1
|
Al-Owais MM, Hettiarachchi NT, Dallas ML, Scragg JL, Lippiat JD, Holden AV, Steele DS, Peers C. Inhibition of the voltage-gated potassium channel Kv1.5 by hydrogen sulfide attenuates remodeling through S-nitrosylation-mediated signaling. Commun Biol 2023; 6:651. [PMID: 37336943 PMCID: PMC10279668 DOI: 10.1038/s42003-023-05016-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 06/05/2023] [Indexed: 06/21/2023] Open
Abstract
The voltage-gated K+ channel plays a key role in atrial excitability, conducting the ultra-rapid rectifier K+ current (IKur) and contributing to the repolarization of the atrial action potential. In this study, we examine its regulation by hydrogen sulfide (H2S) in HL-1 cardiomyocytes and in HEK293 cells expressing human Kv1.5. Pacing induced remodeling resulted in shorting action potential duration, enhanced both Kv1.5 channel and H2S producing enzymes protein expression in HL-1 cardiomyocytes. H2S supplementation reduced these remodeling changes and restored action potential duration through inhibition of Kv1.5 channel. H2S also inhibited recombinant hKv1.5, lead to nitric oxide (NO) mediated S-nitrosylation and activated endothelial nitric oxide synthase (eNOS) by increased phosphorylation of Ser1177, prevention of NO formation precluded these effects. Regulation of Ikur by H2S has important cardiovascular implications and represents a novel and potential therapeutic target.
Collapse
Affiliation(s)
- Moza M Al-Owais
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
| | - Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| | - Mark L Dallas
- Reading School of Pharmacy, University of Reading, Reading, RG6 6UB, UK
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| | - Jonathan D Lippiat
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Arun V Holden
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Derek S Steele
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| |
Collapse
|
2
|
Schwartz CL, Edwards K, Gamble W, Kirkham A, Lacy P, Lewis P, McDonagh STJ, Peers C, Sheppard JP, Swales P, Howarth J, Williams B. Validation of the Kinetik Blood Pressure Monitor-Series 1 for use in adults at home and in clinical settings, according to the 2002 European Society of Hypertension International Protocol on the validation of blood pressure devices. J Hum Hypertens 2021; 35:1046-1050. [PMID: 33223524 DOI: 10.1038/s41371-020-00445-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 07/21/2020] [Accepted: 11/03/2020] [Indexed: 02/03/2023]
Abstract
The aim of this study was to assess the blood pressure (BP) measurement accuracy of the Kinetik Blood Pressure Monitor-Series 1 (BPM-1) for use in home or clinical settings according to the 2002 European Society of Hypertension International Protocol (ESH-IP). Forty-two participants were recruited to fulfil the required number of systolic and diastolic BP measurements according to the ESH-IP. Nine sequential same-arm BP readings were measured and analysed for each participant using the test device and observer mercury standard readings according to the 2002 ESH-IP. Forty one participants were used to obtain 33 sets of systolic and diastolic BP readings and were included in the analysis. Mean difference between the device measurements and the observer (mercury standard) measurements was 1.1 ± 7.2/1.1 ± 6.8 mmHg (mean ± standard deviation; systolic/diastolic). The number of systolic BP differences between the test and observer measurements that fell within 5, 10 and 15 mmHg was 65, 86 and 92. For diastolic readings, the number of test-observer measurement differences within 5, 10 and 15 mmHg was 77, 91 and 94. The number of participants with at least two out of three differences within 5 mmHg was 28 for systolic and 40 for diastolic BP readings. Three participants had no differences between the test and observer measurements within 5 mmHg in both the systolic and diastolic measurement categories. The Kinetik BPM-1 device fulfilled the requirements of the ESH-IP validation procedure and can be recommended for clinical use and self-measurement within the home.
Collapse
Affiliation(s)
- C L Schwartz
- Nuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, OX2 6GG, UK
| | - K Edwards
- University Hospitals of Leicester, Glenfield Hospital, Leicester, LE3 9QP, UK
| | - W Gamble
- University Hospitals of Leicester, Glenfield Hospital, Leicester, LE3 9QP, UK
| | - A Kirkham
- University Hospitals of Leicester, Glenfield Hospital, Leicester, LE3 9QP, UK
| | - P Lacy
- Institute of Cardiovascular Sciences, NIHR UCL Hospitals Biomedical Research Centre, University College London, 170 Tottenham Court Road, London, W1T 7HA, UK
| | - P Lewis
- Stockport NHS Foundation Trust, Stepping Hill Hospital, Stockport, SK2 7JE, UK
| | - S T J McDonagh
- Primary Care Research Group, University of Exeter Medical School, College of Medicine and Health, Smeall Building, St Luke's Campus, Exeter, UK
| | - C Peers
- University Hospitals of Leicester, Glenfield Hospital, Leicester, LE3 9QP, UK
| | - J P Sheppard
- Nuffield Department of Primary Care Health Sciences, NIHR School for Primary Care Research, University of Oxford, Radcliffe Observatory Quarter, Oxford, OX2 6GG, UK.
| | - P Swales
- University Hospitals of Leicester, Glenfield Hospital, Leicester, LE3 9QP, UK
| | - J Howarth
- British and Irish Hypertension Society, Leicester, UK
| | - B Williams
- Institute of Cardiovascular Sciences, NIHR UCL Hospitals Biomedical Research Centre, University College London, 170 Tottenham Court Road, London, W1T 7HA, UK
| |
Collapse
|
3
|
Dallas ML, Al-Owais MM, Hettiarachchi NT, Vandiver MS, Jarosz-Griffiths HH, Scragg JL, Boyle JP, Steele D, Peers C. Hydrogen sulfide regulates hippocampal neuron excitability via S-sulfhydration of Kv2.1. Sci Rep 2021; 11:8194. [PMID: 33854181 PMCID: PMC8046973 DOI: 10.1038/s41598-021-87646-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 03/31/2021] [Indexed: 02/02/2023] Open
Abstract
Hydrogen sulfide (H2S) is gaining interest as a mammalian signalling molecule with wide ranging effects. S-sulfhydration is one mechanism that is emerging as a key post translational modification through which H2S acts. Ion channels and neuronal receptors are key target proteins for S-sulfhydration and this can influence a range of neuronal functions. Voltage-gated K+ channels, including Kv2.1, are fundamental components of neuronal excitability. Here, we show that both recombinant and native rat Kv2.1 channels are inhibited by the H2S donors, NaHS and GYY4137. Biochemical investigations revealed that NaHS treatment leads to S-sulfhydration of the full length wild type Kv2.1 protein which was absent (as was functional regulation by H2S) in the C73A mutant form of the channel. Functional experiments utilising primary rat hippocampal neurons indicated that NaHS augments action potential firing and thereby increases neuronal excitability. These studies highlight an important role for H2S in shaping cellular excitability through S-sulfhydration of Kv2.1 at C73 within the central nervous system.
Collapse
Affiliation(s)
- Mark L Dallas
- Reading School of Pharmacy, University of Reading, Reading, RG6 6UB, UK.
| | - Moza M Al-Owais
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK.
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
| | - Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| | - Matthew Scott Vandiver
- Department of Neuroscience, John's Hopkins University School of Medicine, Baltimore, USA
| | | | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, UK
| | - Derek Steele
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Chris Peers
- Reading School of Pharmacy, University of Reading, Reading, RG6 6UB, UK
| |
Collapse
|
4
|
Styles FL, Al-Owais MM, Scragg JL, Chuntharpursat-Bon E, Hettiarachchi NT, Lippiat JD, Minard A, Bon RS, Porter K, Sukumar P, Peers C, Roberts LD. Kv1.3 voltage-gated potassium channels link cellular respiration to proliferation through a non-conducting mechanism. Cell Death Dis 2021; 12:372. [PMID: 33828089 PMCID: PMC8027666 DOI: 10.1038/s41419-021-03627-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 01/01/2023]
Abstract
Cellular energy metabolism is fundamental for all biological functions. Cellular proliferation requires extensive metabolic reprogramming and has a high energy demand. The Kv1.3 voltage-gated potassium channel drives cellular proliferation. Kv1.3 channels localise to mitochondria. Using high-resolution respirometry, we show Kv1.3 channels increase oxidative phosphorylation, independently of redox balance, mitochondrial membrane potential or calcium signalling. Kv1.3-induced respiration increased reactive oxygen species production. Reducing reactive oxygen concentrations inhibited Kv1.3-induced proliferation. Selective Kv1.3 mutation identified that channel-induced respiration required an intact voltage sensor and C-terminal ERK1/2 phosphorylation site, but is channel pore independent. We show Kv1.3 channels regulate respiration through a non-conducting mechanism to generate reactive oxygen species which drive proliferation. This study identifies a Kv1.3-mediated mechanism underlying the metabolic regulation of proliferation, which may provide a therapeutic target for diseases characterised by dysfunctional proliferation and cell growth.
Collapse
Affiliation(s)
- Faye L Styles
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Moza M Al-Owais
- Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Jason L Scragg
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | | | | | | | - Aisling Minard
- School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
| | - Robin S Bon
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Karen Porter
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | | | - Chris Peers
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK
| | - Lee D Roberts
- School of Medicine, University of Leeds, Leeds, LS2 9JT, UK.
| |
Collapse
|
5
|
Tsai YM, Jones F, Mullen P, Porter KE, Steele D, Peers C, Gamper N. Vascular Kv7 channels control intracellular Ca 2+ dynamics in smooth muscle. Cell Calcium 2020; 92:102283. [PMID: 32950876 PMCID: PMC7695684 DOI: 10.1016/j.ceca.2020.102283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/21/2020] [Accepted: 08/26/2020] [Indexed: 01/23/2023]
Abstract
Voltage-gated Kv7 (or KCNQ) channels control activity of excitable cells, including vascular smooth muscle cells (VSMCs), by setting their resting membrane potential and controlling other excitability parameters. Excitation-contraction coupling in muscle cells is mediated by Ca2+ but until now, the exact role of Kv7 channels in cytosolic Ca2+ dynamics in VSMCs has not been fully elucidated. We utilised microfluorimetry to investigate the impact of Kv7 channel activity on intracellular Ca2+ levels and electrical activity of rat A7r5 VSMCs and primary human internal mammary artery (IMA) SMCs. Both, direct (XE991) and G protein coupled receptor mediated (vasopressin, AVP) Kv7 channel inhibition induced robust Ca2+ oscillations, which were significantly reduced in the presence of Kv7 channel activator, retigabine, L-type Ca2+ channel inhibitor, nifedipine, or T-type Ca2+ channel inhibitor, NNC 55-0396, in A7r5 cells. Membrane potential measured using FluoVolt exhibited a slow depolarisation followed by a burst of sharp spikes in response to XE991; spikes were temporally correlated with Ca2+ oscillations. Phospholipase C inhibitor (edelfosine) reduced AVP-induced, but not XE991-induced Ca2+ oscillations. AVP and XE991 induced a large increase of [Ca2+]i in human IMA, which was also attenuated with retigabine, nifedipine and NNC 55-0396. RT-PCR, immunohistochemistry and electrophysiology suggested that Kv7.5 was the predominant Kv7 subunit in both rat and human arterial SMCs; CACNA1C (Cav1.2; L-type) and CACNA1 G (Cav3.1; T-type) were the most abundant voltage-gated Ca2+ channel gene transcripts in both types of VSMCs. This study establishes Kv7 channels as key regulators of Ca2+ signalling in VSMCs with Kv7.5 playing a dominant role.
