mediators. There has been much progress in recent years to identify mechanisms that control expression of the repertoire of genes that are specific or selective for the vascular SMC and required for its differentiated function. One of the most exciting recent discoveries was the identification of the serum response factor (SRF) coactivator gene myocardin that appears to be required for expression of many SMC differentiation marker genes, and for initial differentiation of SMC during development. However, it is critical to recognize that overall control of SMC differentiation/maturation, and regulation of its responses to changing environmental cues, is extremely complex and involves the cooperative interaction of many factors and signaling pathways that are just beginning to be understood. There is also relatively recent evidence that circulating stem cell populations can give rise to smooth muscle-like cells in association with vascular injury and atherosclerotic lesion development, although the exact role and properties of these cells remain to be clearly elucidated. The goal of this review is to summarize the current state of our knowledge in this area and to attempt to identify some of the key unresolved challenges and questions that require further study.
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MESH Headings
- Aging/metabolism
- Animals
- Arteriosclerosis/genetics
- Cell Differentiation
- Cellular Senescence
- Embryo, Mammalian/cytology
- Embryo, Mammalian/metabolism
- Humans
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/embryology
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Vascular Diseases/genetics
- Vascular Diseases/metabolism
- Vascular Diseases/pathology
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Affiliation(s)
- Gary K Owens
- Dept. of Molecular Physiology and Biological Physics, Univ. of Virginia School of Medicine, 415 Lane Rd., Medical Research Building 5, Rm. 1220, PO Box 801394, Charlottesville, VA 22908, USA.
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33
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Koganehira Y, Takeoka M, Ehara T, Sasaki K, Murata H, Saida T, Taniguchi S. Reduced expression of actin-binding proteins, h-caldesmon and calponin h1, in the vascular smooth muscle inside melanoma lesions: an adverse prognostic factor for malignant melanoma. Br J Dermatol 2003; 148:971-80. [PMID: 12786828 DOI: 10.1046/j.1365-2133.2003.05238.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND The structural integrity of the blood vessels such as small arteries and veins is studied less frequently in malignant tumours than is angiogenesis. Objectives To clarify the characteristics of small arteries and small veins of melanoma lesions. METHODS We immunohistochemically investigated various types of melanocytic tumours using antibodies specific for endothelial and vascular smooth muscle cells, and analysed the relationship between the expression of these molecules in the blood vessels and the biological characteristics of the tumours. Formalin-fixed, paraffin-embedded sections of 15 cases of benign melanocytic tumours and 64 cases of malignant melanomas were investigated. RESULTS Significant suppression of expression of h-caldesmon (h-CD) and calponin h1 (CNh1) was observed in the blood vessels of malignant melanomas compared with both benign melanocytic tumours and normal tissues. In particular, the level of h-CD expression was inversely correlated with the frequency of metastasis and positively correlated with the survival rate in patients with malignant melanoma. CONCLUSIONS These findings suggest that alterations of the tumour vessels are an important factor for the prognosis of malignant melanoma, and that suppression of h-CD and CNh1 in the blood vessels in malignant melanoma reflects a structural fragility of the vessels, leading to their easy penetration by tumour cells. Defective expression of these molecules is likely to be an important marker for metastatic potential and for poor prognosis of melanoma.
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Affiliation(s)
- Y Koganehira
- Department of Dermatology, Molecular Oncology and Angiology, Research Center on Aging and Adaptation, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan
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34
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King KE, Iyemere VP, Weissberg PL, Shanahan CM. Krüppel-like factor 4 (KLF4/GKLF) is a target of bone morphogenetic proteins and transforming growth factor beta 1 in the regulation of vascular smooth muscle cell phenotype. J Biol Chem 2003; 278:11661-9. [PMID: 12538588 DOI: 10.1074/jbc.m211337200] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Vascular smooth muscle cell (VSMC) differentiation and phenotypic modulation is characterized by changes in mRNA expression for smooth muscle (SM) marker contractile proteins such as alpha-SM actin and SM22 alpha. Transforming growth factor beta1 (TGF-beta 1) is a potent VSMC differentiation factor; however, it is not known if other TGF-beta-superfamily members, in particular the bone morphogenetic proteins (BMPs), modulate VSMC phenotype. Here we demonstrate that a large subset of TGF-beta-superfamily members and their type I receptors are differentially co-expressed as VSMC phenotype changes during fetal/neonatal development and that BMP2, -4, and -6 reciprocally regulate SM-marker mRNA and protein expression in vitro. BMP2 and BMP6 decrease expression of the SM markers alpha-SM actin, SM22alpha, and calponin in rat VSMCs, whereas BMP4 increases their expression. The effects of BMP-2, -4, and -6 on SM marker gene transcription are mediated through a consensus TGF-beta-controlling element, the TCE, which is common to regulatory regions of SM-marker genes. Moreover, co-treatment experiments revealed that BMP-2, -4, and -6 each inhibit TGF-beta 1-modulated increases in SM22alpha reporter gene activity. Regardless of whether they positively or negatively regulate SM marker expression, TGF-beta 1 and BMP-2, -4, and -6 all induced binding of the Krüppel-like transcription factor, GKLF/KLF4, to the TGF-beta control element. Induction of KLF4 was confirmed by immunocytochemistry and Western blotting, which revealed that a lower molecular weight KLF4 protein is induced after treatment with TGF-beta-superfamily members. Taken together, our results demonstrate that multiple members of the TGF-beta superfamily act in concert to modulate VSMC phenotype.
