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Bai X, Wang Y, Luo X, Bao X, Weng X, Chen Y, Zhang S, Lv Y, Dai X, Zeng M, Yang D, Hu S, Li J, Ji Y, Jia H, Yu B. Cigarette tar accelerates atherosclerosis progression via RIPK3-dependent necroptosis mediated by endoplasmic reticulum stress in vascular smooth muscle cells. Cell Commun Signal 2024; 22:41. [PMID: 38229167 PMCID: PMC10790416 DOI: 10.1186/s12964-024-01480-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 01/05/2024] [Indexed: 01/18/2024] Open
Abstract
BACKGROUND Tar is the main toxic of cigarettes, and its effect on atherosclerosis progression and the underlying mechanisms remain largely unknown. Vascular smooth muscle cells (VSMCs) play a key role in atherogenesis and plaque vulnerability. The present study sought to investigate the mechanism of atherosclerosis progression through tar-induced VSMC necroptosis, a recently described form of necrosis. METHODS The effect of tar on atherosclerosis progression and VSMC necroptosis was examined in ApoE-/- mice and cultured VSMCs. The role of necroptosis in tar-induced plaque development was evaluated in RIPK3-deletion mice (ApoE-/-RIPK3-/-). The key proteins of necroptosis in carotid plaques of smokers and non-smokers were also examined. Quantitative proteomics of mice aortas was conducted to further investigate the underlying mechanism. Pharmacological approaches were then applied to modulate the expression of targets to verify the regulatory process of tar-induced necroptosis. RESULTS Tar administration led to increased atherosclerotic plaque area and reduced collagen and VSMCs in ApoE-/- mice. The expression of RIPK1、RIPK3、and MLKL in VSMCs of plaques were all increased in tar-exposed mice and smokers. RIPK3 deletion protected against VSMC loss and plaque progression stimulated by tar. In mechanistic studies, quantitative proteomics analysis of ApoE-/- mice aortas suggested that tar triggered endoplasmic reticulum (ER) stress. PERK-eIF2α-CHOP axis was activated in tar-treated VSMCs and atherosclerotic plaque. Inhibition of ER stress using 4PBA significantly reduced plaque progression and VSMC necroptosis. Further study revealed that ER stress resulted in calcium (Ca2+) release into mitochondria and cytoplasm. Elevated Ca2+ levels lead to mitochondrial dysfunction and excessive reactive oxygen species (ROS) production, which consequently promote RIPK3-dependent necroptosis. In addition, Ca2+/calmodulin-dependent protein kinase II (CaMKII) activated by cytosolic Ca2+ overload binds to RIPK3, accounting for necroptosis. CONCLUSION The findings revealed that cigarette tar promoted atherosclerosis progression by inducing RIPK3-dependent VSMC necroptosis and identified novel avenues of ER stress and Ca2+ overload.
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Affiliation(s)
- Xiaoxuan Bai
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Ying Wang
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Xing Luo
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Xiaoyi Bao
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Xiuzhu Weng
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Yuwu Chen
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Shan Zhang
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Ying Lv
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Xinyu Dai
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Ming Zeng
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Dan Yang
- Department of Forensic Medicine, Harbin Medical University, Harbin, 150081, China
| | - Sining Hu
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Ji Li
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
| | - Yong Ji
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
- Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China), Key Laboratory of Cardiovascular Medicine Research and NHC Key Laboratory of Cell Transplantation, Harbin, 150001, China
| | - Haibo Jia
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China.
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China.
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China.
| | - Bo Yu
- Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
- National Key Laboratory of Frigid Zone Cardiovascular Diseases, Harbin Medical University, Harbin, 150001, China
- Key Laboratory of Myocardial Ischemia, Ministry of Education, Harbin Medical University, Harbin, 150001, China
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Chowdhury MAR, An J, Jeong S. The Pleiotropic Face of CREB Family Transcription Factors. Mol Cells 2023; 46:399-413. [PMID: 37013623 PMCID: PMC10336275 DOI: 10.14348/molcells.2023.2193] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/03/2023] [Accepted: 02/07/2023] [Indexed: 04/05/2023] Open
Abstract
cAMP responsive element-binding protein (CREB) is one of the most intensively studied phosphorylation-dependent transcription factors that provide evolutionarily conserved mechanisms of differential gene expression in vertebrates and invertebrates. Many cellular protein kinases that function downstream of distinct cell surface receptors are responsible for the activation of CREB. Upon functional dimerization of the activated CREB to cis-acting cAMP responsive elements within the promoters of target genes, it facilitates signal-dependent gene expression. From the discovery of CREB, which is ubiquitously expressed, it has been proven to be involved in a variety of cellular processes that include cell proliferation, adaptation, survival, differentiation, and physiology, through the control of target gene expression. In this review, we highlight the essential roles of CREB proteins in the nervous system, the immune system, cancer development, hepatic physiology, and cardiovascular function and further discuss a wide range of CREB-associated diseases and molecular mechanisms underlying the pathogenesis of these diseases.
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Affiliation(s)
- Md. Arifur Rahman Chowdhury
- Division of Life Sciences (Molecular Biology Major), Department of Bioactive Material Sciences, and Research Center of Bioactive Materials, Jeonbuk National University, Jeonju 54896, Korea
| | - Jungeun An
- Division of Life Sciences (Life Sciences Major), Jeonbuk National University, Jeonju 54896, Korea
| | - Sangyun Jeong
- Division of Life Sciences (Molecular Biology Major), Department of Bioactive Material Sciences, and Research Center of Bioactive Materials, Jeonbuk National University, Jeonju 54896, Korea
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Therapeutical interference with the epigenetic landscape of germ cell tumors: a comparative drug study and new mechanistical insights. Clin Epigenetics 2022; 14:5. [PMID: 34996497 PMCID: PMC8742467 DOI: 10.1186/s13148-021-01223-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 12/18/2021] [Indexed: 12/18/2022] Open
Abstract
Background Type II germ cell tumors (GCT) are the most common solid cancers in males of age 15 to 35 years. Treatment of these tumors includes cisplatin-based therapy achieving high cure rates, but also leading to late toxicities. As mainly young men are suffering from GCTs, late toxicities play a major role regarding life expectancy, and the development of therapy resistance emphasizes the need for alternative therapeutic options. GCTs are highly susceptible to interference with the epigenetic landscape; therefore, this study focuses on screening of drugs against epigenetic factors as a treatment option for GCTs.
Results We present seven different epigenetic inhibitors efficiently decreasing cell viability in GCT cell lines including cisplatin-resistant subclones at low concentrations by targeting epigenetic modifiers and interactors, like histone deacetylases (Quisinostat), histone demethylases (JIB-04), histone methyltransferases (Chaetocin), epigenetic readers (MZ-1, LP99) and polycomb-repressive complexes (PRT4165, GSK343). Mass spectrometry-based analyses of the histone modification landscape revealed effects beyond the expected mode-of-action of each drug, suggesting a wider spectrum of activity than initially assumed. Moreover, we characterized the effects of each drug on the transcriptome of GCT cells by RNA sequencing and found common deregulations in gene expression of ion transporters and DNA-binding factors. A kinase array revealed deregulations of signaling pathways, like cAMP, JAK-STAT and WNT. Conclusion Our study identified seven drugs against epigenetic modifiers to treat cisplatin-resistant GCTs. Further, we extensively analyzed off-target effects and modes-of-action, which are important for risk assessment of the individual drugs. Supplementary Information The online version contains supplementary material available at 10.1186/s13148-021-01223-1.
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Zinc-mediated activation of CREB pathway in proliferation of pulmonary artery smooth muscle cells in pulmonary hypertension. Cell Commun Signal 2021; 19:103. [PMID: 34635097 PMCID: PMC8504081 DOI: 10.1186/s12964-021-00779-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 08/24/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Transcription factor CREB is involved in the development of pulmonary hypertension (PH). However, little is known about the role and regulatory signaling of CREB in PH. METHODS A series of techniques, including bioinformatics methods, western blot, cell proliferation and luciferase reporter assay were used to perform a comprehensive analysis of the role and regulation of CREB in proliferation of pulmonary artery smooth muscle cells (PASMCs) in PH. RESULTS Using bioinformatic analysis of the differentially expressed genes (DEGs) identified in the development of monocrotaline (MCT)- and hypoxia-induced PH, we found the overrepresentation of CRE-containing DEGs. Western blot analysis revealed a sustained increase in total- and phosphorylated-CREB in PASMCs isolated from rats treated with MCT. Similarly, an enhanced and prolonged serum-induced CREB phosphorylation was observed in hypoxia-pretreated PASMCs. The sustained CREB phosphorylation in PASMCs may be associated with multiple protein kinases phosphorylated CREB. Additionally, hierarchical clustering analysis showed reduced expression of the majority of CREB phosphatases in PH, including regulatory subunits of PP2A, Ppp2r2c and Ppp2r3a. Cell proliferation analysis showed increased PASMCs proliferation in MCT-induced PH, an effect relied on CREB-mediated transcriptional activity. Further analysis revealed the raised intracellular labile zinc possibly from ZIP12 was associated with reduced phosphatases, increased CREB-mediated transcriptional activity and PASMCs proliferation. CONCLUSIONS CREB pathway was overactivated in the development of PH and contributed to PASMCs proliferation, which was associated with multiple protein kinases and/or reduced CREB phosphatases and raised intracellular zinc. Thus, this study may provide a novel insight into the CREB pathway in the pathogenesis of PH. Video abstract.
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Perrault R, Molnar P, Poole J, Zahradka P. PDGF-BB-mediated activation of CREB in vascular smooth muscle cells alters cell cycling via Rb, FoxO1 and p27 kip1. Exp Cell Res 2021; 404:112612. [PMID: 33895117 DOI: 10.1016/j.yexcr.2021.112612] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION & AIM The vascular response to injury leads to the secretion of several factors, including platelet-derived growth factor (PDGF-BB). PDGF-BB stimulates smooth muscle cell (SMC) conversion to the synthetic phenotype, thereby enhancing proliferation and migration, and contributing to neointimal hyperplasia. Likewise, the cAMP response element binding protein (CREB) transcription factor has been shown to mediate SMC proliferation in response to various mitogens. We therefore investigated the contribution of CREB to PDGF-BB-dependent proliferation of SMCs with the intention of identifying signaling pathways involved both up and downstream of CREB activation. METHODS & RESULTS Treatments were performed on vascular SMCs from a porcine coronary artery explant model. The role of CREB was examined via adenoviral expression of a dominant-negative CREB mutant (kCREB) as well as inhibition of CREB binding protein (CBP). Involvement of the p27kip1 pathway was determined using a constitutively expressing p27kip1 adenoviral vector. PDGF-BB stimulated transient CREB phosphorylation on Ser-133 via ERK1/2-, PI3-kinase- and Src-dependent pathways. Expression of kCREB decreased PDGF-BB-dependent cell proliferation. PCNA expression and Rb phosphorylation were also inhibited by kCREB. These cell cycle proteins are controlled via p27kip1 expression in response to CREB-dependent post-translational modification of FoxO1. kCREB had no effect on Cyclin D1 expression, but did prevent PDGF-BB-induced Cyclin D1 nuclear translocation. An interaction inhibitor of CBP confirmed that Cyclin D1 is downstream of PDGF-BB and CREB. CONCLUSION CREB phosphorylation is required for SMC proliferation in response to PDGF-BB. This phenotypic change requires CBP and is mediated by Cyclin D1 and p27kip as a result of changes in FoxO1 activity.
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Affiliation(s)
- Raissa Perrault
- Department of Physiology and Pathophysiology, University of Manitoba, Canada; Molecular Physiology Laboratory, St. Boniface Albrechtsen Research Centre, Canada; Department of Experimental Sciences, Université de Saint Boniface, Winnipeg, Manitoba, Canada
| | - Peter Molnar
- Department of Physiology and Pathophysiology, University of Manitoba, Canada; Molecular Physiology Laboratory, St. Boniface Albrechtsen Research Centre, Canada
| | - Jenna Poole
- Molecular Physiology Laboratory, St. Boniface Albrechtsen Research Centre, Canada
| | - Peter Zahradka
- Department of Physiology and Pathophysiology, University of Manitoba, Canada; Molecular Physiology Laboratory, St. Boniface Albrechtsen Research Centre, Canada.