Collapse
Affiliation(s)
- Yuan-Ming Tsai
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom; Division of Thoracic Surgery, Department of Surgery, Tri-Service General Hospital, National Defence Medical Centre, Taipei 11490, Taiwan.
| | - Frederick Jones
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Pierce Mullen
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Karen E Porter
- Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Derek Steele
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Chris Peers
- Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Nikita Gamper
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom.
| |
Collapse
|
6
|
Huang D, Shi S, Liang C, Zhang X, Du X, An H, Peers C, Zhang H, Gamper N. Delineating an extracellular redox-sensitive module in T-type Ca 2+ channels. J Biol Chem 2020; 295:6177-6186. [PMID: 32188693 PMCID: PMC7196644 DOI: 10.1074/jbc.ra120.012668] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/17/2020] [Indexed: 01/04/2023] Open
Abstract
T-type (Cav3) Ca2+ channels are important regulators of excitability and rhythmic activity of excitable cells. Among other voltage-gated Ca2+ channels, Cav3 channels are uniquely sensitive to oxidation and zinc. Using recombinant protein expression in HEK293 cells, patch clamp electrophysiology, site-directed mutagenesis, and homology modeling, we report here that modulation of Cav3.2 by redox agents and zinc is mediated by a unique extracellular module containing a high-affinity metal-binding site formed by the extracellular IS1–IS2 and IS3–IS4 loops of domain I and a cluster of extracellular cysteines in the IS1–IS2 loop. Patch clamp recording of recombinant Cav3.2 currents revealed that two cysteine-modifying agents, sodium (2-sulfonatoethyl) methanethiosulfonate (MTSES) and N-ethylmaleimide, as well as a reactive oxygen species–producing neuropeptide, substance P (SP), inhibit Cav3.2 current to similar degrees and that this inhibition is reversed by a reducing agent and a zinc chelator. Pre-application of MTSES prevented further SP-mediated current inhibition. Substitution of the zinc-binding residue His191 in Cav3.2 reduced the channel's sensitivity to MTSES, and introduction of the corresponding histidine into Cav3.1 sensitized it to MTSES. Removal of extracellular cysteines from the IS1–IS2 loop of Cav3.2 reduced its sensitivity to MTSES and SP. We hypothesize that oxidative modification of IS1–IS2 loop cysteines induces allosteric changes in the zinc-binding site of Cav3.2 so that it becomes sensitive to ambient zinc.
Collapse
Affiliation(s)
- Dongyang Huang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China; Institute of Chinese Integrative Medicine, Hebei Medical University, Shijiazhuang 050000, China
| | - Sai Shi
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, China; Key Laboratory of Molecular Biophysics, Hebei Province, Institute of Biophysics, School of Science, Hebei University of Technology, Tianjin 300401, China
| | - Ce Liang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China
| | - Xiaoyu Zhang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China
| | - Xiaona Du
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China
| | - Hailong An
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, China; Key Laboratory of Molecular Biophysics, Hebei Province, Institute of Biophysics, School of Science, Hebei University of Technology, Tianjin 300401, China
| | - Chris Peers
- Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Hailin Zhang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China.
| | - Nikita Gamper
- Department of Pharmacology, Hebei Medical University, Shijiazhuang 050000, China; Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
| |
Collapse
|
7
|
Cheng L, Al-Owais M, Covarrubias ML, Koch WJ, Manning DR, Peers C, Riobo-Del Galdo NA. Coupling of Smoothened to inhibitory G proteins reduces voltage-gated K + currents in cardiomyocytes and prolongs cardiac action potential duration. J Biol Chem 2018; 293:11022-11032. [PMID: 29802197 DOI: 10.1074/jbc.ra118.001989] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 05/10/2018] [Indexed: 12/25/2022] Open
Abstract
SMO (Smoothened), the central transducer of Hedgehog signaling, is coupled to heterotrimeric Gi proteins in many cell types, including cardiomyocytes. In this study, we report that activation of SMO with SHH (Sonic Hedgehog) or a small agonist, purmorphamine, rapidly causes a prolongation of the action potential duration that is sensitive to a SMO inhibitor. In contrast, neither of the SMO agonists prolonged the action potential in cardiomyocytes from transgenic GiCT/TTA mice, in which Gi signaling is impaired, suggesting that the effect of SMO is mediated by Gi proteins. Investigation of the mechanism underlying the change in action potential kinetics revealed that activation of SMO selectively reduces outward voltage-gated K+ repolarizing (Kv) currents in isolated cardiomyocytes and that it induces a down-regulation of membrane levels of Kv4.3 in cardiomyocytes and intact hearts from WT but not from GiCT/TTA mice. Moreover, perfusion of intact hearts with Shh or purmorphamine increased the ventricular repolarization time (QT interval) and induced ventricular arrhythmias. Our data constitute the first report that acute, noncanonical Hh signaling mediated by Gi proteins regulates K+ currents density in cardiomyocytes and sensitizes the heart to the development of ventricular arrhythmias.
Collapse
Affiliation(s)
- Lan Cheng
- From the Departments of Biochemistry & Molecular Biology and
| | - Moza Al-Owais
- the Leeds Institute of Cardiovascular and Metabolic Medicine and
| | | | - Walter J Koch
- the Department of Pharmacology and Center for Translational Medicine, Temple University, Philadelphia, Pennsylvania 19140, and
| | - David R Manning
- the Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
| | - Chris Peers
- the Leeds Institute of Cardiovascular and Metabolic Medicine and
| | - Natalia A Riobo-Del Galdo
- From the Departments of Biochemistry & Molecular Biology and .,the Leeds Institute of Cancer and Pathology, School of Medicine, University of Leeds, Leeds LS2 9JT, United Kingdom
| |
Collapse
|
8
|
Garnham J, Boyle J, Roberts LD, Peers C, Kearney MT, Bowen TS, Witte K. Diabetic heart failure patients demonstrate a mitochondrial complex I dependent impairment in skeletal muscle. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.903.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jack Garnham
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - John Boyle
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - Lee D. Roberts
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - Chris Peers
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - Mark T. Kearney
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - T. Scott Bowen
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| | - Klaus Witte
- Multidisciplinary Cardiovascular Research Centre (MCRC)Leeds Institute of Cardiovascular and Metabolic MedicineUniversity of LeedsUK
| |
Collapse
|
9
|
Gao H, Boillat A, Huang D, Liang C, Peers C, Gamper N. Modulation of KCNQ Channels by Intracellular Zinc. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.1720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
10
|
Kirton HM, Al-Owais M, Peers C, Steele DS. The EPAC2 Inhibitor ESI-05 Prolongs the Action Potential and Increases Susceptibility to EAD Arrhythmias. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
11
|
Al-Owais MM, Hettiarachchi NT, Boyle JP, Scragg JL, Elies J, Dallas ML, Lippiat JD, Steele DS, Peers C. Multiple mechanisms mediating carbon monoxide inhibition of the voltage-gated K + channel Kv1.5. Cell Death Dis 2017; 8:e3163. [PMID: 29095440 PMCID: PMC5775415 DOI: 10.1038/cddis.2017.568] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 09/19/2017] [Accepted: 09/21/2017] [Indexed: 12/13/2022]
Abstract
The voltage-gated K+ channel has key roles in the vasculature and in atrial excitability and contributes to apoptosis in various tissues. In this study, we have explored its regulation by carbon monoxide (CO), a product of the cytoprotective heme oxygenase enzymes, and a recognized toxin. CO inhibited recombinant Kv1.5 expressed in HEK293 cells in a concentration-dependent manner that involved multiple signalling pathways. CO inhibition was partially reversed by superoxide dismutase mimetics and by suppression of mitochondrial reactive oxygen species. CO also elevated intracellular nitric oxide (NO) levels. Prevention of NO formation also partially reversed CO inhibition of Kv1.5, as did inhibition of soluble guanylyl cyclase. CO also elevated intracellular peroxynitrite levels, and a peroxynitrite scavenger markedly attenuated the ability of CO to inhibit Kv1.5. CO caused nitrosylation of Kv1.5, an effect that was also observed in C331A and C346A mutant forms of the channel, which had previously been suggested as nitrosylation sites within Kv1.5. Augmentation of Kv1.5 via exposure to hydrogen peroxide was fully reversed by CO. Native Kv1.5 recorded in HL-1 murine atrial cells was also inhibited by CO. Action potentials recorded in HL-1 cells were increased in amplitude and duration by CO, an effect mimicked and occluded by pharmacological inhibition of Kv1.5. Our data indicate that Kv1.5 is a target for modulation by CO via multiple mechanisms. This regulation has important implications for diverse cellular functions, including excitability, contractility and apoptosis.
