1
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Cardiovascular Disease in Obstructive Sleep Apnea: Putative Contributions of Mineralocorticoid Receptors. Int J Mol Sci 2023; 24:ijms24032245. [PMID: 36768567 PMCID: PMC9916750 DOI: 10.3390/ijms24032245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/12/2023] [Accepted: 01/20/2023] [Indexed: 01/24/2023] Open
Abstract
Obstructive sleep apnea (OSA) is a chronic and highly prevalent condition that is associated with oxidative stress, inflammation, and fibrosis, leading to endothelial dysfunction, arterial stiffness, and vascular insulin resistance, resulting in increased cardiovascular disease and overall mortality rates. To date, OSA remains vastly underdiagnosed and undertreated, with conventional treatments yielding relatively discouraging results for improving cardiovascular outcomes in OSA patients. As such, a better mechanistic understanding of OSA-associated cardiovascular disease (CVD) and the development of novel adjuvant therapeutic targets are critically needed. It is well-established that inappropriate mineralocorticoid receptor (MR) activation in cardiovascular tissues plays a causal role in a multitude of CVD states. Clinical studies and experimental models of OSA lead to increased secretion of the MR ligand aldosterone and excessive MR activation. Furthermore, MR activation has been associated with worsened OSA prognosis. Despite these documented relationships, there have been no studies exploring the causal involvement of MR signaling in OSA-associated CVD. Further, scarce clinical studies have exclusively assessed the beneficial role of MR antagonists for the treatment of systemic hypertension commonly associated with OSA. Here, we provide a comprehensive overview of overlapping mechanistic pathways recruited in the context of MR activation- and OSA-induced CVD and propose MR-targeted therapy as a potential avenue to abrogate the deleterious cardiovascular consequences of OSA.
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2
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Jung HJ, Coleman R, Woodward OM, Welling PA. Doxycycline Changes the Transcriptome Profile of mIMCD3 Renal Epithelial Cells. Front Physiol 2021; 12:771691. [PMID: 34803745 PMCID: PMC8602682 DOI: 10.3389/fphys.2021.771691] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 10/18/2021] [Indexed: 12/12/2022] Open
Abstract
Tetracycline-inducible gene expression systems have been used successfully to study gene function in vivo and in vitro renal epithelial models but the effects of the common inducing agent, doxycycline (DOX), on gene expression are not well appreciated. Here, we evaluated the DOX effects on the transcriptome of a widely used renal epithelial cell model, mIMCD3 cells, to establish a reference. Cells were grown on permeable filter supports in the absence and presence of DOX (3 or 6 days), and genome-wide transcriptome profiles were assessed using RNA-Seq. We found DOX significantly altered the transcriptome profile, changing the abundance of 1,549 transcripts at 3 days and 2,643 transcripts at 6 days. Within 3 days of treatment, DOX significantly decreased the expression of multiple signaling pathways (ERK, cAMP, and Notch) that are associated with cell proliferation and differentiation. Genes associated with cell cycle progression were subsequently downregulated in cells treated with DOX for 6 days, as were genes involved in cellular immune response processes and several cytokines and chemokines, correlating with a remarkable repression of genes encoding cell proliferation markers. The results provide new insight into responses of renal epithelial cells to DOX and a establish a resource for DOX-mediated gene expression systems.
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Affiliation(s)
- Hyun Jun Jung
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Richard Coleman
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Owen M Woodward
- Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Paul A Welling
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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3
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Feraille É, Olivier V. [Role of distal nephron in the control of extracellular volume in physiology and in nephrotic syndrome]. Med Sci (Paris) 2021; 37:359-365. [PMID: 33908853 DOI: 10.1051/medsci/2021032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The kidney plays a major role to maintain the constancy of the "milieu intérieur" by adjusting the urinary excretion of water and solutes to the requirement of the body balance. This function is coordinated with elimination of waste products generated among others by the catabolism of proteins and nucleic acids. To cope with these two major functions, the human kidneys generate each day about 180 L of ultrafiltrate from plasma and reabsorbs the vast majority of filtered water and solutes to excrete daily about one-two liter(s) of urine containing concentrations of sodium, potassium and chloride ranging from 20 to 200 mM. The final adjustment of urine composition is finely tuned along the aldosterone-sensitive distal nephron (ASDN) which includes the distal convoluted tubule and the collecting system (connecting tubule and collecting duct). Sodium reabsorption is predominant along the distal tubule if potassium must be spared, or along the collecting system when large amounts of potassium must be secreted. Nephrotic syndrome is characterized by heavy proteinuria consecutive to a glomerular injury, associated with renal sodium and water retention taking initially place along ASDN and leading to edema.