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Xue M, Li D, Wang Z, Mi L, Cao S, Zhang L, Kong X. IFI16 contributes to the pathogenesis of abdominal aortic aneurysm by regulating the caspase-1/IL-1β/MCPIP1 pathway. Life Sci 2020; 265:118752. [PMID: 33188834 DOI: 10.1016/j.lfs.2020.118752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 11/08/2020] [Accepted: 11/10/2020] [Indexed: 02/07/2023]
Abstract
AIMS Abdominal aortic aneurysm (AAA) is a multi-factorial progressive vascular disease characterized by chronic inflammatory cell infiltration. We investigated the roles played by IFI16 and ASC inflammasomes in AAA development and progression. MATERIALS AND METHODS Western blot and qRT-PCR studies were performed to analyze the expression of relative genes in AAA specimens and mouse vascular smooth muscle cells (VSMCs). The apoptosis rates and ROS levels of VSMCs were assessed by flow cytometry. Transwell assays were performed to analyze the migration ability of VSMCs. The levels of MCP-1, IL-1β, and IL-6 in the supernatants of cultured VSMCs were analyzed by ELISA. KEY FINDINGS Increased levels of IFI16 expression were found in AAA specimens and Ang-II-treated VSMCs. IFI16 and ASC silencing suppressed the apoptosis and migration ability of VSMCs undergoing Ang-II treatment, reduced elasticity damage to the aortic wall, and decreased the levels of MMP expression. The effect of IFI16 knockdown in Ang-II-induced VSMCs was reversed by MCPIP1 overexpression. SIGNIFICANCE Our data suggest that an up-regulation of IFI16 and ASC expression might promote the apoptosis of VSMCs, enhance the inflammatory response, and impairs vascular wall elasticity via a MCPIP1-related mechanism. The inflammasome components IFI16 and ASC might be involved in AAA progression and serve as target molecules for diagnosing and treating AAA.
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Affiliation(s)
- Ming Xue
- Department of Interventional Radiology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, China
| | - Dan Li
- Department of Central Laboratory, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, China
| | - Zhu Wang
- Department of Interventional Medicine and Vascular Surgery, the Affiliated Hospital of Binzhou Medical University, Binzhou 256603, Shandong, China
| | - Lei Mi
- Department of General Surgery, Taian City Central Hospital, Taian 271000, Shandong, China
| | - Shuwei Cao
- Department of Interventional Radiology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, China
| | - Lijun Zhang
- Department of Interventional Radiology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, China
| | - Xiangqian Kong
- Department of Vascular Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan 250021, Shandong, China; Department of Vascular Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250021, Shandong, China.
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Up-regulated MCPIP1 in abdominal aortic aneurysm is associated with vascular smooth muscle cell apoptosis and MMPs production. Biosci Rep 2020; 39:220754. [PMID: 31651935 PMCID: PMC6851509 DOI: 10.1042/bsr20191252] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 09/24/2019] [Accepted: 10/08/2019] [Indexed: 12/27/2022] Open
Abstract
Abdominal aortic aneurysm (AAA) is often clinically silent before rupture characterized by extensive vascular inflammation and degenerative elasticity of aortic wall. Monocyte chemotactic protein-induced protein-1 (MCPIP1) exhibits anti-infllammatory and pro-apoptotic effects involved in atherogenesis. However, little is known about the expression and the contribution of MCPIP1 in AAA. In the present study, we collected clinical AAA specimens and constructed AAA mice model through Ang-II infusion, and found apparently increased MCPIP1 expression and severe inflammatory infiltration in AAA aortic membrane as evidenced by elevated levels of monocyte chemotactic protein 1 (MCP-1), interleukin 1 β (IL-1β) and NF-κB, as well as HE staining. The elasticity of aortic tunica media was impaired along with multiple apoptosis of vascular smooth muscle cells (VSMCs) in Ang-II-induced aneurysmal mouse. In vitro Ang-II administration of VSMCs induced MCPIP1 expression, accompanied by up-regulation of matrix metalloproteinase (MMP) 2 (MMP-2) and MMP-9, as well as enhancement of VSMCs proliferation and apoptosis, which may cause damage of intima–media elasticity. Silencing MCPIP1 reversed above effects to further restore the balance of proliferation and apoptosis in VSMCs. Overall, our data indicated that up-regulation of MCPIP1 may become a promising candidate for the diagnosis of AAA, and specific knockdown of MCPIP1 in VSMCs could inhibit VSMCs apoptosis and down-regulate MMPs to maintain vascular wall elasticity. Therefore, knockdown of MCPIP1 may serve as a potential target for gene therapy of AAA.
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Garat CV, Majka SM, Sullivan TM, Crossno JT, Reusch JE, Klemm DJ. CREB depletion in smooth muscle cells promotes medial thickening, adventitial fibrosis and elicits pulmonary hypertension. Pulm Circ 2020; 10:2045894019898374. [PMID: 32313640 PMCID: PMC7158261 DOI: 10.1177/2045894019898374] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 12/11/2019] [Indexed: 01/10/2023] Open
Abstract
Levels of the cAMP-responsive transcription factor, CREB, are reduced in medial smooth muscle cells in remodeled pulmonary arteries from hypertensive calves and rats with chronic hypoxia-induced pulmonary hypertension. Here, we show that chronic hypoxia fails to promote CREB depletion in pulmonary artery smooth muscle cells or elicit significant remodeling of the pulmonary arteries in mice, suggesting that sustained CREB expression prevents hypoxia-induced pulmonary artery remodeling. This hypothesis was tested by generating mice, in which CREB was ablated in smooth muscle cells. Loss of CREB in smooth muscle cells stimulated pulmonary artery thickening, right ventricular hypertrophy, profound adventitial collagen deposition, recruitment of myeloid cells to the adventitia, and elevated right ventricular systolic pressure without exposure to chronic hypoxia. Isolated murine CREB-null smooth muscle cells exhibited serum-independent proliferation and hypertrophy in vitro and medium conditioned by CREB-null smooth muscle cells stimulated proliferation and expression of extracellular matrix proteins by adventitial fibroblasts. We conclude that CREB governs the pathologic switch from homeostatic, quiescent smooth muscle cells to proliferative, synthetic cells that drive arterial remodeling contributing to the development or pulmonary hypertension.
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Affiliation(s)
- Chrystelle V. Garat
- Cardiovascular Pulmonary Research Laboratory, Department of Medicine, University of Colorado, Aurora, CO, USA
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Susan M. Majka
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, National Jewish Health, Denver, Denver, CO, USA
| | - Timothy M. Sullivan
- Cardiovascular Pulmonary Research Laboratory, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Joseph T. Crossno
- Cardiovascular Pulmonary Research Laboratory, Department of Medicine, University of Colorado, Aurora, CO, USA
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Jane E.B. Reusch
- Cardiovascular Pulmonary Research Laboratory, Department of Medicine, University of Colorado, Aurora, CO, USA
- Division of Endocrinology, Department of Medicine, University of Colorado, Aurora, CO, USA
| | - Dwight J. Klemm
- Cardiovascular Pulmonary Research Laboratory, Department of Medicine, University of Colorado, Aurora, CO, USA
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado, Aurora, CO, USA
- Geriatric Research, Education and Clinical Center, Veterans Administration, Eastern Colorado Health Care System, Aurora, CO, USA
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Yu Q, Li W, Jin R, Yu S, Xie D, Zheng X, Zhong W, Cheng X, Hu S, Li M, Zheng Q, Li G, Song Z. PI3Kγ (Phosphoinositide 3-Kinase γ) Regulates Vascular Smooth Muscle Cell Phenotypic Modulation and Neointimal Formation Through CREB (Cyclic AMP-Response Element Binding Protein)/YAP (Yes-Associated Protein) Signaling. Arterioscler Thromb Vasc Biol 2020; 39:e91-e105. [PMID: 30651001 DOI: 10.1161/atvbaha.118.312212] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Objective- Vascular smooth muscle cells (VSMCs) phenotype modulation is critical for the resolution of vascular injury. Genetic and pharmacological inhibition of PI3Kγ (phosphoinositide 3-kinase γ) exerts anti-inflammatory and protective effects in multiple cardiovascular diseases. This study investigated the role of PI3Kγ and its downstream effector molecules in the regulation of VSMC phenotypic modulation and neointimal formation in response to vascular injury. Approach and Results- Increased expression of PI3Kγ was found in injured vessel wall as well in cultured, serum-activated wild-type VSMCs, accompanied by a reduction in the expression of calponin and SM22α, 2 differentiation markers of VSMCs. However, the injury-induced downregulation of calponin and SM22α was profoundly attenuated in PI3Kγ-/- mice. Pharmacological inhibition and short hairpin RNA knockdown of PI3Kγ (PI3Kγ-KD) markedly attenuated YAP (Yes-associated protein) expression and CREB (cyclic AMP-response element binding protein) activation but improved the downregulation of differentiation genes in cultured VSMCs accompanied by reduced cell proliferation and migration. Mechanistically, activated CREB upregulated YAP transcriptional expression through binding to its promoter. Ectopic expression of YAP strikingly repressed the expression of differentiation genes even in PI3Kγ-KD VSMCs. Moreover, established carotid artery ligation and chimeric mice models demonstrate that deletion of PI3Kγ in naïve PI3Kγ-/- mice as well as in chimeric mice lacking PI3Kγ either in bone marrow or vascular wall significantly reduced neointimal formation after injury. Conclusions- PI3Kγ controls phenotypic modulation of VSMCs by regulating transcription factor CREB activation and YAP expression. Modulating PI3Kγ signaling on local vascular wall may represent a new therapeutic approach to treat proliferative vascular disease.
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Affiliation(s)
- Qihong Yu
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Li
- Departments of Gerontology (W.L.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Rong Jin
- Department of Neurosurgery, Louisiana State University Health Sciences Center, Shreveport (R.J., S.Y., G.L.).,and Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, PA (R.J., W.Z., G.L.)
| | - Shiyong Yu
- Department of Neurosurgery, Louisiana State University Health Sciences Center, Shreveport (R.J., S.Y., G.L.).,Department of Cardiology, Xinqiao Hospital, Third Military Medical University, Chongqing, China (S.Y.)
| | - Dawei Xie
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xichuan Zheng
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Zhong
- and Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, PA (R.J., W.Z., G.L.)
| | - Xiang Cheng
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shaobo Hu
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Min Li
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qichang Zheng
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Guohong Li
- Department of Neurosurgery, Louisiana State University Health Sciences Center, Shreveport (R.J., S.Y., G.L.).,and Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, PA (R.J., W.Z., G.L.)
| | - Zifang Song
- From the Department of Hepatobiliary Surgery (Q.Y., D.X., X.Z., X.C., S.H., M.L., Q.Z., Z.S.), Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Uchida D, Saito Y, Kikuchi S, Yoshida Y, Hirata S, Sasajima T, Azuma N. Development of gene therapy with a cyclic adenosine monophosphate response element decoy oligodeoxynucleotide to prevent vascular intimal hyperplasia. J Vasc Surg 2019; 71:229-241. [PMID: 31204215 DOI: 10.1016/j.jvs.2019.02.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 02/17/2019] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Intimal hyperplasia (IH) is the main cause of therapeutic failure after vascular and endovascular surgery. However, there is currently no targeted therapy for the treatment of IH. We recently reported that the inhibition of cyclic adenosine monophosphate response element (CRE) binding protein (CREB) activation is important in vein graft IH. We focused on a decoy oligodeoxynucleotide (ODN) therapeutic strategy for suppressing IH as a clinical application. The objective of this study was to confirm the therapeutic effect of a CRE decoy ODN in an animal model as a novel therapy for preventing intimal hyperplasia as the first step of the preclinical study of our strategy. METHODS We designed two phosphorothioate CREs and two scramble decoy ODNs and screened them using a CREB transcription assay to check their ability to bind to a CRE sequence. We chose a CRE decoy ODN with high first-binding ability and transfected it into vascular smooth muscle cells (VSMCs) in vitro. Proliferation and migration were assessed using MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium) assays and modified Boyden chamber assays. We examined CRE activity using a luciferase reporter gene assay. We assessed the expression of messenger RNAs by quantitative real-time polymerase chain reaction. In a wire-injury mouse model (C57BL6, n = 6), CRE decoy ODN was transfected into the injured vessel wall using an ultrasound-sonoporation method in vivo. Mitogen-activated protein kinase-activated protein kinase 3 (MAPKAPK3) and four and a half LIM domains 5 (FHL5) expression of pregrafting vein remnants were assessed by immunohistologic analyses. RESULTS Compared with scramble decoy ODN, the selected CRE decoy ODN could significantly decrease CRE activity (mean ± standard error of the mean: 0.20 ± 0.03 vs 1.00 ± 0.16, n = 6; P < .05) as shown by a luciferase reporter gene assay, VSMC proliferation (0.73 ± 0.04 vs 0.89 ± 0.02, n = 6; P < .05) and migration (96.4 ± 6.1 vs 311.4 ± 19.1 migrated VSMCs/well, n = 6; P < .05) after 24-hour transfection. The CRE decoy ODN significantly suppressed the formation of IH at injured vessel walls in an animal model, as analyzed by pathologic staining (0.20 ± 0.02 vs 0.56 ± 0.08, area of the intima/area of the artery vs the control after 21 days' transfection, n = 6; P < .05). Furthermore, MAPKAPK3 and FHL5, which are CREB activators, were significantly expressed in pregrafting vein remnants in diabetes mellitus patients. CONCLUSIONS CREB-CRE signaling is an important mechanism of IH formation, and CRE decoy therapy can help preventing IH. This study is the first part of the preclinical study of our strategy.
