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Fan X, Yang G, Yang Z, Uhlig S, Sattler K, Bieback K, Hamdani N, El-Battrawy I, Duerschmied D, Zhou X, Akin I. Catecholamine induces endothelial dysfunction via Angiotensin II and intermediate conductance calcium activated potassium channel. Biomed Pharmacother 2024; 177:116928. [PMID: 38889637 DOI: 10.1016/j.biopha.2024.116928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 06/06/2024] [Accepted: 06/09/2024] [Indexed: 06/20/2024] Open
Abstract
Endothelial dysfunction contributes to the pathogenesis of Takotsubo syndrome (TTS). However, the exact mechanism underlying endothelial dysfunction in the setting of TTS has not been completely clarified. This study aims to investigate the roles of angiotensin II (Ang II) and intermediate-conductance Ca2+-activated K+ (SK4) channels in catecholamine-induced endothelial dysfunction. Human cardiac microvascular endothelial cells (HCMECs) were exposed to 100 µM epinephrine (Epi), mimicking the setting of TTS. Epi treatment increased the ET-1 concentration and reduced NO levels in HCMECs. Importantly, the effects of Epi were found to be mitigated in the presence of Ang II receptor blockers. Furthermore, Ang II mimicked Epi effects on ET-1 and NO production. Additionally, Ang II inhibited tube formation and increased cell apoptosis. The effects of Ang II could be reversed by an SK4 activator NS309 and mimicked by an SK4 channel blocker TRAM-34. Ang II also inhibited the SK4 channel current (ISK4) without affecting its expression level. Ang II could depolarize the cell membrane potential. Ang II promoted ROS release and reduced protein kinase A (PKA) expression. A ROS blocker prevented Ang II effect on ISK4. The PKA activator Sp-8-Br-cAMPS increased SK4 channel currents. Epinephrine enhanced the activity of ACE by activating the α1 receptor/Gq/PKC signal pathway, thereby promoting the secretion of Ang II. The study suggested that high-level catecholamine can increase Ang II release from endothelial cells by α1 receptors/Gq/PKC signal pathway. Ang II can inhibit SK4 channel current by increasing ROS generation and reducing PKA expression, thereby contributing to endothelial dysfunction.
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Affiliation(s)
- Xuehui Fan
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China; European Center for AngioScience (ECAS) and German Center for Cardiovascular Research (DZHK) partner site Heidelberg/Mannheim, Mannheim, Germany; Department of Cardiology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Guoqiang Yang
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Acupuncture and Rehabilitation Department, The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou 646000, China
| | - Zhen Yang
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany
| | - Stefanie Uhlig
- Flow Core Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Katherine Sattler
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Karen Bieback
- Flow Core Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany; Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Nazha Hamdani
- Institute of Physiology, Department of Cellular and Translational Physiology, Medical Faculty, Ruhr University Bochum, Bochum, Germany; Institut für Forschung und Lehre (IFL), Molecular and Experimental Cardiology, Ruhr University Bochum, Bochum, Germany; Department of Cardiology and Angiology, Bergmannsheil University Hospital, Ruhr University Bochum, Bochum, Germany
| | - Ibrahim El-Battrawy
- Institute of Physiology, Department of Cellular and Translational Physiology, Medical Faculty, Ruhr University Bochum, Bochum, Germany; Institut für Forschung und Lehre (IFL), Molecular and Experimental Cardiology, Ruhr University Bochum, Bochum, Germany; Department of Cardiology and Angiology, Bergmannsheil University Hospital, Ruhr University Bochum, Bochum, Germany
| | - Daniel Duerschmied
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
| | - Xiaobo Zhou
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China; European Center for AngioScience (ECAS) and German Center for Cardiovascular Research (DZHK) partner site Heidelberg/Mannheim, Mannheim, Germany; Department of Cardiology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Ibrahim Akin
- Department of Cardiology, Angiology, Hemostaseology and Medical Intensive Care, Medical Faculty Mannheim, University Medical Centre Mannheim (UMM), Heidelberg University, Mannheim, Germany; Key Laboratory of Medical Electrophysiology of the Ministry of Education, Medical Electrophysiological Key Laboratory of Sichuan Province, Institute of Cardiovascular Research, Southwest Medical University, Luzhou, Sichuan, China
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Sagris M, Apostolos A, Theofilis P, Ktenopoulos N, Katsaros O, Tsalamandris S, Tsioufis K, Toutouzas K, Tousoulis D. Myocardial Ischemia-Reperfusion Injury: Unraveling Pathophysiology, Clinical Manifestations, and Emerging Prevention Strategies. Biomedicines 2024; 12:802. [PMID: 38672157 PMCID: PMC11048318 DOI: 10.3390/biomedicines12040802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/02/2024] [Accepted: 03/29/2024] [Indexed: 04/28/2024] Open
Abstract
Myocardial ischemia-reperfusion injury (MIRI) remains a challenge in the context of reperfusion procedures for myocardial infarction (MI). While early revascularization stands as the gold standard for mitigating myocardial injury, recent insights have illuminated the paradoxical role of reperfusion, giving rise to the phenomenon known as ischemia-reperfusion injury. This comprehensive review delves into the intricate pathophysiological pathways involved in MIRI, placing a particular focus on the pivotal role of endothelium. Beyond elucidating the molecular intricacies, we explore the diverse clinical manifestations associated with MIRI, underscoring its potential to contribute substantially to the final infarct size, up to 50%. We further navigate through current preventive approaches and highlight promising emerging strategies designed to counteract the devastating effects of the phenomenon. By synthesizing current knowledge and offering a perspective on evolving preventive interventions, this review serves as a valuable resource for clinicians and researchers engaged in the dynamic field of MIRI.
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Affiliation(s)
- Marios Sagris
- Correspondence: ; Tel.: +30-213-2088099; Fax: +30-2132088676
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Xing H, Sabe SA, Shi G, Harris DD, Liu Y, Sellke FW, Feng J. Role of Protein Kinase C in Metabolic Regulation of Coronary Endothelial Small Conductance Calcium-Activated Potassium Channels. J Am Heart Assoc 2024; 13:e031028. [PMID: 38293916 PMCID: PMC11056132 DOI: 10.1161/jaha.123.031028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 11/02/2023] [Indexed: 02/01/2024]
Abstract
BACKGROUND Small conductance calcium-activated potassium (SK) channels are largely responsible for endothelium-dependent coronary arteriolar relaxation. Endothelial SK channels are downregulated by the reduced form of nicotinamide adenine dinucleotide (NADH), which is increased in the setting of diabetes, yet the mechanisms of these changes are unclear. PKC (protein kinase C) is an important mediator of diabetes-induced coronary endothelial dysfunction. Thus, we aimed to determine whether NADH signaling downregulates endothelial SK channel function via PKC. METHODS AND RESULTS SK channel currents of human coronary artery endothelial cells were measured by whole cell patch clamp method in the presence/absence of NADH, PKC activator phorbol 12-myristate 13-acetate, PKC inhibitors, or endothelial PKCα/PKCβ knockdown by using small interfering RNA. Human coronary arteriolar reactivity in response to the selective SK activator NS309 was measured by vessel myography in the presence of NADH and PKCβ inhibitor LY333531. NADH (30-300 μmol/L) or PKC activator phorbol 12-myristate 13-acetate (30-300 nmol/L) reduced endothelial SK current density, whereas the selective PKCᵦ inhibitor LY333531 significantly reversed the NADH-induced SK channel inhibition. PKCβ small interfering RNA, but not PKCα small interfering RNA, significantly prevented the NADH- and phorbol 12-myristate 13-acetate-induced SK inhibition. Incubation of human coronary artery endothelial cells with NADH significantly increased endothelial PKC activity and PKCβ expression and activation. Treating vessels with NADH decreased coronary arteriolar relaxation in response to the selective SK activator NS309, and this inhibitive effect was blocked by coadministration with PKCβ inhibitor LY333531. CONCLUSIONS NADH-induced inhibition of endothelial SK channel function is mediated via PKCβ. These findings may provide insight into novel therapeutic strategies to preserve coronary microvascular function in patients with metabolic syndrome and coronary disease.
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Affiliation(s)
- Hang Xing
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Sharif A. Sabe
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Guangbin Shi
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Dwight D. Harris
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Yuhong Liu
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Frank W. Sellke
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
| | - Jun Feng
- Division of Cardiothoracic Surgery, Rhode Island HospitalAlpert Medical School of Brown UniversityProvidenceRI
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The Long-Term Effects of Prenatal Hypoxia on Coronary Artery Function of the Male and Female Offspring. Biomedicines 2022; 10:biomedicines10123019. [PMID: 36551775 PMCID: PMC9776081 DOI: 10.3390/biomedicines10123019] [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: 10/18/2022] [Revised: 11/18/2022] [Accepted: 11/19/2022] [Indexed: 11/25/2022] Open
Abstract
Prenatal hypoxia predisposes the offspring to the development of cardiovascular (CV) dysfunction in adult life. Using a rat model, we assessed the effect of prenatal hypoxia on vasoconstrictive and vasodilative mechanisms in left anterior descending coronary arteries of 4- and 9.5-month-old offspring. Endothelium-dependent relaxation to methylcholine and vasoconstriction responses to endothelin-1 (ET-1) were assessed by wire myography. Prenatal hypoxia impaired endothelium-dependent vasodilation in 4- and 9.5-month-old offspring. Inhibition of nitric oxide (NO) synthase prevented coronary artery relaxation in all groups. Inhibition of prostaglandin H synthase (PGHS) improved relaxation in prenatally hypoxic males and tended to improve vasorelaxation in females, suggesting that impaired vasodilation was mediated via increased PGHS-dependent vasoconstriction. An enhanced contribution of endothelium-dependent hyperpolarization to coronary artery vasodilation was observed in prenatally hypoxic males and females. No changes in endothelial NO synthase (eNOS) and PGHS-1 expressions were observed, while PGHS-2 expression was decreased in only prenatally hypoxic males. At 4 months, ET-1 responses were similar between groups, while ETB inhibition (with BQ788) tended to decrease ET-1-mediated responses in only prenatally hypoxic females. At 9.5 months, ET-1-mediated responses were decreased in only prenatally hypoxic females. Our data suggest that prenatal hypoxia has long-term similar effects on the mechanisms of impaired endothelium-dependent vasodilation in coronary arteries from adult male and female offspring; however, coronary artery contractile capacity is impaired only in prenatally hypoxic females. Understanding the mechanistic pathways involved in the programming of CV disease may allow for the development of therapeutic interventions.