Collapse
Affiliation(s)
- Moza M Al-Owais
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Jacobo Elies
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Mark L Dallas
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Jon D Lippiat
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Derek S Steele
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| |
Collapse
|
12
|
Al-Owais MM, Hettiarachchi NT, Kirton HM, Hardy ME, Boyle JP, Scragg JL, Steele DS, Peers C. A key role for peroxynitrite-mediated inhibition of cardiac ERG (Kv11.1) K + channels in carbon monoxide-induced proarrhythmic early afterdepolarizations. FASEB J 2017; 31:4845-4854. [PMID: 28743763 PMCID: PMC5636698 DOI: 10.1096/fj.201700259r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 07/05/2017] [Indexed: 12/20/2022]
Abstract
Exposure to CO causes early afterdepolarization arrhythmias. Previous studies in rats have indicated that arrhythmias arose as a result of augmentation of the late Na+ current. The purpose of the present study was to examine the basis for CO-induced arrhythmias in guinea pig myocytes in which action potentials (APs) more closely resemble those of human myocytes. Whole-cell current- and voltage-clamp recordings were made from isolated guinea pig myocytes as well as from human embryonic kidney 293 (HEK293) cells that express wild-type or a C723S mutant form of ether-a-go-go-related gene (ERG; Kv11.1). We also monitored the formation of peroxynitrite (ONOO-) in HEK293 cells fluorimetrically. CO-applied as the CO-releasing molecule, CORM-2-prolonged the APs and induced early afterdepolarizations in guinea pig myocytes. In HEK293 cells, CO inhibited wild-type, but not C723S mutant, Kv11.1 K+ currents. Inhibition was prevented by an antioxidant, mitochondrial inhibitors, or inhibition of NO formation. CO also raised ONOO- levels, an effect that was reversed by the ONOO- scavenger, FeTPPS [5,10,15,20-tetrakis-(4-sulfonatophenyl)-porphyrinato-iron(III)], which also prevented the CO inhibition of Kv11.1 currents and abolished the effects of CO on Kv11.1 tail currents and APs in guinea pig myocytes. Our data suggest that CO induces arrhythmias in guinea pig cardiac myocytes via the ONOO--mediated inhibition of Kv11.1 K+ channels.-Al-Owais, M. M., Hettiarachchi, N. T., Kirton, H. M., Hardy, M. E., Boyle, J. P., Scragg, J. L., Steele, D. S., Peers, C. A key role for peroxynitrite-mediated inhibition of cardiac ERG (Kv11.1) K+ channels in carbon monoxide-induced proarrhythmic early afterdepolarizations.
Collapse
Affiliation(s)
- Moza M Al-Owais
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom; and
| | - Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom; and
| | - Hannah M Kirton
- Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Matthew E Hardy
- Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom; and
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom; and
| | - Derek S Steele
- Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom; and
| |
Collapse
|
13
|
Yang Z, Kirton HM, Al-Owais M, Thireau J, Richard S, Peers C, Steele DS. Epac2-Rap1 Signaling Regulates Reactive Oxygen Species Production and Susceptibility to Cardiac Arrhythmias. Antioxid Redox Signal 2017; 27:117-132. [PMID: 27649969 PMCID: PMC5510674 DOI: 10.1089/ars.2015.6485] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 09/19/2016] [Accepted: 09/19/2016] [Indexed: 12/19/2022]
Abstract
AIMS In the heart, β1-adrenergic signaling involves cyclic adenosine monophosphate (cAMP) acting via both protein kinase-A (PKA) and exchange protein directly activated by cAMP (Epac): a guanine nucleotide exchange factor for the small GTPase Rap1. Inhibition of Epac-Rap1 signaling has been proposed as a therapeutic strategy for both cancer and cardiovascular disease. However, previous work suggests that impaired Rap1 signaling may have detrimental effects on cardiac function. The aim of the present study was to investigate the influence of Epac2-Rap1 signaling on the heart using both in vivo and in vitro approaches. RESULTS Inhibition of Epac2 signaling induced early afterdepolarization arrhythmias in ventricular myocytes. The underlying mechanism involved an increase in mitochondrial reactive oxygen species (ROS) and activation of the late sodium current (INalate). Arrhythmias were blocked by inhibition of INalate or the mitochondria-targeted antioxidant, mitoTEMPO. In vivo, inhibition of Epac2 caused ventricular tachycardia, torsades de pointes, and sudden death. The in vitro and in vivo effects of Epac2 inhibition were mimicked by inhibition of geranylgeranyltransferase-1, which blocks interaction of Rap1 with downstream targets. INNOVATION Our findings show for the first time that Rap1 acts as a negative regulator of mitochondrial ROS production in the heart and that impaired Epac2-Rap1 signaling causes arrhythmias due to ROS-dependent activation of INalate. This has implications for the use of chemotherapeutics that target Epac2-Rap1 signaling. However, selective inhibition of INalate provides a promising strategy to prevent arrhythmias caused by impaired Epac2-Rap1 signaling. CONCLUSION Epac2-Rap1 signaling attenuates mitochondrial ROS production and reduces myocardial arrhythmia susceptibility. Antioxid. Redox Signal. 27, 117-132.
Collapse
Affiliation(s)
- Zhaokang Yang
- Faculty of Biological Sciences, School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Hannah M. Kirton
- Faculty of Biological Sciences, School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Moza Al-Owais
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom
| | - Jérôme Thireau
- PHYMEDEXP, Physiologie et Médecine Expérimentale, Cœur et Muscles, INSERM U1046, CNRS UMR 9214, Université de Montpellier, Montpellier, France
| | - Sylvain Richard
- PHYMEDEXP, Physiologie et Médecine Expérimentale, Cœur et Muscles, INSERM U1046, CNRS UMR 9214, Université de Montpellier, Montpellier, France
| | - Chris Peers
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom
| | - Derek S. Steele
- Faculty of Biological Sciences, School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| |
Collapse
|
14
|
Hettiarachchi NT, Boyle JP, Dallas ML, Al-Owais MM, Scragg JL, Peers C. Heme oxygenase-1 derived carbon monoxide suppresses Aβ 1-42 toxicity in astrocytes. Cell Death Dis 2017; 8:e2884. [PMID: 28617444 PMCID: PMC5520931 DOI: 10.1038/cddis.2017.276] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 04/19/2017] [Accepted: 05/12/2017] [Indexed: 12/27/2022]
Abstract
Neurodegeneration in Alzheimer's disease (AD) is extensively studied, and the involvement of astrocytes and other cell types in this process has been described. However, the responses of astrocytes themselves to amyloid β peptides ((Aβ; the widely accepted major toxic factor in AD) is less well understood. Here, we show that Aβ(1-42) is toxic to primary cultures of astrocytes. Toxicity does not involve disruption of astrocyte Ca2+ homeostasis, but instead occurs via formation of the toxic reactive species, peroxynitrite. Thus, Aβ(1-42) raises peroxynitrite levels in astrocytes, and Aβ(1-42) toxicity can be inhibited by antioxidants, or by inhibition of nitric oxide (NO) formation (reactive oxygen species (ROS) and NO combine to form peroxynitrite), or by a scavenger of peroxynitrite. Increased ROS levels observed following Aβ(1-42) application were derived from NADPH oxidase. Induction of haem oxygenase-1 (HO-1) protected astrocytes from Aβ(1-42) toxicity, and this protective effect was mimicked by application of the carbon monoxide (CO) releasing molecule CORM-2, suggesting HO-1 protection was attributable to its formation of CO. CO suppressed the rise of NADPH oxidase-derived ROS caused by Aβ(1-42). Under hypoxic conditions (0.5% O2, 48 h) HO-1 was induced in astrocytes and Aβ(1-42) toxicity was significantly reduced, an effect which was reversed by the specific HO-1 inhibitor, QC-15. Our data suggest that Aβ(1-42) is toxic to astrocytes, but that induction of HO-1 affords protection against this toxicity due to formation of CO. HO-1 induction, or CO donors, would appear to present attractive possible approaches to provide protection of both neuronal and non-neuronal cell types from the degenerative effects of AD in the central nervous system.
Collapse
Affiliation(s)
- Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, LICAMM Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, LICAMM Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Mark L Dallas
- Reading School of Pharmacy, University of Reading, Reading, RG6 6UB, UK
| | - Moza M Al-Owais
- Division of Cardiovascular and Diabetes Research, LICAMM Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, LICAMM Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, LICAMM Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| |
Collapse
|
15
|
Yang Z, Kirton HM, Al-Owais M, Peers C, Steele DS. Epac2-Rap1 Signaling Influences Reactive Oxygen Species Production and Susceptibility to Cardiac Arrhythmias. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
16
|
Cahill TJ, Leo V, Kelly M, Stockenhuber A, Kennedy NW, Bao L, Cereghetti GM, Harper AR, Czibik G, Liao C, Bellahcene M, Steeples V, Ghaffari S, Yavari A, Mayer A, Poulton J, Ferguson DJP, Scorrano L, Hettiarachchi NT, Peers C, Boyle J, Hill RB, Simmons A, Watkins H, Dear TN, Ashrafian H. Resistance of dynamin-related protein 1 oligomers to disassembly impairs mitophagy, resulting in myocardial inflammation and heart failure. J Biol Chem 2016; 291:25762. [PMID: 27913663 DOI: 10.1074/jbc.a115.665695] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
17
|
Huang D, Huang S, Gao H, Liu Y, Qi J, Chen P, Wang C, Scragg JL, Vakurov A, Peers C, Du X, Zhang H, Gamper N. Redox-Dependent Modulation of T-Type Ca(2+) Channels in Sensory Neurons Contributes to Acute Anti-Nociceptive Effect of Substance P. Antioxid Redox Signal 2016; 25:233-51. [PMID: 27306612 PMCID: PMC4971421 DOI: 10.1089/ars.2015.6560] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
AIMS Neuropeptide substance P (SP) is produced and released by a subset of peripheral sensory neurons that respond to tissue damage (nociceptors). SP exerts excitatory effects in the central nervous system, but peripheral SP actions are still poorly understood; therefore, here, we aimed at investigating these peripheral mechanisms. RESULTS SP acutely inhibited T-type voltage-gated Ca(2+) channels in nociceptors. The effect was mediated by neurokinin 1 (NK1) receptor-induced stimulation of intracellular release of reactive oxygen species (ROS), as it can be prevented or reversed by the reducing agent dithiothreitol and mimicked by exogenous or endogenous ROS. This redox-mediated T-type Ca(2+) channel inhibition operated through the modulation of CaV3.2 channel sensitivity to ambient zinc, as it can be prevented or reversed by zinc chelation and mimicked by exogenous zinc. Elimination of the zinc-binding site in CaV3.2 rendered the channel insensitive to SP-mediated inhibition. Importantly, peripherally applied SP significantly reduced bradykinin-induced nociception in rats in vivo; knock-down of CaV3.2 significantly reduced this anti-nociceptive effect. This atypical signaling cascade shared the initial steps with the SP-mediated augmentation of M-type K(+) channels described earlier. INNOVATION Our study established a mechanism underlying the peripheral anti-nociceptive effect of SP whereby this neuropeptide produces ROS-dependent inhibition of pro-algesic T-type Ca(2+) current and concurrent enhancement of anti-algesic M-type K(+) current. These findings will lead to a better understanding of mechanisms of endogenous analgesia. CONCLUSION SP modulates T-type channel activity in nociceptors by a redox-dependent tuning of channel sensitivity to zinc; this novel modulatory pathway contributes to the peripheral anti-nociceptive effect of SP. Antioxid. Redox Signal. 25, 233-251.
