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Xu Y, Liang C, Luo Y, Zhang T. MBNL1 regulates isoproterenol-induced myocardial remodelling in vitro and in vivo. J Cell Mol Med 2021; 25:1100-1115. [PMID: 33295096 PMCID: PMC7812249 DOI: 10.1111/jcmm.16177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/15/2020] [Accepted: 11/25/2020] [Indexed: 12/21/2022] Open
Abstract
Myocardial remodelling is a common phenomenon in cardiovascular diseases, which threaten human health and the quality of life. Due to the lack of effective early diagnosis and treatment methods, the molecular mechanism of myocardial remodelling should be explored in depth. In this study, we observed the high expression of MBNL1 in cardiac tissue and peripheral blood of an isoproterenol (ISO)-induced cardiac hypertrophy mouse model. MBNL1 promoted ISO-induced cardiac hypertrophy and fibrosis by stabilizing Myocardin mRNA in vivo and in vitro. Meanwhile, an increase in MBNL1 may induce the apoptosis of cardiomyocytes treated with ISO via TNF-α signalling. Interestingly, MBNL1 can be activated by p300 in cardiomyocytes treated with ISO. At last, Myocardin can reverse activate the expression of MBNL1. These results suggest that MBNL1 may be a potential target for the early diagnosis and clinical treatment of myocardial remodelling.
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Affiliation(s)
- Yao Xu
- College of Life Sciences and HealthWuhan University of Science and TechnologyWuhanChina
| | - Chen Liang
- College of Life Sciences and HealthWuhan University of Science and TechnologyWuhanChina
| | - Ying Luo
- College of Biological Science and TechnologyHubei Minzu UniversityEnshiChina
- Hubei Provincial Key Laboratory of Occurrence and Intervention of Rheumatic diseasesHubei Minzu UniversityEnshiChina
| | - Tongcun Zhang
- College of Life Sciences and HealthWuhan University of Science and TechnologyWuhanChina
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2
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Ma Q, Zhang J, Zhang M, Lan H, Yang Q, Li C, Zeng L. MicroRNA-29b targeting of cell division cycle 7-related protein kinase (CDC7) regulated vascular smooth muscle cell (VSMC) proliferation and migration. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:1496. [PMID: 33313241 PMCID: PMC7729318 DOI: 10.21037/atm-20-6856] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Background Proliferation and migration of vascular smooth muscle cells (VSMCs) are vital processes in vascular remodeling and pathology. This study aimed to explore the expression of miR-29b and cell division cycle 7-related protein kinase (CDC7) in patients with cerebral aneurysm (CA) and their effects on the proliferation and mobility of human umbilical artery smooth muscle cells (HUASMCs). Methods RNA levels of miR-29b and CDC7 were evaluated in the CA tissues and adjacent normal cerebral arteries from 18 patients undergoing surgery for CA rupture. The targeting of CDC7 by miR-29b was verified with luciferase reporter assay. Both CDC7 and miR-29b overexpression and silencing vectors were introduced to validate their effects on the proliferation and mobility of HUASMCs. Results The mRNA level of miR-29b was down-regulated (P<0.05), while the mRNA level of CDC7 was markedly elevated in CA patients (P<0.05). A Luciferase reporter assay showed CDC7 is a target gene of miR-29b, and miR-29b mimic down-regulated the mRNA and protein levels of CDC7 (P<0.05). Furthermore, miR-29b mimic inhibited, while miR-29b inhibitor or CDC7 over-expression promoted the proliferation and mobility of HUASMCs (P<0.05). Conclusions miR-29-3p inhibits cell proliferation and mobility via directly targeting CDC7, which could be a potential therapeutic target for vascular dysfunction related diseases, including atherosclerosis and CA.
