1
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Coceani F. Oxygen sensing in the ductus arteriosus-A unifying vision for two concepts. Br J Pharmacol 2022; 179:3325-3329. [PMID: 35302234 DOI: 10.1111/bph.15828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 02/03/2022] [Accepted: 02/16/2022] [Indexed: 11/28/2022] Open
Abstract
Closure of the ductus arteriosus at birth is known to be related to the physiological rise in blood oxygen tension. Two main schemes have been proposed to explain the peculiar contraction of the ductus to oxygen, and their function is based on distinct sensor-effector complexes. Specifically, these schemes comprise a cytochrome P450 monooxygenase-endothelin complex or, alternatively, a mitochondrial redox mechanism-voltage gated potassium channel complex. However, it is not clear how these systems may relate to the closure process. Here, it is proposed that they operate jointly within a single functional entity, with their combined activation being required for a full-fledged contraction of the vessel to oxygen. This arrangement is thought to ensure a smooth transition from the powerful relaxant mechanism that is evident through the early postnatal period. Validation of this concept would not only settle a central question in the operation of the ductus but may also afford a broader perspective in any future translational research.
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Affiliation(s)
- Flavio Coceani
- Institute of Life Sciences, Scuola Superiore Sant'Anna, Pisa, Italy
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2
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Scrivner O, Ismaeel A, Kumar MR, Sorokolet K, Koutakis P, Farmer PJ. Expanding the Reactive Sulfur Metabolome: Intracellular and Efflux Measurements of Small Oxoacids of Sulfur (SOS) and H 2S in Human Primary Vascular Cell Culture. Molecules 2021; 26:7160. [PMID: 34885743 PMCID: PMC8659008 DOI: 10.3390/molecules26237160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 12/29/2022] Open
Abstract
Hydrogen sulfide (H2S) is an endogenous signaling molecule which is important for cardiovascular health, but its mechanism of action remains poorly understood. Here, we report measurements of H2S as well as its oxidized metabolites, termed small oxoacids of sulfur (SOS = HSOH and HOSOH), in four human primary vascular cell lines: smooth muscle and endothelial cells derived from both human arterial and coronary tissues. We use a methodology that targets small molecular weight sulfur species; mass spectrometric analysis allows for species quantification to report cellular concentrations based on an H2S calibration curve. The production of H2S and SOS is orders of magnitude higher in smooth muscle (nanomolar) as compared to endothelial cell lines (picomolar). In all the primary lines measured, the distributions of these three species were HOSOH >H2S > HSOH, with much higher SOS than seen previously in non-vascular cell lines. H2S and SOS were effluxed from smooth muscle cells in higher concentrations than endothelial cells. Aortic smooth muscle cells were used to examine changes under hypoxic growth conditions. Hypoxia caused notable increases in HSOH and ROS, which we attribute to enhanced sulfide quinone oxidase activity that results in reverse electron transport.
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Affiliation(s)
- Ottis Scrivner
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (O.S.); (M.R.K.); (K.S.)
| | - Ahmed Ismaeel
- Department of Biology, Baylor University, Waco, TX 76798, USA; (A.I.); (P.K.)
| | - Murugaeson R. Kumar
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (O.S.); (M.R.K.); (K.S.)
| | - Kristina Sorokolet
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (O.S.); (M.R.K.); (K.S.)
| | - Panagiotis Koutakis
- Department of Biology, Baylor University, Waco, TX 76798, USA; (A.I.); (P.K.)
| | - Patrick J. Farmer
- Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76798, USA; (O.S.); (M.R.K.); (K.S.)
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3
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Olson KR. A Case for Hydrogen Sulfide Metabolism as an Oxygen Sensing Mechanism. Antioxidants (Basel) 2021; 10:antiox10111650. [PMID: 34829521 PMCID: PMC8615108 DOI: 10.3390/antiox10111650] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/08/2021] [Accepted: 10/13/2021] [Indexed: 12/30/2022] Open
Abstract
The ability to detect oxygen availability is a ubiquitous attribute of aerobic organisms. However, the mechanism(s) that transduce oxygen concentration or availability into appropriate physiological responses is less clear and often controversial. This review will make the case for oxygen-dependent metabolism of hydrogen sulfide (H2S) and polysulfides, collectively referred to as reactive sulfur species (RSS) as a physiologically relevant O2 sensing mechanism. This hypothesis is based on observations that H2S and RSS metabolism is inversely correlated with O2 tension, exogenous H2S elicits physiological responses identical to those produced by hypoxia, factors that affect H2S production or catabolism also affect tissue responses to hypoxia, and that RSS efficiently regulate downstream effectors of the hypoxic response in a manner consistent with a decrease in O2. H2S-mediated O2 sensing is then compared to the more generally accepted reactive oxygen species (ROS) mediated O2 sensing mechanism and a number of reasons are offered to resolve some of the confusion between the two.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend, South Bend, IN 46617, USA
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4
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Hallman M, Treluyer JM, Aikio O, Rozé J. Early closure mechanisms of the ductus arteriosus in immature infants. Acta Paediatr 2021; 110:1995-2007. [PMID: 33655615 DOI: 10.1111/apa.15826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/22/2021] [Accepted: 02/26/2021] [Indexed: 12/18/2022]
Abstract
AIM According to experimental studies, cardiopulmonary distress decreases after closure of patent ductus arteriosus. However, early closure of the ductus using ibuprofen or indomethacin has failed to increase survival without serious morbidity. We review relevant data aiming to define optimal early management strategies that promote early closure of ductus arteriosus without serious adverse effects. METHODS Literature in English was searched selectively focusing on the potential of using acetaminophen for early closure of the ductus. RESULTS Prophylactic ibuprofen or indomethacin intended to close the ductus, predisposes infants to ischaemia, bleeding and immune dysfunction. Acetaminophen appears to have a similar efficacy as indomethacin or ibuprofen, and all three dose-dependently constrict the ductus. Ibuprofen and indomethacin cause non-specific inhibition of prostaglandin synthesis, while acetaminophen predominantly inhibits prostaglandin E synthesis. Owing to low CYP450 activity in infancy, acetaminophen toxicity has been rarely evident. However, increasing the dosage increases the oxidative stress. We review prophylactic treatments that may increase the safety and efficacy of acetaminophen. These include vitamin A, cysteine and glutamine, and low-dose corticosteroid supplementation. CONCLUSION The current challenge is to define a safe perinatal management practice that promotes cardiorespiratory adaptation in immature infants, particularly the seamless closure of the ductus before significant cardiopulmonary distress develops.