Collapse
Affiliation(s)
- Dongyang Huang
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Sha Huang
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Haixia Gao
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China .,2 School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds , Leeds, United Kingdom
| | - Yani Liu
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Jinlong Qi
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Pingping Chen
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Caixue Wang
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Jason L Scragg
- 3 Leeds Institute of Cardiovascular and Metabolic Medicine (LICAMM), Faculty of Medicine and Health, University of Leeds , Leeds, United Kingdom
| | - Alexander Vakurov
- 2 School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds , Leeds, United Kingdom
| | - Chris Peers
- 3 Leeds Institute of Cardiovascular and Metabolic Medicine (LICAMM), Faculty of Medicine and Health, University of Leeds , Leeds, United Kingdom
| | - Xiaona Du
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Hailin Zhang
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China
| | - Nikita Gamper
- 1 Department of Pharmacology, Hebei Medical University , Shijiazhuang, P.R. China .,2 School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds , Leeds, United Kingdom
| |
Collapse
|
18
|
Elies J, Scragg JL, Boyle JP, Gamper N, Peers C. Regulation of the T-type Ca(2+) channel Cav3.2 by hydrogen sulfide: emerging controversies concerning the role of H2 S in nociception. J Physiol 2016; 594:4119-29. [PMID: 26804000 DOI: 10.1113/jp270963] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 12/26/2015] [Indexed: 12/22/2022] Open
Abstract
Ion channels represent a large and growing family of target proteins regulated by gasotransmitters such as nitric oxide, carbon monoxide and, as described more recently, hydrogen sulfide. Indeed, many of the biological actions of these gases can be accounted for by their ability to modulate ion channel activity. Here, we report recent evidence that H2 S is a modulator of low voltage-activated T-type Ca(2+) channels, and discriminates between the different subtypes of T-type Ca(2+) channel in that it selectively modulates Cav3.2, whilst Cav3.1 and Cav3.3 are unaffected. At high concentrations, H2 S augments Cav3.2 currents, an observation which has led to the suggestion that H2 S exerts its pro-nociceptive effects via this channel, since Cav3.2 plays a central role in sensory nerve excitability. However, at more physiological concentrations, H2 S is seen to inhibit Cav3.2. This inhibitory action requires the presence of the redox-sensitive, extracellular region of the channel which is responsible for tonic metal ion binding and which particularly distinguishes this channel isoform from Cav3.1 and 3.3. Further studies indicate that H2 S may act in a novel manner to alter channel activity by potentiating the zinc sensitivity/affinity of this binding site. This review discusses the different reports of H2 S modulation of T-type Ca(2+) channels, and how such varying effects may impact on nociception given the role of this channel in sensory activity. This subject remains controversial, and future studies are required before the impact of T-type Ca(2+) channel modulation by H2 S might be exploited as a novel approach to pain management.
Collapse
Affiliation(s)
- Jacobo Elies
- Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Jason L Scragg
- Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - John P Boyle
- Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Nikita Gamper
- Faculty of Biological Sciences, School of Biomedical Sciences, University of Leeds, Leeds, UK.,Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Chris Peers
- Faculty of Medicine and Health, University of Leeds, Leeds, UK
| |
Collapse
|
19
|
Affiliation(s)
- Chris Peers
- a Division of Cardiovascular and Diabetes Research ; LICAMM; Faculty of Medicine and Health; University of Leeds ; Leeds , UK
| | | | | |
Collapse
|
20
|
Boillat A, Gao H, Peers C, Gamper N. Intracellular Zinc and Ascorbate Potentiate KCNQ Currents via Distinct Mechanisms. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.3243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
|
21
|
Hover S, King B, Hall B, Loundras EA, Taqi H, Daly J, Dallas M, Peers C, Schnettler E, McKimmie C, Kohl A, Barr JN, Mankouri J. Modulation of Potassium Channels Inhibits Bunyavirus Infection. J Biol Chem 2015; 291:3411-22. [PMID: 26677217 PMCID: PMC4751384 DOI: 10.1074/jbc.m115.692673] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Indexed: 11/06/2022] Open
Abstract
Bunyaviruses are considered to be emerging pathogens facilitated by the segmented nature of their genome that allows reassortment between different species to generate novel viruses with altered pathogenicity. Bunyaviruses are transmitted via a diverse range of arthropod vectors, as well as rodents, and have established a global disease range with massive importance in healthcare, animal welfare, and economics. There are no vaccines or anti-viral therapies available to treat human bunyavirus infections and so development of new anti-viral strategies is urgently required. Bunyamwera virus (BUNV; genus Orthobunyavirus) is the model bunyavirus, sharing aspects of its molecular and cellular biology with all Bunyaviridae family members. Here, we show for the first time that BUNV activates and requires cellular potassium (K(+)) channels to infect cells. Time of addition assays using K(+) channel modulating agents demonstrated that K(+) channel function is critical to events shortly after virus entry but prior to viral RNA synthesis/replication. A similar K(+) channel dependence was identified for other bunyaviruses namely Schmallenberg virus (Orthobunyavirus) as well as the more distantly related Hazara virus (Nairovirus). Using a rational pharmacological screening regimen, two-pore domain K(+) channels (K2P) were identified as the K(+) channel family mediating BUNV K(+) channel dependence. As several K2P channel modulators are currently in clinical use, our work suggests they may represent a new and safe drug class for the treatment of potentially lethal bunyavirus disease.
Collapse
Affiliation(s)
- Samantha Hover
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT
| | - Barnabas King
- School of Life Sciences, University of Nottingham, Nottingham NG7 2UH
| | - Bradley Hall
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT
| | - Eleni-Anna Loundras
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT
| | - Hussah Taqi
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT
| | - Janet Daly
- Veterinary Medicine and Science, University of Nottingham, Nottingham NG7 2RD
| | - Mark Dallas
- School of Pharmacy, University of Reading, Reading RG6 6AP, and
| | - Chris Peers
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT
| | - Esther Schnettler
- MRC-University of Glasgow Centre for Virus Research, Scotland, Glasgow G61 1QH, United Kingdom
| | - Clive McKimmie
- MRC-University of Glasgow Centre for Virus Research, Scotland, Glasgow G61 1QH, United Kingdom
| | - Alain Kohl
- MRC-University of Glasgow Centre for Virus Research, Scotland, Glasgow G61 1QH, United Kingdom
| | - John N Barr
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT,
| | - Jamel Mankouri
- From the School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT,
| |
Collapse
|
22
|
Parry DA, Holmes TD, Gamper N, El-Sayed W, Hettiarachchi NT, Ahmed M, Cook GP, Logan CV, Johnson CA, Joss S, Peers C, Prescott K, Savic S, Inglehearn CF, Mighell AJ. A homozygous STIM1 mutation impairs store-operated calcium entry and natural killer cell effector function without clinical immunodeficiency. J Allergy Clin Immunol 2015; 137:955-7.e8. [PMID: 26560041 PMCID: PMC4775071 DOI: 10.1016/j.jaci.2015.08.051] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/07/2015] [Accepted: 08/25/2015] [Indexed: 11/25/2022]
Affiliation(s)
- David A Parry
- Section of Ophthalmology and Neuroscience, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom; Section of Genetics, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Tim D Holmes
- Leeds Institute of Cancer and Pathology, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom; Center for Infectious Medicine, Karolinska University Hospital, Stockholm, Sweden
| | - Nikita Gamper
- School of Biomedical Sciences, University of Leeds, Leeds, United Kingdom
| | - Walid El-Sayed
- School of Dentistry, University of Leeds, Leeds, United Kingdom; Oral Biology Department, Dental Collage, Gulf Medical University, Ajman, United Arab Emirates
| | - Nishani T Hettiarachchi
- Division of Cardiovascular and Diabetes Research, School of Medicine, University of Leeds, Leeds, United Kingdom
| | - Mushtaq Ahmed
- Clinical Genetics, Leeds Teaching Hospitals NHS Trust, Chapel Allerton Hospital, Leeds, United Kingdom
| | - Graham P Cook
- Leeds Institute of Cancer and Pathology, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Clare V Logan
- Section of Genetics, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Colin A Johnson
- Section of Ophthalmology and Neuroscience, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Shelagh Joss
- Clinical Genetics, Southern General Hospital, Glasgow, United Kingdom
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, School of Medicine, University of Leeds, Leeds, United Kingdom
| | - Katrina Prescott
- Clinical Genetics, Leeds Teaching Hospitals NHS Trust, Chapel Allerton Hospital, Leeds, United Kingdom
| | - Sinisa Savic
- Department of Clinical Immunology and Allergy, Leeds Teaching Hospitals NHS Trust, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Chris F Inglehearn
- Section of Ophthalmology and Neuroscience, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom
| | - Alan J Mighell
- Section of Ophthalmology and Neuroscience, School of Medicine, St James's University Hospital, University of Leeds, Leeds, United Kingdom; School of Dentistry, University of Leeds, Leeds, United Kingdom.
| |
Collapse
|
23
|
Yang Z, Kirton HM, MacDougall DA, Boyle JP, Deuchars J, Frater B, Ponnambalam S, Hardy ME, White E, Calaghan SC, Peers C, Steele DS. The Golgi apparatus is a functionally distinct Ca2+ store regulated by the PKA and Epac branches of the β1-adrenergic signaling pathway. Sci Signal 2015; 8:ra101. [PMID: 26462734 DOI: 10.1126/scisignal.aaa7677] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ca(2+) release from the Golgi apparatus regulates key functions of the organelle, including vesicle trafficking. We found that the Golgi apparatus was the source of prolonged Ca(2+) release events that originated near the nuclei of primary cardiomyocytes. Golgi Ca(2+) release was unaffected by depletion of sarcoplasmic reticulum Ca(2+), and disruption of the Golgi apparatus abolished Golgi Ca(2+) release without affecting sarcoplasmic reticulum function, suggesting functional and spatial independence of Golgi and sarcoplasmic reticulum Ca(2+) stores. β1-Adrenoceptor stimulation triggers the production of the second messenger cAMP, which activates the Epac family of Rap guanine nucleotide exchange factors and the kinase PKA (protein kinase A). Phosphodiesterases (PDEs), including those in the PDE3 and PDE4 families, degrade cAMP. Activation of β1-adrenoceptors stimulated Golgi Ca(2+) release, an effect that required activation of Epac, PKA, and the kinase CaMKII. Inhibition of PDE3s or PDE4s potentiated β1-adrenergic-induced Golgi Ca(2+) release, which is consistent with compartmentalization of cAMP signaling near the Golgi apparatus. Interventions that stimulated Golgi Ca(2+) release appeared to increase the trafficking of vascular endothelial growth factor receptor-1 (VEGFR-1) from the Golgi apparatus to the surface membrane of cardiomyocytes. In cardiomyocytes from rats with heart failure, decreases in the abundance of PDE3s and PDE4s were associated with increased Golgi Ca(2+) release events. These data suggest that the Golgi apparatus is a focal point for β1-adrenergic-stimulated Ca(2+) signaling and that the Golgi Ca(2+) store functions independently from the sarcoplasmic reticulum and the global Ca(2+) transients that trigger contraction in cardiomyocytes.
