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Lazzerini PE, Murthy Ginjupalli VK, Srivastava U, Bertolozzi I, Bacarelli MR, Verrengia D, Salvini V, Accioli R, Carbone SF, Santoro A, Cartocci A, Cevenini G, Cantara S, Cantore A, Bisogno S, Brucato A, Laghi-Pasini F, Acampa M, Capecchi PL, Boutjdir M. Anti-Ro/SSA Antibodies Blocking Calcium Channels as a Potentially Reversible Cause of Atrioventricular Block in Adults. JACC Clin Electrophysiol 2023; 9:1631-1648. [PMID: 37227349 DOI: 10.1016/j.jacep.2023.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/10/2023] [Accepted: 03/10/2023] [Indexed: 05/26/2023]
Abstract
BACKGROUND In ∼50% of severe atrioventricular blocks (AVBs) occurring in adults <50 years, the underlying etiology remains unknown. Preliminary evidence from case reports suggests that autoimmunity, specifically the presence of circulating anti-Ro/SSA antibodies in the patient (acquired form), in the patient's mother (late-progressive congenital form), or in both (mixed form), could be involved in a fraction of idiopathic AVBs in adults by possibly targeting the L-type calcium channel (Cav1.2) and inhibiting the related current (ICaL). OBJECTIVES The purpose of this study was to evaluate whether anti-Ro/SSA antibodies are causally implicated in the development of isolated AVBs in adults. METHODS Thirty-four consecutive patients with isolated AVB of unknown origin and 17 available mothers were prospectively enrolled in a cross-sectional study. Anti-Ro/SSA antibodies were assessed by fluoroenzyme-immunoassay, immuno-Western blotting, and line-blot immunoassay. Purified immunoglobulin-G (IgG) from anti-Ro/SSA-positive and anti-Ro/SSA-negative subjects were tested on ICaL and Cav1.2 expression using tSA201 and HEK293 cells, respectively. Moreover, in 13 AVB patients, the impact of a short course of steroid therapy on AV conduction was evaluated. RESULTS Anti-Ro/SSA antibodies, particularly anti-Ro/SSA-52kD, were found in 53% of AVB-patients and/or in their mothers, most commonly an acquired or mixed form (two-thirds of cases) without history of autoimmune diseases. Purified IgG from anti-Ro/SSA-positive but not anti-Ro/SSA-negative AVB patients acutely inhibited ICaL and chronically down-regulated Cav1.2 expression. Moreover, anti-Ro/SSA-positive sera showed high reactivity with peptides corresponding to the Cav1.2 channel pore-forming region. Finally, steroid therapy rapidly improved AV conduction in AVB-patients with circulating anti-Ro/SSA antibodies but not in those without. CONCLUSIONS Our study points to anti-Ro/SSA antibodies as a novel, epidemiologically relevant and potentially reversible cause of isolated AVB in adults, via an autoimmune-mediated functional interference with the L-type calcium channels. These findings have significant impact on antiarrhythmic therapies by avoiding or delaying pacemaker implantation.
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Affiliation(s)
- Pietro Enea Lazzerini
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy.
