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Zhang L, Wu X, Cao X, Rao K, Hong L. Trp207 regulation of voltage-dependent activation of human H v1 proton channel. J Biol Chem 2024; 300:105674. [PMID: 38272234 PMCID: PMC10875263 DOI: 10.1016/j.jbc.2024.105674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/08/2024] [Accepted: 01/13/2024] [Indexed: 01/27/2024] Open
Abstract
In voltage-gated Na+ and K+ channels, the hydrophobicity of noncharged residues in the S4 helix has been shown to regulate the S4 movement underlying the process of voltage-sensing domain (VSD) activation. In voltage-gated proton channel Hv1, there is a bulky noncharged tryptophan residue located at the S4 transmembrane segment. This tryptophan remains entirely conserved across all Hv1 members but is not seen in other voltage-gated ion channels, indicating that the tryptophan contributes different roles in VSD activation. The conserved tryptophan of human voltage-gated proton channel Hv1 is Trp207 (W207). Here, we showed that W207 modifies human Hv1 voltage-dependent activation, and small residues replacement at position 207 strongly perturbs Hv1 channel opening and closing, and the size of the side chain instead of the hydrophobic group of W207 regulates the transition between closed and open states of the channel. We conclude that the large side chain of tryptophan controls the energy barrier during the Hv1 VSD transition.
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Affiliation(s)
- Lu Zhang
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Xin Wu
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Xinyu Cao
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA; Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Khushi Rao
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA; Department of Biological Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Liang Hong
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA; Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, Illinois, USA; Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois, USA.
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2
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Wu X, Singla S, Liu JJ, Hong L. The role of macrophage ion channels in the progression of atherosclerosis. Front Immunol 2023; 14:1225178. [PMID: 37588590 PMCID: PMC10425548 DOI: 10.3389/fimmu.2023.1225178] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/10/2023] [Indexed: 08/18/2023] Open
Abstract
Atherosclerosis is a complex inflammatory disease that affects the arteries and can lead to severe complications such as heart attack and stroke. Macrophages, a type of immune cell, play a crucial role in atherosclerosis initiation and progression. Emerging studies revealed that ion channels regulate macrophage activation, polarization, phagocytosis, and cytokine secretion. Moreover, macrophage ion channel dysfunction is implicated in macrophage-derived foam cell formation and atherogenesis. In this context, exploring the regulatory role of ion channels in macrophage function and their impacts on the progression of atherosclerosis emerges as a promising avenue for research. Studies in the field will provide insights into novel therapeutic targets for the treatment of atherosclerosis.
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Affiliation(s)
- Xin Wu
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Sidhant Singla
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Jianhua J. Liu
- Department of Pathology, University of Illinois at Chicago, Chicago, IL, United States
| | - Liang Hong
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, United States
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3
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Leung J, Lee S, Zhou J, Jeevaratnam K, Lakhani I, Radford D, Coakley-Youngs E, Pay L, Çinier G, Altinsoy M, Behnoush AH, Mahmoudi E, Matusik PT, Bazoukis G, Garcia-Zamora S, Zeng S, Chen Z, Xia Y, Liu T, Tse G. Clinical Characteristics, Genetic Findings and Arrhythmic Outcomes of Patients with Catecholaminergic Polymorphic Ventricular Tachycardia from China: A Systematic Review. LIFE (BASEL, SWITZERLAND) 2022; 12:life12081104. [PMID: 35892906 PMCID: PMC9330865 DOI: 10.3390/life12081104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/12/2022] [Accepted: 07/19/2022] [Indexed: 11/16/2022]
Abstract
INTRODUCTION Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare inherited cardiac ion channelopathy. The present study aims to examine the clinical characteristics, genetic basis, and arrhythmic outcomes of CPVT patients from China to elucidate the difference between CPVT patients in Asia and Western countries. METHODS PubMed and Embase were systematically searched for case reports or series reporting on CPVT patients from China until 19 February 2022 using the keyword: "Catecholaminergic Polymorphic Ventricular Tachycardia" or "CPVT", with the location limited to: "China" or "Hong Kong" or "Macau" in Embase, with no language or publication-type restriction. Articles that did not state a definite diagnosis of CPVT and articles with duplicate cases found in larger cohorts were excluded. All the included publications in this review were critically appraised based on the Joanna Briggs Institute Critical Appraisal Checklist. Clinical characteristics, genetic findings, and the primary outcome of spontaneous ventricular tachycardia/ventricular fibrillation (VT/VF) were analyzed. RESULTS A total of 58 unique cases from 15 studies (median presentation age: 8 (5.0-11.8) years old) were included. All patients, except one, presented at or before 19 years of age. There were 56 patients (96.6%) who were initially symptomatic. Premature ventricular complexes (PVCs) were present in 44 out of 51 patients (86.3%) and VT in 52 out of 58 patients (89.7%). Genetic tests were performed on 54 patients (93.1%) with a yield of 87%. RyR2, CASQ2, TERCL, and SCN10A mutations were found in 35 (71.4%), 12 (24.5%), 1 (0.02%) patient, and 1 patient (0.02%), respectively. There were 54 patients who were treated with beta-blockers, 8 received flecainide, 5 received amiodarone, 2 received verapamil and 2 received propafenone. Sympathectomy (n = 10), implantable cardioverter-defibrillator implantation (n = 8) and ablation (n = 1) were performed. On follow-up, 13 patients developed VT/VF. CONCLUSION This was the first systematic review of CPVT patients from China. Most patients had symptoms on initial presentation, with syncope as the presenting complaint. RyR2 mutation accounts for more than half of the CPVT cases, followed by CASQ2, TERCL and SCN10A mutations.