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Song Y, Xing H, He Y, Zhang Z, Shi G, Wu S, Liu Y, Harrington EO, Sellke FW, Feng J. Inhibition of mitochondrial reactive oxygen species improves coronary endothelial function after cardioplegic hypoxia/reoxygenation. J Thorac Cardiovasc Surg 2022; 164:e207-e226. [PMID: 34274141 PMCID: PMC8710187 DOI: 10.1016/j.jtcvs.2021.06.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 05/16/2021] [Accepted: 06/10/2021] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Cardioplegic ischemia-reperfusion and diabetes mellitus are correlated with coronary endothelial dysfunction and inactivation of small conductance calcium-activated potassium channels. Increased reactive oxidative species, such as mitochondrial reactive oxidative species, may contribute to oxidative injury. Thus, we hypothesized that inhibition of mitochondrial reactive oxidative species may protect coronary small conductance calcium-activated potassium channels and endothelial function against cardioplegic ischemia-reperfusion-induced injury. METHODS Small coronary arteries and endothelial cells from the hearts of mice with and without diabetes mellitus were isolated and examined by using a cardioplegic hypoxia and reoxygenation model to determine whether the mitochondria-targeted antioxidant Mito-Tempo could protect against coronary endothelial and small conductance calcium-activated potassium channel dysfunction. The microvessels or mouse heart endothelial cells were treated with or without Mito-Tempo (0-10 μM) 5 minutes before and during cardioplegic hypoxia and reoxygenation. Microvascular function was assessed in vitro by vessel myography. K+ currents of mouse heart endothelial cells were measured by whole-cell patch clamp. The levels of intracellular cytosolic free calcium (Ca2+) concentration, mitochondrial reactive oxidative species, and small conductance calcium-activated potassium protein expression of mouse heart endothelial cells were measured by Rhod-2 fluorescence staining, MitoSox, and Western blotting, respectively. RESULTS Cardioplegic hypoxia and reoxygenation significantly attenuated endothelial small conductance calcium-activated potassium channel activity, caused calcium overload, and increased mitochondrial reactive oxidative species of mouse heart endothelial cells in both the nondiabetic and diabetes mellitus groups. In addition, treating mouse heart endothelial cells with Mito-Tempo (10 μM) reduced cardioplegic hypoxia and reoxygenation-induced Ca2+ and mitochondrial reactive oxidative species overload in both the nondiabetic and diabetes mellitus groups, respectively (P < .05). Treatment with Mito-Tempo (10 μM) significantly enhanced coronary relaxation responses to adenosine 5'-diphosphate and NS309 (P < .05), and endothelial small conductance calcium-activated potassium channel currents in both the nondiabetic and diabetes mellitus groups (P < .05). CONCLUSIONS Administration of Mito-Tempo improves endothelial function and small conductance calcium-activated potassium channel activity, which may contribute to its enhancement of endothelium-dependent vasorelaxation after cardioplegic hypoxia and reoxygenation.
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Affiliation(s)
- Yi Song
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Hang Xing
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Yixin He
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Zhiqi Zhang
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Guangbin Shi
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Su Wu
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Yuhong Liu
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Elizabeth O Harrington
- Department of Medicine, Vascular Research Laboratory, Providence VA Medical Center, Alpert Medical School of Brown University, Providence, RI
| | - Frank W Sellke
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI
| | - Jun Feng
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI.
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Sytha SP, Self TS, Heaps CL. K + channels in the coronary microvasculature of the ischemic heart. CURRENT TOPICS IN MEMBRANES 2022; 90:141-166. [PMID: 36368873 PMCID: PMC10494550 DOI: 10.1016/bs.ctm.2022.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Ischemic heart disease is the leading cause of death and a major public health and economic burden worldwide with expectations of predicted growth in the foreseeable future. It is now recognized clinically that flow-limiting stenosis of the large coronary conduit arteries as well as microvascular dysfunction in the absence of severe stenosis can each contribute to the etiology of ischemic heart disease. The primary site of coronary vascular resistance, and control of subsequent coronary blood flow, is found in the coronary microvasculature, where small changes in radius can have profound impacts on myocardial perfusion. Basal active tone and responses to vasodilators and vasoconstrictors are paramount in the regulation of coronary blood flow and adaptations in signaling associated with ion channels are a major factor in determining alterations in vascular resistance and thereby myocardial blood flow. K+ channels are of particular importance as contributors to all aspects of the regulation of arteriole resistance and control of perfusion into the myocardium because these channels dictate membrane potential, the resultant activity of voltage-gated calcium channels, and thereby, the contractile state of smooth muscle. Evidence also suggests that K+ channels play a significant role in adaptations with cardiovascular disease states. In this review, we highlight our research examining the role of K+ channels in ischemic heart disease and adaptations with exercise training as treatment, as well as how our findings have contributed to this area of study.
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Affiliation(s)
- Sharanee P Sytha
- Department of Physiology and Pharmacology, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States
| | - Trevor S Self
- Department of Physiology and Pharmacology, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States
| | - Cristine L Heaps
- Department of Physiology and Pharmacology, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States; Michael E. DeBakey Institute for Comparative Cardiovascular Science and Biomedical Devices, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States.
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Functional Characterization of Human Induced Pluripotent Stem Cell-Derived Endothelial Cells. Int J Mol Sci 2022; 23:ijms23158507. [PMID: 35955642 PMCID: PMC9368986 DOI: 10.3390/ijms23158507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/27/2022] [Accepted: 07/29/2022] [Indexed: 12/03/2022] Open
Abstract
Endothelial cells derived from human induced pluripotent stem cells (hiPSC-ECs) provide a new opportunity for mechanistic research on vascular regeneration and drug screening. However, functions of hiPSC-ECs still need to be characterized. The objective of this study was to investigate electrophysiological and functional properties of hiPSC-ECs compared with primary human cardiac microvascular endothelial cells (HCMECs), mainly focusing on ion channels and membrane receptor signaling, as well as specific cell functions. HiPSC-ECs were derived from hiPS cells that were generated from human skin fibroblasts of three independent healthy donors. Phenotypic and functional comparison to HCMECs was performed by flow cytometry, immunofluorescence staining, quantitative reverse-transcription polymerase chain reaction (qPCR), enzyme-linked immunosorbent assay (ELISA), tube formation, LDL uptake, exosome release assays and, importantly, patch clamp techniques. HiPSC-ECs were successfully generated from hiPS cells and were identified by endothelial markers. The mRNA levels of KCNN2, KCNN4, KCNMA1, TRPV2, and SLC8A1 in hiPSC-ECs were significantly higher than HCMECs. AT1 receptor mRNA level in hiPSC-ECs was higher than in HCMECs. AT2 receptor mRNA level was the highest among all receptors. Adrenoceptor ADRA2 expression in hiPSC-ECs was lower than in HCMECs, while ADRA1, ADRB1, ADRB2, and G-protein GNA11 and Gai expression were similar in both cell types. The expression level of muscarinic and dopamine receptors CHRM3, DRD2, DRD3, and DRD4 in hiPSC-ECs were significantly lower than in HCMECs. The functional characteristics of endothelial cells, such as tube formation and LDL uptake assay, were not statistically different between hiPSC-ECs and HCMECs. Phenylephrine similarly increased the release of the vasoconstrictor endothelin-1 (ET-1) in hiPSC-ECs and HCMECs. Acetylcholine also similarly increased nitric oxide generation in hiPSC-ECs and HCMECs. The resting potentials (RPs), ISK1–3, ISK4 and IK1 were similar in hiPSC-ECs and HCMECs. IBK was larger and IKATP was smaller in hiPSC-ECs. In addition, we also noted a higher expression level of exosomes marker CD81 in hiPSC-ECs and a higher expression of CD9 and CD63 in HCMECs. However, the numbers of exosomes extracted from both types of cells did not differ significantly. The study demonstrates that hiPSC-ECs are similar to native endothelial cells in ion channel function and membrane receptor-coupled signaling and physiological cell functions, although some differences exist. This information may be helpful for research using hiPSC-ECs.