| | | | - Ujala Srivastava
- VA New York Harbor Healthcare System, SUNY Downstate Health Science University, New York, New York, USA
| | - Iacopo Bertolozzi
- Cardiology Intensive Therapy Unit, Department of Internal Medicine, Nuovo Ospedale San Giovanni di Dio, Florence, Italy
| | - Maria Romana Bacarelli
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Decoroso Verrengia
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Viola Salvini
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Riccardo Accioli
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | | | - Amato Santoro
- Cardio-thoracic Department, University Hospital of Siena, Siena, Italy
| | | | - Gabriele Cevenini
- Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Silvia Cantara
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy; Laboratory of Clinical and Translational Research, University Hospital of Siena, Siena, Italy
| | - Anna Cantore
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Stefania Bisogno
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Antonio Brucato
- Department of Biomedical and Clinical Sciences, University of Milan, Milan, Italy
| | - Franco Laghi-Pasini
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | | | - Pier Leopoldo Capecchi
- Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Siena, Italy
| | - Mohamed Boutjdir
- VA New York Harbor Healthcare System, SUNY Downstate Health Science University, New York, New York, USA; NYU Grossman School of Medicine, New York, New York, USA
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2
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Enhancement of human iPSC-derived cardiomyocyte maturation by chemical conditioning in a 3D environment. J Mol Cell Cardiol 2019; 138:1-11. [PMID: 31655038 DOI: 10.1016/j.yjmcc.2019.10.001] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/30/2019] [Accepted: 10/06/2019] [Indexed: 12/18/2022]
Abstract
Recent advances in the understanding and use of pluripotent stem cells have produced major changes in approaches to the diagnosis and treatment of human disease. An obstacle to the use of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) for regenerative medicine, disease modeling and drug discovery is their immature state relative to adult myocardium. We show the effects of a combination of biochemical factors, thyroid hormone, dexamethasone, and insulin-like growth factor-1 (TDI) on the maturation of hiPSC-CMs in 3D cardiac microtissues (CMTs) that recapitulate aspects of the native myocardium. Based on a comparison of the gene expression profiles and the structural, ultrastructural, and electrophysiological properties of hiPSC-CMs in monolayers and CMTs, and measurements of the mechanical and pharmacological properties of CMTs, we find that TDI treatment in a 3D tissue context yields a higher fidelity adult cardiac phenotype, including sarcoplasmic reticulum function and contractile properties consistent with promotion of the maturation of hiPSC derived cardiomyocytes.
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3
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Ong ML, Tuan TA, Poh J, Teh AL, Chen L, Pan H, MacIsaac JL, Kobor MS, Chong YS, Kwek K, Saw SM, Godfrey KM, Gluckman PD, Fortier MV, Karnani N, Meaney MJ, Qiu A, Holbrook JD. Neonatal amygdalae and hippocampi are influenced by genotype and prenatal environment, and reflected in the neonatal DNA methylome. GENES BRAIN AND BEHAVIOR 2019; 18:e12576. [PMID: 31020763 DOI: 10.1111/gbb.12576] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 03/01/2019] [Accepted: 04/13/2019] [Indexed: 12/28/2022]
Abstract
The amygdala and hippocampus undergo rapid development in early life. The relative contribution of genetic and environmental factors to the establishment of their developmental trajectories has yet to be examined. We performed imaging on neonates and examined how the observed variation in volume and microstructure of the amygdala and hippocampus varied by genotype, and compared with prenatal maternal mental health and socioeconomic status. Gene × Environment models outcompeted models containing genotype or environment only to best explain the majority of measures but some, especially of the amygdaloid microstructure, were best explained by genotype only. Models including DNA methylation measured in the neonate umbilical cords outcompeted the Gene and Gene × Environment models for the majority of amygdaloid measures and minority of hippocampal measures. This study identified brain region-specific gene networks associated with individual differences in fetal brain development. In particular, genetic and epigenetic variation within CUX1 was highlighted.