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MESH Headings
- Animals
- CREB-Binding Protein/genetics
- CREB-Binding Protein/metabolism
- Cell Movement
- Cell Proliferation
- Cells, Cultured
- Cyclic AMP/metabolism
- Disease Models, Animal
- Humans
- Intracellular Signaling Peptides and Proteins/genetics
- Intracellular Signaling Peptides and Proteins/metabolism
- LIM Domain Proteins/genetics
- LIM Domain Proteins/metabolism
- Male
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/injuries
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Neointima
- Oligodeoxyribonucleotides/genetics
- Oligodeoxyribonucleotides/metabolism
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- Response Elements/genetics
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Vascular System Injuries/genetics
- Vascular System Injuries/metabolism
- Vascular System Injuries/pathology
- Vascular System Injuries/prevention & control
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Affiliation(s)
- Daiki Uchida
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Yukihiro Saito
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan.
| | - Shinsuke Kikuchi
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Yuri Yoshida
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Satoshi Hirata
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Tadahiro Sasajima
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Nobuyoshi Azuma
- Division of Vascular Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
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11
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Cai W, Zhang J, Yang J, Fan Z, Liu X, Gao W, Zeng P, Xiong M, Ma C, Yang J. MicroRNA-24 attenuates vascular remodeling in diabetic rats through PI3K/Akt signaling pathway. Nutr Metab Cardiovasc Dis 2019; 29:621-632. [PMID: 31005375 DOI: 10.1016/j.numecd.2019.03.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 03/02/2019] [Accepted: 03/04/2019] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND AIMS The vascular remodeling plays a crucial role in pathogenesis of diabetic cardiovascular complications. In this study, we intended to explore the effects and potential mechanisms of microRNA-24 (miR-24) on vascular remodeling under diabetic conditions. METHODS AND RESULTS MiR-24 recombinant adenovirus (Ad-miR-24-GFP) was used to induce miR-24 overexpression either in carotid arteries or high glucose (HG)-induced vascular smooth muscle cells (VSMCs). Cell proliferation was analyzed using CCK-8 method. Cell migration was examined using wound-healing and transwell assay. mRNA and protein expressions of critical factors were, respectively, measured by real-time PCR and western blot as follows: qRT-PCR for the levels of miR-24, PIK3R1; western blot for the protein levels of PI3K (p85α), Akt, p-Akt, mTOR, p-mTOR, 4E-BP1, p-4E-BP1, p70s6k, p-p70s6k, MMP 2, MMP 9, collagen Ⅰ, as well as collagen Ⅲ. Carotid arteries in diabetic rats suffered balloon injury were harvested and examined by HE, immunohistochemical and Masson trichrome staining. The expression of miR-24 was decreased in HG-stimulated VSMCs and balloon-injured carotid arteries of diabetic rats, accompanied by increased mRNA expression of PIK3R1. The up-regulation of miR-24 suppressed VSMCs proliferation, migration, collagen deposition not only induced by HG in vitro, but also in balloon-injured diabetic rats, which were related to inactivation of PI3K/Akt signaling pathway. CONCLUSION The up-regulation of miR-24 significantly attenuated vascular remodeling both in balloon-injured diabetic rats and HG-stimulated VSMCs via suppression of proliferation, migration and collagen deposition by acting on PIK3R1 gene that modulated the PI3K/Akt/mTOR axes.
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MESH Headings
- Animals
- Carotid Arteries/enzymology
- Carotid Arteries/pathology
- Carotid Artery Injuries/enzymology
- Carotid Artery Injuries/genetics
- Carotid Artery Injuries/pathology
- Cell Movement
- Cell Proliferation
- Cells, Cultured
- Diabetes Mellitus, Experimental/enzymology
- Diabetes Mellitus, Experimental/genetics
- Diabetes Mellitus, Experimental/pathology
- Fibrillar Collagens/metabolism
- Male
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/enzymology
- Myocytes, Smooth Muscle/pathology
- Neointima
- Phosphatidylinositol 3-Kinase/metabolism
- Proto-Oncogene Proteins c-akt/metabolism
- Rats, Sprague-Dawley
- Signal Transduction
- TOR Serine-Threonine Kinases/metabolism
- Vascular Remodeling
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Affiliation(s)
- W Cai
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Yichang Key Laboratory of Ischemic Cardiovascular and Cerebrovascular Disease Translational Medicine, China
| | - J Zhang
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - J Yang
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - Z Fan
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - X Liu
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - W Gao
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - P Zeng
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - M Xiong
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - C Ma
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China
| | - J Yang
- Department of Cardiology, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China; Department of Central Experimental Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang 443003, China.
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12
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Parker T, Wang KW, Manning D, Dart C. Soluble adenylyl cyclase links Ca 2+ entry to Ca 2+/cAMP-response element binding protein (CREB) activation in vascular smooth muscle. Sci Rep 2019; 9:7317. [PMID: 31086231 PMCID: PMC6514005 DOI: 10.1038/s41598-019-43821-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 04/30/2019] [Indexed: 12/21/2022] Open
Abstract
Ca2+-transcription coupling controls gene expression patterns that define vascular smooth muscle cell (VSMC) phenotype. Although not well understood this allows normally contractile VSMCs to become proliferative following vessel injury, a process essential for repair but which also contributes to vascular remodelling, atherogenesis and restenosis. Here we show that the Ca2+/HCO3--sensitive enzyme, soluble adenylyl cyclase (sAC), links Ca2+ influx in human coronary artery smooth muscle cells (hCASMCs) to 3',5'-cyclic adenosine monophosphate (cAMP) generation and phosphorylation of the transcription factor Ca2+/cAMP response element binding protein (CREB). Store-operated Ca2+ entry (SOCE) into hCASMCs expressing the FRET-based cAMP biosensor H187 induced a rise in cAMP that mirrored cytosolic [Ca2+]. SOCE also activated the cAMP effector, protein kinase A (PKA), as determined by the PKA reporter, AKAR4-NES, and induced phosphorylation of vasodilator-stimulated phosphoprotein (VASP) and CREB. Transmembrane adenylyl cyclase inhibition had no effect on the SOCE-induced rise in cAMP, while sAC inhibition abolished SOCE-generated cAMP and significantly reduced SOCE-induced VASP and CREB phosphorylation. This suggests that SOCE in hCASMCs activates sAC which in turn activates the cAMP/PKA/CREB axis. sAC, which is insensitive to G-protein modulation but responsive to Ca2+, pH and ATP, may therefore act as an overlooked regulatory node in vascular Ca2+-transcription coupling.
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Affiliation(s)
- Tony Parker
- Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, United Kingdom
| | - Kai-Wen Wang
- Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, United Kingdom
| | - Declan Manning
- Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, United Kingdom
| | - Caroline Dart
- Institute of Integrative Biology, University of Liverpool, Liverpool, L69 7ZB, United Kingdom.
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13
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Peng L, Huang X, Jin X, Jing Z, Yang L, Zhou Y, Ren J, Zhao Y. Wedelolactone, a plant coumarin, prevents vascular smooth muscle cell proliferation and injury-induced neointimal hyperplasia through Akt and AMPK signaling. Exp Gerontol 2017. [PMID: 28634089 DOI: 10.1016/j.exger.2017.06.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Wedelolactone (WDL) is a natural compound derived from Chinese herbal medicine Eclipta prostrate L, and has been reported to exhibit various effects potentially beneficial for human health. However, the possible preventive effects of WDL toward vascular remodeling and mechanisms involved have not been investigated to date. In this study, we investigated the effects of WDL on proliferation induced by platelet-derived growth factor (PDGF) in primary rat aortic smooth muscle cells (VSMCs) and on neointimal hyperplasia resulted from balloon injury in rats. WDL exhibited strong inhibitory effects against PDGF-induced VSMC proliferation. Cell cycle analysis revealed that WDL induced G0/G1 arrest and prevented cell cycle from entering S phase. Immunoblot analysis suggested that the cell cycle arrest induced by WDL was through Akt suppression and adenosine 5'-monophosphate-activated protein kinase (AMPK) activation, with a subsequent cyclin-dependent kinase inhibitor p21 induction and cyclin D1 inhibition. We also observed that WDL notably reduced neointima-to-media area ratio of balloon-injured rat common carotid arteries (CCAs) in comparison with those untreated balloon-injured CCAs. The regulation of WDL on protein expressions of Akt, AMPK and cyclin D1 in vivo were also consistent with that in vitro. Taken together, our results suggest WDL exhibits potential preventive effects toward vascular remodeling and neointimal hyperplasia through the reduction of VSMC proliferation via inhibition of Akt and activation of AMPK.
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Affiliation(s)
- Lu Peng
- Medical College, Xiamen University, Xiamen 361000, China
| | - Xuefeng Huang
- Zhongshan Hospital, Xiamen University, Xiamen 361000, China
| | - Xin Jin
- Medical College, Xiamen University, Xiamen 361000, China
| | - Zuo Jing
- Medical College, Xiamen University, Xiamen 361000, China
| | - Lichao Yang
- Medical College, Xiamen University, Xiamen 361000, China
| | - Yu Zhou
- Medical College, Xiamen University, Xiamen 361000, China
| | - Jie Ren
- Medical College, Xiamen University, Xiamen 361000, China
| | - Yun Zhao
- Medical College, Xiamen University, Xiamen 361000, China; Fujian Provincial Key Laboratory of Regenerative Medicine, Xiamen 361000, China.
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14
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Thrombopoietin Signaling Pathway Regulates Hepatocyte Activation in Rat Liver Regeneration. Biochem Genet 2015; 53:244-59. [DOI: 10.1007/s10528-015-9685-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 06/18/2015] [Indexed: 01/23/2023]
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15
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Yuan K, Liang W, Zhang J. A comprehensive analysis of differentially expressed genes and pathways in abdominal aortic aneurysm. Mol Med Rep 2015; 12:2707-14. [PMID: 25936411 DOI: 10.3892/mmr.2015.3709] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 03/03/2015] [Indexed: 11/05/2022] Open
Abstract
The current study aimed to investigate the molecular mechanism underlying abdominal aortic aneurysm (AAA) via various bioinformatics techniques. Gene expression profiling analysis of differentially expressed genes (DEGs) between AAA samples and normal controls was conducted. The Database for Annotation, Visualization and Integrated Discovery tool was utilized to perform Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes analyses for DEGs and clusters from the protein-protein interaction (PPI) network, which was constructed using the Search Tool for the Retrieval of Interacting Genes. In addition, important transcription factors (TFs) that regulated DEGs were investigated. A total of 346 DEGs were identified between AAA samples and healthy controls. Additionally, four clusters were identified from the PPI network. Cluster 1 was associated with sensory perception of smell and the olfactory transduction subpathway. The most significant GO function terms for cluster 2 and 3 were response to virus and defense response, respectively. Cluster 4 was associated with mitochondria-associated functions and the oxidative phosphorylation subpathway. Early growth response-1 (EGR-1), Myc, activating transcription factor 5 (ATF5) and specificity protein (SP) 1:SP3 were identified to be critical TFs in this disease. The present study suggested that the olfactory transduction subpathway, mitochondria and oxidative phosphorylation pathways were involved in AAA, and TFs, such as EGR-1, Myc, ATF5 and SP1:SP3, may be potential candidate molecular targets for this disease.
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Affiliation(s)
- Kai Yuan
- Department of Vascular Surgery, Renji Hospital of Shanghai Jiao Tong University School of Medicine, Shanghai 200127, P.R. China
| | - Wei Liang
- Department of Vascular Surgery, Renji Hospital of Shanghai Jiao Tong University School of Medicine, Shanghai 200127, P.R. China
| | - Jiwei Zhang
- Department of Vascular Surgery, Renji Hospital of Shanghai Jiao Tong University School of Medicine, Shanghai 200127, P.R. China
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16
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Balogh A, Németh M, Koloszár I, Markó L, Przybyl L, Jinno K, Szigeti C, Heffer M, Gebhardt M, Szeberényi J, Müller DN, Sétáló G, Pap M. Overexpression of CREB protein protects from tunicamycin-induced apoptosis in various rat cell types. Apoptosis 2015; 19:1080-98. [PMID: 24722832 DOI: 10.1007/s10495-014-0986-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Endoplasmic reticulum (ER) stress plays an essential role in unfolded protein response induced apoptosis contributing to several pathological conditions. Glycogen synthase kinase-3β (GSK-3β) plays a central role in several apoptotic signaling, including ER stress, as the active form of GSK-3β induces apoptosis. The phosphorylation of cAMP responsive element (CRE) binding protein (CREB) Ser-133 (S133) residue is the end-point of various signaling pathways, like growth factor signaling, while the Ser-129 (S129) residue is phosphorylated by GSK-3β. The significance of the ubiquitously expressed transcription factor CREB is demonstrated in prolonged, tunicamycin (TM)-induced ER stress in this study. In the experiments wild-type (wt) CREB, S129Ala, S133Ala or S129Ala-S133Ala mutant CREB expressing PC12 rat pheochromocytoma cell lines showed increased survival under TM-evoked prolonged ER stress compared to wtPC12 cells. After TM treatment ER stress was activated in all PC12 cell types. Lithium and SB-216763, the selective, well-known inhibitors of GSK-3β, decreased TM-induced apoptosis and promoted cell survival. The proapoptotic BH3-only Bcl-2 family member Bcl-2-interacting mediator of cell death (Bim) level was decreased in the different CREB overexpressing PC12 cells as a result of TM treatment. CREB overexpression also inhibited the sequestration of Bim protein from tubulin molecules, as it was demonstrated in wtPC12 cells. Transient expression of wtCREB diminished TM-induced apoptosis in wtPC12, Rat-1 and primary rat vascular smooth muscle cells. These findings demonstrate a novel role of CREB in different cell types as a potent protector against ER stress.
