51
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Toyama T, Looney AP, Baker BM, Stawski L, Haines P, Simms R, Szymaniak AD, Varelas X, Trojanowska M. Therapeutic Targeting of TAZ and YAP by Dimethyl Fumarate in Systemic Sclerosis Fibrosis. J Invest Dermatol 2017; 138:78-88. [PMID: 28870693 DOI: 10.1016/j.jid.2017.08.024] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 12/11/2022]
Abstract
Systemic sclerosis (scleroderma, SSc) is a devastating fibrotic disease with few treatment options. Fumaric acid esters, including dimethyl fumarate (DMF, Tecfidera; Biogen, Cambridge, MA), have shown therapeutic effects in several disease models, prompting us to determine whether DMF is effective as a treatment for SSc dermal fibrosis. We found that DMF blocks the profibrotic effects of transforming growth factor-β (TGFβ) in SSc skin fibroblasts. Mechanistically, we found that DMF treatment reduced nuclear localization of transcriptional coactivator with PDZ binding motif (TAZ) and Yes-associated protein (YAP) proteins via inhibition of the phosphatidylinositol 3 kinase/protein kinase B (Akt) pathway. In addition, DMF abrogated TGFβ/Akt1 mediated inhibitory phosphorylation of glycogen kinase 3β (GSK3β) and a subsequent β-transducin repeat-containing proteins (βTRCP) mediated proteasomal degradation of TAZ, as well as a corresponding decrease of TAZ/YAP transcriptional targets. Depletion of TAZ/YAP recapitulated the antifibrotic effects of DMF. We also confirmed the increase of TAZ/YAP in skin biopsies from patients with diffuse SSc. We further showed that DMF significantly diminished nuclear TAZ/YAP localization in fibroblasts cultured on a stiff surface. Importantly, DMF prevented bleomycin-induced skin fibrosis in mice. Together, our work demonstrates a mechanism of the antifibrotic effect of DMF via inhibition of Akt1/GSK3β/TAZ/YAP signaling and confirms a critical role of TAZ/YAP in mediating the profibrotic responses in dermal fibroblasts. This study supports the use of DMF as a treatment for SSc dermal fibrosis.
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Affiliation(s)
- Tetsuo Toyama
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Agnieszka P Looney
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Brendon M Baker
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, USA
| | - Lukasz Stawski
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Paul Haines
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Robert Simms
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Aleksander D Szymaniak
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Xaralabos Varelas
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Maria Trojanowska
- Arthritis Center, Boston University School of Medicine, Boston, Massachusetts, USA.
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52
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Kaan HYK, Chan SW, Tan SKJ, Guo F, Lim CJ, Hong W, Song H. Crystal structure of TAZ-TEAD complex reveals a distinct interaction mode from that of YAP-TEAD complex. Sci Rep 2017; 7:2035. [PMID: 28515457 PMCID: PMC5435683 DOI: 10.1038/s41598-017-02219-9] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 04/07/2017] [Indexed: 12/12/2022] Open
Abstract
The Hippo pathway is a tumor suppressor pathway that is implicated in the regulation of organ size. The pathway has three components: the upstream regulatory factors, the kinase core, and the downstream transcriptional machinery, which consists of YAP, TAZ (transcription co-activators) and TEAD (transcription factor). Formation of YAP/TAZ-TEAD complexes leads to the transcription of growth-promoting genes. Herein, we report the crystal structure of TAZ-TEAD4 complex, which reveals two binding modes. The first is similar to the published YAP-TEAD structure. The second is a unique binding mode, whereby two molecules of TAZ bind to and bridge two molecules of TEAD4. We validated the latter using cross-linking and multi-angle light scattering. Using siRNA, we showed that TAZ knockdown leads to a decrease in TEAD4 dimerization. Lastly, results from luciferase assays, using YAP/TAZ transfected or knockdown cells, give support to the non-redundancy of YAP/TAZ co-activators in regulating gene expression in the Hippo pathway.
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Affiliation(s)
- Hung Yi Kristal Kaan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Siew Wee Chan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Siew Kim Joyce Tan
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Fusheng Guo
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Chun Jye Lim
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore
| | - Wanjin Hong
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore.
| | - Haiwei Song
- Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Resesarch), 61 Biopolis Drive, Singapore, 138673, Singapore. .,Department of Biochemistry, National University of Singapore, 14 Science Drive, Singapore, 117543, Singapore.
