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Jin J, Zhang M. Research progress on the role of extracellular vesicles in the pathogenesis of diabetic kidney disease. Ren Fail 2024; 46:2352629. [PMID: 38769599 PMCID: PMC11107856 DOI: 10.1080/0886022x.2024.2352629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 05/02/2024] [Indexed: 05/22/2024] Open
Abstract
Diabetic kidney disease (DKD) is a serious complication of diabetes mellitus (DM) and has become the main cause of end-stage renal disease worldwide. In recent years, with the increasing incidence of DM, the pathogenesis of DKD has received increasing attention. The pathogenesis of DKD is diverse and complex. Extracellular vesicles (EVs) contain cell-derived membrane proteins, nucleic acids (such as DNA and RNA) and other important cellular components and are involved in intercellular information and substance transmission. In recent years, an increasing number of studies have confirmed that EVs play an important role in the development of DKD. The purpose of this paper is to explain the potential diagnostic value of EVs in DKD, analyze the mechanism by which EVs participate in intercellular communication, and explore whether EVs may become drug carriers for targeted therapy to provide a reference for promoting the implementation and application of exosome therapy strategies in clinical practice.
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Affiliation(s)
- Jiangyuan Jin
- Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Mianzhi Zhang
- Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital, Tianjin, China
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2
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Hasegawa K, Tamaki M, Sakamaki Y, Wakino S. Nmnat1 Deficiency Causes Mitoribosome Excess in Diabetic Nephropathy Mediated by Transcriptional Repressor HIC1. Int J Mol Sci 2024; 25:6384. [PMID: 38928090 PMCID: PMC11204038 DOI: 10.3390/ijms25126384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/31/2024] [Accepted: 06/07/2024] [Indexed: 06/28/2024] Open
Abstract
Nicotinamide adenine dinucleotide (NAD) is involved in renal physiology and is synthesized by nicotinamide mononucleotide adenylyltransferase (NMNAT). NMNAT exists as three isoforms, namely, NMNAT1, NMNAT2, and NMNAT3, encoded by Nmnat1, Nmnat2, and Nmnat3, respectively. In diabetic nephropathy (DN), NAD levels decrease, aggravating renal fibrosis. Conversely, sodium-glucose cotransporter-2 inhibitors increase NAD levels, mitigating renal fibrosis. In this regard, renal NAD synthesis has recently gained attention. However, the renal role of Nmnat in DN remains uncertain. Therefore, we investigated the role of Nmnat by establishing genetically engineered mice. Among the three isoforms, NMNAT1 levels were markedly reduced in the proximal tubules (PTs) of db/db mice. We examined the phenotypic changes in PT-specific Nmnat1 conditional knockout (CKO) mice. In CKO mice, Nmnat1 expression in PTs was downregulated when the tubules exhibited albuminuria, peritubular type IV collagen deposition, and mitochondrial ribosome (mitoribosome) excess. In CKO mice, Nmnat1 deficiency-induced mitoribosome excess hindered mitoribosomal translation of mitochondrial inner membrane-associated oxidative phosphorylation complex I (CI), CIII, CIV, and CV proteins and mitoribosomal dysfunction. Furthermore, the expression of hypermethylated in cancer 1, a transcription repressor, was downregulated in CKO mice, causing mitoribosome excess. Nmnat1 overexpression preserved mitoribosomal function, suggesting its protective role in DN.
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Affiliation(s)
- Kazuhiro Hasegawa
- Department of Nephrology, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan; (M.T.); (S.W.)
| | - Masanori Tamaki
- Department of Nephrology, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan; (M.T.); (S.W.)
| | - Yusuke Sakamaki
- Department of Internal Medicine, Tokyo Dental College Ichikawa General Hospital, Chiba 272-8583, Japan;
| | - Shu Wakino
- Department of Nephrology, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan; (M.T.); (S.W.)
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3
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Huang Y, Wang D, Zhang W, Yuan X, Li K, Zhang Y, Zeng M. Identification of hub genes and pathways associated with cellular senescence in diabetic foot ulcers via comprehensive transcriptome analysis. J Cell Mol Med 2024; 28:e18043. [PMID: 37985432 PMCID: PMC10805497 DOI: 10.1111/jcmm.18043] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 10/20/2023] [Accepted: 10/25/2023] [Indexed: 11/22/2023] Open
Abstract
This research aimed to find important genes and pathways related to cellular senescence (CS) in diabetic foot ulcers (DFU) and to estimate the possible pathways through which CS affects diabetic foot healing. The GSE80178 dataset was acquired from the Gene Expression Omnibus (GEO) database, containing six DFU and three diabetic foot skin (DFS) samples. The limma package was used to identify differentially expressed genes (DEGs). At the same time, DEGs associated with CS (CS-DEGs) were found using the CellAge database. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were conducted on the CS-DEGs. A protein-protein interaction (PPI) network was built using the String database, and the cytoHubba plug-in within Cytoscape helped identify hub genes. Lastly, the miRNA-TF-mRNA regulatory network for these hub genes was established. In total, 66 CS-DEGs were obtained. These genes mainly focus on CS, Kaposi sarcoma-associated herpesvirus infection and Toll-like receptor signalling pathway. Eight hub genes were identified to regulate cell senescence in DFU, including TP53, SRC, SIRT1, CCND1, EZH2, CXCL8, AR and CDK4. According to miRNA-TF-mRNA regulatory network, hsa-mir-132-3p/SIRT1/EZH2 axis is involved in senescence cell accumulation in DFU.
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Affiliation(s)
- Yike Huang
- Department of EmergencyThe First Affiliated Hospital of Chengdu Medical CollegeChengduChina
| | - Dongqing Wang
- Department of EmergencyThe First Affiliated Hospital of Chengdu Medical CollegeChengduChina
| | - Wen Zhang
- School of Clinical Medicine, Chengdu Medical CollegeChengduChina
- Department of Medical LaboratoryXindu District People’ s Hospital of ChengduChengduChina
| | - Xue Yuan
- Department of PediatricsChongqing Bishan Area Women and Children HospitalChongqingChina
| | - Ke Li
- Department of EmergencyThe First Affiliated Hospital of Chengdu Medical CollegeChengduChina
| | - Yuanyuan Zhang
- Department of Medical LaboratoryXindu District People’ s Hospital of ChengduChengduChina
| | - Mingqiang Zeng
- Department of EmergencyThe First Affiliated Hospital of Chengdu Medical CollegeChengduChina
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4
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Shelke V, Yelgonde V, Kale A, Lech M, Gaikwad AB. Epigenetic regulation of mitochondrial-endoplasmic reticulum dynamics in kidney diseases. J Cell Physiol 2023; 238:1716-1731. [PMID: 37357431 DOI: 10.1002/jcp.31058] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/25/2023] [Accepted: 05/26/2023] [Indexed: 06/27/2023]
Abstract
Kidney diseases are serious health problems affecting >800 million individuals worldwide. The high number of affected individuals and the severe consequences of kidney dysfunction demand an intensified effort toward more effective prevention and treatment. The pathophysiology of kidney diseases is complex and comprises diverse organelle dysfunctions including mitochondria and endoplasmic reticulum (ER). The recent findings prove interactions between the ER membrane and nearly all cell compartments and give new insights into molecular events involved in cellular mechanisms in health and disease. Interactions between the ER and mitochondrial membranes, known as the mitochondria-ER contacts regulate kidney physiology by interacting with each other via membrane contact sites (MCS). ER controls mitochondrial dynamics through ER stress sensor proteins or by direct communication via mitochondria-associated ER membrane to activate signaling pathways such as apoptosis, calcium transport, and autophagy. More importantly, these organelle dynamics are found to be regulated by several epigenetic mechanisms such as DNA methylation, histone modifications, and noncoding RNAs and can be a potential therapeutic target against kidney diseases. However, a thorough understanding of the role of epigenetic regulation of organelle dynamics and their functions is not well understood. Therefore, this review will unveil the role of epigenetic mechanisms in regulating organelle dynamics during various types of kidney diseases. Moreover, we will also shed light on different stress origins in organelles leading to kidney disease. Henceforth, by understanding this we can target epigenetic mechanisms to maintain/control organelle dynamics and serve them as a novel therapeutic approach against kidney diseases.
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Affiliation(s)
- Vishwadeep Shelke
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan, India
| | - Vinayak Yelgonde
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan, India
| | - Ajinath Kale
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan, India
| | - Maciej Lech
- Department of Internal Medicine IV, Division of Nephrology, Hospital of the Ludwig Maximilians University Munich, Munich, Germany
| | - Anil Bhanudas Gaikwad
- Laboratory of Molecular Pharmacology, Department of Pharmacy, Birla Institute of Technology and Science Pilani, Pilani Campus, Pilani, Rajasthan, India
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Kourtidou C, Tziomalos K. The Role of Histone Modifications in the Pathogenesis of Diabetic Kidney Disease. Int J Mol Sci 2023; 24:ijms24066007. [PMID: 36983082 PMCID: PMC10051814 DOI: 10.3390/ijms24066007] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/15/2023] [Accepted: 03/22/2023] [Indexed: 03/30/2023] Open
Abstract
Diabetic kidney disease (DKD) is the leading cause of chronic kidney disease. The pathogenesis of DKD is multifactorial, with several molecular pathways implicated. Recent data suggest that histone modification plays an important role in the development and progression of DKD. Histone modification appears to induce oxidative stress, inflammation and fibrosis in the diabetic kidney. In the present review, we summarize the current knowledge on the association between histone modification and DKD.
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Affiliation(s)
- Christodoula Kourtidou
- First Propedeutic Department of Internal Medicine, AHEPA Hospital, Medical School, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
| | - Konstantinos Tziomalos
- First Propedeutic Department of Internal Medicine, AHEPA Hospital, Medical School, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
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Demethylation of H3K9 and H3K27 Contributes to the Tubular Renal Damage Triggered by Endoplasmic Reticulum Stress. Antioxidants (Basel) 2022; 11:antiox11071355. [PMID: 35883846 PMCID: PMC9312208 DOI: 10.3390/antiox11071355] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/06/2022] [Accepted: 07/08/2022] [Indexed: 12/10/2022] Open
Abstract
Loss of protein homeostasis (proteostasis) in the endoplasmic reticulum (ER) activates the unfolded protein response (UPR), restoring correct protein folding. Sustained ER stress exacerbates activation of the major UPR branches (IRE1α/XBP1, PERK/ATF4, ATF6), inducing expression of numerous genes involved in inflammation, cell death, autophagy, and oxidative stress. We investigated whether epigenetic dynamics mediated by histone H3K9 and H3K27 methylation might help to reduce or inhibit the exacerbated and maladaptive UPR triggered in tubular epithelial cells. Epigenetic treatments, specific silencing, and chromatin immunoprecipitation assays were performed in human proximal tubular cells subjected to ER stress. Pharmacological blockage of KDM4C and JMJD3 histone demethylases with SD-70 and GSKJ4, respectively, enhanced trimethylation of H3K9 and H3K27 in the ATF4 and XBP1 genes, inhibiting their expression and that of downstream genes. Conversely, specific G9a and EZH2 knockdown revealed increases in ATF4 and XBP1 expression. This is a consequence of the reduced recruitment of G9a and EZH2 histone methylases, diminished H3K9me3 and H3K27me3 levels, and enhanced histone acetylation at the ATF4 and XBP1 promoter region. G9a and EZH2 cooperate to maintain the repressive chromatin structure in both UPR-induced genes, ATF4 and XBP1. Therefore, preserving histone H3K9 and H3K27 methylation could ameliorate the ER stress, and consequently the oxidative stress and the triggered pathological processes that aggravate renal damage.
