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Nelissen E, Schepers M, Ponsaerts L, Foulquier S, Bronckaers A, Vanmierlo T, Sandner P, Prickaerts J. Soluble guanylyl cyclase: A novel target for the treatment of vascular cognitive impairment? Pharmacol Res 2023; 197:106970. [PMID: 37884069 DOI: 10.1016/j.phrs.2023.106970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 10/16/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
Vascular cognitive impairment (VCI) describes neurodegenerative disorders characterized by a vascular component. Pathologically, it involves decreased cerebral blood flow (CBF), white matter lesions, endothelial dysfunction, and blood-brain barrier (BBB) impairments. Molecularly, oxidative stress and inflammation are two of the major underlying mechanisms. Nitric oxide (NO) physiologically stimulates soluble guanylate cyclase (sGC) to induce cGMP production. However, under pathological conditions, NO seems to be at the basis of oxidative stress and inflammation, leading to a decrease in sGC activity and expression. The native form of sGC needs a ferrous heme group bound in order to be sensitive to NO (Fe(II)sGC). Oxidation of sGC leads to the conversion of ferrous to ferric heme (Fe(III)sGC) and even heme-loss (apo-sGC). Both Fe(III)sGC and apo-sGC are insensitive to NO, and the enzyme is therefore inactive. sGC activity can be enhanced either by targeting the NO-sensitive native sGC (Fe(II)sGC), or the inactive, oxidized sGC (Fe(III)sGC) and the heme-free apo-sGC. For this purpose, sGC stimulators acting on Fe(II)sGC and sGC activators acting on Fe(III)sGC/apo-sGC have been developed. These sGC agonists have shown their efficacy in cardiovascular diseases by restoring the physiological and protective functions of the NO-sGC-cGMP pathway, including the reduction of oxidative stress and inflammation, and improvement of vascular functioning. Yet, only very little research has been performed within the cerebrovascular system and VCI pathology when focusing on sGC modulation and its potential protective mechanisms on vascular and neural function. Therefore, within this review, the potential of sGC as a target for treating VCI is highlighted.
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Affiliation(s)
- Ellis Nelissen
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Universiteitssingel 50, 6229 ER Maastricht, the Netherlands.
| | - Melissa Schepers
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Universiteitssingel 50, 6229 ER Maastricht, the Netherlands; Neuro-immune connect and repair lab, Biomedical Research Institute, Hasselt University, Hasselt 3500, Belgium
| | - Laura Ponsaerts
- Neuro-immune connect and repair lab, Biomedical Research Institute, Hasselt University, Hasselt 3500, Belgium; Department of Cardio & Organ Systems (COS), Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Sébastien Foulquier
- Department of Pharmacology and Toxicology, School for Mental Health and Neuroscience (MHeNS), School for Cardiovascular Diseases (CARIM), Maastricht University, Universiteitssingel 50, 6229 ER Maastricht, the Netherlands
| | - Annelies Bronckaers
- Department of Cardio & Organ Systems (COS), Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Tim Vanmierlo
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Universiteitssingel 50, 6229 ER Maastricht, the Netherlands; Neuro-immune connect and repair lab, Biomedical Research Institute, Hasselt University, Hasselt 3500, Belgium
| | - Peter Sandner
- Bayer AG, Pharmaceuticals R&D, Pharma Research Center, 42113 Wuppertal, Germany; Hannover Medical School, 30625 Hannover, Germany
| | - Jos Prickaerts
- Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Universiteitssingel 50, 6229 ER Maastricht, the Netherlands
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Emerging Therapy for Diabetic Cardiomyopathy: From Molecular Mechanism to Clinical Practice. Biomedicines 2023; 11:biomedicines11030662. [PMID: 36979641 PMCID: PMC10045486 DOI: 10.3390/biomedicines11030662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 02/08/2023] [Accepted: 02/11/2023] [Indexed: 02/24/2023] Open
Abstract
Diabetic cardiomyopathy is characterized by abnormal myocardial structure or performance in the absence of coronary artery disease or significant valvular heart disease in patients with diabetes mellitus. The spectrum of diabetic cardiomyopathy ranges from subtle myocardial changes to myocardial fibrosis and diastolic function and finally to symptomatic heart failure. Except for sodium–glucose transport protein 2 inhibitors and possibly bariatric and metabolic surgery, there is currently no specific treatment for this distinct disease entity in patients with diabetes. The molecular mechanism of diabetic cardiomyopathy includes impaired nutrient-sensing signaling, dysregulated autophagy, impaired mitochondrial energetics, altered fuel utilization, oxidative stress and lipid peroxidation, advanced glycation end-products, inflammation, impaired calcium homeostasis, abnormal endothelial function and nitric oxide production, aberrant epidermal growth factor receptor signaling, the activation of the renin–angiotensin–aldosterone system and sympathetic hyperactivity, and extracellular matrix accumulation and fibrosis. Here, we summarize several important emerging treatments for diabetic cardiomyopathy targeting specific molecular mechanisms, with evidence from preclinical studies and clinical trials.