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53
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YAP regulates cell mechanics by controlling focal adhesion assembly. Nat Commun 2017; 8:15321. [PMID: 28504269 PMCID: PMC5440673 DOI: 10.1038/ncomms15321] [Citation(s) in RCA: 376] [Impact Index Per Article: 53.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 03/10/2017] [Indexed: 12/16/2022] Open
Abstract
Hippo effectors YAP/TAZ act as on–off mechanosensing switches by sensing modifications in extracellular matrix (ECM) composition and mechanics. The regulation of their activity has been described by a hierarchical model in which elements of Hippo pathway are under the control of focal adhesions (FAs). Here we unveil the molecular mechanism by which cell spreading and RhoA GTPase activity control FA formation through YAP to stabilize the anchorage of the actin cytoskeleton to the cell membrane. This mechanism requires YAP co-transcriptional function and involves the activation of genes encoding for integrins and FA docking proteins. Tuning YAP transcriptional activity leads to the modification of cell mechanics, force development and adhesion strength, and determines cell shape, migration and differentiation. These results provide new insights into the mechanism of YAP mechanosensing activity and qualify this Hippo effector as the key determinant of cell mechanics in response to ECM cues. The transcriptional co-activator YAP is known to operate downstream of mechanical signals arising from the cell niche. Here the authors demonstrate that YAP controls cell mechanics, force development and adhesion strength by promoting the transcription of genes related to focal adhesions.
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54
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Mohamed A, Sun C, De Mello V, Selfe J, Missiaglia E, Shipley J, Murray GI, Zammit PS, Wackerhage H. The Hippo effector TAZ (WWTR1) transforms myoblasts and TAZ abundance is associated with reduced survival in embryonal rhabdomyosarcoma. J Pathol 2017; 240:3-14. [PMID: 27184927 PMCID: PMC4995731 DOI: 10.1002/path.4745] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 04/04/2016] [Accepted: 04/27/2016] [Indexed: 12/22/2022]
Abstract
The Hippo effector YAP has recently been identified as a potent driver of embryonal rhabdomyosarcoma (ERMS). Most reports suggest that the YAP paralogue TAZ (gene symbol WWTR1) functions as YAP but, in skeletal muscle, TAZ has been reported to promote myogenic differentiation, whereas YAP inhibits it. Here, we investigated whether TAZ is also a rhabdomyosarcoma oncogene or whether TAZ acts as a YAP antagonist. Immunostaining of rhabdomyosarcoma tissue microarrays revealed that TAZ is significantly associated with poor survival in ERMS. In 12% of fusion gene‐negative rhabdomyosarcomas, the TAZ locus is gained, which is correlated with increased expression. Constitutively active TAZ S89A significantly increased proliferation of C2C12 myoblasts and, importantly, colony formation on soft agar, suggesting transformation. However, TAZ then switches to enhance myogenic differentiation in C2C12 myoblasts, unlike YAP. Conversely, lentiviral shRNA‐mediated TAZ knockdown in human ERMS cells reduced proliferation and anchorage‐independent growth. While TAZ S89A or YAP1 S127A similarly activated the 8XGTIIC–Luc Hippo reporter, only YAP1 S127A activated the Brachyury (T‐box) reporter. Consistent with its oncogene function, TAZ S89A induced expression of the ERMS cancer stem cell gene Myf5 and the serine biosynthesis pathway (Phgdh, Psat1, Psph) in C2C12 myoblasts. Thus, TAZ is associated with poor survival in ERMS and could act as an oncogene in rhabdomyosarcoma. © 2016 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Abdalla Mohamed
- School of Medicine, Dentistry and Nutrition, University of Aberdeen, UK
| | - Congshan Sun
- Randall Division of Cell and Molecular Biophysics, King's College London, UK
| | - Vanessa De Mello
- School of Medicine, Dentistry and Nutrition, University of Aberdeen, UK
| | - Joanna Selfe
- Sarcoma Molecular Pathology Team, Divisions of Molecular Pathology and Cancer Therapeutics, Institute of Cancer Research, London, UK
| | | | - Janet Shipley
- Sarcoma Molecular Pathology Team, Divisions of Molecular Pathology and Cancer Therapeutics, Institute of Cancer Research, London, UK
| | - Graeme I Murray
- School of Medicine, Dentistry and Nutrition, University of Aberdeen, UK
| | - Pete S Zammit
- Randall Division of Cell and Molecular Biophysics, King's College London, UK
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55