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Affiliation(s)
- Mei-Lyn Ong
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
| | - Ta A Tuan
- Department of Biomedical Engineering, Clinical Imaging research Centre, National University of Singapore, Singapore
| | - Joann Poh
- Department of Biomedical Engineering, Clinical Imaging research Centre, National University of Singapore, Singapore
| | - Ai L Teh
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
| | - Li Chen
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
| | - Hong Pan
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore.,School of Computer Engineering, Nanyang Technological University (NTU), Singapore
| | - Julia L MacIsaac
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Michael S Kobor
- Centre for Molecular Medicine and Therapeutics, Child and Family Research Institute, Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada
| | - Yap S Chong
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore.,Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore
| | - Kenneth Kwek
- KK Women's and Children's Hospital, Duke National University of Singapore, Singapore
| | - Seang M Saw
- Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore
| | - Keith M Godfrey
- MRC Lifecourse Epidemiology Unit and NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Peter D Gluckman
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore.,Centre for Human Evolution, Adaptation and disease, Liggins Institute, University of Auckland, Auckland, New Zealand
| | - Marielle V Fortier
- KK Women's and Children's Hospital, Duke National University of Singapore, Singapore
| | - Neerja Karnani
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
| | - Michael J Meaney
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore.,Ludmer Centre for Neuroinformatics and Mental Health, Sackler Program for Epigenetics & Psychobiology at McGill University, Douglas University Mental Health Institute, McGill University, Montreal, Canada
| | - Anqi Qiu
- Department of Biomedical Engineering, Clinical Imaging research Centre, National University of Singapore, Singapore.,Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
| | - Joanna D Holbrook
- Singapore Institute of Clinical sciences (SICS), A*STAR, Brenner Centre for Molecular Medicine, Singapore
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4
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Falcón D, González-Montelongo R, Sánchez de Rojas-de Pedro E, Ordóñez A, Ureña J, Castellano A. Dexamethasone-induced upregulation of Ca V3.2 T-type Ca 2+ channels in rat cardiac myocytes. J Steroid Biochem Mol Biol 2018; 178:193-202. [PMID: 29262379 DOI: 10.1016/j.jsbmb.2017.12.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 11/21/2017] [Accepted: 12/14/2017] [Indexed: 12/27/2022]
Abstract
Glucocorticoids are widely used to treat acute and chronic diseases. Unfortunately, their therapeutic use is associated with severe side effects. Glucocorticoids are known to regulate several ion channels in cardiac myocytes, including voltage-dependent Ca2+ channels. Low-voltage-activated T-type Ca2+ channels are expressed in ventricular myocytes during the fetal and perinatal period, but are practically absent in the adult. However, these channels can be re-expressed in adult cardiomyocytes under some pathological conditions. We have investigated the glucocorticoid regulation of T-type Ca2+ channels in rat cardiomyocytes. Molecular studies revealed that dexamethasone induces the upregulation of CaV3.2 mRNA in neonatal rat ventricular myocytes, whereas CaV3.1 mRNA is only slightly affected. Patch-clamp recordings confirmed that T-type Ca2+ channel currents were upregulated in dexamethasone treated cardiomyocytes, and the addition of 50 μmol/L NiCl2 demonstrated that the CaV3.2 channel is responsible for this upregulation. The effect of dexamethasone on CaV3.2 is mediated by the activation and translocation to the cell nucleus of the glucocorticoid receptor (GR). We have isolated the upstream promoter of the Cacna1h gene and tested its activity in transfected ventricular myocytes. The initial in silico analysis of Cacna1h promoter revealed putative glucocorticoid response elements (GREs). Transcriptional activity assays combined with deletion analyses and chromatin immunoprecipitation assays demonstrated that GR binds to a region a GRE located in -1006/-985 bp of Cacna1h promoter. Importantly, upregulation of the CaV3.2 channel is also observed in vitro in adult rat ventricular myocytes, and in vivo in a rat model of excess of glucocorticoids.
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Affiliation(s)
- D Falcón
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain; Departamento de Fisiología Médica y Biofísica, Facultad de Medicina, Universidad de Sevilla, Sevilla, Spain
| | - R González-Montelongo
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain; Departamento de Fisiología Médica y Biofísica, Facultad de Medicina, Universidad de Sevilla, Sevilla, Spain
| | - E Sánchez de Rojas-de Pedro
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain
| | - A Ordóñez
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain; CIBERCV Instituto de Salud Carlos III, Madrid, Spain
| | - J Ureña
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain; Departamento de Fisiología Médica y Biofísica, Facultad de Medicina, Universidad de Sevilla, Sevilla, Spain
| | - A Castellano
- Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/ Universidad de Sevilla, Sevilla, Spain; Departamento de Fisiología Médica y Biofísica, Facultad de Medicina, Universidad de Sevilla, Sevilla, Spain.
