1
|
Exploring the Role of Obesity in Dilated Cardiomyopathy Based on Bio-informatics Analysis. J Cardiovasc Dev Dis 2022; 9:jcdd9120462. [PMID: 36547458 PMCID: PMC9783214 DOI: 10.3390/jcdd9120462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/08/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
(1) Background: Obesity is a major risk factor for cardiovascular disease (CVD), contributing to increasing global disease burdens. Apart from heart failure, coronary artery disease, and arrhythmia, recent research has found that obesity also elevates the risk of dilated cardiomyopathy (DCM). The main purpose of this study was to investigate the underlying biological role of obesity in increasing the risk of DCM. (2) Methods: The datasets GSE120895, GSE19303, and GSE2508 were downloaded from the Gene Expression Omnibus (GEO) database. Differentially expressed genes (DEGs) were analyzed using GSE120895 for DCM and GSE2508 for obesity, and the findings were compiled to discover the common genes. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were conducted for the common genes in RStudio. In addition, CIBERSORT was used to obtain the immune cellular composition from DEGs. The key genes were identified in the set of common genes by the least absolute shrinkage and selection operator (LASSO) algorithm, the prognostic risk models of which were verified by receiver operator characteristic (ROC) curves in GSE19303. Finally, Spearman's correlation was used to explore the connections between key genes and immune cells. (3) Results: GO and KEGG pathway enrichment analyses showed that the main enriched terms of the common genes were transforming growth factor-beta (TGF-β), fibrillar collagen, NADPH oxidase activity, and multiple hormone-related signaling pathways. Both obesity and DCM had a disordered immune environment, especially obesity. The key genes NOX4, CCDC80, COL1A2, HTRA1, and KLHL29 may be primarily responsible for the changes. Spearman's correlation analysis performed for key genes and immune cells indicated that KLHL29 closely correlated to T cells and M2 macrophages, and HTRA1 very tightly correlated to plasma cells. (4) Conclusions: Bio-informatics analyses performed for DCM and obesity in our study suggested that obesity disturbed the immune micro-environment, promoted oxidative stress, and increased myocardial fibrosis, resulting in ventricular remodeling and an increased risk of DCM. The key genes KLHL29 and HTRA1 may play critical roles in obesity-related DCM.
Collapse
|
2
|
Wu X, Fan Z, Chen M, Chen Y, Rong D, Cui Z, Yuan Y, Zhuo L, Xu Y. Forkhead transcription factor FOXO3a mediates interferon-γ-induced MHC II transcription in macrophages. Immunology 2019; 158:304-313. [PMID: 31509237 DOI: 10.1111/imm.13116] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 08/23/2019] [Accepted: 09/03/2019] [Indexed: 12/23/2022] Open
Abstract
Macrophages are professional antigen-presenting cells relying on the expression of class II major histocompatibility complex (MHC II) genes. Interferon-γ (IFN-γ) activates MHC II transcription via the assembly of an enhanceosome centred on class II trans-activator (CIITA). In the present study, we investigated the role of the forkhead transcription factor FOXO3a in IFN- γ-induced MHC II transcription in macrophages. Knockdown of FOXO3a, but not FOXO1 or FOXO4, diminished IFN-γ-induced MHC II expression in RAW cells. On the contrary, over-expression of FOXO3a, but neither FOXO1 nor FOXO4, enhanced CIITA-mediated trans-activation of the MHC II promoter. IFN-γ treatment promoted the recruitment of FOXO3a to the MHC II promoter. Co-immunoprecipitation and RE-ChIP assays showed that FOXO3a was a component of the MHC II enhanceosome forming interactions with CIITA, RFX5, RFXB and RFXAP. FOXO3a contributed to MHC II transcription by altering histone modifications surrounding the MHC II promoter. Of interest, FOXO3a was recruited to the type IV CIITA promoter and directly activated CIITA transcription by interacting with signal transducer of activation and transcription 1 in response to IFN-γ stimulation. In conclusion, our data unveil a novel role for FOXO3a in the regulation of MHC II transcription in macrophages.
Collapse
Affiliation(s)
- Xiaoyan Wu
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Zhiwen Fan
- Department of Pathology, Nanjing Drum Tower Hospital Affiliated with Nanjing University School of Medicine, Nanjing, China
| | - Ming Chen
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Yi Chen
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Danyan Rong
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Zhiwei Cui
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Yibiao Yuan
- The Laboratory Centre for Basic Medical Sciences, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Lili Zhuo
- Department of Geriatrics, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| |
Collapse
|
3
|
Yu L, Yang G, Zhang X, Wang P, Weng X, Yang Y, Li Z, Fang M, Xu Y, Sun A, Ge J. Megakaryocytic Leukemia 1 Bridges Epigenetic Activation of NADPH Oxidase in Macrophages to Cardiac Ischemia-Reperfusion Injury. Circulation 2019; 138:2820-2836. [PMID: 30018168 DOI: 10.1161/circulationaha.118.035377] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
BACKGROUND Excessive accumulation of reactive oxygen species (ROS), catalyzed by the NADPH oxidases (NOX), is involved in the pathogenesis of ischemia-reperfusion (IR) injury. The underlying epigenetic mechanism remains elusive. METHODS We evaluated the potential role of megakaryocytic leukemia 1 (MKL1), as a bridge linking epigenetic activation of NOX to ROS production and cardiac ischemia-reperfusion injury. RESULTS Following IR injury, MKL1-deficient (knockout) mice exhibited smaller myocardial infarction along with improved heart function compared with wild-type littermates. Similarly, pharmaceutical inhibition of MKL1 with CCG-1423 also attenuated myocardial infarction and improved heart function in mice. Amelioration of IR injury as a result of MKL1 deletion or inhibition was accompanied by reduced ROS in vivo and in vitro. In response to IR, MKL1 levels were specifically elevated in macrophages, but not in cardiomyocytes, in the heart. Of note, macrophage-specific deletion (MϕcKO), instead of cardiomyocyte-restricted ablation (CMcKO), of MKL1 in mice led to similar improvements of infarct size, heart function, and myocardial ROS generation. Reporter assay and chromatin immunoprecipitation assay revealed that MKL1 directly bound to the promoters of NOX genes to activate NOX transcription. Mechanistically, MKL1 recruited the histone acetyltransferase MOF (male absent on the first) to modify the chromatin structure surrounding the NOX promoters. Knockdown of MOF in macrophages blocked hypoxia/reoxygenation-induced NOX transactivation and ROS accumulation. Of importance, pharmaceutical inhibition of MOF with MG149 significantly downregulated NOX1/NOX4 expression, dampened ROS production, and normalized myocardial function in mice exposed to IR injury. Finally, administration of a specific NOX1/4 inhibitor GKT137831 dampened ROS generation and rescued heart function after IR in mice. CONCLUSIONS Our data delineate an MKL1-MOF-NOX axis in macrophages that contributes to IR injury, and as such we have provided novel therapeutic targets in the treatment of ischemic heart disease.