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Laubrie JD, Bezmalinovic A, García-Herrera CM, Celentano DJ, Herrera EA, Avril S, Llanos AJ. Hyperelastic and damage properties of the hypoxic aorta treated with Cinaciguat. J Biomech 2023; 147:111457. [PMID: 36701962 DOI: 10.1016/j.jbiomech.2023.111457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 12/27/2022] [Accepted: 01/13/2023] [Indexed: 01/18/2023]
Abstract
Chronic hypoxia during gestation and postnatal period induces pulmonary hypertension, aorta stiffening and vascular remodeling. In this study, we hypothesized that a postnatal treatment with Cinaciguat, a guanylate cyclase activator, may improve the vascular function by enhancing NO-sGC pathways that induce vasodilation. To assess this, we collected aortas from six lambs gestated, born and raised at 3600 masl. Half of these lambs received a Cinaciguat postnatal treatment, while the other half was used as control (vehicle). Uniaxial tension was applied on samples of each group of aortas (control and Cinaciguat-treated) through cyclic loading. The obtained stress-stretch curves were used to identify constitutive parameters of a hyperelastic damage model. These material constants allowed us to assess the softening/dissipation behavior and to characterize the treatment effects. Results showed that Cinaciguat has an effect on the damage behavior at large strains, altering the damage onset under uniaxial tension. We conclude that Cinaciguat, as a vasodilator, can prevent the very early effects of vascular remodeling caused by perinatal hypoxia, and improve the aortic-tissue damage properties of hypoxic lambs.
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Affiliation(s)
- Joan D Laubrie
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Santiago de Chile, Santiago, Chile
| | - Alejandro Bezmalinovic
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Santiago de Chile, Santiago, Chile
| | - Claudio M García-Herrera
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Santiago de Chile, Santiago, Chile.
| | - Diego J Celentano
- Departamento de Ingeniería Mecánica y Metalúrgica, Instituto de Ingeniería Biológica y Médica, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Emilio A Herrera
- Programa de Fisiopatología, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile; International Center for Andean Studies (INCAS), Universidad de Chile, Putre, Chile
| | - Stéphane Avril
- Mines Saint-Etienne, Univ Jean Monnet, INSERM, U 1059 Sainbiose, F - 42023 Saint-Etienne, France
| | - Aníbal J Llanos
- Programa de Fisiopatología, Facultad de Medicina, Instituto de Ciencias Biomédicas, Universidad de Chile, Santiago, Chile; International Center for Andean Studies (INCAS), Universidad de Chile, Putre, Chile
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4
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Jiang M, Zhao XM, Jiang ZS, Wang GX, Zhang DW. Protein tyrosine nitration in atherosclerotic endothelial dysfunction. Clin Chim Acta 2022; 529:34-41. [PMID: 35149004 DOI: 10.1016/j.cca.2022.02.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 02/02/2022] [Accepted: 02/07/2022] [Indexed: 11/29/2022]
Abstract
Accumulation of reactive oxygen species (ROS) can induce both protein tyrosine nitration and endothelial dysfunction in atherosclerosis. Endothelial dysfunction refers to impaired endothelium-dependent vasorelaxation that can be triggered by an imbalance in nitric oxide (NO) production and consumption. ROS reacts with NO to generate peroxynitrite, decreasing NO bioavailability. Peroxynitrite also promotes protein tyrosine nitration in vivo that can affect protein structure and function and further damage endothelial function. In this review, we discuss the process of protein tyrosine nitration, increased expression of nitrated proteins in cardiovascular disease and their association with endothelial dysfunction, and the interference of tyrosine nitration with antioxidants and the protective role in endothelial dysfunction. These may lead us to the conception that protein tyrosine nitration may be one of the causes of endothelial dysfunction, and help us gain information about the mechanism of endothelial dysfunction underlying atherosclerosis.
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Affiliation(s)
- Miao Jiang
- Institute of Cardiovascular Disease, Department of Pathophysiology, Key Laboratory for Arteriosclerology of Hunan Province, Hunan International Scientific and Technological Cooperation Base of Arteriosclerotic disease, Postdoctoral Research Station of Basic Medicine, University of South China, Hengyang, 421001, China; Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Bioengineering Collage of Chongqing University, Chongqing, 400030, China
| | - Xiao-Mei Zhao
- College of Public Health, University of South China, Hengyang, 421001, Hunan, China
| | - Zhi-Sheng Jiang
- Institute of Cardiovascular Disease, Department of Pathophysiology, Key Laboratory for Arteriosclerology of Hunan Province, Hunan International Scientific and Technological Cooperation Base of Arteriosclerotic disease, Postdoctoral Research Station of Basic Medicine, University of South China, Hengyang, 421001, China.
| | - Gui-Xue Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Bioengineering Collage of Chongqing University, Chongqing, 400030, China.
| | - Da-Wei Zhang
- Group on the Molecular and Cell Biology of Lipids, Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada
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Korkmaz-Icöz S, Kocer C, Sayour AA, Kraft P, Benker MI, Abulizi S, Georgevici AI, Brlecic P, Radovits T, Loganathan S, Karck M, Szabó G. The Sodium-Glucose Cotransporter-2 Inhibitor Canagliflozin Alleviates Endothelial Dysfunction Following In Vitro Vascular Ischemia/Reperfusion Injury in Rats. Int J Mol Sci 2021; 22:ijms22157774. [PMID: 34360539 PMCID: PMC8345991 DOI: 10.3390/ijms22157774] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 07/15/2021] [Indexed: 01/10/2023] Open
Abstract
Vascular ischemia/reperfusion injury (IRI) contributes to graft failure and adverse clinical outcomes following coronary artery bypass grafting. Sodium-glucose-cotransporter (SGLT)-2-inhibitors have been shown to protect against myocardial IRI, irrespective of diabetes. We hypothesized that adding canagliflozin (CANA) (an SGLT-2-inhibitor) to saline protects vascular grafts from IRI. Aortic rings from non-diabetic rats were isolated and immediately mounted in organ bath chambers (control, n = 9–10 rats) or underwent cold ischemic preservation in saline, supplemented either with a DMSO vehicle (IR, n = 8–10 rats) or 50µM CANA (IR + CANA, n = 9–11 rats). Vascular function was measured, the expression of 88 genes using PCR-array was analyzed, and feature selection using machine learning was applied. Impaired maximal vasorelaxation to acetylcholine in the IR-group compared to controls was significantly ameliorated by CANA (IR 31.7 ± 3.2% vs. IR + CANA 51.9 ± 2.5%, p < 0.05). IR altered the expression of 17 genes. Ccl2, Ccl3, Ccl4, CxCr4, Fos, Icam1, Il10, Il1a and Il1b have been found to have the highest interaction. Compared to controls, IR significantly upregulated the mRNA expressions of Il1a and Il6, which were reduced by 1.5- and 1.75-fold with CANA, respectively. CANA significantly prevented the upregulation of Cd40, downregulated NoxO1 gene expression, decreased ICAM-1 and nitrotyrosine, and increased PECAM-1 immunoreactivity. CANA alleviates endothelial dysfunction following IRI.