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5
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Li W, Zheng NZ, Yuan Q, Xu K, Yang F, Gu L, Zheng GY, Luo GJ, Fan C, Ji GJ, Zhang B, Cao H, Tian XL. NFAT5-mediated CACNA1C expression is critical for cardiac electrophysiological development and maturation. J Mol Med (Berl) 2016; 94:993-1002. [PMID: 27368804 DOI: 10.1007/s00109-016-1444-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 06/18/2016] [Accepted: 06/24/2016] [Indexed: 01/30/2023]
Abstract
UNLABELLED Entry of calcium into cardiomyocyte via L-type calcium channel (LTCC) is fundamental to cardiac contraction. CACNA1C, a type of LTCC and a hallmark of a matured ventricular myocyte, is developmentally regulated. Here, we identified 138 potential transcription factors by a comparative genomic study on 5-kb promoter regions of CACNA1C gene across eight vertebrate species, and showed that six factors were developmentally regulated with the expression of Cacna1c in mouse P19cl6 in vitro cardiomyocyte differentiation model. We further demonstrated that the nuclear factor of activated T cells 5 (Nfat5) bound to a consensus sequence TGGAAGCGTTC and activated the transcription of Cacna1c. The siRNA-mediated knockdown of Nfat5 suppressed the expression of Cacna1c and decreased L-type calcium current in mouse neonatal cardiomyocytes. Furthermore, morpholino-mediated knockdown of nfat5 in zebrafish prohibited the expression of cacna1c and resulted in a non-contractile ventricle, while over-expression of either cacna1c or nfat5 rescued this impaired phenotype. Thus, NFAT5-mediated expression of CACNA1C is evolutionarily conserved and critical for cardiac electrophysiological development and maturation of cardiomyocyte. KEY MESSAGE Nfat5 binds to a consensus sequence TGGAAGCGTTC in the promoter of Cacna1c. Nfat5 activates the transcription of Cacna1c. Nfat5 knockdown suppresses Cacna1c expression, decreases L-type calcium current, and results in non-beating ventricle. NFAT5-mediated expression of CACNA1C is evolutionarily conserved. NFAT5-mediated CACNA1C expression is critical for cardiac electrophysiological development and maturation.
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Affiliation(s)
- Wei Li
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Nai-Zhong Zheng
- Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Qi Yuan
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China
| | - Ke Xu
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Fan Yang
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Lei Gu
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China
| | - Gu-Yan Zheng
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Guo-Jie Luo
- School of Electronics Engineering and Computer Science, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Chun Fan
- Department of Biomedical Engineering, Lerner Research Institute, The Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, 44195, USA
| | - Guang-Ju Ji
- National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, 100101, China
| | - Bo Zhang
- Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, 5 Yiheyuan Road, Beijing, 100871, China
| | - Huiqing Cao
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China.
| | - Xiao-Li Tian
- Department of Human Population Genetics, Institute of Molecular Medicine, Peking University, 5 Yiheyuan Road, Beijing, 100871, China.
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6
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Kosmidis G, Bellin M, Ribeiro MC, van Meer B, Ward-van Oostwaard D, Passier R, Tertoolen LGJ, Mummery CL, Casini S. Altered calcium handling and increased contraction force in human embryonic stem cell derived cardiomyocytes following short term dexamethasone exposure. Biochem Biophys Res Commun 2015; 467:998-1005. [PMID: 26456652 DOI: 10.1016/j.bbrc.2015.10.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 10/05/2015] [Indexed: 10/22/2022]
Abstract
One limitation in using human pluripotent stem cell derived cardiomyocytes (hPSC-CMs) for disease modeling and cardiac safety pharmacology is their immature functional phenotype compared with adult cardiomyocytes. Here, we report that treatment of human embryonic stem cell derived cardiomyocytes (hESC-CMs) with dexamethasone, a synthetic glucocorticoid, activated glucocorticoid signaling which in turn improved their calcium handling properties and contractility. L-type calcium current and action potential properties were not affected by dexamethasone but significantly faster calcium decay, increased forces of contraction and sarcomeric lengths, were observed in hESC-CMs after dexamethasone exposure. Activating the glucocorticoid pathway can thus contribute to mediating hPSC-CMs maturation.