Collapse
Affiliation(s)
- Liming Yu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.)
| | - Guang Yang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.)
| | - Xinjian Zhang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.)
| | - Peng Wang
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China.,Institute of Biomedical Sciences (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China
| | - Xinyu Weng
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China.,Institute of Biomedical Sciences (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China
| | - Yuyu Yang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China (Y.Y.)
| | - Zilong Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.).,Institute of Biomedical Research, Liaocheng University, Liaocheng, China (Z.L., Y.X.)
| | - Mingming Fang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.)
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, China (L.Y., G.Y., X.Z., Z.L., M.F., Y.X.).,Institute of Biomedical Research, Liaocheng University, Liaocheng, China (Z.L., Y.X.)
| | - Aijun Sun
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China.,Institute of Biomedical Sciences (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China
| | - Junbo Ge
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China.,Institute of Biomedical Sciences (P.W., X.W., A.S., J.G.), Fudan University, Shanghai, China
| |
Collapse
|
4
|
Shang N, Bhullar KS, Hubbard BP, Wu J. Tripeptide IRW initiates differentiation in osteoblasts via the RUNX2 pathway. Biochim Biophys Acta Gen Subj 2019; 1863:1138-1146. [DOI: 10.1016/j.bbagen.2019.04.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/08/2019] [Accepted: 04/09/2019] [Indexed: 12/14/2022]
|
5
|
Chen B, Li Z, Feng Y, Wu X, Xu Y. Myocardin-related transcription factor A (MRTF-A) mediates doxorubicin-induced PERP transcription in colon cancer cells. Biochem Biophys Res Commun 2018; 503:1732-1739. [DOI: 10.1016/j.bbrc.2018.07.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 07/21/2018] [Indexed: 10/28/2022]
|
6
|
HADC5 deacetylates MKL1 to dampen TNF-α induced pro-inflammatory gene transcription in macrophages. Oncotarget 2017; 8:94235-94246. [PMID: 29212224 PMCID: PMC5706870 DOI: 10.18632/oncotarget.21670] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 09/18/2017] [Indexed: 12/20/2022] Open
Abstract
Macrophage-dependent inflammatory response on the one hand functions as a key line of defense in host immunity but on the other hand underlies the pathogenesis of a host of human pathologies when aberrantly activated. Our previous investigations have led to the identification of megakaryocytic leukemia 1 (MKL1) as a key co-factor of NF-κB/p65 participating in TNF-α induced pro-inflammatory transcription in macrophages. How post-translational modifications contribute to the modulation of MKL1 activity remains an underexplored subject matter. Here we report that the lysine deacetylase HDAC5 interacts with and deacetylates MKL1 in cells. TNF-α treatment down-regulates HDAC5 expression and expels HDAC5 from the promoters of pro-inflammatory genes in macrophages. In contrast, over-expression of HDAC5 attenuates TNF-α induced pro-inflammatory transcription. Mechanistically, HDAC5-mediated MKL1 deacetylation disrupts the interaction between MKL1 and p65. In addition, deacetylation of MKL1 by HDAC5 blocks its nuclear translocation in response to TNF-α treatment. In conclusion, our work has identified an important pathway that contributes to the regulation of pro-inflammatory response in macrophages.
Collapse
|
7
|
Fan Z, Li Z, Yang Y, Liu S, Guo J, Xu Y. HIF-1α coordinates epigenetic activation of SIAH1 in hepatocytes in response to nutritional stress. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2017; 1860:1037-1046. [DOI: 10.1016/j.bbagrm.2017.08.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 07/19/2017] [Accepted: 08/10/2017] [Indexed: 12/20/2022]
|
8
|
Yu L, Li Z, Fang M, Xu Y. Acetylation of MKL1 by PCAF regulates pro-inflammatory transcription. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2017; 1860:839-847. [PMID: 28571745 DOI: 10.1016/j.bbagrm.2017.05.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 05/08/2017] [Accepted: 05/28/2017] [Indexed: 01/14/2023]
Abstract
Inflammation is considered a fundamental host defense mechanism and, when aberrantly activated, contributes to a host of human diseases. Previously we have reported that the transcriptional regulator megakaryocytic leukemia 1 (MKL1) plays a role programming cellular inflammatory response by modulating NF-κB activity. Here we report that MKL1 was acetylated in vivo and pro-inflammatory stimuli (TNF-α and LPS) augmented MKL1 acetylation accompanying increased MKL1 binding to NF-κB target promoters. Further analysis revealed that the lysine acetyltransferase PCAF mediated MKL1 acetylation: TNF-α and LPS promoted the interaction between MKL1 and PCAF whereas depletion of PCAF abrogated the induction of MKL1 acetylation by TNF-α and LPS. Acetylation of MKL1 was necessary for MKL1 to activate the transcription of pro-inflammatory genes because mutation of four conserved lysine residues in MKL1 attenuated its capacity as a trans-activator of NF-κB target genes. Mechanistically, MKL1 acetylation served to promote MKL1 nuclear enrichment, to enhance the MKL1-NF-κB interaction, and to stabilize the binding of MKL1 on target promoters. In conclusion, our data unveil an important pathway that contributes to the transcriptional regulation of inflammatory response.
Collapse
Affiliation(s)
- Liming Yu
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | - Zilong Li
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Department of Nursing, Jiangsu Jiankang Vocational College, Nanjing, China
| | - Yong Xu
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China.
| |
Collapse
|
9
|
Xu W, Xu H, Fang M, Wu X, Xu Y. MKL1 links epigenetic activation of MMP2 to ovarian cancer cell migration and invasion. Biochem Biophys Res Commun 2017; 487:500-508. [PMID: 28385531 DOI: 10.1016/j.bbrc.2017.04.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 04/02/2017] [Indexed: 11/15/2022]
Abstract
Responding to pro-metastatic cues such as low oxygen tension, cancer cells develop several different strategies to facilitate migration and invasion. During this process, expression levels of matrix metalloproteinases (MMPs) are up-regulated so that cancer cells can more easily enter or exit the circulation. In this report we show that message levels of the transcriptional modulator MKL1 were elevated in malignant forms of ovarian cancer tissues in humans when compared to more benign forms accompanying a similar change in MMP2 expression. MKL1 silencing blocked hypoxia-induced migration and invasion of ovarian cancer cells (SKOV-3) in vitro. Over-expression of MKL1 activated while MKL1 depletion repressed MMP2 transcription in SKOV-3 cells. MKL1 was recruited to the MMP2 promoter by NF-κB in response to hypoxia. Mechanistically, MKL1 recruited a histone methyltransferase, SET1, and a chromatin remodeling protein, BRG1, and coordinated their interaction to alter the chromatin structure surrounding the MMP2 promoter leading to transcriptional activation. Both BRG1 and SET1 were essential for hypoxia-induced MMP2 trans-activation. Finally, expression levels of SET1 and BRG1 were positively correlated with ovarian cancer malignancies in humans. Together, our data suggest that MKL1 promotes ovarian cancer cell migration and invasion by epigenetically activating MMP2 transcription.