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Affiliation(s)
- András Balogh
- Department of Medical Biology, University of Pécs Medical School, Szigeti 12, Pecs, 7624, Hungary
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Guan S, Tang Q, Liu W, Zhu R, Li B. Nobiletin Inhibits PDGF-BB-induced vascular smooth muscle cell proliferation and migration and attenuates neointimal hyperplasia in a rat carotid artery injury model. Drug Dev Res 2014; 75:489-96. [PMID: 25452110 DOI: 10.1002/ddr.21230] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 09/05/2014] [Indexed: 01/21/2023]
Abstract
Preclinical Research The abnormal migration and proliferation of vascular smooth muscle cells (VSMCs) plays a pivotal role in the development of neointimal hyperplasia after vascular injury. Nobiletin, a citrus bioflavonoid, exhibits anti-inflammatory and anti-oxidative activities. The present study evalutaed whether nobiletin could inhibit platelet-derived growth factor (PDGF)-BB- stimulated VSMC proliferation and migration and decrease neointimal hyperplasia in a rat carotid artery injury model. Cultured VSMCs from rat thoracic aortas were treated with nobiletin before being stimulated with 20 ng/ml PDGF-BB, and rats were subjected to carotid artery injury. Nobiletin inhibited PDGF-BB-induced VSMC proliferation and migration, attenuated reactive oxygen species (ROS) production and reduced phosphorylation of ERK1/2 and the expression of nuclear NF-κB p65 in PDGF-BB-stimulated VSMCs. Nobiletin decreased the intima area and the ratio of neointima to media in balloon-injured rat carotid arteries. Serum levels of TNF-α and IL-6 in nobiletin-treated rats were decreased. These results indicated that nobiletin could be a potential protective agent for the prevention and treatment of restenosis after angioplasty.
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Affiliation(s)
- Siyu Guan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China; Department of Cardiology, Xiangyang Central Hospital, Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, 441021, China
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18
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Transcription factor cAMP response element modulator (Crem) restrains Pdgf-dependent proliferation of vascular smooth muscle cells in mice. Pflugers Arch 2014; 467:2165-77. [PMID: 25425331 PMCID: PMC4564437 DOI: 10.1007/s00424-014-1652-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 11/10/2014] [Accepted: 11/10/2014] [Indexed: 12/26/2022]
Abstract
Transcription factors of the cAMP response element-binding protein (Creb)/cAMP response element modulator (Crem) family were linked to the switch from a contractile to a proliferating phenotype in vascular smooth muscle cells (VSMCs). Here, we analyzed the vascular function of Crem in mice with a global inactivation of Crem (Crem(-/-)). CRE-mediated transcriptional activity was enhanced in primary Crem(-/-) VSMCs under nonstimulated conditions and under stimulation with Forskolin and platelet-derived growth factor (Pdgf) whereas stimulation with nitric oxide or cGMP showed no effect. This elevated CRE-mediated transcriptional activity as a result of Crem inactivation did not alter aortic contractility or fractions of proliferating or apoptotic aortic VSMCs in situ, and no impact of Crem inactivation on the development of atherosclerotic plaques was observed. Crem(-/-) mice exhibited an increased neointima formation after carotid ligation associated with an increased proliferation of VSMCs in the carotid media. Pdgf-stimulated proliferation of primary aortic Crem(-/-) VSMCs was increased along with an upregulation of messenger RNA (mRNA) levels of Pdgf receptor, alpha polypeptide (Pdgfra), cyclophilin A (Ppia), the regulator of G-protein signaling 5 (Rgs5), and Rho GTPase-activating protein 12 (Arhgap12). Taken together, our data reveal the inhibition of Pdgf-stimulated proliferation of VSMCs by repressing the Pdgf-stimulated CRE-mediated transcriptional activation as the predominant function of Crem in mouse vasculature suggesting an important role of Crem in vasculoproliferative diseases.
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Resveratrol inhibits phenotypic switching of neointimal vascular smooth muscle cells after balloon injury through blockade of Notch pathway. J Cardiovasc Pharmacol 2014; 63:233-9. [PMID: 24603118 DOI: 10.1097/fjc.0000000000000040] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND Phenotypic switching of vascular smooth muscle cells (VSMCs) plays an initial role in neointimal hyperplasia, the main cause of many occlusive vascular diseases. The aim of this study was to measure the effects of resveratrol (RSV) on the phenotypic transformation of VSMCs and to investigate its mechanism of action. METHODS Cultured VSMCs isolated from rat thoracic aorta were prepared with serum starvation for 72 hours followed by RSV treatment (50-200 μmol/L) and 10% serum stimulation. Male Sprague-Dawley rats, subjected to carotid arteries injury from a balloon catheter, were exposed to intraperitoneal injection of RSV (1 mg/kg) or saline and were killed after 7 or 28 days. RESULTS Compared with cells in the serum-induced group, VSMCs in the RSV or N-[N-(3, 5-Difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester (DAPT) treatment group exhibited significant decreases of proliferation and migration. The total and cytoplasmic Notch-1 levels were declined by RSV, accompanied by a significant increase in smooth muscle α-actin and smooth muscle myosin heavy chain protein. The expression of Notch-1, Jagged-1, Hey-1, and Hey-2 mRNA in balloon-injured arteries at 7 days was decreased by RSV treatment. Arteries from RSV-treated rats showed less neointimal hyperplasia, lower collagen content, and a lower rate of cells positive for proliferating cell nuclear antigen 28 days after injury, compared with saline controls. CONCLUSIONS The results indicate that RSV can attenuate phenotypic switching of VSMCs after arterial injury through inhibition of the Notch pathway.
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20
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CREB is activated in smooth muscle cells isolated from atherosclerotic plaques and reduces smooth muscle cell proliferation via p21-dependent mechanism. Int J Cardiol 2014; 174:764-7. [DOI: 10.1016/j.ijcard.2014.04.078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 04/04/2014] [Indexed: 11/22/2022]
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21
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Molnar P, Perrault R, Louis S, Zahradka P. The cyclic AMP response element-binding protein (CREB) mediates smooth muscle cell proliferation in response to angiotensin II. J Cell Commun Signal 2013; 8:29-37. [PMID: 24327051 DOI: 10.1007/s12079-013-0215-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 11/14/2013] [Indexed: 10/25/2022] Open
Abstract
The cAMP response element-binding protein (CREB) is a transcription factor that mediates the cellular response to metabolic and mitogenic signals. Whether CREB contributes to vascular function has received little attention, especially in relation to the processes associated with atherosclerotic disease progression and restenosis. This study examined the involvement of CREB in the mitogenic actions of angiotensin II (AngII), a growth factor that promotes neointimal hyperplasia in response to vascular injury. Treatments were performed on quiescent vascular smooth muscle cells (VSMCs) obtained from a porcine explant model. Organ culture was performed on porcine hearts subjected to angioplasty ex vivo. Stimulation of VSMCs with AngII resulted in transient CREB phosphorylation. Proliferation of smooth muscle cells in response to AngII was reduced by 90 % after infection with adenovirus expressing dominant-negative killer CREB (kCREB) mutant. Likewise, expression of kCREB prevented angioplasty-induced neointimal hyperplasia. AngII-induced CREB phosphorylation was independent of cAMP activation. Examination of putative CREB kinases revealed that MSK was responsible for phosphorylating CREB. In addition, inhibition of PKC revealed that this kinase operates upstream and activates MSK. These results indicate that activation of CREB via PKC and MSK is essential for SMC proliferation in response to AngII.
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Affiliation(s)
- Peter Molnar
- Department of Physiology, University of Manitoba, Winnipeg, MB, Canada
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22
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Li L, Howell K, Sands M, Banahan M, Frohlich S, Rowan SC, Neary R, Ryan D, McLoughlin P. The α and Δ isoforms of CREB1 are required to maintain normal pulmonary vascular resistance. PLoS One 2013; 8:e80637. [PMID: 24349008 PMCID: PMC3857174 DOI: 10.1371/journal.pone.0080637] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 10/05/2013] [Indexed: 01/15/2023] Open
Abstract
Chronic hypoxia causes pulmonary hypertension associated with structural alterations in pulmonary vessels and sustained vasoconstriction. The transcriptional mechanisms responsible for these distinctive changes are unclear. We have previously reported that CREB1 is activated in the lung in response to alveolar hypoxia but not in other organs. To directly investigate the role of α and Δ isoforms of CREB1 in the regulation of pulmonary vascular resistance we examined the responses of mice in which these isoforms of CREB1 had been inactivated by gene mutation, leaving only the β isoform intact (CREB(αΔ) mice). Here we report that expression of CREB regulated genes was altered in the lungs of CREB(αΔ) mice. CREB(αΔ) mice had greater pulmonary vascular resistance than wild types, both basally in normoxia and following exposure to hypoxic conditions for three weeks. There was no difference in rho kinase mediated vasoconstriction between CREB(αΔ) and wild type mice. Stereological analysis of pulmonary vascular structure showed characteristic wall thickening and lumen reduction in hypoxic wild-type mice, with similar changes observed in CREB(αΔ). CREB(αΔ) mice had larger lungs with reduced epithelial surface density suggesting increased pulmonary compliance. These findings show that α and Δ isoforms of CREB1 regulate homeostatic gene expression in the lung and that normal activity of these isoforms is essential to maintain low pulmonary vascular resistance in both normoxic and hypoxic conditions and to maintain the normal alveolar structure. Interventions that enhance the actions of α and Δ isoforms of CREB1 warrant further investigation in hypoxic lung diseases.
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Affiliation(s)
- Lili Li
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Katherine Howell
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Michelle Sands
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Mark Banahan
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Stephen Frohlich
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
- Department of Anaesthesia and Critical Care, St Vincent's University Hospital, Dublin, Ireland
| | - Simon C. Rowan
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Roisín Neary
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
| | - Donal Ryan
- Department of Anaesthesia and Critical Care, St Vincent's University Hospital, Dublin, Ireland
| | - Paul McLoughlin
- University College Dublin, School of Medicine and Medical Sciences, Conway Institute, Dublin, Ireland
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23
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Chen J, Xu L, Huang C. DHEA inhibits vascular remodeling following arterial injury: a possible role in suppression of inflammation and oxidative stress derived from vascular smooth muscle cells. Mol Cell Biochem 2013; 388:75-84. [PMID: 24287563 DOI: 10.1007/s11010-013-1900-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 11/15/2013] [Indexed: 12/01/2022]
Abstract
Vascular remodeling is characterized by the aggregation of vascular smooth muscle cells (VSMCs) in intima. Previous studies have demonstrated that dehydroepiandrosterone (DHEA), a steroid hormone, can reverse vascular remodeling. However, it is still far clear that whether and how DHEA participates in the modulation of VSMCs activation and vascular remodeling. VSMCs were obtained from the thoracic aorta of SD rats. Cell proliferation was evaluated by CCK-8 assay and BrdU assay. To measure VSMCs migration activity, a transwell chamber assay was performed. Quantitative real-time RT-PCR and western blot were used to explore the molecular mechanisms. ROS generation by VSMCs was measured by DCF fluorescence. NADPH oxidase activity and SOD activity were measured by the corresponding kits. NF-κB activity was detected by NF-κB luciferase reporter gene assay. A rat carotid artery balloon injury model was built to evaluate the neointimal formation, and plasma PGF2 was measured by ELISA. Our results showed that DHEA significantly inhibited VSMCs proliferation after angiotensin (Ang II) stimulation by down-regulation of NADPH oxidase activity and ERK1/2 phosphorylation. Ang II can increase IL-6 and MCP-1 expression, but DHEA reverses these changes via inhibiting p38-MAPK/NF-κB (p65) signaling pathway. DHEA has no significant effects on VSMCs phenotype transition, but can reduce the neointimal to media area ratio after balloon injury. DHEA can alleviate oxidative stress and inflammation in VSMCs via ERK1/2 and NF-κB signaling pathway, but has no effect on VSMCs phenotype transition. Furthermore, DHEA attenuates VSMCs activation and neointimal formation after carotid injury in vivo. Taken together, DHEA might be a promising treatment for vascular injury under pathological condition.