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Affiliation(s)
- Sevil Korkmaz-Icöz
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
- Correspondence: ; Tel.: +49-6221-566246; Fax: +49-6221-564571
| | - Cenk Kocer
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Alex A. Sayour
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
- Heart and Vascular Center, Semmelweis University, 1122 Budapest, Hungary;
| | - Patricia Kraft
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Mona I. Benker
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Sophia Abulizi
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Adrian-Iustin Georgevici
- Department of Anesthesiology, St. Josef Hospital, Ruhr-University Bochum, 44791 Bochum, Germany;
| | - Paige Brlecic
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, 1122 Budapest, Hungary;
| | - Sivakkanan Loganathan
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
- Department of Cardiac Surgery, University Hospital Halle (Saale), 06120 Halle, Germany
| | - Matthias Karck
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
| | - Gábor Szabó
- Department of Cardiac Surgery, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.K.); (A.A.S.); (P.K.); (M.I.B.); (S.A.); (P.B.); (S.L.); (M.K.); (G.S.)
- Department of Cardiac Surgery, University Hospital Halle (Saale), 06120 Halle, Germany
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Maturation, inactivation, and recovery mechanisms of soluble guanylyl cyclase. J Biol Chem 2021; 296:100336. [PMID: 33508317 PMCID: PMC7949132 DOI: 10.1016/j.jbc.2021.100336] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/21/2021] [Accepted: 01/22/2021] [Indexed: 11/22/2022] Open
Abstract
Soluble guanylate cyclase (sGC) is a heme-containing heterodimeric enzyme that generates many molecules of cGMP in response to its ligand nitric oxide (NO); sGC thereby acts as an amplifier in NO-driven biological signaling cascades. Because sGC helps regulate the cardiovascular, neuronal, and gastrointestinal systems through its cGMP production, boosting sGC activity and preventing or reversing sGC inactivation are important therapeutic and pharmacologic goals. Work over the last two decades is uncovering the processes by which sGC matures to become functional, how sGC is inactivated, and how sGC is rescued from damage. A diverse group of small molecules and proteins have been implicated in these processes, including NO itself, reactive oxygen species, cellular heme, cell chaperone Hsp90, and various redox enzymes as well as pharmacologic sGC agonists. This review highlights their participation and provides an update on the processes that enable sGC maturation, drive its inactivation, or assist in its recovery in various settings within the cell, in hopes of reaching a better understanding of how sGC function is regulated in health and disease.
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Gantner BN, LaFond KM, Bonini MG. Nitric oxide in cellular adaptation and disease. Redox Biol 2020; 34:101550. [PMID: 32438317 PMCID: PMC7235643 DOI: 10.1016/j.redox.2020.101550] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 02/07/2023] Open
Abstract
Nitric oxide synthases are the major sources of nitric oxide, a critical signaling molecule involved in a wide range of cellular and physiological processes. These enzymes comprise a family of genes that are highly conserved across all eukaryotes. The three family members found in mammals are important for inter- and intra-cellular signaling in tissues that include the nervous system, the vasculature, the gut, skeletal muscle, and the immune system, among others. We summarize major advances in the understanding of biochemical and tissue-specific roles of nitric oxide synthases, with a focus on how these mechanisms enable tissue adaptation and health or dysfunction and disease. We highlight the unique mechanisms and processes of neuronal nitric oxide synthase, or NOS1. This was the first of these enzymes discovered in mammals, and yet much remains to be understood about this highly conserved and complex gene. We provide examples of two areas that will likely be of increasing importance in nitric oxide biology. These include the mechanisms by which these critical enzymes promote adaptation or disease by 1) coordinating communication by diverse cell types within a tissue and 2) directing cellular differentiation/activation decisions processes.
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Affiliation(s)
- Benjamin N Gantner
- Department of Medicine, Division of Endocrinology, Medical College of Wisconsin, USA.