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Gibault F, Bailly F, Corvaisier M, Coevoet M, Huet G, Melnyk P, Cotelle P. Molecular Features of the YAP Inhibitor Verteporfin: Synthesis of Hexasubstituted Dipyrrins as Potential Inhibitors of YAP/TAZ, the Downstream Effectors of the Hippo Pathway. ChemMedChem 2017; 12:954-961. [PMID: 28334506 DOI: 10.1002/cmdc.201700063] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 03/17/2017] [Indexed: 12/22/2022]
Abstract
Porphyrin derivatives, in particular verteporfin (VP), a photosensitizer initially designed for cancer therapy, have been identified as inhibitors of the YAP-TEAD interaction and transcriptional activity. Herein we report the efficient convergent synthesis of the dipyrrin half of protoporphyrin IX dimethyl ester (PPIX-DME), in which the sensitive vinyl group was created at the final stage by a dehydroiodination reaction. Two other dipyrrin derivatives were synthesized, including dipyrrin 19 [(Z)-2-((3,5-dimethyl-4-vinyl-2H-pyrrol-2-ylidene)methyl)-3,5-dimethyl-4-vinyl-1H-pyrrole], containing two vinyl groups. We found that VP and dipyrrin 19 showed significant inhibitory effects on TEAD transcriptional activity in MDA-MB-231 human breast cancer cells, whereas other compounds did not show significant changes. In addition, we observed a marked decrease in both YAP and TAZ levels following VP treatment, whereas dipyrrin 19 treatment primarily decreased the levels of YAP and receptor kinase AXL, a downstream target of YAP. Together, our data suggest that, due to their chemical structures, porphyrin- and dipyrrin-related derivatives can directly target YAP and/or TAZ proteins and inhibit TEAD transcriptional activity.
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Affiliation(s)
- Floriane Gibault
- Department of Onco and NeuroChemistry, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, 3, rue du professeur Laguesse, BP 83, 59006, Lille Cedex, France
| | - Fabrice Bailly
- Department of Onco and NeuroChemistry, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, 3, rue du professeur Laguesse, BP 83, 59006, Lille Cedex, France
| | - Matthieu Corvaisier
- Department of Mucins, Epithelial Differentiation and Carcinogenesis, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, Bâtiment Biserte, 1, place de Verdun, 59045, Lille Cedex, France
| | - Mathilde Coevoet
- Department of Onco and NeuroChemistry, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, 3, rue du professeur Laguesse, BP 83, 59006, Lille Cedex, France
| | - Guillemette Huet
- Department of Mucins, Epithelial Differentiation and Carcinogenesis, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, Bâtiment Biserte, 1, place de Verdun, 59045, Lille Cedex, France
| | - Patricia Melnyk
- Department of Onco and NeuroChemistry, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, 3, rue du professeur Laguesse, BP 83, 59006, Lille Cedex, France
| | - Philippe Cotelle
- Department of Onco and NeuroChemistry, University of Lille, INSERM UMR-S 1172, Jean-Pierre Aubert Research Center, 3, rue du professeur Laguesse, BP 83, 59006, Lille Cedex, France
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56
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Tang Y, Weiss SJ. Snail/Slug-YAP/TAZ complexes cooperatively regulate mesenchymal stem cell function and bone formation. Cell Cycle 2017; 16:399-405. [PMID: 28112996 DOI: 10.1080/15384101.2017.1280643] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Snail and Slug are zinc-finger transcription factors that play key roles in directing the epithelial-mesenchymal transition (EMT) programs associated with normal development as well as disease progression. More recent work suggests that these EMT-associated transcription factors also modulate the function of both embryonic and adult stem cells. Interestingly, YAP and TAZ, the co-transcriptional effectors of the Hippo pathway, likewise play an important role in stem cell self-renewal and lineage commitment. While direct intersections between the Snail/Slug and Hippo pathways have not been described previously, we recently described an unexpected cooperative interaction between Snail/Slug and YAP/TAZ that controls the self-renewal and differentiation properties of bone marrow-derived mesenchymal stem cells (MSCs), a cell population critical to bone development. Additional studies revealed that both Snail and Slug are able to form binary complexes with either YAP or TAZ that, together, control YAP/TAZ transcriptional activity and function throughout mouse development. Given the more recent observations that MSC-like cell populations are found in association throughout the vasculature where they participate in tissue regeneration, fibrosis and cancer, the Snail/Slug-YAP/TAZ axis is well-positioned to regulate global stem cell function in health and disease.