Collapse
Affiliation(s)
- Zhaokang Yang
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK.
| | - Hannah M Kirton
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | | | - John P Boyle
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - James Deuchars
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Brenda Frater
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | | | - Matthew E Hardy
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Edward White
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Sarah C Calaghan
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Chris Peers
- Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds LS2 9JT, UK
| | - Derek S Steele
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK.
| |
Collapse
|
24
|
Cahill TJ, Leo V, Kelly M, Stockenhuber A, Kennedy NW, Bao L, Cereghetti GM, Harper AR, Czibik G, Liao C, Bellahcene M, Steeples V, Ghaffari S, Yavari A, Mayer A, Poulton J, Ferguson DJP, Scorrano L, Hettiarachchi NT, Peers C, Boyle J, Hill RB, Simmons A, Watkins H, Dear TN, Ashrafian H. Resistance of Dynamin-related Protein 1 Oligomers to Disassembly Impairs Mitophagy, Resulting in Myocardial Inflammation and Heart Failure. J Biol Chem 2015; 290:25907-19. [PMID: 26370078 DOI: 10.1074/jbc.m115.665695] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Indexed: 11/06/2022] Open
Abstract
We have reported previously that a missense mutation in the mitochondrial fission gene Dynamin-related protein 1 (Drp1) underlies the Python mouse model of monogenic dilated cardiomyopathy. The aim of this study was to investigate the consequences of the C452F mutation on Drp1 protein function and to define the cellular sequelae leading to heart failure in the Python monogenic dilated cardiomyopathy model. We found that the C452F mutation increased Drp1 GTPase activity. The mutation also conferred resistance to oligomer disassembly by guanine nucleotides and high ionic strength solutions. In a mouse embryonic fibroblast model, Drp1 C452F cells exhibited abnormal mitochondrial morphology and defective mitophagy. Mitochondria in C452F mouse embryonic fibroblasts were depolarized and had reduced calcium uptake with impaired ATP production by oxidative phosphorylation. In the Python heart, we found a corresponding progressive decline in oxidative phosphorylation with age and activation of sterile inflammation. As a corollary, enhancing autophagy by exposure to a prolonged low-protein diet improved cardiac function in Python mice. In conclusion, failure of Drp1 disassembly impairs mitophagy, leading to a downstream cascade of mitochondrial depolarization, aberrant calcium handling, impaired ATP synthesis, and activation of sterile myocardial inflammation, resulting in heart failure.
Collapse
Affiliation(s)
| | - Vincenzo Leo
- the Leeds Institute of Molecular Medicine, Wellcome Trust Brenner Building, St. James's University Hospital, Leeds LS9 7TF, United Kingdom
| | | | | | - Nolan W Kennedy
- the Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Leyuan Bao
- Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine, and
| | - Grazia M Cereghetti
- the Department of Cell Physiology and Metabolism, University of Geneva, Geneva, CH-1211, Switzerland, and
| | | | | | - Chunyan Liao
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford OX3 9DU, United Kingdom
| | | | | | | | | | - Alice Mayer
- Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine, and
| | - Joanna Poulton
- Nuffield Department of Obstetrics and Gynaecology, University of Oxford, Oxford OX3 9DU, United Kingdom
| | | | - Luca Scorrano
- the Department of Cell Physiology and Metabolism, University of Geneva, Geneva, CH-1211, Switzerland, and
| | - Nishani T Hettiarachchi
- the Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Chris Peers
- the Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - John Boyle
- the Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - R Blake Hill
- the Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Alison Simmons
- Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine, and
| | | | - T Neil Dear
- the Leeds Institute of Molecular Medicine, Wellcome Trust Brenner Building, St. James's University Hospital, Leeds LS9 7TF, United Kingdom
| | | |
Collapse
|
25
|
Martin HL, Alsaady I, Howell G, Prandovszky E, Peers C, Robinson P, McConkey GA. Effect of parasitic infection on dopamine biosynthesis in dopaminergic cells. Neuroscience 2015; 306:50-62. [PMID: 26297895 PMCID: PMC4577654 DOI: 10.1016/j.neuroscience.2015.08.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Revised: 08/02/2015] [Accepted: 08/03/2015] [Indexed: 12/31/2022]
Abstract
Infection by the neurotropic agent Toxoplasma gondii alters rodent behavior and can result in neuropsychiatric symptoms in humans. Little is understood regarding the effects of infection on host neural processes but alterations to dopaminergic neurotransmission are implicated. We have previously reported elevated levels of dopamine (DA) in infected dopaminergic cells however the involvement of the host enzymes and fate of the produced DA were not defined. In order to clarify the effects of infection on host DA biosynthetic enzymes and DA packaging we examined enzyme levels and activity and DA accumulation and release in T. gondii-infected neurosecretory cells. Although the levels of the host tyrosine hydroxylase (TH) and DOPA decarboxylase and AADC (DDC) did not change significantly in infected cultures, DDC was found within the parasitophorous vacuole (PV), the vacuolar compartment where the parasites reside, as well as in the host cytosol in infected dopaminergic cells. Strikingly, DDC was found within the intracellular parasite cysts in infected brain tissue. This finding could provide some explanation for observations of DA within tissue cysts in infected brain as a parasite-encoded enzyme with TH activity was also localized within tissue cysts. In contrast, cellular DA packaging appeared unchanged in single-cell microamperometry experiments and only a fraction of the increased DA was accessible to high potassium-induced release. This study provides some understanding of how this parasite produces elevated DA within dopaminergic cells without the toxic ramifications of free cytosolic DA. The mechanism for synthesis and packaging of DA by T. gondii-infected dopaminergic cells may have important implications for the effects of chronic T. gondii infection on humans and animals.
Collapse
Affiliation(s)
- H L Martin
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - I Alsaady
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - G Howell
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - E Prandovszky
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - C Peers
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - P Robinson
- The Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds LS9 7FT, United Kingdom
| | - G A McConkey
- Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
| |
Collapse
|
26
|
Huang D, Huang S, Peers C, Du X, Zhang H, Gamper N. GABAB receptors inhibit low-voltage activated and high-voltage activated Ca(2+) channels in sensory neurons via distinct mechanisms. Biochem Biophys Res Commun 2015; 465:188-93. [PMID: 26239659 DOI: 10.1016/j.bbrc.2015.07.137] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 07/28/2015] [Indexed: 12/16/2022]
Abstract
Growing evidence suggests that mammalian peripheral somatosensory neurons express functional receptors for gamma-aminobutyric acid, GABAA and GABAB. Moreover, local release of GABA by pain-sensing (nociceptive) nerve fibres has also been suggested. Yet, the functional significance of GABA receptor triggering in nociceptive neurons is not fully understood. Here we used patch-clamp recordings from small-diameter cultured DRG neurons to investigate effects of GABAB receptor agonist baclofen on voltage-gated Ca(2+) currents. We found that baclofen inhibited both low-voltage activated (LVA, T-type) and high-voltage activated (HVA) Ca(2+) currents in a proportion of DRG neurons by 22% and 32% respectively; both effects were sensitive to Gi/o inhibitor pertussis toxin. Inhibitory effect of baclofen on both current types was about twice less efficacious as compared to that of the μ-opioid receptor agonist DAMGO. Surprisingly, only HVA but not LVA current modulation by baclofen was partially prevented by G protein inhibitor GDP-β-S. In contrast, only LVA but not HVA current modulation was reversed by the application of a reducing agent dithiothreitol (DTT). Inhibition of T-type Ca(2+) current by baclofen and the recovery of such inhibition by DTT were successfully reconstituted in the expression system. Our data suggest that inhibition of LVA current in DRG neurons by baclofen is partially mediated by an unconventional signaling pathway that involves a redox mechanism. These findings reinforce the idea of targeting peripheral GABA receptors for pain relief.
Collapse
Affiliation(s)
- Dongyang Huang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, 050011, PR China
| | - Sha Huang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, 050011, PR China
| | - Chris Peers
- Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | - Xiaona Du
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, 050011, PR China
| | - Hailin Zhang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, 050011, PR China.
| | - Nikita Gamper
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, 050011, PR China; School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK.
| |
Collapse
|
27
|
Elies J, Johnson E, Boyle JP, Scragg JL, Peers C. H2S does not regulate proliferation via T-type Ca2+ channels. Biochem Biophys Res Commun 2015; 461:659-64. [PMID: 25918023 DOI: 10.1016/j.bbrc.2015.04.087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 04/17/2015] [Indexed: 01/08/2023]
Abstract
T-type Ca(2+) channels (Cav3.1, 3.2 and 3.3) strongly influence proliferation of various cell types, including vascular smooth muscle cells (VSMCs) and certain cancers. We have recently shown that the gasotransmitter carbon monoxide (CO) inhibits T-type Ca(2+) channels and, in so doing, attenuates proliferation of VSMC. We have also shown that the T-type Ca(2+) channel Cav3.2 is selectively inhibited by hydrogen sulfide (H2S) whilst the other channel isoforms (Cav3.1 and Cav3.3) are unaffected. Here, we explored whether inhibition of Cav3.2 by H2S could account for the anti-proliferative effects of this gasotransmitter. H2S suppressed proliferation in HEK293 cells expressing Cav3.2, as predicted by our previous observations. However, H2S was similarly effective in suppressing proliferation in wild type (non-transfected) HEK293 cells and those expressing the H2S insensitive channel, Cav3.1. Further studies demonstrated that T-type Ca(2+) channels in the smooth muscle cell line A7r5 and in human coronary VSMCs strongly influenced proliferation. In both cell types, H2S caused a concentration-dependent inhibition of proliferation, yet by far the dominant T-type Ca(2+) channel isoform was the H2S-insensitive channel, Cav3.1. Our data indicate that inhibition of T-type Ca(2+) channel-mediated proliferation by H2S is independent of the channels' sensitivity to H2S.