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Affiliation(s)
- Jiangbin Chen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, 430060, People's Republic of China
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24
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Li-Sha G, Yi-He C, Na-Dan Z, Teng Z, Yue-Chun L. Effects of carvedilol treatment on cardiac cAMP response element binding protein expression and phosphorylation in acute coxsackievirus B3-induced myocarditis. BMC Cardiovasc Disord 2013; 13:100. [PMID: 24225056 PMCID: PMC3840656 DOI: 10.1186/1471-2261-13-100] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Accepted: 11/12/2013] [Indexed: 11/21/2022] Open
Abstract
Background The role of β-adrenergic stimulation on viral myocarditis has been investigated in animal models of viral myocarditis. Excess stimulation of β-adrenergic receptors by catecholamines causes phosphorylation/activation of cAMP response element binding protein (CREB) by the cAMP signaling pathway. CREB as an important regulator of gene expression mediates the cardiovascular remodeling process and promotes anti-inflammatory immune responses. However, the CREB expression and phosphorylation have not been studied, and the effects of carvedilol (a nonselective β-adrenoceptor antagonist) on the CREB has not been investigated in the setting of acute viral myocarditis. Methods This study was therefore designed to examine the effects of carvedilol on the transcriptional factor CREB in a murine model of acute viral myocarditis. In a coxsackievirus B3 murine myocarditis model (Balb/c), effects of carvedilol on plasma noradrenaline, heart rate and blood pressure, myocardial histopathological changes and fibrosis, cardiomyocyte apoptosis, cardiac CREB and phosphorylated CREB, cytokine levels, and viral RNA were studied. Results The expression and phosphorylation of CREB were decreased with concomitant increase of IL-6 and TNF-α in murine coxsackievirus-induced acute viral myocarditis. The levels of IL-6 and TNF-α were correlated with the expression of CREB or phosphorylated CREB. Carvedilol increased the cardiac CREB expression and phosphorylation and decreased the plasma catecholamine levels and the production of IL-6 and TNF-α with amelioration of acute viral myocarditis. Conclusion These results show that CREB may be involved in the pathophysiology of viral myocarditis and carvedilol exerts some of its beneficial effects by increasing the CREB expression and phosphorylation.
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Affiliation(s)
| | | | | | | | - Li Yue-Chun
- Department of Cardiology, Second Affiliated Hospital of Wenzhou Medical College, Wenzhou 325000, China.
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25
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Nakanishi K, Saito Y, Azuma N, Sasajima T. Cyclic adenosine monophosphate response-element binding protein activation by mitogen-activated protein kinase-activated protein kinase 3 and four-and-a-half LIM domains 5 plays a key role for vein graft intimal hyperplasia. J Vasc Surg 2012; 57:182-93, 193.e1-10. [PMID: 23127979 DOI: 10.1016/j.jvs.2012.06.082] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 06/07/2012] [Accepted: 06/09/2012] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Intimal hyperplasia (IH) is the main cause of vein graft stenosis or failure after bypass surgery. Basic investigations are proceeding in an animal model of mechanically desquamated arteries, and numerous molecules for potential IH treatments have been identified; however, neither insights into the mechanism of IH nor substantially effective treatments for its suppression have been developed. The goals of the present study are to use human vein graft samples to identify therapeutic target genes that control IH and to investigate the therapeutic efficacy of these candidate molecules in animal models. METHODS Using microarray analysis of human vein graft samples, we identified two previously unrecognized IH-related genes, mitogen-activated protein kinase-activated protein kinase 3 (MAPKAPK3) and four-and-a-half LIM domains 5 (FHL5). RESULTS Transfer of either candidate gene resulted in significantly elevated vascular smooth muscle cell (VSMC) proliferation and migration. Interestingly, cotransfection of both genes increased VSMC proliferation in an additive manner. These genes activated cyclic adenosine monophosphate response-element (CRE) binding protein (CREB), but their mechanisms of activation were different. MAPKAPK3 phosphorylated CREB, but FHL5 bound directly to CREB. A CREB dominant-negative protein, KCREB, which blocks its ability to bind CRE, repressed VSMC proliferation and migration. In a wire-injury mouse model, gene transfer of KCREB plasmid significantly repressed IH. In this vessel tissue, CRE-activated gene expression was repressed. Furthermore, we confirmed the changes in MAPKAPK3 and FHL5 expression using vein graft samples from eight patients. CONCLUSIONS We successively identified two previously unrecognized IH activators, MAPKAPK3 and FHL5, using human vein graft samples. Gene transfer of KCREB repressed IH in an animal model. Inhibition of CREB function is a promising gene therapy strategy for IH.
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Affiliation(s)
- Keisuke Nakanishi
- Department of Surgery, Asahikawa Medical University, Hokkaido, Japan
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26
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Chen J, Zhang J, Xu L, Xu C, Chen S, Yang J, Jiang H. Inhibition of neointimal hyperplasia in the rat carotid artery injury model by a HMGB1 inhibitor. Atherosclerosis 2012; 224:332-9. [PMID: 22857898 DOI: 10.1016/j.atherosclerosis.2012.07.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 05/01/2012] [Accepted: 07/12/2012] [Indexed: 02/07/2023]
MESH Headings
- Angiotensin II/metabolism
- Animals
- Anti-Inflammatory Agents/pharmacology
- Antioxidants/pharmacology
- Cardiovascular Agents/pharmacology
- Carotid Arteries/drug effects
- Carotid Arteries/metabolism
- Carotid Arteries/pathology
- Carotid Artery Injuries/drug therapy
- Carotid Artery Injuries/metabolism
- Carotid Artery Injuries/pathology
- Cell Differentiation/drug effects
- Cell Movement/drug effects
- Cell Proliferation/drug effects
- Cells, Cultured
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Glycyrrhizic Acid/pharmacology
- HMGB1 Protein/antagonists & inhibitors
- HMGB1 Protein/metabolism
- Hyperplasia
- Inflammation Mediators/metabolism
- Male
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/injuries
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- NF-kappa B/metabolism
- Neointima
- Oxidative Stress/drug effects
- Phenotype
- Rats
- Rats, Sprague-Dawley
- Receptors, Notch/metabolism
- Signal Transduction/drug effects
- Time Factors
- p38 Mitogen-Activated Protein Kinases/metabolism
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Affiliation(s)
- Jing Chen
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan 430060, China
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27
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Laaksamo E, Ramachandran M, Frösen J, Tulamo R, Baumann M, Friedlander RM, Harbaugh RE, Hernesniemi J, Niemelä M, Raghavan ML, Laakso A. Intracellular signaling pathways and size, shape, and rupture history of human intracranial aneurysms. Neurosurgery 2012; 70:1565-72; discussion 1572-3. [PMID: 22278358 DOI: 10.1227/neu.0b013e31824c057e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Size and morphological features are associated with intracranial aneurysm (IA) rupture. The cellular mechanisms of IA development and rupture are poorly known. OBJECTIVE We studied the expression and phosphorylation of different intracellular signaling molecules in the IA wall compared with IA morphological features to understand better the cellular pathways involved in IA development and wall degeneration. METHODS Nine ruptured and 17 unruptured human IA samples were collected intraoperatively. The expression levels and phosphorylation state of 3 mitogen-activated protein kinases (c-Jun N-terminal kinase [JNK], p38, extracellular signal-regulated kinase [ERK]), Bcl-2 antagonist of cell death (Bad), mammalian target of rapamycin (mTOR), cyclic AMP response element binding protein (CREB), and Akt were determined by Western blotting. The localization of signaling proteins was determined by immunofluorescence. From 3-dimensional segmentation of computed tomography angiographic data, size and shape indexes were calculated. RESULTS We found a 5-fold difference in phospho-Bad levels between ruptured and unruptured IAs. Phospho-mTOR was downregulated 2.5-fold in ruptured IAs. Phospho-p54 JNK, phospho-p38, and phospho-Akt levels correlated positively with IA size. Phospho-CREB levels were significantly associated with nonsphericity and ellipticity indexes. Phospho-Akt and phospho-p38 correlated negatively with undulation index. CONCLUSION The signaling pathway profile (apoptosis, cell proliferation, stress signaling) differs between ruptured and unruptured IAs and is associated with IA geometry. Our results increase the knowledge of IA development and wall degeneration.
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Affiliation(s)
- Elisa Laaksamo
- Neurosurgery Research Group, Biomedicum, Helsinki, Finland
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28
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Calcium signaling in vascular smooth muscle cells: from physiology to pathology. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 740:795-810. [PMID: 22453970 DOI: 10.1007/978-94-007-2888-2_35] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cyclic variations in calcium (Ca(2+)) concentrations, through a process called excitation-contraction coupling, allow regulation of vascular smooth muscle cells contractility and thus modulation of vascular tone and blood pressure. As a second messenger, Ca(2+) also activates signaling cascades leading to transcription factors activation in a process called excitation-transcription coupling. Furthermore, recent evidences indicate an interaction between post-transcriptional regulation by microRNAs (miRNAs) and Ca(2+) signaling. All these actors, which are frequently altered in vascular diseases, will be reviewed here.
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29
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30
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Chen WJ, Chen YH, Lin KH, Ting CH, Yeh YH. Cilostazol promotes vascular smooth muscles cell differentiation through the cAMP response element-binding protein-dependent pathway. Arterioscler Thromb Vasc Biol 2011; 31:2106-13. [PMID: 21680899 DOI: 10.1161/atvbaha.111.230987] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Cilostazol, a potent type 3 phosphodiesterase inhibitor, has recently been found to reduce neointimal formation by inhibiting vascular smooth muscle cell (VSMC) proliferation. The aim of this study is to investigate whether cilostazol exerts an action on phenotypic modulation of VSMCs, another important process in the pathogenesis of neointimal formation. METHODS AND RESULTS Cilostazol may convert VSMCs from a serum-induced dedifferentiation state to a differentiated state, as indicated by a spindle-shaped morphology and an increase in the expression of smooth muscle cell differentiation marker contractile proteins. The upregulation of contractile proteins by cilostazol involves the cAMP/protein kinase A (PKA) signaling pathway, because the cAMP analog mimicked and specific cAMP/PKA inhibitors opposed the effect of cilostazol. Furthermore, cilostazol-activated cAMP response element (CRE)-binding protein (CREB), including phosphorylation at Ser133 and its nuclear translocation. Deletion and mutational analysis of the contractile protein promoters along with chromatin immunoprecipitation using anti-CREB antibody showed that CRE is essential for cilostazol-induced contractile protein expression. Transfection of dominant-negative CREB (mutated Ser133) plasmid in VSMCs blocked cilostazol-stimulated contractile protein expression. In vivo, cilostazol upregulated contractile proteins and induced the activation of CREB in the neointima of balloon-injured arteries. CONCLUSIONS Cilostazol promotes VSMC differentiation through the cAMP/PKA/CREB signaling cascade.
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Affiliation(s)
- Wei-Jan Chen
- First Cardiovascular Division, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Tao-Yuan, Taiwan.
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31
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Grossmann C, Ruhs S, Seiferth A, Gekle M. Interaction between mineralocorticoid receptor and cAMP/CREB signaling. Steroids 2010; 75:539-43. [PMID: 19879890 DOI: 10.1016/j.steroids.2009.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Revised: 10/19/2009] [Accepted: 10/20/2009] [Indexed: 02/03/2023]
Abstract
Besides regulating water and electrolyte homeostasis, the mineralocorticoid receptor (MR) elicits pathophysiological effects in the renocardiovascular system. Although the MR's closest relative, the glucocorticoid receptor (GR), acts as a transcription factor at the same hormone-response-element (HRE), activated glucocorticoid receptor mediates very different effects. One explanation for this discrepancy is that the MR interacts with additional signaling pathways in the cytosol. In the literature, there are several indications for an interaction between aldosterone/MR and the cAMP/CREB signaling. Here we summarize the current knowledge of the cross-talk between the two signaling pathways, including some unpublished observations of our own that indicate that MR/CREB signaling is mediated by calcineurin and has potentially pathophysiological consequences.
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Affiliation(s)
- Claudia Grossmann
- Julius-Bernstein-Institute of Physiology, Martin-Luther-University Halle-Wittenberg, Magdeburger Str. 6, 06097 Halle (Saale), Germany.