Collapse
Affiliation(s)
- Wenping Xu
- Department of Pathophysiology, Jiangsu Jiankang Vocational College, Nanjing, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Department of Nursing, Jiangsu Jiankang Vocational College, Nanjing, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| |
Collapse
|
10
|
Yang G, Weng X, Zhao Y, Zhang X, Hu Y, Dai X, Liang P, Wang P, Ma L, Sun X, Hou L, Xu H, Fang M, Li Y, Jenuwein T, Xu Y, Sun A. The histone H3K9 methyltransferase SUV39H links SIRT1 repression to myocardial infarction. Nat Commun 2017; 8:14941. [PMID: 28361889 PMCID: PMC5381011 DOI: 10.1038/ncomms14941] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 02/15/2017] [Indexed: 12/27/2022] Open
Abstract
Myocardial infarction (MI) dampens heart function and poses a great health risk. The class III deacetylase sirtuin 1 (SIRT1) is known to confer cardioprotection. SIRT1 expression is downregulated in the heart by a number of stress stimuli that collectively drive the pathogenesis of MI, although the underlying mechanism remains largely obscure. Here we show that in primary rat neonatal ventricular myocytes (NRVMs), ischaemic or oxidative stress leads to a rapid upregulation of SUV39H, the mammalian histone H3K9 methyltransferase, paralleling SIRT1 downregulation. Compared to wild-type littermates, SUV39H knockout mice are protected from MI. Likewise, suppression of SUV39H activity with chaetocin attenuates cardiac injury following MI. Mechanistically, SUV39H cooperates with heterochromatin protein 1 gamma (HP1γ) to catalyse H3K9 trimethylation on the SIRT1 promoter and represses SIRT1 transcription. SUV39H augments intracellular ROS levels in a SIRT1-dependent manner. Our data identify a previously unrecognized role for SUV39H linking SIRT1 trans-repression to myocardial infarction. The molecular pathways regulating the cardioprotective activity of deacetylase sirtuin-1 are unknown. Here, Yang et al. show that histone H3K9 methyltransferase SUV39H and HP1gamma cooperatively methylate H3K9 on the sirtuin-1 promoter and inhibit sirtuin-1 transcription, and show that inhibition of SUV39H in mice is cardioprotective.
Collapse
Affiliation(s)
- Guang Yang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Xinyu Weng
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China.,Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital, Fudan University, Shanghai 200032, China.,Institute of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Yuhao Zhao
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Xinjian Zhang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Yuanping Hu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Xin Dai
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Peng Liang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Peng Wang
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - LeiLei Ma
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Xiaolei Sun
- Institute of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Lei Hou
- Institute of Biomedical Sciences, Fudan University, Shanghai 200032, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Mingming Fang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China.,Department of Nursing, Jiangsu Jiankang Vocational College, Nanjing 210029, china
| | - Yuehua Li
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Thomas Jenuwein
- Department of Epigenetics, Max Planck Institute of Immunobiology and Epigenetics, Stübeweg 51, 79108 Freiburg, Germany
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention and Key Laboratory of Human Functional Genomics of Jiangsu Province, Department of Pathophysiology, Nanjing Medical University, Nanjing 211166, China
| | - Aijun Sun
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital, Fudan University, Shanghai 200032, China.,Institute of Biomedical Sciences, Fudan University, Shanghai 200032, China
| |
Collapse
|
11
|
Yang G, Zhang X, Weng X, Liang P, Dai X, Zeng S, Xu H, Huan H, Fang M, Li Y, Xu D, Xu Y. SUV39H1 mediated SIRT1 trans-repression contributes to cardiac ischemia-reperfusion injury. Basic Res Cardiol 2017; 112:22. [PMID: 28271186 DOI: 10.1007/s00395-017-0608-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 02/23/2017] [Indexed: 02/04/2023]
Abstract
Ischemic reperfusion (I/R) contributes to deleterious cardiac remodeling and heart failure. The deacetylase SIRT1 has been shown to protect the heart from I/R injury. We examined the mechanism whereby I/R injury represses SIRT1 transcription in the myocardium. There was accumulation of trimethylated histone H3K9 on the proximal SIRT1 promoter in the myocardium in mice following I/R injury and in cultured cardiomyocytes exposed to hypoxia-reoxygenation (H/R). In accordance, the H3K9 trimethyltransferase SUV39H1 bound to the SIRT1 promoter and repressed SIRT1 transcription. SUV39H1 expression was up-regulated in the myocardium in mice following I/R insults and in H/R-treated cardiomyocytes paralleling SIRT1 down-regulation. Silencing SUV39H1 expression or suppression of SUV39H1 activity erased H3K9Me3 from the SIRT1 promoter and normalized SIRT1 levels in cardiomyocytes. Meanwhile, SUV39H1 deficiency or inhibition attenuated I/R-induced infarction and improved heart function in mice likely through influencing ROS levels in a SIRT1-dependent manner. Therefore, our data uncover a novel mechanism for SIRT1 trans-repression during cardiac I/R injury and present SUV39H1 as a druggable target for the development of therapeutic strategies against ischemic heart disease.
Collapse
Affiliation(s)
- Guang Yang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Xinjian Zhang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Xinyu Weng
- Shanghai Institute of Cardiovascular Disease, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
| | - Peng Liang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Xin Dai
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Sheng Zeng
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Hailin Huan
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Mingming Fang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Yuehua Li
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China
| | - Dachun Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China. .,Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, 301 Yanchang Middle Rd, Shanghai, 200072, China.
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing, 210029, Jiangsu, China.
| |
Collapse
|
12
|
Sun J, Wang Y, Cui W, Lou Y, Sun G, Zhang D, Miao L. Role of Epigenetic Histone Modifications in Diabetic Kidney Disease Involving Renal Fibrosis. J Diabetes Res 2017; 2017:7242384. [PMID: 28695133 PMCID: PMC5485509 DOI: 10.1155/2017/7242384] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 03/14/2017] [Indexed: 12/18/2022] Open
Abstract
One of the commonest causes of end-stage renal disease is diabetic kidney disease (DKD). Renal fibrosis, characterized by the accumulation of extracellular matrix (ECM) proteins in glomerular basement membranes and the tubulointerstitium, is the final manifestation of DKD. The TGF-β pathway triggers epithelial-to-mesenchymal transition (EMT), which plays a key role in the accumulation of ECM proteins in DKD. DCCT/EDIC studies have shown that DKD often persists and progresses despite glycemic control in diabetes once DKD sets in due to prior exposure to hyperglycemia called "metabolic memory." These imply that epigenetic factors modulate kidney gene expression. There is evidence to suggest that in diabetes and hyperglycemia, epigenetic histone modifications have a significant effect in modulating renal fibrotic and ECM gene expression induced by TGF-β1, as well as its downstream profibrotic genes. Histone modifications are also implicated in renal fibrosis through its ability to regulate the EMT process triggered by TGF-β signaling. In view of this, efforts are being made to develop HAT, HDAC, and HMT inhibitors to delay, stop, or even reverse DKD. In this review, we outline the latest advances that are being made to regulate histone modifications involved in DKD.
