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Behringer EJ. Impact of aging on vascular ion channels: perspectives and knowledge gaps across major organ systems. Am J Physiol Heart Circ Physiol 2023; 325:H1012-H1038. [PMID: 37624095 PMCID: PMC10908410 DOI: 10.1152/ajpheart.00288.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/21/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
Individuals aged ≥65 yr will comprise ∼20% of the global population by 2030. Cardiovascular disease remains the leading cause of death in the world with age-related endothelial "dysfunction" as a key risk factor. As an organ in and of itself, vascular endothelium courses throughout the mammalian body to coordinate blood flow to all other organs and tissues (e.g., brain, heart, lung, skeletal muscle, gut, kidney, skin) in accord with metabolic demand. In turn, emerging evidence demonstrates that vascular aging and its comorbidities (e.g., neurodegeneration, diabetes, hypertension, kidney disease, heart failure, and cancer) are "channelopathies" in large part. With an emphasis on distinct functional traits and common arrangements across major organs systems, the present literature review encompasses regulation of vascular ion channels that underlie blood flow control throughout the body. The regulation of myoendothelial coupling and local versus conducted signaling are discussed with new perspectives for aging and the development of chronic diseases. Although equipped with an awareness of knowledge gaps in the vascular aging field, a section has been included to encompass general feasibility, role of biological sex, and additional conceptual and experimental considerations (e.g., cell regression and proliferation, gene profile analyses). The ultimate goal is for the reader to see and understand major points of deterioration in vascular function while gaining the ability to think of potential mechanistic and therapeutic strategies to sustain organ perfusion and whole body health with aging.
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Affiliation(s)
- Erik J Behringer
- Basic Sciences, Loma Linda University, Loma Linda, California, United States
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2
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Garella R, Bernacchioni C, Chellini F, Tani A, Palmieri F, Parigi M, Guasti D, Cassioli E, Castellini G, Ricca V, Bani D, Sassoli C, Donati C, Squecco R. Adiponectin Modulates Smooth Muscle Cell Morpho-Functional Properties in Murine Gastric Fundus via Sphingosine Kinase 2 Activation. Life (Basel) 2023; 13:1812. [PMID: 37763216 PMCID: PMC10532860 DOI: 10.3390/life13091812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/31/2023] [Accepted: 08/15/2023] [Indexed: 09/29/2023] Open
Abstract
Adipokines are peptide hormones produced by the adipose tissue involved in several biological functions. Among adipokines, adiponectin (ADPN) has antidiabetic and anti-inflammatory properties. It can also modulate food intake at central and peripheral levels, acting on hypothalamus and facilitating gastric relaxation. ADPN exerts its action interacting with two distinct membrane receptors and triggering some well-defined signaling cascades. The ceramidase activity of ADPN receptor has been reported in many tissues: it converts ceramide into sphingosine. In turn, sphingosine kinase (SK) phosphorylates it into sphingosine-1 phosphate (S1P), a crucial mediator of many cellular processes including contractility. Using a multidisciplinary approach that combined biochemical, electrophysiological and morphological investigations, we explored for the first time the possible role of S1P metabolism in mediating ADPN effects on the murine gastric fundus muscle layer. By using a specific pharmacological inhibitor of SK2, we showed that ADPN affects smooth muscle cell membrane properties and contractile machinery via SK2 activation in gastric fundus, adding a piece of knowledge to the action mechanisms of this hormone. These findings help to identify ADPN and its receptors as new therapeutic targets or as possible prognostic markers for diseases with altered energy balance and for pathologies with fat mass content alterations.
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Affiliation(s)
- Rachele Garella
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy; (F.P.); (R.S.)
| | - Caterina Bernacchioni
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy;
| | - Flaminia Chellini
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Alessia Tani
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Francesco Palmieri
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy; (F.P.); (R.S.)
| | - Martina Parigi
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Daniele Guasti
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Emanuele Cassioli
- Psychiatry Unit, Department of Health Sciences, University of Florence, 50134 Florence, Italy; (E.C.); (G.C.); (V.R.)
| | - Giovanni Castellini
- Psychiatry Unit, Department of Health Sciences, University of Florence, 50134 Florence, Italy; (E.C.); (G.C.); (V.R.)
| | - Valdo Ricca
- Psychiatry Unit, Department of Health Sciences, University of Florence, 50134 Florence, Italy; (E.C.); (G.C.); (V.R.)
| | - Daniele Bani
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Chiara Sassoli
- Department of Experimental and Clinical Medicine, Section of Anatomy and Histology, Imaging Platform, University of Florence, 50134 Florence, Italy; (F.C.); (A.T.); (M.P.); (D.G.); (D.B.); (C.S.)
| | - Chiara Donati
- Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, 50134 Florence, Italy;
| | - Roberta Squecco
- Department of Experimental and Clinical Medicine, Section of Physiological Sciences, University of Florence, 50134 Florence, Italy; (F.P.); (R.S.)
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Abstract
Resistance arteries and arterioles evolved as specialized blood vessels serving two important functions: (a) regulating peripheral vascular resistance and blood pressure and (b) matching oxygen and nutrient delivery to metabolic demands of organs. These functions require control of vessel lumen cross-sectional area (vascular tone) via coordinated vascular cell responses governed by precise spatial-temporal communication between intracellular signaling pathways. Herein, we provide a contemporary overview of the significant roles that redox switches play in calcium signaling for orchestrated endothelial, smooth muscle, and red blood cell control of arterial vascular tone. Three interrelated themes are the focus: (a) smooth muscle to endothelial communication for vasoconstriction, (b) endothelial to smooth muscle cell cross talk for vasodilation, and (c) oxygen and red blood cell interregulation of vascular tone and blood flow. We intend for this thematic framework to highlight gaps in our current knowledge and potentially spark interest for cross-disciplinary studies moving forward.
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Affiliation(s)
- Máté Katona
- Pittsburgh Heart, Lung, and Blood Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
| | - Mark T Gladwin
- Pittsburgh Heart, Lung, and Blood Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
- Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Current affiliation: University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Adam C Straub
- Pittsburgh Heart, Lung, and Blood Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- Center for Microvascular Research, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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4
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Sharma A, Rahman G, Gorelik J, Bhargava A. Voltage-Gated T-Type Calcium Channel Modulation by Kinases and Phosphatases: The Old Ones, the New Ones, and the Missing Ones. Cells 2023; 12:461. [PMID: 36766802 PMCID: PMC9913649 DOI: 10.3390/cells12030461] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/14/2023] [Accepted: 01/29/2023] [Indexed: 02/04/2023] Open
Abstract
Calcium (Ca2+) can regulate a wide variety of cellular fates, such as proliferation, apoptosis, and autophagy. More importantly, changes in the intracellular Ca2+ level can modulate signaling pathways that control a broad range of physiological as well as pathological cellular events, including those important to cellular excitability, cell cycle, gene-transcription, contraction, cancer progression, etc. Not only intracellular Ca2+ level but the distribution of Ca2+ in the intracellular compartments is also a highly regulated process. For this Ca2+ homeostasis, numerous Ca2+ chelating, storage, and transport mechanisms are required. There are also specialized proteins that are responsible for buffering and transport of Ca2+. T-type Ca2+ channels (TTCCs) are one of those specialized proteins which play a key role in the signal transduction of many excitable and non-excitable cell types. TTCCs are low-voltage activated channels that belong to the family of voltage-gated Ca2+ channels. Over decades, multiple kinases and phosphatases have been shown to modulate the activity of TTCCs, thus playing an indirect role in maintaining cellular physiology. In this review, we provide information on the kinase and phosphatase modulation of TTCC isoforms Cav3.1, Cav3.2, and Cav3.3, which are mostly described for roles unrelated to cellular excitability. We also describe possible potential modulations that are yet to be explored. For example, both mitogen-activated protein kinase and citron kinase show affinity for different TTCC isoforms; however, the effect of such interaction on TTCC current/kinetics has not been studied yet.
