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Zhang J, Cai W, Fan Z, Yang C, Wang W, Xiong M, Ma C, Yang J. MicroRNA-24 inhibits the oxidative stress induced by vascular injury by activating the Nrf2/Ho-1 signaling pathway. Atherosclerosis 2019; 290:9-18. [PMID: 31539718 DOI: 10.1016/j.atherosclerosis.2019.08.023] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2019] [Revised: 08/30/2019] [Accepted: 08/30/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS The process of endothelial repair in diabetic patients after stent implantation was significantly delayed compared with that in non-diabetic patients, and oxidative stress is increasingly considered to be relevant to the pathogenesis of diabetic endothelial repair. However, the mechanisms linking diabetes and reendothelialization after vascular injury have not been fully elucidated. The aim of this study was to evaluate the effect of microRNA-24 (miR-24) up-regulation in delayed endothelial repair caused by oxidative stress after balloon injury in diabetic rats. METHODS In vitro, vascular smooth muscle cells (VSMCs) isolated from the thoracic aorta were stimulated with high glucose (HG) after miR-24 recombinant adenovirus (Ad-miR-24-GFP) transfection for 3 days. In vivo, diabetic rats induced using high-fat diet (HFD) and low-dose streptozotocin (30 mg/kg) underwent carotid artery balloon injury followed by Ad-miR-24-GFP transfection for 20 min. RESULTS The expression of miR-24 was decreased in HG-stimulated VSMCs and balloon-injured carotid arteries of diabetic rats, which was accompanied by increased expression of Ogt and Keap1 and decreased expression of Nrf2 and Ho-1. Up-regulation of miR-24 suppressed VSMC oxidative stress induced by HG in vitro, and miR-24 up-regulation promoted reendothelialization in balloon-injured diabetic rats. The underlying mechanism was related to the activation of the Nrf2/Ho-1 signaling pathway, which subsequently suppressed intracellular reactive oxidative species (ROS) production and malondialdehyde (MDA) and NADPH oxidase (Nox) activity, and to the restoration of Sod and Gsh-px activation. CONCLUSIONS The up-regulation of miR-24 significantly promoted endothelial repair after balloon injury through inhibition of oxidative stress by activating the Nrf2/Ho-1 signaling pathway.
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MESH Headings
- Animals
- Blood Glucose/metabolism
- Carotid Artery Injuries/enzymology
- Carotid Artery Injuries/genetics
- Carotid Artery Injuries/pathology
- Cell Proliferation
- Cells, Cultured
- Diabetes Mellitus, Experimental/enzymology
- Diabetes Mellitus, Experimental/genetics
- Diabetes Mellitus, Experimental/pathology
- Heme Oxygenase (Decyclizing)/metabolism
- Kelch-Like ECH-Associated Protein 1/genetics
- Kelch-Like ECH-Associated Protein 1/metabolism
- Male
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/enzymology
- Myocytes, Smooth Muscle/pathology
- N-Acetylglucosaminyltransferases/genetics
- N-Acetylglucosaminyltransferases/metabolism
- NF-E2-Related Factor 2/metabolism
- Oxidative Stress
- Rats, Sprague-Dawley
- Re-Epithelialization
- Signal Transduction
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Affiliation(s)
- Jing Zhang
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Wanyin Cai
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Zhixing Fan
- Department of Cardiology, 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
| | - Chaojun Yang
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Wei Wang
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Mengting Xiong
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Cong Ma
- Central Laboratory, The First College of Clinical Medical Science, China Three Gorges University & Yichang Central People's Hospital, Yichang, 443003, China; Department of Cardiology, 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
| | - Jian Yang
- Department of Cardiology, 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.