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Metabolic regulation and dysregulation of endothelial small conductance calcium activated potassium channels. Eur J Cell Biol 2022; 101:151208. [DOI: 10.1016/j.ejcb.2022.151208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/06/2022] [Accepted: 02/07/2022] [Indexed: 12/13/2022] Open
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Role of potassium channels in female reproductive system. Obstet Gynecol Sci 2020; 63:565-576. [PMID: 32838485 PMCID: PMC7494774 DOI: 10.5468/ogs.20064] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 06/26/2020] [Indexed: 12/26/2022] Open
Abstract
Potassium channels are widely expressed in most types of cells in living organisms and regulate the functions of a variety of organs, including kidneys, neurons, cardiovascular organs, and pancreas among others. However, the functional roles of potassium channels in the reproductive system is less understood. This mini-review provides information about the localization and functions of potassium channels in the female reproductive system. Five types of potassium channels, which include inward-rectifying (Kir), voltage-gated (Kv), calcium-activated (KCa), 2-pore domain (K2P), and rapidly-gating sodium-activated (Slo) potassium channels are expressed in the hypothalamus, ovaries, and uterus. Their functions include the regulation of hormone release and feedback by Kir6.1 and Kir6.2, which are expressed in the luteal granulosa cells and gonadotropin-releasing hormone neurons respectively, and regulate the functioning of the hypothalamus–pituitary–ovarian axis and the production of progesterone. Both channels are regulated by subtypes of the sulfonylurea receptor (SUR), Kir6.1/SUR2B and Kir6.2/SUR1. Kv and Slo2.1 affect the transition from uterine quiescence in late pregnancy to the state of strong myometrial contractions in labor. Intermediate- and small-conductance KCa modulate the vasodilatation of the placental chorionic plate resistance arteries via the secretion of nitric oxide and endothelium-derived hyperpolarizing factors. Treatment with specific channel activators and inhibitors provides information relevant for clinical use that could help alter the functions of the female reproductive system.
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Pisarenko O, Studneva I. Modulating the Bioactivity of Nitric Oxide as a Therapeutic Strategy in Cardiac Surgery. J Surg Res 2020; 257:178-188. [PMID: 32835951 DOI: 10.1016/j.jss.2020.07.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/29/2020] [Accepted: 07/11/2020] [Indexed: 12/29/2022]
Abstract
Cardiac surgery, including cardioplegic arrest and extracorporeal circulation, causes endothelial dysfunction, which can lead to no-reflow phenomenon and reduction of myocardial pump function. Nitric oxide (NO) deficiency is involved in this pathologic process, thereby providing a fundamental basis for the use of NO replacement therapy. Presently used drugs and additives to cardioplegic and heart preservation solutions are not able to reliably protect endothelial cells and cardiomyocytes from ischemia-reperfusion injury. This review discusses promising NO-releasing compounds of various chemical classes for cardioplegia and reperfusion, which effectively maintain NO homeostasis under experimental conditions, and presents the mechanisms of their action on the cardiovascular system. Incomplete preclinical studies and a lack of toxicity assessment, however, hinder translation of these drug candidates into the clinic. Perspectives for modulation of endothelial function using NO-mediated mechanisms are discussed. They are based on the cardioprotective potential of targeting vascular gap junctions and endothelial ion channels, intracoronary administration of progenitor cells, and endothelial-specific microRNAs. Some of these strategies may provide important therapeutic benefits for human cardiovascular interventions.
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Affiliation(s)
- Oleg Pisarenko
- National Medical Research Center for Cardiology, Institute of Experimental Cardiology, Moscow, Russian Federation.
| | - Irina Studneva
- National Medical Research Center for Cardiology, Institute of Experimental Cardiology, Moscow, Russian Federation
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Zhang Z, Shi G, Liu Y, Xing H, Kabakov AY, Zhao AS, Agbortoko V, Kim J, Singh AK, Koren G, Harrington EO, Sellke FW, Feng J. Coronary endothelial dysfunction prevented by small-conductance calcium-activated potassium channel activator in mice and patients with diabetes. J Thorac Cardiovasc Surg 2020; 160:e263-e280. [PMID: 32199659 PMCID: PMC7439127 DOI: 10.1016/j.jtcvs.2020.01.078] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 12/30/2019] [Accepted: 01/31/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To investigate coronary endothelial protection of a small-conductance calcium-activated potassium (SK) channel activator against a period of cardioplegic-hypoxia and reoxygenation (CP-H/R) injury in mice and patients with diabetes (DM) and those without diabetes (nondiabetic [ND]). METHODS Mouse small coronary arteries/heart endothelial cells (MHECs) and human coronary arterial endothelial cells (HCAECs) were dissected from the harvested hearts of mice (n = 16/group) and from discarded right atrial tissue samples of patients with DM and without DM (n = 8/group). The SK current density of MHECs was measured. The in vitro small arteries/arterioles, MHECs, and HCAECs were subjected to 60 minutes of CP hypoxia, followed by 60 minutes of oxygenation. Vessels were treated with or without the selective SK activator NS309 for 5 minutes before and during CP hypoxia. RESULTS DM and/or CP-H/R significantly inhibited the total SK currents of MHECs and HCAECs and significantly diminished the mouse coronary relaxation response to NS309. Administration of NS309 immediately before and during CP hypoxia significantly improved the recovery of coronary endothelial function, as demonstrated by increased relaxation responses to adenosine 5'-diphosphate and substance P compared with those seen in controls (P < .05). This protective effect was more pronounced in vessels from ND mice and patients compared with DM mice and patients (P < .05). Cell surface membrane SK3 expression was significantly reduced after hypoxia, whereas cytosolic SK3 expression was greater than that of the sham control group (P < .05). CONCLUSIONS Application of NS309 immediately before and during CP hypoxia protects mouse and human coronary microvasculature against CP-H/R injury, but this effect is diminished in the diabetic coronary microvasculature. SK inhibition/inactivation and/or internalization/redistribution may contribute to CP-H/R-induced coronary endothelial and vascular relaxation dysfunction.
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Affiliation(s)
- Zhiqi Zhang
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Guangbin Shi
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Yuhong Liu
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Hang Xing
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Anatoli Y Kabakov
- Cardiovascular Research Center, Rhode Island Hospital, Providence, RI
| | - Amy S Zhao
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Vahid Agbortoko
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Justin Kim
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Arun K Singh
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Gideon Koren
- Cardiovascular Research Center, Rhode Island Hospital, Providence, RI
| | | | - Frank W Sellke
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI
| | - Jun Feng
- Division of Cardiothoracic Surgery, Rhode Island Hospital, Providence, RI.
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Sun WT, Hou HT, Chen HX, Xue HM, Wang J, He GW, Yang Q. Calcium-activated potassium channel family in coronary artery bypass grafts. J Thorac Cardiovasc Surg 2019; 161:e399-e409. [PMID: 31928817 DOI: 10.1016/j.jtcvs.2019.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 11/06/2019] [Accepted: 11/08/2019] [Indexed: 01/18/2023]
Abstract
OBJECTIVES We examined the expression, distribution, and contribution to vasodilatation of the calcium-activated potassium (KCa) channel family in the commonly used coronary artery bypass graft internal thoracic artery (ITA) and saphenous vein (SV) to understand the role of large conductance KCa (BKCa), intermediate-conductance KCa (IKCa), and small-conductance KCa (SKCa) channel subtypes in graft dilating properties determined by endothelium-smooth muscle interaction that is essential to the postoperative performance of the graft. METHODS Real-time polymerase chain reaction and western blot were employed to detect the messenger RNA and protein level of KCa channel subtypes. Distribution of KCa channel subtypes was examined by immunohistochemistry. KCa subtype-mediated vasorelaxation was studied using wire myography. RESULTS Both ITA and SV express all KCa channel subtypes with each subtype distributed in both endothelium and smooth muscle. ITA and SV do not differ in the overall expression level of each KCa channel subtype, corresponding to comparable relaxant responses to respective subtype activators. In ITA, BKCa is more abundantly expressed in smooth muscle than in endothelium, whereas SKCa exhibits more abundance in the endothelium. In comparison, SV shows even distribution of KCa channel subtypes in the 2 layers. The BKCa subtype in the KCa family plays a significant role in vasodilatation of ITA, whereas its contribution in SV is quite limited. CONCLUSIONS KCa family is abundantly expressed in ITA and SV. There are differences between these 2 grafts in the abundance of KCa channel subtypes in the endothelium and the smooth muscle. The significance of the BKCa subtype in vasodilatation of ITA may suggest the potential of development of BKCa modulators for the prevention and treatment of ITA spasm during/after coronary artery bypass graft surgery.
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Affiliation(s)
- Wen-Tao Sun
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Hai-Tao Hou
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Huan-Xin Chen
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Hong-Mei Xue
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Jun Wang
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
| | - Guo-Wei He
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China; School of Pharmacy, Wannan Medical College, Wuhu, Anhui, China; Department of Surgery, Oregon Health and Science University, Portland, Ore
| | - Qin Yang
- Center for Basic Medical Research & Department of Cardiovascular Surgery, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China.