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Zhou X, Chen H, Li J, Shi Y, Zhuang S, Liu N. The Role and Mechanism of Lysine Methyltransferase and Arginine Methyltransferase in Kidney Diseases. Front Pharmacol 2022; 13:885527. [PMID: 35559246 PMCID: PMC9086358 DOI: 10.3389/fphar.2022.885527] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/08/2022] [Indexed: 11/13/2022] Open
Abstract
Methylation can occur in both histones and non-histones. Key lysine and arginine methyltransferases under investigation for renal disease treatment include enhancer of zeste homolog 2 (EZH2), G9a, disruptor of telomeric silencing 1-like protein (DOT1L), and protein arginine methyltransferases (PRMT) 1 and 5. Recent studies have shown that methyltransferases expression and activity are also increased in several animal models of kidney injury, such as acute kidney injury(AKI), obstructive nephropathy, diabetic nephropathy and lupus nephritis. The inhibition of most methyltransferases can attenuate kidney injury, while the role of methyltransferase in different animal models remains controversial. In this article, we summarize the role and mechanism of lysine methyltransferase and arginine methyltransferase in various kidney diseases and highlight methyltransferase as a potential therapeutic target for kidney diseases.
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Affiliation(s)
- Xun Zhou
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Hui Chen
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jinqing Li
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yingfeng Shi
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shougang Zhuang
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
- Department of Medicine, Rhode Island Hospital and Alpert Medical School, Brown University, Providence, RI, United States
| | - Na Liu
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
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GNL3 Regulates SIRT1 Transcription and Promotes Hepatocellular Carcinoma Stem Cell-Like Features and Metastasis. JOURNAL OF ONCOLOGY 2022; 2022:1555670. [PMID: 35432540 PMCID: PMC9010172 DOI: 10.1155/2022/1555670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 01/05/2022] [Indexed: 12/02/2022]
Abstract
The expression of GNL3 in hepatocellular carcinoma was detected, and its effect on the proliferation and metastasis of hepatocellular carcinoma cells was investigated. Hepatocellular carcinoma and adjacent tissues were collected. The mRNA and protein expression levels of GNL3 were detected by qRT-PCR, Western blot, and immunohistochemistry. The relationship between GNL3 and the prognosis of liver cancer was analysed using public databases. A GNL3 interfering plasmid was constructed, and the effects of GNL3 on the proliferation of HepG2 and PLC-PRF-5 hepatoma cells were detected by the CCK-8 method. Transwell chamber assays were used to detect the effects of GNL3 on the migration and invasion of hepatocellular carcinoma cells. The effects of GNL3 on SIRT1 expression and stem cell markers were analysed. The effect of GNL3 on the proliferation of hepatocellular carcinoma was detected in a subcutaneous tumor-bearing animal model. The results showed that the mRNA and protein levels of GNL3 were higher than those of adjacent tissues. The overall survival (OS) of HCC patients with high GNL3 expression was worse. In vivo and in vitro experiments confirmed that silencing GNL3 could inhibit the proliferation, migration, and invasion of hepatocellular carcinoma cells. Mechanistic studies have shown that GNL3 regulates SIRT1 expression. GNL3 mediates the stem cell-like properties of HCC cells through SIRT1. In conclusion, this study found that GNL3 increased expression in hepatocellular carcinoma, which promoted the malignant biological behavior of hepatocellular carcinoma cells and was related to the cell dry phenotype. This study has certain significance in evaluating the prognosis of HCC patients.
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Qi W, Hu C, Zhao D, Li X. SIRT1-SIRT7 in Diabetic Kidney Disease: Biological Functions and Molecular Mechanisms. Front Endocrinol (Lausanne) 2022; 13:801303. [PMID: 35634495 PMCID: PMC9136398 DOI: 10.3389/fendo.2022.801303] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 04/15/2022] [Indexed: 12/14/2022] Open
Abstract
Diabetic kidney disease (DKD) is a severe microvascular complication in patients with diabetes and is one of the main causes of renal failure. The current clinical treatment methods for DKD are not completely effective, and further exploration of the molecular mechanisms underlying the pathology of DKD is necessary to improve and promote the treatment strategy. Sirtuins are class III histone deacetylases, which play an important role in many biological functions, including DNA repair, apoptosis, cell cycle, oxidative stress, mitochondrial function, energy metabolism, lifespan, and aging. In the last decade, research on sirtuins and DKD has gained increasing attention, and it is important to summarize the relationship between DKD and sirtuins to increase the awareness of DKD and improve the cure rates. We have found that miRNAs, lncRNAs, compounds, or drugs that up-regulate the activity and expression of sirtuins play protective roles in renal function. Therefore, in this review, we summarize the biological functions, molecular targets, mechanisms, and signaling pathways of SIRT1-SIRT7 in DKD models. Existing research has shown that sirtuins have the potential as effective targets for the clinical treatment of DKD. This review aims to lay a solid foundation for clinical research and provide a theoretical basis to slow the development of DKD in patients.
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Affiliation(s)
- Wenxiu Qi
- Jilin Ginseng Academy, Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
- *Correspondence: Wenxiu Qi,
| | - Cheng Hu
- College of Laboratory Medicine, Jilin Medical University, Jilin City, China
| | - Daqing Zhao
- Jilin Ginseng Academy, Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
| | - Xiangyan Li
- Jilin Ginseng Academy, Key Laboratory of Active Substances and Biological Mechanisms of Ginseng Efficacy, Ministry of Education, Jilin Provincial Key Laboratory of Bio-Macromolecules of Chinese Medicine, Changchun University of Chinese Medicine, Changchun, China
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YANG X, ZHANG Y, YANG N, YU X, GAO X, ZHAO M. Parthenolide regulates DNMT1-mediated methylation of VDR promoter to relieve podocyte damage in mice with diabetic nephropathy. FOOD SCIENCE AND TECHNOLOGY 2022. [DOI: 10.1590/fst.51221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | | | - Ni YANG
- University of Chinese Medicine, China
| | - Xiao YU
- University of Chinese Medicine, China
| | - Xin GAO
- University of Chinese Medicine, China
| | - Meiyun ZHAO
- Xi’an Hospital of Traditional Chinese Medicine, China
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11
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Vasishta S, Umakanth S, Adiga P, Joshi MB. Extrinsic and intrinsic factors influencing metabolic memory in type 2 diabetes. Vascul Pharmacol 2021; 142:106933. [PMID: 34763098 DOI: 10.1016/j.vph.2021.106933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/18/2021] [Accepted: 11/04/2021] [Indexed: 12/24/2022]
Abstract
Direct and indirect influence of pathological conditions in Type 2 Diabetes (T2D) on vasculature manifests in micro and/or macro vascular complications that act as a major source of morbidity and mortality. Although preventive therapies exist to control hyperglycemia, diabetic subjects are always at risk to accrue vascular complications. One of the hypotheses explained is 'glycemic' or 'metabolic' memory, a process of permanent epigenetic change in different cell types whereby diabetes associated vascular complications continue despite glycemic control by antidiabetic drugs. Epigenetic mechanisms including DNA methylation possess a strong influence on the association between environment and gene expression, thus indicating its importance in the pathogenesis of a complex disease such as T2D. The vascular system is more prone to environmental influences and present high flexibility in response to physiological and pathological challenges. DNA methylation based epigenetic changes during metabolic memory are influenced by sustained hyperglycemia, inflammatory mediators, gut microbiome composition, lifestyle modifications and gene-nutrient interactions. Hence, understanding underlying mechanisms in manifesting vascular complications regulated by DNA methylation is of high clinical importance. The review provides an insight into various extrinsic and intrinsic factors influencing the regulation of DNA methyltransferases contributing to the pathogenesis of vascular complications during T2D.
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Affiliation(s)
- Sampara Vasishta
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
| | - Shashikiran Umakanth
- Department of Medicine, Dr. T.M.A. Pai Hospital, Manipal Academy of Higher Education, Udupi 576101, Karnataka, India
| | - Prashanth Adiga
- Department of Reproductive Medicine and Surgery (MARC), Kasturba Hospital, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India
| | - Manjunath B Joshi
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.
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12
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Serum exosomes from diabetic kidney disease patients promote pyroptosis and oxidative stress through the miR-4449/HIC1 pathway. Nutr Diabetes 2021; 11:33. [PMID: 34732690 PMCID: PMC8566490 DOI: 10.1038/s41387-021-00175-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 08/29/2021] [Accepted: 09/28/2021] [Indexed: 01/02/2023] Open
Abstract
Background Diabetic kidney disease (DKD) is a major contributor to end-stage renal disease. Several microRNAs (miRNAs) have been found to be enriched in exosomes of DKD patients, but it remains unclear if any of these miRNAs play an important role in the pathogenesis of DKD. Methods Exosomes from diabetic kidney disease (DKD) patients were isolated, and the expression of miR-4449 was measured by qRT-PCR. Reactive oxygen species (ROS) was determined by DCDFA assay kit, and pyroptosis was measured by quantifying the level of activated caspase 1. mRNA and protein levels were quantified by qRT-PCR and WB. Results In this study, we demonstrated that miR-4449 is enriched in the serum exosomes of DKD patients, and these exosomes regulate the expression of pro-inflammatory cytokines, ROS levels, and pyroptosis through miR-4449. Conclusions Our study uncovered a novel mechanism for the progression of DKD that is mediated through miR-4449 in serum exosomes, which highlights an important role for exosomes in the pathogenesis of DKD. ![]()
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Tao W, Hong Y, He H, Han Q, Mao M, Hu B, Zhang H, Huang X, You W, Liang X, Zhang Y, Li X. MicroRNA-199a-5p aggravates angiotensin II-induced vascular smooth muscle cell senescence by targeting Sirtuin-1 in abdominal aortic aneurysm. J Cell Mol Med 2021; 25:6056-6069. [PMID: 34132029 PMCID: PMC8366448 DOI: 10.1111/jcmm.16485] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 02/17/2021] [Accepted: 02/23/2021] [Indexed: 12/30/2022] Open
Abstract
Vascular smooth muscle cells (VSMCs) senescence contributes to abdominal aortic aneurysm (AAA) formation although the underlying mechanisms remain unclear. This study aimed to investigate the role of miR-199a-5p in regulating VSMC senescence in AAA. VSMC senescence was determined by a senescence-associated β-galactosidase (SA-β-gal) assay. RT-PCR and Western blotting were performed to measure miRNA and protein level, respectively. The generation of reactive oxygen species (ROS) was evaluated by H2DCFDA staining. Dual-luciferase reporter assay was used to validate the target gene of miR-199a-5p. VSMCs exhibited increased senescence in AAA tissue relative to healthy aortic tissue from control donors. Compared with VSMCs isolated from control donors (control-VSMCs), those derived from patients with AAA (AAA-VSMCs) exhibited increased cellular senescence and ROS production. Angiotensin II (Ang II) induced VSMC senescence by promoting ROS generation. The level of miR-199a-5p expression was upregulated in the plasma from AAA patients and Ang II-treated VSMCs. Mechanistically, Ang II treatment significantly elevated miR-199a-5p level, thereby stimulating ROS generation by repressing Sirt1 and consequent VSMC senescence. Nevertheless, Ang II-induced VSMC senescence was partially attenuated by a miR-199a-5p inhibitor or Sirt1 activator. Our study revealed that miR-199a-5p aggravates Ang II-induced VSMC senescence by targeting Sirt1 and that miR-199a-5p is a potential therapeutic target for AAA.