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Affiliation(s)
- Justin Leung
- Cardiac Electrophysiology Unit, Cardiovascular Analytics Group, China-UK Collaboration, Hong Kong, China; (J.L.); (S.L.); (I.L.)
| | - Sharen Lee
- Cardiac Electrophysiology Unit, Cardiovascular Analytics Group, China-UK Collaboration, Hong Kong, China; (J.L.); (S.L.); (I.L.)
| | - Jiandong Zhou
- School of Data Science, City University of Hong Kong, Hong Kong, China;
| | - Kamalan Jeevaratnam
- Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK;
| | - Ishan Lakhani
- Cardiac Electrophysiology Unit, Cardiovascular Analytics Group, China-UK Collaboration, Hong Kong, China; (J.L.); (S.L.); (I.L.)
| | - Danny Radford
- Kent and Medway Medical School, Canterbury CT2 7FS, UK; (D.R.); (E.C.-Y.)
| | | | - Levent Pay
- Department of Cardiology, Dr Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul 34147, Turkey; (L.P.); (G.Ç.)
| | - Göksel Çinier
- Department of Cardiology, Dr Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul 34147, Turkey; (L.P.); (G.Ç.)
| | - Meltem Altinsoy
- Department of Cardiology, University of Health Sciences, Diskapi Yildirim Beyazit Training and Research Hospital, Ankara 06145, Turkey;
| | - Amir Hossein Behnoush
- Universal Scientific Education and Research Network (USERN), Tehran University of Medical Sciences, Tehran 1416643931, Iran; (A.H.B.); (E.M.)
| | - Elham Mahmoudi
- Universal Scientific Education and Research Network (USERN), Tehran University of Medical Sciences, Tehran 1416643931, Iran; (A.H.B.); (E.M.)
| | - Paweł T. Matusik
- Department of Electrocardiology, Institute of Cardiology, Jagiellonian University Medical College, John Paul II Hospital, 31-202 Kraków, Poland;
| | - George Bazoukis
- Department of Cardiology, Larnaca General Hospital, Larnaca 6301, Cyprus;
- Medical School, University of Nicosia, Nicosia 2408, Cyprus
| | - Sebastian Garcia-Zamora
- Cardiac Intensive Care Unit, Department of Cardiology, Delta Clinic, Rosario S2000, Argentina;
| | - Shaoying Zeng
- Department of Pediatric Cardiology, Guangdong Cardiovascular Institute, Guangdong Provincial Key Laboratory of South China Structural Heart Disease, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China;
| | - Ziliang Chen
- Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular Disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin 300211, China;
| | - Yunlong Xia
- Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian 116014, China;
| | - Tong Liu
- Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular Disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin 300211, China;
- Correspondence: (T.L.); or or (G.T.)
| | - Gary Tse
- Cardiac Electrophysiology Unit, Cardiovascular Analytics Group, China-UK Collaboration, Hong Kong, China; (J.L.); (S.L.); (I.L.)
- Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK;
- Kent and Medway Medical School, Canterbury CT2 7FS, UK; (D.R.); (E.C.-Y.)
- Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular Disease, Department of Cardiology, Tianjin Institute of Cardiology, Second Hospital of Tianjin Medical University, Tianjin 300211, China;
- Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian 116014, China;
- Correspondence: (T.L.); or or (G.T.)