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Affiliation(s)
- Éric Feraille
- Département de physiologie cellulaire et métabolisme, Université de Genève, Centre médical universitaire, 1 rue Michel-Servet, CH-1211 Genève 4, Suisse
| | - Valérie Olivier
- Département de physiologie cellulaire et métabolisme, Université de Genève, Centre médical universitaire, 1 rue Michel-Servet, CH-1211 Genève 4, Suisse
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4
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Jung HJ, Kwon TH. New insights into the transcriptional regulation of aquaporin-2 and the treatment of X-linked hereditary nephrogenic diabetes insipidus. Kidney Res Clin Pract 2019; 38:145-158. [PMID: 31189221 PMCID: PMC6577206 DOI: 10.23876/j.krcp.19.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 02/09/2019] [Accepted: 02/11/2019] [Indexed: 12/18/2022] Open
Abstract
The kidney collecting duct (CD) is a tubular segment of the kidney where the osmolality and final flow rate of urine are established, enabling urine concentration and body water homeostasis. Water reabsorption in the CD depends on the action of arginine vasopressin (AVP) and a transepithelial osmotic gradient between the luminal fluid and surrounding interstitium. AVP induces transcellular water reabsorption across CD principal cells through associated signaling pathways after binding to arginine vasopressin receptor 2 (AVPR2). This signaling cascade regulates the water channel protein aquaporin-2 (AQP2). AQP2 is exclusively localized in kidney connecting tubules and CDs. Specifically, AVP stimulates the intracellular translocation of AQP2-containing vesicles to the apical plasma membrane, increasing the osmotic water permeability of CD cells. Moreover, AVP induces transcription of the Aqp2 gene, increasing AQP2 protein abundance. This review provides new insights into the transcriptional regulation of the Aqp2 gene in the kidney CD with an overview of AVP and AQP2. It summarizes current therapeutic approaches for X-linked nephrogenic diabetes insipidus caused by AVPR2 gene mutations.
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Affiliation(s)
- Hyun Jun Jung
- Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Tae-Hwan Kwon
- Department of Biochemistry and Cell Biology, School of Medicine, Kyungpook National University, Daegu, Korea
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5
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Affiliation(s)
- Mingyu Liang
- From the Center of Systems Molecular Medicine, Department of Physiology, Medical College of Wisconsin, Milwaukee
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6
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Liu Y, Peng W, Qu K, Lin X, Zeng Z, Chen J, Wei D, Wang Z. TET2: A Novel Epigenetic Regulator and Potential Intervention Target for Atherosclerosis. DNA Cell Biol 2018; 37:517-523. [PMID: 29653065 DOI: 10.1089/dna.2017.4118] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Atherosclerosis is the underlying cause of cardio-cerebrovascular disease. However, the mechanisms of atherosclerosis are still unclear. The modification of DNA methylation has an important role in atherosclerosis development. As a member of the Ten-eleven translocation (TET) family, TET methylcytosine dioxygenase 2 (TET2) can modify DNA methylation by catalyzing 5-methylcytosine to 5-hydroxymethylcytosine and mediate DNA demethylation. Recent findings suggest that TET2 is related to the phenotype transformation of vascular smooth muscle cells, endothelial dysfunction, and inflammation of macrophage, the key factors of atherosclerosis. Therefore, TET2 may be a potential target for atherosclerosis treatment. This review will elaborate the recent findings that suggest the role of TET2 in atherosclerosis.
