1
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Bentley RET, Hindmarch CCT, Archer SL. Using omics to breathe new life into our understanding of the ductus arteriosus oxygen response. Semin Perinatol 2023; 47:151715. [PMID: 36906478 DOI: 10.1016/j.semperi.2023.151715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
Abstract
The ductus arteriosus (DA) connects the aorta to the pulmonary artery (PA), directing placentally oxygenated blood away from the developing lungs. High pulmonary vascular resistance and low systemic vascular resistance facilitate shunting of blood in utero from the pulmonary to the systemic circulation through the widely patent DA, thereby optimizing fetal oxygen (O2) delivery. With the transition from fetal (hypoxia) to neonatal (normoxia) oxygen conditions, the DA constricts while the PA dilates. This process often fails in prematurity, promoting congenital heart disease. Impaired O2-responsivness in the DA promotes persistent ductus arteriosus (PDA), the most common form of congenital heart disease. Knowledge of DA oxygen sensing has greatly advanced in the past few decades, however we still lack a complete understanding of the sensing mechanism. The genomic revolution of the past two decades has facilitated unprecedented discovery in every biological system. This review will demonstrate how multiomic integration of data generated from the DA can breathe new life into our understanding of the DA's oxygen response.
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Affiliation(s)
| | - Charles C T Hindmarch
- QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada; Department of Medicine, Queen's University, Kingston, Ontario, Canada
| | - Stephen L Archer
- QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada; Department of Medicine, Queen's University, Kingston, Ontario, Canada.
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2
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Radiologic Evaluation of Portosystemic Shunts in Humans and Small Animals: Review of the Literature with Clinical Case Reports. Diagnostics (Basel) 2023; 13:diagnostics13030482. [PMID: 36766586 PMCID: PMC9914644 DOI: 10.3390/diagnostics13030482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/05/2023] [Accepted: 01/26/2023] [Indexed: 01/31/2023] Open
Abstract
The portal venous system is a network of vessels that carry blood from the capillary beds of the major abdominal organs to the liver. During embryology, the portal venous system can develop aberrantly, leading to vascular connections between the portal and systemic venous circulation known as portosystemic shunts. The purpose of this comparative review with a few short representative case reports was to present the similarities and differences in portosystemic shunts in humans and small animals and their radiologic evaluation. Aberrant vascular connections between the portal and systemic venous circulation enable portal blood to bypass metabolism and detoxification in the liver, leading to significant clinical implications. Portosystemic shunts are very rare in humans, but these connections are much more common in small animals, affecting up to 0.6% of small animals. Portosystemic shunts can be congenital or acquired and are divided into intrahepatic and extrahepatic types. Because of its ability to accurately assess abdominal structures, large vessels, and their flow dynamics without anesthesia, ultrasonography has become the first imaging modality employed for the diagnostic evaluation of portosystemic shunts in both humans and small animals. This is usually followed by contrast-enhanced computed tomographic angiography in order to better define the exact shunt anatomy and to plan treatment. It is important to understand the embryology, anatomy, pathology, and pathophysiology of portosystemic shunts in order to understand the findings of radiologic imaging and to initiate appropriate treatment.
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3
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Owen JC, Garrick SP, Peterson BM, Berger PJ, Nold MF, Sehgal A, Nold-Petry CA. The role of interleukin-1 in perinatal inflammation and its impact on transitional circulation. Front Pediatr 2023; 11:1130013. [PMID: 36994431 PMCID: PMC10040554 DOI: 10.3389/fped.2023.1130013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 02/13/2023] [Indexed: 03/31/2023] Open
Abstract
Preterm birth is defined as delivery at <37 weeks of gestational age (GA) and exposes 15 million infants worldwide to serious early life diseases. Lowering the age of viability to 22 weeks GA entailed provision of intensive care to a greater number of extremely premature infants. Moreover, improved survival, especially at extremes of prematurity, comes with a rising incidence of early life diseases with short- and long-term sequelae. The transition from fetal to neonatal circulation is a substantial and complex physiologic adaptation, which normally happens rapidly and in an orderly sequence. Maternal chorioamnionitis or fetal growth restriction (FGR) are two common causes of preterm birth that are associated with impaired circulatory transition. Among many cytokines contributing to the pathogenesis of chorioamnionitis-related perinatal inflammatory diseases, the potent pro-inflammatory interleukin (IL)-1 has been shown to play a central role. The effects of utero-placental insufficiency-related FGR and in-utero hypoxia may also be mediated, in part, via the inflammatory cascade. In preclinical studies, blocking such inflammation, early and effectively, holds great promise for improving the transition of circulation. In this mini-review, we outline the mechanistic pathways leading to abnormalities in transitional circulation in chorioamnionitis and FGR. In addition, we explore the therapeutic potential of targeting IL-1 and its influence on perinatal transition in the context of chorioamnionitis and FGR.