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Wu X, Li Y, Hong L. Effects of Mexiletine on a Race-specific Mutation in Nav1.5 Associated With Long QT Syndrome. Front Physiol 2022; 13:904664. [PMID: 35864896 PMCID: PMC9294368 DOI: 10.3389/fphys.2022.904664] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 06/14/2022] [Indexed: 11/13/2022] Open
Abstract
The voltage-gated sodium channel Nav1.5 plays an essential role in the generation and propagation of action potential in cardiomyocytes. Mutations in Nav1.5 have been associated with LQT syndrome, Brugada syndrome, and sudden arrhythmia death syndrome. Genetic studies showed that Nav1.5 mutations vary across race-ethnic groups. Here we investigated an Asian-specific mutation Nav1.5-P1090L associated with LQT syndrome. We found that Nav1.5-P1090L mutation perturbed the sodium channel function. It altered the gating process of the channel and exhibited an enhanced window current. Treatment with mexiletine reversed the depolarization shift of the steady-state inactivation produced by P1090L. Mexiletine also modified the recovery from steady-state inactivation and the development of inactivation of P1090L. It rescued the dysfunctional inactivation of P1090L and reduced the P1090L channel’s availability.
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Affiliation(s)
- Xin Wu
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Yawei Li
- Department of Preventive Medicine, Northwestern University, Chicago, IL, United States
| | - Liang Hong
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
- *Correspondence: Liang Hong,
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5
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Wu X, Li Y, Maienschein-Cline M, Feferman L, Wu L, Hong L. RNA-Seq Analyses Reveal Roles of the HVCN1 Proton Channel in Cardiac pH Homeostasis. Front Cell Dev Biol 2022; 10:860502. [PMID: 35372367 PMCID: PMC8967321 DOI: 10.3389/fcell.2022.860502] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 02/16/2022] [Indexed: 12/13/2022] Open
Abstract
The voltage-gated proton channel HVCN1 is a member of the voltage-gated ion channel family. HVCN1 channel controls acid extrusion and regulates pH homeostasis in various cell types. Recent evidence indicated that the HVCN1 channel was associated with cardiac function. To investigate the role of HVCN1 in cardiac myocytes, we performed an RNA sequencing analysis of murine hearts and showed that HVCN1 null hearts exhibited a differential transcriptome profile compared with wild-type hearts. The RNA-seq data indicating impaired pH homeostasis in HVCN1 null hearts were the downregulated NADPH oxidoreductases (NOXs) and decreased expression of Cl−/HCO3− exchanger, indicating HVCN1 is a regulator of gene transcriptional networks controlling NOX signaling and CO2 homeostasis in the heart. Additionally, HVCN1 null hearts exhibited differential expression of cardiac ion channels, suggesting a potential role of HVCN1 in cardiac electrophysiological remodeling. The study highlights the importance of HVCN1 in cardiac function and may present a novel target associated with heart diseases.
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Affiliation(s)
- Xin Wu
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
| | - Yawei Li
- Department of Preventive Medicine, Northwestern University, Chicago, IL, United States
| | - Mark Maienschein-Cline
- Research Informatics Core, Research Resources Center, University of Illinois at Chicago, Chicago, IL, United States
| | - Leonid Feferman
- Research Informatics Core, Research Resources Center, University of Illinois at Chicago, Chicago, IL, United States
| | - Longjun Wu
- Department of Neurology, Mayo Clinic, Rochester, MN, United States
| | - Liang Hong
- Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
- *Correspondence: Liang Hong,
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6
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Graham RD, Jhand AS, Lempka SF. Dorsal root ganglion stimulation produces differential effects on action potential propagation across a population of biophysically distinct C-neurons. FRONTIERS IN PAIN RESEARCH 2022; 3:1017344. [PMID: 36387415 PMCID: PMC9643723 DOI: 10.3389/fpain.2022.1017344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 10/03/2022] [Indexed: 11/05/2022] Open
Abstract
Dorsal root ganglion stimulation (DRGS) is a neurostimulation therapy used to manage chronic pain that does not respond to conventional therapies. Unfortunately, not all patients receive sufficient pain relief from DRGS, leaving them with few other treatment options. Presently, our understanding of the mechanisms of action of DRGS is incomplete, preventing us from determining why some patients do not receive analgesia from the therapy. One hypothesis suggests that DRGS augments the filtering of action potentials (APs) at the T-junction of nociceptive C-neurons. To test this hypothesis, we utilized a computational modeling approach in which we developed a population of one thousand biophysically distinct C-neuron models which each produced electrophysiological characteristics (e.g., AP height, AP duration) reported in previous experimental studies. We used this population of model C-neurons to study how morphological and electrophysiological characteristics affected the propagation of APs through the T-junction. We found that trains of APs can propagate through the T-junction in the orthodromic direction at a higher frequency than in the antidromic direction due to the decrease in axonal diameter from the peripheral to spinal axon. Including slow outward conductances in the axonal compartments near the T-junction reduced following frequencies to ranges measured experimentally. We next used the population of C-neuron models to investigate how DRGS affected the orthodromic propagation of APs through the T-junction. Our data suggest that suprathreshold DRGS augmented the filtering of APs at the T-junction of some model C-neurons while increasing the activity of other model C-neurons. However, the stimulus pulse amplitudes required to induce activity in C-neurons (i.e., several mA) fell outside the range of stimulation pulse amplitudes used clinically (i.e., typically ≤1 mA). Furthermore, our data suggest that somatic GABA currents activated directly or indirectly by the DRGS pulse may produce diverse effects on orthodromic AP propagation in C-neurons. These data suggest DRGS may produce differential effects across a population of C-neurons and indicate that understanding how inherent biological variability affects a neuron's response to therapeutic electrical stimulation may be helpful in understanding its mechanisms of action.