Collapse
Affiliation(s)
- Jing Sun
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Yangwei Wang
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Wenpeng Cui
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Yan Lou
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Guangdong Sun
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Dongmei Zhang
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
| | - Lining Miao
- Department of Nephrology, Second Hospital of Jilin University, Changchun 130041, China
- *Lining Miao:
| |
Collapse
|
13
|
Zeng S, Yang Y, Cheng X, Zhou B, Li P, Zhao Y, Kong X, Xu Y. HIC1 epigenetically represses CIITA transcription in B lymphocytes. BIOCHIMICA ET BIOPHYSICA ACTA 2016; 1859:1481-1489. [PMID: 27720955 DOI: 10.1016/j.bbagrm.2016.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 10/05/2016] [Accepted: 10/05/2016] [Indexed: 02/06/2023]
Abstract
Differentiation of B lymphocytes into isotope-specific plasma cells represents a hallmark event in adaptive immunity. During B cell maturation, expression of the class II transactivator (CIITA) gene is down-regulated although the underlying epigenetic mechanism is not completely defined. Here we report that hypermethylated in cancer 1 (HIC1) was up-regulated in differentiating B lymphocytes paralleling CIITA repression. Over-expression of HIC1 directly repressed endogenous CIITA transcription in B cells. Reporter assay and chromatin immunoprecipitation (ChIP) assay confirmed that HIC1 bound to the proximal CIITA type III promoter (-545/-113); mutation of a conserved HIC1 site within this region abrogated CIITA trans-repression. More important, depletion of HIC1 with small interfering RNA (siRNA) restored CIITA expression in differentiating B cells. Mechanistically, HIC1 preferentially interacted with and recruited DNMT1 and DNMT3b to the CIITA promoter to synergistically repress CIITA transcription. On the contrary, silencing of DNMT1/DNMT3b or inhibition of DNMT activity with 5-aza-dC attenuated CIITA trans-repression. Therefore, our data identify HIC1 as a novel factor involved in B cell differentiation acting as an epigenetic repressor of CIITA transcription.
Collapse
Affiliation(s)
- Sheng Zeng
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | - Yuyu Yang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Xian Cheng
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China; Jiangsu Institute of Nuclear Medicine, Wuxi, China
| | - Bisheng Zhou
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | - Ping Li
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China; Department of Gastroenterology, Second Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Yuhao Zhao
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | - Xiaocen Kong
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China; Department of Endocrinology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.
| | - Yong Xu
- Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China.
| |
Collapse
|
14
|
Fang M, Fan Z, Tian W, Zhao Y, Li P, Xu H, Zhou B, Zhang L, Wu X, Xu Y. HDAC4 mediates IFN-γ induced disruption of energy expenditure-related gene expression by repressing SIRT1 transcription in skeletal muscle cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1859:294-305. [PMID: 26619800 DOI: 10.1016/j.bbagrm.2015.11.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 11/13/2015] [Accepted: 11/23/2015] [Indexed: 01/08/2023]
Abstract
Metabolic homeostasis is achieved through balanced energy storage and output. Impairment of energy expenditure is a hallmark event in patients with obesity and type 2 diabetes. Previously we have shown that the pro-inflammatory cytokine interferon gamma (IFN-γ) disrupts energy expenditure in skeletal muscle cells via hypermethylated in cancer 1 (HIC1)-class II transactivator (CIITA) dependent repression of SIRT1 transcription. Here we report that repression of SIRT1 transcription by IFN-γ paralleled loss of histone acetylation on the SIRT1 promoter region with simultaneous recruitment of histone deacetylase 4 (HDAC4). IFN-γ activated HDAC4 in vitro and in vivo by up-regulating its expression and stimulating its nuclear accumulation. HIC1 and CIITA recruited HDAC4 to the SIRT1 promoter and cooperated with HDAC4 to repress SIRT1 transcription. HDAC4 depletion by small interfering RNA or pharmaceutical inhibition normalized histone acetylation on the SIRT1 promoter and restored SIRT1 expression in the presence of IFN-γ. Over-expression of HDAC4 suppressed the transcription of genes involved in energy expenditure in a SIRT1-dependent manner. In contrast, HDAC4 knockdown/inhibition neutralized the effect of IFN-γ on cellular metabolism by normalizing SIRT1 expression. Therefore, our data reveal a role for HDAC4 in regulating cellular energy output and as such provide insights into rationalized design of novel anti-diabetic therapeutics.
Collapse
Affiliation(s)
- Mingming Fang
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; Department of Nursing, Jiangsu Jiankang Vocational University, Nanjing, China
| | - Zhiwen Fan
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Wenfang Tian
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yuhao Zhao
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Ping Li
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Bisheng Zhou
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Liping Zhang
- Department of Biochemistry, Xinjiang Medical University, Urumqi, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| |
Collapse
|
15
|
Fang M, Li P, Wu X, Xu Y. Class II transactivator (CIITA) mediates transcriptional repression of pdk4 gene by interacting with hypermethylated in cancer 1 (HIC1). J Biomed Res 2015; 29:308-15. [PMID: 26243517 PMCID: PMC4547379 DOI: 10.7555/jbr.29.20150055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/09/2015] [Indexed: 12/30/2022] Open
Abstract
Increased accumulation and/or impaired utilization of fatty acid in extra-adipose tissues are implicated in the pathogenesis of insulin resistance and type 2 diabetes. Pyruvate dehydrogenase kinase 4 (Pdk4) is a key enzyme involved in fatty oxidation and energy expenditure, and its expression can be repressed by pro-inflammatory stimuli. Previously, we have shown that class II transactivator (CIITA) mediates the adverse effect of interferon gamma (IFN-γ) in skeletal muscle cells by cooperating with hypermethylated in cancer 1 (HIC1) to repress silent information regulator 1 (SIRT1) transcription. Building upon this finding, we report here that CIITA interacted with HIC1 via the GTP-binding domain (GBD) while HIC1 interacted with CIITA via the BTB/POZ domain. The GBD domain was required for CIITA to repress SIRT1 transcription probably acting as a bridge for CIITA to bind to HIC1 and consequently to bind to the SIRT1 promoter. IFN-γ stimulation, CIITA over-expression, or HIC1 over-expression repressed Pdk4 promoter activity while silencing either CIITA or HIC1 normalized Pdk4 expression in the presence of IFN-γ. An increase in SIRT1 expression or activity partially rescued Pdk4 expression in the presence of CIITA, but SIRT1 inhibition abrogated Pdk4 normalization even in the absence of CIITA. Taken together, our data have identified a HIC1-CIITA-SIRT1 axis that regulates Pdk4 transcription in response to IFN-γ stimulation.
Collapse
Affiliation(s)
- Mingming Fang
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology.,Department of Nursing, Jiangsu Jiankang Vocational University, Nanjing, Jiangsu 210029, China
| | - Ping Li
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology.,Department of Gastroenterology, Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210011, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology.,Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China.