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Affiliation(s)
- Wuyuan Tao
- The Second School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Yimei Hong
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Haiwei He
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Qian Han
- Department of MedicineState Key Laboratory of Respiratory DiseaseThe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou Institute of Respiratory HealthGuangzhouChina
| | - Mengmeng Mao
- Department of MedicineState Key Laboratory of Respiratory DiseaseThe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou Institute of Respiratory HealthGuangzhouChina
| | - Bei Hu
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Hao Zhang
- School of PharmacyBengbu Medical CollegeBengbuChina
| | - Xiaoran Huang
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Wei You
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Xiaoting Liang
- Clinical Translational Medical Research CenterShanghai East HospitalTongji University School of MedicineShanghaiChina
| | - Yuelin Zhang
- The Second School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Xin Li
- The Second School of Clinical MedicineSouthern Medical UniversityGuangzhouChina
- Department of Emergency MedicineDepartment of Emergency and Critical Care MedicineGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
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14
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Li T, Yu C, Zhuang S. Histone Methyltransferase EZH2: A Potential Therapeutic Target for Kidney Diseases. Front Physiol 2021; 12:640700. [PMID: 33679454 PMCID: PMC7930071 DOI: 10.3389/fphys.2021.640700] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 01/11/2021] [Indexed: 12/19/2022] Open
Abstract
Enhancer of zeste homolog 2 (EZH2) is a histone-lysine N-methyltransferase enzyme that catalyzes the addition of methyl groups to histone H3 at lysine 27, leading to gene silencing. Mutation or over-expression of EZH2 has been linked to many cancers including renal carcinoma. Recent studies have shown that EZH2 expression and activity are also increased in several animal models of kidney injury, such as acute kidney injury (AKI), renal fibrosis, diabetic nephropathy, lupus nephritis (LN), and renal transplantation rejection. The pharmacological and/or genetic inhibition of EZH2 can alleviate AKI, renal fibrosis, and LN, but potentiate podocyte injury in animal models, suggesting that the functional role of EZH2 varies with renal cell type and disease model. In this article, we summarize the role of EZH2 in the pathology of renal injury and relevant mechanisms and highlight EZH2 as a potential therapeutic target for kidney diseases.
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Affiliation(s)
- Tingting Li
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Chao Yu
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shougang Zhuang
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.,Department of Medicine, Alpert Medical School and Rhode Island Hospital, Brown University, Providence, RI, United States
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Wu T, Wang H, Xin X, Yang J, Hou Y, Fang M, Lu X, Xu Y. An MRTF-A-Sp1-PDE5 Axis Mediates Angiotensin-II-Induced Cardiomyocyte Hypertrophy. Front Cell Dev Biol 2020; 8:839. [PMID: 33015041 PMCID: PMC7509415 DOI: 10.3389/fcell.2020.00839] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 08/05/2020] [Indexed: 12/24/2022] Open
Abstract
Cardiac hypertrophy is a critical intermediate step in the pathogenesis of heart failure. A myriad of signaling networks converge on cardiomyocytes to elicit hypertrophic growth in response to various injurious stimuli. In the present study, we investigated the cardiomyocyte-specific role of myocardin-related transcription factor A (MRTF-A) in angiotensin-II (Ang-II)-induced cardiac hypertrophy and the underlying mechanism. We report that conditional MRTF-A deletion in cardiomyocytes attenuated Ang-II-induced cardiac hypertrophy in mice. Similarly, MRTF-A knockdown or inhibition suppressed Ang-II-induced prohypertrophic response in cultured cardiomyocytes. Of note, Ang II treatment upregulated expression of phosphodiesterase 5 (PDE5), a known mediator of cardiac hypertrophy and heart failure, in cardiomyocytes, which was blocked by MRTF-A depletion or inhibition. Mechanistically, MRTF-A activated expression of specificity protein 1 (Sp1), which in turn bound to the PDE5 promoter and upregulated PDE5 transcription to promote hypertrophy of cardiomyocytes in response to Ang II stimulation. Therefore, our data unveil a novel MRTF-A–Sp1–PDE5 axis that mediates Ang-II-induced hypertrophic response in cardiomyocytes. Targeting this newly identified MRTF-A–Sp1–PDE5 axis may yield novel interventional solutions against heart failure.
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Affiliation(s)
- Teng Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Huidi Wang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xiaojun Xin
- Department of Geriatrics, Sir Run Run Hospital, Nanjing Medical University, Nanjing, China
| | - Jie Yang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yannan Hou
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Laboratory Center for Experimental Medicine, Department of Clinical Medicine, Jiangsu Health Vocational College, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Xiang Lu
- Department of Geriatrics, Sir Run Run Hospital, Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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16
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Chen B, Yuan Y, Sun L, Chen J, Yang M, Yin Y, Xu Y. MKL1 Mediates TGF-β Induced RhoJ Transcription to Promote Breast Cancer Cell Migration and Invasion. Front Cell Dev Biol 2020; 8:832. [PMID: 32984327 PMCID: PMC7478007 DOI: 10.3389/fcell.2020.00832] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 08/04/2020] [Indexed: 12/24/2022] Open
Abstract
Differential regulation of gene transcription contributes to cancer metastasis. We investigated the involvement of a Rho GTPase (RhoJ) in breast cancer metastasis focusing on the mechanism underlying RhoJ trans-activation by pro-metastatic cues. We report that expression of RhoJ was up-regulated in malignant breast cancer cells compared to more benign ones. Higher RhoJ expression was also detected in human breast cancer biopsy specimens of advanced stages. RhoJ depletion attenuated breast cancer cell migration and invasion in vitro and metastasis in vivo. The pro-metastatic stimulus TGF-β activated RhoJ via megakaryocytic leukemia 1 (MKL1). MKL1 interacted with and was recruited by ETS-related gene 1 (ERG1) to the RhoJ promoter to activate transcription. In conclusion, our data delineate a novel transcriptional pathway that contributes to breast cancer metastasis. Targeting the ERG1-MKL1-RhoJ axis may be considered as a reasonable approach to treat malignant breast cancer.
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Affiliation(s)
- Baoyu Chen
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysioloy and Laboratory Center for Experimental Medicine, Nanjing Medical University, Nanjing, China
| | - Yibiao Yuan
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysioloy and Laboratory Center for Experimental Medicine, Nanjing Medical University, Nanjing, China
| | - Lina Sun
- Department of Pathology and Pathophysiology, College of Life and Basic Medical Sciences, Soochow University, Suzhou, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Junliang Chen
- Department of Pathophysiology, Wuxi Medical School, Jiangnan University, Wuxi, China
| | - Mengzhu Yang
- Department of Oncology, First Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Yongmei Yin
- Department of Oncology, First Hospital Affiliated to Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysioloy and Laboratory Center for Experimental Medicine, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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Li N, Liu S, Zhang Y, Yu L, Hu Y, Wu T, Fang M, Xu Y. Transcriptional Activation of Matricellular Protein Spondin2 (SPON2) by BRG1 in Vascular Endothelial Cells Promotes Macrophage Chemotaxis. Front Cell Dev Biol 2020; 8:794. [PMID: 32974343 PMCID: PMC7461951 DOI: 10.3389/fcell.2020.00794] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 07/28/2020] [Indexed: 12/18/2022] Open
Abstract
The matricellular protein SPON2 plays diverse roles in the development of cardiovascular diseases. SPON2 is expressed in endothelial cells, but its transcription regulation in the context of atherogenesis remains incompletely appreciated. Here we report that SPON2 expression was up-regulated by pro-atherogenic stimuli (oxLDL and TNF-α) in vascular endothelia cells. In addition, endothelial SPON2 was elevated in Apoe–/– mice fed on a Western diet compared to the control mice. Induction of SPON2 in endothelial cells by pro-atherogenic stimuli was mediated by BRG1, a chromatin remodeling protein, both in vitro and in vivo. Further analysis revealed that BRG1 interacted with the sequence-specific transcription factor Egr-1 to activate SPON2 transcription. BRG1 contributed to SPON2 trans-activation by modulating chromatin structure surrounding the SPON2 promoter. Functionally, activation of SPON2 transcription by the Egr-1/BRG1 complex provided chemoattractive cues for macrophage trafficking. SPON2 depletion abrogated the ability of BRG1 or Egr-1 to stimulate endothelial derived chemoattractive cue for macrophage migration. On the contrary, recombinant SPON2 rescued endothelial chemo-attractability in the absence of BRG1 or Egr-1. In conclusion, our data have identified a novel transcriptional cascade in endothelial cells that may potentially promote macrophage recruitment and vascular inflammation leading to atherogenesis.