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Huang J, Zhang H, Tan X, Hu M, Shen B. Exercise restores impaired endothelium-derived hyperpolarizing factor-mediated vasodilation in aged rat aortic arteries via the TRPV4-K Ca2.3 signaling complex. Clin Interv Aging 2019; 14:1579-1587. [PMID: 31564840 PMCID: PMC6731547 DOI: 10.2147/cia.s220283] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 08/25/2019] [Indexed: 12/28/2022] Open
Abstract
Background Aging leads to structural and functional changes in the vasculature characterized by arterial endothelial dysfunction and stiffening of large elastic arteries and is a predominant risk factor for cardiovascular disease, the leading cause of morbidity and mortality in modern societies. Although exercise reduces the risk of many age-related diseases, including cardiovascular disease, the mechanisms underlying the beneficial effects of exercise on age-related endothelial function fully elucidated. Purpose The present study explored the effects of exercise on the impaired endothelium-derived hyperpolarizing factor (EDHF)–mediated vasodilation in aged arteries and on the involvement of the transient receptor potential vanilloid 4 (TRPV4) channel and the small-conductance calcium-activated potassium (KCa2.3) channel signaling in this process. Methods Male Sprague-Dawley rats aged 19–21 months were randomly assigned to a sedentary group or to an exercise group. Two-month-old rats were used as young controls. Results We found that TRPV4 and KCa2.3 isolated from primary cultured rat aortic endothelial cells pulled each other down in co-immunoprecipitation assays, indicating that the two channels could physically interact. Using ex vivo functional arterial tension assays, we found that EDHF-mediated relaxation induced by acetylcholine or by the TRPV4 activator GSK1016790A was markedly decreased in aged rats compared with that in young rats and was significantly inhibited by TRPV4 or KCa2.3 blockers in both young and aged rats. However, exercise restored both the age-related and the TRPV4-mediated and KCa2.3-mediated EDHF responses. Conclusion These results suggest an important role for the TRPV4-KCa2.3 signaling undergirding the beneficial effect of exercise to ameliorate age-related arterial dysfunction.
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Affiliation(s)
- Junhao Huang
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Department of Sports and Health, Guangzhou Sport University, Guangzhou, Guangdong, People's Republic of China
| | - Hai Zhang
- Department of Physical Education, Guangdong University of Petrochemical Technology, Maoming, Guangdong, People's Republic of China
| | - Xianming Tan
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Department of Sports and Health, Guangzhou Sport University, Guangzhou, Guangdong, People's Republic of China
| | - Min Hu
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Department of Sports and Health, Guangzhou Sport University, Guangzhou, Guangdong, People's Republic of China
| | - Bing Shen
- Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui, People's Republic of China
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Selakovic V, Arsenijevic L, Jovanovic M, Sivcev S, Jovanovic N, Leontijevic M, Stojanovic M, Radenkovic M, Andjus P, Radenovic L. Functional and pharmacological analysis of agmatine administration in different cerebral ischemia animal models. Brain Res Bull 2019; 146:201-212. [PMID: 30641119 DOI: 10.1016/j.brainresbull.2019.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 12/18/2018] [Accepted: 01/03/2019] [Indexed: 11/17/2022]
Abstract
Agmatine (AgM, 100 mg/kg i.p.) effect was tested in parallel at two animal models of cerebral ischemia - rat MCAO model (60'/24 h, 60'/48 h, 90'/24 h, 90'/48 h) and gerbil global ischemia (10') model, administrated 5 min after reperfusion. Aim was to evaluate AgM effect on functional outcome 24 and 48 h after MCAO on neurological and sensor-motor function, and coordination in rats. AgM administration significantly reduced infarct volume, improved neurological score and improved post-ischemic oxidative status. Results of behavioral tests (cylinder test, beam walking test, and adhesive removal test) have shown very effective functional recovery after AgM administration. Efficiency of AgM administration in gerbils was observed in forebrain cortex, striatum, hippocampus, and cerebellum at the level of each examined oxidative stress parameter (nitric oxide level, superoxide production, superoxide dismutase activity, and index of lipid peroxidation) measured in four different time points starting at 3 h up to 48 h after reperfusion. The highest levels were obtained 6 h after the insult. The most sensitive oxidative stress parameter to AgM was nitric oxide. Additionally, we performed pharmacological analysis of AgM on rat isolated common carotid arteries. The findings imply that mixed population of potassium channels located on the smooth muscle cells was involved in common carotid artery response to AgM, with predominance of inward rectifying K+ channels. In our comparative experimental approach, judged by behavioral, biochemical, as well as pharmacological data, the AgM administration showed an effective reduction of ischemic neurological damage and oxidative stress, hence indicating a direction towards improving post-stroke recovery.
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Affiliation(s)
- V Selakovic
- Institute of Medical Research, Medical Faculty Military Medical Academy, University of Defense, Serbia
| | | | - M Jovanovic
- Faculty of Biology, University of Belgrade, Serbia
| | - S Sivcev
- Faculty of Biology, University of Belgrade, Serbia
| | - N Jovanovic
- Faculty of Biology, University of Belgrade, Serbia
| | | | - M Stojanovic
- Department of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, Serbia
| | - M Radenkovic
- Department of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, Serbia
| | - P Andjus
- Faculty of Biology, University of Belgrade, Serbia
| | - L Radenovic
- Faculty of Biology, University of Belgrade, Serbia.
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Total Flavone of Rhododendron Improves Cerebral Ischemia Injury by Activating Vascular TRPV4 to Induce Endothelium-Derived Hyperpolarizing Factor-Mediated Responses. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 2018:8919867. [PMID: 30405745 PMCID: PMC6201489 DOI: 10.1155/2018/8919867] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 09/07/2018] [Accepted: 09/19/2018] [Indexed: 01/14/2023]
Abstract
Background Total flavonoids of Rhododendron (TFR) is extracted from Rhododendron, a herbal medicine widely used in China. The main components are flavone compounds such as warfarin, rutin, quercetin, and hyperoside. We investigated the role of TRPV4 channel in the TFR induced endothelium-dependent hyperpolarizing factor- (EDHF-) mediated responses against ischemia/reperfusion injury (IR) in cerebral IR (CIR) rats. Methods The morphological changes of cerebral cortex, the relaxation of cerebral basal artery (CBA), and cell membrane potential recording were studied in CIR rats. The outward potassium current in smooth muscle cell was recorded by whole-cell patch clamp recording. The protein expression of TRPV4, SKca, and IKca was determined. Confocal laser was used to measure the Ca2+ fluorescence intensity. Results After treatment with TFR, the number of pyramidal cells in brain tissue increased and the number of empty or lightly stained cells decreased and these effects were eliminated by using HC-067047, Apamin, or TRAM-34. TFR induced and EDHF-mediated dilatation and hyperpolarization in CBA were also attenuated by using these inhibitors. The increased outward current density elicited by TFR in acutely isolated CBA smooth muscle cells was abolished by using TRAM-34 and Apamin. TFR upregulated the protein expression of TRPV4, SKca, and IKca that was also eliminated by these inhibitors. Laser scanning showed that the increased mean fluorescence intensity of Ca2+ by CIR was decreased by using TFR and that this effect was again eliminated by the above inhibitors. Conclusions We conclude that in the CBA of the CIR rats the protective effect of TFR on ischemic cerebrovascular injury may be related to the activation of the TRPV4 in both endothelium and smooth muscle by increasing its expression and activity. The activation of TRPV4 channel in the endothelium may be linked to the opening of endothelial IKca/SKca channels that induces EDHF-mediated relaxation and hyperpolarization in the smooth muscle cell. In addition, the activation of TRPV4 in the smooth muscle cell in CBA may be linked with the activation of BKCa channel through a TRPV4-dependent pathway, reduce Ca2+ concentration in the cell, and relaxes the vessel. These findings may form a new therapeutic target for protection of ischemic brain injury and facilitate the use of Chinese medicine in brain protection.
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16
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Microvascular dysfunction in patients with diabetes after cardioplegic arrest and cardiopulmonary bypass. Curr Opin Cardiol 2018; 31:618-624. [PMID: 27652811 DOI: 10.1097/hco.0000000000000340] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
PURPOSE OF REVIEW The purpose of the current review is to describe the changes of microvascular function in patients with diabetes after cardioplegic arrest and cardiopulmonary bypass (CPB) and cardiac surgery. RECENT FINDINGS Cardiac surgery, especially that involving cardioplegia and CPB, is associated with significant changes in vascular reactivity of coronary/peripheral microcirculation, vascular permeability, gene/protein expression, and programmed cell death, as well as with increased morbidity and mortality after surgical procedures. In particular, these changes are more profound in patients with poorly controlled diabetes. SUMMARY Because alterations in vasomotor regulation are critical aspects of mortality and morbidity of cardioplegia/CPB, a better understanding of diabetic regulation of microvascular function may lead to improved postoperative outcomes of patients with diabetes after cardioplegia/CPB and cardiac surgery.
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Ye L, Xu M, Hu M, Zhang H, Tan X, Li Q, Shen B, Huang J. TRPV4 is involved in irisin-induced endothelium-dependent vasodilation. Biochem Biophys Res Commun 2017; 495:41-45. [PMID: 29097199 DOI: 10.1016/j.bbrc.2017.10.160] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 10/29/2017] [Indexed: 02/07/2023]
Abstract
Irisin, an exercise-induced myokine, induces conversion of white into brown adipocytes, promoting mitochondrial biogenesis and energy expenditure. Irisin has a vascular protective effect on endothelial function in animals, including humans. Defects in irisin signaling pathways result in endothelial dysfunction in obesity and diabetes. However, the mechanisms underlying the effects of irisin on endothelial function have not been elucidated. Transient receptor potential vanilloid subtype 4 (TRPV4) channels are one of the most important Ca2+-permeable cation channels in vascular endothelial cells. In this study, we hypothesized that irisin may induce endothelium-dependent vasodilation by activating Ca2+ influx into endothelial cells via TRPV4 channels. In primary cultured rat mesenteric artery endothelial cells, irisin caused an increase in [Ca2+]i due to extracellular Ca2+ influx rather than release from Ca2+ stores. Moreover, irisin-induced increases in [Ca2+]i were completely abolished by a TRPV4 inhibitor. In addition, irisin induced endothelium-dependent vasodilation of rat mesenteric arteries. However, irisin had no effect on endothelium-independent vasodilation. Furthermore, irisin-induced vasodilation was fully abolished in the presence of a TRPV4 inhibitor, indicating the involvement of TRPV4 channels in endothelium-dependent vasodilation. This study provides the first evidence that irisin-induced endothelium-dependent vasodilation is related to the stimulation of extracellular Ca2+ influx via TRPV4 channels in rat mesenteric arteries.