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Affiliation(s)
- Yami Liu
- 1 Key Laboratory for Atherosclerology of Hunan Province, Institute of Cardiovascular Disease, University of South China , Hengyang, China
| | - Wen Peng
- 2 Department of Spine Surgery, The First Affiliated Hospital, University of South China , Hengyang, China
| | - Kai Qu
- 3 College of Bioengineering, Chongqing University , Chongqing, China
| | - Xiaolong Lin
- 4 Department of Pathology, The Third People's Hospital of Huizhou , Huizhou, China
| | - Zhaolin Zeng
- 1 Key Laboratory for Atherosclerology of Hunan Province, Institute of Cardiovascular Disease, University of South China , Hengyang, China
| | - Jiaojiao Chen
- 1 Key Laboratory for Atherosclerology of Hunan Province, Institute of Cardiovascular Disease, University of South China , Hengyang, China
| | - Dangheng Wei
- 1 Key Laboratory for Atherosclerology of Hunan Province, Institute of Cardiovascular Disease, University of South China , Hengyang, China
| | - Zuo Wang
- 1 Key Laboratory for Atherosclerology of Hunan Province, Institute of Cardiovascular Disease, University of South China , Hengyang, China
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7
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Poulsen SB, Limbutara K, Fenton RA, Pisitkun T, Christensen BM. RNA sequencing of kidney distal tubule cells reveals multiple mediators of chronic aldosterone action. Physiol Genomics 2018. [PMID: 29521601 DOI: 10.1152/physiolgenomics.00084.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The renal aldosterone-sensitive distal tubule (ASDT) is crucial for sodium reabsorption and blood pressure regulation. The ASDT consists of the late distal convoluted tubule (DCT2), connecting tubule (CNT), and collecting duct. Due to difficulties in isolating epithelial cells from the ASDT in large quantities, few transcriptome studies have been performed on this segment. Moreover, no studies exist on isolated DCT2 and CNT cells (excluding intercalated cells), and the role of aldosterone for regulating the transcriptome of these specific cell types is largely unknown. A mouse model expressing eGFP in DCT2/CNT/initial cortical collecting duct (iCCD) principal cells was exploited to facilitate the isolation of these cells in high number and purity. Combined with deep RNA sequencing technology, a comprehensive catalog of chronic aldosterone-regulated transcripts from enriched DCT2/CNT/iCCD principal cells was generated. There were 257 significantly downregulated and 290 upregulated transcripts in response to aldosterone ( P < 0.05). The RNA sequencing confirmed aldosterone regulation of well-described aldosterone targets including Sgk1 and Tsc22d3. Changes in selected transcripts such as S100a1 and Cldn4 were confirmed by RT-qPCR. The RNA sequencing showed downregulation of Nr3c2 encoding the mineralocorticoid receptor (MR), and cell line experiments showed a parallel decrease in MR protein. Furthermore, a large number of transcripts encoding transcription factors were downregulated. An extensive mRNA transcriptome reconstruction of an enriched CNT/iCCD principal cell population was also generated. The results provided a comprehensive database of aldosterone-regulated transcripts in the ASDT, allowing development of novel hypotheses for the action of aldosterone.
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Affiliation(s)
| | - Kavee Limbutara
- Systems Biology (CUSB) Center, Chulalongkorn University , Bangkok , Thailand
| | - Robert A Fenton
- Department of Biomedicine, Aarhus University , Aarhus , Denmark
| | - Trairak Pisitkun
- Systems Biology (CUSB) Center, Chulalongkorn University , Bangkok , Thailand
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Hervouet E, Peixoto P, Delage-Mourroux R, Boyer-Guittaut M, Cartron PF. Specific or not specific recruitment of DNMTs for DNA methylation, an epigenetic dilemma. Clin Epigenetics 2018; 10:17. [PMID: 29449903 PMCID: PMC5807744 DOI: 10.1186/s13148-018-0450-y] [Citation(s) in RCA: 138] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 01/30/2018] [Indexed: 11/28/2022] Open
Abstract
Our current view of DNA methylation processes is strongly moving: First, even if it was generally admitted that DNMT3A and DNMT3B are associated with de novo methylation and DNMT1 is associated with inheritance DNA methylation, these distinctions are now not so clear. Secondly, since one decade, many partners of DNMTs have been involved in both the regulation of DNA methylation activity and DNMT recruitment on DNA. The high diversity of interactions and the combination of these interactions let us to subclass the different DNMT-including complexes. For example, the DNMT3L/DNMT3A complex is mainly related to de novo DNA methylation in embryonic states, whereas the DNMT1/PCNA/UHRF1 complex is required for maintaining global DNA methylation following DNA replication. On the opposite to these unspecific DNA methylation machineries (no preferential DNA sequence), some recently identified DNMT-including complexes are recruited on specific DNA sequences. The coexistence of both types of DNA methylation (un/specific) suggests a close cooperation and an orchestration between these systems to maintain genome and epigenome integrities. Deregulation of these systems can lead to pathologic disorders.