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32
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Schauer IE, Knaub LA, Lloyd M, Watson PA, Gliwa C, Lewis KE, Chait A, Klemm DJ, Gunter JM, Bouchard R, McDonald TO, O'Brien KD, Reusch JEB. CREB downregulation in vascular disease: a common response to cardiovascular risk. Arterioscler Thromb Vasc Biol 2010; 30:733-41. [PMID: 20150559 PMCID: PMC2841720 DOI: 10.1161/atvbaha.109.199133] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVE To examine the impact of low-density lipoprotein (LDL), an established mediator of atherosclerosis, on the transcription factor cAMP-response element-binding protein (CREB), which is a regulator of vascular smooth muscle cell (VSMC) quiescence. METHODS AND RESULTS VSMC CREB content is diminished in rodent models of diabetes and pulmonary hypertension. We examined aortic CREB content in rodent models of aging, hypertension, and insulin resistance, and we determined nuclear CREB protein in the medial VSMC of high-fat-fed LDL receptor-null mice. There was significant loss of CREB protein in all models. In vitro, primary culture rat aortic VSMC exposed to LDL and oxidized LDL exhibited a rapid, transient increase in CREB phosphorylation and transient phosphorylation/activation of Akt, ERK, JNK, ans p38 MAPK. Exposure to oxidized LDL, but not to LDL, for 24 to 48 hours decreased CREB protein in a dose-dependent fashion and led to nuclear exclusion of CREB. Pharmacological reactive oxygen species scavengers and inhibition of ERK activation blocked oxidized LDL-mediated CREB downregulation. CONCLUSIONS These data support a model wherein loss of VSMC CREB protein, which renders these cells more susceptible to activation and apoptosis, is a common pathological response to vascular injury and potentially contributes to plaque progression.
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MESH Headings
- Age Factors
- Aging/metabolism
- Animals
- Aorta/metabolism
- Atherosclerosis/metabolism
- Atherosclerosis/physiopathology
- Cell Nucleus/metabolism
- Cells, Cultured
- Cyclic AMP Response Element-Binding Protein/metabolism
- Dietary Fats/administration & dosage
- Disease Models, Animal
- Down-Regulation
- Enzyme Activation
- Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Female
- Free Radical Scavengers/pharmacology
- Heart Failure/etiology
- Heart Failure/metabolism
- Heart Failure/physiopathology
- Hypertension/complications
- Hypertension/metabolism
- Hypertension/physiopathology
- Insulin Resistance
- JNK Mitogen-Activated Protein Kinases/metabolism
- Lipoproteins, LDL/metabolism
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiopathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Phosphorylation
- Protein Kinase Inhibitors/pharmacology
- Proto-Oncogene Proteins c-akt/metabolism
- Rats
- Rats, Inbred SHR
- Rats, Sprague-Dawley
- Reactive Oxygen Species/metabolism
- Receptors, LDL/antagonists & inhibitors
- Receptors, LDL/deficiency
- Receptors, LDL/genetics
- Risk Assessment
- Time Factors
- p38 Mitogen-Activated Protein Kinases/metabolism
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Affiliation(s)
- Irene E Schauer
- Department of Medicine, University of Colorado at Denver-Anschutz Medical Campus, Aurora, CO, USA
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33
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CBP knockdown inhibits angiotensin II-induced vascular smooth muscle cells proliferation through downregulating NF-kB transcriptional activity. Mol Cell Biochem 2010; 340:55-62. [PMID: 20157765 DOI: 10.1007/s11010-010-0400-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Accepted: 02/03/2010] [Indexed: 12/22/2022]
Abstract
CREB binding protein (CBP), a powerful transcriptional co-activator for various transcriptional factors, regulates cell behavior in many cell types. Angiotensin II (Ang II) contributes to vascular lesion by promoting vascular smooth muscle cells (VSMCs) proliferation and migration. Therefore, we examined whether CBP knockdown could suppress Ang II-induced VSMCs proliferation, and elucidated its underlying molecular mechanism. We constructed lentiviral vector expressing CBP-specific short hairpin RNAs (shRNAs) that efficiently silenced CBP. VSMCs proliferation was evaluated by bromodeoxyuridine (BrdU) incorporation assay. Protein and mRNA expression of CBP and relevant cytokines were examined by Western blot, ELISA, and real-time PCR, respectively. We also used luciferase reporter gene and electrophoretic mobility shift assay (EMSA) to detect Nuclear factor kappaB (NF-kB) transcriptional activity and DNA binding. Meanwhile, NF-kB p65 subunit nuclear translocation was confirmed by immunoblotting. Lentiviral-mediated CBP-shRNAs at different multiplicities of infection (MOI = 100, 150) both significantly suppressed Ang II-induced CBP expression. Knockdown of CBP markedly inhibited Ang II-stimulated VSMCs proliferation and cytokines (TNF-alpha and IL-6) production. However, this inhibitory effect was not enhanced at MOI of 150 compared with MOI of 100 (P > 0.05). CBP siRNA showed the potent inhibition on Ang II-induced NF-kB transcriptional activity. Similarly, no significant difference was found between CBP siRNA lentivirus treatment groups. Furthermore, CBP gene silencing had no effect on NF-kB nuclear translocation and DNA binding. These findings suggest that CBP knockdown inhibits Ang II-induced VSMCs proliferation and the mechanism is involved with downregulation of NF-kB transcriptional activity, not through reduction in NF-kB nuclear translocation or DNA binding. Maintaining proper CBP level may be a potential therapeutic target for Ang II-induced cardiovascular disorders.
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34
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Ozgen N, Guo J, Gertsberg Z, Danilo P, Rosen MR, Steinberg SF. Reactive oxygen species decrease cAMP response element binding protein expression in cardiomyocytes via a protein kinase D1-dependent mechanism that does not require Ser133 phosphorylation. Mol Pharmacol 2009; 76:896-902. [PMID: 19620255 DOI: 10.1124/mol.109.056473] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Reactive oxygen species (ROS) exert pleiotropic effects on a wide array of signaling proteins that regulate cellular growth and apoptosis. This study shows that long-term treatment with a low concentration of H2O2 leads to the activation of signaling pathways involving extracellular signal-regulated kinase, ribosomal protein S6 kinase, and protein kinase D (PKD) that increase cAMP binding response element protein (CREB) phosphorylation at Ser(133) in cardiomyocytes. Although CREB-Ser(133) phosphorylation typically mediates cAMP-dependent increases in CREB target gene expression, the H2O2-dependent increase in CREB-Ser(133) phosphorylation is accompanied by a decrease in CREB protein abundance and no change in Cre-luciferase reporter activity. Mutagenesis studies indicate that H2O2 decreases CREB protein abundance via a mechanism that does not require CREB-Ser(133) phosphorylation. Rather, the H2O2-dependent decrease in CREB protein is prevented by the proteasome inhibitor lactacystin, by inhibitors of mitogen-activated protein kinase kinase or protein kinase C activity, or by adenoviral-mediated delivery of a small interfering RNA that decreases PKD1 expression. A PKD1-dependent mechanism that links oxidative stress to decreased CREB protein abundance is predicted to contribute to the pathogenesis of heart failure by influencing cardiac growth and apoptosis responses.
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Affiliation(s)
- Nazira Ozgen
- Center for Molecular Therapeutics, Department of Pharmacology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
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35
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Chava KR, Karpurapu M, Wang D, Bhanoori M, Kundumani-Sridharan V, Zhang Q, Ichiki T, Glasgow WC, Rao GN. CREB-mediated IL-6 expression is required for 15(S)-hydroxyeicosatetraenoic acid-induced vascular smooth muscle cell migration. Arterioscler Thromb Vasc Biol 2009; 29:809-15. [PMID: 19342597 PMCID: PMC2724759 DOI: 10.1161/atvbaha.109.185777] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Migration of vascular smooth muscle cells (VSMCs) from media to intima is a key event in the pathophysiology of atherosclerosis and restenosis. The lipoxygenase products of polyunsaturated fatty acids (PUFA) were shown to play a role in these diseases. cAMP response element binding protein (CREB) has been implicated in the regulation of VSMC growth and motility in response to thrombin and angiotensin II. The aim of the present study was to test the role of CREB in an oxidized lipid molecule, 15(S)-HETE-induced VSMC migration and neointima formation. METHODS AND RESULTS 15(S)-HETE stimulated VSMC migration in CREB-dependent manner, as measured by the modified Boyden chamber method. Blockade of MEK1, JNK1, or p38MAPK inhibited 15(S)-HETE-induced CREB phosphorylation and VSMC migration. 15(S)-HETE induced expression and secretion of interleukin-6 (IL-6), as analyzed by RT-PCR and ELISA, respectively. Neutralizing anti-IL-6 antibodies blocked 15(S)-HETE-induced VSMC migration. Dominant-negative mutant-mediated blockade of ERK1/2, JNK1, p38MAPK, or CREB suppressed 15(S)-HETE-induced IL-6 expression in VSMCs. Serial 5' deletions and site-directed mutagenesis of IL-6 promoter along with chromatin immunoprecipitation using anti-CREB antibodies showed that cAMP response element is essential for 15(S)-HETE-induced IL-6 expression. Dominant-negative CREB also suppressed balloon injury-induced IL-6 expression, SMC migration from media to intimal region, and neointima formation. Adenovirus-mediated transduction of 15-lipoxygenase 2 (15-LOX2) caused increased production of 15-HETE in VSMCs and enhanced IL-6 expression, SMC migration from media to intimal region, and neointima formation in response to arterial injury. CONCLUSIONS The above results suggest a role for 15-LOX2-15-HETE in the regulation of VSMC migration and neointima formation involving CREB-mediated IL-6 expression.
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MESH Headings
- Angioplasty, Balloon/adverse effects
- Animals
- Arachidonate 15-Lipoxygenase/genetics
- Arachidonate 15-Lipoxygenase/metabolism
- Carotid Artery Injuries/enzymology
- Carotid Artery Injuries/metabolism
- Carotid Artery Injuries/pathology
- Cell Movement
- Cells, Cultured
- Cyclic AMP Response Element-Binding Protein/genetics
- Cyclic AMP Response Element-Binding Protein/metabolism
- Disease Models, Animal
- Hydroxyeicosatetraenoic Acids/metabolism
- Interleukin-6/genetics
- Interleukin-6/metabolism
- MAP Kinase Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/metabolism
- Mitogen-Activated Protein Kinase 8/metabolism
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Mutation
- Myocytes, Smooth Muscle/enzymology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phosphorylation
- Promoter Regions, Genetic
- Rats
- Time Factors
- Transfection
- p38 Mitogen-Activated Protein Kinases/metabolism
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Affiliation(s)
- Koteswara R. Chava
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
| | - Manjula Karpurapu
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
| | - Dong Wang
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
| | - Manjula Bhanoori
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
| | | | - Qiuhua Zhang
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
| | - Toshihiro Ichiki
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan
| | - Wayne C. Glasgow
- Division of Basic Medical Sciences, Mercer University School of Medicine, Macon, GA 31207, USA
| | - Gadiparthi N. Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163
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Dysregulation of CREB binding protein triggers thrombin-induced proliferation of vascular smooth muscle cells. Mol Cell Biochem 2008; 315:123-30. [PMID: 18496732 DOI: 10.1007/s11010-008-9795-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 05/06/2008] [Indexed: 10/22/2022]
Abstract
Thrombin is a potent mitogen for vascular smooth muscle cells (VSMCs). CBP has been regarded as a potential therapeutic target on the basis of its ability to affect cell growth. Therefore we hypothesized that CBP mediates thrombin-induced proliferation of VSMCs. We constructed recombinant adenoviral vector that expresses four short hairpin RNA (shRNA) targeting rat CBP mRNA (CBP-shRNA/Ad). VSMCs were infected with CBP-shRNA/Ad and treated with thrombin. CBP level were analyzed by quantitative real-time PCR and Western blot. To evaluate VSMC proliferation, the cell cycle and DNA synthesis were analyzed by flow cytometry and (3)H-thymidine incorporation, respectively. CBP-shRNA/Ad infection inhibited thrombin-induced CBP expression in a dose-dependent manner concomitant with a decrease in the percentage of cells in the S phase and in DNA synthesis. These findings suggest that CBP plays a pivotal role in the S phase progression of VSMCs.
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CREB Activation and Ischaemic Preconditioning. Cardiovasc Drugs Ther 2008; 22:3-17. [DOI: 10.1007/s10557-007-6078-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Accepted: 12/14/2007] [Indexed: 01/12/2023]
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Ohtsubo H, Ichiki T, Miyazaki R, Inanaga K, Imayama I, Hashiguchi Y, Sadoshima J, Sunagawa K. Inducible cAMP early repressor inhibits growth of vascular smooth muscle cell. Arterioscler Thromb Vasc Biol 2007; 27:1549-55. [PMID: 17463330 DOI: 10.1161/atvbaha.107.145011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The role of inducible cAMP early repressor (ICER), a transcriptional repressor, in the vascular remodeling process has not been determined. We examined whether ICER affects growth of vascular smooth muscle cells (VSMCs). METHODS AND RESULTS Semi-quantitative RT-PCR and Western blot analysis showed that expression of ICER was increased in beraprost (a prostaglandin I2 analogue)-stimulated VSMCs in a time- and dose-dependent manner. The induction of ICER was inhibited by pretreatment with H89, a protein kinase A (PKA) inhibitor, suggesting that PKA mediates the induction of ICER expression. Beraprost suppressed platelet-derived growth factor-induced thymidine incorporation in VSMCs, which was reversed by transfection of short interfering RNA for ICER, not by scramble RNA. Overexpression of ICER by an adenovirus vector attenuated neointimal formation (intima/media ratio) by 50% compared with overexpression of LacZ. The number of terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling-positive cells was increased and the number of Ki-67-positive cells was decreased in ICER-transduced artery. CONCLUSION These results suggest that ICER induces apoptosis and inhibits proliferation of VSMCs, and plays a critical role in beraprost-mediated suppression of VSMC proliferation. ICER may be an important endogenous inhibitor of vascular proliferation.