| | - Katy M LaFond
- Department of Medicine, Division of Endocrinology, Medical College of Wisconsin, USA
| | - Marcelo G Bonini
- Department of Medicine, Division of Endocrinology, Medical College of Wisconsin, USA; Feinberg School of Medicine, Division of Hematology and Oncology, Robert H. Lurie Comprehensive Cancer Center, Northwestern University, USA
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Wepler M, Merz T, Wachter U, Vogt J, Calzia E, Scheuerle A, Möller P, Gröger M, Kress S, Fink M, Lukaschewski B, Rumm G, Stahl B, Georgieff M, Huber-Lang M, Torregrossa R, Whiteman M, McCook O, Radermacher P, Hartmann C. The Mitochondria-Targeted H2S-Donor AP39 in a Murine Model of Combined Hemorrhagic Shock and Blunt Chest Trauma. Shock 2019; 52:230-239. [PMID: 29927788 DOI: 10.1097/shk.0000000000001210] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Hemorrhagic shock (HS) accounts for 30% to 40% of trauma-induced mortality, which is due to multi-organ-failure subsequent to systemic hyper-inflammation, triggered by hypoxemia and tissue ischemia. The slow-releasing, mitochondria-targeted H2S donor AP39 exerted beneficial effects in several models of ischemia-reperfusion injury and acute inflammation. Therefore, we tested the effects of AP39-treatment in a murine model of combined blunt chest trauma (TxT) and HS with subsequent resuscitation. METHODS After blast wave-induced TxT or sham procedure, anesthetized and instrumented mice underwent 1 h of hemorrhage followed by 4 h of resuscitation comprising an i.v. bolus injection of 100 or 10 nmol kg AP39 or vehicle, retransfusion of shed blood, fluid resuscitation, and norepinephrine. Lung mechanics and gas exchange were assessed together with hemodynamics, metabolism, and acid-base status. Blood and tissue samples were analyzed for cytokine and chemokine levels, western blot, immunohistochemistry, mitochondrial oxygen consumption (JO2), and histological changes. RESULTS High dose AP39 attenuated systemic inflammation and reduced the expression of inducible nitric oxide synthase (iNOS) and IκBα expression in lung tissue. In the combined trauma group (TxT + HS), animals treated with high dose AP39 presented with the lowest mean arterial pressure and thus highest norepinephrine requirements and higher mortality. Low dose AP39 had no effects on hemodynamics, leading to unchanged norepinephrine requirements and mortality rates. CONCLUSION AP39 is a systemic anti-inflammatory agent. In our model of trauma with HS, there may be a narrow dosing and timing window due to its potent vasodilatory properties, which might result in or contribute to aggravation of circulatory shock-related hypotension.
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Affiliation(s)
- Martin Wepler
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
- Department of Anesthesiology, University Hospital, Ulm, Germany
| | - Tamara Merz
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Ulrich Wachter
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Josef Vogt
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Enrico Calzia
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | | | - Peter Möller
- Institute of Pathology, University Hospital, Ulm, Germany
| | - Michael Gröger
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Sandra Kress
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Marina Fink
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Britta Lukaschewski
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Grégoire Rumm
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Bettina Stahl
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | | | - Markus Huber-Lang
- Institute of Clinical and Experimental Trauma-Immunology, University Hospital, Ulm, Germany
| | | | - Matthew Whiteman
- University of Exeter Medical School, St. Luke's Campus, Exeter, England, UK
| | - Oscar McCook
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Peter Radermacher
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
| | - Clair Hartmann
- Institute of Anesthesiological Pathophysiology and Process Engineering, University Hospital, Ulm, Germany
- Department of Anesthesiology, University Hospital, Ulm, Germany
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Shah RC, Sanker S, Wood KC, Durgin BG, Straub AC. Redox regulation of soluble guanylyl cyclase. Nitric Oxide 2018; 76:97-104. [PMID: 29578056 DOI: 10.1016/j.niox.2018.03.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 02/28/2018] [Accepted: 03/19/2018] [Indexed: 11/15/2022]
Abstract
The nitric oxide/soluble guanylyl cyclase (NO-sGC) signaling pathway regulates the cardiovascular, neuronal, and gastrointestinal systems. Impaired sGC signaling can result in disease and system-wide organ failure. This review seeks to examine the redox control of sGC through heme and cysteine regulation while discussing therapeutic drugs that target various conditions. Heme regulation involves mechanisms of insertion of the heme moiety into the sGC protein, the molecules and proteins that control switching between the oxidized (Fe3+) and reduced states (Fe2+), and the activity of heme degradation. Modifications to cysteine residues by S-nitrosation on the α1 and β1 subunits of sGC have been shown to be important in sGC signaling. Moreover, redox balance and localization of sGC is thought to control downstream effects. In response to altered sGC activity due to changes in the redox state, many therapeutic drugs have been developed to target decreased NO-sGC signaling. The importance and relevance of sGC continues to grow as sGC dysregulation leads to numerous disease conditions.
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Affiliation(s)
- Rohan C Shah
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Subramaniam Sanker
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Katherine C Wood
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Brittany G Durgin
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - Adam C Straub
- Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA, USA.
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10
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Daiber A, Steven S, Weber A, Shuvaev VV, Muzykantov VR, Laher I, Li H, Lamas S, Münzel T. Targeting vascular (endothelial) dysfunction. Br J Pharmacol 2017; 174:1591-1619. [PMID: 27187006 PMCID: PMC5446575 DOI: 10.1111/bph.13517] [Citation(s) in RCA: 304] [Impact Index Per Article: 43.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 04/28/2016] [Accepted: 05/09/2016] [Indexed: 12/18/2022] Open
Abstract
Cardiovascular diseases are major contributors to global deaths and disability-adjusted life years, with hypertension a significant risk factor for all causes of death. The endothelium that lines the inner wall of the vasculature regulates essential haemostatic functions, such as vascular tone, circulation of blood cells, inflammation and platelet activity. Endothelial dysfunction is an early predictor of atherosclerosis and future cardiovascular events. We review the prognostic value of obtaining measurements of endothelial function, the clinical techniques for its determination, the mechanisms leading to endothelial dysfunction and the therapeutic treatment of endothelial dysfunction. Since vascular oxidative stress and inflammation are major determinants of endothelial function, we have also addressed current antioxidant and anti-inflammatory therapies. In the light of recent data that dispute the prognostic value of endothelial function in healthy human cohorts, we also discuss alternative diagnostic parameters such as vascular stiffness index and intima/media thickness ratio. We also suggest that assessing vascular function, including that of smooth muscle and even perivascular adipose tissue, may be an appropriate parameter for clinical investigations. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- Andreas Daiber