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Affiliation(s)
- Nan Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Shuai Liu
- Hainan Provincial Key Laboratory for Tropical Cardiovascular Diseases Research and Key Laboratory of Emergency and Trauma of Ministry of Education, Institute of Cardiovascular Research of the First Affiliated Hospital, Hainan Medical University, Haikou, China.,Department of Cardiology, Kaifeng People's Hospital, Kaifeng, China
| | - Yuanyuan Zhang
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Liming Yu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yanjiang Hu
- Department of Cardiothoracic Surgery, Liyang People's Hospital, Liyang, China
| | - Teng Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Department of Clinical Medicine and Laboratory Center for Experimental Medicine, Jiangsu Health Vocational Institute, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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18
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Li Z, Kong X, Zhang Y, Zhang Y, Yu L, Guo J, Xu Y. Dual roles of chromatin remodeling protein BRG1 in angiotensin II-induced endothelial-mesenchymal transition. Cell Death Dis 2020; 11:549. [PMID: 32683412 PMCID: PMC7368857 DOI: 10.1038/s41419-020-02744-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 07/01/2020] [Accepted: 07/02/2020] [Indexed: 12/14/2022]
Abstract
Endothelial–mesenchymal transition (EndMT) is considered one of the processes underlying tissue fibrosis by contributing to the pool of myofibroblasts. In the present study, we investigated the epigenetic mechanism whereby angiotensin II (Ang II) regulates EndMT to promote cardiac fibrosis focusing on the role of chromatin remodeling protein BRG1. BRG1 knockdown or inhibition attenuated Ang II-induced EndMT, as evidenced by down-regulation of CDH5, an endothelial marker, and up-regulation of COL1A2, a mesenchymal marker, in cultured vascular endothelial cells. On the one hand, BRG1 interacted with and was recruited by Sp1 to the SNAI2 (encoding SLUG) promoter to activate SNAI2 transcription in response to Ang II stimulation. Once activated, SLUG bound to the CDH5 promoter to repress CDH5 transcription. On the other hand, BRG1 interacted with and was recruited by SRF to the COL1A2 promoter to activate COL1A2 transcription. Mechanistically, BRG1 evicted histones from the target promoters to facilitate the bindings of Sp1 and SRF. Finally, endothelial conditional BRG1 knockout mice (CKO) exhibited a reduction in cardiac fibrosis, compared to the wild type (WT) littermates, in response to chronic Ang II infusion. In conclusion, our data demonstrate that BRG1 is a key transcriptional coordinator programming Ang II-induced EndMT to contribute to cardiac fibrosis.
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Affiliation(s)
- Zilong Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Xiaochen Kong
- Department of Endocrinology, Affiliated Nanjing Municipal Hospital of Nanjing Medical University, Nanjing, China
| | - Yuanyuan Zhang
- Hainan Provincial Key Laboratory for Tropical Cardiovascular Diseases Research and Key Laboratory of Emergency and Trauma of Ministry of Education, Institute of Cardiovascular Research of the First Affiliated Hospital, Hainan Medical University, Haikou, China
| | - Yangxi Zhang
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Liming Yu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Junli Guo
- Hainan Provincial Key Laboratory for Tropical Cardiovascular Diseases Research and Key Laboratory of Emergency and Trauma of Ministry of Education, Institute of Cardiovascular Research of the First Affiliated Hospital, Hainan Medical University, Haikou, China.
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China. .,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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19
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Yang Y, Yang G, Yu L, Lin L, Liu L, Fang M, Xu Y. An Interplay Between MRTF-A and the Histone Acetyltransferase TIP60 Mediates Hypoxia-Reoxygenation Induced iNOS Transcription in Macrophages. Front Cell Dev Biol 2020; 8:484. [PMID: 32626711 PMCID: PMC7315810 DOI: 10.3389/fcell.2020.00484] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Accepted: 05/22/2020] [Indexed: 01/23/2023] Open
Abstract
Cardiac ischemia-reperfusion injury (IRI) represents a major pathophysiological event associated with permanent loss of heart function. Several inter-dependent processes contribute to cardiac IRI that include accumulation of reactive oxygen species (ROS), aberrant inflammatory response, and depletion of energy supply. Inducible nitric oxide synthase (iNOS) is a pro-inflammatory mediator and a major catalyst of ROS generation. In the present study we investigated the epigenetic mechanism whereby iNOS transcription is up-regulated in macrophages in the context of cardiac IRI. We report that germline deletion or systemic inhibition of myocardin-related transcription factor A (MRTF-A) in mice attenuated up-regulation of iNOS following cardiac IRI in the heart. In cultured macrophages, depletion or inhibition of MRTF-A suppressed iNOS induction by hypoxia-reoxygenation (HR). In contrast, MRTF-A over-expression potentiated activation of the iNOS promoter by HR. MRTF-A directly binds to the iNOS promoter in response to HR stimulation. MRTF-A binding to the iNOS promoter was synonymous with active histone modifications including trimethylated H3K4, acetylated H3K9, H3K27, and H4K16. Further analysis revealed that MRTF-A interacted with H4K16 acetyltransferase TIP60 to synergistically activate iNOS transcription. TIP60 depletion or inhibition achieved equivalent effects as MRTF-A depletion/inhibition in terms of iNOS repression. Of interest, TIP60 appeared to form a crosstalk with the H3K4 trimethyltransferase complex to promote iNOS trans-activation. In conclusion, we data suggest that the MRTF-A-TIP60 axis may play a critical role in iNOS transcription in macrophages and as such be considered as a potential target for the intervention of cardiac IRI.
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Affiliation(s)
- Yuyu Yang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,Key Laboratory of Emergency and Trauma of Ministry of Education, Institute of Cardiovascular Research of the First Affiliated Hospital, Hainan Medical University, Haikou, China
| | - Guang Yang
- Department of Pathology, Soochow Municipal Hospital Affiliated with Nanjing Medical University, Soochow, China
| | - Liming Yu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Ling Lin
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Li Liu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Mingming Fang
- Center for Experimental Medicine, Jiangsu Health Vocational College, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Yong Xu
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
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20
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Fan Z, Kong M, Li M, Hong W, Fan X, Xu Y. Brahma Related Gene 1 (Brg1) Regulates Cellular Cholesterol Synthesis by Acting as a Co-factor for SREBP2. Front Cell Dev Biol 2020; 8:259. [PMID: 32500071 PMCID: PMC7243037 DOI: 10.3389/fcell.2020.00259] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 03/27/2020] [Indexed: 12/30/2022] Open
Abstract
Hepatocyte is a hub for cholesterol metabolism. Augmented synthesis of cholesterol in the liver is associated with hypercholesterolemia and contributes to the pathogenesis of a host of cardiovascular and metabolic diseases. Sterol response element binding protein 2 (SREBP2) regulates hepatic cholesterol metabolism by activating the transcription of rate-limiting enzymes in the cholesterol biosynthesis pathway. The underlying epigenetic mechanism is not well understood. We report here that mice with hepatocyte-specific knockout (CKO) of Brg1, a chromatin remodeling protein, exhibit reduced levels of hepatic cholesterol compared to the wild type (WT) littermates when placed on a high-fact diet (HFD) or a methionine-and-choline-deficient diet (MCD). Down-regulation of cholesterol levels as a result of BRG1 deficiency was accompanied by attenuation of cholesterogenic gene transcription. Likewise, BRG1 knockdown in hepatocytes markedly suppressed the induction of cholesterogenic genes by lipid depletion formulas. Brg1 interacted with SREBP2 and was recruited by SREBP2 to the cholesterogenic gene promoters. Reciprocally, Brg1 deficiency dampened the occupancies of SREBP2 on target promoters likely through modulating H3K9 methylation on the cholesterogenic gene promoters. Mechanistically, Brg1 recruited the H3K9 methyltransferase KDM3A to co-regulate pro-cholesterogenic transcription. KDM3A silencing dampened the cholesterogenic response in hepatocytes equivalent to Brg1 deficiency. In conclusion, our data demonstrate a novel epigenetic pathway that contributes to SREBP2-dependent cholesterol synthesis in hepatocytes.
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Affiliation(s)
- Zhiwen Fan
- Department of Pathology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, China
| | - Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Min Li
- Department of Clinical Medicine and Laboratory Center for Experimental Medicine, Jiangsu Health Vocational College, Nanjing, China
| | - Wenxuan Hong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xiangshan Fan
- Department of Pathology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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21
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Mao L, Liu L, Zhang T, Qin H, Wu X, Xu Y. Histone Deacetylase 11 Contributes to Renal Fibrosis by Repressing KLF15 Transcription. Front Cell Dev Biol 2020; 8:235. [PMID: 32363192 PMCID: PMC7180197 DOI: 10.3389/fcell.2020.00235] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 03/20/2020] [Indexed: 12/12/2022] Open
Abstract
Renal fibrosis represents a key pathophysiological process in patients with chronic kidney diseases (CKD) and is typically associated with a poor prognosis. Renal tubular epithelial cells (RTECs), in response to a host of pro-fibrogenic stimuli, can trans-differentiate into myofibroblast-like cells and produce extracellular matrix proteins to promote renal fibrosis. In the present study we investigated the role of histone deacetylase 11 (HDAC11) in this process and the underlying mechanism. We report that expression levels of HDAC11 were up-regulated in the kidneys in several different animal models of renal fibrosis. HDAC11 was also up-regulated by treatment of Angiotensin II (Ang II) in cultured RTECs. Consistently, pharmaceutical inhibition with a small-molecule inhibitor of HDAC11 (quisinostat) attenuated unilateral ureteral obstruction (UUO) induced renal fibrosis in mice. Similarly, HDAC11 inhibition by quisinostat or HDAC11 depletion by siRNA blocked Ang II induced pro-fibrogenic response in cultured RTECs. Mechanistically, HDAC11 interacted with activator protein 2 (AP-2α) to repress the transcription of Kruppel-like factor 15 (KLF15). In accordance, KLF15 knockdown antagonized the effect of HDAC11 inhibition or depletion and enabled Ang II to promote fibrogenesis in RTECs. Therefore, we data unveil a novel AP-2α-HDAC11-KLF15 axis that contributes to renal fibrosis.
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Affiliation(s)
- Lei Mao
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Li Liu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Tao Zhang
- Department of Geriatric Nephrology, Jiangsu Province Hospital, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Hao Qin
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xiaoyan Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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22
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Lv F, Li N, Kong M, Wu J, Fan Z, Miao D, Xu Y, Ye Q, Wang Y. CDKN2a/p16 Antagonizes Hepatic Stellate Cell Activation and Liver Fibrosis by Modulating ROS Levels. Front Cell Dev Biol 2020; 8:176. [PMID: 32266258 PMCID: PMC7105638 DOI: 10.3389/fcell.2020.00176] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 03/03/2020] [Indexed: 12/31/2022] Open
Abstract
The lipid-storage hepatic stellate cells (HSC) play as pivotal role in liver fibrosis being able to trans-differentiate into myofibroblasts in response to various pro-fibrogenic stimuli. In the present study we investigated the role of CDKN2a/p16, a negative regulator of cell cycling, in HSC activation and the underlying mechanism. Levels of p16 were significantly down-regulated in activated HSCs isolated from mice induced to develop liver fibrosis compared to quiescent HSCs isolated from the control mice ex vivo. There was a similar decrease in p16 expression in cultured HSCs undergoing spontaneous activation or exposed to TGF-β treatment in vitro. More important, p16 down-regulation was observed to correlate with cirrhosis in humans. In a classic model of carbon tetrachloride (CCl4) induced liver fibrosis, fibrogenesis was far more extensive in mice with p16 deficiency (KO) than the wild type (WT) littermates. Depletion of p16 in cultured HSCs promoted the synthesis of extracellular matrix (ECM) proteins. Mechanistically, p16 deficiency accelerated reactive oxygen species (ROS) generation in HSCs likely through the p38 MAPK signaling. P38 inhibition or ROS cleansing attenuated ECM production in p16 deficient HSCs. Taken together, our data unveil a previously unappreciated role for p16 in the regulation of HSC activation. Screening for small-molecule compounds that can boost p16 activity may yield novel therapeutic strategies against liver fibrosis.