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Affiliation(s)
- Eric Hervouet
- INSERM unit 1098, University of Bourgogne Franche-Comté, Besançon, France.,EPIGENExp (EPIgenetics and GENe EXPression Technical Platform), Besançon, France
| | - Paul Peixoto
- INSERM unit 1098, University of Bourgogne Franche-Comté, Besançon, France.,EPIGENExp (EPIgenetics and GENe EXPression Technical Platform), Besançon, France
| | | | | | - Pierre-François Cartron
- 3INSERM unit S1232, University of Nantes, Nantes, France.,4Institut de cancérologie de l'Ouest, Nantes, France.,REpiCGO (Cancéropole Grand-Ouest), Nantes, France.,EpiSAVMEN Networks, Nantes, Région Pays de la Loire France
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9
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Ruhs S, Nolze A, Hübschmann R, Grossmann C. 30 YEARS OF THE MINERALOCORTICOID RECEPTOR: Nongenomic effects via the mineralocorticoid receptor. J Endocrinol 2017; 234:T107-T124. [PMID: 28348113 DOI: 10.1530/joe-16-0659] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 03/27/2017] [Indexed: 12/12/2022]
Abstract
The mineralocorticoid receptor (MR) belongs to the steroid hormone receptor family and classically functions as a ligand-dependent transcription factor. It is involved in water-electrolyte homeostasis and blood pressure regulation but independent from these effects also furthers inflammation, fibrosis, hypertrophy and remodeling in cardiovascular tissues. Next to genomic effects, aldosterone elicits very rapid actions within minutes that do not require transcription or translation and that occur not only in classical MR epithelial target organs like kidney and colon but also in nonepithelial tissues like heart, vasculature and adipose tissue. Most of these effects can be mediated by classical MR and its crosstalk with different signaling cascades. Near the plasma membrane, the MR seems to be associated with caveolin and striatin as well as with receptor tyrosine kinases like EGFR, PDGFR and IGF1R and G protein-coupled receptors like AT1 and GPER1, which then mediate nongenomic aldosterone effects. GPER1 has also been named a putative novel MR. There is a close interaction and functional synergism between the genomic and the nongenomic signaling so that nongenomic signaling can lead to long-term effects and support genomic actions. Therefore, understanding nongenomic aldosterone/MR effects is of potential relevance for modulating genomic aldosterone effects and may provide additional targets for intervention.