- Center of CardiologyMedical Center of the Johannes Gutenberg UniversityMainzGermany
- German Center for Cardiovascular Research (DZHK)Partner Site Rhine‐MainMainzGermany
| | - Sebastian Steven
- Center of CardiologyMedical Center of the Johannes Gutenberg UniversityMainzGermany
- Center of Thrombosis and HemostasisMedical Center of the Johannes Gutenberg UniversityMainzGermany
| | - Alina Weber
- Center of CardiologyMedical Center of the Johannes Gutenberg UniversityMainzGermany
| | - Vladimir V. Shuvaev
- Department of Systems Pharmacology & Translational Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Vladimir R. Muzykantov
- Department of Systems Pharmacology & Translational Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Ismail Laher
- Department of Pharmacology and Therapeutics, Faculty of MedicineUniversity of British ColumbiaVancouverBCCanada
| | - Huige Li
- German Center for Cardiovascular Research (DZHK)Partner Site Rhine‐MainMainzGermany
- Department of PharmacologyMedical Center of the Johannes Gutenberg UniversityMainzGermany
| | - Santiago Lamas
- Department of Cell Biology and ImmunologyCentro de Biología Molecular "Severo Ochoa" (CSIC‐UAM)MadridSpain
| | - Thomas Münzel
- Center of CardiologyMedical Center of the Johannes Gutenberg UniversityMainzGermany
- German Center for Cardiovascular Research (DZHK)Partner Site Rhine‐MainMainzGermany
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11
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Sharina IG, Martin E. The Role of Reactive Oxygen and Nitrogen Species in the Expression and Splicing of Nitric Oxide Receptor. Antioxid Redox Signal 2017; 26:122-136. [PMID: 26972233 PMCID: PMC7061304 DOI: 10.1089/ars.2016.6687] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
SIGNIFICANCE Nitric oxide (NO)-dependent signaling is critical to many cellular functions and physiological processes. Soluble guanylyl cyclase (sGC) acts as an NO receptor and mediates the majority of NO functions. The signaling between NO and sGC is strongly altered by reactive oxygen and nitrogen species. Recent Advances: Besides NO scavenging, sGC is affected by oxidation/loss of sGC heme, oxidation, or nitrosation of cysteine residues and phosphorylation. Apo-sGC or sGC containing oxidized heme is targeted for degradation. sGC transcription and the stability of sGC mRNA are also affected by oxidative stress. CRITICAL ISSUES Studies cited in this review suggest the existence of compensatory processes that adapt cellular processes to diminished sGC function under conditions of short-term or moderate oxidative stress. Alternative splicing of sGC transcripts is discussed as a mechanism with the potential to both enhance and reduce sGC function. The expression of α1 isoform B, a functional and stable splice variant of human α1 sGC subunit, is proposed as one of such compensatory mechanisms. The expression of dysfunctional splice isoforms is discussed as a contributor to decreased sGC function in vascular disease. FUTURE DIRECTIONS Targeting the process of sGC splicing may be an important approach to maintain the composition of sGC transcripts that are expressed in healthy tissues under normal conditions. Emerging new strategies that allow for targeted manipulations of RNA splicing offer opportunities to use this approach as a preventive measure and to control the composition of sGC splice isoforms. Rational management of expressed sGC splice forms may be a valuable complementary treatment strategy for existing sGC-directed therapies. Antioxid. Redox Signal. 26, 122-136.
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Affiliation(s)
- Iraida G Sharina
- 1 Division of Cardiology, Department of Internal Medicine, The University of Texas Health Science Center in Houston Medical School , Houston, Texas
| | - Emil Martin
- 1 Division of Cardiology, Department of Internal Medicine, The University of Texas Health Science Center in Houston Medical School , Houston, Texas.,2 School of Science and Technology, Nazarbayev University , Astana, Kazakhstan
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12
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Loganathan S, Korkmaz-Icöz S, Radovits T, Li S, Mikles B, Barnucz E, Hirschberg K, Karck M, Szabo G. Rolle der löslichen Guanylatzyklase im Modell der Herztransplantation in der Ratte. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2016. [DOI: 10.1007/s00398-016-0093-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Maiti AK, Islam MT, Satou R, Majid DSA. Enhancement in cellular Na+K+ATPase activity by low doses of peroxynitrite in mouse renal tissue and in cultured HK2 cells. Physiol Rep 2016; 4:4/7/e12766. [PMID: 27081160 PMCID: PMC4831332 DOI: 10.14814/phy2.12766] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 03/21/2016] [Indexed: 11/25/2022] Open
Abstract
In the normal condition, endogenous formation of peroxynitrite (ONOOˉ) from the interaction of nitric oxide and superoxide has been suggested to play a renoprotective role. However, the exact mechanism associated with renoprotection by this radical compound is not yet clearly defined. Although ONOOˉ usually inhibits renal tubular Na+K+ATPase (NKA) activity at high concentrations (micromolar to millimolar range [μM–mM], achieved in pathophysiological conditions), the effects at lower concentrations (nanomolar range [nM], relevant in normal condition) remain unknown. To examine the direct effect of ONOOˉ on NKA activity, preparations of cellular membrane fraction from mouse renal tissue and from cultured HK2 cells (human proximal tubular epithelial cell lines) were incubated for 10 and 30 min each with different concentrations of ONOOˉ (10 nmol/L–200 μmol/L). NKA activity in these samples (n = 5 in each case) was measured via a colorimetric assay capable of detecting inorganic phosphate. At high concentrations (1–200 μmol/L), ONOOˉ caused dose‐dependent inhibition of NKA activity (−3.0 ± 0.6% and −36.4 ± 1.4%). However, NKA activity remained unchanged at 100 and 500 nmol/L ONOOˉ concentration, but interestingly, at lower concentrations (10 and 50 nmol/L), ONOOˉ caused small but significant increases in the NKA activity (3.3 ± 1.1% and 3.1 ± 0.6%). Pretreatment with a ONOOˉ scavenger, mercaptoethylguanidine (MEG; 200 μmol/L), prevented these biphasic responses to ONOOˉ. This dose‐dependent biphasic action of ONOO− on NKA activity may implicate that this radical compound helps to maintain sodium homeostasis either by enhancing tubular sodium reabsorption under normal conditions or by inhibiting it during oxidative stress conditions.