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Affiliation(s)
- Li Ye
- School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui 230032, China
| | - Mengnan Xu
- School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui 230032, China
| | - Min Hu
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Guangzhou Sport University, Guangzhou, Guangdong, China
| | - Hai Zhang
- Department of Physical Education, Guangdong University of Petrochemical Technology, Maoming, Guangdong, China
| | - Xianming Tan
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Guangzhou Sport University, Guangzhou, Guangdong, China
| | - Qing Li
- Central Laboratory of Medical Research Center, Anhui Provincial Hospital, Hefei, Anhui 230001, China
| | - Bing Shen
- School of Basic Medical Sciences, Anhui Medical University, Hefei, Anhui 230032, China.
| | - Junhao Huang
- Guangdong Provincial Key Laboratory of Sports and Health Promotion, Scientific Research Center, Guangzhou Sport University, Guangzhou, Guangdong, China.
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Mak SK, Yu CM, Sun WT, He GW, Liu XC, Yang Q. Tetramethylpyrazine suppresses angiotensin II-induced soluble epoxide hydrolase expression in coronary endothelium via anti-ER stress mechanism. Toxicol Appl Pharmacol 2017; 336:84-93. [PMID: 29066182 DOI: 10.1016/j.taap.2017.10.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 09/15/2017] [Accepted: 10/18/2017] [Indexed: 12/25/2022]
Abstract
Activation of soluble epoxide hydrolase (sEH) is associated with endothelial dysfunction in hypertension, though the underlying mechanisms are inadequately understood and the role of endoplasmic reticulum (ER) stress is yet to be studied in detail. Tetramethylpyrazine (TMP), a major bioactive ingredient of Chinese herb Chuanxiong, is well-known for its cardiovascular benefits. Nevertheless, whether TMP may protect vascular endothelium from ER stress and whether regulation of sEH is involved remain unknown. This study aimed at investigating the role of ER stress in angiotensin-II (Ang-II)-induced sEH dysregulation and elucidating the significance of ER stress regulation in the vasoprotective effect of TMP. Porcine primary coronary artery endothelial cells (PCECs) were used for western blot, ELISA, and reverse-transcription PCR analysis. Porcine coronary arteries were assessed in a myograph for endothelial dilator function. Ang-II induced expression of ER stress molecules in PCECs meanwhile enhanced sEH expression and decreased 11,12-EET. Exposure of PCECs to the chemical ER stress inducer tunicamycin also increased sEH expression. Inhibition of ER stress suppressed sEH upregulation, resulting in an increase of 11,12-EET. The impairment of endothelium-dependent vasorelaxation induced by Ang-II or tunicamycin was ameliorated by inhibitors of ER stress or sEH. TMP showed comparable inhibitory effect to ER stress inhibitors on the expression of ER stress molecules, the dysregulation of sEH/EET, and the impairment of endothelial dilator function. We demonstrated that ER stress mediates Ang-II-induced sEH upregulation in coronary endothelium. TMP has potent anti-ER stress capacity through which TMP normalizes sEH expression and confers protective effect against Ang-II on endothelial function of coronary arteries.
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Affiliation(s)
- Shiu-Kwong Mak
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong
| | - Cheuk-Man Yu
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong
| | - Wen-Tao Sun
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong
| | - Guo-Wei He
- TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Xiao-Cheng Liu
- TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Qin Yang
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong; TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China.
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19
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Li FF, He MZ, Xie Y, Wu YY, Yang MT, Fan Y, Qiao FY, Deng DR. Involvement of dysregulated IK Ca and SK Ca channels in preeclampsia. Placenta 2017; 58:9-16. [PMID: 28962702 DOI: 10.1016/j.placenta.2017.07.361] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 07/25/2017] [Accepted: 07/31/2017] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Excessive constriction of placental chorionic plate arteries (CPAs) may be associated with preeclampsia (PE). Nitric oxide (NO) as well as intermediate and small Ca2+-activated K+ channels (IKCa and SKCa) plays vital roles in vasodilation of CPAs. We hypothesized that dysregulated IKCa and SKCa channels may be involved in the pathogenesis of PE mediated by the impaired NO system on CPAs. METHODS The location of IKCa and SKCa channels, activities of NO synthases (NOS), and expression levels of these molecules were studied on CPAs from 30 normal pregnancies and 30 PE. The vasodilating function of CPAs was measured under openers or blockers of IKCa/SKCa channels in the presence or absence of NO donor or inhibitor. RESULTS IKCa and SKCa channels were located both on endothelium and on smooth muscles of CPAs and the expressions of them were downregulated in PE women comparing to those in normal pregnant women. The protein expressions of endothelial NOS (eNOS) and inducible NOS (iNOS) were downregulated on CPAs in PE accompanied by decreased activity of eNOS. Notably, the vasodilatory functions mediated by IKCa/SKCa channels and by NO were aberrant on preeclamptic CPAs. In addition, IKCa and SKCa channels were responsible for nitric oxide (NO)-attributable vasorelaxation and activity modulation of NO synthases. CONCLUSIONS This study provides evidence that dysregulated IKCa and SKCa channels might contribute to fetal pathogenesis of PE through direct promotion of vascular constriction of CPAs and through affecting functions of NO and activities of NOS.
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Affiliation(s)
- Fan-Fan Li
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Meng-Zhou He
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yin Xie
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yuan-Yuan Wu
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Mei-Tao Yang
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yao Fan
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Fu-Yuan Qiao
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Dong-Rui Deng
- Department of Gynecology and Obstetrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
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Impairment of Coronary Endothelial Function by Hypoxia-Reoxygenation Involves TRPC3 Inhibition-mediated K Ca Channel Dysfunction: Implication in Ischemia-Reperfusion Injury. Sci Rep 2017; 7:5895. [PMID: 28724979 PMCID: PMC5517640 DOI: 10.1038/s41598-017-06247-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 06/05/2017] [Indexed: 01/18/2023] Open
Abstract
Despite increasing knowledge of the significance of calcium-activated potassium (KCa) and canonical transient receptor potential (TRPC) channels in endothelial physiology, no studies so far have investigated the link between these two distinct types of channels in the control of vascular tone in pathological conditions. We previously demonstrated that hypoxia-reoxygenation (H-R) inhibits endothelial KCa and TRPC3 channels in porcine coronary arteries (PCAs). The present study further investigated whether modulation of TRPC3 is involved in H-R-induced KCa channel inhibition and associated vasodilatory dysfunction using approaches of wire myography, whole-cell voltage-clamp, and coimmunoprecipitation. Pharmacological inhibition or siRNA silencing of TRPC3 significantly suppressed bradykinin-induced intermediate- and small-conductance KCa (IKCa and SKCa) currents in endothelial cells of PCAs (PCAECs). TRPC3 protein exists in physical association with neither IKCa nor SKCa. In H-R-exposed PCAECs, the response of IKCa and SKCa to bradykinin-stimulation and to TRPC3-inhibition was markedly weakened. Activation of TRPC3 channels restored H-R-suppressed KCa currents in association with an improved endothelium-derived hyperpolarizing factor (EDHF)-type vasorelaxation. We conclude that inhibition of TRPC3 channels contributes to H-R-induced suppression of KCa channel activity, which serves as a mechanism underlying coronary endothelial dysfunction in ischemia-reperfusion (I-R) injury and renders TRPC3 a potential target for endothelial protection in I-R conditions.
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Yang M, Camara AKS, Aldakkak M, Kwok WM, Stowe DF. Identity and function of a cardiac mitochondrial small conductance Ca 2+-activated K + channel splice variant. BIOCHIMICA ET BIOPHYSICA ACTA. BIOENERGETICS 2017; 1858:442-458. [PMID: 28342809 PMCID: PMC5749404 DOI: 10.1016/j.bbabio.2017.03.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/28/2017] [Accepted: 03/21/2017] [Indexed: 01/07/2023]
Abstract
We provide evidence for location and function of a small conductance, Ca2+-activated K+ (SKCa) channel isoform 3 (SK3) in mitochondria (m) of guinea pig, rat and human ventricular myocytes. SKCa agonists protected isolated hearts and mitochondria against ischemia/reperfusion (IR) injury; SKCa antagonists worsened IR injury. Intravenous infusion of a SKCa channel agonist/antagonist, respectively, in intact rats was effective in reducing/enhancing regional infarct size induced by coronary artery occlusion. Localization of SK3 in mitochondria was evidenced by Western blot of inner mitochondrial membrane, immunocytochemical staining of cardiomyocytes, and immunogold labeling of isolated mitochondria. We identified a SK3 splice variant in guinea pig (SK3.1, aka SK3a) and human ventricular cells (SK3.2) by amplifying mRNA, and show mitochondrial expression in mouse atrial tumor cells (HL-1) by transfection with full length and truncated SK3.1 protein. We found that the N-terminus is not required for mitochondrial trafficking but the C-terminus beyond the Ca2+ calmodulin binding domain is required for Ca2+ sensing to induce mK+ influx and/or promote mitochondrial localization. In isolated guinea pig mitochondria and in SK3 overexpressed HL-1 cells, mK+ influx was driven by adding CaCl2. Moreover, there was a greater fall in membrane potential (ΔΨm), and enhanced cell death with simulated cell injury after silencing SK3.1 with siRNA. Although SKCa channel opening protects the heart and mitochondria against IR injury, the mechanism for favorable bioenergetics effects resulting from SKCa channel opening remains unclear. SKCa channels could play an essential role in restraining cardiac mitochondria from inducing oxidative stress-induced injury resulting from mCa2+ overload.