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Affiliation(s)
- Stefanie Ruhs
- Julius Bernstein Institute of PhysiologyMartin Luther University Halle-Wittenberg, Halle, Germany
| | - Alexander Nolze
- Julius Bernstein Institute of PhysiologyMartin Luther University Halle-Wittenberg, Halle, Germany
| | - Ralf Hübschmann
- Julius Bernstein Institute of PhysiologyMartin Luther University Halle-Wittenberg, Halle, Germany
| | - Claudia Grossmann
- Julius Bernstein Institute of PhysiologyMartin Luther University Halle-Wittenberg, Halle, Germany
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10
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Hu XQ, Dasgupta C, Chen M, Xiao D, Huang X, Han L, Yang S, Xu Z, Zhang L. Pregnancy Reprograms Large-Conductance Ca 2+-Activated K + Channel in Uterine Arteries: Roles of Ten-Eleven Translocation Methylcytosine Dioxygenase 1-Mediated Active Demethylation. Hypertension 2017; 69:1181-1191. [PMID: 28396535 DOI: 10.1161/hypertensionaha.117.09059] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/03/2017] [Accepted: 03/07/2017] [Indexed: 12/15/2022]
Abstract
The large-conductance Ca2+-activated K+ (BKCa) channel is of critical importance in pregnancy-mediated increase in uterine artery vasodilation and blood flow. The present study tested the hypothesis that active DNA demethylation plays a key role in pregnancy-induced reprogramming and upregulation of BKCa channel β1 subunit (BKβ1) in uterine arteries. Uterine arteries were isolated from nonpregnant and near-term pregnant sheep. Pregnancy significantly increased the expression of ten-eleven translocation methylcytosine dioxygenase 1 (TET1) in uterine arteries. A half-palindromic estrogen response element was identified at the TET1 promoter, and estrogen treatment increased TET1 promoter activity and TET1 expression in uterine arteries. In accordance, pregnancy and steroid hormone treatment resulted in demethylation of BKβ1 promoter by increasing 5-hydroxymethylcytosine and decreasing 5-methylcytosine at the CpG in the Sp1-380 binding site that is of critical importance in the regulation of the promoter activity and BKβ1 expression. Inhibition of TET1 with fumarate significantly decreased BKβ1 expression in uterine arteries of pregnant animals and blocked steroid hormone-induced upregulation of BKβ1. Functionally, fumarate treatment inhibited pregnancy and steroid hormone-induced increases in BKCa channel current density and BKCa channel-mediated relaxations. In addition, fumarate blocked pregnancy and steroid hormone-induced decrease in pressure-dependent myogenic tone of the uterine artery. The results demonstrate a novel mechanism of estrogen-mediated active DNA demethylation in reprogramming of BKCa channel expression and function in the adaption of uterine circulation during pregnancy.
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Affiliation(s)
- Xiang-Qun Hu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Chiranjib Dasgupta
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Man Chen
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Daliao Xiao
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Xiaohui Huang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Limin Han
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Shumei Yang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Zhice Xu
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.)
| | - Lubo Zhang
- Institute for Fetology, First Hospital of Soochow University, Suzhou, China (X.-Q.H., Z.X., L.Z.); Lawrence D. Longo MD Center for Perinatal Biology, Department of Basic Sciences, Loma Linda University School of Medicine, CA (X.-Q.H., C.D., D.X., X.H., Z.X., L.Z.); Department of Chemistry and Biochemistry, California State University, San Bernardino (S.Y.).
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11
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Wanner N, Bechtel-Walz W. Epigenetics of kidney disease. Cell Tissue Res 2017; 369:75-92. [PMID: 28286899 DOI: 10.1007/s00441-017-2588-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 02/15/2017] [Indexed: 02/06/2023]
Abstract
DNA methylation and histone modifications determine renal programming and the development and progression of renal disease. The identification of the way in which the renal cell epigenome is altered by environmental modifiers driving the onset and progression of renal diseases has extended our understanding of the pathophysiology of kidney disease progression. In this review, we focus on current knowledge concerning the implications of epigenetic modifications during renal disease from early development to chronic kidney disease progression including renal fibrosis, diabetic nephropathy and the translational potential of identifying new biomarkers and treatments for the prevention and therapy of chronic kidney disease and end-stage kidney disease.
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Affiliation(s)
- Nicola Wanner
- Department of Medicine IV, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,Center for Systems Biology (ZBSA), Albert-Ludwigs-University, Freiburg, Germany. .,Renal Division, University Hospital Freiburg, Breisacher Strasse 66, 79106, Freiburg, Germany.
| | - Wibke Bechtel-Walz
- Department of Medicine IV, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,Renal Division, University Hospital Freiburg, Breisacher Strasse 66, 79106, Freiburg, Germany.