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology.,Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China.
| |
Collapse
|
16
|
Xia J, Fang M, Wu X, Yang Y, Yu L, Xu H, Kong H, Tan Q, Wang H, Xie W, Xu Y. A2b adenosine signaling represses CIITA transcription via an epigenetic mechanism in vascular smooth muscle cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1849:665-76. [PMID: 25765819 DOI: 10.1016/j.bbagrm.2015.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 02/05/2015] [Accepted: 03/03/2015] [Indexed: 01/08/2023]
Abstract
Chronic inflammation plays a major role in the pathogenesis of atherosclerosis. Vascular smooth muscle cells (VSMC), by expressing and presenting major histocompatibility complex II (MHC II) molecules, help recruit T lymphocyte and initiate the inflammatory response within the vasculature. We have previously shown that VSMCs isolated from mice with deficient adenosine A2b receptor (A2b-null) exhibit higher expression of class II transactivator (CIITA), the master regulator of MHC II transcription, compared to wild type littermates. Here we report that activation of A2b adenosine signaling suppresses CIITA expression in human aortic smooth muscle cells. Down-regulation of CIITA expression was largely attributable to transcriptional repression of type III and IV promoters. Chromatin immunoprecipitation (ChIP) analyses revealed that A2b signaling repressed CIITA transcription by attenuating specific histone modifications on the CIITA promoters in a STAT1-dependent manner. STAT1 interacted with PCAF/GCN5, histone H3K9 acetyltransferases, and WDR5, a key component of the mammalian H3K4 methyltransferase complex, to activate CIITA transcription. A2b signaling prevented recruitment of PCAF/GCN5 and WDR5 to the CIITA promoters in a STAT1-dependent manner. In conclusion, our data suggest that adenosine A2b signaling represses CIITA transcription in VSMCs by manipulating the interaction between STAT1 and the epigenetic machinery.
Collapse
Affiliation(s)
- Jun Xia
- Department of Respiratory Medicine, the First Affiliated Hospital of Nanjing Medical University, China; Department of Respiratory Medicine, Jiangsu Province Hospital of Traditional Chinese Medicine, China
| | - Mingming Fang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China; Department of Nursing, Jiangsu Jiankang Vocational University, Nanjing, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China
| | - Yuyu Yang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China; State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China
| | - Liming Yu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China
| | - Hui Kong
- Department of Respiratory Medicine, the First Affiliated Hospital of Nanjing Medical University, China
| | - Qi Tan
- Department of Respiratory Medicine, the First Affiliated Hospital of Nanjing Medical University, China
| | - Hong Wang
- Department of Respiratory Medicine, the First Affiliated Hospital of Nanjing Medical University, China.
| | - Weiping Xie
- Department of Respiratory Medicine, the First Affiliated Hospital of Nanjing Medical University, China.
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, China.
| |
Collapse
|
17
|
Weng X, Yu L, Liang P, Chen D, Cheng X, Yang Y, Li L, Zhang T, Zhou B, Wu X, Xu H, Fang M, Gao Y, Chen Q, Xu Y. Endothelial MRTF-A mediates angiotensin II induced cardiac hypertrophy. J Mol Cell Cardiol 2015; 80:23-33. [DOI: 10.1016/j.yjmcc.2014.11.009] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 11/06/2014] [Indexed: 11/25/2022]
|
18
|
Weng X, Yu L, Liang P, Li L, Dai X, Zhou B, Wu X, Xu H, Fang M, Chen Q, Xu Y. A crosstalk between chromatin remodeling and histone H3K4 methyltransferase complexes in endothelial cells regulates angiotensin II-induced cardiac hypertrophy. J Mol Cell Cardiol 2015; 82:48-58. [PMID: 25712920 DOI: 10.1016/j.yjmcc.2015.02.010] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/29/2015] [Accepted: 02/10/2015] [Indexed: 02/08/2023]
Abstract
Angiotensin II (Ang II) induces cardiac hypertrophy and fibrosis in part by stimulating endothelin (ET-1) transcription. The involvement of the epigenetic machinery in this process is largely undefined. In the present study, we examined the epigenetic maneuvering underlying cardiac hypertrophy and fibrosis following ET-1 transactivation by Ang II. In response to Ang II stimulation, core components of the mammalian chromatin remodeling complex (Brahma-related gene 1, or Brg1, and Brahma or Brm) and histone H3K4 methylation complex (Ash2, absent, small, or homeotic discs 2, or Ash2 and WD domain repeat 5, or Wdr5) were recruited to the ET-1 promoter region in endothelial cells. Over-expression of Brg1/Brm or Ash2/Wdr5 enhanced while depletion of Brg1/Brm or Ash2/Wdr5 attenuated Ang II-induced ET-1 transactivation. Endothelial-specific knockdown of Brg1/Brm or Ash2/Wdr5 ameliorated cardiac hypertrophy both in vitro and in vivo. More important, Brg1/Brm interacted with Ash2/Wdr5 on the ET-1 promoter to catalyze H3K4 methylation. The crosstalk between Brg11/Brm and Ash2/Wdr5 was mediated by myocardin-related transcription factor A (MRTF-A). In conclusion, our data have unveiled an epigenetic complex that links ET-1 transactivation in endothelial cells to Ang II-induced cardiac hypertrophy and fibrosis.
Collapse
Affiliation(s)
- Xinyu Weng
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Liming Yu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Peng Liang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Luyang Li
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xin Dai
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Bisheng Zhou
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; Department of Nursing, Jiangsu Jiankang Vocational University, Nanjing, China.
| | - Qi Chen
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| |
Collapse
|
19
|
Xu H, Wu X, Qin H, Tian W, Chen J, Sun L, Fang M, Xu Y. Myocardin-Related Transcription Factor A Epigenetically Regulates Renal Fibrosis in Diabetic Nephropathy. J Am Soc Nephrol 2014; 26:1648-60. [PMID: 25349198 DOI: 10.1681/asn.2014070678] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 09/09/2014] [Indexed: 11/03/2022] Open
Abstract
Diabetic nephropathy (DN) is one of the most common complications associated with diabetes and characterized by renal microvascular injury along with accelerated synthesis of extracellular matrix proteins causing tubulointerstitial fibrosis. Production of type I collagen, the major component of extracellular matrix, is augmented during renal fibrosis after chronic exposure to hyperglycemia. However, the transcriptional modulator responsible for the epigenetic manipulation leading to induction of type I collagen genes is not clearly defined. We show here that tubulointerstitial fibrosis as a result of DN was diminished in myocardin-related transcription factor A (MRTF-A) -deficient mice. In cultured renal tubular epithelial cells and the kidneys of mice with DN, MRTF-A was induced by glucose and synergized with glucose to activate collagen transcription. Notably, MRTF-A silencing led to the disappearance of prominent histone modifications indicative of transcriptional activation, including acetylated histone H3K18/K27 and trimethylated histone H3K4. Detailed analysis revealed that MRTF-A recruited p300, a histone acetyltransferase, and WD repeat-containing protein 5 (WDR5), a key component of the histone H3K4 methyltransferase complex, to the collagen promoters and engaged these proteins in transcriptional activation. Estradiol suppressed collagen production by dampening the expression and binding activity of MRTF-A and interfering with the interaction between p300 and WDR5 in renal epithelial cells. Therefore, targeting the MRTF-A-associated epigenetic machinery might yield interventional strategies against DN-associated renal fibrosis.