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Affiliation(s)
- Arpan K Maiti
- Department of Physiology, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, New Orleans, Louisiana
| | - Mohammed T Islam
- Department of Physiology, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, New Orleans, Louisiana
| | - Ryousuke Satou
- Department of Physiology, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, New Orleans, Louisiana
| | - Dewan S A Majid
- Department of Physiology, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, New Orleans, Louisiana
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14
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Rat aorta as a pharmacological tool for in vitro and in vivo studies. Life Sci 2016; 145:190-204. [DOI: 10.1016/j.lfs.2015.12.043] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Revised: 11/26/2015] [Accepted: 12/24/2015] [Indexed: 11/24/2022]
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15
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Hoffmann LS, Kretschmer A, Lawrenz B, Hocher B, Stasch JP. Chronic Activation of Heme Free Guanylate Cyclase Leads to Renal Protection in Dahl Salt-Sensitive Rats. PLoS One 2015; 10:e0145048. [PMID: 26717150 PMCID: PMC4700984 DOI: 10.1371/journal.pone.0145048] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 11/29/2015] [Indexed: 12/31/2022] Open
Abstract
The nitric oxide (NO)/soluble guanylate cyclase (sGC)/cyclic guanosine monophasphate (cGMP)-signalling pathway is impaired under oxidative stress conditions due to oxidation and subsequent loss of the prosthetic sGC heme group as observed in particular in chronic renal failure. Thus, the pool of heme free sGC is increased under pathological conditions. sGC activators such as cinaciguat selectively activate the heme free form of sGC and target the disease associated enzyme. In this study, a therapeutic effect of long-term activation of heme free sGC by the sGC activator cinaciguat was investigated in an experimental model of salt-sensitive hypertension, a condition that is associated with increased oxidative stress, heme loss from sGC and development of chronic renal failure. For that purpose Dahl/ss rats, which develop severe hypertension upon high salt intake, were fed a high salt diet (8% NaCl) containing either placebo or cinaciguat for 21 weeks. Cinaciguat markedly improved survival and ameliorated the salt-induced increase in blood pressure upon treatment with cinaciguat compared to placebo. Renal function was significantly improved in the cinaciguat group compared to the placebo group as indicated by a significantly improved glomerular filtration rate and reduced urinary protein excretion. This was due to anti-fibrotic and anti-inflammatory effects of the cinaciguat treatment. Taken together, this is the first study showing that long-term activation of heme free sGC leads to renal protection in an experimental model of hypertension and chronic kidney disease. These results underline the promising potential of cinaciguat to treat renal diseases by targeting the disease associated heme free form of sGC.
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Affiliation(s)
- Linda S. Hoffmann
- Pharma Research Centre, Bayer HealthCare, Wuppertal, Germany
- * E-mail:
| | - Axel Kretschmer
- Pharma Research Centre, Bayer HealthCare, Wuppertal, Germany
| | - Bettina Lawrenz
- Pharma Research Centre, Bayer HealthCare, Wuppertal, Germany
| | - Berthold Hocher
- Instute of Nutritional Science, University of Potsdam, Potsdam, Germany, and IFLb Laboratoriumsmedizin Berlin GmbH, Berlin, Germany
| | - Johannes-Peter Stasch
- Pharma Research Centre, Bayer HealthCare, Wuppertal, Germany
- School of Pharmacy, Martin-Luther-University, Halle an der Saale, Germany
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16
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Mátyás C, Németh BT, Oláh A, Hidi L, Birtalan E, Kellermayer D, Ruppert M, Korkmaz-Icöz S, Kökény G, Horváth EM, Szabó G, Merkely B, Radovits T. The soluble guanylate cyclase activator cinaciguat prevents cardiac dysfunction in a rat model of type-1 diabetes mellitus. Cardiovasc Diabetol 2015; 14:145. [PMID: 26520063 PMCID: PMC4628236 DOI: 10.1186/s12933-015-0309-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/24/2015] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Diabetes mellitus (DM) leads to the development of diabetic cardiomyopathy, which is associated with altered nitric oxide (NO)--soluble guanylate cyclase (sGC)--cyclic guanosine monophosphate (cGMP) signalling. Cardioprotective effects of elevated intracellular cGMP-levels have been described in different heart diseases. In the current study we aimed at investigating the effects of pharmacological activation of sGC in diabetic cardiomyopathy. METHODS Type-1 DM was induced in rats by streptozotocin. Animals were treated either with the sGC activator cinaciguat (10 mg/kg/day) or with placebo orally for 8 weeks. Left ventricular (LV) pressure-volume (P-V) analysis was used to assess cardiac performance. Additionally, gene expression (qRT-PCR) and protein expression analysis (western blot) were performed. Cardiac structure, markers of fibrotic remodelling and DNA damage were examined by histology, immunohistochemistry and TUNEL assay, respectively. RESULTS DM was associated with deteriorated cGMP signalling in the myocardium (elevated phosphodiesterase-5 expression, lower cGMP-level and impaired PKG activity). Cardiomyocyte hypertrophy, fibrotic remodelling and DNA fragmentation were present in DM that was associated with impaired LV contractility (preload recruitable stroke work (PRSW): 49.5 ± 3.3 vs. 83.0 ± 5.5 mmHg, P < 0.05) and diastolic function (time constant of LV pressure decay (Tau): 17.3 ± 0.8 vs. 10.3 ± 0.3 ms, P < 0.05). Cinaciguat treatment effectively prevented DM related molecular, histological alterations and significantly improved systolic (PRSW: 66.8 ± 3.6 mmHg) and diastolic (Tau: 14.9 ± 0.6 ms) function. CONCLUSIONS Cinaciguat prevented structural, molecular alterations and improved cardiac performance of the diabetic heart. Pharmacological activation of sGC might represent a new therapy approach for diabetic cardiomyopathy.