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Affiliation(s)
- Fangqiao Lv
- Department of Cell Biology, Municipal Laboratory for Liver Protection and Regulation of Regeneration, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Nan Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Jun Wu
- Department of Anatomy, Nanjing Medical University, Nanjing, China
| | - Zhiwen Fan
- Department of Pathology, The Affiliated Drum Tower Hospital, Nanjing University Medical School, Nanjing, China
| | - Dengshun Miao
- Department of Anatomy, Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Qing Ye
- Department of Pathology, The Affiliated Drum Tower Hospital, Nanjing University Medical School, Nanjing, China
| | - Yutong Wang
- Department of Cell Biology, Municipal Laboratory for Liver Protection and Regulation of Regeneration, School of Basic Medical Sciences, Capital Medical University, Beijing, China
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Deacetylation of MRTF-A by SIRT1 defies senescence induced down-regulation of collagen type I in fibroblast cells. Biochim Biophys Acta Mol Basis Dis 2020; 1866:165723. [PMID: 32061777 DOI: 10.1016/j.bbadis.2020.165723] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 01/13/2020] [Accepted: 02/10/2020] [Indexed: 12/21/2022]
Abstract
Aging provokes both morphological and functional changes in cells, which are accompanied by a fundamental shift in gene expression patterns. One of the characteristic alterations associated with senescence in fibroblast cells is the down-regulation of collagen type I genes. In the present study, we investigated the contribution of myocardin-related transcription factor A, or MRTF-A, in this process. In mouse embryonic fibroblast (MEF) cells and human foreskin fibroblast (HFF) cells, senescence, induced by either progressive passage or treatment with hydrogen peroxide (H2O2), led to augmented lysine acetylation of MRTF-A paralleling down-regulation of collagen type I and SIRT1, a lysine deacetylase. SIRT1 interacted with MRTF-A to promote MRTF-A deacetylation. SIRT1 over-expression or activation by selective agonists enhanced trans-activation of the collagen promoters by MRTF-A. On the contrary, SIRT1 depletion or inhibition by specific antagonists suppressed trans-activation of the collagen promoters by MRTF-A. Likewise, mutation of four lysine residues within MRTF-A rendered it more potent in terms of activating the collagen promoters but unresponsive to SIRT1. Importantly, SIRT1 activation in senescent fibroblasts mitigated repression of collagen type I expression whereas SIRT1 inhibition promoted the loss of collagen type I expression prematurely in young fibroblasts. Mechanistically, SIRT1 enhanced the affinity of MRTF-A for the collagen type I promoters. In conclusion, our data unveil a novel mechanism that underscores aging-associated loss of collagen type I in fibroblasts via SIRT1-mediated post-translational modification of MRTF-A.
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Zheng Y, Cui B, Sun W, Wang S, Huang X, Gao H, Gao F, Cheng Q, Lu L, An Y, Li X, Sun N. Potential Crosstalk between Liver and Extra-liver Organs in Mouse Models of Acute Liver Injury. Int J Biol Sci 2020; 16:1166-1179. [PMID: 32174792 PMCID: PMC7053327 DOI: 10.7150/ijbs.41293] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 01/18/2020] [Indexed: 12/26/2022] Open
Abstract
Carbon tetrachloride (CCl4), Concanavalin A (ConA), bile duct ligation (BDL), and liver resection (LR) are four types of commonly used mouse models of acute liver injury. However, these four models belong to different types of liver cell damage while their application situations are often confounded. In addition, the systematic changes of multiple extra-liver organs after acute liver injury and the crosstalk between liver and extra-liver organs remain unclear. Here, we aim to map the morphological, metabolomic and transcriptomic changes systematically after acute liver injury and search for the potential crosstalk between the liver and the extra-liver organs. Significant changes of transcriptome were observed in multiple extra-liver organs after different types of acute liver injury despite dramatic morphological damage only occurred in lung tissues of the ConA/BDL models and spleen tissues in the ConA model. Liver transcriptomic changes initiated the serum metabolomic alterations which correlated to transcriptomic variation in lung, kidney, and brain tissues of BDL and LR models. The potential crosstalk might lead to pulmonary damage and development of hepatorenal syndrome (HRS) and hepatic encephalopathy (HE) during liver injury. Serum derived from acute liver injury mice damaged alveolar epithelial cells and human podocytes in vitro. Our data indicated that different types of acute liver injury led to different transcriptomic changes within extra-liver organs. Integration of serum metabolomics and transcriptomics from multiple tissues can improve our understanding of acute liver injury and its effect on the other organs.
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Affiliation(s)
- Yufan Zheng
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Baiping Cui
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Wenrui Sun
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Sining Wang
- Department of Pathology, School of Basic Medical Sciences, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Xu Huang
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Han Gao
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Fei Gao
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Qian Cheng
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Limin Lu
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Yanpeng An
- State Key Laboratory of Genetic Engineering, School of Life Sciences, Metabolomics and Systems Biology Laboratory, Human Phenome Institute, Fudan University, Shanghai 200433, China
| | - Xiaobo Li
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China
| | - Ning Sun
- Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China.,Department of Cardiology, Huashan Hospital, Fudan University, Shanghai 200032, China.,Department of Internal Medicine, Huashan Hospital West Campus, Fudan University, Shanghai 200032, China.,Shanghai Key Laboratory of Clinical Geriatric Medicine, Fudan University, Shanghai 200032, China
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25
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Wang(a) J, Wang S, Wang(b) J, Xiao M, Guo Y, Tang Y, Zhang J, Gu J. Epigenetic Regulation Associated With Sirtuin 1 in Complications of Diabetes Mellitus. Front Endocrinol (Lausanne) 2020; 11:598012. [PMID: 33537003 PMCID: PMC7848207 DOI: 10.3389/fendo.2020.598012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Accepted: 11/27/2020] [Indexed: 01/19/2023] Open
Abstract
Diabetes mellitus (DM) has been one of the largest health concerns of the 21st century due to the serious complications associated with the disease. Therefore, it is essential to investigate the pathogenesis of DM and develop novel strategies to reduce the burden of diabetic complications. Sirtuin 1 (SIRT1), a nicotinamide adenosine dinucleotide (NAD+)-dependent deacetylase, has been reported to not only deacetylate histones to modulate chromatin function but also deacetylate numerous transcription factors to regulate the expression of target genes, both positively and negatively. SIRT1 also plays a crucial role in regulating histone and DNA methylation through the recruitment of other nuclear enzymes to the chromatin. Furthermore, SIRT1 has been verified as a direct target of many microRNAs (miRNAs). Recently, numerous studies have explored the key roles of SIRT1 and other related epigenetic mechanisms in diabetic complications. Thus, this review aims to present a summary of the rapidly growing field of epigenetic regulatory mechanisms, as well as the epigenetic influence of SIRT1 on the development and progression of diabetic complications, including cardiomyopathy, nephropathy, and retinopathy.
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Affiliation(s)
- Jie Wang(a)
- School of Nursing, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Shudong Wang
- Department of Cardiology at the First Hospital of Jilin University, Changchun, China
| | - Jie Wang(b)
- School of Nursing, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Mengjie Xiao
- School of Nursing, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yuanfang Guo
- School of Nursing, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yufeng Tang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Shandong First Medical University, Jinan, China
| | - Jingjing Zhang
- Department of Cardiology at the First Hospital of China Medical University, and Department of Cardiology at the People’s Hospital of Liaoning Province, Shenyang, China
| | - Junlian Gu
- School of Nursing, Cheeloo College of Medicine, Shandong University, Jinan, China
- *Correspondence: Junlian Gu,
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26
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Yang YX, Shen HH, Cao F, Xie LY, Zhu GL, Sam NB, Wang DG, Pan HF. Therapeutic potential of enhancer of zeste homolog 2 in autoimmune diseases. Expert Opin Ther Targets 2019; 23:1015-1030. [PMID: 31747802 DOI: 10.1080/14728222.2019.1696309] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Introduction: Autoimmune diseases (ADs) are idiopathic and heterogeneous disorders with contentious pathophysiology. Great strides have been made in epigenetics and its involvement in ADs. Zeste homolog 2 (EZH2) has sparked extensive interest because of its pleiotropic roles in distinct pathologic contexts.Areas covered: This review summarizes the epigenetic functions and the biological significance of EZH2 in the etiology of rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), type 1 diabetes (T1D), inflammatory bowel disease (IBD), multiple sclerosis (MS), and systemic sclerosis (SSc). A brief recapitulation of the therapeutic potential of EZH2 targeting is provided.Expert opinion: There are questions marks and controversies surrounding the feasibility and safety of EZH2 targeting; it is recommended in RA and SLE, but queried in T1D, IBD, MS, and SSc. Future work should focus on contrast studies, systematic analyses and preclinical studies with optimizing methodologies. Selective research studies conducted in a stage-dependent manner are necessary because of the relapsing-remitting clinical paradigms.
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Affiliation(s)
- Yue-Xin Yang
- Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Hui-Hui Shen
- Department of Clinical Medicine, The second School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Fan Cao
- Department of Clinical Medicine, The second School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Liang-Yu Xie
- Department of Clinical Medicine, The second School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Guang-Lin Zhu
- Department of Clinical Medicine, The second School of Clinical Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Napoleon Bellua Sam
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Anhui Province Key Laboratory of Major Autoimmune Diseases, Hefei, Anhui, China
| | - De-Guang Wang
- Department of Nephrology, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Hai-Feng Pan
- Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Anhui Province Key Laboratory of Major Autoimmune Diseases, Hefei, Anhui, China
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27
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MKL1 promotes endothelial-to-mesenchymal transition and liver fibrosis by activating TWIST1 transcription. Cell Death Dis 2019; 10:899. [PMID: 31776330 PMCID: PMC6881349 DOI: 10.1038/s41419-019-2101-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 10/21/2019] [Accepted: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Excessive fibrogenic response in the liver disrupts normal hepatic anatomy and function heralding such end-stage liver diseases as hepatocellular carcinoma and cirrhosis. Sinusoidal endothelial cells contribute to myofibroblast activation and liver fibrosis by undergoing endothelial-mesenchymal transition (EndMT). The underlying mechanism remains poorly defined. Here we report that inhibition or endothelial-specific deletion of MKL1, a transcriptional modulator, attenuated liver fibrosis in mice. MKL1 inhibition or deletion suppressed EndMT induced by TGF-β. Mechanistically, MKL1 was recruited to the promoter region of TWIST1, a master regulator of EndMT, and activated TWIST1 transcription in a STAT3-dependent manner. A small-molecule STAT3 inhibitor (C188-9) alleviated EndMT in cultured cells and bile duct ligation (BDL) induced liver fibrosis in mice. Finally, direct inhibition of TWIST1 by a small-molecule compound harmine was paralleled by blockade of EndMT in cultured cells and liver fibrosis in mice. In conclusion, our data unveil a novel mechanism underlying EndMT and liver fibrosis and highlight the possibility of targeting the STAT3-MKL1-TWIST1 axis in the intervention of aberrant liver fibrogenesis.