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Lian C, Lou H, Zhang J, Tian H, Ou Q, Xu JY, Jin C, Gao F, Zhang J, Wang J, Li W, Xu G, Lu L, Xu GT. MicroRNA-24 protects retina from degeneration in rats by down-regulating chitinase-3-like protein 1. Exp Eye Res 2019; 188:107791. [PMID: 31491426 DOI: 10.1016/j.exer.2019.107791] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 08/12/2019] [Accepted: 09/02/2019] [Indexed: 12/27/2022]
Abstract
MicroRNAs (miRNAs) have been shown to play critical roles in the pathogenesis and progression of degenerative retinal diseases like age-related macular degeneration (AMD). In this study, we first demonstrated that miR-24 plays an important role in maintaining retinal structure and visual function of rats by targeting chitinase-3-like protein 1 (CHI3L1). In the retinal pigment epithelial (RPE) cells of Royal College of Surgeons (RCS) rats, an animal model of genetic retinal degeneration (RD), miR-24 was found lower and CHI3L1 level was higher in comparison with those in Sprague-Dawley (SD) rats. Other changes in the eyes of RCS rats include activated AKT/mTOR and ERK pathways and abnormal autophagy in the RPE cells. Such roles of miR-24 and CHI3L1 were further confirmed in RCS rats by subretinal injection of agomiR-24, which decreased CHI3L1 level and preserved retinal structure and function. Upstream, NF-κB was identified as the regulator of miR-24 in the RPE cells of these rats. On the other hand, in SD rats, intraocular treatment of antagomiR-24 induced pathological changes similar to those in RCS rats. The results revealed the protective roles for miR-24 to RPE cells and a mechanism for RD in RCS rats was proposed: extracellular stress stimuli first activate the NF-κB signaling pathway, which lowers miR-24 expression so that CHI3L1 increased. CHI3L1 sequentially results in aberrant autophagy and RPE dysfunction by activating AKT/mTOR and ERK pathways. Taken together, although the possibility, that the therapeutic effects in RCS rats are caused by other transcriptional changes regulated by miR-24, cannot be excluded, these findings indicate that miR-24 protects rat retina by targeting CHI3L1. Thus, miR-24 and CHI3L1 might be the targets for developing more effective therapy for degenerative retinal diseases like AMD.
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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: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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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Abstract
Background: MicroRNA-24 (miR-24) plays an important role in heart failure by reducing the efficiency of myocardial excitation-contraction coupling. Prolonged cardiac hypertrophy may lead to heart failure, but little is known about the role of miR-24 in cardiac hypertrophy. This study aimed to preliminarily investigate the function of miR-24 and its mechanisms in cardiac hypertrophy. Methods: Twelve Sprague-Dawley rats with a body weight of 50 ± 5 g were recruited and randomly divided into two groups: a transverse aortic constriction (TAC) group and a sham surgery group. Hypertrophy index was measured and calculated by echocardiography and hematoxylin and eosin staining. TargetScans algorithm-based prediction was used to search for the targets of miR-24, which was subsequently confirmed by a real-time polymerase chain reaction and luciferase assay. Immunofluorescence labeling was used to measure the cell surface area, and 3H-leucine incorporation was used to detect the synthesis of total protein in neonatal rat cardiac myocytes (NRCMs) with the overexpression of miR-24. In addition, flow cytometry was performed to observe the alteration in the cell cycle. Statistical analysis was carried out with GraphPad Prism v5.0 and SPSS 19.0. A two-sided P < 0.05 was considered as the threshold for significance. Results: The expression of miR-24 was abnormally increased in TAC rat cardiac tissue (t = −2.938, P < 0.05). TargetScans algorithm-based prediction demonstrated that CDKN1B (p27, Kip1), a cell cycle regulator, was a putative target of miR-24, and was confirmed by luciferase assay. The expression of p27 was decreased in TAC rat cardiac tissue (t = 2.896, P < 0.05). The overexpression of miR-24 in NRCMs led to the decreased expression of p27 (t = 4.400, P < 0.01), and decreased G0/G1 arrest in cell cycle and cardiomyocyte hypertrophy. Conclusion: MiR-24 promotes cardiac hypertrophy partly by affecting the cell cycle through down-regulation of p27 expression.
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Affiliation(s)
- Juan Gao
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital; Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health; Key Laboratory of Molecular Cardiovascular Science, Ministry of Education; Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing 100191, China
| | - Min Zhu
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital; Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health; Key Laboratory of Molecular Cardiovascular Science, Ministry of Education; Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing 100191, China
| | - Rui-Feng Liu
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital; Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health; Key Laboratory of Molecular Cardiovascular Science, Ministry of Education; Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing 100191, China
| | - Jian-Shu Zhang
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital; Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health; Key Laboratory of Molecular Cardiovascular Science, Ministry of Education; Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing 100191, China
| | - Ming Xu
- Department of Cardiology and Institute of Vascular Medicine, Peking University Third Hospital; Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health; Key Laboratory of Molecular Cardiovascular Science, Ministry of Education; Beijing Key Laboratory of Cardiovascular Receptors Research, Beijing 100191, China
