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Liu T, Zhang M, Hanson S, Juarez R, Wilson S, Schroeder H, Li Q, Zhu L, Zhang G, Blood AB. H 2S Increases Blood Pressure via Activation of L-Type Calcium Channels with Mediation by HS • Generated from Reactions with Oxyhemoglobin. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305866. [PMID: 38685626 PMCID: PMC11234399 DOI: 10.1002/advs.202305866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 03/04/2024] [Indexed: 05/02/2024]
Abstract
Although the gasotransmitter hydrogen sulfide (H2S) is well known for its vasodilatory effects, H2S also exhibits vasoconstricting properties. Herein, it is demonstrated that administration of H2S as intravenous sodium sulfide (Na2S) increased blood pressure in sheep and rats, and this effect persisted after H2S has disappeared from the blood. Inhibition of the L-type calcium channel (LTCC) diminished the hypertensive effects. Incubation of Na2S with whole blood, red blood cells, methemoglobin, or oxyhemoglobin produced a hypertensive product of H2S, which is not hydrogen thioperoxide, metHb-SH- complexes, per-/poly- sulfides, or thiolsulfate, but rather a labile intermediate. One-electron oxidation of H2S by oxyhemoglobin generated its redox cousin, sulfhydryl radical (HS•). Consistent with the role of HS• as the hypertensive intermediate, scavenging HS• inhibited Na2S-induced vasoconstriction and activation of LTCCs. In conclusion, H2S causes vasoconstriction that is dependent on the activation of LTCCs and generation of HS• by oxyhemoglobin.
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Affiliation(s)
- Taiming Liu
- Division of NeonatologyDepartment of PediatricsLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Meijuan Zhang
- Division of NeonatologyDepartment of PediatricsLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Shawn Hanson
- Lawrence D. Longo Center for Perinatal BiologyLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Rucha Juarez
- Lawrence D. Longo Center for Perinatal BiologyLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Sean Wilson
- Lawrence D. Longo Center for Perinatal BiologyLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Hobe Schroeder
- Lawrence D. Longo Center for Perinatal BiologyLoma Linda University School of MedicineLoma LindaCA92354USA
| | - Qian Li
- Department of MedicineGregory Fleming James Cystic Fibrosis Research CenterUniversity of Alabama at BirminghamBirminghamAL35294UK
| | - Lingchao Zhu
- Department of ChemistryUniversity of CaliforniaRiversideCA92521USA
| | - Guangyu Zhang
- Mass spectrometry core facilityLoma Linda UniversityLoma LindaCA92354USA
| | - Arlin B. Blood
- Division of NeonatologyDepartment of PediatricsLoma Linda University School of MedicineLoma LindaCA92354USA
- Lawrence D. Longo Center for Perinatal BiologyLoma Linda University School of MedicineLoma LindaCA92354USA
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Liu T, Zhang M, Duot A, Mukosera G, Schroeder H, Power GG, Blood AB. Artifacts Introduced by Sample Handling in Chemiluminescence Assays of Nitric Oxide Metabolites. Antioxidants (Basel) 2023; 12:1672. [PMID: 37759975 PMCID: PMC10525973 DOI: 10.3390/antiox12091672] [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: 07/30/2023] [Revised: 08/16/2023] [Accepted: 08/18/2023] [Indexed: 09/29/2023] Open
Abstract
We recently developed a combination of four chemiluminescence-based assays for selective detection of different nitric oxide (NO) metabolites, including nitrite, S-nitrosothiols (SNOs), heme-nitrosyl (heme-NO), and dinitrosyl iron complexes (DNICs). However, these NO species (NOx) may be under dynamic equilibria during sample handling, which affects the final determination made from the readout of assays. Using fetal and maternal sheep from low and high altitudes (300 and 3801 m, respectively) as models of different NOx levels and compositions, we tested the hypothesis that sample handling introduces artifacts in chemiluminescence assays of NOx. Here, we demonstrate the following: (1) room temperature placement is associated with an increase and decrease in NOx in plasma and whole blood samples, respectively; (2) snap freezing and thawing lead to the interconversion of different NOx in plasma; (3) snap freezing and homogenization in liquid nitrogen eliminate a significant fraction of NOx in the aorta of stressed animals; (4) A "stop solution" commonly used to preserve nitrite and SNOs leads to the interconversion of different NOx in blood, while deproteinization results in a significant increase in detectable NOx; (5) some reagents widely used in sample pretreatments, such as mercury chloride, acid sulfanilamide, N-ethylmaleimide, ferricyanide, and anticoagulant ethylenediaminetetraacetic acid, have unintended effects that destabilize SNO, DNICs, and/or heme-NO; (6) blood, including the residual blood clot left in the washed purge vessel, quenches the signal of nitrite when using ascorbic acid and acetic acid as the purge vessel reagent; and (7) new limitations to the four chemiluminescence-based assays. This study points out the need for re-evaluation of previous chemiluminescence measurements of NOx, and calls for special attention to be paid to sample handling, as it can introduce significant artifacts into NOx assays.