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Affiliation(s)
- Yi Tang
- a Division of Molecular Medicine and Genetics, Department of Internal Medicine , University of Michigan , Ann Arbor , MI , USA.,b Life Sciences Institute, University of Michigan , Ann Arbor , MI , USA
| | - Stephen J Weiss
- a Division of Molecular Medicine and Genetics, Department of Internal Medicine , University of Michigan , Ann Arbor , MI , USA.,b Life Sciences Institute, University of Michigan , Ann Arbor , MI , USA
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57
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Passaniti A, Brusgard JL, Qiao Y, Sudol M, Finch-Edmondson M. Roles of RUNX in Hippo Pathway Signaling. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 962:435-448. [PMID: 28299672 DOI: 10.1007/978-981-10-3233-2_26] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The Runt-domain (RD) transcription factors (RUNX genes) are an important family of transcriptional mediators that interact with a variety of proteins including the Hippo pathway effector proteins, YAP and TAZ. In this chapter we focus on two examples of RUNX-TAZ/YAP interactions that have particular significance in human cancer. Specifically, recent evidence has found that RUNX2 cooperates with TAZ to promote epithelial to mesenchymal transition mediated by the soluble N-terminal ectodomain of E-Cadherin, sE-Cad. Contrastingly, in gastric cancer, RUNX3 acts as a tumor suppressor via inhibition of the YAP-TEAD complex and disruption of downstream YAP-mediated gene transcription and the oncogenic phenotype. The reports highlighted in this chapter add to the growing repertoire of instances of Hippo pathway crosstalk that have been identified in cancer. Elucidation of these increasingly complex interactions may help to identify novel strategies to target Hippo pathway dysregulation in human cancer.
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Affiliation(s)
- Antonino Passaniti
- Department of Pathology and Marlene & Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, and the Veterans Administration Health Service, Baltimore, MD, USA.
| | - Jessica L Brusgard
- Department of Pathology and Marlene & Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, and the Veterans Administration Health Service, Baltimore, MD, USA
| | - Yiting Qiao
- The Mechanobiology Institute (MBI) and the NUS Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore
| | - Marius Sudol
- The Mechanobiology Institute (MBI) and the NUS Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore
- Institute of Molecular and Cell Biology A*STAR, Singapore, Republic of Singapore
| | - Megan Finch-Edmondson
- The Mechanobiology Institute (MBI) and the NUS Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore
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58
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Seong BKA, Fathers KE, Hallett R, Yung CK, Stein LD, Mouaaz S, Kee L, Hawkins CE, Irwin MS, Kaplan DR. A Metastatic Mouse Model Identifies Genes That Regulate Neuroblastoma Metastasis. Cancer Res 2016; 77:696-706. [PMID: 27899382 DOI: 10.1158/0008-5472.can-16-1502] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 10/06/2016] [Accepted: 11/05/2016] [Indexed: 11/16/2022]
Abstract
Metastatic relapse is the major cause of death in pediatric neuroblastoma, where there remains a lack of therapies to target this stage of disease. To understand the molecular mechanisms mediating neuroblastoma metastasis, we developed a mouse model using intracardiac injection and in vivo selection to isolate malignant cell subpopulations with a higher propensity for metastasis to bone and the central nervous system. Gene expression profiling revealed primary and metastatic cells as two distinct cell populations defined by differential expression of 412 genes and of multiple pathways, including CADM1, SPHK1, and YAP/TAZ, whose expression independently predicted survival. In the metastatic subpopulations, a gene signature was defined (MET-75) that predicted survival of neuroblastoma patients with metastatic disease. Mechanistic investigations demonstrated causal roles for CADM1, SPHK1, and YAP/TAZ in mediating metastatic phenotypes in vitro and in vivo Notably, pharmacologic targeting of SPHK1 or YAP/TAZ was sufficient to inhibit neuroblastoma metastasis in vivo Overall, we identify gene expression signatures and candidate therapeutics that could improve the treatment of metastatic neuroblastoma. Cancer Res; 77(3); 696-706. ©2017 AACR.