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Affiliation(s)
- Qunhua Ma
- RICU&MICU, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Jing Zhang
- Emergency Observation Ward, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Ming Zhang
- Cancer Center, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Huan Lan
- Department of Cardiovascular Medicine, Southwest Medical University, Luzhou, China
| | - Qian Yang
- School of Nursing, Chengdu Medical College, Chengdu, China
| | - Chengping Li
- Emergency Observation Ward, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
| | - Li Zeng
- Department of Nursing, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, China
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3
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Podolsky MJ, Gupta D, Ha A, Ta R, Khalifeh-Soltani A, McKleroy W, Datta R, Sheppard D, Atabai K. Cell division cycle 7 kinase is a negative regulator of cell-mediated collagen degradation. Am J Physiol Lung Cell Mol Physiol 2018; 315:L360-L370. [PMID: 29792348 DOI: 10.1152/ajplung.00144.2018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Although extensive work has delineated many of the mechanisms of extracellular matrix (ECM) production, far less is known about pathways that regulate ECM degradation. This is particularly true of cellular internalization and degradation of matrix, which play an underappreciated role in ECM metabolism and lung fibrosis. For example, genetic perturbation of this pathway leads to exacerbated fibrosis in experimental animal models. In this work, we present the results of an unbiased screen of Drosophila phagocytes that yielded multiple genes that, when silenced, led to increased collagen uptake. We further describe the function of cell division cycle 7 kinase (CDC7) as a specific suppressor of collagen uptake. We show that the genetic or pharmacological inhibition of CDC7 results in increased expression of the collagen endocytic receptor Endo180. Chromobox 5 (CBX5) is a putative target of CDC7, and genetic silencing of CBX5 also results in increased Endo180 and collagen uptake. Finally, CRISPR-mediated activation of Endo180 expression results in increased collagen uptake, suggesting that CDC7 regulates collagen internalization through increased Endo180 expression. Targeting the regulatory elements of the collagen degradative machinery may be a useful therapeutic approach in diseases of fibrosis or malignancy.
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Affiliation(s)
- Michael J Podolsky
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Deepti Gupta
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Arnold Ha
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Ryan Ta
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Amin Khalifeh-Soltani
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - William McKleroy
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Ritwik Datta
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Dean Sheppard
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
| | - Kamran Atabai
- Department of Medicine, Lung Biology Center, Cardiovascular Research Institute, University of California, San Francisco, California
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4
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Dong K, Guo X, Chen W, Hsu AC, Shao Q, Chen JF, Chen SY. Mesenchyme homeobox 1 mediates transforming growth factor-β (TGF-β)-induced smooth muscle cell differentiation from mouse mesenchymal progenitors. J Biol Chem 2018; 293:8712-8719. [PMID: 29678882 DOI: 10.1074/jbc.ra118.002350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 04/12/2018] [Indexed: 11/06/2022] Open
Abstract
Differentiation of smooth muscle cells (SMCs) is critical for proper vasculogenesis and angiogenesis. However, the molecular mechanisms controlling SMC differentiation are not completely understood. During embryogenesis, the transcription factor mesenchyme homeobox 1 (Meox1) is expressed in the early developing somite, which is one of the origins of SMCs. In the present study, we identified Meox1 as a positive regulator of SMC differentiation. We found that transforming growth factor-β (TGF-β) induces Meox1 expression in the initial phase of SMC differentiation of pluripotent murine C3H10T1/2 cells. shRNA-mediated Meox1 knockdown suppressed TGF-β-induced expression of SMC early markers, whereas Meox1 overexpression increased expression of these markers. Mechanistically, Meox1 promoted SMAD family member 3 (Smad3) nuclear retention during the early stage of TGF-β stimulation because Meox1 inhibited protein phosphatase Mg2+/Mn2+-dependent 1A (PPM1A) and thereby prevented PPM1A-mediated Smad3 dephosphorylation. Meox1 appears to promote PPM1A degradation, leading to sustained Smad3 phosphorylation, thus allowing Smad3 to stimulate SMC gene transcription. In vivo, Meox1 knockdown in mouse embryos impaired SMC marker expression in the descending aorta of neonatal mice, indicating that Meox1 is essential for SMC differentiation during embryonic development. In summary, the transcriptional regulator Meox1 controls TGF-β-induced SMC differentiation from mesenchymal progenitor cells by preventing PPM1A-mediated Smad3 dephosphorylation, thereby supporting SMC gene expression.