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Affiliation(s)
- Georgios Kosmidis
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | - Milena Bellin
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | - Marcelo C Ribeiro
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | - Berend van Meer
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Robert Passier
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands; MIRA, University of Twente, The Netherlands
| | - Leon G J Tertoolen
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | - Christine L Mummery
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands
| | - Simona Casini
- Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands.
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7
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Ito J. [Steroid hormones' genomic and non-genomic actions on cardiac voltage-gated calcium channels]. Nihon Yakurigaku Zasshi 2014; 144:206-210. [PMID: 25381888 DOI: 10.1254/fpj.144.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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8
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Glucocorticoids promote structural and functional maturation of foetal cardiomyocytes: a role for PGC-1α. Cell Death Differ 2014; 22:1106-16. [PMID: 25361084 PMCID: PMC4572859 DOI: 10.1038/cdd.2014.181] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 09/08/2014] [Accepted: 09/22/2014] [Indexed: 01/05/2023] Open
Abstract
Glucocorticoid levels rise dramatically in late gestation to mature foetal organs in readiness for postnatal life. Immature heart function may compromise survival. Cardiomyocyte glucocorticoid receptor (GR) is required for the structural and functional maturation of the foetal heart in vivo, yet the molecular mechanisms are largely unknown. Here we asked if GR activation in foetal cardiomyocytes in vitro elicits similar maturational changes. We show that physiologically relevant glucocorticoid levels improve contractility of primary-mouse-foetal cardiomyocytes, promote Z-disc assembly and the appearance of mature myofibrils, and increase mitochondrial activity. Genes induced in vitro mimic those induced in vivo and include PGC-1α, a critical regulator of cardiac mitochondrial capacity. SiRNA-mediated abrogation of the glucocorticoid induction of PGC-1α in vitro abolished the effect of glucocorticoid on myofibril structure and mitochondrial oxygen consumption. Using RNA sequencing we identified a number of transcriptional regulators, including PGC-1α, induced as primary targets of GR in foetal cardiomyocytes. These data demonstrate that PGC-1α is a key mediator of glucocorticoid-induced maturation of foetal cardiomyocyte structure and identify other candidate transcriptional regulators that may play critical roles in the transition of the foetal to neonatal heart.
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9
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T-type Ca2+ signalling downregulates MEK1/2 phosphorylation and cross-talk with the RAAS transcriptional response in cardiac myocytes. J Mol Cell Cardiol 2012; 53:291-8. [DOI: 10.1016/j.yjmcc.2012.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 05/09/2012] [Accepted: 05/10/2012] [Indexed: 12/23/2022]
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10
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Ferron L, Ruchon Y, Renaud JF, Capuano V. T-type Ca²+ signalling regulates aldosterone-induced CREB activation and cell death through PP2A activation in neonatal cardiomyocytes. Cardiovasc Res 2011; 90:105-12. [PMID: 21123217 PMCID: PMC3058735 DOI: 10.1093/cvr/cvq379] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 11/08/2010] [Accepted: 11/25/2010] [Indexed: 01/10/2023] Open
Abstract
AIMS We have investigated Ca²(+) signalling generated by aldosterone-induced T-type current (I(CaT)), the effects of I(CaT) in neonatal cardiomyocytes, and a putative role for I(CaT) in cardiomyocytes during cardiac pathology induced by stenosis in an adult rat. METHODS AND RESULTS Neonatal rat cardiomyocytes treated with aldosterone showed an increase in I(CaT) density, principally due to the upregulation of the T-type channel Ca(v)3.1 (by 80%). Aldosterone activated cAMP-response element-binding protein (CREB), and this activation was enhanced by blocking I(CaT) or by inhibiting protein phosphatase 2A (PP2A) activity. Aldosterone induced PP2A activity, an induction that was prevented upon I(CaT) blockade. I(CaT) exerted a negative feedback regulation on the transcription of the Ca(v)3.1 gene, and the activation of PP2A by I(CaT) led to increased levels of the pro-apoptotic markers caspase 9 and Bcl-x(S) and decreased levels of the anti-apoptotic marker Bcl-2. These findings were corroborated by flow cytometry analysis for apoptosis and necrosis. Similarly, in a rat model of cardiac disease, I(CaT) re-emergence was associated with a decrease in CREB activation and was correlated with increases in caspase 9 and Bcl-x(S) and a decrease in Bcl-2 levels. CONCLUSION Our findings establish PP2A/CREB as targets of I(CaT)-generated Ca²(+) signalling and identify an important role for I(CaT) in cardiomyocyte cell death.