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Affiliation(s)
- Mikko Hallman
- Department of Pediatrics Oulu University Hospital Oulu Finland
- PEDEGO Research Unit Medical Research Center University of Oulu Oulu Finland
| | - Jean Marc Treluyer
- Faculté de Médecine Université de Paris Paris France
- CIC‐1419 InsermCochin‐Necker Paris France
| | - Outi Aikio
- Department of Pediatrics Oulu University Hospital Oulu Finland
- PEDEGO Research Unit Medical Research Center University of Oulu Oulu Finland
| | - Jean‐Christophe Rozé
- Department of Neonatology Nantes University Hospital Nantes France
- Centre d'Investigation ClinIque CIC1413INSERMNantes University Hospital Nantes France
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5
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Wang JC, Gu J, Li Y, Ma Q, Feng J, Lu S. Transforming growth factor-β1 and inducible nitric oxide synthase signaling were involved in effects of prostaglandin E 2 on progression of lower limb varicose veins. J Vasc Surg Venous Lymphat Disord 2021; 9:1535-1544. [PMID: 33482378 DOI: 10.1016/j.jvsv.2020.12.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 12/23/2020] [Indexed: 10/22/2022]
Abstract
OBJECTIVE The vital pathogenesis of varicose veins includes remodeling of the extracellular matrix and decreased vascular tone. Prostaglandin E2 (PGE2), a small molecule substance and inflammatory medium that belongs to the arachidonic acid derivatives, has the capacity to influence the expression of metalloproteinase and the vascular tone of the venous wall. The purpose of the present study was to investigate the role of PGE2 in the development of varicose veins in lower limbs. METHODS The collected venous specimens were analyzed using hematoxylin and eosin, Masson's trichrome, and immunohistochemical staining. Transforming growth factor (TGF)-β1, PGE2, CD31, and α-smooth muscle actin antibody were used to detect the expression and distribution of these proteins. The effect of PGE2 on the proliferation, migration, and tube formation capacity of human umbilical vein endothelial cells (HUVECs) was detected in vitro. The effect of TGF-β1 on the expression of PGE2 and matrix metalloproteinases (MMPs) was assessed using Western blotting. Quantitative reverse transcription polymerase chain reaction was used to evaluate the effect of PGE2 on the expression of nitric oxide synthase (NOS) and other genes. RESULTS The expression of PGE2 and TGF-β1 in varicose veins was upregulated in the media tunica and intima tunica, and a strong positive correlation was found between PGE2 and TGF-β1 expression in both varicose veins (95% confidence interval, 0.5207-0.9582; R = 0.848; P = .0005) and normal veins (95% confidence interval, 0.2530-0.8532; R = 0.643; P = .003). PGE2 promoted the migration and tube formation ability of HUVECs. Moreover, PGE2 also upregulated the expression of MMP-1 and TGF-β1 in HUVECs and increased the mRNA level of inducible NOS. CONCLUSIONS PGE2 can affect the remodeling of the extracellular matrix and reduce the elasticity of the vascular walls by promoting the synthesis of TGF-β1 and MMP-1. PGE2 can also reduce the tension of the great saphenous vein by promoting the expression of inducible NOS, thus aggravating the blood stasis.
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Affiliation(s)
- Ji-Chang Wang
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Jingtao Gu
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Yan Li
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Qiang Ma
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Jun Feng
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Shaoying Lu
- Department of Vascular Surgery, First Affiliated Hospital of Xi'an, Jiaotong University, Xi'an, Shaanxi, People's Republic of China.
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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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7
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Understanding the pathobiology in patent ductus arteriosus in prematurity-beyond prostaglandins and oxygen. Pediatr Res 2019; 86:28-38. [PMID: 30965358 DOI: 10.1038/s41390-019-0387-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 03/05/2019] [Accepted: 03/27/2019] [Indexed: 12/14/2022]
Abstract
The ductus arteriosus (DA) is probably the most intriguing vessel in postnatal hemodynamic transition. DA patency in utero is an active state, in which prostaglandin E2 (PGE2) and nitric monoxide (NO), play an important role. Since the DA gets programmed for postnatal closure as gestation advances, in preterm infants the DA frequently remains patent (PDA). PGE2 exposure programs functional postnatal closure by inducing gene expression of ion channels and phosphodiesterases and anatomical closure by inducing intimal thickening. Postnatally, oxygen inhibits potassium and activates calcium channels, which ultimately leads to a rise in intracellular calcium concentration consequently inducing phosphorylation of the myosin light chain and thereby vasoconstriction of the DA. Since ion channel expression is lower in preterm infants, oxygen induced functional vasoconstriction is attenuated in comparison with full term newborns. Furthermore, the preterm DA is more sensitive to both PGE2 and NO compared to the term DA pushing the balance toward less constriction. In this review we explain the physiology of DA patency in utero and subsequent postnatal functional closure. We will focus on the pathobiology of PDA in preterm infants and the (un)intended effect of antenatal exposure to medication on both fetal and neonatal DA vascular tone.