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Affiliation(s)
- Ankush Sharma
- Department of Biotechnology, Indian Institute of Technology Hyderabad (IITH), Kandi 502284, Telangana, India
| | - Ghazala Rahman
- Department of Biotechnology, Indian Institute of Technology Hyderabad (IITH), Kandi 502284, Telangana, India
| | - Julia Gorelik
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London W12 0NN, UK
| | - Anamika Bhargava
- Department of Biotechnology, Indian Institute of Technology Hyderabad (IITH), Kandi 502284, Telangana, India
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5
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Ottolini M, Sonkusare SK. The Calcium Signaling Mechanisms in Arterial Smooth Muscle and Endothelial Cells. Compr Physiol 2021; 11:1831-1869. [PMID: 33792900 PMCID: PMC10388069 DOI: 10.1002/cphy.c200030] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The contractile state of resistance arteries and arterioles is a crucial determinant of blood pressure and blood flow. Physiological regulation of arterial contractility requires constant communication between endothelial and smooth muscle cells. Various Ca2+ signals and Ca2+ -sensitive targets ensure dynamic control of intercellular communications in the vascular wall. The functional effect of a Ca2+ signal on arterial contractility depends on the type of Ca2+ -sensitive target engaged by that signal. Recent studies using advanced imaging methods have identified the spatiotemporal signatures of individual Ca2+ signals that control arterial and arteriolar contractility. Broadly speaking, intracellular Ca2+ is increased by ion channels and transporters on the plasma membrane and endoplasmic reticular membrane. Physiological roles for many vascular Ca2+ signals have already been confirmed, while further investigation is needed for other Ca2+ signals. This article focuses on endothelial and smooth muscle Ca2+ signaling mechanisms in resistance arteries and arterioles. We discuss the Ca2+ entry pathways at the plasma membrane, Ca2+ release signals from the intracellular stores, the functional and physiological relevance of Ca2+ signals, and their regulatory mechanisms. Finally, we describe the contribution of abnormal endothelial and smooth muscle Ca2+ signals to the pathogenesis of vascular disorders. © 2021 American Physiological Society. Compr Physiol 11:1831-1869, 2021.
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Affiliation(s)
- Matteo Ottolini
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia, USA
| | - Swapnil K Sonkusare
- Department of Pharmacology, University of Virginia, Charlottesville, Virginia, USA.,Department of Molecular Physiology & Biological Physics, University of Virginia, Charlottesville, Virginia, USA.,Robert M. Berne Cardiovascular Research Center, University of Virginia, Charlottesville, Virginia, USA
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Smith JF, Lemmey HA, Borysova L, Hiley CR, Dora KA, Garland CJ. Endothelial Nitric Oxide Suppresses Action-Potential-Like Transient Spikes and Vasospasm in Small Resistance Arteries. Hypertension 2020; 76:785-794. [PMID: 32713276 PMCID: PMC7418934 DOI: 10.1161/hypertensionaha.120.15491] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 05/27/2020] [Accepted: 07/01/2020] [Indexed: 11/16/2022]
Abstract
Endothelial dysfunction in small arteries is a ubiquitous, early feature of cardiovascular disease, including hypertension. Dysfunction reflects reduced bioavailability of endothelium-derived nitric oxide (NO) and depressed endothelium-dependent hyperpolarization that enhances vasoreactivity. We measured smooth muscle membrane potential and tension, smooth muscle calcium, and used real-time quantitative polymerase chain reaction in small arteries and isolated tubes of endothelium to investigate how dysfunction enhances vasoreactivity. Rat nonmyogenic mesenteric resistance arteries developed vasomotion to micromolar phenylephrine (α1-adrenoceptor agonist); symmetrical vasoconstrictor oscillations mediated by L-type voltage-gated Ca2+ channels (VGCCs). Inhibiting NO synthesis abolished vasomotion so nanomolar phenylephrine now stimulated rapid, transient depolarizing spikes in the smooth muscle associated with chaotic vasomotion/vasospasm. Endothelium-dependent hyperpolarization block also enabled phenylephrine-vasospasm but without spikes or chaotic vasomotion. Depolarizing spikes were Ca2+-based and abolished by either T-type or L-type VGCCs blockers with depressed vasoconstriction. Removing NO also enabled transient spikes/vasoconstriction to Bay K-8644 (L-type VGCC activator). However, these were abolished by the L-type VGCC blocker nifedipine but not T-type VGCC block. Phenylephrine also initiated T-type VGCC-transient spikes and enhanced vasoconstriction after NO loss in nonmyogenic arteries from spontaneously hypertensive rats. In contrast to mesenteric arteries, myogenic coronary arteries displayed transient spikes and further vasoconstriction spontaneously on loss of NO. T-type VGCC block abolished these spikes and additional vasoconstriction but not myogenic tone. Therefore, in myogenic and nonmyogenic small arteries, reduced NO bioavailability engages T-type VGCCs, triggering transient depolarizing spikes in normally quiescent vascular smooth muscle to cause vasospasm. T-type block may offer a means to suppress vasospasm without inhibiting myogenic tone mediated by L-type VGCCs.
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Affiliation(s)
- Josh F. Smith
- Department of Pharmacology, Universityxs of Oxford (J.F.S., H.A.L.L., L.B, K.A.D., C.J.G.)
| | - Hamish A.L. Lemmey
- Department of Pharmacology, Universityxs of Oxford (J.F.S., H.A.L.L., L.B, K.A.D., C.J.G.)
| | - Lyudmyla Borysova
- Department of Pharmacology, Universityxs of Oxford (J.F.S., H.A.L.L., L.B, K.A.D., C.J.G.)
| | - C. Robin Hiley
- From the Deptartment of Pharmacology, University of Cambridge (C.R.H.)
| | - Kim A. Dora
- Department of Pharmacology, Universityxs of Oxford (J.F.S., H.A.L.L., L.B, K.A.D., C.J.G.)
| | - Christopher J. Garland
- Department of Pharmacology, Universityxs of Oxford (J.F.S., H.A.L.L., L.B, K.A.D., C.J.G.)
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7
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Manoury B, Idres S, Leblais V, Fischmeister R. Ion channels as effectors of cyclic nucleotide pathways: Functional relevance for arterial tone regulation. Pharmacol Ther 2020; 209:107499. [PMID: 32068004 DOI: 10.1016/j.pharmthera.2020.107499] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Accepted: 02/05/2020] [Indexed: 02/07/2023]
Abstract
Numerous mediators and drugs regulate blood flow or arterial pressure by acting on vascular tone, involving cyclic nucleotide intracellular pathways. These signals lead to regulation of several cellular effectors, including ion channels that tune cell membrane potential, Ca2+ influx and vascular tone. The characterization of these vasocontrictive or vasodilating mechanisms has grown in complexity due to i) the variety of ion channels that are expressed in both vascular endothelial and smooth muscle cells, ii) the heterogeneity of responses among the various vascular beds, and iii) the number of molecular mechanisms involved in cyclic nucleotide signalling in health and disease. This review synthesizes key data from literature that highlight ion channels as physiologically relevant effectors of cyclic nucleotide pathways in the vasculature, including the characterization of the molecular mechanisms involved. In smooth muscle cells, cation influx or chloride efflux through ion channels are associated with vasoconstriction, whereas K+ efflux repolarizes the cell membrane potential and mediates vasodilatation. Both categories of ion currents are under the influence of cAMP and cGMP pathways. Evidence that some ion channels are influenced by CN signalling in endothelial cells will also be presented. Emphasis will also be put on recent data touching a variety of determinants such as phosphodiesterases, EPAC and kinase anchoring, that complicate or even challenge former paradigms.
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Affiliation(s)
- Boris Manoury
- Inserm, Umr-S 1180, Université Paris-Saclay, Châtenay-Malabry, France.
| | - Sarah Idres
- Inserm, Umr-S 1180, Université Paris-Saclay, Châtenay-Malabry, France
| | - Véronique Leblais
- Inserm, Umr-S 1180, Université Paris-Saclay, Châtenay-Malabry, France
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8
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To KHT, Gui P, Li M, Zawieja SD, Castorena-Gonzalez JA, Davis MJ. T-type, but not L-type, voltage-gated calcium channels are dispensable for lymphatic pacemaking and spontaneous contractions. Sci Rep 2020; 10:70. [PMID: 31919478 PMCID: PMC6952455 DOI: 10.1038/s41598-019-56953-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 12/10/2019] [Indexed: 12/28/2022] Open
Abstract
The spontaneous contractions of collecting lymphatic vessels provide an essential propulsive force to return lymph centrally. These contractions are driven by an intrinsic electrical pacemaker, working through an unknown underlying ionic mechanism that becomes compromised in some forms of lymphedema. In previous studies, T-type voltage-gated Ca2+ channels (VGCCs) were implicated in this pacemaking mechanism, based on the effects of the reputedly selective T-type VGCC inhibitors mibefradil and Ni2+. Our goal was to test this idea in a more definitive way using genetic knock out mice. First, we demonstrated through both PCR and immunostaining that mouse lymphatic muscle cells expressed Cav3.1 and Cav3.2 and produced functional T-type VGCC currents when patch clamped. We then employed genetic deletion strategies to selectively test the roles of each T-type VGCC isoform in the regulation of lymphatic pacemaking. Surprisingly, global deletion of either, or both, isoform(s) was without significant effect on either the frequency, amplitude, or fractional pump flow of lymphatic collectors from two different regions of the mouse, studied ex vivo. Further, both WT and Cav3.1-/-; 3.2-/- double knock-out lymphatic vessels responded similarly to mibefradil and Ni2+, which substantially reduced contraction amplitudes and slightly increased frequencies at almost all pressures in both strains: a pattern consistent with inhibition of L-type rather than T-type VGCCs. Neither T-type VGCC isoform was required for ACh-induced inhibition of contraction, a mechanism by which those channels in smooth muscle are thought to be targets of endothelium-derived nitric oxide. Sharp intracellular electrode measurements in lymphatic smooth muscle revealed only subtle, but not significant, differences in the resting membrane potential and action potential characteristics between vessels from wild-type and Cav3.1-/-; 3.2-/- double knock-out mice. In contrast, smooth-muscle specific deletion of the L-type VGCC, Cav1.2, completely abolished all lymphatic spontaneous contractions. Collectively our results suggest that, although T-type VGCCs are expressed in mouse lymphatic smooth muscle, they do not play a significant role in modulating the frequency of the ionic pacemaker or the amplitude of spontaneous contractions. We conclude that the effects of mibefradil and Ni2+ in other lymphatic preparations are largely or completely explained by off-target effects on L-type VGCCs, which are essential for controlling both the frequency and strength of spontaneous contractions.