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Affiliation(s)
- Robert D Graham
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, United States
| | - Amolak S Jhand
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, United States
| | - Scott F Lempka
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States.,Biointerfaces Institute, University of Michigan, Ann Arbor, MI, United States.,Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
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7
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Wu X, Hong L. Calmodulin Interactions with Voltage-Gated Sodium Channels. Int J Mol Sci 2021; 22:ijms22189798. [PMID: 34575961 PMCID: PMC8472079 DOI: 10.3390/ijms22189798] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 02/06/2023] Open
Abstract
Calmodulin (CaM) is a small protein that acts as a ubiquitous signal transducer and regulates neuronal plasticity, muscle contraction, and immune response. It interacts with ion channels and plays regulatory roles in cellular electrophysiology. CaM modulates the voltage-gated sodium channel gating process, alters sodium current density, and regulates sodium channel protein trafficking and expression. Many mutations in the CaM-binding IQ domain give rise to diseases including epilepsy, autism, and arrhythmias by interfering with CaM interaction with the channel. In the present review, we discuss CaM interactions with the voltage-gated sodium channel and modulators involved in CaM regulation, as well as summarize CaM-binding IQ domain mutations associated with human diseases in the voltage-gated sodium channel family.
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Hong L, Zhang M, Ly OT, Chen H, Sridhar A, Lambers E, Chalazan B, Youn SW, Maienschein-Cline M, Feferman L, Ong SG, Wu JC, Rehman J, Darbar D. Human induced pluripotent stem cell-derived atrial cardiomyocytes carrying an SCN5A mutation identify nitric oxide signaling as a mediator of atrial fibrillation. Stem Cell Reports 2021; 16:1542-1554. [PMID: 34019817 PMCID: PMC8190590 DOI: 10.1016/j.stemcr.2021.04.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 04/25/2021] [Accepted: 04/26/2021] [Indexed: 12/13/2022] Open
Abstract
Mutations in SCN5A, encoding the cardiac sodium channel, are linked with familial atrial fibrillation (AF) but the underlying pathophysiologic mechanisms and implications for therapy remain unclear. To characterize the pathogenesis of AF-linked SCN5A mutations, we generated patient-specific induced pluripotent stem cell-derived atrial cardiomyocytes (iPSC-aCMs) from two kindreds carrying SCN5A mutations (E428K and N470K) and isogenic controls using CRISPR-Cas9 gene editing. We showed that mutant AF iPSC-aCMs exhibited spontaneous arrhythmogenic activity with beat-to-beat irregularity, prolonged action potential duration, and triggered-like beats. Single-cell recording revealed enhanced late sodium currents (INa,L) in AF iPSC-aCMs that were absent in a heterologous expression model. Gene expression profiling of AF iPSC-aCMs showed differential expression of the nitric oxide (NO)-mediated signaling pathway underlying enhanced INa,L. We showed that patient-specific AF iPSC-aCMs exhibited striking in vitro electrophysiological phenotype of AF-linked SCN5A mutations, and transcriptomic analyses supported that the NO signaling pathway modulated the INa,L and triggered AF.
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Affiliation(s)
- Liang Hong
- Division of Cardiology, Department of Medicine, Chicago, IL, USA.
| | - Meihong Zhang
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Olivia Thao Ly
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Hanna Chen
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Arvind Sridhar
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Erin Lambers
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Brandon Chalazan
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | - Seock-Won Youn
- Division of Cardiology, Department of Medicine, Chicago, IL, USA
| | | | - Leonid Feferman
- Research Informatics Core, Research Resources Center, Chicago, IL, USA
| | - Sang-Ging Ong
- Division of Cardiology, Department of Medicine, Chicago, IL, USA; Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA
| | - Joseph C Wu
- Stanford Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Jalees Rehman
- Division of Cardiology, Department of Medicine, Chicago, IL, USA; Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA
| | - Dawood Darbar
- Division of Cardiology, Department of Medicine, Chicago, IL, USA; Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA; Jesse Brown Veterans Administration Medical Center, Chicago, IL, USA.
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