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8
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Dyson RM, Palliser HK, Wilding N, Kelly MA, Chwatko G, Glowacki R, Berry MJ, Ni X, Wright IMR. Microvascular circulatory dysregulation driven in part by cystathionine gamma-lyase: A new paradigm for cardiovascular compromise in the preterm newborn. Microcirculation 2018; 26:e12507. [PMID: 30276964 DOI: 10.1111/micc.12507] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 09/24/2018] [Accepted: 09/27/2018] [Indexed: 11/28/2022]
Abstract
OBJECTIVE H2 S may explain the dysregulation of microvascular tone associated with poor outcome following preterm birth. In adult vasculature, H2 S is predominantly produced by CSE. We hypothesized that vascular CSE activity contributes to microvascular tone regulation during circulatory transition. METHODS Preterm (GA62) and full-term (GA69) guinea pig fetuses and neonates were studied. Microvascular blood flow was assessed by laser Doppler flowmetry. Thiosulfate, primary urinary metabolite of H2 S, was determined by high-performance liquid chromatography. Real-time H2 S production was assessed using a microrespiration system in fetal and postnatal (10, 24 hours) skin and heart samples. CSE contribution was investigated by inhibition via propargylglycine. RESULTS In preterm animals, postnatal H2 S production capacity in peripheral vasculature increased significantly and was significantly reduced by the inhibition of CSE. Urinary thiosulfate correlated with both microvascular blood flow and capacity of the vasculature to produce H2 S. H2 S produced via CSE did not correlate directly with microvascular blood flow. CONCLUSIONS In preterm neonates, H2 S production increases during fetal-to-neonatal transition and CSE contribution to total H2 S increases postnatally. CSE-dependent mechanisms may therefore underpin the increase in H2 S production over the first 72 hours of life in preterm human neonates, associated with both central and peripheral cardiovascular instability.
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Affiliation(s)
- Rebecca M Dyson
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales, Australia.,Department of Paediatrics and Child Health Research, Graduate Medicine, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia.,Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia.,Discipline of Paediatrics and Child Health, School of Medicine and Public Health, University of Newcastle, Callaghan, New South Wales, Australia.,Department of Paediatrics and Child Health, University of Otago Wellington, Wellington, New Zealand
| | - Hannah K Palliser
- Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia.,School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, New South Wales, Australia
| | - Nicole Wilding
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales, Australia.,Department of Paediatrics and Child Health Research, Graduate Medicine, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia
| | - Megan A Kelly
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales, Australia.,Department of Paediatrics and Child Health Research, Graduate Medicine, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia.,School of Biological Sciences, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia
| | - Grazyna Chwatko
- Department of Environmental Chemistry, Faculty of Chemistry, University of Lodz, Lodz, Poland
| | - Rafal Glowacki
- Department of Environmental Chemistry, Faculty of Chemistry, University of Lodz, Lodz, Poland
| | - Mary J Berry
- Department of Paediatrics and Child Health, University of Otago Wellington, Wellington, New Zealand
| | - Xin Ni
- Department of Physiology, Second Military Medical University, Shanghai, China
| | - Ian M R Wright
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales, Australia.,Department of Paediatrics and Child Health Research, Graduate Medicine, Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, New South Wales, Australia.,Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia.,Discipline of Paediatrics and Child Health, School of Medicine and Public Health, University of Newcastle, Callaghan, New South Wales, Australia
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Hung YC, Yeh JL, Hsu JH. Molecular Mechanisms for Regulating Postnatal Ductus Arteriosus Closure. Int J Mol Sci 2018; 19:ijms19071861. [PMID: 29941785 PMCID: PMC6073350 DOI: 10.3390/ijms19071861] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 05/30/2018] [Accepted: 06/20/2018] [Indexed: 12/25/2022] Open
Abstract
The ductus arteriosus (DA) connects the main pulmonary artery and the aorta in fetal circulation and closes spontaneously within days after birth in normal infants. Abnormal patent DA (PDA) causes morbidities and mortality, especially in preterm infants. Closure of the DA is a complex interactive process involving two events: functional and anatomic closure. Functional closure by smooth muscle contraction was achieved through the regulatory factors of vaso-reactivity. These factors include oxygen sensing system, glutamate, osmolality, prostaglandin E2, nitric oxide, and carbon monoxide. Anatomic closure by vascular remodeling involved several vascular components including endothelium, extracellular matrix, smooth muscle cells, and intraluminal blood cells. Despite advances in understanding of PDA pathogenesis, the molecular mechanism for regulation of DA closure is complex and not fully understood. In this article we review recent evidence regarding the molecular mechanisms of DA closure.
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Affiliation(s)
- Yu-Chi Hung
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Pediatrics, St. Joseph Hospital, Kaohsiung 807, Taiwan.
| | - Jwu-Lai Yeh
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan.
- Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
| | - Jong-Hau Hsu
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Department of Pediatrics, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
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10
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Caprnda M, Qaradakhi T, Hart JL, Kobyliak N, Opatrilova R, Kruzliak P, Zulli A. H 2S causes contraction and relaxation of major arteries of the rabbit. Biomed Pharmacother 2017; 89:56-60. [PMID: 28214688 DOI: 10.1016/j.biopha.2017.01.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 01/05/2017] [Accepted: 01/09/2017] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVE Cardiovascular disease (CVD) caused by atherosclerosis remains a worldwide burden. Hydrogen sulfide is a promising new therapeutic avenue for the treatment of CVD, however reports show exogenous H2S has both vasodilator and vasoconstrictor effects depending on organ examined, and in vitro studies in animal models which are not resistant to developing atherosclerosis are limited. We sought to determine if rabbit arteries constricted or dilated to hydrogen sulfide. MATERIAL AND METHODS The aorta, carotid, renal and iliac arteries were harvested from New Zealand White rabbits (n=4) and subjected to a concentration response curve to the fast H2S releaser NaHS. In addition, a bolus dose of NaHS was used to determine if further dilation was achievable after maximum dilation to acetylcholine similar to nitric oxide donors. Further, NaHS was used to determine if H2S could impair homocysteine induced endothelial dysfunction. RESULTS Blood vessels relaxed poorly to NaHS and contracted at higher doses. A bolus dose of NaHS relaxed then contracted the aorta, however a bolus dose of NaHS after maximal relaxation to acetylcholine caused marked contraction. NaHS did not prevent homocysteine induced vascular dysfunction. CONCLUSION NaHS at low doses caused minor relaxation of rabbit blood vessels, indicating a possible therapeutic benefit for low dose H2S in the cellular milieu.
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Affiliation(s)
- Martin Caprnda
- 2nd Department of Internal Medicine, Faculty of Medicine, Comenius University and University Hospital, Bratislava, Slovakia
| | - Tawar Qaradakhi
- The Centre for Chronic Disease, College of Health & Biomedicine, Victoria University, Melbourne, Werribee Campus, Victoria, Australia
| | - Joanne L Hart
- School of Health and Biomedical Sciences, RMIT University, Bundoora West, Victoria, Australia
| | - Nazarii Kobyliak
- Department of Endocrinology, Bogomolets National Medical University, Kyiv, Ukraine
| | - Radka Opatrilova
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Brno, Czechia
| | - Peter Kruzliak
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Brno, Czechia.
| | - Anthony Zulli
- The Centre for Chronic Disease, College of Health & Biomedicine, Victoria University, Melbourne, Werribee Campus, Victoria, Australia
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11
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Kanagy NL, Szabo C, Papapetropoulos A. Vascular biology of hydrogen sulfide. Am J Physiol Cell Physiol 2017; 312:C537-C549. [PMID: 28148499 DOI: 10.1152/ajpcell.00329.2016] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 01/24/2017] [Accepted: 01/27/2017] [Indexed: 12/23/2022]
Abstract
Hydrogen sulfide (H2S) is a ubiquitous signaling molecule with important functions in many mammalian organs and systems. Observations in the 1990s ascribed physiological actions to H2S in the nervous system, proposing that this gasotransmitter acts as a neuromodulator. Soon after that, the vasodilating properties of H2S were demonstrated. In the past decade, H2S was shown to exert a multitude of physiological effects in the vessel wall. H2S is produced by vascular cells and exhibits antioxidant, antiapoptotic, anti-inflammatory, and vasoactive properties. In this concise review, we have focused on the impact of H2S on vascular structure and function with an emphasis on angiogenesis, vascular tone, vascular permeability and atherosclerosis. H2S reduces arterial blood pressure, limits atheromatous plaque formation, and promotes vascularization of ischemic tissues. Although the beneficial properties of H2S are well established, mechanistic insights into the molecular pathways implicated in disease prevention and treatment remain largely unexplored. Unraveling the targets and downstream effectors of H2S in the vessel wall in the context of disease will aid in translation of preclinical observations. In addition, acute regulation of H2S production is still poorly understood and additional work delineating the pathways regulating the enzymes that produce H2S will allow pharmacological manipulation of this pathway. As the field continues to grow, we expect that H2S-related compounds will find their way into clinical trials for diseases affecting the blood vessels.
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Affiliation(s)
- Nancy L Kanagy
- Vascular Physiology Group, Department of Cell Biology and Physiology, School of Medicine, University of New Mexico, Albuquerque, New Mexico
| | - Csaba Szabo
- Department of Anesthesiology, University of Texas Medical Branch, Galveston, Texas
| | - Andreas Papapetropoulos
- Laboratory of Pharmacology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Athens, Greece; and .,Center of Clinical, Experimental Surgery and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
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12
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Abstract
The central nervous system (CNS) in concert with the heart and vasculature is essential to maintaining cardiovascular (CV) homeostasis. In recent years, our understanding of CNS control of blood pressure regulation (and dysregulation leading to hypertension) has evolved substantially to include (i) the actions of signaling molecules that are not classically viewed as CV signaling molecules, some of which exert effects at CNS targets in a non-traditional manner, and (ii) CNS locations not traditionally viewed as central autonomic cardiovascular centers. This review summarizes recent work implicating immune signals and reproductive hormones, as well as gasotransmitters and reactive oxygen species in the pathogenesis of hypertension at traditional CV control centers. Additionally, recent work implicating non-conventional CNS structures in CV regulation is discussed.