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Affiliation(s)
- Kathryn E King
- University of Cambridge, Department of Medicine, Addenbrooke's Centre for Clinical Investigation Level 6, Box 110 Addenbrooke's Hospital, Hills Rd., Cambridge CB2 2QQ, United Kingdom
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35
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McGrath KE, Koniski AD, Malik J, Palis J. Circulation is established in a stepwise pattern in the mammalian embryo. Blood 2003; 101:1669-76. [PMID: 12406884 DOI: 10.1182/blood-2002-08-2531] [Citation(s) in RCA: 193] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
To better understand the relationship between the embryonic hematopoietic and vascular systems, we investigated the establishment of circulation in mouse embryos by examining the redistribution of yolk sac-derived primitive erythroblasts and definitive hematopoietic progenitors. Our studies revealed that small numbers of erythroblasts first enter the embryo proper at 4 to 8 somite pairs (sp) (embryonic day 8.25 [E8.25]), concomitant with the proposed onset of cardiac function. Hours later (E8.5), most red cells remained in the yolk sac. Although the number of red cells expanded rapidly in the embryo proper, a steady state of approximately 40% red cells was not reached until 26 to 30 sp (E10). Additionally, erythroblasts were unevenly distributed within the embryo's vasculature before 35 sp. These data suggest that fully functional circulation is established after E10. This timing correlated with vascular remodeling, suggesting that vessel arborization, smooth muscle recruitment, or both are required. We also examined the distribution of committed hematopoietic progenitors during early embryogenesis. Before E8.0, all progenitors were found in the yolk sac. When normalized to circulating erythroblasts, there was a significant enrichment (20- to 5-fold) of progenitors in the yolk sac compared with the embryo proper from E9.5 to E10.5. These results indicated that the yolk sac vascular network remains a site of progenitor production and preferential adhesion even as the fetal liver becomes a hematopoietic organ. We conclude that a functional vascular system develops gradually and that specialized vascular-hematopoietic environments exist after circulation becomes fully established.
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Affiliation(s)
- Kathleen E McGrath
- Center for Human Genetics and Molecular Pediatric Diseases, Department of Pediatrics, University of Rochester, NY, USA.
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36
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Miano JM. Mammalian smooth muscle differentiation: origins, markers and transcriptional control. Results Probl Cell Differ 2003; 38:39-59. [PMID: 12132398 DOI: 10.1007/978-3-540-45686-5_2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Joseph M Miano
- Center for Cardiovascular Research, Box 679, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, New York 14642, USA
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37
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Hoggatt AM, Simon GM, Herring BP. Cell-specific regulatory modules control expression of genes in vascular and visceral smooth muscle tissues. Circ Res 2002; 91:1151-9. [PMID: 12480816 DOI: 10.1161/01.res.0000047508.30800.4f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A novel approach with chimeric SM22alpha/telokin promoters was used to identify gene regulatory modules that are required for regulating the expression of genes in distinct smooth muscle tissues. Conventional deletion or mutation analysis of promoters does not readily distinguish regulatory elements that are required for basal gene expression from those required for expression in specific smooth muscle tissues. In the present study, the mouse telokin gene was isolated, and a 370-bp (-190 to 180) minimal promoter was identified that directs visceral smooth muscle-specific expression in vivo in transgenic mice. The visceral smooth muscle-specific expression of the telokin promoter transgene is in marked contrast to the reported arterial smooth muscle-specific expression of a 536-bp minimal SM22alpha (-475 to 61) promoter transgene. To begin to identify regulatory elements that are responsible for the distinct tissue-specific expression of these promoters, a chimeric promoter in which a 172-bp SM22alpha gene fragment (-288 to -116) was fused to the minimal telokin promoter was generated and characterized. The -288 to -116 SM22alpha gene fragment significantly increased telokin promoter activity in vascular smooth muscle cells in vitro and in vivo. Conversely, a fragment of the telokin promoter (-94 to -49) increased the activity of the SM22alpha promoter in visceral smooth muscle cells of the bladder. Together, these data demonstrate that both vascular- and visceral smooth muscle-specific regulatory modules direct gene expression in subsets of smooth muscle tissues.