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28
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Li Z, Lv F, Dai C, Wang Q, Jiang C, Fang M, Xu Y. Activation of Galectin-3 (LGALS3) Transcription by Injurious Stimuli in the Liver Is Commonly Mediated by BRG1. Front Cell Dev Biol 2019; 7:310. [PMID: 31850346 PMCID: PMC6901944 DOI: 10.3389/fcell.2019.00310] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 11/13/2019] [Indexed: 01/13/2023] Open
Abstract
Galectin-3 (encoded by LGALS3) is a glycan-binding protein that regulates a diverse range of pathophysiological processes contributing to the pathogenesis of human diseases. Previous studies have found that galectin-3 levels are up-regulated in the liver by a host of different injurious stimuli. The underlying epigenetic mechanism, however, is unclear. Here we report that conditional knockout of Brahma related gene (BRG1), a chromatin remodeling protein, in hepatocytes attenuated induction of galectin-3 expression in several different animal models of liver injury. Similarly, BRG1 depletion or pharmaceutical inhibition in cultured hepatocytes suppressed the induction of galectin-3 expression by treatment with LPS plus free fatty acid (palmitate). Further analysis revealed that BRG1 interacted with AP-1 to bind to the proximal galectin-3 promoter and activate transcription. Mechanistically, DNA demethylation surrounding the galectin-3 promoter appeared to be a rate-limiting step in BRG1-mediated activation of galectin-3 transcription. BRG1 recruited the DNA 5-methylcytosine dioxygenase TET1 to the galectin-3 to promote active DNA demethylation thereby activating galectin-3 transcription. Finally, TET1 silencing abrogated induction of galectin-3 expression by LPS plus palmitate in cultured hepatocytes. In conclusion, our data unveil a novel epigenetic pathway that contributes to injury-associated activation of galectin-3 transcription in hepatocytes.
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Affiliation(s)
- Zilong Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Fangqiao Lv
- Department of Cell Biology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Congxin Dai
- Department of Neurosurgery, Peking Union Medical College Hospital, Beijing, China
| | - Qiong Wang
- Department of Surgical Oncology, the Affiliated Hospital of Nanjing University of Chinese Medicine, Jiangsu Province Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Chao Jiang
- Department of Surgical Oncology, the Affiliated Hospital of Nanjing University of Chinese Medicine, Jiangsu Province Hospital of Traditional Chinese Medicine, Nanjing, China
| | - Mingming Fang
- Department of Clinical Medicine, Laboratory Center for Basic Medical Sciences, Jiangsu Health Vocational College, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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29
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Li Z, Xia J, Fang M, Xu Y. Epigenetic regulation of lung cancer cell proliferation and migration by the chromatin remodeling protein BRG1. Oncogenesis 2019; 8:66. [PMID: 31695026 PMCID: PMC6834663 DOI: 10.1038/s41389-019-0174-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 10/14/2019] [Accepted: 10/15/2019] [Indexed: 01/10/2023] Open
Abstract
Malignant lung cancer cells are characterized by uncontrolled proliferation and migration. Aberrant lung cancer cell proliferation and migration are programmed by altered cancer transcriptome. The underlying epigenetic mechanism is unclear. Here we report that expression levels of BRG1, a chromatin remodeling protein, were significantly up-regulated in human lung cancer biopsy specimens of higher malignancy grades compared to those of lower grades. Small interfering RNA mediated depletion or pharmaceutical inhibition of BRG1 suppressed proliferation and migration of lung cancer cells. BRG1 depletion or inhibition was paralleled by down-regulation of cyclin B1 (CCNB1) and latent TGF-β binding protein 2 (LTBP2) in lung cancer cells. Further analysis revealed that BRG1 directly bound to the CCNB1 promoter to activate transcription in response to hypoxia stimulation by interacting with E2F1. On the other hand, BRG1 interacted with Sp1 to activate LTBP2 transcription. Mechanistically, BRG1 regulated CCNB1 and LTBP2 transcription by altering histone modifications on target promoters. Specifically, BRG1 recruited KDM3A, a histone H3K9 demethylase, to remove dimethyl H3K9 from target gene promoters thereby activating transcription. KDM3A knockdown achieved equivalent effects as BRG1 silencing by diminishing lung cancer proliferation and migration. Of interest, BRG1 directly activated KDM3A transcription by forming a complex with HIF-1α. In conclusion, our data unveil a novel epigenetic mechanism whereby malignant lung cancer cells acquired heightened ability to proliferate and migrate. Targeting BRG1 may yield effective interventional strategies against malignant lung cancers.
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Affiliation(s)
- Zilong Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Jun Xia
- Department of Respiratory Medicine, The Affiliated Hospital of Nanjing University of Chinese Medicine, Jiangsu Province Hospital of Traditional Chinese Medicine, Nanjing, China.
| | - Mingming Fang
- Department of Clinical Medicine and Laboratory Center for Experimental Medicine, Jiangsu Health Vocational College, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China. .,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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30
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Mao L, Liu L, Zhang T, Wu X, Zhang T, Xu Y. MKL1 mediates TGF-β-induced CTGF transcription to promote renal fibrosis. J Cell Physiol 2019; 235:4790-4803. [PMID: 31637729 DOI: 10.1002/jcp.29356] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 09/30/2019] [Indexed: 12/20/2022]
Abstract
Aberrant fibrogenesis impairs the architectural and functional homeostasis of the kidneys. It also predicts poor diagnosis in patients with end-stage renal disease (ESRD). Renal tubular epithelial cells (RTEC) can trans-differentiate into myofibroblasts to produce extracellular matrix proteins and contribute to renal fibrosis. Connective tissue growth factor (CTGF) is a cytokine upregulated in RTECs during renal fibrosis. In the present study, we investigated the regulation of CTGF transcription by megakaryocytic leukemia 1 (MKL1). Genetic deletion or pharmaceutical inhibition of MKL1 in mice mitigated renal fibrosis following the unilateral ureteral obstruction procedure. Notably, MKL1 deficiency in mice downregulated CTGF expression in the kidneys. Likewise, MKL1 knockdown or inhibition in RTEs blunted TGF-β induced CTGF expression. Further, it was discovered that MKL1 bound directly to the CTGF promoter by interacting with SMAD3 to activate CTGF transcription. In addition, MKL1 mediated the interplay between p300 and WDR5 to regulate CTGF transcription. CTGF knockdown dampened TGF-β induced pro-fibrogenic response in RTEs. MKL1 activity was reciprocally regulated by CTGF. In conclusion, we propose that targeting the MKL1-CTGF axis may generate novel therapeutic solutions against aberrant renal fibrogenesis.
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Affiliation(s)
- Lei Mao
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Nanjing Medical University, Nanjing, China
| | - Li Liu
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Nanjing Medical University, Nanjing, China
| | - Tianyi Zhang
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Nanjing Medical University, Nanjing, China
| | - Xiaoyan Wu
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Nanjing Medical University, Nanjing, China.,The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Tao Zhang
- Department of Geriatric Nephrology, Jiangsu Province Hospital, First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Department of Pathophysiology, Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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31
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Shao J, Xu Y, Fang M. BRG1 deficiency in endothelial cells alleviates thioacetamide induced liver fibrosis in mice. Biochem Biophys Res Commun 2019; 521:212-219. [PMID: 31635808 DOI: 10.1016/j.bbrc.2019.10.109] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 10/12/2019] [Indexed: 12/11/2022]
Abstract
Liver sinusoidal endothelial cells play a key role maintaining the hepatic homeostasis, the disruption of which is associated with such end-stage liver diseases as hepatocellular carcinoma and cirrhosis. In the present study we investigated the role of brahma-related gene 1 (BRG1), a chromatin remodeling protein, in regulating endothelial transcription and the implication in liver fibrosis. We report that endothelial-specific deletion of BRG1 in mice attenuated liver fibrosis induced by injection with thioacetamide (TAA). Coincidently, alleviation of liver fibrosis as a result of endothelial BRG1 deletion was accompanied by an up-regulation of eNOS activity and NO bioavailability. In cultured endothelial cells, exposure to lipopolysaccharide (LPS) suppressed eNOS activity whereas BRG1 depletion with small interfering RNA restored eNOS-dependent NO production. Further analysis revealed that BRG1 was recruited to the caveolin-1 (CAV1) promoter by Sp1 and activated transcription of CAV1, which in turn inhibited eNOS activity. Mechanistically, BRG1 interacted with the H3K4 trimethyltransferase MLL1 to modulate H3K4 trimethylation surrounding the CAV1 promoter thereby contributing to LPS-induced CAV1 activation. In conclusion, our data unveil a novel role for BRG1 in the regulation of endothelial function and liver fibrosis.
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Affiliation(s)
- Jing Shao
- Wuxi School of Medicine, Jiangnan University, Wuxi, China
| | - Yong Xu
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Mingming Fang
- Department of Clinical Medicine and Center for Experimental Medicine, Jiangsu Health Vocational College, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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32
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Lu Y, Lv F, Kong M, Chen X, Duan Y, Chen X, Sun D, Fang M, Xu Y. A cAbl-MRTF-A Feedback Loop Contributes to Hepatic Stellate Cell Activation. Front Cell Dev Biol 2019; 7:243. [PMID: 31681772 PMCID: PMC6805704 DOI: 10.3389/fcell.2019.00243] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 10/03/2019] [Indexed: 12/13/2022] Open
Abstract
Trans-differentiation of quiescent hepatic stellate cells (HSC) to myofibroblasts is a hallmark event in liver fibrosis. Previous studies have led to the discovery that myocardin-related transcription factor A (MRTF-A) is a key regulator of HSC trans-differentiation or, activation. In the present study we investigated the interplay between MRTF-A and c-Abl (encoded by Abl1), a tyrosine kinase, in this process. We report that hepatic expression levels of c-Abl were down-regulated in MRTF-A knockout (KO) mice compared to wild type (WT) littermates in several different models of liver fibrosis. MRTF-A deficiency also resulted in c-Abl down-regulation in freshly isolated HSCs from the fibrotic livers of mice. MRTF-A knockdown or inhibition repressed c-Abl in cultured HSCs in vitro. Further analyses revealed that MRTF-A directly bound to the Abl1 promoter to activate transcription by interacting with Sp1. Reciprocally, pharmaceutical inhibition of c-Abl suppressed MRTF-A activity. Mechanistically, c-Abl activated extracellular signal-regulated kinase (ERK), which in turn phosphorylated MRTF-A and promoted MRTF-A nuclear trans-localization. In conclusion, our data suggest that a c-Abl-MRTF-A positive feedback loop contributes to HSC activation and liver fibrosis.