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MESH Headings
- Aldosterone/metabolism
- Animals
- Animals, Newborn
- Apoptosis
- Calcium Channels, T-Type/genetics
- Calcium Channels, T-Type/metabolism
- Calcium Signaling
- Cardiomegaly/enzymology
- Cardiomegaly/pathology
- Caspase 9/metabolism
- Cells, Cultured
- Cyclic AMP Response Element-Binding Protein/metabolism
- Disease Models, Animal
- Enzyme Activation
- Flow Cytometry
- Male
- Membrane Potentials
- Myocytes, Cardiac/enzymology
- Myocytes, Cardiac/pathology
- Necrosis
- Protein Phosphatase 2/metabolism
- Proto-Oncogene Proteins c-bcl-2/metabolism
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Receptors, Glucocorticoid/metabolism
- Time Factors
- Transcription, Genetic
- bcl-X Protein/metabolism
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Affiliation(s)
- Laurent Ferron
- Département de Recherche Médicale, Remodelage tissulaire et fonctionnel: signalisation et physiopathologieCNRS-UMR8162, Le Plessis Robinson, France
| | - Yann Ruchon
- Département de Recherche Médicale, Remodelage tissulaire et fonctionnel: signalisation et physiopathologieCNRS-UMR8162, Le Plessis Robinson, France
- INSERM-U999, Université Paris-Sud XI, Hôpital Marie Lannelongue, 133 ave de la Résistance, 9230 Le Plessis Robinson, France
| | - Jean-François Renaud
- Département de Recherche Médicale, Remodelage tissulaire et fonctionnel: signalisation et physiopathologieCNRS-UMR8162, Le Plessis Robinson, France
- INSERM-U999, Université Paris-Sud XI, Hôpital Marie Lannelongue, 133 ave de la Résistance, 9230 Le Plessis Robinson, France
| | - Véronique Capuano
- Département de Recherche Médicale, Remodelage tissulaire et fonctionnel: signalisation et physiopathologieCNRS-UMR8162, Le Plessis Robinson, France
- INSERM-U999, Université Paris-Sud XI, Hôpital Marie Lannelongue, 133 ave de la Résistance, 9230 Le Plessis Robinson, France
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Yamamoto T, Ohara A, Nishikawa M, Yamamoto G, Saeki Y. Dexamethasone-induced up-regulation of two-pore domain K+ channel genes, TASK-1 and TWIK-2, in cultured human periodontal ligament fibroblasts. In Vitro Cell Dev Biol Anim 2011; 47:273-9. [PMID: 21359819 DOI: 10.1007/s11626-011-9388-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 01/26/2011] [Indexed: 12/25/2022]
Abstract
Two-pore domain K(+) channels are widely expressed in many types of cells, and have various important functions, especially maintaining the resting membrane potential. In the previous report, we have confirmed the presence of several kinds of two-pore domain K(+) channels in the periodontal ligament (PDL) fibroblasts. It is well known that dexamethasone (Dex) regulates the functions of various kinds of ion channels. In this work, we investigate if Dex affects the gene expressions of the two-pore domain K(+) channels in the PDL fibroblasts. We also examined the effects of other steroid hormones on the K(+) channels gene expression. The mRNA levels of two-pore domain K(+) channels in human PDL fibroblasts were examined in the presence or absence of Dex by RT-PCR. The effects of other steroid hormones (aldosterone, estrogen, 1α,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)], and retinoic acid) were also examined. Dex significantly induced the expression of TASK-1 and TWIK-2 in mRNA levels in both a dose- and a time-dependent manner. The stimulatory effects of Dex were completely abolished by a glucocorticoid receptor antagonist. 1,25-(OH)(2)D(3) also increased the TASK-1 mRNA levels but had no effect on TWIK-2 expression. Dex, one of the potent glucocorticoid, probably have a protective role against external stimuli by maintaining the membrane potential of PDL fibroblasts through the up-regulation of TASK-1 and TWIK-2 K(+) channels.