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MESH Headings
- AT Rich Sequence/physiology
- Animals
- Animals, Newborn
- Brain/metabolism
- Cells, Cultured
- Fibroblasts/cytology
- Fibroblasts/metabolism
- Gene Expression Regulation/physiology
- Gene Targeting
- Genes, Reporter
- Mice
- Mice, Transgenic
- Microfilament Proteins/genetics
- Molecular Sequence Data
- Muscle Proteins/genetics
- Muscle, Smooth/cytology
- Muscle, Smooth/metabolism
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Myosin-Light-Chain Kinase
- Organ Specificity
- Peptide Fragments
- Peptides
- Promoter Regions, Genetic/genetics
- Regulatory Sequences, Nucleic Acid/genetics
- Sequence Analysis, DNA
- Transfection
- Transgenes
- Urinary Bladder/metabolism
- Viscera/metabolism
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Affiliation(s)
- April M Hoggatt
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis 46202, USA
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38
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Kaneko M, Takeoka M, Oguchi M, Koganehira Y, Murata H, Ehara T, Tozuka M, Saida T, Taniguchi S. Calponin h1 suppresses tumor growth of Src-induced transformed 3Y1 cells in association with a decrease in angiogenesis. Jpn J Cancer Res 2002; 93:935-43. [PMID: 12716472 PMCID: PMC5927104 DOI: 10.1111/j.1349-7006.2002.tb01340.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Calponin h1 (CNh1) is a basic actin-binding protein that is abundantly expressed in smooth muscle cells and involved in smooth muscle contraction by inhibiting actomyosin MgATPase. In recent studies, CNh1 was noted to suppress cell proliferation and tumorigenicity in leiomyosarcoma and tumor growth in fibrosarcoma cell lines. To further investigate the function of CNh1 as a tumor suppressor, we transfected the human CNh1 gene into a v-src-transformed rat fibroblast cell line SR-3Y1. The volume of the tumors derived from one randomly selected CNh1-transfectant (C1) in nude mice was reduced to 34.1% of that from a randomly selected vector transfectant (V1). A similar tendency was observed in another independent pair (C2, V2). Pathological analysis showed a significant decrease in the number of mitotic cells in the CNh1-transfectants. Further, a marked reduction in the number of vessels in the CNh1-transfectant was observed. DNA synthesis under conditions without serum was significantly reduced in the CNh1-transfectant (C1) compared with the control transfectant (V1), while no significant difference was seen in the cellular growth in the presence of 10% serum. A slight but significant reduction in in vitro cellular motility in the CNh1-transfectant was also observed. While the suppression of growth potential and cell motility by CNh1 transfer was significant but partial, a marked reduction in vascular endothelial growth factor (VEGF) mRNA and the secretion of VEGF protein was observed in the CNh1-transfectant. These results suggest that CNh1 plays a role as tumor suppressor in SR-3Y1 mainly by decreasing VEGF expression and angiogenesis in vivo and partially through reducing cellular proliferative potential and cell motility.