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Affiliation(s)
- Yunjie Lu
- Department of Hepatobiliary and Pancreatic Surgery, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Fangqiao Lv
- Department of Cell Biology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xuyang Chen
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yunfei Duan
- Department of Hepatobiliary and Pancreatic Surgery, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Xuemin Chen
- Department of Hepatobiliary and Pancreatic Surgery, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Donglin Sun
- Department of Hepatobiliary and Pancreatic Surgery, The First People's Hospital of Changzhou, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Mingming Fang
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China.,Department of Clinical Medicine and Laboratory Center for Experimental Medicine, Jiangsu Vocational College of Medicine, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.,Institute of Biomedical Research, Liaocheng University, Liaocheng, China
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33
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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.
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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
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34
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Ramteke P, Deb A, Shepal V, Bhat MK. Hyperglycemia Associated Metabolic and Molecular Alterations in Cancer Risk, Progression, Treatment, and Mortality. Cancers (Basel) 2019; 11:E1402. [PMID: 31546918 PMCID: PMC6770430 DOI: 10.3390/cancers11091402] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/15/2019] [Accepted: 08/20/2019] [Indexed: 12/12/2022] Open
Abstract
Cancer and diabetes are amongst the leading causes of deaths worldwide. There is an alarming rise in cancer incidences and mortality, with approximately 18.1 million new cases and 9.6 million deaths in 2018. A major contributory but neglected factor for risk of neoplastic transformation is hyperglycemia. Epidemiologically too, lifestyle patterns resulting in high blood glucose level, with or without the role of insulin, are more often correlated with cancer risk, progression, and mortality. The two conditions recurrently exist in comorbidity, and their interplay has rendered treatment regimens more challenging by restricting the choice of drugs, affecting surgical consequences, and having associated fatal complications. Limited comprehensive literature is available on their correlation, and a lack of clarity in understanding in such comorbid conditions contributes to higher mortality rates. Hence, a critical analysis of the elements responsible for enhanced mortality due to hyperglycemia-cancer concomitance is warranted. Given the lifestyle changes in the human population, increasing metabolic disorders, and glucose addiction of cancer cells, hyperglycemia related complications in cancer underline the necessity for further in-depth investigations. This review, therefore, attempts to shed light upon hyperglycemia associated factors in the risk, progression, mortality, and treatment of cancer to highlight important mechanisms and potential therapeutic targets.
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Affiliation(s)
- Pranay Ramteke
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Ankita Deb
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Varsha Shepal
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
| | - Manoj Kumar Bhat
- National Centre for Cell Science, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007, India.
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35
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Liu L, Mao L, Wu X, Wu T, Liu W, Yang Y, Zhang T, Xu Y. BRG1 regulates endothelial-derived IL-33 to promote ischemia-reperfusion induced renal injury and fibrosis in mice. Biochim Biophys Acta Mol Basis Dis 2019; 1865:2551-2561. [DOI: 10.1016/j.bbadis.2019.06.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 05/30/2019] [Accepted: 06/17/2019] [Indexed: 02/07/2023]
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36
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Kong M, Hong W, Shao Y, Lv F, Fan Z, Li P, Xu Y, Guo J. Ablation of serum response factor in hepatic stellate cells attenuates liver fibrosis. J Mol Med (Berl) 2019; 97:1521-1533. [PMID: 31435710 DOI: 10.1007/s00109-019-01831-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 07/19/2019] [Accepted: 08/13/2019] [Indexed: 12/20/2022]
Abstract
Trans-differentiation, or activation, of hepatic stellate cells (HSCs) is a hallmark event in liver fibrosis although the underlying mechanism is not fully appreciated. Serum response factor (SRF) is a pleiotropic sequence-specific transcription factor with a ubiquitous expression pattern. In the present study, we investigated the effect of HSC-specific ablation of SRF on liver fibrosis in vivo and the underlying mechanism. We report that SRF bound to the promoter regions of pro-fibrogenic genes, including collagen type I (Col1a1/Col1a2) and alpha smooth muscle actin (Acta2), with greater affinity in activated HSCs compared to quiescent HSCs. Ablation of SRF in HSCs in vitro downregulated the expression of fibrogenic genes by dampening the accumulation of active histone marks. SRF also interacted with MRTF-A, a well-documented co-factor involved in liver fibrosis, on the pro-fibrogenic gene promoters during HSC activation. In addition, SRF directly regulated MRTF-A transcription in activated HSCs. More importantly, HSC conditional SRF knockout (CKO) mice developed a less robust pro-fibrogenic response in the liver in response to CCl4 injection and BDL compared to wild-type littermates. In conclusion, our data demonstrate that SRF may play an essential role in HSC activation and liver fibrosis. KEY MESSAGES: • SRF deficiency decelerates activation of hepatic stellate cells (HSCs) in vitro. • SRF epigenetically activates pro-fibrogenic transcription to promote HSC maturation. • SRF interacts with MRTF-A and contributes to MRTF-A transcription. • Conditional SRF deletion in HSCs attenuates BDL-induced liver fibrosis in mice. • Conditional SRF ablation in HSCs attenuates CCl4-induced liver fibrosis in mice.
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Affiliation(s)
- Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, 211166, China
| | - Wenxuan Hong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, 211166, China
| | - Yang Shao
- Cardiovascular Disease and Research Institute, Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Fangqiao Lv
- Department of Cell Biology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Zhiwen Fan
- Department of Pathology, Affiliated Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing, China
| | - Ping Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, 211166, China. .,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, 211166, China. .,Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
| | - Junli Guo
- Cardiovascular Disease and Research Institute, Affiliated Hospital of Hainan Medical University, Haikou, China.
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Kong M, Chen X, Lv F, Ren H, Fan Z, Qin H, Yu L, Shi X, Xu Y. Serum response factor (SRF) promotes ROS generation and hepatic stellate cell activation by epigenetically stimulating NCF1/2 transcription. Redox Biol 2019; 26:101302. [PMID: 31442911 PMCID: PMC6831835 DOI: 10.1016/j.redox.2019.101302] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/13/2019] [Accepted: 08/15/2019] [Indexed: 12/25/2022] Open
Abstract
Activation of hepatic stellate cells (HSC) is a hallmark event in liver fibrosis. Accumulation of reactive oxygen species (ROS) serves as a driving force for HSC activation. The regulatory subunits of the NOX complex, NCF1 (p47phox) and NCF2 (p67phox), are up-regulated during HSC activation contributing to ROS production and liver fibrosis. The transcriptional mechanism underlying NCF1/2 up-regulation is not clear. In the present study we investigated the role of serum response factor (SRF) in HSC activation focusing on the transcriptional regulation of NCF1/2. We report that compared to wild type littermates HSC-conditional SRF knockout (CKO) mice exhibited a mortified phenotype of liver fibrosis induced by thioacetamide (TAA) injection or feeding with a methionine-and-choline deficient diet (MCD). More importantly, SRF deletion attenuated ROS levels in HSCs in vivo. Similarly, SRF knockdown in cultured HSCs suppressed ROS production in vitro. Further analysis revealed that SRF deficiency resulted in repression of NCF1/NCF2 expression. Mechanistically, SRF regulated epigenetic transcriptional activation of NCF1/NCF2 by interacting with and recruiting the histone acetyltransferase KAT8 during HSC activation. In conclusion, we propose that SRF integrates transcriptional activation of NCF1/NCF2 and ROS production to promote liver fibrosis.
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Affiliation(s)
- Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Xuyang Chen
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Fangqiao Lv
- Department of Cell Biology and the Municipal Laboratory of Liver Protection and Regulation of Regeneration, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Haozhen Ren
- Department of Hepato-biliary Surgery and Department of Pathology, Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Zhiwen Fan
- Department of Hepato-biliary Surgery and Department of Pathology, Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Hao Qin
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Liming Yu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Xiaolei Shi
- Department of Hepato-biliary Surgery and Department of Pathology, Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing, China.
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Disease Translational Medicine, Department of Pathophysiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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38
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Liu DW, Zhang JH, Liu FX, Wang XT, Pan SK, Jiang DK, Zhao ZH, Liu ZS. Silencing of long noncoding RNA PVT1 inhibits podocyte damage and apoptosis in diabetic nephropathy by upregulating FOXA1. Exp Mol Med 2019; 51:1-15. [PMID: 31371698 PMCID: PMC6802617 DOI: 10.1038/s12276-019-0259-6] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 01/14/2019] [Accepted: 02/18/2019] [Indexed: 12/18/2022] Open
Abstract
The number of patients with diabetic nephropathy (DN) is still on the rise worldwide, and this requires the development of new therapeutic strategies. Recent reports have highlighted genetic factors in the treatment of DN. Herein, we aimed to study the roles of long noncoding RNA (lncRNA) plasmacytoma variant translocation 1 (PVT1) and histone 3 lysine 27 trimethylation (H3K27me3) in DN. A model of DN was established by inducing diabetes in mice with streptozotocin. Mouse podocyte clone 5 (MPC5) podocytes and primary podocytes were cultured in normal and high glucose media to observe cell morphology and to quantify PVT1 expression. The roles of PVT1 and enhancer of zeste homolog 2 (EZH2) were validated via loss-of-function and gain-of-function in vitro experiments to identify the interactions among PVT1, EZH2, and forkhead box A1 (FOXA1). The podocyte damage and apoptosis due to PVT1 and FOXA1 were verified with in vivo experiments. PVT1 was highly expressed in MPC5 and primary podocytes in DN patients and in cultures grown in high glucose medium. A large number of CpG (C-phosphate-G) island sites were predicted at the FOXA1 promoter region, where PVT1 recruited EZH2 to promote the recruitment of H3K27me3. The silencing of PVT1 or the overexpression of FOXA1 relieved the damage and inhibited the apoptosis of podocytes in DN, as was evidenced by the upregulated expression of synaptopodin and podocin, higher expression of Bcl-2, and lower expression of Bax and cleaved caspase-3. The key findings of this study collectively indicate that the suppression of lncRNA PVT1 exerts inhibitory effects on podocyte damage and apoptosis via FOXA1 in DN, which is of clinical significance. Targeting an RNA molecule responsible for disrupting metabolic protein levels in diabetic kidney disease may improve treatment. Diabetic nephropathy (DN) can affect people with type I or type II diabetes, and results in functional deterioration and the need for regular dialysis. DN incidence is rising worldwide, but existing treatments are only partially effective. Zhang-Suo Liu at Zhengzhou University, China, and co-workers examined the role of a long noncoding RNA molecule known as PVT1, which has been recently associated with kidney disease. The team collected serum samples from 32 patients with DN, and also generated a DN mouse model. They found that PVT1 expression was significantly higher in DN, and that this inhibited the expression of a key metabolic protein, FOXA1. Silencing PVT1 restored FOXA1 levels, limiting damage and cell death in kidney cells.