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Affiliation(s)
- Csaba Mátyás
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Balázs Tamás Németh
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Attila Oláh
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - László Hidi
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Ede Birtalan
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Dalma Kellermayer
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Mihály Ruppert
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Sevil Korkmaz-Icöz
- Experimental Laboratory of Cardiac Surgery, Department of Cardiac Surgery, University of Heidelberg, INF 326. OG 2, 69120, Heidelberg, Germany.
| | - Gábor Kökény
- Institute of Pathophysiology, Semmelweis University, Nagyvárad tér 4., Budapest, 1089, Hungary.
| | - Eszter Mária Horváth
- Institute of Human Physiology and Clinical Experimental Research, Semmelweis University, Tűzoltó u. 37-47., Budapest, 1094, Hungary.
| | - Gábor Szabó
- Experimental Laboratory of Cardiac Surgery, Department of Cardiac Surgery, University of Heidelberg, INF 326. OG 2, 69120, Heidelberg, Germany.
| | - Béla Merkely
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary.
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Városmajor u. 68., Budapest, 1122, Hungary. .,Experimental Laboratory of Cardiac Surgery, Department of Cardiac Surgery, University of Heidelberg, INF 326. OG 2, 69120, Heidelberg, Germany.
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17
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Loganathan S, Korkmaz-Icöz S, Radovits T, Li S, Mikles B, Barnucz E, Hirschberg K, Karck M, Szabó G. Effects of soluble guanylate cyclase activation on heart transplantation in a rat model. J Heart Lung Transplant 2015. [PMID: 26210750 DOI: 10.1016/j.healun.2015.05.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The nitric oxide (NO)/soluble guanylate cyclase (sGC)/cyclic guanosine monophosphate (cGMP) pathway is an important key mechanism to protect the heart from ischemia/reperfusion injury. However, this pathway is disrupted in several cardiovascular diseases as a result of decreased NO bioavailability and increased NO-insensitive forms of sGC. Cinaciguat preferentially activates these NO-insensitive, oxidized forms of sGC. METHODS We assessed the hypothesis that targeting NO-unresponsive sGC would protect the graft against ischemia/reperfusion injury in a rat heart transplantation model. Before explantation, donor Lewis rats received methylcellulose (1%) vehicle or cinaciguat 10 mg/kg. The hearts were excised, stored in cold preservation solution, and heterotopically transplanted. We evaluated in vivo left ventricular function of the graft. RESULTS After transplantation, decreased left ventricular systolic pressure (77 ± 3 mm Hg vs 123 ± 13 mm Hg, p < 0.05), dP/dt(max) (1,703 ± 162 mm Hg vs 3,350 ± 444 mm Hg, p < 0.05), and dP/dt(min) (995 ± 110 mm Hg vs 1,925 ± 332 mm Hg, p < 0.05) were significantly increased by cinaciguat. Coronary blood flow was significantly higher in the cinaciguat group compared with the control group. Additionally, cinaciguat increased adenosine triphosphate levels (1.9 ± 0.4 µmol/g vs 6.6 ± 0.8 µmol/g, p < 0.05) and improved energy charge potential. After transplantation, increased c-jun messenger RNA expression was downregulated, whereas superoxide dismutase-1 and cytochrome-c oxidase mRNA levels were upregulated by cinaciguat. Cinaciguat also significantly decreased myocardial DNA strand breaks induced by ischemia/reperfusion during transplantation and reduced death of cardiomyocytes in a cellular model of oxidative stress. CONCLUSIONS By interacting with NO-unresponsive sGC, cinaciguat enhances the protective effects of the NO/cGMP pathway at different steps of signal transduction after global myocardial ischemia/reperfusion. Its clinical use as pre-conditioning agent could be a novel approach in cardiac surgery.
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Affiliation(s)
- Sivakkanan Loganathan
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany; Department of Anesthesiology, St. Josef Hospital, Ruhr University Bochum, Bochum, Germany.
| | - Sevil Korkmaz-Icöz
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Tamás Radovits
- Heart and Vascular Center, Semmelweis University, Budapest, Hungary
| | - Shiliang Li
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Beatrice Mikles
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Enikő Barnucz
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Kristóf Hirschberg
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Matthias Karck
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
| | - Gábor Szabó
- Department of Cardiac Surgery, University of Heidelberg, Heidelberg, Germany
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18
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Tawa M, Shimosato T, Iwasaki H, Imamura T, Okamura T. Effects of peroxynitrite on relaxation through the NO/sGC/cGMP pathway in isolated rat iliac arteries. J Vasc Res 2015; 51:439-46. [PMID: 25634663 DOI: 10.1159/000371491] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 12/02/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS The present study investigated the mechanism by which peroxynitrite impairs vascular function through the nitric oxide (NO)/soluble guanylate cyclase (sGC)/cGMP pathway. METHODS Mechanical responses of rat external iliac arteries without endothelium were studied under exposure to peroxynitrite. cGMP concentrations were determined by enzyme immunoassay. RESULTS Relaxation induced by BAY 41-2272 (sGC stimulator) was impaired under exposure to peroxynitrite, whereas that by BAY 60-2770 (sGC activator) was enhanced. These responses were correlated with tissue levels of cGMP. Effects of peroxynitrite on the relaxant responses to BAY compounds were also observed in the presence of superoxide dismutase (SOD) or tempol, both of which scavenge a certain kind of reactive molecules other than peroxynitrite. As is the case with the relaxant response to BAY 41-2272, acidified NaNO2- and nitroglycerin-induced relaxations were markedly attenuated by exposing the arteries to peroxynitrite, which was not abolished by preincubation with SOD or tempol. On the other hand, peroxynitrite exposure had no effect on the 8-Br-cGMP-induced vasorelxation. CONCLUSION These findings suggest that peroxynitrite interferes with the NO/sGC/cGMP pathway by altering the redox state of sGC. It is likely that peroxynitrite can shift the sGC redox equilibrium to the NO-insensitive state in the vasculature.