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Affiliation(s)
- Miwako Kaneko
- Department of Dermatology, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
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39
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Condon J, Yin S, Mayhew B, Word RA, Wright WE, Shay JW, Rainey WE. Telomerase immortalization of human myometrial cells. Biol Reprod 2002; 67:506-14. [PMID: 12135889 DOI: 10.1095/biolreprod67.2.506] [Citation(s) in RCA: 121] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Several strategies have been described for the primary culture of human myometrial cells. However, primary cultures of myometrial cells have a limited life span, making continual tissue acquisition and cell isolation necessary. Recent studies have demonstrated that cell culture life span is related to chromosomal telomere length, and cellular senescence results from progressive telomere shortening and the lack of telomerase expression. Transfection of cells with expression vectors containing the human telomerase reverse transcriptase (hTERT) maintains telomere length and effectively gives normal cells an unlimited life span in culture. In addition, hTERT extends the life span of cultured cells far beyond normal senescence without causing neoplastic transformation. In the present study, we developed a cell line from hTERT-infected myometrial cells (hTERT-HM). Cells were isolated from myometrial tissue obtained from women undergoing hysterectomy, and retroviral infection was used to express the catalytic subunit of telomerase in myometrial cells. Cells expressing hTERT have been in continuous culture for >10 mo, whereas the control culture senesced after approximately 2 mo. Telomerase activity was monitored in cells with a polymerase chain reaction-based telomerase activity assay. Telomerase-expressing cells contained mRNA for alpha smooth muscle actin, smoothelin, oxytocin receptor, and estrogen receptor alpha, but the estrogen receptor beta receptor was lost. Immunoblotting analysis identified the expression of calponin, caldesmon, alpha smooth muscle actin, and oxytocin receptor. Although estrogen receptor expression was below the level of detection with immunoblotting, transfection experiments performed with reporter constructs driven by estrogen response elements demonstrated estrogen responsiveness in the hTERT-HM. In addition, treatment of hTERT-HM with oxytocin caused a concentration-dependent increase in intracellular calcium levels, confirming the presence of functional oxytocin receptors. Myometrial cells immortalized with hTERT retained markers of differentiation that are observed in primary cultures of smooth muscle cells. The expression of various smooth muscle/myometrium cell markers suggests that these cells may be an appropriate model system to study certain aspects of human myometrial function.
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Affiliation(s)
- Jennifer Condon
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9032, USA
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40
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Zhang JCL, Helmke BP, Shum A, Du K, Yu WW, Lu MM, Davies PF, Parmacek MS. SM22beta encodes a lineage-restricted cytoskeletal protein with a unique developmentally regulated pattern of expression. Mech Dev 2002; 115:161-6. [PMID: 12049783 DOI: 10.1016/s0925-4773(02)00088-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Cytoskeletal proteins play important roles in regulating cellular morphology, cytokinesis and intracellular signaling. In this report, we describe a developmentally regulated gene encoding a novel cell lineage-restricted cytoskeletal protein, designated SM22beta. SM22beta shares high-grade sequence identity with the smooth muscle cell (SMC)-specific protein, SM22alpha, the neuron-specific protein, NP25, and the Drosophila melanogaster flight muscle-specific protein, mp20. The mouse SM22beta cDNA encodes a 199-amino acid polypeptide that contains a single conserved calponin-like repeat domain. During mouse embryonic development, the SM22beta gene is expressed in a temporally and spatially regulated pattern in the tunica media of arteries and veins, endocardium and compact layer of the myocardium, bronchial epithelium and mesenchyme of the lung, gastrointestinal epithelium and cartilaginous primordia. During postnatal development, SM22beta is co-expressed with SM22alpha in arterial and venous SMCs. In addition, SM22beta is expressed at high levels in the bronchial epithelium and lung mesenchyme, gastrointestinal epithelial cells and in the cartilagenous and periosteal layer of bones. Three-dimensional deconvolution microscopic analyses of A7r5 SMCs revealed that SM22beta co-localizes with SM22alpha to cytoskeletal actin filaments. Taken together, these data demonstrate that SM22beta is a novel actin-associated protein with a unique cell lineage-restricted pattern of expression.
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Affiliation(s)
- Janet C L Zhang
- Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104-4283, USA
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41
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Abstract
With the advent of molecular embryology and exploitation of genetic models systems, many genes necessary for normal blood vessel formation during early development have been identified. These genes include soluble effectors and their receptors, as well as components of cell-cell junctions and mediators of cell-matrix interactions. In vitro model systems (2-D and 3-D) to study paracrine and autocrine interactions of vascular cells and their progenitors have also been created. These systems are being combined to study the behavior of genetically altered cells to dissect and define the cellular role(s) of specific genes and gene families in directing the migration, proliferation, and differentiation needed for blood vessel assembly. It is clear that a complex spatial and temporal interplay of signals, including both genetic and environmental, modulates the assembly process. The development of real-time imaging and image analysis will enable us to gain further insights into this process. Collaborative efforts among vascular biologists, biomedical engineers, mathematicians, and physicists will allow us to bridge the gap between understanding vessel assembly in vivo and assembling vessels ex vivo.