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MESH Headings
- Analysis of Variance
- Animals
- Aorta, Thoracic/cytology
- Apoptosis/drug effects
- Apoptosis/physiology
- Blotting, Western
- Cell Proliferation/drug effects
- Cells, Cultured
- Cyclic AMP Response Element Modulator/drug effects
- Cyclic AMP Response Element Modulator/metabolism
- Disease Models, Animal
- Epoprostenol/analogs & derivatives
- Epoprostenol/antagonists & inhibitors
- Epoprostenol/pharmacology
- In Situ Nick-End Labeling
- Male
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/growth & development
- Probability
- RNA, Messenger/analysis
- Rats
- Rats, Sprague-Dawley
- Reverse Transcriptase Polymerase Chain Reaction
- Sensitivity and Specificity
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Affiliation(s)
- Hideki Ohtsubo
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashiku, 812-8582 Fukuoka, Japan
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Kamiya K, Sakakibara K, Ryer EJ, Hom RP, Leof EB, Kent KC, Liu B. Phosphorylation of the cyclic AMP response element binding protein mediates transforming growth factor beta-induced downregulation of cyclin A in vascular smooth muscle cells. Mol Cell Biol 2007; 27:3489-98. [PMID: 17325033 PMCID: PMC1899963 DOI: 10.1128/mcb.00665-06] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Transforming growth factor beta (TGFbeta), a multifunctional cytokine associated with vascular injury, is a potent inhibitor of cell proliferation. The current results demonstrate that the TGFbeta-induced growth arrest of vascular smooth muscle cells (VSMCs) is associated with cyclin A downregulation. TGFbeta represses the cyclin A gene through a cyclic AMP (cAMP) response element, which complexes with the cAMP response element binding protein (CREB). The CREB-cyclin A promoter interaction is hindered by TGFbeta, preceded by a TGFbeta receptor-dependent CREB phosphorylation. Induction of CREB phosphorylation with forskolin or 6bnz-cAMP mimics TGFbeta's inhibitory effect on cyclin A expression. Conversely, inhibition of CREB phosphorylation with a CREB mutant in which the phosphorylation site at serine 133 was changed to alanine (CREB-S133A) upregulated cyclin A gene expression. Furthermore, the CREB-S133A mutant abolished TGFbeta-induced CREB phosphorylation, cyclin A downregulation, and growth inhibition. Since we have previously shown that the novel PKC isoform protein kinase C delta (PKCdelta) is activated by TGFbeta in VSMCs, we tested the role of this kinase in CREB phosphorylation and cyclin A downregulation. Inhibition of PKCdelta by a dominant-negative mutant or by targeted gene deletion blocked TGFbeta-induced CREB phosphorylation and cyclin A downregulation. Taken together, our data indicate that phosphorylation of CREB stimulated by TGFbeta is a critical step leading to the inhibition of cyclin A expression and, thus, VSMC proliferation.
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Affiliation(s)
- Kentaro Kamiya
- Department of Surgery, Weill Cornell Medical College of Cornell University, New York, NY 1002, USA
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40
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Wang AB, Li HL, Zhang R, She ZG, Chen HZ, Huang Y, Liu DP, Liang CC. A20 attenuates vascular smooth muscle cell proliferation and migration through blocking PI3k/Akt singling in vitro and in vivo. J Biomed Sci 2007; 14:357-71. [PMID: 17260188 DOI: 10.1007/s11373-007-9150-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2006] [Accepted: 01/02/2007] [Indexed: 10/23/2022] Open
Abstract
A20 was originally characterized as a TNF-inducible gene in human umbilical vein endothelial cells. It is also induced in many other cell types by a wide range of stimuli. Expression of A20 has been shown to protect from TNF-induced apoptosis and also functions via a negative-feedback loop to block NF-kappaB activation induced by TNF and other stimuli. However, there are no reports on whether A20 can inhibit vascular smooth muscle cell proliferation in vivo. Here, we examined the effects of A20 on neointimal formation after balloon injury and TNF-alpha-induced vascular smooth muscle cells (VSMCs) proliferation and migration, as well as related molecular mechanisms in vitro and in vivo. We introduced adenovirus expressing A20 or GFP into rat carotid arterial segments after balloon injury. The effects of A20 were evaluated 14 days after gene delivery with morphometry and immunohistochemical staining for proliferating and apoptotic cells. Ad-A20 infection resulted in a significantly lower intima to media ratio and a greater lumen area compared with Ad-GFP infected group. Proliferation index was significantly reduced 14 days in Ad-A20 infection group. However, apoptotic index and caspase-3 activity were not significantly different between any groups at 14 days. In vitro experiments were performed to show that A20 markedly inhibited TNF-alpha-induced proliferation and migration in VSMCs. Further studies showed that A20 expression blocked artery injury- and TNF-alpha-activated PI3K/Akt/GSK3beta/CREB pathway in vivo and in vitro. In conclusion, A20 attenuates neointimal formation after arterial injury as well as cell proliferation and migration in response to TNF-alpha in VSMCs through blocking PI3K/Akt/GSKbeta-dependent activation of CREB.
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Affiliation(s)
- Ai-Bing Wang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, PR China
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CHEN M, ICHIKI T, OHTSUBO H, IMAYAMA I, INANAGA K, MIYAZAKI R, SUNAGAWA K. Inhibition of Balloon Injury-Induced Neointimal Formation by Olmesartan and Pravastatin in Rats with Insulin Resistance. Hypertens Res 2007; 30:971-8. [DOI: 10.1291/hypres.30.971] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Yonezawa T, Haga S, Kobayashi Y, Takahashi T, Obara Y. Visfatin is present in bovine mammary epithelial cells, lactating mammary gland and milk, and its expression is regulated by cAMP pathway. FEBS Lett 2006; 580:6635-43. [PMID: 17123517 DOI: 10.1016/j.febslet.2006.11.014] [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] [Received: 09/18/2006] [Revised: 11/02/2006] [Accepted: 11/03/2006] [Indexed: 11/21/2022]
Abstract
Visfatin was originally identified as a growth factor for immature B cells, and recently demonstrated to bind insulin receptor. Visfatin mRNA and protein were detected by RT-PCR and Western blot analysis in cloned bovine mammary epithelial cells, lactating bovine mammary gland and human breast cancer cell line, MCF-7. Immunocytochemical staining localized the visfatin protein in the cytosol and nucleus of both cells. Quantitative-RT-PCR analysis revealed that the expression of the visfatin mRNA was significantly elevated when treated with forskolin (500 microM), isopreterenol (1-10 microM) and dibutyric cyclic AMP (1 mM) for 24 h, and significantly reduced when treated with insulin (5-50 ng/ml) and dexsamethasone (0.5-250 nM) for 24 h. These results indicate that mammary epithelial cells express the visfatin protein and secrete them into the milk.
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Affiliation(s)
- Tomo Yonezawa
- Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Amamiyamachi, Sendai 981-8555, Japan.
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Nomiyama T, Nakamachi T, Gizard F, Heywood EB, Jones KL, Ohkura N, Kawamori R, Conneely OM, Bruemmer D. The NR4A orphan nuclear receptor NOR1 is induced by platelet-derived growth factor and mediates vascular smooth muscle cell proliferation. J Biol Chem 2006; 281:33467-76. [PMID: 16945922 PMCID: PMC1829169 DOI: 10.1074/jbc.m603436200] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Members of the nuclear hormone receptor superfamily function as key transcriptional regulators of inflammation and proliferation in cardiovascular diseases. In addition to the ligand-dependent peroxisome proliferator-activated receptors and liver X receptors, this family of transcription factors includes a large number of orphan receptors, and their role in vascular diseases remains to be investigated. The neuron-derived orphan receptor-1 (NOR1) belongs to the ligand-independent NR4A subfamily, which has been implicated in cell proliferation, differentiation, and apoptosis. In this study, we demonstrate NOR1 expression in vascular smooth muscle cells (SMC) of human atherosclerotic lesions. In response to mitogenic stimulation with platelet-derived growth factor (PDGF), SMC rapidly express NOR1 through an ERK-MAPK-dependent signaling pathway. 5'-deletion analysis, site-directed mutagenesis, and transactivation experiments demonstrate that PDGF-induced NOR1 expression is mediated through a cAMP-response element-binding protein (CREB)-dependent transactivation of the NOR1 promoter. Consequently, short interfering RNA-mediated depletion of CREB abolished PDGF-induced NOR1 expression in SMC. Furthermore, PDGF induced Ser-133 phosphorylation of CREB and subsequent binding to the CRE sites of the endogenous NOR1 promoter. Functional analysis demonstrated that PDGF induces NOR1 transactivation of its consensus NGFI-B-response elements (NBRE) in SMC. We finally demonstrate that SMC isolated from NOR1-deficient mice exhibit decreased cell proliferation and characterize cyclin D1 and D2 as NOR1 target genes in SMC. These experiments indicate that PDGF-induced NOR1 transcription in SMC is mediated through CREB-dependent transactivation of the NOR1 promoter and further demonstrate that NOR1 functions as a key transcriptional regulator of SMC proliferation.
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MESH Headings
- Animals
- Atherosclerosis/metabolism
- Cell Proliferation
- Cells, Cultured
- Cyclic AMP Response Element-Binding Protein/genetics
- Cyclic AMP Response Element-Binding Protein/metabolism
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- Gene Expression Regulation
- Humans
- MAP Kinase Signaling System
- Mitogen-Activated Protein Kinases/metabolism
- Molecular Sequence Data
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Nerve Tissue Proteins/genetics
- Nerve Tissue Proteins/metabolism
- Phosphoserine/metabolism
- Platelet-Derived Growth Factor/pharmacology
- Promoter Regions, Genetic/genetics
- Protein Binding
- RNA, Messenger/genetics
- Rats
- Receptors, Steroid/genetics
- Receptors, Steroid/metabolism
- Receptors, Thyroid Hormone/genetics
- Receptors, Thyroid Hormone/metabolism
- Response Elements
- Transcription, Genetic/genetics
- Transcriptional Activation/genetics
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Affiliation(s)
- Takashi Nomiyama
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Takafumi Nakamachi
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Florence Gizard
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Elizabeth B. Heywood
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Karrie L. Jones
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Naganari Ohkura
- National Cancer Center Research Institute, Tumor Endocrinology Project, Tokyo 104-0045, Japan
| | - Ryuzo Kawamori
- Department of Medicine, Metabolism, and Endocrinology, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Orla M. Conneely
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030
| | - Dennis Bruemmer
- From the Division of Endocrinology and Molecular Medicine, University of Kentucky College of Medicine, Lexington, Kentucky 40536
- To whom correspondence should be addressed: Wethington Health Sciences Bldg., Rm. 575, 900 South Limestone St., Lexington, KY 40536-0200. Tel.: 859-323-4933(ext.81418);Fax:859-257-3646;E-mail:
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Frischknecht K, Greutert H, Weisshaupt C, Kaspar M, Yang Z, Luscher TF, Carrel TP, Tanner FC. Different Vascular Smooth Muscle Cell Apoptosis in the Human Internal Mammary Artery and the Saphenous Vein. J Vasc Res 2006; 43:338-46. [PMID: 16733369 DOI: 10.1159/000093606] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2005] [Accepted: 03/13/2006] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The remarkable patency of internal mammary artery (MA) grafts compared to saphenous vein (SV) grafts has been related to different biological properties of the two blood vessels. We examined whether proliferation and apoptosis of vascular smooth muscle cells (VSMC) from human coronary artery bypass vessels differ according to patency rates. METHODS AND RESULTS Proliferation rates to serum or platelet-derived growth factor (PDGF)-BB were lower in VSMC from MA than SV. Surface expression of PDGF beta-receptor was slightly lower, while that of alpha-receptor was slightly higher in MA than SV. Cell cycle distribution, expression of cyclin E, cdk2, p21, p27, p57, and cdk2 kinase activity were identical in PDGF-BB-stimulated cells from MA and SV. However, apoptosis rates were higher in MA than SV determined by lactate dehydrogenase release, DNA fragmentation, and Hoechst 33258 staining. Moreover, caspase inhibitors (Z-VAD-fmk, Boc-D-fmk) abrogated the different proliferation rates of VSMC from MA versus SV. Western blotting and GSK3-beta kinase assay revealed lower Akt activity in VSMC from MA versus SV, while total Akt expression was identical. Adenoviral transduction of a constitutively active Akt mutant abrogated the different proliferation rates of VSMC from MA versus SV. CONCLUSIONS Higher apoptosis rates due to lower Akt activity rather than different cell cycle regulation account for the lower proliferation of VSMC from MA as compared to SV. VSMC apoptosis may protect MA from bypass graft disease.