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Affiliation(s)
- MeiYing Yang
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Amadou K S Camara
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA; Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Mohammed Aldakkak
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Wai-Meng Kwok
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA; Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI, USA; Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA
| | - David F Stowe
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, WI, USA; Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, USA; Department of Biomedical Engineering, Medical College of Wisconsin and Marquette University, Milwaukee, WI, USA; Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI, USA; Research Service, Zablocki VA Medical Center, Milwaukee, WI, USA.
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22
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Honrath B, Krabbendam IE, Culmsee C, Dolga AM. Small conductance Ca 2+-activated K + channels in the plasma membrane, mitochondria and the ER: Pharmacology and implications in neuronal diseases. Neurochem Int 2017; 109:13-23. [PMID: 28511953 DOI: 10.1016/j.neuint.2017.05.005] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/24/2017] [Accepted: 05/08/2017] [Indexed: 12/14/2022]
Abstract
Ca2+-activated K+ (KCa) channels regulate after-hyperpolarization in many types of neurons in the central and peripheral nervous system. Small conductance Ca2+-activated K+ (KCa2/SK) channels, a subfamily of KCa channels, are widely expressed in the nervous system, and in the cardiovascular system. Voltage-independent SK channels are activated by alterations in intracellular Ca2+ ([Ca2+]i) which facilitates the opening of these channels through binding of Ca2+ to calmodulin that is constitutively bound to the SK2 C-terminus. In neurons, SK channels regulate synaptic plasticity and [Ca2+]i homeostasis, and a number of recent studies elaborated on the emerging neuroprotective potential of SK channel activation in conditions of excitotoxicity and cerebral ischemia, as well as endoplasmic reticulum (ER) stress and oxidative cell death. Recently, SK channels were discovered in the inner mitochondrial membrane and in the membrane of the endoplasmic reticulum which sheds new light on the underlying molecular mechanisms and pathways involved in SK channel-mediated protective effects. In this review, we will discuss the protective properties of pharmacological SK channel modulation with particular emphasis on intracellularly located SK channels as potential therapeutic targets in paradigms of neuronal dysfunction.
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Affiliation(s)
- Birgit Honrath
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, 35043 Marburg, Germany; Faculty of Science and Engineering, Groningen Research Institute of Pharmacy, Department of Molecular Pharmacology, University of Groningen, 9713 AV Groningen, The Netherlands
| | - Inge E Krabbendam
- Faculty of Science and Engineering, Groningen Research Institute of Pharmacy, Department of Molecular Pharmacology, University of Groningen, 9713 AV Groningen, The Netherlands
| | - Carsten Culmsee
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, 35043 Marburg, Germany
| | - Amalia M Dolga
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, 35043 Marburg, Germany; Faculty of Science and Engineering, Groningen Research Institute of Pharmacy, Department of Molecular Pharmacology, University of Groningen, 9713 AV Groningen, The Netherlands.
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Sun WT, Wang XC, Mak SK, He GW, Liu XC, Underwood MJ, Yang Q. Activation of PERK branch of ER stress mediates homocysteine-induced BK Ca channel dysfunction in coronary artery via FoxO3a-dependent regulation of atrogin-1. Oncotarget 2017; 8:51462-51477. [PMID: 28881660 PMCID: PMC5584261 DOI: 10.18632/oncotarget.17721] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 04/07/2017] [Indexed: 11/25/2022] Open
Abstract
The molecular mechanism of endoplasmic reticulum (ER) stress in vascular pathophysiology remains inadequately understood. We studied the role of ER stress in homocysteine-induced impairment of coronary dilator function, with uncovering the molecular basis of the effect of ER stress on smooth muscle large-conductance Ca2+-activated K+ (BKCa) channels. The vasodilatory function of BKCa channels was studied in a myograph using endothelium-denuded porcine small coronary arteries. Primary cultured porcine coronary artery smooth muscle cells were used for mRNA and protein measurements and current recording of BKCa channels. Homocysteine inhibited vasorelaxant response to the BKCachannel opener NS1619, lowered BKCa β1 subunit protein level and suppressed BKCa current. Inhibition of ER stress restored BKCa β1 protein level and NS1619-evoked vasorelaxation. Selective blockade of the PKR-like ER kinase (PERK) yielded similarly efficient restoration of BKCa β1, preserving BKCa current and BKCa-mediated vasorelaxation. The restoration of BKCa β1 by PERK inhibition was associated with reduced atrogin-1 expression and decreased nuclear localization of forkhead box O transcription factor 3a (FoxO3a). Silencing of atrogin-1 prevented homocysteine-induced BKCa β1 loss and silencing of FoxO3a prevented atrogin-1 upregulation induced by homocysteine, accompanied by preservation of BKCa β1 protein level and BKCa current. ER stress mediates homocysteine-induced BKCa channel inhibition in coronary arteries. Activation of FoxO3a by PERK branch underlies the ER stress-mediated BKCa inhibition through a mechanism involving ubiquitin ligase-enhanced degradation of the channel β1 subunit.
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Affiliation(s)
- Wen-Tao Sun
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Xiang-Chong Wang
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Shiu-Kwong Mak
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Guo-Wei He
- TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Xiao-Cheng Liu
- TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Malcolm John Underwood
- Division of Cardiothoracic Surgery, Department of Surgery, The Chinese University of Hong Kong, Hong Kong, China
| | - Qin Yang
- Division of Cardiology, Department of Medicine and Therapeutics, Institute of Vascular Medicine, Li Ka Shing Institute of Health Sciences, Institute of Innovative Medicine, The Chinese University of Hong Kong, Hong Kong, China.,TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
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Cheng XQ, Zhang JY, Gao SS, Wu H, Zuo YM, Gu EW, Chen ZW. Sufentanil attenuates impairment of the endothelium-dependent vasodilation induced by hypoxia-reoxygenation in the rat coronary artery. Can J Physiol Pharmacol 2016; 94:1309-1314. [PMID: 27533316 DOI: 10.1139/cjpp-2016-0037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sufentanil has been used broadly in cardiac surgery, but the mechanisms by which it modulates coronary vascular tone after ischemia-reperfusion injury are largely unknown. Effects of sufentanil on coronary tone and on the relaxation of rat coronary arteries (CAs) in response to endothelium-dependent (acetylcholine) and endothelium-independent (sodium nitroprusside) relaxing agents in the presence of hypoxia-reoxygenation (H/R) was studied in an in vitro organ chamber setup. Sufentanil (10-7-10-4 mol/L) relaxed rat CA rings in endothelium-dependent and endothelium-independent manners. In endothelium-intact rings, preincubation of H/R-treated CAs with sufentanil (10-5 mol/L) significantly increased the acetylcholine response, but did not augment sodium nitroprusside-induced relaxation. Sufentanil-mediated potentiation of acetylcholine-induced relaxation was not affected by a nitric oxide synthase inhibitor or by intermediate- or small-conductance Ca2+-activated K+ channel blockers. However, potentiation was abolished by iberiotoxin (100 nmol/L), a selective inhibitor of large-conductance Ca2+-activated K+ channels, as well as Rp-cAMPS (30 μmol/L), a cyclic AMP-dependent protein kinase (PKA) inhibitor. Sufentanil induced endothelium-dependent and endothelium-independent relaxation and attenuated H/R-induced impairment of endothelium-dependent vasodilation in the rat CAs. The potentiating effect of sufentanil may involve activation of large-conductance Ca2+-activated K+ channels via cAMP-dependent mechanisms.