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MESH Headings
- Animals
- Calcium Channel Blockers/pharmacology
- Calcium Channels, L-Type/chemistry
- Calcium Channels, L-Type/genetics
- Calcium Channels, L-Type/metabolism
- Calcium Channels, T-Type/deficiency
- Calcium Channels, T-Type/genetics
- Calcium Channels, T-Type/metabolism
- Lymphatic Vessels/physiology
- Male
- Membrane Potentials/drug effects
- Mibefradil/pharmacology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Muscle Contraction/drug effects
- Muscle Contraction/physiology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/metabolism
- Nickel/pharmacology
- Pacemaker, Artificial
- Rats
- Rats, Wistar
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Affiliation(s)
- Kim H T To
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA
| | - Peichun Gui
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA
| | - Min Li
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA
| | - Scott D Zawieja
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA
| | - Jorge A Castorena-Gonzalez
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA
| | - Michael J Davis
- Department of Medical Pharmacology and Physiology, University of Missouri School of Medicine, Columbia, Missouri, 65212, USA.
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Tarazona S, Bernabeu E, Carmona H, Gómez-Giménez B, García-Planells J, Leonards PEG, Jung S, Conesa A, Felipo V, Llansola M. A Multiomics Study To Unravel the Effects of Developmental Exposure to Endosulfan in Rats: Molecular Explanation for Sex-Dependent Effects. ACS Chem Neurosci 2019; 10:4264-4279. [PMID: 31464424 DOI: 10.1021/acschemneuro.9b00304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Exposure to low levels of environmental contaminants, including pesticides, induces neurodevelopmental toxicity. Environmental and food contaminants can reach the brain of the fetus, affecting brain development and leading to neurological dysfunction. The pesticide endosulfan is a persistent pollutant, and significant levels still remain detectable in the environment although its use is banned in some countries. In rats, endosulfan exposure during brain development alters motor activity, coordination, learning, and memory, even several months after uptake, and does so in a sex-dependent way. However, the molecular mechanisms driving these effects have not been studied in detail. In this work, we performed a multiomics study in cerebellum from rats exposed to endosulfan during embryonic development. Pregnant rats were orally exposed to a low dose (0.5 mg/kg) of endosulfan, daily, from gestational day 7 to postnatal day 21. The progeny was evaluated for cognitive and motor functions at adulthood. Expression of messenger RNA and microRNA genes, as well as protein and metabolite levels, were measured on cerebellar samples from males and females. An integrative analysis was conducted to identify altered processes under endosulfan effect. Effects between males and females were compared. Pathways significantly altered by endosulfan exposure included the phosphatidylinositol signaling system, calcium signaling, the cGMP-PKG pathway, the inflammatory and immune system, protein processing in the endoplasmic reticulum, and GABA and taurine metabolism. Sex-dependent effects of endosulfan in the omics results that matched sex differences in cognitive and motor tests were found. These results shed light on the molecular basis of impaired neurodevelopment and contribute to the identification of new biomarkers of neurotoxicity.
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Affiliation(s)
- Sonia Tarazona
- Department of Genomics of Gene Expression, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
- Department of Applied Statistics, Operations Research and Quality, Universitat Politècnica de València, 46022 Valencia, Spain
| | - Elena Bernabeu
- Department of Genomics of Gene Expression, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
| | - Héctor Carmona
- Department of Genomics of Gene Expression, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
| | - Belén Gómez-Giménez
- Laboratory of Neurobiology, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
| | - Javier García-Planells
- IMEGEN, Instituto de Medicina Genómica, S.L. Parc Científic de la Universitat de València, 46980 Paterna, Spain
| | - Pim E. G. Leonards
- Department of Environment & Health, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands
| | - Stephan Jung
- Proteome Sciences R&D GmbH & Co. KG, 60438 Frankfurt, Germany
| | - Ana Conesa
- Microbiology and Cell Science Department, Institute for Food and Agricultural Sciences, University of Florida, Gainesville, Florida 32603, United States
- Genetics Institute, University of Florida, Gainesville, Florida 32603, United States
| | - Vicente Felipo
- Laboratory of Neurobiology, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
| | - Marta Llansola
- Laboratory of Neurobiology, Centro de Investigación Príncipe Felipe, 46012 Valencia, Spain
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10
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Ottolini M, Hong K, Sonkusare SK. Calcium signals that determine vascular resistance. WILEY INTERDISCIPLINARY REVIEWS. SYSTEMS BIOLOGY AND MEDICINE 2019; 11:e1448. [PMID: 30884210 PMCID: PMC6688910 DOI: 10.1002/wsbm.1448] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 02/07/2019] [Accepted: 02/14/2019] [Indexed: 12/19/2022]
Abstract
Small arteries in the body control vascular resistance, and therefore, blood pressure and blood flow. Endothelial and smooth muscle cells in the arterial walls respond to various stimuli by altering the vascular resistance on a moment to moment basis. Smooth muscle cells can directly influence arterial diameter by contracting or relaxing, whereas endothelial cells that line the inner walls of the arteries modulate the contractile state of surrounding smooth muscle cells. Cytosolic calcium is a key driver of endothelial and smooth muscle cell functions. Cytosolic calcium can be increased either by calcium release from intracellular stores through IP3 or ryanodine receptors, or the influx of extracellular calcium through ion channels at the cell membrane. Depending on the cell type, spatial localization, source of a calcium signal, and the calcium-sensitive target activated, a particular calcium signal can dilate or constrict the arteries. Calcium signals in the vasculature can be classified into several types based on their source, kinetics, and spatial and temporal properties. The calcium signaling mechanisms in smooth muscle and endothelial cells have been extensively studied in the native or freshly isolated cells, therefore, this review is limited to the discussions of studies in native or freshly isolated cells. This article is categorized under: Biological Mechanisms > Cell Signaling Laboratory Methods and Technologies > Imaging Models of Systems Properties and Processes > Mechanistic Models.
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Affiliation(s)
- Matteo Ottolini
- Robert M. Berne Cardiovascular Research Center, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
- Department of Pharmacology, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
| | - Kwangseok Hong
- Robert M. Berne Cardiovascular Research Center, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
- Department of Physical Education, Chung-Ang University, Seoul, 06974, South Korea
| | - Swapnil K. Sonkusare
- Robert M. Berne Cardiovascular Research Center, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
- Department of Pharmacology, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
- Department of Molecular Physiology and Biological Physics, University of Virginia-School of Medicine, Charlottesville, VA, 22908, USA
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11
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Hashad AM, Sancho M, Brett SE, Welsh DG. Reactive Oxygen Species Mediate the Suppression of Arterial Smooth Muscle T-type Ca 2+ Channels by Angiotensin II. Sci Rep 2018; 8:3445. [PMID: 29472601 PMCID: PMC5823855 DOI: 10.1038/s41598-018-21899-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 02/13/2018] [Indexed: 02/07/2023] Open
Abstract
Vascular T-type Ca2+ channels (CaV3.1 and CaV3.2) play a key role in arterial tone development. This study investigated whether this conductance is a regulatory target of angiotensin II (Ang II), a vasoactive peptide that circulates and which is locally produced within the arterial wall. Patch clamp electrophysiology performed on rat cerebral arterial smooth muscle cells reveals that Ang II (100 nM) inhibited T-type currents through AT1 receptor activation. Blocking protein kinase C failed to eliminate channel suppression, a finding consistent with unique signaling proteins enabling this response. In this regard, inhibiting NADPH oxidase (Nox) with apocynin or ML171 (Nox1 selective) abolished channel suppression highlighting a role for reactive oxygen species (ROS). In the presence of Ni2+ (50 µM), Ang II failed to modulate the residual T-type current, an observation consistent with this peptide targeting CaV3.2. Selective channel suppression by Ang II impaired the ability of CaV3.2 to alter spontaneous transient outward currents or vessel diameter. Proximity ligation assay confirmed Nox1 colocalization with CaV3.2. In closing, Ang II targets CaV3.2 channels via a signaling pathway involving Nox1 and the generation of ROS. This unique regulatory mechanism alters BKCa mediated feedback giving rise to a “constrictive” phenotype often observed with cerebrovascular disease.