Collapse
Affiliation(s)
- Jacobo Elies
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Emily Johnson
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, LICAMM, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, UK.
| |
Collapse
|
28
|
Peers C, Boyle JP, Scragg JL, Dallas ML, Al-Owais MM, Hettiarachichi NT, Elies J, Johnson E, Gamper N, Steele DS. Diverse mechanisms underlying the regulation of ion channels by carbon monoxide. Br J Pharmacol 2015; 172:1546-56. [PMID: 24818840 PMCID: PMC4369263 DOI: 10.1111/bph.12760] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 04/14/2014] [Accepted: 04/21/2014] [Indexed: 12/19/2022] Open
Abstract
Carbon monoxide (CO) is firmly established as an important, physiological signalling molecule as well as a potent toxin. Through its ability to bind metal-containing proteins, it is known to interfere with a number of intracellular signalling pathways, and such actions can account for its physiological and pathological effects. In particular, CO can modulate the intracellular production of reactive oxygen species, NO and cGMP levels, as well as regulate MAPK signalling. In this review, we consider ion channels as more recently discovered effectors of CO signalling. CO is now known to regulate a growing number of different ion channel types, and detailed studies of the underlying mechanisms of action are revealing unexpected findings. For example, there are clear areas of contention surrounding its ability to increase the activity of high conductance, Ca(2+) -sensitive K(+) channels. More recent studies have revealed the ability of CO to inhibit T-type Ca(2+) channels and have unveiled a novel signalling pathway underlying tonic regulation of this channel. It is clear that the investigation of ion channels as effectors of CO signalling is in its infancy, and much more work is required to fully understand both the physiological and the toxic actions of this gas. Only then can its emerging use as a therapeutic tool be fully and safely exploited.
Collapse
Affiliation(s)
- C Peers
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - J P Boyle
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - J L Scragg
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - M L Dallas
- School of Pharmacy, University of ReadingReading, UK
| | - M M Al-Owais
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - N T Hettiarachichi
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - J Elies
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - E Johnson
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of LeedsLeeds, UK
| | - N Gamper
- Faculty of Biological Sciences, University of LeedsLeeds, UK
| | - D S Steele
- Faculty of Biological Sciences, University of LeedsLeeds, UK
| |
Collapse
|
29
|
Abstract
SIGNIFICANCE Oxidative stress and damage are well-established components of neurodegenerative diseases, contributing to neuronal death during disease progression. Here, we consider key K(+) channels as target proteins that can undergo oxidative modulation, describe what is understood about how this influences disease progression, and consider regulation of these channels by gasotransmitters as a means of cellular protection. RECENT ADVANCES Oxidative regulation of the delayed rectifier Kv2.1 and the Ca(2+)- and voltage-sensitive BK channel are established, but recent studies contest how their redox sensitivity contributes to altered excitability, progression of neurodegenerative diseases, and healthy aging. CRITICAL ISSUES Both Kv2.1 and BK channels have recently been established as target proteins for regulation by the gasotransmitters carbon monoxide and hydrogen sulfide. Establishing the molecular basis of such regulation, and exactly how this influences excitability and vulnerability to apoptotic cell death will determine whether such regulation can be exploited for therapeutic benefit. FUTURE DIRECTIONS Developing a more comprehensive picture of the oxidative modulation of K(+) channels (and, indeed, other ion channels) within the central nervous system in health and disease will enable us to better understand processes associated with healthy aging as well as distinct processes underlying progression of neurodegenerative diseases. Advances in the growing understanding of how gasotransmitters can regulate ion channels, including redox-sensitive K(+) channels, are a research priority for this field, and will establish their usefulness in design of future approaches for the treatment of such diseases.
Collapse
Affiliation(s)
- Chris Peers
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine (LICAMM), Faculty of Medicine and Health, University of Leeds , Leeds, United Kingdom
| | | |
Collapse
|
30
|
Peers C, Kumar P, Wyatt C, Gauda E, Nurse C, Prabhakar N. This volume of Advances in Experimental Medicine and Biology holds the proceedings of the XVIIIth meeting. Introduction. Adv Exp Med Biol 2015; 860:v-vi. [PMID: 26605404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
|
31
|
Abstract
Carotid bodies detect hypoxia in arterial blood, translating this stimulus into physiological responses via the CNS. It is long established that ion channels are critical to this process. More recent evidence indicates that gasotransmitters exert powerful influences on O2 sensing by the carotid body. Here, we review current understanding of hypoxia-dependent production of gasotransmitters, how they regulate ion channels in the carotid body, and how this impacts carotid body function.
Collapse
Affiliation(s)
- Nanduri R Prabhakar
- Institute for Integrative Physiology and Center for Systems Biology of O2 Sensing, Biological Sciences Division, University of Chicago, Chicago, Illinois; and
| | | |
Collapse
|
32
|
Elies J, Scragg JL, Huang S, Dallas ML, Huang D, MacDougall D, Boyle JP, Gamper N, Peers C. Hydrogen sulfide inhibits Cav3.2 T-type Ca2+ channels. FASEB J 2014; 28:5376-87. [PMID: 25183670 DOI: 10.1096/fj.14-257113] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The importance of H2S as a physiological signaling molecule continues to develop, and ion channels are emerging as a major family of target proteins through which H2S exerts many actions. The purpose of the present study was to investigate its effects on T-type Ca(2+) channels. Using patch-clamp electrophysiology, we demonstrate that the H2S donor, NaHS (10 μM-1 mM) selectively inhibits Cav3.2 T-type channels heterologously expressed in HEK293 cells, whereas Cav3.1 and Cav3.3 channels were unaffected. The sensitivity of Cav3.2 channels to H2S required the presence of the redox-sensitive extracellular residue H191, which is also required for tonic binding of Zn(2+) to this channel. Chelation of Zn(2+) with N,N,N',N'-tetra-2-picolylethylenediamine prevented channel inhibition by H2S and also reversed H2S inhibition when applied after H2S exposure, suggesting that H2S may act via increasing the affinity of the channel for extracellular Zn(2+) binding. Inhibition of native T-type channels in 3 cell lines correlated with expression of Cav3.2 and not Cav3.1 channels. Notably, H2S also inhibited native T-type (primarily Cav3.2) channels in sensory dorsal root ganglion neurons. Our data demonstrate a novel target for H2S regulation, the T-type Ca(2+) channel Cav3.2, and suggest that such modulation cannot account for the pronociceptive effects of this gasotransmitter.
Collapse
Affiliation(s)
- Jacobo Elies
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, and
| | - Jason L Scragg
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, and
| | - Sha Huang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China; and
| | - Mark L Dallas
- School of Pharmacy, University of Reading, Reading, UK
| | - Dongyang Huang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China; and
| | - David MacDougall
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK
| | - John P Boyle
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, and
| | - Nikita Gamper
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, UK; Department of Pharmacology, Hebei Medical University, Shijiazhuang, China; and
| | - Chris Peers
- Division of Cardiovascular and Diabetes Research, Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, and
| |
Collapse
|
33
|
|
34
|
Abstract
Sublethal carbon monoxide (CO) exposure is frequently associated with myocardial arrhythmias, and our recent studies have demonstrated that these may be attributable to modulation of cardiac Na(+) channels, causing an increase in the late current and an inhibition of the peak current. Using a recombinant expression system, we demonstrate that CO inhibits peak human Nav1.5 current amplitude without activation of the late Na(+) current observed in native tissue. Inhibition was associated with a hyperpolarizing shift in the steady-state inactivation properties of the channels and was unaffected by modification of channel gating induced by anemone toxin (rATX-II). Systematic pharmacological assessment indicated that no recognized CO-sensitive intracellular signaling pathways appeared to mediate CO inhibition of Nav1.5. Inhibition was, however, markedly suppressed by inhibition of NO formation, but NO donors did not mimic or occlude channel inhibition by CO, indicating that NO alone did not account for the actions of CO. Exposure of cells to DTT immediately before CO exposure also dramatically reduced the magnitude of current inhibition. Similarly, l-cysteine and N-ethylmaleimide significantly attenuated the inhibition caused by CO. In the presence of DTT and the NO inhibitor N(ω)-nitro-L-arginine methyl ester hydrochloride, the ability of CO to inhibit Nav1.5 was almost fully prevented. Our data indicate that inhibition of peak Na(+) current (which can lead to Brugada syndrome-like arrhythmias) occurs via a mechanism distinct from induction of the late current, requires NO formation, and is dependent on channel redox state.
Collapse
Affiliation(s)
- Jacobo Elies
- From the Division of Cardiovascular and Diabetes Research, Leeds Institute of Genetics, Health and Therapeutics, Faculty of Medicine and Health and
| | - Mark L Dallas
- From the Division of Cardiovascular and Diabetes Research, Leeds Institute of Genetics, Health and Therapeutics, Faculty of Medicine and Health and
| | - John P Boyle
- From the Division of Cardiovascular and Diabetes Research, Leeds Institute of Genetics, Health and Therapeutics, Faculty of Medicine and Health and
| | - Jason L Scragg
- From the Division of Cardiovascular and Diabetes Research, Leeds Institute of Genetics, Health and Therapeutics, Faculty of Medicine and Health and
| | - Adrian Duke
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Derek S Steele
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Chris Peers
- From the Division of Cardiovascular and Diabetes Research, Leeds Institute of Genetics, Health and Therapeutics, Faculty of Medicine and Health and
| |
Collapse
|
35
|
Elies J, Boyle JP, Dallas ML, MacDougall DA, Gamper N, Huang D, Scragg JL, Peers C. P64 Hydrogen sulfide inhibits Cav 3.2 T-type Ca2+ channels. Nitric Oxide 2014. [DOI: 10.1016/j.niox.2014.03.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
36
|
Duckles H, Boycott HE, Al-Owais MM, Elies J, Johnson E, Dallas ML, Porter KE, Giuntini F, Boyle JP, Scragg JL, Peers C. Heme oxygenase-1 regulates cell proliferation via carbon monoxide-mediated inhibition of T-type Ca2+ channels. Pflugers Arch 2014; 467:415-27. [PMID: 24744106 PMCID: PMC4293494 DOI: 10.1007/s00424-014-1503-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 03/14/2014] [Accepted: 03/14/2014] [Indexed: 11/24/2022]
Abstract
Induction of the antioxidant enzyme heme oxygenase-1 (HO-1) affords cellular protection and suppresses proliferation of vascular smooth muscle cells (VSMCs) associated with a variety of pathological cardiovascular conditions including myocardial infarction and vascular injury. However, the underlying mechanisms are not fully understood. Over-expression of Cav3.2 T-type Ca2+ channels in HEK293 cells raised basal [Ca2+]i and increased proliferation as compared with non-transfected cells. Proliferation and [Ca2+]i levels were reduced to levels seen in non-transfected cells either by induction of HO-1 or exposure of cells to the HO-1 product, carbon monoxide (CO) (applied as the CO releasing molecule, CORM-3). In the aortic VSMC line A7r5, proliferation was also inhibited by induction of HO-1 or by exposure of cells to CO, and patch-clamp recordings indicated that CO inhibited T-type (as well as L-type) Ca2+ currents in these cells. Finally, in human saphenous vein smooth muscle cells, proliferation was reduced by T-type channel inhibition or by HO-1 induction or CO exposure. The effects of T-type channel blockade and HO-1 induction were non-additive. Collectively, these data indicate that HO-1 regulates proliferation via CO-mediated inhibition of T-type Ca2+ channels. This signalling pathway provides a novel means by which proliferation of VSMCs (and other cells) may be regulated therapeutically.