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Affiliation(s)
- Karen K Hirschi
- Departments of Pediatrics and Molecular & Cellular Biology, Baylor College of Medicine, One Baylor Plaza, N1030, Houston, TX 77030, USA.
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42
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Miano JM, Kitchen CM, Chen J, Maltby KM, Kelly LA, Weiler H, Krahe R, Ashworth LK, Garcia E. Expression of human smooth muscle calponin in transgenic mice revealed with a bacterial artificial chromosome. Am J Physiol Heart Circ Physiol 2002; 282:H1793-803. [PMID: 11959645 DOI: 10.1152/ajpheart.00875.2001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Defining regulatory elements governing cell-restricted gene expression can be difficult because cis-elements may reside tens of kilobases away from start site(s) of transcription. Artificial chromosomes, which harbor hundreds of kilobases of genomic DNA, preserve a large sequence landscape containing most, if not all, regulatory elements controlling the expression of a particular gene. Here, we report on the use of a bacterial artificial chromosome (BAC) to begin understanding the in vivo regulation of smooth muscle calponin (SM-Calp). Long and accurate polymerase chain reaction, sequencing, and in silico analyses facilitated the complete sequence annotation of a BAC harboring human SM-Calp (hSM-Calp). RNase protection, in situ hybridization, Western blotting, and immunohistochemistry assays showed the BAC clone faithfully expressed hSM-Calp in both cultured cells and transgenic mice. Moreover, expression of hSM-Calp mirrored that of endogenous mouse SM-Calp suggesting that all cis-regulatory elements governing hSM-Calp expression in vivo were contained within the BAC. These BAC mice represent a new model system in which to systematically assess regulatory elements governing SM-Calp transcription in vivo.
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Affiliation(s)
- Joseph M Miano
- Center for Cardiovascular Research, University of Rochester Medical Center, Rochester, New York 14642, USA.
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43
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Hirschi KK, Lai L, Belaguli NS, Dean DA, Schwartz RJ, Zimmer WE. Transforming growth factor-beta induction of smooth muscle cell phenotpye requires transcriptional and post-transcriptional control of serum response factor. J Biol Chem 2002; 277:6287-95. [PMID: 11741973 PMCID: PMC4421896 DOI: 10.1074/jbc.m106649200] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Transforming growth factor-beta induces a smooth muscle cell phenotype in undifferentiated mesenchymal cells. To elucidate the mechanism(s) of this phenotypic induction, we focused on the molecular regulation of smooth muscle-gamma-actin, whose expression is induced at late stages of smooth muscle differentiation and developmentally restricted to this lineage. Transforming growth factor-beta induced smooth muscle-gamma-actin protein, cytoskeletal localization, and mRNA expression in mesenchymal cells. Smooth muscle-gamma-actin promoter-luciferase reporter activity was enhanced by transforming growth factor-beta, and deletion analysis revealed that CArG box 2 in the promoter was necessary for this transcriptional activation. CArG motifs bind transcriptional activator serum response factor; gel shift analyses revealed increased binding of serum response factor-containing complexes to this site in response to transforming growth factor-beta, paralleled by increased serum response factor protein expression. Serum response factor expression was found to be up-regulated by transforming growth factor-beta via transcriptional activation of the gene and post-transcriptional regulation. Using mesenchymal cells stably transfected with wild type or dominant-negative serum response factor, we demonstrated that its expression is sufficient for induction of a smooth muscle phenotype in mesenchymal cells and is necessary for transforming growth factor-beta-mediated smooth muscle induction.
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Affiliation(s)
- Karen K Hirschi
- Department of Pediatrics, Center for Cell and Gene Therapy and Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas 77030, USA.