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Affiliation(s)
- Bo Kyung A Seong
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
| | - Kelly E Fathers
- Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, Canada
| | - Robin Hallett
- Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, Canada
| | - Christina K Yung
- Informatics and Bio-computing, Ontario Institute of Cancer Research, Toronto, Canada
| | - Lincoln D Stein
- Informatics and Bio-computing, Ontario Institute of Cancer Research, Toronto, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Canada
| | - Samar Mouaaz
- Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, Canada
| | - Lynn Kee
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada
| | - Cynthia E Hawkins
- Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada
| | - Meredith S Irwin
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada. .,Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Canada.,Department of Paediatrics, University of Toronto, Toronto, Canada
| | - David R Kaplan
- Program in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto, Canada. .,Department of Molecular Genetics, University of Toronto, Toronto, Canada
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59
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Wang L, Qiu P, Jiao J, Hirai H, Xiong W, Zhang J, Zhu T, Ma PX, Chen YE, Yang B. Yes-Associated Protein Inhibits Transcription of Myocardin and Attenuates Differentiation of Vascular Smooth Muscle Cell from Cardiovascular Progenitor Cell Lineage. Stem Cells 2016; 35:351-361. [PMID: 27571517 DOI: 10.1002/stem.2484] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 08/10/2016] [Accepted: 08/16/2016] [Indexed: 01/12/2023]
Abstract
Vascular smooth muscle cells (VSMCs) derived from cardiovascular progenitor cell (CVPC) lineage populate the tunica media of the aortic root. Understanding differentiation of VSMCs from CVPC will further our understanding of the molecular mechanisms contributing to aortic root aneurysms, and thus, facilitate the development of novel therapeutic agents to prevent this devastating complication. It is established that the yes-associated protein (YAP) and Hippo pathway is important for VSMC proliferation and phenotype switch. To determine the role of YAP in differentiation of VSMCs from CVPCs, we utilized the in vitro monolayer lineage specific differentiation method by differentiating human embryonic stem cells into CVPCs, and then, into VSMCs. We found that expression of YAP decreased during differentiation of VSMC from CVPCs. Overexpression of YAP attenuated expression of VSMC contractile markers and impaired VSMC function. Knockdown of YAP increased expression of contractile proteins during CVPC-VSMCs differentiation. Importantly, expression of YAP decreased transcription of myocardin during this process. Overexpression of YAP in PAC1 SMC cell line inhibited luciferase activity of myocardin proximal promoter in a dose dependent and NKX2.5 dependent manners. YAP protein interacted with NKX2.5 protein and inhibited binding of NKX2.5 to the 5'-proximal promoter region of myocardin in CVPC-derived VSMCs. In conclusion, YAP negatively regulates differentiation of VSMCs from CVPCs by decreasing transcription of myocardin in a NKX2.5-dependent manner. Stem Cells 2017;35:351-361.
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Affiliation(s)
- Lunchang Wang
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA.,Department of Vascular Surgery, Xiangya School of medicine, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ping Qiu
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Jiao Jiao
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Hiroyuki Hirai
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Wei Xiong
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Jifeng Zhang
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Tianqing Zhu
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Peter X Ma
- Biologic and Materials Sciences, Biomedical Engineering, Macromolecular Science and Engineering, Materials Science and Engineering, University of Michigan, Ann arbor, Michigan, USA
| | - Y Eugene Chen
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
| | - Bo Yang
- Department of Cardiac Surgery, Frankel Cardiovascular Center, The University of Michigan, Ann Arbor, Michigan, USA
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60
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Abstract
TAZ, a transcriptional coactivator with PDZ-binding motif, is encoded by WWTR1 gene (WW domain containing transcription regulator 1). TAZ is tightly regulated in the hippo pathway-dependent and -independent manner in response to a wide range of extracellular and intrinsic signals, including cell density, cell polarity, F-actin related mechanical stress, ligands of G protein-coupled receptors (GPCRs), cellular energy status, hypoxia and osmotic stress. Besides its role in normal tissue development, TAZ plays critical roles in cell proliferation, differentiation, apoptosis, migration, invasion, epithelial-mesenchymal transition (EMT), and stemness in multiple human cancers. We discuss here the regulators and regulation of TAZ. We also highlight the tumorigenic roles of TAZ and its potential therapeutic impact in human cancers.
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Affiliation(s)
- Xin Zhou
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, and Department of Biochemistry and Molecular Biology and Institutes of Biomedical Sciences, Fudan University Shanghai Medical College, Shanghai, 200032, China.
- Department of Cancer Biology, University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.
| | - Qun-Ying Lei
- Key Laboratory of Metabolism and Molecular Medicine, Ministry of Education, and Department of Biochemistry and Molecular Biology and Institutes of Biomedical Sciences, Fudan University Shanghai Medical College, Shanghai, 200032, China.
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