Collapse
Affiliation(s)
- Huihui Xu
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and
| | - Xiaoyan Wu
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Hao Qin
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and
| | - Wenfang Tian
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and
| | - Junliang Chen
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and School of Basic Medical Sciences, Jiangnan University, Wuxi, China
| | - Lina Sun
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and Department of Pathology and Pathophysiology, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China; and
| | - Mingming Fang
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and Department of Medicine and Nursing, Jiangsu Jiankang Vocational University, Nanjing, China
| | - Yong Xu
- State Key Laboratory of Reproductive Medicine, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Pathophysiology and
| |
Collapse
|
20
|
Yang Y, Cheng X, Tian W, Zhou B, Wu X, Xu H, Fang F, Fang M, Xu Y. MRTF-A steers an epigenetic complex to activate endothelin-induced pro-inflammatory transcription in vascular smooth muscle cells. Nucleic Acids Res 2014; 42:10460-72. [PMID: 25159611 PMCID: PMC4176337 DOI: 10.1093/nar/gku776] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Endothelin (ET-1) was initially identified as a potent vasoconstrictor contributing to the maintenance of vascular rhythm. Later studies have implicated ET-1, when aberrantly up-regulated within the vasculature, in a range of human pathologies associated with disruption of vascular homeostasis. ET-1 has been shown to invoke strong pro-inflammatory response in vascular smooth muscle cells (VSMCs); the underlying mechanism, however, remains elusive. Here, we report that the transcriptional modulator MRTF-A mediates the activation of pro-inflammatory mediators by ET-1 in VSMCs. ET-1 increased nuclear enrichment and activity of MRTF-A in cultured VSMCs. MRTF-A silencing attenuated ET-1 induced synthesis and release of pro-inflammatory mediators including IL-6, MCP-1 and IL-1 likely as a result of diminished NF-κB activity. In addition, MRTF-A was indispensible for the accumulation of active histone modifications on the gene promoters. Of intrigue, MRTF-A interacted with and recruited ASH2, a component of the mammalian histone methyltransferase complex, to transactivate pro-inflammatory genes in response to ET-1 treatment. The chromatin remodeling proteins BRG1 and BRM were also required for ET-1-dependent induction of pro-inflammatory mediators by communicating with ASH2, a process dependent on MRTF-A. In conclusion, our data have identified a novel epigenetic complex responsible for vascular inflammation inflicted by ET-1.
Collapse
Affiliation(s)
- Yuyu Yang
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China Department of Nursing, Jiangsu Jiankang Vocational University, Nanjing, Jiangsu 210029, China
| | - Xian Cheng
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Wenfang Tian
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Bisheng Zhou
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Xiaoyan Wu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Huihui Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Fei Fang
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | - Mingming Fang
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu 210009, China
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology and Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| |
Collapse
|
21
|
Weng X, Cheng X, Wu X, Xu H, Fang M, Xu Y. Sin3B mediates collagen type I gene repression by interferon gamma in vascular smooth muscle cells. Biochem Biophys Res Commun 2014; 447:263-70. [DOI: 10.1016/j.bbrc.2014.03.140] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 03/25/2014] [Indexed: 11/26/2022]
|
22
|
Yuan Z, Chen J, Chen D, Xu G, Xia M, Xu Y, Gao Y. Megakaryocytic leukemia 1 (MKL1) regulates hypoxia induced pulmonary hypertension in rats. PLoS One 2014; 9:e83895. [PMID: 24647044 PMCID: PMC3960100 DOI: 10.1371/journal.pone.0083895] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 11/18/2013] [Indexed: 11/19/2022] Open
Abstract
Hypoxia induced pulmonary hypertension (HPH) represents a complex pathology that involves active vascular remodeling, loss of vascular tone, enhanced pulmonary inflammation, and increased deposition of extracellular matrix proteins. Megakaryocytic leukemia 1 (MKL1) is a transcriptional regulator known to influence cellular response to stress signals in the vasculature. We report here that in response to chronic hypobaric hypoxia, MKL1 expression was up-regulated in the lungs in rats. Short hairpin RNA (shRNA) mediated depletion of MKL1 significantly ameliorated the elevation of pulmonary arterial pressure in vivo with a marked alleviation of vascular remodeling. MKL1 silencing also restored the expression of NO, a key vasoactive molecule necessary for the maintenance of vascular tone. In addition, hypoxia induced pulmonary inflammation was dampened in the absence of MKL1 as evidenced by normalized levels of pro-inflammatory cytokines and chemokines as well as reduced infiltration of pro-inflammatory immune cells in the lungs. Of note, MKL1 knockdown attenuated fibrogenesis in the lungs as indicated by picrosirius red staining. Finally, we demonstrate that MKL1 mediated transcriptional activation of type I collagen genes in smooth muscle cells under hypoxic conditions. In conclusion, we data highlight a previously unidentified role for MKL1 in the pathogenesis of HPH and as such lay down groundwork for future investigation and drug development.
Collapse
MESH Headings
- Animals
- Collagen Type I/genetics
- Collagen Type I/metabolism
- Cytokines/biosynthesis
- Gene Expression Regulation
- Hypertension, Pulmonary/etiology
- Hypertension, Pulmonary/genetics
- Hypertension, Pulmonary/physiopathology
- Hypoxia/complications
- Hypoxia/genetics
- Hypoxia/physiopathology
- Male
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Pulmonary Artery/metabolism
- Pulmonary Artery/physiopathology
- RNA, Messenger/antagonists & inhibitors
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- RNA, Small Interfering/genetics
- RNA, Small Interfering/metabolism
- Rats
- Rats, Sprague-Dawley
- Signal Transduction
- Transcription Factors/antagonists & inhibitors
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Vascular Resistance
Collapse
Affiliation(s)
- Zhibin Yuan
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, Ministry of Education, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, PLA, Third Military Medical University, Chongqing, China
| | - Jian Chen
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, Ministry of Education, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, PLA, Third Military Medical University, Chongqing, China
| | - Dewei Chen
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, Ministry of Education, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, PLA, Third Military Medical University, Chongqing, China
| | - Gang Xu
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, Ministry of Education, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, PLA, Third Military Medical University, Chongqing, China
| | - Minjie Xia
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yong Xu
- Key Laboratory of Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, Jiangsu, China
- * E-mail: (YX); (YQG)
| | - Yuqi Gao
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, Ministry of Education, Third Military Medical University, Chongqing, China
- Key Laboratory of High Altitude Medicine, PLA, Third Military Medical University, Chongqing, China
- * E-mail: (YX); (YQG)
| |
Collapse
|
23
|
Chen D, Fang F, Yang Y, Chen J, Xu G, Xu Y, Gao Y. Brahma-related gene 1 (Brg1) epigenetically regulates CAM activation during hypoxic pulmonary hypertension. Cardiovasc Res 2013; 100:363-73. [PMID: 24042015 DOI: 10.1093/cvr/cvt214] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
AIMS Establishment of an inflammatory milieu following elevated leukocyte adhesion to the vascular endothelium, which is mediated by transcriptional activation of cell adhesion molecules (CAMs), contributes to the pathogenesis of chronic hypoxia-induced pulmonary hypertension (HPH). The epigenetic switch that dictates CAM transactivation in response to hypoxia in endothelial cells leading up to HPH is not fully appreciated. METHODS AND RESULTS We report here that brahma-related gene 1 (Brg1) and brahma (Brm), two catalytic components of the mammalian chromatin remodelling complex, were induced in cultured endothelial cells challenged with hypoxia in vitro as well as in pulmonary arteries in an animal model of HPH. Over-expression of Brg1/Brm enhanced, while the depletion of Brg1/Brm attenuated, CAM transactivation and adhesion of leukocytes. Endothelial-specific deletion of Brg1/Brm ameliorated vascular inflammation and HPH in mice. Chromatin immunoprecipitation (ChIP) and re-ChIP assays revealed that hypoxia up-regulated the occupancies of Brg1 and Brm on CAM promoters in a nuclear factor κB (NF-κB) -dependent manner. Finally, Brg1 and Brm activated CAM transcription by altering the chromatin structure surrounding the CAM promoters. CONCLUSION Our data suggest that Brg1 provides the crucial epigenetic link to hypoxia-induced CAM induction and leukocyte adhesion that engenders endothelial malfunction and pathogenesis of HPH. As such, targeting Brg1 in endothelial cells may yield promising strategies in the intervention and/or prevention of HPH.