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Affiliation(s)
- Ahmed M Hashad
- Deptartment of Physiology & Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes, University of Calgary, Alberta, Canada
| | - Maria Sancho
- Deptartment Physiology & Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Suzanne E Brett
- Deptartment Physiology & Pharmacology, University of Western Ontario, London, Ontario, Canada
| | - Donald G Welsh
- Deptartment of Physiology & Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes, University of Calgary, Alberta, Canada. .,Deptartment Physiology & Pharmacology, University of Western Ontario, London, Ontario, Canada.
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12
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Marziano C, Hong K, Cope EL, Kotlikoff MI, Isakson BE, Sonkusare SK. Nitric Oxide-Dependent Feedback Loop Regulates Transient Receptor Potential Vanilloid 4 (TRPV4) Channel Cooperativity and Endothelial Function in Small Pulmonary Arteries. J Am Heart Assoc 2017; 6:JAHA.117.007157. [PMID: 29275372 PMCID: PMC5779028 DOI: 10.1161/jaha.117.007157] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Recent studies demonstrate that spatially restricted, local Ca2+ signals are key regulators of endothelium-dependent vasodilation in systemic circulation. There are drastic functional differences between pulmonary arteries (PAs) and systemic arteries, but the local Ca2+ signals that control endothelium-dependent vasodilation of PAs are not known. Localized, unitary Ca2+ influx events through transient receptor potential vanilloid 4 (TRPV4) channels, termed TRPV4 sparklets, regulate endothelium-dependent vasodilation in resistance-sized mesenteric arteries via activation of Ca2+-dependent K+ channels. The objective of this study was to determine the unique functional roles, signaling targets, and endogenous regulators of TRPV4 sparklets in resistance-sized PAs. METHODS AND RESULTS Using confocal imaging, custom image analysis, and pressure myography in fourth-order PAs in conjunction with knockout mouse models, we report a novel Ca2+ signaling mechanism that regulates endothelium-dependent vasodilation in resistance-sized PAs. TRPV4 sparklets exhibit distinct spatial localization in PAs when compared with mesenteric arteries, and preferentially activate endothelial nitric oxide synthase (eNOS). Nitric oxide released by TRPV4-endothelial nitric oxide synthase signaling not only promotes vasodilation, but also initiates a guanylyl cyclase-protein kinase G-dependent negative feedback loop that inhibits cooperative openings of TRPV4 channels, thus limiting sparklet activity. Moreover, we discovered that adenosine triphosphate dilates PAs through a P2 purinergic receptor-dependent activation of TRPV4 sparklets. CONCLUSIONS Our results reveal a spatially distinct TRPV4-endothelial nitric oxide synthase signaling mechanism and its novel endogenous regulators in resistance-sized PAs.
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Affiliation(s)
- Corina Marziano
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA.,Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA
| | - Kwangseok Hong
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA
| | - Eric L Cope
- Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA
| | - Michael I Kotlikoff
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
| | - Brant E Isakson
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA.,Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA
| | - Swapnil K Sonkusare
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA .,Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA.,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA
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13
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Sankhe S, Manousakidi S, Antigny F, Arthur Ataam J, Bentebbal S, Ruchon Y, Lecerf F, Sabourin J, Price L, Fadel E, Dorfmüller P, Eddahibi S, Humbert M, Perros F, Capuano V. T-type Ca 2+ channels elicit pro-proliferative and anti-apoptotic responses through impaired PP2A/Akt1 signaling in PASMCs from patients with pulmonary arterial hypertension. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:1631-1641. [PMID: 28655554 DOI: 10.1016/j.bbamcr.2017.06.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 06/13/2017] [Accepted: 06/21/2017] [Indexed: 10/19/2022]
Abstract
Idiopathic pulmonary arterial hypertension (iPAH) is characterized by obstructive hyperproliferation and apoptosis resistance of distal pulmonary artery smooth muscle cells (PASMCs). T-type Ca2+ channel blockers have been shown to reduce experimental pulmonary hypertension, although the impact of T-type channel inhibition remains unexplored in PASMCs from iPAH patients. Here we show that T-type channels Cav3.1 and Cav3.2 are present in the lung and PASMCs from iPAH patients and control subjects. The blockade of T-type channels by the specific blocker, TTA-A2, prevents cell cycle progression and PASMCs growth. In iPAH cells, T-type channel signaling fails to activate phosphatase PP2A, leading to an increase in ERK1/2, P38 activation. Moreover, T-type channel signaling is redirected towards the activation of the kinase Akt1, leading to increased expression of the anti-apoptotic protein survivin, and a decrease in the pro-apoptotic mediator FoxO3A. Finally, in iPAH cells, Akt1 is no longer able to regulate caspase 9 activation, whereas T-type channel overexpression reverses PP2A defect in iPAH cells but reinforces the deleterious effects of Akt1 activation. Altogether, these data highlight T-type channel signaling as a strong trigger of the pathological phenotype of PASMCs from iPAH patients (hyper-proliferation/cells survival and apoptosis resistance), suggesting that both T-type channels and PP2A may be promising therapeutic targets for pulmonary hypertension.
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Affiliation(s)
- Safietou Sankhe
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Sevasti Manousakidi
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Fabrice Antigny
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Jennifer Arthur Ataam
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Sana Bentebbal
- PhyMedExp, Univ. Montpellier, Inserm U1046, cNRS UMR9214.34295 MINSERM U1046, Montpellier, France
| | - Yann Ruchon
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Florence Lecerf
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Jessica Sabourin
- INSERM UMR-S1180, Univ. Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France
| | - Laura Price
- National Pulmonary Hypertension Service, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
| | - Elie Fadel
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Peter Dorfmüller
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Saadia Eddahibi
- PhyMedExp, Univ. Montpellier, Inserm U1046, cNRS UMR9214.34295 MINSERM U1046, Montpellier, France
| | - Marc Humbert
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France; AP-HP, Service de pneumologie, Hôpital Bicêtre, Le Kremlin Bicêtre, France
| | - Frédéric Perros
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France
| | - Véronique Capuano
- INSERM U999, Hôpital Marie Lannelongue, Le Plessis Robinson, France; Univ. Paris-Sud, Faculté de Médecine, Univ. Paris-Saclay, Le Kremlin Bicêtre, France.
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14
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Abstract
SIGNIFICANCE The family of gasotransmitter molecules, nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S), has emerged as an important mediator of numerous cellular signal transduction and pathophysiological responses. As such, these molecules have been reported to influence a diverse array of biochemical, molecular, and cell biology events often impacting one another. Recent Advances: Discrete regulation of gasotransmitter molecule formation, movement, and reaction is critical to their biological function. Due to the chemical nature of these molecules, they can move rapidly throughout cells and tissues acting on targets through reactions with metal groups, reactive chemical species, and protein amino acids. CRITICAL ISSUES Given the breadth and complexity of gasotransmitter reactions, this field of research is expanding into exciting, yet sometimes confusing, areas of study with significant promise for understanding health and disease. The precise amounts of tissue and cellular gasotransmitter levels and where they are formed, as well as how they react with molecular targets or themselves, all remain poorly understood. FUTURE DIRECTIONS Elucidation of specific molecular targets, characteristics of gasotransmitter molecule heterotypic interactions, and spatiotemporal formation and metabolism are all important to better understand their true pathophysiological importance in various organ systems. Antioxid. Redox Signal. 26, 936-960.
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Affiliation(s)
- Gopi K Kolluru
- 1 Department of Pathology, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana
| | - Xinggui Shen
- 1 Department of Pathology, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana
| | - Shuai Yuan
- 2 Department of Cellular Biology and Anatomy, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana
| | - Christopher G Kevil
- 1 Department of Pathology, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana.,2 Department of Cellular Biology and Anatomy, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana.,3 Department of Molecular and Cellular Physiology, LSU Health Sciences Center-Shreveport , Shreveport, Louisiana
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15
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Sandoval A, Duran P, Gandini MA, Andrade A, Almanza A, Kaja S, Felix R. Regulation of L-type Ca V1.3 channel activity and insulin secretion by the cGMP-PKG signaling pathway. Cell Calcium 2017; 66:1-9. [PMID: 28807144 DOI: 10.1016/j.ceca.2017.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 04/03/2017] [Accepted: 05/12/2017] [Indexed: 12/28/2022]
Abstract
cGMP is a second messenger widely used in the nervous system and other tissues. One of the major effectors for cGMP is the serine/threonine protein kinase, cGMP-dependent protein kinase (PKG), which catalyzes the phosphorylation of a variety of proteins including ion channels. Previously, it has been shown that the cGMP-PKG signaling pathway inhibits Ca2+ currents in rat vestibular hair cells and chromaffin cells. This current allegedly flow through voltage-gated CaV1.3L-type Ca2+ channels, and is important for controlling vestibular hair cell sensory function and catecholamine secretion, respectively. Here, we show that native L-type channels in the insulin-secreting RIN-m5F cell line, and recombinant CaV1.3 channels heterologously expressed in HEK-293 cells, are regulatory targets of the cGMP-PKG signaling cascade. Our results indicate that the CaVα1 ion-conducting subunit of the CaV1.3 channels is highly expressed in RIN-m5F cells and that the application of 8-Br-cGMP, a membrane-permeable analogue of cGMP, significantly inhibits Ca2+ macroscopic currents and impair insulin release stimulated with high K+. In addition, KT-5823, a specific inhibitor of PKG, prevents the current inhibition generated by 8-Br-cGMP in the heterologous expression system. Interestingly, mutating the putative phosphorylation sites to residues resistant to phosphorylation showed that the relevant PKG sites for CaV1.3 L-type channel regulation centers on two amino acid residues, Ser793 and Ser860, located in the intracellular loop connecting the II and III repeats of the CaVα1 pore-forming subunit of the channel. These findings unveil a novel mechanism for how the cGMP-PKG signaling pathway may regulate CaV1.3 channels and contribute to regulate insulin secretion.