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44
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Sugenoya Y, Yoshimura A, Yamamura H, Inui K, Morita H, Yamabe H, Ueki N, Ideura T, Takahashi K. Smooth-muscle calponin in mesangial cells: regulation of expression and a role in suppressing glomerulonephritis. J Am Soc Nephrol 2002; 13:322-331. [PMID: 11805159 DOI: 10.1681/asn.v132322] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The basic or h1 calponin gene, which encodes an actin-binding protein involved in the regulation of smooth-muscle shortening velocity, is known to be a smooth-muscle differentiation-specific gene. It was found that basic calponin was expressed by cultured mesangial cells and localized along the actin filaments. Among the growth factors involved in the mesangial cell pathophysiology, including platelet-derived growth factor-BB (PDGF-BB), tumor necrosis factor-alpha (TNF-alpha), and transforming growth factor-beta1 (TGF-beta1), TNF-alpha potently downregulates basic calponin expression in both the mRNA and protein levels, whereas TGF-beta1 upregulates the calponin expression. PDGF-BB also reduced its mRNA expression. The half-life of basic calponin mRNA was determined to be similar between TNF-alpha-treated and -untreated mesangial cells, whereas cell transfection assays that used a luciferase reporter gene construct containing the functional basic calponin promoter showed that TNF-alpha and PDGF-BB reduced the transcriptional activity. Because stimulation with TNF-alpha and PDGF-BB was associated with mesangial cell proliferation, basic calponin may play a role in the suppression of mesangial cell proliferation. Treatment with anti-glomerular basement membrane antibody in calponin knockout mice induced more severe nephritis than in wild type mice, as judged from an increase in the urinary protein excretion, glomerular cellularity, and number of proliferating cell nuclear antigen-positive cells in glomerulus. These results suggest that basic calponin expression may serve as one of the intrinsic regulators of glomerular nephritis. Elucidation of the molecular mechanisms for regulation of the basic calponin expression in mesangial cells may improve the understanding of the molecular basis and pathogenesis of the glomerular response to injury.
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Affiliation(s)
- Youichi Sugenoya
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Ashio Yoshimura
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Hisako Yamamura
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Kiyoko Inui
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Hiroyuki Morita
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Hideaki Yamabe
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Noboru Ueki
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Terukuni Ideura
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
| | - Katsuhito Takahashi
- *Department of Medicine and Pathophysiology, Division of Nephrology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Japan; Department of Molecular Medicine and Pathophysiology, Osaka Medical Center for Cancer and Cardiovascular Diseases, The Graduate School of Pharmaceutical Science, Osaka University, SORST, Japan Science and Technology Corporation, Higashinari-ku, Osaka City, Japan; Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki, Japan; Third Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan
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Takeoka M, Ehara T, Sagara J, Hashimoto S, Taniguchi S. Calponin h1 induced a flattened morphology and suppressed the growth of human fibrosarcoma HT1080 cells. Eur J Cancer 2002; 38:436-42. [PMID: 11818211 DOI: 10.1016/s0959-8049(01)00390-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Calponin h1 (CNh1) is an actin-binding protein that is expressed mainly in smooth muscle cells and is known to regulate smooth muscle contraction. Recently, re-expression of CNh1 in leiomyosarcoma cell lines is reported to suppress cell proliferation and tumorigenicity. However, little is known about the associated cellular structural and functional changes. Since CNh1 is also detected in normal fibroblasts, we hypothesised that CNh1 would also inhibit cell proliferation of the fibrosarcoma cells, HT1080, in which CNh1 is suppressed. An expression vector of human CNh1 complementary DNA was transfected into human HT1080 cells by a calcium-phosphate precipitation method. CNh1-transfected cells exhibited a flattened morphology with organised actin filaments, a significant decrease in cell motility and enhancement in adhesion to fibronectin in association with an increase in integrin alpha5beta1 expression. Anchorage-independent growth and tumorigenicity in nude mice were suppressed in the CNh1-transfected cells. Our results suggest that CNh1 may have a role as a tumour suppressor in human fibrosarcoma by influencing cytoskeletal activities.
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Affiliation(s)
- M Takeoka
- Department of Molecular Oncology and Angiology, Research Center on Aging and Adaptation, Shinshu University School of Medicine, 3-1-1 Asahi, 390-8621, Matsumoto, Japan.
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47
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Young JL, Dean DA. Nonviral gene transfer strategies for the vasculature. Microcirculation 2002; 9:35-49. [PMID: 11896558 PMCID: PMC4403639 DOI: 10.1038/sj/mn/7800120] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2001] [Accepted: 10/11/2001] [Indexed: 12/24/2022]
Abstract
Major attention has been focused on the development of gene therapy approaches for the treatment of vascular diseases. In this review, we focus on an alternative use of gene therapy: the use of genetic means to study vascular cell biology and physiology. Both viral and nonviral gene transfer strategies have limitations, but because of the overwhelming inflammatory responses associated with the use of viral vectors, nonviral gene transfer methods are likely to be used more abundantly for future applications in the vasculature. Researchers have made great strides in the advancement of gene delivery to the vasculature in vivo. However, the efficiency of gene transfer seen with most nonviral approaches has been exceedingly low. We discuss how to circumvent and take advantage of a number of the barriers that limit efficient gene delivery to the vasculature to achieve high-level gene expression in appropriate cell types within the vessel wall. With such levels of expression, gene transfer offers the ability to alter pathways at the molecular level by genetically modulating the activity of a gene product, thus obviating the need to rely on pharmacological agents and their foreseen and unforeseen side effects. This genetic ability to alter distinct gene products within a signaling or biosynthetic pathway or to alter structural interactions within and between cells is extremely useful and technologically possible today. Hopefully, with the availability of these tools, new advances in cardiovascular physiology will emerge.