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Affiliation(s)
- Dong-Wei Liu
- Department of Nephrology, The First Affiliated Hospital of Zhengzhou University, 450052, Zhengzhou, China.,Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Jia-Hui Zhang
- Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Feng-Xun Liu
- Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Xu-Tong Wang
- Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Shao-Kang Pan
- Department of Nephrology, The First Affiliated Hospital of Zhengzhou University, 450052, Zhengzhou, China.,Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Deng-Ke Jiang
- Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Zi-Hao Zhao
- Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China.,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China.,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China
| | - Zhang-Suo Liu
- Department of Nephrology, The First Affiliated Hospital of Zhengzhou University, 450052, Zhengzhou, China. .,Research Institute of Nephrology, Zhengzhou University, 450052, Zhengzhou, China. .,Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, 450052, Zhengzhou, China. .,Core Unit of National Clinical Medical Research Center of Kidney Disease, 450052, Zhengzhou, China.
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Fan Z, Li N, Xu Z, Wu J, Fan X, Xu Y. An interaction between MKL1, BRG1, and C/EBPβ mediates palmitate induced CRP transcription in hepatocytes. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2019; 1862:194412. [PMID: 31356989 DOI: 10.1016/j.bbagrm.2019.194412] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 07/22/2019] [Accepted: 07/23/2019] [Indexed: 12/11/2022]
Abstract
Non-alcoholic steatohepatitis (NASH) is one of the most predominant disorders in metabolic syndrome. Induction of pro-inflammatory mediators in hepatocytes exposed to free fatty acids represents a hallmark event during NASH pathogenesis. C-reactive protein (CRP) is a prototypical pro-inflammatory mediator. In the present study, we investigated the mechanism by which megakaryocytic leukemia 1 (MKL1) mediates palmitate (PA) induced CRP transcription in hepatocytes. We report that over-expression of MKL1, but not MKL2, activated the CRP promoter whereas depletion or inhibition of MKL1 repressed the CRP promoter. MKL1 potentiated the induction of the CRP promoter activity by PA treatment. Importantly, MKL1 knockdown by siRNA or pharmaceutical inhibition by CCG-1423 attenuated the induction of endogenous CRP expression in hepatocytes. Similarly, primary hepatocytes isolated from wild type (WT) mice produced more CRP than those isolated from MKL1 deficient (KO) mice when stimulated with PA. Mechanistically, the sequence-specific transcription factor CCAAT-enhancer-binding protein (C/EBPβ) interacted with MKL1 and recruited MKL1 to activate CRP transcription. Reciprocally, MKL1 modulated C/EBPβ activity by recruiting the chromatin remodeling protein BRG1 to the CRP promoter to alter histone modifications. In conclusion, our data delineate a novel epigenetic mechanism underlying augmented hepatic inflammation during NASH pathogenesis.
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Affiliation(s)
- Zhiwen Fan
- Department of Pathology, Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Nan Li
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Zheng Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Jiahao Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Xiangshan Fan
- Department of Pathology, Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing, China.
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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40
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Liu L, Mao L, Xu Y, Wu X. Endothelial-specific deletion of Brahma-related gene 1 (BRG1) assuages unilateral ureteral obstruction induced renal injury in mice. Biochem Biophys Res Commun 2019; 517:244-252. [PMID: 31349970 DOI: 10.1016/j.bbrc.2019.07.077] [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: 07/06/2019] [Accepted: 07/20/2019] [Indexed: 02/07/2023]
Abstract
Renal homeostasis is regulated by the interplay among different cell types in the kidneys including endothelial cells. In the present study we investigated the phenotypic regulation of endothelial cells by BRG1, a chromatin remodeling protein, in a mouse model of obstructive nephropathy (ON). We report that endothelial-specific deletion of BRG1 attenuated renal inflammation induced by unilateral ureteral tract obstruction (UUO) in mice, as evidenced by down-regulation of pro-inflammatory cytokines and diminished infiltration of immune cells. Moreover, endothelial BRG1 deficiency suppressed UUO-induced renal fibrosis in mice as measured by expression of pro-fibrogenic genes, picrosirius red staining of collagenous tissues, and quantification of hydroxylproline levels. Mechanistically, BRG1 activated the transcription of adhesion molecules and chemokines in endothelial cells by recruiting histone modifying enzymes leading to macrophage adhesion and chemotaxis. In conclusion, we propose that epigenetic regulation of endothelial function by BRG1 may play an active role in ON pathogenesis.
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Affiliation(s)
- Li Liu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Lei Mao
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Xiaoyan Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, China.
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41
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A non-autonomous role of MKL1 in the activation of hepatic stellate cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2019; 1862:609-618. [DOI: 10.1016/j.bbagrm.2019.03.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/07/2019] [Accepted: 03/30/2019] [Indexed: 01/20/2023]
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42
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Yang Y, Liu L, Li M, Cheng X, Fang M, Zeng Q, Xu Y. The chromatin remodeling protein BRG1 links ELOVL3 trans-activation to prostate cancer metastasis. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2019; 1862:834-845. [PMID: 31154107 DOI: 10.1016/j.bbagrm.2019.05.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 05/20/2019] [Accepted: 05/25/2019] [Indexed: 10/26/2022]
Abstract
Prostate cancer malignancies are intimately correlated with deregulated fatty acid metabolism. The underlying epigenetic mechanism is not fully understood. In the present study we investigated the mechanism whereby the chromatin remodeling protein BRG1 regulates the transcription of long-chain fatty acid elongase 3 (Elovl3) in prostate cancer cells. We report that in response to pro-metastatic cues (androgen and TGF-β) BRG1 expression was up-regulated along with Elvol3 in prostate cancer cells. BRG1 over-expression potentiated whereas BRG1 knockdown attenuated prostate cancer cell migration and invasion. Coincidently, Elovl3 was up-regulated following BRG1 over-expression and down-regulated after BRG1 knockdown in prostate cancer cells. Further analysis revealed that BRG1 interacted with and was recruited by retinoic acid receptor-related orphan receptor (RORγ) to the Elovl3 promoter to activate transcription. Chromatin immunoprecipitation (ChIP) profiling demonstrated that BRG1 interacted with histone acetyltransferase p300 to activate Elovl3 transcription. Depletion of p300 by siRNA or inhibition of p300 by curcumin attenuated Elovl3 trans-activation in prostate cancer cells. Together, our data identify a novel epigenetic pathway that links Elovl3 transcription to prostate cancer cell migration and invasion.
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Affiliation(s)
- Yuyu Yang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China
| | - Li Liu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Min Li
- Center for Male Reproductive Medicine, Department of Clinical Medicine, Jiangsu Health Vocational College, Nanjing, China
| | - Xian Cheng
- Jiangsu Institute of Nuclear Medicine, Wuxi, China
| | - Mingming Fang
- Center for Male Reproductive Medicine, Department of Clinical Medicine, Jiangsu Health Vocational College, Nanjing, China
| | - Qingqi Zeng
- Center for Male Reproductive Medicine, Department of Clinical Medicine, Jiangsu Health Vocational College, Nanjing, China.
| | - Yong Xu
- Institute of Biomedical Research, Liaocheng University, Liaocheng, China; Key Laboratory of Targeted Intervention of Cardiovascular Disease, Collaborative Innovation Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
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43
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Kong M, Wu J, Fan Z, Chen B, Wu T, Xu Y. The histone demethylase Kdm4 suppresses activation of hepatic stellate cell by inducing MiR-29 transcription. Biochem Biophys Res Commun 2019; 514:16-23. [PMID: 31014673 DOI: 10.1016/j.bbrc.2019.04.105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 04/14/2019] [Indexed: 12/21/2022]
Abstract
One of the hallmark events during liver fibrosis is the transition of quiescent hepatic stellate cells (HSC) into activated myofibroblasts, which are responsible for the production and deposition of pro-fibrogenic proteins. The epigenetic mechanism underlying HSC trans-differentiation is not fully understood. In the present study we investigated the contribution of histone H3K9 demethylase KDM4 in this process. We report that expression levels of KDM4 were down-regulated during HSC activation paralleling the up-regulation of alpha smooth muscle cell actin (Acta2), a marker of mature myofibroblast. Furthermore, HSCs isolated from mice induced to develop liver fibrosis exhibit lowered KDM4 expression compared to the control mice. In accordance, KDM4 depletion with siRNA accelerated HSC activation. Of interest, the loss of KDM4 was mirrored by the repression of miR-29, an antagonist of liver fibrosis, during HSC activation both in vitro and in vivo. KDM4 knockdown resulted in the down-regulation of miR-29 expression. Mechanistically, the sequence-specific transcription factor SREBP2 interacted with KDM4 to activate miR-29 transcription. In conclusion, our data delineate a novel epigenetic mechanism underlying HSC activation. Targeting this axis may yield potential therapeutics against liver fibrosis.
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Affiliation(s)
- Ming Kong
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Innovative Collaboration Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Jiahao Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Innovative Collaboration Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China
| | - Zhiwen Fan
- Department of Pathology, Nanjing Drum Tower Hospital Affiliated with Nanjing University Medical School, Nanjing, China
| | - Bin Chen
- Department of Nursing, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Teng Wu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Innovative Collaboration Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China.
| | - Yong Xu
- Key Laboratory of Targeted Intervention of Cardiovascular Disease and Innovative Collaboration Center for Cardiovascular Translational Medicine, Department of Pathophysiology, Nanjing Medical University, Nanjing, China; Institute of Biomedical Research, Liaocheng University, Liaocheng, China.
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44
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Sun L, Yuan Y, Chen J, Ma C, Xu Y. Brahma related gene 1 (BRG1) regulates breast cancer cell migration and invasion by activating MUC1 transcription. Biochem Biophys Res Commun 2019; 511:536-543. [DOI: 10.1016/j.bbrc.2019.02.088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 02/16/2019] [Indexed: 10/27/2022]
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