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12
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Ji H, Wang Y, Jiang D, Liu G, Xu X, Dai D, Zhou X, Cui W, Li J, Chen Z, Li Y, Zhou D, Zha Q, Zhuo R, Jiang L, Liu Y, Shen L, Zhang B, Xu L, Hu H, Zhang Y, Yin H, Duan S, Wang Q. Elevated DRD4 promoter methylation increases the risk of Alzheimer's disease in males. Mol Med Rep 2016; 14:2732-8. [PMID: 27485706 DOI: 10.3892/mmr.2016.5560] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 04/22/2016] [Indexed: 11/06/2022] Open
Abstract
Aberrant promoter methylation of multiple genes is associated with various diseases, including Alzheimer's disease (AD). The goal of the present study was to determine whether dopamine receptor D4 (DRD4) promoter methylation is associated with AD. In the current study, the methylation levels of the DRD4 promoter were measured in 46 AD patients and 61 controls using bisulfite pyrosequencing technology. The results of the present study demonstrated that DRD4 promoter methylation was significantly higher in AD patients than in controls. A further breakdown analysis by gender revealed that there was a significant association of DRD4 promoter methylation with AD in males (23 patients and 45 controls). In conclusion, the results of the present study demonstrated that elevated DRD4 promoter methylation was associated with AD risk in males.
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Affiliation(s)
- Huihui Ji
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Yunliang Wang
- Department of Neurology, The 148 Central Hospital of PLA, Zibo, Shandong 255000, P.R. China
| | - Danjie Jiang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Guili Liu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Xuting Xu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Dongjun Dai
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Xiaohui Zhou
- Department of Internal Medicine for Cadres, The First Affiliated Hospital of Xinjiang Medical University, Ürümqi, Xinjiang 830000, P.R. China
| | - Wei Cui
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Jinfeng Li
- Department of Neurology, The 148 Central Hospital of PLA, Zibo, Shandong 255000, P.R. China
| | - Zhongming Chen
- Geriatric Department, Ningbo Kangning Hospital, Ningbo, Zhejiang 315201, P.R. China
| | - Ying Li
- Geriatric Department, Ningbo No. 1 Hospital, Ningbo, Zhejiang 315010, P.R. China
| | - Dongsheng Zhou
- Geriatric Department, Ningbo Kangning Hospital, Ningbo, Zhejiang 315201, P.R. China
| | - Qin Zha
- Geriatric Department, The Affiliated Hospital of School of Medicine of Ningbo University, Ningbo, Zhejiang 315200, P.R. China
| | - Renjie Zhuo
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Liting Jiang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Yu Liu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Lili Shen
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Beibei Zhang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Lei Xu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Haochang Hu
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Yuzheng Zhang
- Department of Neurology, The 148 Central Hospital of PLA, Zibo, Shandong 255000, P.R. China
| | - Honglei Yin
- Department of Neurology, The 148 Central Hospital of PLA, Zibo, Shandong 255000, P.R. China
| | - Shiwei Duan
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Qinwen Wang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
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TET2 and CSMD1 genes affect SBP response to hydrochlorothiazide in never-treated essential hypertensives. J Hypertens 2016; 33:1301-9. [PMID: 25695618 DOI: 10.1097/hjh.0000000000000541] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Thiazide diuretics have been recommended as a first-line antihypertensive treatment, although the choice of 'the right drug in the individual essential hypertensive patient' remains still empirical. Essential hypertension is a complex, polygenic disease derived from the interaction of patient's genetic background with the environment. Pharmacogenomics could be a useful tool to pinpoint gene variants involved in antihypertensive drug response, thus optimizing therapeutic advantages and minimizing side effects. METHODS AND RESULTS We looked for variants associated with blood pressure response to hydrochlorothiazide over an 8-week follow-up by means of a genome-wide association analysis in two Italian cohorts of never-treated essential hypertensive patients: 343 samples from Sardinia and 142 from Milan. TET2 and CSMD1 as plausible candidate genes to affect SBP response to hydrochlorothiazide were identified. The specificity of our findings for hydrochlorothiazide was confirmed in an independent cohort of essential hypertensive patients treated with losartan. Our best findings were also tested for replication in four independent hypertensive samples of European Ancestry, such as GENetics of drug RESponsiveness in essential hypertension, Genetic Epidemiology of Responses to Antihypertensives, NORdic DILtiazem intervention, Pharmacogenomics Evaluation of Antihypertensive Responses, and Campania Salute Network-StayOnDiur. We validated a polymorphism in CSMD1 and UGGT2. CONCLUSION This exploratory study reports two plausible loci associated with SBP response to hydrochlorothiazide: TET2, an aldosterone-responsive mediator of αENaC gene transcription; and CSMD1, previously described as associated with hypertension in a case-control study.