Collapse
Affiliation(s)
- Dewei Chen
- Department of Pathophysiology and High Altitude Physiology, College of High Altitude Military Medicine, Chongqing 400038, China
| | | | | | | | | | | | | |
Collapse
|
24
|
Tian W, Xu H, Fang F, Chen Q, Xu Y, Shen A. Brahma-related gene 1 bridges epigenetic regulation of proinflammatory cytokine production to steatohepatitis in mice. Hepatology 2013; 58:576-88. [PMID: 23281043 DOI: 10.1002/hep.26207] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2012] [Accepted: 12/11/2012] [Indexed: 01/07/2023]
Abstract
UNLABELLED Chronic inflammation, inflicted by the spillover of proinflammatory mediators, links metabolic dysfunction to nonalcoholic steatohepatitis (NASH). The epigenetic maneuverings that underscore accelerated synthesis of proinflammatory mediators in response to nutritional inputs are not clearly defined. Here we report that the ATP-dependent chromatin remodeling proteins Brahma-related gene 1 (Brg1) and Brahma (Brm) were up-regulated in vitro in cultured hepatocytes treated with free fatty acid or glucose and in vivo in animal models of NASH. Occupancy of Brg1 and Brm on the promoter regions of proinflammatory genes was increased in vitro in cells and ex vivo in liver tissues. Estradiol suppressed the induction and recruitment of Brg1/Brm by palmitate. Recruitment of Brg1 and Brm relied on nuclear factor kappa B/p65; reciprocally, Brg1 and Brm contributed to the stabilization of p65 binding. Importantly, overexpression of Brg1/Brm enhanced, whereas knockdown of Brg1/Brm attenuated, the induction of proinflammatory mediators in hepatocytes challenged with excessive nutrient. Mechanistically, Brg1 and Brm were involved in the maintenance of a chromatin microenvironment marked by active histone modifications and friendly to the access of the general transcriptional machinery. Finally, depletion of Brg1/Brm by short hairpin RNA attenuated the release of proinflammatory mediators in the liver and significantly ameliorated hepatic pathology in NASH mice. CONCLUSION Our data illustrate a Brg1-dependent pathway that connects the epigenetic regulation of proinflammatory genes to the pathogenesis of NASH and point to a potential druggable target in the therapeutic intervention of NASH.
Collapse
Affiliation(s)
- Wenfang Tian
- State Key Laboratory of Reproductive Medicine, Department of Pathophysiology, Key Laboratory of Cardiovascular Disease and Molecular Intervention, Nanjing Medical University, Nanjing, China
| | | | | | | | | | | |
Collapse
|
25
|
Sun L, Li H, Chen J, Iwasaki Y, Kubota T, Matsuoka M, Shen A, Chen Q, Xu Y. PIASy mediates hypoxia-induced SIRT1 transcriptional repression and epithelial-to-mesenchymal transition in ovarian cancer cells. J Cell Sci 2013; 126:3939-47. [PMID: 23843607 DOI: 10.1242/jcs.127381] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Epithelial-mesenchymal transition (EMT) has an essential role in organogenesis and contributes to a host of pathologies, including carcinogenesis. Hypoxia (low oxygen supply) aids tumor metastasis in part by promoting EMT in cancer cells. The underlying mechanism whereby hypoxia orchestrates EMT remains poorly defined. Here we report that SIRT1, a multifaceted player in tumorigenesis, opposed ovarian cancer metastasis in vitro and in vivo by impeding EMT. Hypoxic stress downregulated the expression of SIRT1, primarily at the transcriptional level, by reducing the occupancy of the transcriptional activator Sp1 on the proximal promoter of the SIRT1 gene in a SUMOylation-dependent manner. Further analysis revealed that the SUMO E3 ligase PIASy (also known as PIAS4) was induced by hypoxia and prevented Sp1 from binding to the SIRT1 promoter. Conversely, knockdown of PIASy by small interfering RNA (siRNA) restored Sp1 binding and SIRT1 expression in cancer cells challenged with hypobaric hypoxia, reversed cancer cell EMT, and attenuated metastasis in vivo in nude mice. Importantly, analysis of human ovarian tumor specimens indicated that PIASy expression was positively, whereas SIRT1 expression was inversely, correlated with cancer aggressiveness. In summary, our work has identified a new pathway that links downregulation of SIRT1 to hypoxia-induced EMT in ovarian cancer cells and, as such, sheds light on the development of novel anti-tumor therapeutics.