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Affiliation(s)
- Masashi Tawa
- Department of Pharmacology, Shiga University of Medical Science, Otsu, Japan
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19
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Cosyns SMR, Huyghe L, Thoonen R, Stasch JP, Brouckaert P, Lefebvre RA. Influence of cinaciguat on gastrointestinal motility in apo-sGC mice. Neurogastroenterol Motil 2014; 26:1573-85. [PMID: 25200007 DOI: 10.1111/nmo.12424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 08/12/2014] [Indexed: 12/14/2022]
Abstract
BACKGROUND Cinaciguat (BAY 58-2667), an NO- and heme-independent sGC activator, was shown to be more effective when the heme-group of sGC is oxidized in vascular tissue. In apo-sGC mice (sGCβ1 (His105Phe) knockin) both sGC isoforms (sGCα1 β1 and sGCα2 β1 ) are heme-deficient and can no longer be activated by NO; these mice, showing decreased gastrointestinal nitrergic relaxation and decreased gastric emptying, can be considered as a model to study the consequence of heme-oxidation in sGC. Our aim was to compare the influence of cinaciguat, on in vitro muscle tone of gastrointestinal tissues, and on gastric emptying in WT and apo-sGC mice. METHODS Gastrointestinal smooth muscle strips were mounted in organ baths for isometric force recording and cGMP levels were determined by enzyme immunoassay. Protein levels of sGC subunits were assessed by immunoblotting. Gastric emptying was determined by phenol red recovery. KEY RESULTS Although protein levels of the sGC subunits were lower in gastrointestinal tissues of apo-sGC mice, cinaciguat induced concentration-dependent relaxations and increased cGMP levels in apo-sGC fundus and colon to a similar or greater extent than in WT mice. The sGC inhibitor ODQ increased cinaciguat-induced relaxations and cGMP levels in WT fundus and colon. In apo-sGC antrum, pylorus and jejunum, cinaciguat was not able to induce relaxations. Cinaciguat did not improve delayed gastric emptying in apo-sGC mice. CONCLUSIONS & INFERENCES Cinaciguat relaxes the fundus and colon efficiently when sGC is in the heme-free condition; the non-effect of cinaciguat in pylorus explains its inability to improve the delayed gastric emptying in apo-sGC mice.
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Affiliation(s)
- Sarah M R Cosyns
- Heymans Institute of Pharmacology, Ghent University, Ghent, Belgium
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New insights into the role of soluble guanylate cyclase in blood pressure regulation. Curr Opin Nephrol Hypertens 2014; 23:135-42. [PMID: 24419369 DOI: 10.1097/01.mnh.0000441048.91041.3a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE OF REVIEW Nitric oxide (NO)-soluble guanylate cyclase (sGC)-dependent signaling mechanisms have a profound effect on the regulation of blood pressure (BP). In this review, we will discuss recent findings in the field that support the importance of sGC in the development of hypertension. RECENT FINDINGS The importance of sGC in BP regulation was highlighted by studies using genetically modified animal models, chemical stimulators/activators and inhibitors of the NO/sGC signaling pathway, and genetic association studies in humans. Many studies further support the role of NO/sGC in vasodilation and vascular dysfunction, which is underscored by the early clinical success of synthetic sGC stimulators for the treatment of pulmonary hypertension. Recent work has uncovered more details about the structural basis of sGC activation, enabling the development of more potent and efficient modulators of sGC activity. Finally, the mechanisms involved in the modulation of sGC by signaling gases other than NO, as well as the influence of redox signaling on sGC, have been the subject of several interesting studies. SUMMARY sGC is fast becoming an interesting therapeutic target for the treatment of vascular dysfunction and hypertension, with novel sGC stimulating/activating compounds as promising clinical treatment options.
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Billaud M, Lohman AW, Johnstone SR, Biwer LA, Mutchler S, Isakson BE. Regulation of cellular communication by signaling microdomains in the blood vessel wall. Pharmacol Rev 2014; 66:513-69. [PMID: 24671377 DOI: 10.1124/pr.112.007351] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
It has become increasingly clear that the accumulation of proteins in specific regions of the plasma membrane can facilitate cellular communication. These regions, termed signaling microdomains, are found throughout the blood vessel wall where cellular communication, both within and between cell types, must be tightly regulated to maintain proper vascular function. We will define a cellular signaling microdomain and apply this definition to the plethora of means by which cellular communication has been hypothesized to occur in the blood vessel wall. To that end, we make a case for three broad areas of cellular communication where signaling microdomains could play an important role: 1) paracrine release of free radicals and gaseous molecules such as nitric oxide and reactive oxygen species; 2) role of ion channels including gap junctions and potassium channels, especially those associated with the endothelium-derived hyperpolarization mediated signaling, and lastly, 3) mechanism of exocytosis that has considerable oversight by signaling microdomains, especially those associated with the release of von Willebrand factor. When summed, we believe that it is clear that the organization and regulation of signaling microdomains is an essential component to vessel wall function.
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Affiliation(s)
- Marie Billaud
- Dept. of Molecular Physiology and Biophysics, University of Virginia School of Medicine, PO Box 801394, Charlottesville, VA 22902.
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