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Affiliation(s)
| | - Paz Duran
- Departamento de Biología Celular, Cinvestav-IPN, Ciudad de México, Mexico
| | - María A Gandini
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Arturo Andrade
- Department of Biological Sciences, University of New Hampshire, Durham, NH, USA
| | - Angélica Almanza
- Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría, Ramón de la Fuente Muñiz, Ciudad de México, Mexico
| | - Simon Kaja
- Department of Ophtalmology and Molecular Pharmacology & Therapeutics, Loyola University, Chicago, Strich School of Medicine, Maywood, IL, USA
| | - Ricardo Felix
- Departamento de Biología Celular, Cinvestav-IPN, Ciudad de México, Mexico.
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16
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Tykocki NR, Boerman EM, Jackson WF. Smooth Muscle Ion Channels and Regulation of Vascular Tone in Resistance Arteries and Arterioles. Compr Physiol 2017; 7:485-581. [PMID: 28333380 DOI: 10.1002/cphy.c160011] [Citation(s) in RCA: 222] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Vascular tone of resistance arteries and arterioles determines peripheral vascular resistance, contributing to the regulation of blood pressure and blood flow to, and within the body's tissues and organs. Ion channels in the plasma membrane and endoplasmic reticulum of vascular smooth muscle cells (SMCs) in these blood vessels importantly contribute to the regulation of intracellular Ca2+ concentration, the primary determinant of SMC contractile activity and vascular tone. Ion channels provide the main source of activator Ca2+ that determines vascular tone, and strongly contribute to setting and regulating membrane potential, which, in turn, regulates the open-state-probability of voltage gated Ca2+ channels (VGCCs), the primary source of Ca2+ in resistance artery and arteriolar SMCs. Ion channel function is also modulated by vasoconstrictors and vasodilators, contributing to all aspects of the regulation of vascular tone. This review will focus on the physiology of VGCCs, voltage-gated K+ (KV) channels, large-conductance Ca2+-activated K+ (BKCa) channels, strong-inward-rectifier K+ (KIR) channels, ATP-sensitive K+ (KATP) channels, ryanodine receptors (RyRs), inositol 1,4,5-trisphosphate receptors (IP3Rs), and a variety of transient receptor potential (TRP) channels that contribute to pressure-induced myogenic tone in resistance arteries and arterioles, the modulation of the function of these ion channels by vasoconstrictors and vasodilators, their role in the functional regulation of tissue blood flow and their dysfunction in diseases such as hypertension, obesity, and diabetes. © 2017 American Physiological Society. Compr Physiol 7:485-581, 2017.
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Affiliation(s)
- Nathan R Tykocki
- Department of Pharmacology, University of Vermont, Burlington, Vermont, USA
| | - Erika M Boerman
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri, USA
| | - William F Jackson
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan, USA
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17
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Mikkelsen MF, Björling K, Jensen LJ. Age-dependent impact of Ca V 3.2 T-type calcium channel deletion on myogenic tone and flow-mediated vasodilatation in small arteries. J Physiol 2016; 594:5881-5898. [PMID: 26752249 PMCID: PMC5063926 DOI: 10.1113/jp271470] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 12/18/2015] [Indexed: 01/14/2023] Open
Abstract
KEY POINTS Blood pressure and flow exert mechanical forces on the walls of small arteries, which are detected by the endothelial and smooth muscle cells, and lead to regulation of the diameter (basal tone) of an artery. CaV 3.2 T-type calcium channels are expressed in the wall of small arteries, although their function remains poorly understood because of the low specificity of T-type blockers. We used mice deficient in CaV 3.2 channels to study their role in pressure- and flow-dependent tone regulation and the possible impact of ageing on this role. In young mice, CaV 3.2 channels oppose pressure-induced vasoconstriction and participate in endothelium-dependent, flow-mediated dilatation. These effects were not seen in mature adult mice. The results of the present study demonstrate an age-dependent impact of CaV 3.2 T-type calcium channel deletion in rodents and suggest that the loss of CaV 3.2 channel function leads to more constricted arteries, which is a risk factor for cardiovascular disease. ABSTRACT The myogenic response and flow-mediated vasodilatation are important regulators of local blood perfusion and total peripheral resistance, and are known to entail a calcium influx into vascular smooth muscle cells (VSMCs) and endothelial cells (ECs), respectively. CaV 3.2 T-type calcium channels are expressed in both VSMCs and ECs of small arteries. The T-type channels are important drug targets but, as a result of the lack of specific antagonists, our understanding of the role of CaV 3.2 channels in vasomotor tone at various ages is scarce. We evaluated the myogenic response, flow-mediated vasodilatation, structural remodelling and mRNA + protein expression in small mesenteric arteries from CaV 3.2 knockout (CaV 3.2KO) vs. wild-type mice at a young vs. mature adult age. In young mice only, deletion of CaV 3.2 led to an enhanced myogenic response and a ∼50% reduction of flow-mediated vasodilatation. Ni2+ had both CaV 3.2-dependent and independent effects. No changes in mRNA expression of several important K+ and Ca2+ channel genes were induced by CaV 3.2KO However, the expression of the other T-type channel isoform (CaV 3.1) was reduced at the mRNA and protein level in mature adult compared to young wild-type arteries. The results of the present study demonstrate the important roles of the CaV 3.2 T-type calcium channels in myogenic tone and flow-mediated vasodilatation that disappear with ageing. Because increased arterial tone is a risk factor for cardiovascular disease, we conclude that CaV 3.2 channels, by modulating pressure- and flow-mediated vasomotor responses to prevent excess arterial tone, protect against cardiovascular disease.
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Affiliation(s)
- Miriam F Mikkelsen
- Department of Veterinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Karl Björling
- Department of Veterinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lars Jørn Jensen
- Department of Veterinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
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18
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Ghosh D, Syed AU, Prada MP, Nystoriak MA, Santana LF, Nieves-Cintrón M, Navedo MF. Calcium Channels in Vascular Smooth Muscle. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2016; 78:49-87. [PMID: 28212803 DOI: 10.1016/bs.apha.2016.08.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Calcium (Ca2+) plays a central role in excitation, contraction, transcription, and proliferation of vascular smooth muscle cells (VSMs). Precise regulation of intracellular Ca2+ concentration ([Ca2+]i) is crucial for proper physiological VSM function. Studies over the last several decades have revealed that VSMs express a variety of Ca2+-permeable channels that orchestrate a dynamic, yet finely tuned regulation of [Ca2+]i. In this review, we discuss the major Ca2+-permeable channels expressed in VSM and their contribution to vascular physiology and pathology.
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Affiliation(s)
- D Ghosh
- University of California, Davis, CA, United States
| | - A U Syed
- University of California, Davis, CA, United States
| | - M P Prada
- University of California, Davis, CA, United States
| | - M A Nystoriak
- Diabetes and Obesity Center, University of Louisville, Louisville, KY, United States
| | - L F Santana
- University of California, Davis, CA, United States
| | | | - M F Navedo
- University of California, Davis, CA, United States.
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19
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Abstract
cGMP controls many cellular functions ranging from growth, viability, and differentiation to contractility, secretion, and ion transport. The mammalian genome encodes seven transmembrane guanylyl cyclases (GCs), GC-A to GC-G, which mainly modulate submembrane cGMP microdomains. These GCs share a unique topology comprising an extracellular domain, a short transmembrane region, and an intracellular COOH-terminal catalytic (cGMP synthesizing) region. GC-A mediates the endocrine effects of atrial and B-type natriuretic peptides regulating arterial blood pressure/volume and energy balance. GC-B is activated by C-type natriuretic peptide, stimulating endochondral ossification in autocrine way. GC-C mediates the paracrine effects of guanylins on intestinal ion transport and epithelial turnover. GC-E and GC-F are expressed in photoreceptor cells of the retina, and their activation by intracellular Ca(2+)-regulated proteins is essential for vision. Finally, in the rodent system two olfactorial GCs, GC-D and GC-G, are activated by low concentrations of CO2and by peptidergic (guanylins) and nonpeptidergic odorants as well as by coolness, which has implications for social behaviors. In the past years advances in human and mouse genetics as well as the development of sensitive biosensors monitoring the spatiotemporal dynamics of cGMP in living cells have provided novel relevant information about this receptor family. This increased our understanding of the mechanisms of signal transduction, regulation, and (dys)function of the membrane GCs, clarified their relevance for genetic and acquired diseases and, importantly, has revealed novel targets for therapies. The present review aims to illustrate these different features of membrane GCs and the main open questions in this field.