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Affiliation(s)
- Jennifer L Young
- Division of Pulmonary and Critical Care Medicine, Northwestern University Medical School, Chicago, IL 60611, USA
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48
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Dulin NO, Orlov SN, Kitchen CM, Voyno-Yasenetskaya TA, Miano JM. G-protein-coupled-receptor activation of the smooth muscle calponin gene. Biochem J 2001; 357:587-92. [PMID: 11439113 PMCID: PMC1221990 DOI: 10.1042/0264-6021:3570587] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A hallmark of cultured smooth muscle cells (SMCs) is the rapid down-regulation of several lineage-restricted genes that define their in vivo differentiated phenotype. Identifying factors that maintain an SMC differentiated phenotype has important implications in understanding the molecular underpinnings governing SMC differentiation and their subversion to an altered phenotype in various disease settings. Here, we show that several G-protein coupled receptors [alpha-thrombin, lysophosphatidic acid and angiotensin II (AII)] increase the expression of smooth muscle calponin (SM-Calp) in rat and human SMC. The increase in SM-Calp protein appears to be selective for G-protein-coupled receptors as epidermal growth factor was without effect. Studies using AII showed a 30-fold increase in SM-Calp protein, which was dose- and time-dependent and mediated by the angiotensin receptor-1 (AT1 receptor). The increase in SM-Calp protein with AII was attributable to transcriptional activation of SM-Calp based on increases in steady-state SM-Calp mRNA, increases in SM-Calp promoter activity and complete abrogation of protein induction with actinomycin D. To examine the potential role of extracellular signal-regulated kinase (Erk1/2), protein kinase B, p38 mitogen-activated protein kinase and protein kinase C in AII-induced SM-Calp, inhibitors to each of the signalling pathways were used. None of these signalling molecules appears to be crucial for AII-induced SM-Calp expression, although Erk1/2 may be partially involved. These results identify SM-Calp as a target of AII-mediated signalling, and suggest that the SMC response to AII may incorporate a novel activity of SM-Calp.
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MESH Headings
- Animals
- Aorta
- Calcium-Binding Proteins/genetics
- Cell Differentiation
- Cells, Cultured
- Enzyme Inhibitors/pharmacology
- Flavonoids/pharmacology
- GTP-Binding Proteins/metabolism
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/physiology
- Genes, Reporter
- Humans
- Luciferases/genetics
- Microfilament Proteins
- Mitogen-Activated Protein Kinases/metabolism
- Muscle Proteins/genetics
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Phosphorylation
- RNA, Messenger/genetics
- Rats
- Rats, Inbred WKY
- Receptors, Cytoplasmic and Nuclear/metabolism
- Transcription, Genetic/drug effects
- Transcription, Genetic/physiology
- Transfection
- p38 Mitogen-Activated Protein Kinases
- Calponins
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Affiliation(s)
- N O Dulin
- Department of Pharmacology, University of Illinois at Chicago, 835 South Wolcott Avenue, Chicago, IL 60612, USA
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Kawanabe Y, Okamoto Y, Hashimoto N, Masaki T. Characterization of Ca(2+) channels involved in endothelin-1-induced mitogenic responses in vascular smooth muscle cells. Eur J Pharmacol 2001; 422:15-21. [PMID: 11430908 DOI: 10.1016/s0014-2999(01)01052-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Ca(2+) channels involved in the endothelin-1-induced mitogenic response of cultured rat thoracic aorta smooth muscle cells, A7r5 cells, were characterized using the Ca(2+) channel blockers, LOE 908 and SK&F 96365. Stimulation of A7r5 cells with endothelin-1 induced a mitogenic response as well as a biphasic increase in the intracellular-free Ca(2+) concentration. Based on the sensitivity to nifedipine, a specific blocker of L-type voltage-operated Ca(2+) channel (VOCC), Ca(2+) influx through VOCC has a minor role in endothelin-1-induced mitogenic responses. On the other hand, Ca(2+) influx through voltage-independent Ca(2+) channels (VICCs) plays an important part in endothelin-1-induced mitogenesis. Moreover, based on their sensitivity to SK&F 96365 and LOE 908, VICCs consist of two types of Ca(2+)-permeable nonselective cation channels (designated NSCC-1 and NSCC-2) and a store-operated Ca(2+) channel (SOCC). Ca(2+) influx through NSCC-1, NSCC-2 and SOCC contributes to 35%, 30% and 35%, respectively, to the nifedipine-resistant component of the endothelin-1 mitogenic response.