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Affiliation(s)
- Takahiro Yamamoto
- Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science, Otsu, Shiga 520-2192, Japan.
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Mizuno M, Takeba Y, Matsumoto N, Tsuzuki Y, Asoh K, Takagi M, Kobayashi S, Yamamoto H. Antenatal glucocorticoid therapy accelerates ATP production with creatine kinase increase in the growth-enhanced fetal rat heart. Circ J 2009; 74:171-80. [PMID: 19952437 DOI: 10.1253/circj.cj-09-0311] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Previous study has demonstrated the increase of several cardiac function-related proteins, including creatine kinase (CK) as an important enzyme in the process of ATP synthesis in the fetal heart of rats administered glucocorticoid (GC) antenatally. In the present study the effect of antenatal GC administration on the CK expression in fetal and neonatal hearts was demonstrated. METHODS AND RESULTS Dexamethasone was administered to pregnant rats on days 19 and 20 of gestation. The mRNA levels of the CK isoforms, CK-M and Mi-CK, in 21-day-old fetal and 1-day-old neonatal hearts were significantly increased after antenatal GC administration. CK protein levels were also increased in both cultured cardiomyocytes and the mitochondria of the hearts. Uptake of 5, 5', 6, 6'-tetrachloro-1, 1', 3, 3'-tetraethyl-benzimidazolocarbocyanine iodide by mitochondria was significantly increased. An increased ATP level accompanied the CK increase in the neonatal hearts. Furthermore, in vitro these effects were mediated though the GC receptor of cardiomyocytes. Peroxisome proliferator-activated receptor gamma as the upstream transcription factor of CK was significantly increased in fetal hearts. CONCLUSIONS These results suggest that antenatal GC administration accelerates ATP synthesis through increased CK and may contribute to maturation of the premature heart so that it is ready for preterm delivery. (Circ J 2010; 74: 171 - 180).
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Affiliation(s)
- Masanori Mizuno
- Department of Pediatrics, St Marianna University School of Medicine, Japan.
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BenMohamed F, Ruchon Y, Capuano V, Renaud JF. Identification of functional corticosteroid response elements involved in regulation of Cacna1g expression in cardiac myocytes. Mol Cell Biochem 2009; 335:47-51. [PMID: 19705257 DOI: 10.1007/s11010-009-0239-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2009] [Accepted: 08/13/2009] [Indexed: 10/20/2022]
Abstract
We recently reported that corticosteroids increase the expression of the T-type channel Ca(v)3.1 through a transcriptional up-regulation of the Ca(v)3.1 encoding gene cacna1g. The nucleotide sequence analysis of cacna1g promoter revealed putative glucocorticoid response elements (GREs). However, the functional GREs involved in the regulation of cacna1g expression in neonatal cardiac myocytes are unknown. In the present study we have investigated the nuclear targets responsible for the transcriptional regulation of cacna1g. We identified five GREs from the nucleotide sequence of cacna1g promoter. Additionally, using punctual mutagenesis approach, three functional categories of GREs have been identified: (i) GRE-1 involved in promoter activity induced by aldosterone (Aldo, 1 microM); (ii) GRE-4 and GRE-5 involved in promoter activity induced by dexamethasone (Dex, 1 microM); and (iii) GRE-2 and GRE-3 involved in the basal level of neonatal promoter activity. The data presented here lead to better understanding of the molecular mechanisms underlying the regulation of Ca(v)3.1 channel expression by corticosteroids. These new findings have attractive physiological features during cardiac development and pathology such as arrhythmias.
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Affiliation(s)
- Fatima BenMohamed
- CNRS UMR 8162, Université Paris-Sud XI, Hôpital Marie Lannelongue, 133 Avenue de la Résistance, 92350 Le Plessis Robinson, France.
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