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Affiliation(s)
- Michaela Kuhn
- Institute of Physiology, University of Würzburg, Würzburg, Germany
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20
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Shariatpanahi M, Khodagholi F, Ashabi G, Bonakdar Yazdi B, Hassani S, Azami K, Abdollahi M, Noorbakhsh F, Taghizadeh G, Sharifzadeh M. The involvement of protein kinase G inhibitor in regulation of apoptosis and autophagy markers in spatial memory deficit induced by Aβ. Fundam Clin Pharmacol 2016; 30:364-75. [DOI: 10.1111/fcp.12196] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 03/04/2016] [Accepted: 03/10/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Marjan Shariatpanahi
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Fariba Khodagholi
- NeuroBiology Research Center; Shahid Beheshti University of Medical Sciences; Tehran Iran
- Neuroscience Research Center; Shahid Beheshti University of Medical Sciences; Tehran Iran
| | - Ghorbangol Ashabi
- Department of Physiology; Physiology Research Center; School of Medicine; Ahvaz Jundishapur University of Medical Sciences; Ahvaz Iran
| | - Behnoosh Bonakdar Yazdi
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Shokoufeh Hassani
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Kian Azami
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Mohammad Abdollahi
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
| | - Farshid Noorbakhsh
- Department of Immunology; Faculty of Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - Ghorban Taghizadeh
- Department of Neuroscience; Faculty of Advanced Science and Technology in Medicine; Tehran University of Medical Sciences; Tehran Iran
| | - Mohammad Sharifzadeh
- Department of Toxicology and Pharmacology; Faculty of Pharmacy; Tehran University of Medical Sciences; Tehran Iran
- Department of Neuroscience; Faculty of Advanced Science and Technology in Medicine; Tehran University of Medical Sciences; Tehran Iran
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21
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Daiber A, Münzel T. Organic Nitrate Therapy, Nitrate Tolerance, and Nitrate-Induced Endothelial Dysfunction: Emphasis on Redox Biology and Oxidative Stress. Antioxid Redox Signal 2015; 23:899-942. [PMID: 26261901 PMCID: PMC4752190 DOI: 10.1089/ars.2015.6376] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Organic nitrates, such as nitroglycerin (GTN), isosorbide-5-mononitrate and isosorbide dinitrate, and pentaerithrityl tetranitrate (PETN), when given acutely, have potent vasodilator effects improving symptoms in patients with acute and chronic congestive heart failure, stable coronary artery disease, acute coronary syndromes, or arterial hypertension. The mechanisms underlying vasodilation include the release of •NO or a related compound in response to intracellular bioactivation (for GTN, the mitochondrial aldehyde dehydrogenase [ALDH-2]) and activation of the enzyme, soluble guanylyl cyclase. Increasing cyclic guanosine-3',-5'-monophosphate (cGMP) levels lead to an activation of the cGMP-dependent kinase I, thereby causing the relaxation of the vascular smooth muscle by decreasing intracellular calcium concentrations. The hemodynamic and anti-ischemic effects of organic nitrates are rapidly lost upon long-term (low-dose) administration due to the rapid development of tolerance and endothelial dysfunction, which is in most cases linked to increased intracellular oxidative stress. Enzymatic sources of reactive oxygen species under nitrate therapy include mitochondria, NADPH oxidases, and an uncoupled •NO synthase. Acute high-dose challenges with organic nitrates cause a similar loss of potency (tachyphylaxis), but with distinct pathomechanism. The differences among organic nitrates are highlighted regarding their potency to induce oxidative stress and subsequent tolerance and endothelial dysfunction. We also address pleiotropic effects of organic nitrates, for example, their capacity to stimulate antioxidant pathways like those demonstrated for PETN, all of which may prevent adverse effects in response to long-term therapy. Based on these considerations, we will discuss and present some preclinical data on how the nitrate of the future should be designed.
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Affiliation(s)
- Andreas Daiber
- The 2nd Medical Clinic, Medical Center of the Johannes Gutenberg University , Mainz, Germany
| | - Thomas Münzel
- The 2nd Medical Clinic, Medical Center of the Johannes Gutenberg University , Mainz, Germany
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22
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Abstract
Ion channels are critical for all aspects of cardiac function, including rhythmicity and contractility. Consequently, ion channels are key targets for therapeutics aimed at cardiac pathophysiologies such as atrial fibrillation or angina. At the same time, off-target interactions of drugs with cardiac ion channels can be the cause of unwanted side effects. This manuscript aims to review the physiology and pharmacology of key cardiac ion channels. The intent is to highlight recent developments for therapeutic development, as well as elucidate potential mechanisms for drug-induced cardiac side effects, rather than present an in-depth review of each channel subtype.
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Ibrahim AF, Blohm E, Hammad H. Management of Status Asthmaticus. CURRENT EMERGENCY AND HOSPITAL MEDICINE REPORTS 2015. [DOI: 10.1007/s40138-015-0081-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Intrarenal autoregulatory mechanisms maintain renal blood flow (RBF) and glomerular filtration rate (GFR) independent of renal perfusion pressure (RPP) over a defined range (80-180 mmHg). Such autoregulation is mediated largely by the myogenic and the macula densa-tubuloglomerular feedback (MD-TGF) responses that regulate preglomerular vasomotor tone primarily of the afferent arteriole. Differences in response times allow separation of these mechanisms in the time and frequency domains. Mechanotransduction initiating the myogenic response requires a sensing mechanism activated by stretch of vascular smooth muscle cells (VSMCs) and coupled to intracellular signaling pathways eliciting plasma membrane depolarization and a rise in cytosolic free calcium concentration ([Ca(2+)]i). Proposed mechanosensors include epithelial sodium channels (ENaC), integrins, and/or transient receptor potential (TRP) channels. Increased [Ca(2+)]i occurs predominantly by Ca(2+) influx through L-type voltage-operated Ca(2+) channels (VOCC). Increased [Ca(2+)]i activates inositol trisphosphate receptors (IP3R) and ryanodine receptors (RyR) to mobilize Ca(2+) from sarcoplasmic reticular stores. Myogenic vasoconstriction is sustained by increased Ca(2+) sensitivity, mediated by protein kinase C and Rho/Rho-kinase that favors a positive balance between myosin light-chain kinase and phosphatase. Increased RPP activates MD-TGF by transducing a signal of epithelial MD salt reabsorption to adjust afferent arteriolar vasoconstriction. A combination of vascular and tubular mechanisms, novel to the kidney, provides for high autoregulatory efficiency that maintains RBF and GFR, stabilizes sodium excretion, and buffers transmission of RPP to sensitive glomerular capillaries, thereby protecting against hypertensive barotrauma. A unique aspect of the myogenic response in the renal vasculature is modulation of its strength and speed by the MD-TGF and by a connecting tubule glomerular feedback (CT-GF) mechanism. Reactive oxygen species and nitric oxide are modulators of myogenic and MD-TGF mechanisms. Attenuated renal autoregulation contributes to renal damage in many, but not all, models of renal, diabetic, and hypertensive diseases. This review provides a summary of our current knowledge regarding underlying mechanisms enabling renal autoregulation in health and disease and methods used for its study.
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Affiliation(s)
- Mattias Carlström
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Christopher S Wilcox
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - William J Arendshorst
- Department of Medicine, Division of Nephrology and Hypertension and Hypertension, Kidney and Vascular Research Center, Georgetown University, Washington, District of Columbia; Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden; and Department of Cell Biology and Physiology, UNC Kidney Center, and McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Hansen PBL. Functional importance of T-type voltage-gated calcium channels in the cardiovascular and renal system: news from the world of knockout mice. Am J Physiol Regul Integr Comp Physiol 2015; 308:R227-37. [DOI: 10.1152/ajpregu.00276.2014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Over the years, it has been discussed whether T-type calcium channels Cav3 play a role in the cardiovascular and renal system. T-type channels have been reported to play an important role in renal hemodynamics, contractility of resistance vessels, and pacemaker activity in the heart. However, the lack of highly specific blockers cast doubt on the conclusions. As new T-type channel antagonists are being designed, the roles of T-type channels in cardiovascular and renal pathology need to be elucidated before T-type blockers can be clinically useful. Two types of T-type channels, Cav3.1 and Cav3.2, are expressed in blood vessels, the kidney, and the heart. Studies with gene-deficient mice have provided a way to investigate the Cav3.1 and Cav3.2 channels and their role in the cardiovascular system. This review discusses the results from these knockout mice. Evaluation of the literature leads to the conclusion that Cav3.1 and Cav3.2 channels have important, but different, functions in mice. T-type Cav3.1 channels affect heart rate, whereas Cav3.2 channels are involved in cardiac hypertrophy. In the vascular system, Cav3.2 activation leads to dilation of blood vessels, whereas Cav3.1 channels are mainly suggested to affect constriction. The Cav3.1 channel is also involved in neointima formation following vascular damage. In the kidney, Cav3.1 regulates plasma flow and Cav3.2 plays a role setting glomerular filtration rate. In conclusion, Cav3.1 and Cav3.2 are new therapeutic targets in several cardiovascular pathologies, but the use of T-type blockers should be specifically directed to the disease and to the channel subtype.