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Affiliation(s)
- Y Kawanabe
- Department of Neurosurgery, Faculty of Medicine, Kyoto University, Kyoto, Japan.
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50
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Stone CH, Lee MW, Amin MB, Yaziji H, Gown AM, Ro JY, Têtu B, Paraf F, Zarbo RJ. Renal angiomyolipoma: further immunophenotypic characterization of an expanding morphologic spectrum. Arch Pathol Lab Med 2001; 125:751-8. [PMID: 11371226 DOI: 10.5858/2001-125-0751-ra] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Renal angiomyolipoma is a benign tumor histologically characterized by proliferation of spindle cells, epithelioid cells, and adipocytic cells in concert with many thick-walled blood vessels. To add further diagnostic confusion, an epithelioid cell-predominant variant of renal angiomyolipoma has recently been described. HMB-45 immunoreactivity correlates with ultrastructural striated organelles that closely resemble premelanosomes, although no evidence of melanogenesis has been documented in this tumor. OBJECTIVE To further characterize the immunophenotypic and ultrastructural profile of renal angiomyolipoma based on phenotypic cell type (epithelioid, spindle, and adipocytic cell). DESIGN Formalin-fixed, paraffin-embedded tissues from 27 renal angiomyolipomas and 8 renal cell carcinomas were immunostained with monoclonal antibodies to the melanoma-associated antigens HMB-45, HMB-50, NKI/C3 (CD63), and tyrosinase; the smooth muscle-related antigens calponin and muscle-specific actin (HHF-35); S100; and cytokeratin (CK). All renal angiomyolipomas were also immunostained with a polyclonal antibody to renin. Ultrastructural examination was performed on 9 selected cases. RESULTS All renal angiomyolipomas stained positive for HMB-45, HMB-50, NKI/C3, muscle-specific actin (HHF-35), and calponin. Overall, HMB-45, HMB-50, and NKI/C3 preferentially stained the epithelioid cells. Tyrosinase staining was present in 50% of the renal angiomyolipomas with adequate tissue for staining (12 of 24 cases); positive staining and intensity paralleled HMB-45, HMB-50, and NKI/C3. Muscle-specific actin (HHF-35) and calponin preferentially stained the spindle cells. The adipocytic cells stained positive for both melanoma-associated antigens and smooth muscle antigens. Epithelioid cells, spindle cells, and adipocytic cells were CK, S100, and renin negative. Ultrastructural findings paralleled immunohistochemical staining patterns. Premelanosome-like organelles and electron dense granules were more readily detected in the epithelioid cells within the tumor, whereas ultrastructural characteristics of smooth muscle cells were more easily found in the spindle cells. All renal cell carcinomas stained positive for CK, NKI/C3 staining was variable, and all were negative for HMB-45, HMB-50, smooth muscle actin (HHF-35), and calponin. CONCLUSION In renal angiomyolipoma, the epithelioid and spindle cells have preferential staining patterns for melanoma-associated antigens versus smooth muscle antigens, respectively. Positivity in renal angiomyolipoma for HMB-50, NKI/C3, and tyrosinase, in addition to HMB-45, provides evidence for the presence of different melanoma-associated gene products. Immunophenotypic overlap of the 3 histologically distinct renal angiomyolipoma cell populations suggests a common cell line, supporting a unitarian concept for renal angiomyolipoma. Ultrastructural characteristics of the 3 renal angiomyolipoma cell phenotypes parallel the immunophenotype, giving further support to a common cell line. Our study lends further credence to the perivascular epithelioid cell concept as proposed by Bonetti and colleagues.
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Affiliation(s)
- C H Stone
- Department of Pathology, Henry Ford Hospital, Detroit, MI 48202, USA.
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