Collapse
Affiliation(s)
- Hayley Duckles
- Division of Cardiovascular and Diabetes Research, LIGHT, Faculty of Medicine and Health, University of Leeds, Clarendon Way, Leeds, LS2 9JT, UK
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Karttunen S, Duffield M, Scrimgeour NR, Squires L, Lim WL, Dallas ML, Scragg JL, Chicher J, Dave KA, Whitelaw ML, Peers C, Gorman JJ, Gleadle JM, Rychkov GY, Peet DJ. Oxygen-dependent hydroxylation by Factor Inhibiting HIF (FIH) regulates the TRPV3 ion channel. J Cell Sci 2014; 128:225-31. [DOI: 10.1242/jcs.158451] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Factor Inhibiting HIF (FIH) is an oxygen-dependent asparaginyl hydroxylase that regulates the hypoxia-inducible factors (HIFs). Several proteins containing ankyrin repeat domains have been characterised as substrates of FIH, although there is little evidence for a functional consequence of hydroxylation on these substrates. This study demonstrates that the transient receptor potential vanilloid 3 (TRPV3) channel is hydroxylated by FIH on asparagine 242 within the cytoplasmic ankyrin repeat domain. Hypoxia, FIH inhibitors and mutation of asparagine 242 all potentiated TRPV3-mediated current, without altering TRPV3 protein levels, indicating that oxygen-dependent hydroxylation inhibits TRPV3 activity. This novel mechanism of channel regulation by oxygen-dependent asparaginyl hydroxylation is likely to extend to other ion channels.
Collapse
|
38
|
Amako Y, Igloi Z, Mankouri J, Kazlauskas A, Saksela K, Dallas M, Peers C, Harris M. Hepatitis C virus NS5A inhibits mixed lineage kinase 3 to block apoptosis. J Biol Chem 2013; 288:24753-63. [PMID: 23857585 PMCID: PMC3750171 DOI: 10.1074/jbc.m113.491985] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 07/12/2013] [Indexed: 01/28/2023] Open
Abstract
Hepatitis C virus (HCV) infection results in the activation of numerous stress responses including oxidative stress, with the potential to induce an apoptotic state. Previously we have shown that HCV attenuates the stress-induced, p38MAPK-mediated up-regulation of the K(+) channel Kv2.1, to maintain the survival of infected cells in the face of cellular stress. We demonstrated that this effect was mediated by HCV non-structural 5A (NS5A) protein, which impaired p38MAPK activity through a polyproline motif-dependent interaction, resulting in reduction of phosphorylation activation of Kv2.1. In this study, we investigated the host cell proteins targeted by NS5A to mediate Kv2.1 inhibition. We screened a phage-display library expressing the entire complement of human SH3 domains for novel NS5A-host cell interactions. This analysis identified mixed lineage kinase 3 (MLK3) as a putative NS5A interacting partner. MLK3 is a serine/threonine protein kinase that is a member of the MAPK kinase kinase (MAP3K) family and activates p38MAPK. An NS5A-MLK3 interaction was confirmed by co-immunoprecipitation and Western blot analysis. We further demonstrate a novel role of MLK3 in the modulation of Kv2.1 activity, whereby MLK3 overexpression leads to the up-regulation of channel activity. Accordingly, coexpression of NS5A suppressed this stimulation. Additionally we demonstrate that overexpression of MLK3 induced apoptosis, which was also counteracted by NS5A. We conclude that NS5A targets MLK3 with multiple downstream consequences for both apoptosis and K(+) homeostasis.
Collapse
Affiliation(s)
- Yutaka Amako
- From the School of Molecular and Cellular Biology, Faculty of Biological Sciences and
| | - Zsofia Igloi
- From the School of Molecular and Cellular Biology, Faculty of Biological Sciences and
| | - Jamel Mankouri
- From the School of Molecular and Cellular Biology, Faculty of Biological Sciences and
| | - Arunas Kazlauskas
- the Department of Virology, Haartman Institute, University of Helsinki Central Hospital, University of Helsinki and HUSLAB, FI-00014 Helsinki, Finland
| | - Kalle Saksela
- the Department of Virology, Haartman Institute, University of Helsinki Central Hospital, University of Helsinki and HUSLAB, FI-00014 Helsinki, Finland
| | - Mark Dallas
- the Division of Cardiovascular and Diabetes Research, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, United Kingdom and
| | - Chris Peers
- the Division of Cardiovascular and Diabetes Research, Faculty of Medicine and Health, University of Leeds, Leeds LS2 9JT, United Kingdom and
| | - Mark Harris
- From the School of Molecular and Cellular Biology, Faculty of Biological Sciences and
| |
Collapse
|
39
|
Boycott HE, Dallas ML, Elies J, Pettinger L, Boyle JP, Scragg JL, Gamper N, Peers C. Carbon monoxide inhibition of Cav3.2 T-type Ca2+ channels reveals tonic modulation by thioredoxin. FASEB J 2013; 27:3395-407. [PMID: 23671274 DOI: 10.1096/fj.13-227249] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
T-type Ca(2+) channels play diverse roles in tissues such as sensory neurons, vascular smooth muscle, and cancers, where increased expression of the cytoprotective enzyme, heme oxygenase-1 (HO-1) is often found. Here, we report regulation of T-type Ca(2+) channels by carbon monoxide (CO) a HO-1 by-product. CO (applied as CORM-2) caused a concentration-dependent, poorly reversible inhibition of all T-type channel isoforms (Cav3.1-3.3, IC50 ∼3 μM) expressed in HEK293 cells, and native T-type channels in NG108-15 cells and primary rat sensory neurons. No recognized CO-sensitive signaling pathway could account for the CO inhibition of Cav3.2. Instead, CO sensitivity was mediated by an extracellular redox-sensitive site, which was also highly sensitive to thioredoxin (Trx). Trx depletion (using auranofin, 2-5 μM) reduced Cav3.2 currents and their CO sensitivity by >50% but increased sensitivity to dithiothreitol ∼3-fold. By contrast, Cav3.1 and Cav3.3 channels, and their sensitivity to CO, were unaffected in identical experiments. Our data propose a novel signaling pathway in which Trx acts as a tonic, endogenous regulator of Cav3.2 channels, while HO-1-derived CO disrupts this regulation, causing channel inhibition. CO modulation of T-type channels has widespread implications for diverse physiological and pathophysiological mechanisms, such as excitability, contractility, and proliferation.
Collapse
Affiliation(s)
- Hannah E Boycott
- Leeds Institute of Genetics, Health, and Therapeutics, Faculty of Medicine and Health, University of Leeds, Leeds, UK
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Affiliation(s)
- Chris Peers
- Faculty of Medicine and Health, University of Leeds Clarendon Way, Leeds, UK
| |
Collapse
|
41
|
Kumar P, Peers C. Foreword. Respir Physiol Neurobiol 2012; 184:115-6. [DOI: 10.1016/j.resp.2012.07.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 07/23/2012] [Indexed: 10/28/2022]
|
42
|
Dallas ML, Yang Z, Boyle JP, Boycott HE, Scragg JL, Milligan CJ, Elies J, Duke A, Thireau J, Reboul C, Richard S, Bernus O, Steele DS, Peers C. Carbon monoxide induces cardiac arrhythmia via induction of the late Na+ current. Am J Respir Crit Care Med 2012; 186:648-56. [PMID: 22822026 PMCID: PMC3622900 DOI: 10.1164/rccm.201204-0688oc] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 07/10/2012] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Clinical reports describe life-threatening cardiac arrhythmias after environmental exposure to carbon monoxide (CO) or accidental CO poisoning. Numerous case studies describe disruption of repolarization and prolongation of the QT interval, yet the mechanisms underlying CO-induced arrhythmias are unknown. OBJECTIVES To understand the cellular basis of CO-induced arrhythmias and to identify an effective therapeutic approach. METHODS Patch-clamp electrophysiology and confocal Ca(2+) and nitric oxide (NO) imaging in isolated ventricular myocytes was performed together with protein S-nitrosylation to investigate the effects of CO at the cellular and molecular levels, whereas telemetry was used to investigate effects of CO on electrocardiogram recordings in vivo. MEASUREMENTS AND MAIN RESULTS CO increased the sustained (late) component of the inward Na(+) current, resulting in prolongation of the action potential and the associated intracellular Ca(2+) transient. In more than 50% of myocytes these changes progressed to early after-depolarization-like arrhythmias. CO elevated NO levels in myocytes and caused S-nitrosylation of the Na(+) channel, Na(v)1.5. All proarrhythmic effects of CO were abolished by the NO synthase inhibitor l-NAME, and reversed by ranolazine, an inhibitor of the late Na(+) current. Ranolazine also corrected QT variability and arrhythmias induced by CO in vivo, as monitored by telemetry. CONCLUSIONS Our data indicate that the proarrhythmic effects of CO arise from activation of NO synthase, leading to NO-mediated nitrosylation of Na(V)1.5 and to induction of the late Na(+) current. We also show that the antianginal drug ranolazine can abolish CO-induced early after-depolarizations, highlighting a novel approach to the treatment of CO-induced arrhythmias.