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Affiliation(s)
- Taiming Liu
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (T.L.); (M.Z.); (A.D.)
| | - Meijuan Zhang
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (T.L.); (M.Z.); (A.D.)
| | - Abraham Duot
- Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (T.L.); (M.Z.); (A.D.)
| | - George Mukosera
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (G.M.); (H.S.)
| | - Hobe Schroeder
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (G.M.); (H.S.)
| | - Gordon G. Power
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (G.M.); (H.S.)
| | - Arlin B. Blood
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA; (G.M.); (H.S.)
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Iqbal H, Verma AK, Yadav P, Alam S, Shafiq M, Mishra D, Khan F, Hanif K, Negi AS, Chanda D. Antihypertensive Effect of a Novel Angiotensin II Receptor Blocker Fluorophenyl Benzimidazole: Contribution of cGMP, Voltage-dependent Calcium Channels, and BK Ca Channels to Vasorelaxant Mechanisms. Front Pharmacol 2021; 12:611109. [PMID: 33859561 PMCID: PMC8042648 DOI: 10.3389/fphar.2021.611109] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 02/09/2021] [Indexed: 12/03/2022] Open
Abstract
Background: The current study presents the novel angiotensin II receptor blocker fluorophenyl benzimidazole (FPD) as an antihypertensive agent in the SHR model of hypertension. We investigated the role of cGMP, voltage-dependent L-type calcium channels, and BKCa channels in the vasorelaxant mechanisms of FPD in the rat superior mesenteric artery. Methods: The antihypertensive effect of FPD was examined using an invasive technique measuring blood pressure in SHR animals. Using a myograph, tension measurement was completed in the superior mesenteric artery to elucidate the mechanisms of vasorelaxation involving AT1 receptors, the NO/cGMP pathway, L-type calcium channels, and BKCa channels. Ion flux (Ca2+, K+) studies were conducted in aortic smooth muscle cells. Putative targets proteins were determined by in silico docking studies. A safety evaluation of FPD was carried out using Swiss albino mice. Results: FPD significantly decreased blood pressure in SHR. It relaxed superior mesenteric arteries in a concentration-dependent manner and significantly inhibited angiotensin II-induced contraction. The relaxation response was also mediated by an increase in tissue cGMP levels, inhibition of L-type calcium channels, and the opening of BKCa channels. FPD further enhanced efflux of K+ and inhibited Bay K8644-stimulated Ca2+ influx in aortic smooth muscle cells and docked well in an in silico study with the targets. It was well tolerated in the toxicity study. Conclusion: The present study reports the antihypertensive activity of novel AT-1 receptor blocker FPD at 50 and 100 mg kg−1 with cGMP, L-type calcium channels, and BKCa channels as putative targets of vasorelaxation, and was found safe in oral toxicity.