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Affiliation(s)
- Pernille B. L. Hansen
- Department of Cardiovascular and Renal Research, Institute of Molecular Medicine, University of Southern Denmark, Odense C, Denmark
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Tomasova L, Pavlovicova M, Malekova L, Misak A, Kristek F, Grman M, Cacanyiova S, Tomasek M, Tomaskova Z, Perry A, Wood ME, Lacinova L, Ondrias K, Whiteman M. Effects of AP39, a novel triphenylphosphonium derivatised anethole dithiolethione hydrogen sulfide donor, on rat haemodynamic parameters and chloride and calcium Cav3 and RyR2 channels. Nitric Oxide 2014; 46:131-44. [PMID: 25555533 DOI: 10.1016/j.niox.2014.12.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 12/04/2014] [Accepted: 12/25/2014] [Indexed: 12/18/2022]
Abstract
H2S donor molecules have the potential to be viable therapeutic agents. The aim of this current study was (i) to investigate the effects of a novel triphenylphosphonium derivatised dithiolethione (AP39), in the presence and absence of reduced nitric oxide bioavailability and (ii) to determine the effects of AP39 on myocardial membrane channels; CaV3, RyR2 and Cl(-). Normotensive, L-NAME- or phenylephrine-treated rats were administered Na2S, AP39 or control compounds (AP219 and ADT-OH) (0.25-1 µmol kg(-1)i.v.) and haemodynamic parameters measured. The involvement of membrane channels T-type Ca(2+) channels CaV3.1, CaV3.2 and CaV3.3 as well as Ca(2+) ryanodine (RyR2) and Cl(-) single channels derived from rat heart sarcoplasmic reticulum were also investigated. In anaesthetised Wistar rats, AP39 (0.25-1 µmol kg(-1) i.v) transiently decreased blood pressure, heart rate and pulse wave velocity, whereas AP219 and ADT-OH and Na2S had no significant effect. In L-NAME treated rats, AP39 significantly lowered systolic blood pressure for a prolonged period, decreased heart rate and arterial stiffness. In electrophysiological studies, AP39 significantly inhibited Ca(2+) current through all three CaV3 channels. AP39 decreased RyR2 channels activity and increased conductance and mean open time of Cl(-) channels. This study suggests that AP39 may offer a novel therapeutic opportunity in conditions whereby (•)NO and H2S bioavailability are deficient such as hypertension, and that CaV3, RyR2 and Cl(-) cardiac membrane channels might be involved in its biological actions.
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Affiliation(s)
- Lenka Tomasova
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia; Faculty of Pharmacy, Comenius University, Bratislava, Slovakia
| | | | - Lubica Malekova
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia
| | - Anton Misak
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia
| | - Frantisek Kristek
- Institute of Normal and Pathological Physiology, SAS, Bratislava, Slovakia
| | - Marian Grman
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia; Center for Molecular Medicine, SAS, Bratislava, Slovakia
| | - Sona Cacanyiova
- Institute of Normal and Pathological Physiology, SAS, Bratislava, Slovakia
| | | | - Zuzana Tomaskova
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia
| | - Alexis Perry
- Department of Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Mark E Wood
- Department of Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Lubica Lacinova
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia
| | - Karol Ondrias
- Institute of Molecular Physiology and Genetics, SAS, Bratislava, Slovakia
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Chang JP, Sawisky GR, Davis PJ, Pemberton JG, Rieger AM, Barreda DR. Relationship between nitric oxide- and calcium-dependent signal transduction pathways in growth hormone release from dispersed goldfish pituitary cells. Gen Comp Endocrinol 2014; 206:118-29. [PMID: 25038498 DOI: 10.1016/j.ygcen.2014.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/05/2014] [Accepted: 07/08/2014] [Indexed: 11/17/2022]
Abstract
Nitric oxide (NO) and Ca(2+) are two of the many intracellular signal transduction pathways mediating the control of growth hormone (GH) secretion from somatotropes by neuroendocrine factors. We have previously shown that the NO donor sodium nitroprusside (SNP) elicits Ca(2+) signals in identified goldfish somatotropes. In this study, we examined the relationships between NO- and Ca(2+)-dependent signal transduction mechanisms in GH secretion from primary cultures of dispersed goldfish pituitary cells. Morphologically identified goldfish somatotropes stained positively for an NO-sensitive dye indicating they may be a source of NO production. In 2h static incubation experiments, GH release responses to the NO donor S-nitroso-N-acetyl-d,l-penicillamine (SNAP) were attenuated by CoCl2, nifedipine, verapamil, TMB-8, BHQ, and KN62. In column perifusion experiments, the ability of SNP to induce GH release was impaired in the presence of TMB-8, BHQ, caffeine, and thapsigargin, but not ryanodine. Caffeine-elicited GH secretion was not affected by the NO scavenger PTIO. These results suggest that NO-stimulated GH release is dependent on extracellular Ca(2+) availability and voltage-sensitive Ca(2+) channels, as well as intracellular Ca(2+) store(s) that possess BHQ- and/or thapsigargin-inhibited sarcoplasmic/endoplasmic reticulum Ca(2+)-ATPases, as well as TMB-8- and/or caffeine-sensitive, but not ryanodine-sensitive, Ca(2+)-release channels. Calmodulin kinase-II also likely participates in NO-elicited GH secretion but caffeine-induced GH release is not upstream of NO production. These findings provide insights into how NO actions many integrate with Ca(2+)-dependent signalling mechanisms in goldfish somatotropes and how such interactions may participate in the GH-releasing actions of regulators that utilize both NO- and Ca(2+)-dependent transduction pathways.
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Affiliation(s)
- John P Chang
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada.
| | - Grant R Sawisky
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Philip J Davis
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Joshua G Pemberton
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Aja M Rieger
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - Daniel R Barreda
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada; Department of Agriculture, Forestry and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
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28
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Harraz OF, Abd El-Rahman RR, Bigdely-Shamloo K, Wilson SM, Brett SE, Romero M, Gonzales AL, Earley S, Vigmond EJ, Nygren A, Menon BK, Mufti RE, Watson T, Starreveld Y, Furstenhaupt T, Muellerleile PR, Kurjiaka DT, Kyle BD, Braun AP, Welsh DG. Ca(V)3.2 channels and the induction of negative feedback in cerebral arteries. Circ Res 2014; 115:650-61. [PMID: 25085940 DOI: 10.1161/circresaha.114.304056] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
RATIONALE T-type (CaV3.1/CaV3.2) Ca(2+) channels are expressed in rat cerebral arterial smooth muscle. Although present, their functional significance remains uncertain with findings pointing to a variety of roles. OBJECTIVE This study tested whether CaV3.2 channels mediate a negative feedback response by triggering Ca(2+) sparks, discrete events that initiate arterial hyperpolarization by activating large-conductance Ca(2+)-activated K(+) channels. METHODS AND RESULTS Micromolar Ni(2+), an agent that selectively blocks CaV3.2 but not CaV1.2/CaV3.1, was first shown to depolarize/constrict pressurized rat cerebral arteries; no effect was observed in CaV3.2(-/-) arteries. Structural analysis using 3-dimensional tomography, immunolabeling, and a proximity ligation assay next revealed the existence of microdomains in cerebral arterial smooth muscle which comprised sarcoplasmic reticulum and caveolae. Within these discrete structures, CaV3.2 and ryanodine receptor resided in close apposition to one another. Computational modeling revealed that Ca(2+) influx through CaV3.2 could repetitively activate ryanodine receptor, inducing discrete Ca(2+)-induced Ca(2+) release events in a voltage-dependent manner. In keeping with theoretical observations, rapid Ca(2+) imaging and perforated patch clamp electrophysiology demonstrated that Ni(2+) suppressed Ca(2+) sparks and consequently spontaneous transient outward K(+) currents, large-conductance Ca(2+)-activated K(+) channel mediated events. Additional functional work on pressurized arteries noted that paxilline, a large-conductance Ca(2+)-activated K(+) channel inhibitor, elicited arterial constriction equivalent, and not additive, to Ni(2+). Key experiments on human cerebral arteries indicate that CaV3.2 is present and drives a comparable response to moderate constriction. CONCLUSIONS These findings indicate for the first time that CaV3.2 channels localize to discrete microdomains and drive ryanodine receptor-mediated Ca(2+) sparks, enabling large-conductance Ca(2+)-activated K(+) channel activation, hyperpolarization, and attenuation of cerebral arterial constriction.