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Affiliation(s)
- Kun Dong
- From the Department of Physiology and Pharmacology, University of Georgia, Athens, Georgia 30602
| | - Xia Guo
- From the Department of Physiology and Pharmacology, University of Georgia, Athens, Georgia 30602
| | - Weiping Chen
- Genomic Core Laboratory, NIDDK, National Institutes of Health, Bethesda, Maryland 20892, and
| | - Amanda C Hsu
- From the Department of Physiology and Pharmacology, University of Georgia, Athens, Georgia 30602
| | - Qiang Shao
- Ostrow School of Dentistry of USC, University of Southern California, Los Angeles, California 90089
| | - Jian-Fu Chen
- Ostrow School of Dentistry of USC, University of Southern California, Los Angeles, California 90089
| | - Shi-You Chen
- From the Department of Physiology and Pharmacology, University of Georgia, Athens, Georgia 30602,
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5
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Roostalu U, Aldeiri B, Albertini A, Humphreys N, Simonsen-Jackson M, Wong JKF, Cossu G. Distinct Cellular Mechanisms Underlie Smooth Muscle Turnover in Vascular Development and Repair. Circ Res 2017; 122:267-281. [PMID: 29167274 PMCID: PMC5771686 DOI: 10.1161/circresaha.117.312111] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/20/2017] [Accepted: 11/21/2017] [Indexed: 12/25/2022]
Abstract
Supplemental Digital Content is available in the text. Rationale: Vascular smooth muscle turnover has important implications for blood vessel repair and for the development of cardiovascular diseases, yet lack of specific transgenic animal models has prevented it’s in vivo analysis. Objective: The objective of this study was to characterize the dynamics and mechanisms of vascular smooth muscle turnover from the earliest stages of embryonic development to arterial repair in the adult. Methods and Results: We show that CD146 is transiently expressed in vascular smooth muscle development. By using CRISPR-Cas9 genome editing and in vitro smooth muscle differentiation assay, we demonstrate that CD146 regulates the balance between proliferation and differentiation. We developed a triple-transgenic mouse model to map the fate of NG2+CD146+ immature smooth muscle cells. A series of pulse-chase experiments revealed that the origin of aortic vascular smooth muscle cells can be traced back to progenitor cells that reside in the wall of the dorsal aorta of the embryo at E10.5. A distinct population of CD146+ smooth muscle progenitor cells emerges during embryonic development and is maintained postnatally at arterial branch sites. To characterize the contribution of different cell types to arterial repair, we used 2 injury models. In limited wire-induced injury response, existing smooth muscle cells are the primary contributors to neointima formation. In contrast, microanastomosis leads to early smooth muscle death and subsequent colonization of the vascular wall by proliferative adventitial cells that contribute to the repair. Conclusions: Extensive proliferation of immature smooth muscle cells in the primitive embryonic dorsal aorta establishes the long-lived lineages of smooth muscle cells that make up the wall of the adult aorta. A discrete population of smooth muscle cells forms in the embryo and is postnatally sustained at arterial branch sites. In response to arterial injuries, existing smooth muscle cells give rise to neointima, but on extensive damage, they are replaced by adventitial cells.
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Affiliation(s)
- Urmas Roostalu
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.).
| | - Bashar Aldeiri
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
| | - Alessandra Albertini
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
| | - Neil Humphreys
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
| | - Maj Simonsen-Jackson
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
| | - Jason K F Wong
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
| | - Giulio Cossu
- From the Manchester Academic Health Science Centre, Division of Cell Matrix Biology and Regenerative Medicine, Faculty of Biology, Medicine and Health, (U.R., B.A., A.A., J.K.F.W., G.C.) and Transgenic Core Research Facility, Faculty of Biology, Medicine and Health (N.H., M.S.-J.), University of Manchester, United Kingdom; and Plastic Surgery Department, Wythenshawe Hospital, Manchester University NHS Foundation Trust, United Kingdom (J.K.F.W.)