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Affiliation(s)
- Hina Iqbal
- Bioprospection and Product Development Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Amit Kumar Verma
- Phytochemistry Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Pankaj Yadav
- Bioprospection and Product Development Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Sarfaraz Alam
- Computational Biology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Mohammad Shafiq
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, India
| | - Divya Mishra
- Bioprospection and Product Development Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Feroz Khan
- Computational Biology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Kashif Hanif
- Division of Pharmacology, CSIR-Central Drug Research Institute, Lucknow, India
| | - Arvind Singh Negi
- Phytochemistry Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Debabrata Chanda
- Bioprospection and Product Development Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
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Blood AB, Liu T, Mukosera G, Hanson SF, Terry MH, Schroeder H, Power GG. Evidence for placental-derived iron-nitrosyls in the circulation of the fetal lamb and against a role for nitrite in mediating the cardiovascular transition at birth. Am J Physiol Regul Integr Comp Physiol 2020; 319:R401-R411. [PMID: 32813540 DOI: 10.1152/ajpregu.00196.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Circulating metabolites of nitric oxide, such as nitrite, iron nitrosyls (FeNO), and nitrosothiols, have vasodilatory bioactivity. In both human and sheep neonates, plasma concentrations of these NO metabolite (NOx) concentrations fall >50% within minutes after birth, raising the possibility that circulating NOx plays a role in maintaining low fetal vascular resistance and in the cardiovascular transition at birth. To test whether the fall in plasma NOx concentrations at birth is due to either ligation of the umbilical cord or oxygenation of the fetus to newborn levels, plasma NOx concentrations were measured during stepwise delivery of near-term fetal lambs. When fetal lambs were intubated and mechanically ventilated with 100% O2 to oxygenate the arterial blood while still in utero with the umbilical circulation still intact, there was no change in plasma NOx levels. In contrast, when the umbilical cord was ligated while fetal lambs were mechanically ventilated with O2 levels that maintained fetal arterial blood gases, plasma NOx levels decreased by nearly 50%. Characterization of the individual NOx species in plasma revealed that the overall fall in NOx at birth was attributable mainly to FeNO compounds. Finally, when the typical fall in NOx after birth was prevented by intravenous nitrite infusion, birth-related changes in blood pressure, heart rate, and carotid flow changes were little affected, suggesting the cardiovascular transition at birth is not dependent on a fall in plasma NOx. In conclusion, this study shows FeNO is released from the placenta and that its decline accounts for most of the measured fall in plasma NOx at birth.
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Affiliation(s)
- Arlin B Blood
- Center for Perinatal Biology, School of Medicine, Loma Linda University, Loma Linda, California.,Department of Pediatrics, School of Medicine, Loma Linda University, Loma Linda, California
| | - Taiming Liu
- Department of Pediatrics, School of Medicine, Loma Linda University, Loma Linda, California
| | - George Mukosera
- Center for Perinatal Biology, School of Medicine, Loma Linda University, Loma Linda, California
| | - Shawn F Hanson
- Center for Perinatal Biology, School of Medicine, Loma Linda University, Loma Linda, California
| | - Michael H Terry
- Department of Medicine, School of Medicine, Loma Linda University, Loma Linda, California
| | - Hobe Schroeder
- Center for Perinatal Biology, School of Medicine, Loma Linda University, Loma Linda, California
| | - Gordon G Power
- Center for Perinatal Biology, School of Medicine, Loma Linda University, Loma Linda, California
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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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Liu T, Mukosera GT, Blood AB. The role of gasotransmitters in neonatal physiology. Nitric Oxide 2019; 95:29-44. [PMID: 31870965 DOI: 10.1016/j.niox.2019.12.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 11/07/2019] [Accepted: 12/17/2019] [Indexed: 12/12/2022]
Abstract
The gasotransmitters, nitric oxide (NO), hydrogen sulfide (H2S), and carbon monoxide (CO), are endogenously-produced volatile molecules that perform signaling functions throughout the body. In biological tissues, these small, lipid-permeable molecules exist in free gaseous form for only seconds or less, and thus they are ideal for paracrine signaling that can be controlled rapidly by changes in their rates of production or consumption. In addition, tissue concentrations of the gasotransmitters are influenced by fluctuations in the level of O2 and reactive oxygen species (ROS). The normal transition from fetus to newborn involves a several-fold increase in tissue O2 tensions and ROS, and requires rapid morphological and functional adaptations to the extrauterine environment. This review summarizes the role of gasotransmitters as it pertains to newborn physiology. Particular focus is given to the vasculature, ventilatory, and gastrointestinal systems, each of which uniquely illustrate the function of gasotransmitters in the birth transition and newborn periods. Moreover, given the relative lack of studies on the role that gasotransmitters play in the newborn, particularly that of H2S and CO, important gaps in knowledge are highlighted throughout the review.