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Yang J, Zeng P, Yang J, Liu X, Ding J, Wang H, Chen L. MicroRNA-24 regulates vascular remodeling via inhibiting PDGF-BB pathway in diabetic rat model. Gene 2018; 659:67-76. [PMID: 29559348 DOI: 10.1016/j.gene.2018.03.056] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/11/2018] [Accepted: 03/16/2018] [Indexed: 12/26/2022]
Abstract
PURPOSE Hyperglycemia is the high risk factor of vascular remodeling induced by angioplasty, and neointimal hyperplasia is strongly implicated in the pathogenesis of vascular remodeling caused by carotid artery balloon injury. Studies have shown that MicroRNA 24 (miR-24) plays an important role in angiocardiopathy, However, the role of miR-24 is far from thorough research. In this study, we investigate whether up-regulation of miR-24 by using miR-24 recombinant adenovirus (Ad-miR-24-GFP) can inhibit PDGF-BB signaling pathway and attenuate vascular remodeling in the diabetic rat model. METHODS Male Sprague-Dawley rats (n = 60) were randomly divided into 5 groups and fed with high sugar and high fat diet (Sham, Saline, Scramble, Ad-miR-24 groups), or ordinary diet (Control group). The front four groups were treated with streptozotocin (STZ) four weeks later and the blood glucose level was closely monitored. After the successful establishment of diabetic rats, the external carotid artery was injured by pressuring balloon 1.5 after internal carotid artery ligation, then the blood vessels were harvested 14 days later and indexes were detected including the following: HE staining for the level of vascular intima thickness, immunohistochemical detection for PCNA and P27 to test the proliferative degree of vascular smooth muscle cells (VSMCs), qRT-PCR for the level of miR-24, RAS,PDGF-R, western blot for the protein levels of JNK1/2, p- JNK1/2, ERK1/2, p-ERK1/2, RAS, PDGF-R, AP-1,P27 and PCNA. Serological detection was conducted for TNF-α, IL-6, IL-8. RESULTS The delivery of Ad-miR-24 into balloon injury site has significantly increased the level of miR-24. Up-regulation of miR-24 could regulate vascular remodeling effectively, lower the level of inflammatory factors, inhibit the expression of mRNA and protein levels of JNK1/2, ERK1/2, RAS, PDGF-R, AP-1, P27, PCNA. CONCLUSION miR-24 can inhibit the expression of AP-1 via the inhibition of PDGF-BB signaling pathway, thus inhibit VSMCs proliferation and vascular remodeling.
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Affiliation(s)
- Jian Yang
- Department of Cardiology, The First College of Clinical Medical Sciences, China Three Gorges University, Yichang, China; Key Laboratory of Ischemic Cardiovascular and Cerebrovascular Disease Translational Medicine, Three Gorges University, China.
| | - Ping Zeng
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, China
| | - Jun Yang
- Department of Cardiology, The First College of Clinical Medical Sciences, China Three Gorges University, Yichang, China; Key Laboratory of Ischemic Cardiovascular and Cerebrovascular Disease Translational Medicine, Three Gorges University, China
| | - Xiaowen Liu
- Department of Cardiology, The First College of Clinical Medical Sciences, China Three Gorges University, Yichang, China; Key Laboratory of Ischemic Cardiovascular and Cerebrovascular Disease Translational Medicine, Three Gorges University, China
| | - Jiawang Ding
- Department of Cardiology, The First College of Clinical Medical Sciences, China Three Gorges University, Yichang, China; Key Laboratory of Ischemic Cardiovascular and Cerebrovascular Disease Translational Medicine, Three Gorges University, China
| | - Huibo Wang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang, China
| | - Lihua Chen
- Department of Optometry and Ophthalmology, Yichang Central People's Hospital, Yichang, China
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Jin M, Wu Y, Wang J, Chen J, Huang Y, Rao J, Feng C. MicroRNA-24 promotes 3T3-L1 adipocyte differentiation by directly targeting the MAPK7 signaling. Biochem Biophys Res Commun 2016; 474:76-82. [PMID: 27103442 DOI: 10.1016/j.bbrc.2016.04.073] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 04/15/2016] [Indexed: 01/14/2023]
Abstract
Over the past years, MicroRNAs (miRNAs) act as a vital role in harmony with gene regulation and maintaining cellular homeostasis. It is well testified that miRNAshave been involved in numerous physiological and pathological processes, including embryogenesis, cell fate decision, and cellular differentiation. Adipogenesis is an organized process of cellular differentiation by which pre-adipocytes differentiate towards mature adipocytes, and it is tightly modulated by a series of transcription factors such as peroxisome proliferator-activated receptor γ (PPAR-γ) and sterol regulatory-element binding proteins 1 (SREBP1). However, the molecular mechanisms underlying the connection between miRNAs and adipogenesis-related transcription factors remain obscure. In this study, we unveiled that miR- 24 was remarkably upregulated during 3T3-L1 adipogenesis. Overexpression of miR-24 significantly promoted 3T3-L1 adipogenesis, as evidenced by its ability to increase the expression of PPAR-γ and SREBP1, lipid droplet formation and triglyceride (TG) accumulation. Furthermore, we found that neither ectopic expression of miR-24nor miR-24 inhibitor affect cell proliferation and cell cycle progression. Finally, we demonstrated that miR-24 plays the modulational role by directly repressing MAPK7, a key number in the MAPK signaling pathway. These data indicate that miR-24 is a novel positive regulator of adipocyte differentiation by targeting MAPK7, which provides new insights into the molecular mechanism of miRNA-mediated cellular differentiation.