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Affiliation(s)
- Pauline M Smith
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L3N6, Canada
| | - Alastair V Ferguson
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L3N6, Canada
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13
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Duan XC, Liu SY, Guo R, Xiao L, Xue HM, Guo Q, Jin S, Wu YM. Cystathionine-β-Synthase Gene Transfer Into Rostral Ventrolateral Medulla Exacerbates Hypertension via Nitric Oxide in Spontaneously Hypertensive Rats. Am J Hypertens 2015; 28:1106-13. [PMID: 25628417 DOI: 10.1093/ajh/hpu299] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 12/17/2014] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Rostral ventrolateral medulla (RVLM) plays a crucial role in the central regulation of cardiovascular functions. Cystathionine-β-synthase (CBS) is a major hydrogen sulfide (H2S)-generating enzyme that has been identified mainly in the brain. The present study was designed to examine CBS expression and determine its roles and mechanisms of regulating sympathetic outflow and blood pressure (BP) in the RVLM in spontaneously hypertensive rats (SHR). METHODS AND RESULTS CBS expression was decreased in the RVLM in SHR compared to Wistar-Kyoto (WKY) rats. Accumulating evidences suggest that H2S interacts with nitric oxide (NO) to regulate cardiovascular function. Therefore, we hypothesize that the decrease in CBS expression in the RVLM may be involved in the disorder of l-arginine/NO pathway, which subsequently affects BP in SHR. Overexpression of CBS in the RVLM caused significant increases in BP, heart rate, and urinary norepinephrine excretion in SHR but not in WKY. Acute experiments were carried out at day 7 after gene transfer. NO metabolite levels, neuronal NO synthase, and γ-amino butyric acid were decreased in SHR after CBS gene transfer. Furthermore, pressor responses to microinjection of NG-monomethyl-l-arginine into RVLM were blunt in SHR transfected with AdCBS compared to SHR transfected with AdEGFP. CONCLUSIONS Overexpression of CBS in the RVLM elicits enhanced pressor responses in SHR, but not in WKY, and the NO system is involved in these effects. The results suggest that alterations of H2S signaling in the brain may be associated with the development of hypertension.
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Affiliation(s)
- Xiao-Cui Duan
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China; Hebei Key Lab of Laboratory Animal Science, Department of Laboratory Animal Science, Hebei Medical University, Shijiazhuang, China
| | - Shang-Yu Liu
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Rong Guo
- Department of Education Administration, Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Lin Xiao
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Hong-Mei Xue
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Qi Guo
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Sheng Jin
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Yu-Ming Wu
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China;
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14
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Huang S, Li H, Ge J. A cardioprotective insight of the cystathionine γ-lyase/hydrogen sulfide pathway. IJC HEART & VASCULATURE 2015; 7:51-57. [PMID: 28785645 PMCID: PMC5497180 DOI: 10.1016/j.ijcha.2015.01.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Revised: 11/29/2014] [Accepted: 01/20/2015] [Indexed: 11/29/2022]
Abstract
Traditionally, hydrogen sulfide (H2S) was simply considered as a toxic and foul smelling gas, but recently H2S been brought into the spot light of cardiovascular research and development. Since the 1990s, H2S has been mounting evidence of physiological properties such as immune modification, vascular relaxation, attenuation of oxidative stress, inflammatory mitigation, and angiogenesis. H2S has since been recognized as the third physiological gaseous signaling molecule, along with CO and NO [65,66]. H2S is produced endogenously through several key enzymes, including cystathionine β-lyase (CBE), cystathionine γ-lyase (CSE), and 3-mercaptopyruvate sulfurtransferase (MST)/cysteine aminotransferase (CAT). These specific enzymes are expressed accordingly in various organ systems and CSE is the predominant H2S-producing enzyme in the cardiovascular system. The cystathionine γ-lyase (CSE)/H2S pathway has demonstrated various cardioprotective effects, including anti-atherosclerosis, anti-hypertension, pro-angiogenesis, and attenuation of myocardial ischemia-reperfusion injury. CSE exhibits its anti-atherosclerotic effect through 3 mechanisms, namely reduction of chemotactic factor inter cellular adhesion molecule-1 (ICAM-1) and CX3CR1, inhibition of macrophage lipid uptake, and induction of smooth muscle cell apoptosis via MAPK pathway. The CSE/H2S pathway's anti-hypertensive properties are demonstrated via aortic vasodilation through several mechanisms, including the direct stimulation of KATP channels of vascular smooth muscle cells (VSMCs), induction of MAPK pathway, and reduction of homocysteine buildup. Also, CSE/H2S pathway plays an important role in angiogenesis, particularly in increased endothelial cell growth and migration, and in increased vascular network length. In myocardial ischemia-reperfusion injuries, CSE/H2S pathway has shown a clear cardioprotective effect by preserving mitochondria function, increasing antioxidant production, and decreasing infarction injury size. However, CSE/H2S pathway's role in inflammation mitigation is still clouded, due to both pro and anti-inflammatory results presented in the literature, depending on the concentration and form of H2S used in specific experiment models.