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Affiliation(s)
- Karin Frischknecht
- Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland
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Fukuyama K, Ichiki T, Imayama I, Ohtsubo H, Ono H, Hashiguchi Y, Takeshita A, Sunagawa K. Thyroid hormone inhibits vascular remodeling through suppression of cAMP response element binding protein activity. Arterioscler Thromb Vasc Biol 2006; 26:2049-55. [PMID: 16794221 DOI: 10.1161/01.atv.0000233358.87583.01] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Although accumulating evidences suggest that impaired thyroid function is a risk for ischemic heart disease, the molecular mechanism of anti-atherosclerotic effects of thyroid hormone is poorly defined. We examined whether thyroid hormone affects signaling pathway of angiotensin II (Ang II), which is critically involved in a broad aspect of cardiovascular disease process. METHODS AND RESULTS 3,3',5-triiodo-L-thyronine (T3) did not show a significant effect on Ang II-induced activation of extracellular signal-regulated protein kinase or p38 mitogen-activated protein kinase in vascular smooth muscle cells (VSMCs), whereas T3 inhibited Ang II-induced activation of cAMP response element (CRE) binding protein (CREB), a nuclear transcription factor involved in the vascular remodeling process. Coimmunoprecipitaion assay revealed the protein-protein interaction between thyroid hormone receptor and CREB. T3 reduced an expression level of interleukin (IL)-6 mRNA, CRE-dependent promoter activity, and protein synthesis induced by Ang II. Administration of T3 (100 microg/100 g for 14 days) to rats attenuated neointimal formation after balloon injury of carotid artery with reduced CREB activation and BrdU incorporation. CONCLUSIONS These results suggested that T3 inhibits CREB/CRE signaling pathway and suppresses cytokine expression and VSMCs proliferation, which may account for, at least in part, an anti-atherosclerotic effect of thyroid hormone.
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Affiliation(s)
- Kae Fukuyama
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, 3-1-1 Maidashi, Higashi-ku, 812-8582 Fukuoka, Japan
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Dworet JH, Meinkoth JL. Interference with 3′,5′-Cyclic Adenosine Monophosphate Response Element Binding Protein Stimulates Apoptosis through Aberrant Cell Cycle Progression and Checkpoint Activation. Mol Endocrinol 2006; 20:1112-20. [PMID: 16410315 DOI: 10.1210/me.2005-0386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Abstract
We previously reported that protein kinase A activity is an important determinant of thyroid cell survival. Given the important role of cAMP response element binding protein (CREB) in mediating the transcriptional effects of protein kinase A, we explored whether interference with CREB family members impaired thyroid cell survival. Expression of A-CREB, a dominant-negative CREB mutant that inhibits CREB DNA binding activity, induced apoptosis in rat thyroid cells. A-CREB inhibited CRE-regulated gene expression but failed to alter the expression of bcl-2 family members or of well-characterized inhibitors of apoptosis. To elucidate the mechanism through which impaired CREB function triggered apoptosis, its effects on cell proliferation were examined. Expression of A-CREB inhibited cell number increases, in part due to delayed cell cycle transit. Protracted S-phase progression in A-CREB-expressing cells was sufficient to activate a checkpoint response characterized by Chk-1, histone H2A.X, and p53 phosphorylation. To determine whether cell cycle progression was required for apoptosis, the effects of p27 overexpression were investigated. Overexpression of p27 prevented cell cycle progression, checkpoint activation, and apoptosis in A-CREB-expressing cells. These data reveal a novel mechanism through which interference with CREB abrogates cell survival, through checkpoint activation secondary to cell cycle delay. This study may explain how interference with CREB induces apoptosis in cells where alterations in the expression of pro- and anti-survival genes are not detected.
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Affiliation(s)
- Jessica H Dworet
- Department of Pharmacology, University of Pennsylvania School of Medicine, 420 Curie Boulevard, Philadelphia, Pennsylvania 19104-6061, USA
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Mathieson FA, Nixon GF. Sphingolipids differentially regulate mitogen-activated protein kinases and intracellular Ca2+ in vascular smooth muscle: effects on CREB activation. Br J Pharmacol 2006; 147:351-9. [PMID: 16402047 PMCID: PMC1616991 DOI: 10.1038/sj.bjp.0706600] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
1. Related sphingolipids, sphingosine 1-phosphate (S1P) and sphingosylphosphorylcholine (SPC), have important effects on vascular smooth muscle. The aim of this study was to investigate the intracellular pathways regulated by S1P and SPC in rat cerebral artery. 2. In cerebral arteries, S1P increased extracellular signal-regulated kinase (ERK)1/2 phosphorylation (5.2+/-1.4-fold increase) but did not activate p38 mitogen-activated protein kinase (p38MAPK) as assessed by immunoblotting. In contrast, SPC increased p38MAPK phosphorylation (3.0+/-0.3-fold increase) but did not stimulate ERK1/2. This differential activation was confirmed by measuring activation of heat shock protein (HSP) 27, a known downstream target of p38MAPK. Only SPC, but not S1P, activated HSP27. 3. In enzymatically dispersed cerebral artery myocytes, SPC increased [Ca2+]i in a concentration-dependent manner (peak response at 10 microM: 0.4+/-0.02 ratio units) as determined using the Ca2+ indicator, Fura 2. In contrast to S1P, the SPC-induced [Ca2+]i increase did not involve intracellular release but was due to Ca2+ influx via L-type Ca2+ channels. 4. Despite differences in signalling, both S1P and SPC phosphorylated the transcription factor cAMP response element-binding protein (CREB). S1P-induced CREB activation was dependent on ERK1/2 and Ca2+-calmodulin-dependent protein kinase (CaMK) activation. CREB activation by SPC required both p38MAPK and CaMK activation, but not ERK1/2. 5. In conclusion, S1P and SPC activate distinct MAP kinase isoforms and increase [Ca2+]i via different mechanisms in rat cerebral artery. This does not affect the ability of S1P or SPC to activate CREB, although this occurs via different pathways.
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Affiliation(s)
- Fiona A Mathieson
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD
| | - Graeme F Nixon
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD
- Author for correspondence:
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Morimoto D, Yoshida D, Noha M, Suzuki M, Osamura RY, Teramoto A. Phosphorylation of cAMP response element binding protein (CREB) as a marker of hypoxia in pituitary adenoma. J Neurooncol 2006; 79:143-50. [PMID: 16598418 DOI: 10.1007/s11060-006-9131-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Accepted: 01/31/2006] [Indexed: 12/28/2022]
Abstract
Hypoxia appears to be causatively related to pituitary adenoma. Currently, no biomarkers are available for the postoperative assessment of hypoxia in patient samples. Since the cAMP response element binding protein (CREB) is phosphorylated under hypoxic conditions, we examined whether CREB phosphorylation levels may be exploited as a novel biomarker for hypoxia in pituitary adenoma tissues. HP-75 human pituitary adenoma cells were incubated in 21% or 1% oxygen (normoxia and hypoxia, respectively), and Western blotting was employed to compare the levels of CREB and phosphorylated CREB (p-CREB). Our results show that p-CREB levels are significantly elevated under 1% oxygen, whereas the total CREB concentration remains unchanged. We further tested whether this phosphorylation is applicable as a marker of hypoxia in pituitary adenoma tissues removed by transsphenoidal surgery from 45 patients (32 females and 13 males, 22-78 years old). Fluorescence double immunohistochemistry data revealed that p-CREB in adenoma tissues is significantly elevated, and displays a positive correlation with Knosp grading (Spearman rank correlation; P = 0.0483, r = 0.3412), but no significant association with tumor subtype (Kruskal-Wallis analysis, CREB, P = 0.1072; p-CREB, P = 0.1888; phosphorylation ratio, P = 0.4916). Our findings collectively suggest that CREB phosphorylation may be employed as an in situ marker for hypoxia. Moreover, hypoxia and/or phosphorylation of CREB are associated with the cell invasiveness of pituitary adenomas.
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Affiliation(s)
- Daijiro Morimoto
- Department of Neurosurgery, Nippon Medical School, 113-8603, Tokyo, Japan.
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Nakajima T, Wakasa T, Okuma Y, Inanami O, Nomura Y, Kuwabara M, Kawahara K. Dual inhibition of protein phosphatase-1/2A and calpain rescues nerve growth factor-differentiated PC12 cells from oxygen-glucose deprivation-induced cell death. J Neurosci Res 2006; 83:459-68. [PMID: 16385561 DOI: 10.1002/jnr.20740] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In the present study, we examined how the cell survival signaling via cyclic AMP-responsive element binding protein (CREB) and Akt, and the cell death signaling via cystein proteases, calpain and caspase-3, are involved in oxygen-glucose deprivation (OGD) followed by reoxygenation (OGD/reoxygenation)-induced cell death in nerve growth factor (NGF)-differentiated PC12 cells. OGD/reoxygenation-induced cell death was evaluated by LDH release into the culture medium. The level of LDH release was low (9.0% +/- 4.1%) immediately after 4 hr of OGD (0 hr of reoxygenation), was significantly increased to 28.6% +/- 6.6% at 3 hr of reoxygenation, and remained at similar levels at 6 and 20 hr of reoxygenation, suggesting that reoxygenation at least for 3 hr resulted in the loss of cell membrane integrity. After 4 hr of OGD followed by 3 hr of reoxygenation, dephosphorylation of phosphorylated CREB (pCREB), but not phosphorylated Akt (pAkt), was induced. Under these conditions, calpain- but not caspase-3-mediated alpha-spectrin breakdown product was increased, indicating that OGD/reoxygenation also induced an increase in calpain activity. The restoration of pCREB by protein phosphatase (PP)-1/2A inhibitors or the inhibition of excessive activation of calpain by calpain inhibitor did not reduce OGD/reoxygenation-induced LDH release. Cotreatment with PP-1/2A and calpain inhibitors reduced OGD/reoxygenation-induced LDH release. The present study suggests that a balance in the phosphorylation and proteolytic signaling is involved in the survival of NGF-differentiated PC12 cells.
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Affiliation(s)
- Takayuki Nakajima
- Laboratory of Cellular Cybernetics, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
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Pulver-Kaste RA, Barlow CA, Bond J, Watson A, Penar PL, Tranmer B, Lounsbury KM. Ca2+ source-dependent transcription of CRE-containing genes in vascular smooth muscle. Am J Physiol Heart Circ Physiol 2006; 291:H97-105. [PMID: 16461377 DOI: 10.1152/ajpheart.00753.2005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Altered Ca2+ handling has immediate physiological and long-term genomic effects on vascular smooth muscle function. Previously we showed that Ca2+ entry through voltage-dependent Ca2+ channels (VDCCs) or store-operated Ca2+ channels (SOCCs) results in phosphorylation of the Ca2+/cAMP response element (CRE)-binding protein in cerebral arteries. Here, oligonucleotide array analysis was used to determine gene transcription profiles resulting from these two Ca2+ entry pathways in human cerebrovascular smooth muscle cell cultures. Results were confirmed and expanded using quantitative RT-PCR, Western blot, and immunofluorescence. A distinct, yet overlapping, set of CRE-regulated genes was induced by VDCC activation using K+ membrane depolarization vs. SOCC activation by thapsigargin (TG). Membrane depolarization selectively induced a sustained increase in early growth response-1 (Egr-1) mRNA and protein, which were inhibited by the VDCC blocker nimodipine and the SOCC inhibitor 2-aminoethoxydiphenylborate (2-APB). TG selectively induced a sustained increase in MAPK phosphatase-1 (MKP-1) mRNA and protein, and these effects were decreased by 2-APB, but not by nimodipine. The physiological agonist ANG II also stimulated expression of Egr-1 and MKP-1. Coadministration of 2-APB prevented expression of Egr-1 and MKP-1, whereas nimodipine blocked only Egr-1 expression. TG and ANG II induced phosphorylation of ERK, which was sensitive to 2-APB and was selectively required for CRE-binding protein phosphorylation. Our findings thus indicate that Ca2+ entry through VDCCs and store-operated Ca2+ entry can differentially regulate CRE-containing genes in vascular smooth muscle and also imply that agonist-induced signals involved in modulation of gene transcription can be controlled by multiple sources of Ca2+.
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Affiliation(s)
- Renee A Pulver-Kaste
- Department of Pharmacology, Division of Neurological Surgery, University of Vermont, Burlington, VT 05405, USA
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