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Affiliation(s)
- Taiming Liu
- Department of Pediatrics, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - George T Mukosera
- Department of Pediatrics, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA
| | - Arlin B Blood
- Department of Pediatrics, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA; Lawrence D. Longo Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, 92354, USA.
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Liu T, Zhang M, Terry MH, Schroeder H, Wilson SM, Power GG, Li Q, Tipple TE, Borchardt D, Blood AB. Hemodynamic Effects of Glutathione-Liganded Binuclear Dinitrosyl Iron Complex: Evidence for Nitroxyl Generation and Modulation by Plasma Albumin. Mol Pharmacol 2018; 93:427-437. [PMID: 29476040 PMCID: PMC5878675 DOI: 10.1124/mol.117.110957] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 02/21/2018] [Indexed: 12/25/2022] Open
Abstract
Glutathione-liganded binuclear dinitrosyl iron complex (glut-BDNIC) has been proposed to be a donor of nitric oxide (NO). This study was undertaken to investigate the mechanisms of vasoactivity, systemic hemodynamic effects, and pharmacokinetics of glut-BDNIC. To test the hypothesis that glut-BDNICs vasodilate by releasing NO in its reduced [nitroxyl (HNO)] state, a bioassay method of isolated, preconstricted ovine mesenteric arterial rings was used in the presence of selective scavengers of HNO or NO free radical (NO•); the vasodilatory effects of glut-BDNIC were found to have characteristics similar to those of an HNO donor and markedly different than an NO• donor. In addition, products of the reaction of glut-BDNIC with CPTIO [2-(4-carboxyphenyl)-4,4,5-tetramethyl imidazoline-1-oxyl-3-oxide] were found to have electron paramagnetic characteristics similar to those of an HNO donor compared with an NO• donor. In contrast to S-nitroso-glutathione, which was vasodilative both in vitro and in vivo, the potency of glut-BDNIC-mediated vasodilation was markedly diminished in both rats and sheep. Wire myography showed that plasma albumin contributed to this loss of hypotensive effects, an effect abolished by modification of the cysteine-thiol residue of albumin. High doses of glut-BDNIC caused long-lasting hypotension in rats that can be at least partially attributed to its long circulating half-life of ∼44 minutes. This study suggests that glut-BDNIC is an HNO donor, and that its vasoactive effects are modulated by binding to the cysteine residue of plasma proteins, such as albumin.
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Affiliation(s)
- Taiming Liu
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Meijuan Zhang
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Michael H Terry
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Hobe Schroeder
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Sean M Wilson
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Gordon G Power
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Qian Li
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Trent E Tipple
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Dan Borchardt
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
| | - Arlin B Blood
- Division of Neonatology, Department of Pediatrics (T.L., M.Z., A.B.B.), Department of Respiratory Care (M.H.T.), and Center for Perinatal Biology (H.S., S.M.W., G.G.P., A.B.B.), Loma Linda University School of Medicine, Loma Linda, California; Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, Alabama (Q.L., T.E.T.); and Department of Chemistry, University of California, Riverside, California (D.B.)