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Affiliation(s)
- Xin-Qi Cheng
- a Department of Pharmacology, Basic Medical College, Anhui Medical University, Hefei 230032, Anhui, China.,b Department of Anaesthesiology, First Affiliated Hospital of Anhui Medical University, Hefei, 230022, Anhui, China
| | - Jun-Yan Zhang
- a Department of Pharmacology, Basic Medical College, Anhui Medical University, Hefei 230032, Anhui, China
| | - Shan-Shan Gao
- a Department of Pharmacology, Basic Medical College, Anhui Medical University, Hefei 230032, Anhui, China
| | - Hao Wu
- b Department of Anaesthesiology, First Affiliated Hospital of Anhui Medical University, Hefei, 230022, Anhui, China
| | - You-Mei Zuo
- b Department of Anaesthesiology, First Affiliated Hospital of Anhui Medical University, Hefei, 230022, Anhui, China
| | - Er-Wei Gu
- b Department of Anaesthesiology, First Affiliated Hospital of Anhui Medical University, Hefei, 230022, Anhui, China
| | - Zhi-Wu Chen
- a Department of Pharmacology, Basic Medical College, Anhui Medical University, Hefei 230032, Anhui, China
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25
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Oliván-Viguera A, Valero MS, Pinilla E, Amor S, García-Villalón ÁL, Coleman N, Laría C, Calvín-Tienza V, García-Otín ÁL, Fernández-Fernández JM, Murillo MD, Gálvez JA, Díaz-de-Villegas MD, Badorrey R, Simonsen U, Rivera L, Wulff H, Köhler R. Vascular Reactivity Profile of Novel KCa 3.1-Selective Positive-Gating Modulators in the Coronary Vascular Bed. Basic Clin Pharmacol Toxicol 2016; 119:184-92. [PMID: 26821335 DOI: 10.1111/bcpt.12560] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 01/17/2016] [Indexed: 12/12/2022]
Abstract
Opening of intermediate-conductance calcium-activated potassium channels (KC a 3.1) produces membrane hyperpolarization in the vascular endothelium. Here, we studied the ability of two new KC a 3.1-selective positive-gating modulators, SKA-111 and SKA-121, to (1) evoke porcine endothelial cell KC a 3.1 membrane hyperpolarization, (2) induce endothelium-dependent and, particularly, endothelium-derived hyperpolarization (EDH)-type relaxation in porcine coronary arteries (PCA) and (3) influence coronary artery tone in isolated rat hearts. In whole-cell patch-clamp experiments on endothelial cells of PCA (PCAEC), KC a currents evoked by bradykinin (BK) were potentiated ≈7-fold by either SKA-111 or SKA-121 (both at 1 μM) and were blocked by a KC a 3.1 blocker, TRAM-34. In membrane potential measurements, SKA-111 and SKA-121 augmented bradykinin-induced hyperpolarization. Isometric tension measurements in large- and small-calibre PCA showed that SKA-111 and SKA-121 potentiated endothelium-dependent relaxation with intact NO synthesis and EDH-type relaxation to BK by ≈2-fold. Potentiation of the BK response was prevented by KC a 3.1 inhibition. In Langendorff-perfused rat hearts, SKA-111 potentiated coronary vasodilation elicited by BK. In conclusion, our data show that positive-gating modulation of KC a 3.1 channels improves BK-induced membrane hyperpolarization and endothelium-dependent relaxation in small and large PCA as well as in the coronary circulation of rats. Positive-gating modulators of KC a 3.1 could be therapeutically useful to improve coronary blood flow and counteract impaired coronary endothelial dysfunction in cardiovascular disease.
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Affiliation(s)
| | - Marta Sofía Valero
- Department of Pharmacy, Faculty of Health Sciences, Universidad San Jorge, Villanueva de Gállego, Spain
| | - Estéfano Pinilla
- Department of Biomedicine, Pulmonary and Cardiovascular Pharmacology, Aarhus University, Aarhus, Denmark
| | - Sara Amor
- Department of Physiology, Faculty of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | | | - Nichole Coleman
- Department of Pharmacology, University of California, Davis, CA, USA
| | - Celia Laría
- Department of Pharmacy, Faculty of Health Sciences, Universidad San Jorge, Villanueva de Gállego, Spain
| | - Víctor Calvín-Tienza
- Department of Pharmacy, Faculty of Health Sciences, Universidad San Jorge, Villanueva de Gállego, Spain
| | - Ángel-Luis García-Otín
- Department of Pharmacy, Faculty of Health Sciences, Universidad San Jorge, Villanueva de Gállego, Spain
| | - José M Fernández-Fernández
- Laboratori de Fisiologia Molecular i Canalopaties, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
| | - M Divina Murillo
- Department of Pharmacology and Physiology, Veterinary Faculty, University of Zaragoza, Zaragoza, Spain
| | - José A Gálvez
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Zaragoza, Spain
| | - María D Díaz-de-Villegas
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Zaragoza, Spain
| | - Ramón Badorrey
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Zaragoza, Spain
| | - Ulf Simonsen
- Department of Biomedicine, Pulmonary and Cardiovascular Pharmacology, Aarhus University, Aarhus, Denmark
| | - Luis Rivera
- Department of Physiology, Faculty of Pharmacy, Universidad Complutense de Madrid, Madrid, Spain
| | - Heike Wulff
- Department of Pharmacology, University of California, Davis, CA, USA
| | - Ralf Köhler
- Aragon Institute of Health Sciences & IIS, Zaragoza, Spain.,Aragon Agency for Research and Development (ARAID), Zaragoza, Spain
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Liu Y, Xie A, Singh AK, Ehsan A, Choudhary G, Dudley S, Sellke FW, Feng J. Inactivation of Endothelial Small/Intermediate Conductance of Calcium-Activated Potassium Channels Contributes to Coronary Arteriolar Dysfunction in Diabetic Patients. J Am Heart Assoc 2015; 4:e002062. [PMID: 26304940 PMCID: PMC4599465 DOI: 10.1161/jaha.115.002062] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Background Diabetes is associated with coronary arteriolar endothelial dysfunction. We investigated the role of the small/intermediate (SKCa/IKCa) conductance of calcium-activated potassium channels in diabetes-related endothelial dysfunction. Methods and Results Coronary arterioles (80 to 150 μm in diameter) were dissected from discarded right atrial tissues of diabetic (glycosylated hemoglobin = 9.6±0.25) and nondiabetic patients (glycosylated hemoglobin 5.4±0.12) during coronary artery bypass graft surgery (n=8/group). In-vitro relaxation response of precontracted arterioles was examined in the presence of the selective SKCa/IKCa activator NS309 and other vasodilatory agents. The channel density and membrane potential of diabetic and nondiabetic endothelial cells was measured by using the whole cell patch-clamp technique. The protein expression and distribution of the SKCa/IKCa in the human myocardium and coronary arterioles was examined by Western blotting and immunohistochemistry. Our results indicate that diabetes significantly reduced the coronary arteriolar response to the SKCa/IKCa activator NS309 compared to the respective responses of nondiabetic vessels (P<0.05 versus nondiabetes). The relaxation response of diabetic arterioles to NS309 was prevented by denudation of endothelium (P=0.001 versus endothelium-intact). Diabetes significantly decreased endothelial SKCa/IKCa currents and hyperpolarization induced by the SKCa/IKCa activator NS309 as compared with that of nondiabetics. There were no significant differences in the expression and distribution of SKCa/IKCa proteins in the coronary microvessels. Conclusions Diabetes is associated with inactivation of endothelial SKCa/IKCa channels, which may contribute to endothelial dysfunction in diabetic patients.
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Affiliation(s)
- Yuhong Liu
- Division of Cardiothoracic Surgery, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (Y.L., A.K.S., A.E., F.W.S., J.F.)
| | - An Xie
- Division of Cardiology, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (A.X., S.D.)
| | - Arun K Singh
- Division of Cardiothoracic Surgery, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (Y.L., A.K.S., A.E., F.W.S., J.F.)
| | - Afshin Ehsan
- Division of Cardiothoracic Surgery, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (Y.L., A.K.S., A.E., F.W.S., J.F.)
| | - Gaurav Choudhary
- Department of Medicine, Providence VA Medical Center, Alpert Medical School of Brown University, Providence, RI (G.C.)
| | - Samuel Dudley
- Division of Cardiology, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (A.X., S.D.)
| | - Frank W Sellke
- Division of Cardiothoracic Surgery, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (Y.L., A.K.S., A.E., F.W.S., J.F.)
| | - Jun Feng
- Division of Cardiothoracic Surgery, Cardiovascular Research Center, Rhode Island Hospital, Providence, RI (Y.L., A.K.S., A.E., F.W.S., J.F.)
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McAninch EA, Fonseca TL, Poggioli R, Panos AL, Salerno TA, Deng Y, Li Y, Bianco AC, Iacobellis G. Epicardial adipose tissue has a unique transcriptome modified in severe coronary artery disease. Obesity (Silver Spring) 2015; 23:1267-78. [PMID: 25959145 PMCID: PMC5003780 DOI: 10.1002/oby.21059] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 01/26/2015] [Indexed: 01/10/2023]
Abstract
OBJECTIVE To explore the transcriptome of epicardial adipose tissue (EAT) as compared to subcutaneous adipose tissue (SAT) and its modifications in a small number of patients with coronary artery disease (CAD) versus valvulopathy. METHODS SAT and EAT samples were obtained during elective cardiothoracic surgeries. The transcriptome of EAT was evaluated, as compared to SAT, using an unbiased, whole-genome approach in subjects with CAD (n = 6) and without CAD (n = 5), where the patients without CAD had cardiac valvulopathy. RESULTS Relative to SAT, EAT is a highly inflammatory tissue enriched with genes involved in endothelial function, coagulation, immune signaling, potassium transport, and apoptosis. EAT is lacking in expression of genes involved in protein metabolism, tranforming growth factor-beta (TGF-beta) signaling, and oxidative stress. Although underpowered, in subjects with severe CAD, there is an expression trend suggesting widespread downregulation of EAT encompassing a diverse group of gene sets related to intracellular trafficking, proliferation/transcription regulation, protein catabolism, innate immunity/lectin pathway, and ER stress. CONCLUSIONS The EAT transcriptome is unique when compared to SAT. In the setting of CAD versus valvulopathy, there is possible alteration of the EAT transcriptome with gene suppression. This pilot study explores the transcriptome of EAT in CAD and valvulopathy, providing new insight into its physiologic and pathophysiologic roles.