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Key Words
- Akt, protein kinase B
- Angiogenesis
- Atherosclerosis
- BCA, brachiocephalic artery
- CAM, chorioallantoic membrane
- CAT, cysteine aminotransferase
- CBS, cystathionine β-lyase
- CLP, cecal ligation and puncture
- CSE KO, CSE knock out
- CSE, cystathionine γ-lyase
- CTO, chronic total occlusion
- CX3CL1, chemokine (C-X3-C Motif) ligand 1
- CX3CR1, CX3C chemokine receptor 1
- Cystathionine γ-lyase
- EC, endothelial cell
- ERK, extracellular signal-regulated kinase
- GAPDH, glyceraldehyde 3-phosphate dehydrogenase
- GSH-Px, glutathione peroxidase
- GYY4137, morpholin-4-Ium-4-methoxyphenyl(morpholino) phosphinodithioate
- H2S, hydrogen sulfide
- HUVECs, human umbilical vein endothelial cells
- Hydrogen sulfide
- ICAM-1, inter cellular adhesion molecule-1
- IMT, intima–media complex thickness
- Ischemia–reperfusion injury
- LPS, lipopolysaccharide
- MAPK, mitogen-activated protein kinase
- MPO, myeloperoxidase
- MST, 3-mercaptopyruvate sulfurtransferase
- NF-κB, nuclear factor kappa-light-chain-enhancer of activated B cells
- Nrf2, nuclear factor erythroid 2-related factor 2
- PAG, DL-propagylglycine
- PPAR-γ, peroxisome proliferator-activated receptor
- PTPN1, protein tyrosine phosphatase, non-receptor type 1
- ROS, reactive oxygen species
- S-diclofenac, 2-[(2,6-dichlorophenyl)amino]benzeneacetic acid 4-(3H-1,2-dithiole-3-thione-5-Yl)-phenyl ester
- SAH, S-adenosylhomocysteine
- SAM, S-adenosylmethionine
- SMCs, smooth muscle cells
- SOD, superoxide dismutase
- VEGF, vascular endothelial growth factor
- VSMCs, vascular smooth muscle cells
- Vasorelaxation
- l-NAME, NG-nitro-l-arginine methyl ester
- oxLDL, oxidized low density lipoprotein
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Affiliation(s)
- Steve Huang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Hua Li
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Departments of Physiology and Medicine/CVRL, UCLA School of Medicine, Los Angeles, CA 90095, USA
| | - Junbo Ge
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital, Fudan University, Shanghai 200032, China
- Institutes of Biomedical Sciences, Fudan University, Shanghai 200032, China
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15
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Abstract
SIGNIFICANCE Although oxygen (O2)-sensing cells and tissues have been known for decades, the identity of the O2-sensing mechanism has remained elusive. Evidence is accumulating that O2-dependent metabolism of hydrogen sulfide (H2S) is this enigmatic O2 sensor. RECENT ADVANCES The elucidation of biochemical pathways involved in H2S synthesis and metabolism have shown that reciprocal H2S/O2 interactions have been inexorably linked throughout eukaryotic evolution; there are multiple foci by which O2 controls H2S inactivation, and the effects of H2S on downstream signaling events are consistent with those activated by hypoxia. H2S-mediated O2 sensing has been demonstrated in a variety of O2-sensing tissues in vertebrate cardiovascular and respiratory systems, including smooth muscle in systemic and respiratory blood vessels and airways, carotid body, adrenal medulla, and other peripheral as well as central chemoreceptors. CRITICAL ISSUES Information is now needed on the intracellular location and stoichometry of these signaling processes and how and which downstream effectors are activated by H2S and its metabolites. FUTURE DIRECTIONS Development of specific inhibitors of H2S metabolism and effector activation as well as cellular organelle-targeted compounds that release H2S in a time- or environmentally controlled way will not only enhance our understanding of this signaling process but also provide direction for future therapeutic applications.
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Affiliation(s)
- Kenneth R Olson
- Department of Physiology, Indiana University School of Medicine-South Bend , South Bend, India na
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16
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Duan XC, Guo R, Liu SY, Xiao L, Xue HM, Guo Q, Jin S, Wu YM. Gene transfer of cystathionine β-synthase into RVLM increases hydrogen sulfide-mediated suppression of sympathetic outflow via KATP channel in normotensive rats. Am J Physiol Heart Circ Physiol 2015; 308:H603-11. [PMID: 25599573 DOI: 10.1152/ajpheart.00693.2014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hydrogen sulfide has been shown to have a sympathoinhibitory effect in the rostral ventrolateral medulla (RVLM). The present study examined the function of cystathionine β-synthase (CBS)/hydrogen sulfide system in the RVLM, which plays a crucial role in the control of blood pressure and sympathetic nerve activity. Adenovirus vectors encoding CBS (AdCBS) or enhanced green fluorescent protein (AdEGFP) were transfected into the RVLM in normotensive rats. Identical microinjection of AdCBS into the RVLM had no effect on systolic blood pressure and heart rate (HR) in conscious rats. Acute experiments were performed at day 7 after gene transfer in anesthetized rats. Microinjection of the CBS inhibitors hydroxylamine (HA) or amino-oxyacetate into the RVLM produced an increase in the renal sympathetic nerve activity (RSNA), mean arterial pressure (MAP), and HR. There was a potentiation of the increases in RSNA, MAP, and HR because of the CBS inhibitors in AdCBS-injected rats compared with AdEGFP-injected rats. Pretreatment with pinacidil, a ATP-sensitive potassium (KATP) channel activator, abolished the effects of HA in two groups. Microinjection of glibenclamide, a KATP channel blocker, produced increases in RSNA, MAP, and HR in AdCBS-injected rats. No changes in behavior were observed in AdEGFP-injected rats. Furthermore, Western blot analysis indicated an increase in the expression of sulfonylurea receptor 2 and inward rectifier K(+) 6.1 in AdCBS-injected rats. These results suggest that the increase in KATP channels in the RVLM may be responsible for the greater sympathetic outflow and pressor effect of HA in AdCBS-injected rats compared with AdEGFP-injected rats.