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Abstract
Heart disease is a leading cause of death in the United States, and hypertension is a predominant risk factor. Thus, effective blood pressure control is important to prevent adverse sequelae of hypertension, including heart failure, coronary artery disease, atrial fibrillation, and ischemic stroke. Over half of Americans have uncontrolled blood pressure, which may in part be explained by interpatient variability in drug response secondary to genetic polymorphism. As such, pharmacogenetic testing may be a supplementary tool to guide treatment. This review highlights the pharmacogenetics of antihypertensive response and response to drugs that treat adverse hypertension-related sequelae, particularly coronary artery disease and atrial fibrillation. While pharmacogenetic evidence may be more robust for the latter with respect to clinical implementation, there is increasing evidence of genetic variants that may help predict antihypertensive response. However, additional research and validation are needed before clinical implementation guidelines for antihypertensive therapy can become a reality.
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Luo M, Zhou X, Ji H, Ma W, Liu G, Dai D, Li J, Chang L, Xu L, Jiang L, Duan S, Wang Q. Population Difference in the Associations of KLOTH Promoter Methylation with Mild Cognitive Impairment in Xinjiang Uygur and Han Populations. PLoS One 2015. [PMID: 26197428 PMCID: PMC4509908 DOI: 10.1371/journal.pone.0132156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Background Mild cognitive impairment (MCI) is the intermediate stage of the cognitive changes between normal aging and dementia. KLOTH is an age-related gene that may contribute to the risk of MCI. The aim of our study was to explore the association between KLOTHO promoter methylation and MCI in Xinjiang Uygur and Han populations. Methods DNA methylation assay was performed using the bisulphite pyrosequencing technology among 96 Uygur (48 MCI and 48 controls) and 96 Han (48 MCI and 48 controls) Chinese individuals from Xinjiang province of China. Results We found significant association between KLOTHO promoter methylation and MCI in the Han Chinese (CpG1: p = 3.77E-06; CpG2: p = 1.91E-07; CpG3: p = 5.83E-07; CpG4: p = 2.23E-05; CpG5: p = 3.03E-06) but not in the Uygur Chinese. Higher KLOTHO promoter methylation levels were found in Han MCI patients than Uygur MCI patients for all the five CpGs (adjusted p values by age < 0.02). Conclusion Our results showed that KLOTHO promoter hypermethylation contributed to the MCI risk in Xinjiang Han Chinese but not in Xinjiang Uygur Chinese. The population difference of KLOTHO methylation in the risk of MCI required further investigation in the future.
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Affiliation(s)
- Mei Luo
- Department of Internal Medicine for Cadres, the First Affiliated Hospital of Xinjiang Medical University, Urumchi, 830000, China
| | - Xiaohui Zhou
- Department of Internal Medicine for Cadres, the First Affiliated Hospital of Xinjiang Medical University, Urumchi, 830000, China
| | - Huihui Ji
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Wenjuan Ma
- Department of Internal Medicine for Cadres, the First Affiliated Hospital of Xinjiang Medical University, Urumchi, 830000, China
| | - Guili Liu
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Dongjun Dai
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Jingyun Li
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Lan Chang
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Lei Xu
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Liting Jiang
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Shiwei Duan
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Qinwen Wang
- Ningbo Key Lab of Behavior Neuroscience, Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China
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Recent developments in epigenetics of acute and chronic kidney diseases. Kidney Int 2015; 88:250-61. [PMID: 25993323 PMCID: PMC4522401 DOI: 10.1038/ki.2015.148] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 03/22/2015] [Accepted: 03/30/2015] [Indexed: 12/25/2022]
Abstract
The growing epidemic of obesity and diabetes, the aging population as well as prevalence of drug abuse has led to significant increases in the rates of the closely associated acute and chronic kidney diseases, including diabetic nephropathy. Furthermore, evidence shows that parental behavior and diet can affect the phenotype of subsequent generations via epigenetic transmission mechanisms. These data suggest a strong influence of the environment on disease susceptibility and that, apart from genetic susceptibility, epigenetic mechanisms need to be evaluated to gain critical new information about kidney diseases. Epigenetics is the study of processes that control gene expression and phenotype without alterations in the underlying DNA sequence. Epigenetic modifications, including cytosine DNA methylation and covalent post translational modifications of histones in chromatin are part of the epigenome, the interface between the stable genome and the variable environment. This dynamic epigenetic layer responds to external environmental cues to influence the expression of genes associated with disease states. The field of epigenetics has seen remarkable growth in the past few years with significant advances in basic biology, contributions to human disease, as well as epigenomics technologies. Further understanding of how the renal cell epigenome is altered by metabolic and other stimuli can yield novel new insights into the pathogenesis of kidney diseases. In this review, we have discussed the current knowledge on the role of epigenetic mechanisms (primarily DNA me and histone modifications) in acute and chronic kidney diseases, and their translational potential to identify much needed new therapies.