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Affiliation(s)
- Osama F Harraz
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Rasha R Abd El-Rahman
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Kamran Bigdely-Shamloo
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Sean M Wilson
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Suzanne E Brett
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Monica Romero
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Albert L Gonzales
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Scott Earley
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Edward J Vigmond
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Anders Nygren
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Bijoy K Menon
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Rania E Mufti
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Tim Watson
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Yves Starreveld
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Tobias Furstenhaupt
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Philip R Muellerleile
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - David T Kurjiaka
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Barry D Kyle
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Andrew P Braun
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.)
| | - Donald G Welsh
- From the Department of Physiology and Pharmacology, Hotchkiss Brain and Libin Cardiovascular Institutes (O.F.H., R.R.A.E.-R., K.B.-S., S.E.B., R.E.M., B.D.K., A.P.B., D.G.W.), Department of Electrical and Computer Engineering (K.B.-S., E.J.V., A.N.), Department of Clinical Neurosciences (B.K.M., T.W., Y.S.), and Microscopy Imaging Facility (T.F.), University of Calgary, Calgary, Alberta, Canada; Department of Pharmacology and Toxicology, Alexandria University, Alexandria, Egypt (O.F.H.); Division of Pharmacology, Loma Linda University, CA (S.M.W., M.R.); Department of Biomedical Sciences, Colorado State University, Fort Collins (A.L.G.); Department of Pharmacology, University of Nevada, Reno (S.E.); LIRYC Institute and Lab IMB, University of Bordeaux, Bordeaux, France (E.J.V.); and Department of Biomedical Sciences, Grand Valley State University, Allendale, MI (P.R.M., D.T.K.). dwelsh@ucalgary
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Chevalier M, Gilbert G, Roux E, Lory P, Marthan R, Savineau JP, Quignard JF. T-type calcium channels are involved in hypoxic pulmonary hypertension. Cardiovasc Res 2014; 103:597-606. [PMID: 25016616 DOI: 10.1093/cvr/cvu166] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
AIMS Pulmonary hypertension (PH) is the main disease of pulmonary circulation. Alteration in calcium homeostasis in pulmonary artery smooth muscle cells (PASMCs) is recognized as a key feature in PH. The present study was undertaken to investigate the involvement of T-type voltage-gated calcium channels (T-VGCCs) in the control of the pulmonary vascular tone and thereby in the development of PH. METHODS AND RESULTS Experiments were conducted in animals (rats and mice) kept 3-4 weeks in either normal (normoxic) or hypoxic environment (hypobaric chamber) to induce chronic hypoxia (CH) PH. In vivo, chronic treatment of CH rats with the T-VGCC blocker, TTA-A2, prevented PH and the associated vascular hyperreactivity, pulmonary arterial remodelling, and right cardiac hypertrophy. Deletion of the Cav3.1 gene (a T-VGCC isoform) protected mice from CH-PH. In vitro, patch-clamp and PCR experiments revealed the presence of T-VGCCs (mainly Cav3.1 and Cav3.2) in PASMCs. Mibefradil, NNC550396, and TTA-A2 inhibited, in a concentration-dependent manner, T-VGCC current, KCl-induced contraction, and PASMC proliferation. CONCLUSION The present study demonstrates that T-VGCCs contribute to intrapulmonary vascular reactivity and is implicated in the development of hypoxic PH. Specific blockers of T-VGCCs may thus prove useful for the therapeutic management of PH.
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Affiliation(s)
- Marc Chevalier
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France
| | - Guillaume Gilbert
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France
| | - Etienne Roux
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France
| | - Philipe Lory
- CNRS, UMR-5203, Institut de Génomique Fonctionnelle, Montpellier, France
| | - Roger Marthan
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France CHU Bordeaux, Exploration Fonctionnelle Respiratoire, Bordeaux, France
| | - Jean-Pierre Savineau
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France
| | - Jean-François Quignard
- Université de Bordeaux, Centre de Recherche Cardio-Thoracique de Bordeaux, U 1045, Bordeaux F-33000, France INSERM, Centre de Recherche Cardio-Thoracique de Bordeaux, 1045, Bordeaux, France
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Del Pozzi AT, Pandey A, Medow MS, Messer ZR, Stewart JM. Blunted cerebral blood flow velocity in response to a nitric oxide donor in postural tachycardia syndrome. Am J Physiol Heart Circ Physiol 2014; 307:H397-404. [PMID: 24878770 DOI: 10.1152/ajpheart.00194.2014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cognitive deficits are characteristic of postural tachycardia syndrome (POTS). Intact nitrergic nitric oxide (NO) is important to cerebral blood flow (CBF) regulation, neurovascular coupling, and cognitive efficacy. POTS patients often experience defective NO-mediated vasodilation caused by oxidative stress. We have previously shown dilation of the middle cerebral artery in response to a bolus administration of the NO donor sodium nitroprusside (SNP) in healthy volunteers. In the present study, we hypothesized a blunted middle cerebral artery response to SNP in POTS. We used combined transcranial Doppler-ultrasound to measure CBF velocity and near-infrared spectroscopy to measure cerebral hemoglobin oxygenation while subjects were in the supine position. The responses of 17 POTS patients were compared with 12 healthy control subjects (age: 14-28 yr). CBF velocity in POTS patients and control subjects were not different at baseline (75 ± 3 vs. 71 ± 2 cm/s, P = 0.31) and decreased to a lesser degree with SNP in POTS patients (to 71 ± 3 vs. 62 ± 2 cm/s, P = 0.02). Changes in total and oxygenated hemoglobin (8.83 ± 0.45 and 8.13 ± 0.48 μmol/kg tissue) were markedly reduced in POTS patients compared with control subjects (14.2 ± 1.4 and 13.6 ± 1.6 μmol/kg tissue), primarily due to increased venous efflux. The data indicate reduced cerebral oxygenation, blunting of cerebral arterial vasodilation, and heightened cerebral venodilation. We conclude, based on the present study outcomes, that decreased bioavailability of NO is apparent in the vascular beds, resulting in a downregulation of NO receptor sites, ultimately leading to blunted responses to exogenous NO.
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Affiliation(s)
- Andrew T Del Pozzi
- Departments of Pediatrics and Physiology, New York Medical College, Center for Hypotension, Hawthorne, New York
| | - Akash Pandey
- Departments of Pediatrics and Physiology, New York Medical College, Center for Hypotension, Hawthorne, New York
| | - Marvin S Medow
- Departments of Pediatrics and Physiology, New York Medical College, Center for Hypotension, Hawthorne, New York
| | - Zachary R Messer
- Departments of Pediatrics and Physiology, New York Medical College, Center for Hypotension, Hawthorne, New York
| | - Julian M Stewart
- Departments of Pediatrics and Physiology, New York Medical College, Center for Hypotension, Hawthorne, New York
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T-type Ca2+ channels facilitate NO-formation, vasodilatation and NO-mediated modulation of blood pressure. Pflugers Arch 2014; 466:2205-14. [DOI: 10.1007/s00424-014-1492-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 02/25/2014] [Accepted: 02/26/2014] [Indexed: 11/28/2022]
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Role of T-type channels in vasomotor function: team player or chameleon? Pflugers Arch 2014; 466:767-79. [PMID: 24482062 DOI: 10.1007/s00424-013-1430-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 12/19/2013] [Indexed: 01/28/2023]
Abstract
Low-voltage-activated T-type calcium channels play an important role in regulating cellular excitability and are implicated in conditions, such as epilepsy and neuropathic pain. T-type channels, especially Cav3.1 and Cav3.2, are also expressed in the vasculature, although patch clamp studies of isolated vascular smooth muscle cells have in general failed to demonstrate these low-voltage-activated calcium currents. By contrast, the channels which are blocked by T-type channel antagonists are high-voltage activated but distinguishable from their L-type counterparts by their T-type biophysical properties and small negative shifts in activation and inactivation voltages. These changes in T-channel properties may result from vascular-specific expression of splice variants of Cav3 genes, particularly in exon 25/26 of the III-IV linker region. Recent physiological studies suggest that T-type channels make a small contribution to vascular tone at low intraluminal pressures, although the relevance of this contribution is unclear. By contrast, these channels play a larger role in vascular tone of small arterioles, which would be expected to function at lower intra-vascular pressures. Upregulation of T-type channel function following decrease in nitric oxide bioavailability and increase in oxidative stress, which occurs during cardiovascular disease, suggests that a more important role could be played by these channels in pathophysiological situations. The ability of T-type channels to be rapidly recruited to the plasma membrane, coupled with their subtype-specific localisation in signalling microdomains where they could modulate the function of calcium-dependent ion channels and pathways, provides a mechanism for rapid up- and downregulation of vasoconstriction. Future investigation into the molecules which govern these changes may illuminate novel targets for the treatment of conditions such as therapy-resistant hypertension and vasospasm.
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