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Affiliation(s)
- Xiao-cui Duan
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China; Hebei Key Lab of Laboratory Animal Science, Department of Laboratory Animal Science, Hebei Medical University, Shijiazhuang, China; and
| | - Rong Guo
- Dean's Office of the Third Hospital of Hebei Medical University, Shijiazhuang, China
| | - Shang-yu Liu
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Lin Xiao
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Hong-mei Xue
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Qi Guo
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Sheng Jin
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China
| | - Yu-ming Wu
- Department of Physiology, Institute of Basic Medicine, Hebei Medical University, Shijiazhuang, China;
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17
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Abstract
The physiological and biomedical importance of hydrogen sulfide (H2S) has been fully recognized in the cardiovascular system as well as in the rest of the body. In blood vessels, cystathionine γ-lyase (CSE) is a major H2S-producing enzyme expressed in both smooth muscle and endothelium as well as periadventitial adipose tissues. Regulation of H2S production from CSE is controlled by a complex integration of transcriptional, posttranscriptional, and posttranslational mechanisms in blood vessels. In smooth muscle cells, H2S regulates cell apoptosis, phenotypic switch, relaxation and contraction, and calcification. In endothelial cells, H2S controls cell proliferation, cellular senescence, oxidative stress, inflammation, etc. H2S interacts with nitric oxide and acts as an endothelium-derived relaxing factor and an endothelium-derived hyperpolarizing factor. H2S generated from periadventitial adipose tissues acts as an adipocyte-derived relaxing factor and modulates the vascular tone. Extensive evidence has demonstrated the beneficial roles of the CSE/H2S system in various blood vessel diseases, such as hypertension, atherosclerosis, and aortic aneurysm. The important roles signaling in the cardiovascular system merit further intensive and extensive investigation. H2S-releasing agents and CSE activators will find their great applications in the prevention and treatment of blood vessel-related disorders.
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Affiliation(s)
- Guangdong Yang
- Cardiovascular and Metabolic Research Unit, Lakehead University, Thunder Bay, ON, Canada
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18
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Whiteman M, Perry A, Zhou Z, Bucci M, Papapetropoulos A, Cirino G, Wood ME. Phosphinodithioate and Phosphoramidodithioate Hydrogen Sulfide Donors. Handb Exp Pharmacol 2015; 230:337-363. [PMID: 26162843 DOI: 10.1007/978-3-319-18144-8_17] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Hydrogen sulfide is rapidly emerging as a key physiological mediator and potential therapeutic tool in numerous areas such as acute and chronic inflammation, neurodegenerative and cardiovascular disease, diabetes, obesity and cancer. However, the vast majority of the published studies have employed crude sulfide salts such as sodium hydrosulfide (NaSH) and sodium sulfide (Na2S) as H2S "donors" to generate H2S. Although these salts are cheap, readily available and easy to use, H2S generated from them occurs as an instantaneous and pH-dependent dissociation, whereas endogenous H2S synthesis from the enzymes cystathionine γ-lyase, cystathionine-β-synthase and 3-mercaptopyruvate sulfurtransferase is a slow and sustained process. Furthermore, sulfide salts are frequently used at concentrations (e.g. 100 μM to 10 mM) far in excess of the levels of H2S reported in vivo (nM to low μM). For the therapeutic potential of H2S is to be properly harnessed, pharmacological agents which generate H2S in a physiological manner and deliver physiologically relevant concentrations are needed. The phosphorodithioate GYY4137 has been proposed as "slow-release" H2S donors and has shown promising efficacy in cellular and animal model diseases such as hypertension, sepsis, atherosclerosis, neonatal lung injury and cancer. However, H2S generation from GYY4137 is inefficient necessitating its use at high concentrations/doses. However, structural modification of the phosphorodithioate core has led to compounds (e.g. AP67 and AP105) with accelerated rates of H2S generation and enhanced biological activity. In this review, the therapeutic potential and limitations of GYY4137 and related phosphorodithioate derivatives are discussed.
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19
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Hydrogen sulfide and endothelium-dependent vasorelaxation. Molecules 2014; 19:21183-99. [PMID: 25521118 PMCID: PMC6271169 DOI: 10.3390/molecules191221183] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 12/09/2014] [Accepted: 12/09/2014] [Indexed: 12/20/2022] Open
Abstract
In addition to nitric oxide and carbon monoxide, hydrogen sulfide (H2S), synthesized enzymatically from l-cysteine or l-homocysteine, is the third gasotransmitter in mammals. Endogenous H2S is involved in the regulation of many physiological processes, including vascular tone. Although initially it was suggested that in the vascular wall H2S is synthesized only by smooth muscle cells and relaxes them by activating ATP-sensitive potassium channels, more recent studies indicate that H2S is synthesized in endothelial cells as well. Endothelial H2S production is stimulated by many factors, including acetylcholine, shear stress, adipose tissue hormone leptin, estrogens and plant flavonoids. In some vascular preparations H2S plays a role of endothelium-derived hyperpolarizing factor by activating small and intermediate-conductance calcium-activated potassium channels. Endothelial H2S signaling is up-regulated in some pathologies, such as obesity and cerebral ischemia-reperfusion. In addition, H2S activates endothelial NO synthase and inhibits cGMP degradation by phosphodiesterase 5 thus potentiating the effect of NO-cGMP pathway. Moreover, H2S-derived polysulfides directly activate protein kinase G. Finally, H2S interacts with NO to form nitroxyl (HNO)-a potent vasorelaxant. H2S appears to play an important and multidimensional role in endothelium-dependent vasorelaxation.