Collapse
Affiliation(s)
- Mark L. Dallas
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| | - Zhaokang Yang
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - John P. Boyle
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| | - Hannah E. Boycott
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| | - Jason L. Scragg
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| | - Carol J. Milligan
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Jacobo Elies
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| | - Adrian Duke
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Jérôme Thireau
- Inserm U1046, Physiologie et Médecine Expérimentale du Coeur et des Muscles, CHU Arnaud de Villeneuve, Montpellier, France; and
| | - Cyril Reboul
- Laboratoire de Pharm-écologie Cardiovasculaire, Faculté des Sciences, Avignon, France
| | - Sylvain Richard
- Inserm U1046, Physiologie et Médecine Expérimentale du Coeur et des Muscles, CHU Arnaud de Villeneuve, Montpellier, France; and
| | - Olivier Bernus
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Derek S. Steele
- Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Chris Peers
- Division of Cardiovascular Medicine, Faculty of Medicine and Health, and
| |
Collapse
|
43
|
Hettiarachchi NT, Boyle JP, Bauer CC, Dallas ML, Pearson HA, Hara S, Gamper N, Peers C. Peroxynitrite mediates disruption of Ca2+ homeostasis by carbon monoxide via Ca2+ ATPase degradation. Antioxid Redox Signal 2012; 17:744-55. [PMID: 22360385 DOI: 10.1089/ars.2011.4398] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
AIM Sublethal carbon monoxide poisoning causes prolonged neurological damage involving oxidative stress. Given the central role of Ca(2+) homeostasis and its vulnerability to stress, we investigated whether CO disrupts neuronal Ca(2+) homeostasis. RESULTS Cytosolic Ca(2+) transients evoked by muscarine in SH-SY5Y cells were prolonged by CO (applied via the donor CORM-2), and capacitative Ca(2+) entry (CCE) was dramatically enhanced. Ca(2+) store mobilization by cyclopiazonic acid was similarly augmented, as was the subsequent CCE, and that evoked by thapsigargin. Ca(2+) rises evoked by depolarization were also enhanced by CO, and Ca(2+) levels often did not recover in its presence. CO increased intracellular nitric oxide (NO) and all effects of CO were prevented by inhibiting NO formation. However, NO donors did not mimic the effects of CO. The antioxidant ascorbic acid inhibited effects of CO on Ca(2+) signaling, as did the peroxynitrite scavenger, FeTPPS, and CO increased peroxynitrite formation. Finally, CO caused significant loss of plasma membrane Ca(2+)ATPase (PMCA) protein, detected by Western blot, and this was also observed in brain tissue of rats exposed to CO in vivo. INNOVATION The cellular basis of CO-induced neurotoxicity is currently unknown. Our findings provide the first data to suggest signaling pathways through which CO causes neurological damage, thereby opening up potential targets for therapeutic intervention. CONCLUSION CO stimulates formation of NO and reactive oxygen species which, via peroxynitrite formation, inhibit Ca(2+) extrusion via PMCA, leading to disruption of Ca(2+) signaling. We propose this contributes to the neurological damage associated with CO toxicity.
Collapse
Affiliation(s)
- Nishani T Hettiarachchi
- Leeds Institute of Genetics, Health & Therapeutics, Faculties of Medicine and Health, University of Leeds, United Kingdom
| | | | | | | | | | | | | | | |
Collapse
|
44
|
Abstract
SIGNIFICANCE Evidence of the ability of the gasotransmitter hydrogen sulfide (H(2)S) to serve as a regulator of many physiological functions, including control of blood pressure, regulation of cardiac function, protection of neurons, and cardiomyocytes against apoptosis, and in pain sensation is accumulating. However, the mechanisms accounting for its many actions are not yet well understood. RECENT ADVANCES Following the pioneering studies of the regulation of N-methyl-d-aspartate receptors and ATP-sensitive K(+) channels by H(2)S, data continue to emerge indicating that H(2)S modulates other ion channel types. This article reviews the numerous, yet diverse, types of ion channels now reported to be regulated by H(2)S. CRITICAL ISSUES Currently, a critical issue within this field is to determine the mechanisms by which H(2)S regulates ion channels, as well as other target proteins. Mechanisms to account for regulation include direct channel protein sulfhydration, channel redox modulation, effects mediated by interactions with other gasotransmitters (carbon monoxide and nitric oxide), and indirect effects, such as modulation of channel-regulating kinases. Through such modulation of ion channels, novel roles for H(2)S are emerging as important factors in both physiological and pathological processes. FUTURE DIRECTIONS Increasing current awareness and understanding of the roles and mechanisms of action of ion channel regulation by H(2)S will open opportunities for therapeutic intervention with clear clinical benefits, and inform future therapies. In addition, more sensitive methods for detecting relevant physiological concentrations of H(2)S will allow for clarification of specific ion channel regulation with reference to physiological or pathophysiological settings.
Collapse
Affiliation(s)
- Chris Peers
- Division of Cardiovascular and Neuronal Remodelling, Faculty of Medicine and Health, Leeds Institute for Genetics Health and Therapeutics, University of Leeds, Leeds, United Kingdom.
| | | | | | | | | |
Collapse
|
45
|
Al-Owais MMA, Scragg JL, Dallas ML, Boycott HE, Warburton P, Chakrabarty A, Boyle JP, Peers C. Carbon monoxide mediates the anti-apoptotic effects of heme oxygenase-1 in medulloblastoma DAOY cells via K+ channel inhibition. J Biol Chem 2012; 287:24754-64. [PMID: 22593583 DOI: 10.1074/jbc.m112.357012] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tumor cell survival and proliferation is attributable in part to suppression of apoptotic pathways, yet the mechanisms by which cancer cells resist apoptosis are not fully understood. Many cancer cells constitutively express heme oxygenase-1 (HO-1), which catabolizes heme to generate biliverdin, Fe(2+), and carbon monoxide (CO). These breakdown products may play a role in the ability of cancer cells to suppress apoptotic signals. K(+) channels also play a crucial role in apoptosis, permitting K(+) efflux which is required to initiate caspase activation. Here, we demonstrate that HO-1 is constitutively expressed in human medulloblastoma tissue, and can be induced in the medulloblastoma cell line DAOY either chemically or by hypoxia. Induction of HO-1 markedly increases the resistance of DAOY cells to oxidant-induced apoptosis. This effect was mimicked by exogenous application of the heme degradation product CO. Furthermore we demonstrate the presence of the pro-apoptotic K(+) channel, Kv2.1, in both human medulloblastoma tissue and DAOY cells. CO inhibited the voltage-gated K(+) currents in DAOY cells, and largely reversed the oxidant-induced increase in K(+) channel activity. p38 MAPK inhibition prevented the oxidant-induced increase of K(+) channel activity in DAOY cells, and enhanced their resistance to apoptosis. Our findings suggest that CO-mediated inhibition of K(+) channels represents an important mechanism by which HO-1 can increase the resistance to apoptosis of medulloblastoma cells, and support the idea that HO-1 inhibition may enhance the effectiveness of current chemo- and radiotherapies.
Collapse
Affiliation(s)
- Moza M A Al-Owais
- Division of Cardiovascular and Neuronal Remodelling, LIGHT, Faculty of Medicine and Health, University of Leeds LS2 9JT, United Kingdom
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Evans AM, Hardie DG, Peers C, Kumar P, Wyatt CN. Ion channel regulation by the Lkb1‐AMPK signalling pathway: the key to carotid body activation by hypoxia and metabolic homeostasis at the whole body level. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.897.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- A. Mark Evans
- Centre for Integrative PhysiologyUniversity of EdinburghEdinburghUnited Kingdom
| | | | - Chris Peers
- Division of Cardiovascular and Neuronal RemodellingUniversity of LeedsLeedsUnited Kingdom
| | - Prem Kumar
- School of Clinical and Experimental MedicineUniversity of BirminghamBirminghamUnited Kingdom
| | - Christopher N. Wyatt
- Department of Neuroscience, Cell Biology and PhysiologyWright State UniversityDaytonOH
| |
Collapse
|
47
|
Boyle JP, Hettiarachchi NT, Wilkinson JA, Pearson HA, Scragg JL, Lendon C, Al-Owais MM, Kim CB, Myers DM, Warburton P, Peers C. Cellular consequences of the expression of Alzheimer's disease-causing presenilin 1 mutations in human neuroblastoma (SH-SY5Y) cells. Brain Res 2012; 1443:75-88. [DOI: 10.1016/j.brainres.2011.12.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 10/28/2011] [Accepted: 12/31/2011] [Indexed: 11/27/2022]
|
48
|
Peers C, Steele DS. Carbon monoxide: a vital signalling molecule and potent toxin in the myocardium. J Mol Cell Cardiol 2012; 52:359-65. [PMID: 21640728 DOI: 10.1016/j.yjmcc.2011.05.013] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 05/11/2011] [Accepted: 05/17/2011] [Indexed: 11/20/2022]
Abstract
Endogenous carbon monoxide (CO) is generated through the heme oxygenase-catalysed degradation of heme and is now established as an important, biologically active molecule capable of modulating a number of signalling pathways. Such pathways include those involving nitric oxide/guanylate cyclase, reactive oxygen species (ROS) and MAP kinases. In the heart, up-regulation of the inducible form of heme oxygenase (HO-1) following stresses such as ischemia/reperfusion provides cardioprotection, and much evidence indicates that CO accounts for many of these beneficial effects. One target of CO appears to be the L-type Ca(2+) channel; CO inhibits recombinant and native forms of this cardiac channel via mitochondria-derived ROS, which likely contributes to the protective effects of CO. In stark contrast, exposure to exogenous CO is toxic: chronic, low-level exposure can lead to myocardial injury and fibrosis, whereas acute exposure is associated with life-threatening arrhythmias. The molecular mechanisms accounting for such effects remain to be elucidated, but require future study before the potentially beneficial effects of CO therapy can be safely exploited. This article is part of a Special Issue entitled "Local Signaling in Myocytes".
Collapse
Affiliation(s)
- Chris Peers
- Faculties of Medicine and Biological Sciences, University of Leeds, Leeds LS2 9JT, UK.
| | | |
Collapse
|
49
|
Peers C. Concluding remarks. Adv Exp Med Biol 2012; 758:397-401. [PMID: 23346557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
|
50
|
Evans AM, Peers C, Wyatt CN, Kumar P, Hardie DG. Ion channel regulation by the LKB1-AMPK signalling pathway: the key to carotid body activation by hypoxia and metabolic homeostasis at the whole body level. Adv Exp Med Biol 2012; 758:81-90. [PMID: 23080146 DOI: 10.1007/978-94-007-4584-1_11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Our recent investigations provide further support for the proposal that, consequent to inhibition of mitochondrial oxidative phosphorylation, activation of AMP-activated protein kinase (AMPK) mediates carotid body excitation by hypoxia. Consistent with the effects of hypoxia, intracellular dialysis from a patch pipette of an active (thiophosphorylated) recombinant AMPK heterotrimer (α2β2γ1) or application of the AMPK activators AICAR and A769662: (1) Inhibited BK(Ca) currents and TASK K(+) currents in rat carotid body type I cells; (2) Inhibited whole-cell currents carried by KCa1.1 and TASK3, but not TASK1 channels expressed in HEK293 cells; (3) Triggered carotid body activation. Furthermore, preliminary studies using mice with conditional knockout in type I cells of the primary upstream kinase that activates AMPK in response to metabolic stresses, LKB1, appear to confirm our working hypothesis. Studies on mice with knockout of the catalytic α1 subunit and α2 subunits of AMPK, respectively, have proved equally consistent. Accumulating evidence therefore suggests that the LKB1-AMPK signalling pathway is necessary for hypoxia-response coupling by the carotid body, and serves to regulate oxygen and therefore energy supply at the whole body level.
Collapse
Affiliation(s)
- A Mark Evans
- College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK.
| | | | | | | | | |
Collapse
|