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6
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Xia XD, Zhou Z, Yu XH, Zheng XL, Tang CK. Myocardin: A novel player in atherosclerosis. Atherosclerosis 2017; 257:266-278. [DOI: 10.1016/j.atherosclerosis.2016.12.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 11/29/2016] [Accepted: 12/01/2016] [Indexed: 12/21/2022]
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7
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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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8
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Shi N, Chen SY. Smooth Muscle Cell Differentiation: Model Systems, Regulatory Mechanisms, and Vascular Diseases. J Cell Physiol 2015; 231:777-87. [DOI: 10.1002/jcp.25208] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Accepted: 09/29/2015] [Indexed: 02/06/2023]
Affiliation(s)
- Ning Shi
- Department of Physiology and Pharmacology; University of Georgia; Athens Georgia
| | - Shi-You Chen
- Department of Physiology and Pharmacology; University of Georgia; Athens Georgia
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9
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Abstract
Myocardin (MYOCD) is a potent transcriptional coactivator that functions primarily in cardiac muscle and smooth muscle through direct contacts with serum response factor (SRF) over cis elements known as CArG boxes found near a number of genes encoding for contractile, ion channel, cytoskeletal, and calcium handling proteins. Since its discovery more than 10 years ago, new insights have been obtained regarding the diverse isoforms of MYOCD expressed in cells as well as the regulation of MYOCD expression and activity through transcriptional, post-transcriptional, and post-translational processes. Curiously, there are a number of functions associated with MYOCD that appear to be independent of contractile gene expression and the CArG-SRF nucleoprotein complex. Further, perturbations in MYOCD gene expression are associated with an increasing number of diseases including heart failure, cancer, acute vessel disease, and diabetes. This review summarizes the various biological and pathological processes associated with MYOCD and offers perspectives to several challenges and future directions for further study of this formidable transcriptional coactivator.
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Affiliation(s)
- Joseph M Miano
- Aab Cardiovascular Research Institute, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
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10
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Shi N, Guo X, Chen SY. Olfactomedin 2, a novel regulator for transforming growth factor-β-induced smooth muscle differentiation of human embryonic stem cell-derived mesenchymal cells. Mol Biol Cell 2014; 25:4106-14. [PMID: 25298399 PMCID: PMC4263453 DOI: 10.1091/mbc.e14-08-1255] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Smooth muscle plays important roles in vascular development. Study of smooth muscle differentiation of human embryonic stem cell–derived mesenchymal cells identifies olfactomedin 2 as a novel regulator. Olfactomedin 2 regulates smooth muscle gene transcription by empowering serum response factor binding to the CArG box in smooth muscle gene promoters. Transforming growth factor-β (TGF-β) plays an important role in smooth muscle (SM) differentiation, but the downstream target genes regulating the differentiation process remain largely unknown. In this study, we identified olfactomedin 2 (Olfm2) as a novel regulator mediating SM differentiation. Olfm2 was induced during TGF-β–induced SM differentiation of human embryonic stem cell–derived mesenchymal cells. Olfm2 knockdown suppressed TGF-β–induced expression of SM markers, including SM α-actin, SM22α, and SM myosin heavy chain, whereas Olfm2 overexpression promoted the SM marker expression. TGF-β induced Olfm2 nuclear accumulation, suggesting that Olfm2 may be involved in transcriptional activation of SM markers. Indeed, Olfm2 regulated SM marker expression and promoter activity in a serum response factor (SRF)/CArG box–dependent manner. Olfm2 physically interacted with SRF without affecting SRF-myocardin interaction. Olfm2-SRF interaction promoted the dissociation of SRF from HERP1, a transcriptional repressor. Olfm2 also inhibited HERP1 expression. Moreover, blockade of Olfm2 expression inhibited TGF-β–induced SRF binding to SM gene promoters in a chromatin setting, whereas overexpression of Olfm2 dose dependently enhanced SRF binding. These results demonstrate that Olfm2 mediates TGF-β–induced SM gene transcription by empowering SRF binding to CArG box in SM gene promoters.
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Affiliation(s)
- Ning Shi
- Department of Physiology and Pharmacology, University of Georgia, Athens, GA 30602
| | - Xia Guo
- Department of Physiology and Pharmacology, University of Georgia, Athens, GA 30602
| | - Shi-You Chen
- Department of Physiology and Pharmacology, University of Georgia, Athens, GA 30602
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11
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Zheng XL. Myocardin and smooth muscle differentiation. Arch Biochem Biophys 2014; 543:48-56. [DOI: 10.1016/j.abb.2013.12.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/15/2013] [Accepted: 12/18/2013] [Indexed: 01/08/2023]
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