Collapse
Affiliation(s)
- Lina Sun
- State Key Laboratory of Reproductive Medicine, Department of Pathophysiology, Nanjing Medical University, 140 Hanzhong Rd, Nanjing 210029, China
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Fang M, Xia J, Wu X, Kong H, Wang H, Xie W, Xu Y. Adenosine signaling inhibits CIITA-mediated MHC class II transactivation in lung fibroblast cells. Eur J Immunol 2013; 43:2162-73. [PMID: 23681904 DOI: 10.1002/eji.201343461] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/09/2013] [Accepted: 05/13/2013] [Indexed: 01/28/2023]
Abstract
Efficient antigen presentation by major histocompatibility complex (MHC) molecules represents a critical process in adaptive immunity. Class II transactivator (CIITA) is considered the master regulator of MHC class II (MHC II) transcription. Previously, we have shown that CIITA expression is upregulated in smooth muscle cells deficient in A2b adenosine receptor. Here, we report that treatment with the adenosine receptor agonist adenosine-5'N-ethylcarboxamide (NECA) attenuated MHC II transcription in lung fibro-blast cells as a result of CIITA repression. Further analysis revealed that NECA preferentially abrogated CIITA transcription through promoters III and IV. Blockade with a selective A2b receptor antagonist MRS-1754 restored CIITA-dependent MHC II transactivation. Forskolin, an adenylyl cyclase activator, achieved the same effect as NECA. A2b signaling repressed CIITA transcription by altering histone modifications and recruitment of key factors on the CIITA promoters in a STAT1-dependent manner. MRS-1754 blocked the antagonism of transforming growth factor beta (TGF-β) in CIITA induction by interferon gamma (IFN-γ), alluding to a potential dialogue between TGF-β and adenosine signaling pathways. Finally, A2b signaling attenuated STAT1 phosphorylation and stimulated TGF-β synthesis. In conclusion, we have identified an adenosine-A2b receptor-adenylyl cyclase axis that influences CIITA-mediated MHC II transactivation in lung fibroblast cells and as such have provided invaluable insights into the development of novel immune-modulatory strategies.
Collapse
Affiliation(s)
- Mingming Fang
- Department of Surgery, Jiangsu Jiankang Vocational College, Nanjing, China
| | | | | | | | | | | | | |
Collapse
|
27
|
Yang Y, Chen D, Yuan Z, Fang F, Cheng X, Xia J, Fang M, Xu Y, Gao Y. Megakaryocytic leukemia 1 (MKL1) ties the epigenetic machinery to hypoxia-induced transactivation of endothelin-1. Nucleic Acids Res 2013; 41:6005-17. [PMID: 23625963 PMCID: PMC3695508 DOI: 10.1093/nar/gkt311] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Increased synthesis of endothelin-1 (ET-1) by human vascular endothelial cells (HVECs) in response to hypoxia underscores persistent vasoconstriction observed in patients with pulmonary hypertension. The molecular mechanism whereby hypoxia stimulates ET-1 gene transcription is not well understood. Here we report that megakaryocytic leukemia 1 (MKL1) potentiated hypoxia-induced ET-1 transactivation in HVECs. Disruption of MKL1 activity by either a dominant negative mutant or small interfering RNA mediated knockdown dampened ET-1 synthesis. MKL1 was recruited to the proximal ET-1 promoter region (−81/+150) in HVECs challenged with hypoxic stress by the sequence-specific transcription factor serum response factor (SRF). Depletion of SRF blocked MKL1 recruitment and blunted ET-1 transactivation by hypoxia. Chromatin immunoprecipitation analysis of the ET-1 promoter revealed that MKL1 loss-of-function erased histone modifications consistent with transcriptional activation. In addition, MKL1 was indispensable for the occupancy of Brg1 and Brm, key components of the chromatin remodeling complex, on the ET-1 promoter. Brg1 and Brm modulated ET-1 transactivation by impacting histone modifications. In conclusion, our data have delineated a MKL1-centered complex that links epigenetic maneuverings to ET-1 transactivation in HVECs under hypoxic conditions.
Collapse
Affiliation(s)
- Yuyu Yang
- Key Laboratory of Cardiovascular Disease, Nanjing Medical University, Nanjing, Jiangsu 210029, China
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Xia J, Wu X, Yang Y, Zhao Y, Fang M, Xie W, Wang H, Xu Y. SIRT1 deacetylates RFX5 and antagonizes repression of collagen type I (COL1A2) transcription in smooth muscle cells. Biochem Biophys Res Commun 2012; 428:264-70. [PMID: 23079621 DOI: 10.1016/j.bbrc.2012.10.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 10/08/2012] [Indexed: 10/27/2022]
Abstract
Decreased expression of collagen by vascular smooth muscle cells (SMCs) within the atherosclerotic plaque contributes to the thinning of the fibrous cap and poses a great threat to plaque rupture. Elucidation of the mechanism underlying repressed collagen type I (COL1A2) gene would potentially provide novel solutions that can prevent rupture-induced complications. We have previously shown that regulatory factor for X-box (RFX5) binds to the COL1A2 transcription start site and represses its transcription. Here we report that SIRT1, an NAD-dependent, class III deacetylase, forms a complex with RFX5. Over-expression of SIRT1 or NAMPT, which synthesizes NAD+ to activate SIRT1, or treatment with the SIRT1 agonist resveratrol decreases RFX5 acetylation and disrupts repression of the COL1A2 promoter activity by RFX5. On the contrary, knockdown of SIRT1 or treatment with SIRT1 inhibitors induces RFX5 acetylation and enhances the repression of collagen transcription. SIRT1 antagonizes RFX5 activity by promoting its nuclear expulsion and proteasomal degradation hence dampening its binding to the COL1A2 promoter. The pro-inflammatory cytokine IFN-γ represses COL1A2 transcription by down-regulating SIRT1 expression in SMCs. Therefore, our data have identified as novel pathway whereby SIRT1 maintains collagen synthesis in SMCs by modulating RFX5 activity.
Collapse
Affiliation(s)
- Jun Xia
- Department of Respiratory Medicine, The First Affiliated Hospital of Nanjing Medical University, China
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Li P, Zhao Y, Wu X, Xia M, Fang M, Iwasaki Y, Sha J, Chen Q, Xu Y, Shen A. Interferon gamma (IFN-γ) disrupts energy expenditure and metabolic homeostasis by suppressing SIRT1 transcription. Nucleic Acids Res 2011; 40:1609-20. [PMID: 22064865 PMCID: PMC3287208 DOI: 10.1093/nar/gkr984] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Chronic inflammation impairs metabolic homeostasis and is intimately correlated with the pathogenesis of type 2 diabetes. The pro-inflammatory cytokine IFN-γ is an integral part of the metabolic inflammation circuit and contributes significantly to metabolic dysfunction. The underlying mechanism, however, remains largely unknown. In the present study, we report that IFN-γ disrupts the expression of genes key to cellular metabolism and energy expenditure by repressing the expression and activity of SIRT1 at the transcription level. Further analysis reveals that IFN-γ requires class II transactivator (CIITA) to repress SIRT1 transcription. CIITA, once induced by IFN-γ, is recruited to the SIRT1 promoter by hypermethylated in cancer 1 (HIC1) and promotes down-regulation of SIRT1 transcription via active deacetylation of core histones surrounding the SIRT1 proximal promoter. Silencing CIITA or HIC1 restores SIRT1 activity and expression of metabolic genes in skeletal muscle cells challenged with IFN-γ. Therefore, our data delineate an IFN-γ/HIC1/CIITA axis that contributes to metabolic dysfunction by suppressing SIRT1 transcription in skeletal muscle cells and as such shed new light on the development of novel therapeutic strategies against type 2 diabetes.
Collapse
Affiliation(s)
- Ping Li
- State Key Laboratory of Reproductive Medicine and Department of Pathophysiology, Key Laboratory of Cardiovascular Disease,The Second Affiliated Hospital, Nanjing Medical University, Nanjing, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|