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Affiliation(s)
- Min Jin
- Division of Reproductive Medicine & Infertility, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88#, Jiefang Rd., Hangzhou, Zhejiang, 310009, China.
| | - Yutao Wu
- School of Medicine, Zhejiang University, 288# Yuhangtang Rd, Hangzhou, Zhejiang, 310003, China
| | - Jing Wang
- School of Medicine, Zhejiang University, 288# Yuhangtang Rd, Hangzhou, Zhejiang, 310003, China
| | - Jian Chen
- Division of Reproductive Medicine & Infertility, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88#, Jiefang Rd., Hangzhou, Zhejiang, 310009, China
| | - Yiting Huang
- Division of Reproductive Medicine & Infertility, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88#, Jiefang Rd., Hangzhou, Zhejiang, 310009, China
| | - Jinpeng Rao
- Division of Reproductive Medicine & Infertility, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88#, Jiefang Rd., Hangzhou, Zhejiang, 310009, China
| | - Chun Feng
- Division of Reproductive Medicine & Infertility, The Second Affiliated Hospital, School of Medicine, Zhejiang University, 88#, Jiefang Rd., Hangzhou, Zhejiang, 310009, China
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Yang J, Chen L, Ding J, Fan Z, Li S, Wu H, Zhang J, Yang C, Wang H, Zeng P, Yang J. MicroRNA-24 inhibits high glucose-induced vascular smooth muscle cell proliferation and migration by targeting HMGB1. Gene 2016; 586:268-73. [PMID: 27085480 DOI: 10.1016/j.gene.2016.04.027] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Revised: 04/05/2016] [Accepted: 04/07/2016] [Indexed: 12/21/2022]
Abstract
Dysfunction of vascular smooth muscle cells (VSMCs) performs a key role in the pathogenesis of diabetic vascular disease. Recent studies have reported that microRNA-24 (miR-24) may be implicated in diabetes and atherosclerotic vascular diseases. This study was designed to explore the role of miR-24 on VSMC proliferation and migration under high glucose conditions mimicking diabetes, and reveal the underlying mechanism. VSMCs were isolated from rat thoracic aortas, treated with normal glucose (NG, 5.5mM) or high glucose (HG, 30mM) during an incubation period. Cell viability, proliferation and migration were detected by trypan blue staining, BrdU incorporation assay and transwell chamber assay. Gene and protein expression were analyzed by qRT-PCR and Western blot respectively. We also used electrophoretic mobility shift assay (EMSA) to detect nuclear factor kappaB (NF-κB) DNA binding. TNF-α and IL-6 levels were determined by enzyme-linked immunosorbent assay. The results showed that adenovirus-mediated miR-24 overexpression significantly inhibited HG-stimulated VSMC proliferation and migration. Meanwhile, high mobility group box-1 (HMGB1) as a target of miR-24, was also markedly suppressed after miR-24 transfection. Additionally, NF-κB nuclear translocation and DNA binding, TNF-α and IL-6 production were all decreased associated with the down-regulation of HMGB1. The above data indicated that miR-24 is a crucial regulator of high glucose-induced proliferation and migration in VSMCs, and suggests that elevation of miR-24 in vascular system may be a novel therapeutic strategy to prevent the development of diabetic atherosclerosis.
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Affiliation(s)
- Jian Yang
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Lihua Chen
- Department of Optometry and Ophthalmology, Yichang Central People's Hospital, Yichang 443000, Hubei Province, China
| | - Jiawang Ding
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Zhixing Fan
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Song Li
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Hui Wu
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Jing Zhang
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Chaojun Yang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Huibo Wang
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Ping Zeng
- Institute of Cardiovascular Diseases, China Three Gorges University, Yichang 443000, Hubei Province, China
| | - Jun Yang
- Department of Cardiology, the First College of Clinical Medical Sciences, China Three Gorges University, Yichang 443000, Hubei Province, China.
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Liu YX, Ma Y, Long XD. Progress in research of microRNA-24. Shijie Huaren Xiaohua Zazhi 2014; 22:5106-5113. [DOI: 10.11569/wcjd.v22.i33.5106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
MicroRNAs are endogenous, small, and noncoding RNAs of 18-24 nucleotides in length that regulate tissue/organ development, cell growth, differentiation, and apoptosis and play an essential role in the development and progression of tumors. This paper will discuss the biological characteristics of microRNA-24 and its biological role in tumors and non-tumor diseases, with an aim to provide new clues to disease diagnosis and treatment to reduce the mortality of patients.
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