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20
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Yu XH, Cui LB, Wu K, Zheng XL, Cayabyab FS, Chen ZW, Tang CK. Hydrogen sulfide as a potent cardiovascular protective agent. Clin Chim Acta 2014; 437:78-87. [DOI: 10.1016/j.cca.2014.07.012] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 07/07/2014] [Accepted: 07/10/2014] [Indexed: 11/28/2022]
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21
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A role for H2S in the microcirculation of newborns: the major metabolite of H2S (thiosulphate) is increased in preterm infants. PLoS One 2014; 9:e105085. [PMID: 25121737 PMCID: PMC4133363 DOI: 10.1371/journal.pone.0105085] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2014] [Accepted: 07/20/2014] [Indexed: 11/19/2022] Open
Abstract
Excessive vasodilatation during the perinatal period is associated with cardiorespiratory instability in preterm neonates. Little evidence of the mechanisms controlling microvascular tone during circulatory transition exists. We hypothesised that hydrogen sulphide (H2S), an important regulator of microvascular reactivity and central cardiac function in adults and animal models, may contribute to the vasodilatation observed in preterm newborns. Term and preterm neonates (24–43 weeks gestational age) were studied. Peripheral microvascular blood flow was assessed by laser Doppler. Thiosulphate, a urinary metabolite of H2S, was determined by high performance liquid chromatography as a measure of 24 hr total body H2S turnover for the first 3 days of postnatal life. H2S turnover was greatest in very preterm infants and decreased with increasing gestational age (p = 0.0001). H2S turnover was stable across the first 72 hrs of life in older neonates. In very preterm neonates, H2S turnover increased significantly from day 1 to 3 (p = 0.0001); and males had higher H2S turnover than females (p = 0.04). A significant relationship between microvascular blood flow and H2S turnover was observed on day 2 of postnatal life (p = 0.0004). H2S may play a role in maintaining microvascular tone in the perinatal period. Neonates at the greatest risk of microvascular dysfunction characterised by inappropriate peripheral vasodilatation - very preterm male neonates - are also the neonates with highest levels of total body H2S turnover suggesting that overproduction of this gasotransmitter may contribute to microvascular dysfunction in preterms. Potentially, H2S is a target to selectively control microvascular tone in the circulation of newborns.
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22
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Yetik-Anacak G, Sorrentino R, Linder AE, Murat N. Gas what: NO is not the only answer to sexual function. Br J Pharmacol 2014; 172:1434-54. [PMID: 24661203 DOI: 10.1111/bph.12700] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/18/2014] [Accepted: 03/17/2014] [Indexed: 01/08/2023] Open
Abstract
The ability to get and keep an erection is important to men for several reasons and the inability is known as erectile dysfunction (ED). ED has started to be accepted as an early indicator of systemic endothelial dysfunction and subsequently of cardiovascular diseases. The role of NO in endothelial relaxation and erectile function is well accepted. The discovery of NO as a small signalling gasotransmitter led to the investigation of the role of other endogenously derived gases, carbon monoxide (CO) and hydrogen sulphide (H2 S) in physiological and pathophysiological conditions. The role of NO and CO in sexual function and dysfunction has been investigated more extensively and, recently, the involvement of H2 S in erectile function has also been confirmed. In this review, we focus on the role of these three sister gasotransmitters in the physiology, pharmacology and pathophysiology of sexual function in man, specifically erectile function. We have also reviewed the role of soluble guanylyl cyclase/cGMP pathway as a common target of these gasotransmitters. Several studies have proposed alternative therapies targeting different mechanisms in addition to PDE-5 inhibition for ED treatment, since some patients do not respond to these drugs. This review highlights complementary and possible coordinated roles for these mediators and treatments targeting these gasotransmitters in erectile function/ED.
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Affiliation(s)
- G Yetik-Anacak
- Department of Pharmacology, Faculty of Pharmacy, Ege University, İzmir, Turkey
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23
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Leptin-induced endothelium-dependent vasorelaxation of peripheral arteries in lean and obese rats: role of nitric oxide and hydrogen sulfide. PLoS One 2014; 9:e86744. [PMID: 24475175 PMCID: PMC3901689 DOI: 10.1371/journal.pone.0086744] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 12/14/2013] [Indexed: 11/19/2022] Open
Abstract
Adipose tissue hormone leptin induces endothelium-dependent vasorelaxation mediated by nitric oxide (NO) and endothelium-derived hyperpolarizing factors (EDHF). Previously it has been demonstrated that in short-term obesity the NO-dependent and the EDHF-dependent components of vascular effect of leptin are impaired and up-regulated, respectively. Herein we examined the mechanism of the EDHF-dependent vasodilatory effect of leptin and tested the hypothesis that alterations of acute vascular effects of leptin in obesity are accounted for by chronic hyperleptinemia. The study was performed in 5 groups of rats: (1) control, (2) treated with exogenous leptin for 1 week to induce hyperleptinemia, (3) obese, fed highly-palatable diet for 4 weeks, (4) obese treated with pegylated superactive rat leptin receptor antagonist (PEG-SRLA) for 1 week, (5) fed standard chow and treated with PEG-SRLA. Acute effect of leptin on isometric tension of mesenteric artery segments was measured ex vivo. Leptin relaxed phenylephrine-preconstricted vascular segments in NO- and EDHF-dependent manner. The NO-dependent component was impaired and the EDHF-dependent component was increased in the leptin-treated and obese groups and in the latter group both these effects were abolished by PEG-SRLA. The EDHF-dependent vasodilatory effect of leptin was blocked by either the inhibitor of cystathionine γ-lyase, propargylglycine, or a hydrogen sulfide (H2S) scavenger, bismuth (III) subsalicylate. The results indicate that NO deficiency is compensated by the up-regulation of EDHF in obese rats and both effects are accounted for by chronic hyperleptinemia. The EDHF-dependent component of leptin-induced vasorelaxation is mediated, at least partially, by H2S.
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