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Liu T, Zhang M, Terry MH, Schroeder H, Wilson SM, Power GG, Li Q, Tipple TE, Borchardt D, Blood AB. Nitrite potentiates the vasodilatory signaling of S-nitrosothiols. Nitric Oxide 2018; 75:60-69. [PMID: 29428841 DOI: 10.1016/j.niox.2018.01.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 12/27/2022]
Abstract
Nitrite and S-nitrosothiols (SNOs) are both byproducts of nitric oxide (NO) metabolism and are proposed to cause vasodilation via activation of soluble guanylate cyclase (sGC). We have previously reported that while SNOs are potent vasodilators at physiological concentrations, nitrite itself only produces vasodilation at supraphysiological concentrations. Here, we tested the hypothesis that sub-vasoactive concentrations of nitrite potentiate the vasodilatory effects of SNOs. Multiple exposures of isolated sheep arteries to S-nitroso-glutathione (GSNO) resulted in a tachyphylactic decreased vasodilatory response to GSNO but not to NO, suggesting attenuation of signaling steps upstream from sGC. Exposure of arteries to 1 μM nitrite potentiated the vasodilatory effects of GSNO in naive arteries and abrogated the tachyphylactic response to GSNO in pre-exposed arteries, suggesting that nitrite facilitates GSNO-mediated activation of sGC. In intact anesthetized sheep and rats, inhibition of NO synthases to decrease plasma nitrite levels attenuated vasodilatory responses to exogenous infusions of GSNO, an effect that was reversed by exogenous infusion of nitrite at sub-vasodilating levels. This study suggests nitrite potentiates SNO-mediated vasodilation via a mechanism that lies upstream from activation of sGC.
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Affiliation(s)
- Taiming Liu
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Meijuan Zhang
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Michael H Terry
- Department of Respiratory Care, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Hobe Schroeder
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Sean M Wilson
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Gordon G Power
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States
| | - Qian Li
- Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Trent E Tipple
- Neonatal Redox Biology Laboratory, Division of Neonatology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
| | - Dan Borchardt
- Department of Chemistry, University of California, Riverside, CA 92521, United States
| | - Arlin B Blood
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States; Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA 92354, United States.
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Barnett SD, Buxton ILO. The role of S-nitrosoglutathione reductase (GSNOR) in human disease and therapy. Crit Rev Biochem Mol Biol 2017; 52:340-354. [PMID: 28393572 PMCID: PMC5597050 DOI: 10.1080/10409238.2017.1304353] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
S-nitrosoglutathione reductase (GSNOR), or ADH5, is an enzyme in the alcohol dehydrogenase (ADH) family. It is unique when compared to other ADH enzymes in that primary short-chain alcohols are not its principle substrate. GSNOR metabolizes S-nitrosoglutathione (GSNO), S-hydroxymethylglutathione (the spontaneous adduct of formaldehyde and glutathione), and some alcohols. GSNOR modulates reactive nitric oxide (•NO) availability in the cell by catalyzing the breakdown of GSNO, and indirectly regulates S-nitrosothiols (RSNOs) through GSNO-mediated protein S-nitrosation. The dysregulation of GSNOR can significantly alter cellular homeostasis, leading to disease. GSNOR plays an important regulatory role in smooth muscle relaxation, immune function, inflammation, neuronal development and cancer progression, among many other processes. In recent years, the therapeutic inhibition of GSNOR has been investigated to treat asthma, cystic fibrosis and interstitial lung disease (ILD). The direct action of •NO on cellular pathways, as well as the important regulatory role of protein S-nitrosation, is closely tied to GSNOR regulation and defines this enzyme as an important therapeutic target.
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Affiliation(s)
- Scott D Barnett
- a Department of Pharmacology , University of Nevada, Reno School of Medicine , Reno , NV , USA
| | - Iain L O Buxton
- a Department of Pharmacology , University of Nevada, Reno School of Medicine , Reno , NV , USA
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