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Hypertensive epigenetics: from DNA methylation to microRNAs. J Hum Hypertens 2015; 29:575-82. [PMID: 25631220 DOI: 10.1038/jhh.2014.132] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 11/18/2014] [Accepted: 12/09/2014] [Indexed: 01/13/2023]
Abstract
The major epigenetic features of mammalian cells include DNA methylation, posttranslational histone modifications and RNA-based mechanisms including those controlled by small non-coding RNAs (microRNAs (miRNAs)). An important aspect of epigenetic mechanisms is that they are potentially reversible and may be influenced by nutritional-environmental factors and through gene-environment interactions. Studies on epigenetic modulations could help us understand the mechanisms involved in essential hypertension and further prevent it's progress. This review is focused on new knowledge on the role of epigenetics, from DNA methylation to miRNAs, in essential hypertension.
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Greenlee MM, Mitzelfelt JD, Duke BJ, Al-Khalili O, Bao HF, Eaton DC. Prolactin stimulates sodium and chloride ion channels in A6 renal epithelial cells. Am J Physiol Renal Physiol 2015; 308:F697-705. [PMID: 25587116 DOI: 10.1152/ajprenal.00270.2014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 01/07/2015] [Indexed: 11/22/2022] Open
Abstract
Many hormonal pathways contribute to the regulation of renal epithelial sodium channel (ENaC) function, a key process for maintaining blood volume and controlling blood pressure. In the present study, we examined whether the peptide hormone prolactin (PRL) regulates ENaC function in renal epithelial cells (A6). Basolateral application of several different concentrations of PRL dramatically stimulated the transepithelial current in A6 cells, increasing both amiloride-sensitive (ENaC) and amiloride-insensitive currents. Using cell-attached patch clamp, we determined that PRL increased both the number (N) and open probability (Po) of ENaC present in the apical membrane. Inhibition of PKA with H-89 abolished the effect of PRL on amiloride-sensitive and insensitive transepithelial currents and eliminated the increase in ENaC NPo with PRL exposure. PRL also increased cAMP in A6 cells, consistent with signaling through the cAMP-dependent PKA pathway. We also identified that PRL induced activity of a 2-pS anion channel with outward rectification, electrophysiological properties consistent with ClC4 or ClC5. RT-PCR only detected ClC4, but not ClC5 transcripts. Here, we show for the first time that PRL activates sodium and chloride transport in renal epithelial cells via ENaC and ClC4.
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Affiliation(s)
- Megan M Greenlee
- Department of Physiology, Emory University School of Medicine, Atlanta, Georgia
| | | | - Billie Jeanne Duke
- Department of Physiology, Emory University School of Medicine, Atlanta, Georgia
| | - Otor Al-Khalili
- Department of Physiology, Emory University School of Medicine, Atlanta, Georgia
| | - Hui-Fang Bao
- Department of Physiology, Emory University School of Medicine, Atlanta, Georgia
| | - Douglas C Eaton
- Department of Physiology, Emory University School of Medicine, Atlanta, Georgia
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