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Affiliation(s)
- Elizabeth A. McAninch
- Department of Medicine, Division of Endocrinology and Metabolism, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Tatiana L. Fonseca
- Department of Medicine, Division of Endocrinology and Metabolism, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Raffaella Poggioli
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Miami Miller School of Medicine, Miami, Florida, 33136, USA
| | - Anthony L. Panos
- Department of Surgery, Division of Thoracic and Cardiac Surgery, University of Miami Miller School of Medicine, Miami, Florida, 33136, USA
| | - Tomas A. Salerno
- Department of Surgery, Division of Thoracic and Cardiac Surgery, University of Miami Miller School of Medicine, Miami, Florida, 33136, USA
| | - Youping Deng
- Department of Medicine, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Yan Li
- Department of Medicine, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Antonio C. Bianco
- Department of Medicine, Division of Endocrinology and Metabolism, Rush University Medical Center, Chicago, IL, 60612, USA
| | - Gianluca Iacobellis
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Miami Miller School of Medicine, Miami, Florida, 33136, USA
- Corresponding author: Gianluca Iacobellis, MD, PhD, 1400 NW 10th Avenue, Suite 805A, Miami, Florida 33136, USA, Phone: 305.243.3636; Fax: 305.243.6575;
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Tano JY, Gollasch M. Calcium-activated potassium channels in ischemia reperfusion: a brief update. Front Physiol 2014; 5:381. [PMID: 25339909 PMCID: PMC4186282 DOI: 10.3389/fphys.2014.00381] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 09/13/2014] [Indexed: 12/24/2022] Open
Abstract
Ischemia and reperfusion (IR) injury constitutes one of the major causes of cardiovascular morbidity and mortality. The discovery of new therapies to block/mediate the effects of IR is therefore an important goal in the biomedical sciences. Dysfunction associated with IR involves modification of calcium-activated potassium channels (KCa) through different mechanisms, which are still under study. Respectively, the KCa family, major contributors to plasma membrane calcium influx in cells and essential players in the regulation of the vascular tone are interesting candidates. This family is divided into two groups including the large conductance (BKCa) and the small/intermediate conductance (SKCa/IKCa) K(+) channels. In the heart and brain, these channels have been described to offer protection against IR injury. BKCa and SKCa channels deserve special attention since new data demonstrate that these channels are also expressed in mitochondria. More studies are however needed to fully determine their potential use as therapeutic targets.
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Affiliation(s)
- Jean-Yves Tano
- Experimental and Clinical Research Center, Charité University Medicine - Max Delbrück Center (MDC) for Molecular Medicine Berlin, Germany ; Nephrology/Intensive Care Section, Charité University Medicine Berlin, Germany
| | - Maik Gollasch
- Experimental and Clinical Research Center, Charité University Medicine - Max Delbrück Center (MDC) for Molecular Medicine Berlin, Germany ; Nephrology/Intensive Care Section, Charité University Medicine Berlin, Germany
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Yang Q, Huang JH, Yao XQ, Underwood MJ, Yu CM. Activation of canonical transient receptor potential channels preserves Ca2+ entry and endothelium-derived hyperpolarizing factor–mediated function in vitro in porcine coronary endothelial cells and coronary arteries under conditions of hyperkalemia. J Thorac Cardiovasc Surg 2014; 148:1665-1673.e1. [DOI: 10.1016/j.jtcvs.2014.02.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2013] [Revised: 01/21/2014] [Accepted: 02/03/2014] [Indexed: 10/25/2022]
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Protection of coronary endothelial function during cardiac surgery: potential of targeting endothelial ion channels in cardioprotection. BIOMED RESEARCH INTERNATIONAL 2014; 2014:324364. [PMID: 25126553 PMCID: PMC4122001 DOI: 10.1155/2014/324364] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 06/16/2014] [Indexed: 11/28/2022]
Abstract
Vascular endothelium plays a critical role in the control of blood flow by producing vasoactive factors to regulate vascular tone. Ion channels, in particular, K+ channels and Ca2+-permeable channels in endothelial cells, are essential to the production and function of endothelium-derived vasoactive factors. Impairment of coronary endothelial function occurs in open heart surgery that may result in reduction of coronary blood flow and thus in an inadequate myocardial perfusion. Hyperkalemic exposure and concurrent ischemia-reperfusion during cardioplegic intervention compromise NO and EDHF-mediated function and the impairment involves alterations of K+ channels, that is, KATP and KCa, and Ca2+-permeable TRP channels in endothelial cells. Pharmacological modulation of these channels during ischemia-reperfusion and hyperkalemic exposure show promising results on the preservation of NO and EDHF-mediated endothelial function, which suggests the potential of targeting endothelial K+ and TRP channels for myocardial protection during cardiac surgery.
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AVE3085 protects coronary endothelium from the impairment of asymmetric dimethylarginine by activation and recoupling of eNOS. Cardiovasc Drugs Ther 2013; 26:383-92. [PMID: 22890813 DOI: 10.1007/s10557-012-6404-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of eNOS and it is recognized as a risk factor for endothelial dysfunction in cardiovascular diseases. We investigated the effect of AVE3085, a newly developed transcription enhancer of eNOS, on ADMA-induced endothelial dysfunction in coronary arteries with underlying mechanisms explored. METHODS Porcine coronary small arteries (diameter 600-800 μm) were studied in a myograph for endothelium-dependent relaxation to bradykinin and endothelium-independent relaxation to sodium nitroprusside. Protein expressions of eNOS and phosphorylated-eNOS (p-eNOS(Ser1177) and p-eNOS(Thr495)), and nitrotyrosine formation were determined by Western blot. NO release was directly measured with a NO microsensor. Productions of O(2) (.-) and peroxynitrite (ONOO(-)) were determined by lucigenin- and luminol- enhanced chemiluminescence respectively. RESULTS Exposure to ADMA significantly decreased the bradykinin-induced vasorelaxation and reduced the protein expression of p-eNOS(Ser1177) whereas increased the expression of p-eNOS(Thr495) and nitrotyrosine. Pre-incubation with AVE3085 restored the bradykinin-induced relaxation, reversed the decrease of p-eNOS(Ser1177), and lowered the level of p-eNOS(Thr495) and nitrotyrosine. NO release in response to bradykinin was significantly reduced by ADMA and such reduction was restored by AVE3085. AVE3085 also prevented the elevation of O (2) (.-) and ONOO(-) levels in coronary arteries exposed to ADMA. CONCLUSIONS AVE3085 prevents ADMA-induced endothelial dysfunction in coronary arteries. The protective effect of AVE3085 may be attributed to increased NO production resulting from enhanced eNOS activation, and decreased oxidative stress that involves inhibition of O (2) (.-) generation by eNOS recoupling. The present study suggested the therapeutic potential of AVE3085 in endothelial dysfunction in cardiovascular disorders.
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Kroigaard C, Kudryavtseva O, Dalsgaard T, Wandall-Frostholm C, Olesen SP, Simonsen U. KCa3.1 channel downregulation and impaired endothelium-derived hyperpolarization-type relaxation in pulmonary arteries from chronically hypoxic rats. Exp Physiol 2013; 98:957-69. [DOI: 10.1113/expphysiol.2012.066340] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Abstract
Based on the genetic relationship, single-channel conductance, and gating mechanisms, calcium-activated potassium (KCa) channels identified in vasculature can be divided into 3 groups including large-conductance KCa, small, and intermediate conductance KCa. KCa channels in smooth muscle and endothelial cells are essential for the regulation of vascular tone. Vascular dysfunction under ischemia-reperfusion (I-R) or hypoxia-reoxygenation (H-R) conditions is associated with modulations of KCa channels that are attributable to multiple mechanisms. Most studies in this regard relied on the change of relaxation components sensitive to certain channel blockers to indicate the alteration of KCa channels under I-R conditions, which however provided conflicting results for the effect of I-R. The possible mechanisms involved in KCa channel modulation under I-R/H-R include overproduction of reactive oxygen species such as superoxide anion, hydrogen peroxide, and peroxynitrite, increase of intracellular H ion, and lactate accumulation, etc. However, more studies are necessary to further understand the discrepancies in the sensitivity of KCa channels to I-R injury in different vascular beds.
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Yang Q, Shigemura N, Underwood MJ, Hsin M, Xue HM, Huang Y, He GW, Yu CM. NO and EDHF pathways in pulmonary arteries and veins are impaired in COPD patients. Vascul Pharmacol 2012; 57:113-8. [PMID: 22609132 DOI: 10.1016/j.vph.2012.05.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 03/29/2012] [Accepted: 05/09/2012] [Indexed: 01/22/2023]
Abstract
We investigated endothelial function of both pulmonary arteries and veins in patients with chronic obstructive pulmonary disease (COPD) of varying severity in regard to the role of nitric oxide (NO) and endothelium-derived hyperpolarizing factor (EDHF). Lung tissues were obtained from patients undergoing lobectomy or pneumonectomy. Patients were grouped to control, moderate COPD, and severe COPD according to the Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines. Pulmonary arteries and veins were studied for endothelium-dependent relaxations. NO concentration was measured by electrochemical method. Protein expressions of eNOS and phosphorylated eNOS were determined by Western-blot. Endothelium-dependent relaxation was more significant in pulmonary arteries than in veins. The vasorelaxation was decreased in patients of moderate COPD and further decreased in severe COPD. The severity of endothelial dysfunction in both pulmonary arteries and veins correlated with the degree of airflow obstruction. COPD patients exhibited reduced endothelial NO production, decreased eNOS protein expression and decreased eNOS phosphorylation. The EDHF component was abolished in the pulmonary vasculature of patients with severe COPD. NO and EDHF pathways are both involved in the regulation of vascular tone in human pulmonary arteries and veins. Both pathways are impaired in COPD patients and the severity of the impairment increases with the progress of the disease. Downregulation of eNOS expression and inhibition of eNOS activation underlie the reduction of NO in COPD patients.
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Affiliation(s)
- Qin Yang
- Division of Cardiology, Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong & TEDA International Cardiovascular Hospital, Medical College, Nankai University, Tianjin, China.
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Deshpande DD, Janero DR, Amiji MM. Therapeutic strategies for endothelial dysfunction. Expert Opin Biol Ther 2011; 11:1637-54. [DOI: 10.1517/14712598.2011.625007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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