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Affiliation(s)
- Josephine C. Owen
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Steven P. Garrick
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Briana M. Peterson
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Philip J. Berger
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Marcel F. Nold
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
| | - Arvind Sehgal
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, VIC, Australia
| | - Claudia A. Nold-Petry
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- Correspondence: Claudia A. Nold-Petry
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4
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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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5
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Yarboro MT, Gopal SH, Su RL, Morgan TM, Reese J. Mouse models of patent ductus arteriosus (PDA) and their relevance for human PDA. Dev Dyn 2022; 251:424-443. [PMID: 34350653 PMCID: PMC8814064 DOI: 10.1002/dvdy.408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/16/2021] [Accepted: 07/27/2021] [Indexed: 12/15/2022] Open
Abstract
The ductus arteriosus (DA) is a unique fetal vascular shunt, which allows blood to bypass the developing lungs in utero. After birth, changes in complex signaling pathways lead to constriction and permanent closure of the DA. The persistent patency of the DA (PDA) is a common disorder in preterm infants, yet the underlying causes of PDA are not fully defined. Although limits on the availability of human DA tissues prevent comprehensive studies on the mechanisms of DA function, mouse models have been developed that reveal critical pathways in DA regulation. Over 20 different transgenic models of PDA in mice have been described, with implications for human DA biology. Similarly, we enumerate 224 human single-gene syndromes that are associated with PDA, including a small subset that consistently feature PDA as a prominent phenotype. Comparison and functional analyses of these genes provide insight into DA development and identify key regulatory pathways that may serve as potential therapeutic targets for the management of PDA.
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Affiliation(s)
- Michael T Yarboro
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, USA
| | - Srirupa H Gopal
- Department of Pediatrics, Erlanger Health System, Chattanooga, Tennessee, USA
| | - Rachel L Su
- Division of Neonatology, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Thomas M Morgan
- Division of Medical Genetics and Genomic Medicine, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Jeff Reese
- Department of Cell and Developmental Biology, Vanderbilt University, Nashville, Tennessee, USA.,Division of Neonatology, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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6
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Bentley RET, Hindmarch CCT, Dunham-Snary KJ, Snetsinger B, Mewburn JD, Thébaud A, Lima PDA, Thébaud B, Archer SL. The molecular mechanisms of oxygen-sensing in human ductus arteriosus smooth muscle cells: A comprehensive transcriptome profile reveals a central role for mitochondria. Genomics 2021; 113:3128-3140. [PMID: 34245829 PMCID: PMC10659099 DOI: 10.1016/j.ygeno.2021.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/23/2021] [Accepted: 07/04/2021] [Indexed: 01/22/2023]
Abstract
The ductus arteriosus (DA) connects the fetal pulmonary artery and aorta, diverting placentally oxygenated blood from the developing lungs to the systemic circulation. The DA constricts in response to increases in oxygen (O2) with the first breaths, resulting in functional DA closure, with anatomic closure occurring within the first days of life. Failure of DA closure results in persistent patent ductus arteriosus (PDA), a common complication of extreme preterm birth. The DA's response to O2, though modulated by the endothelium, is intrinsic to the DA smooth muscle cells (DASMC). DA constriction is mediated by mitochondrial-derived reactive oxygen species, which increase in proportion to arterial partial pressure of oxygen (PaO2). The resulting redox changes inhibit voltage-gated potassium channels (Kv) leading to cell depolarization, calcium influx and DASMC constriction. To date, there has not been an unbiased assessment of the human DA O2-sensors using transcriptomics, nor are there known molecular mechanisms which characterize DA closure. DASMCs were isolated from DAs obtained from 10 term infants at the time of congenital heart surgery. Cells were purified by flow cytometry, negatively sorting using CD90 and CD31 to eliminate fibroblasts or endothelial cells, respectively. The purity of the DASMC population was confirmed by positive staining for α-smooth muscle actin, smoothelin B and caldesmon. Cells were grown for 96 h in hypoxia (2.5% O2) or normoxia (19% O2) and confocal imaging with Cal-520 was used to determine oxygen responsiveness. An oxygen-induced increase in intracellular calcium of 18.1% ± 4.4% and SMC constriction (-27% ± 1.5% shortening) occurred in all cell lines within five minutes. RNA sequencing of the cells grown in hypoxia and normoxia revealed significant regulation of 1344 genes (corrected p < 0.05). We examined these genes using Gene Ontology (GO). This unbiased assessment of altered gene expression indicated significant enrichment of the following GOterms: mitochondria, cellular respiration and transcription. The top regulated biologic process was generation of precursor metabolites and energy. The top regulated cellular component was mitochondrial matrix. The top regulated molecular function was transcription coactivator activity. Multiple members of the NADH-ubiquinone oxidoreductase (NDUF) family are upregulated in human DASMC (hDASMC) following normoxia. Several of our differentially regulated transcripts are encoded by genes that have been associated with genetic syndromes that have an increased incidence of PDA (Crebb binding protein and Histone Acetyltransferase P300). This first examination of the effects of O2 on human DA transcriptomics supports a putative role for mitochondria as oxygen sensors.
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Affiliation(s)
| | - Charles C T Hindmarch
- Department of Medicine, Queen's University, Kingston, Ontario, Canada; QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada
| | - Kimberly J Dunham-Snary
- Department of Medicine, Queen's University, Kingston, Ontario, Canada; Department of Biomedical and Molecular Science, Queen's University, Canada
| | - Brooke Snetsinger
- QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada
| | - Jeffrey D Mewburn
- Department of Biomedical and Molecular Science, Queen's University, Canada
| | - Arthur Thébaud
- Department of Kinesiology and Health Studies, Queen's University, Canada
| | - Patricia D A Lima
- QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada
| | - Bernard Thébaud
- Ottawa Hospital Research Institute, Regenerative Medicine Program, Ottawa, Ontario, Canada; Department of Pediatrics, Division of Neonatology, Children's Hospital of Eastern Ontario, Ottawa, Ontario, Canada; Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Ontario, Canada; Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Stephen L Archer
- Department of Medicine, Queen's University, Kingston, Ontario, Canada; QCPU, Queen's Cardiopulmonary Unit, Translational Institute of Medicine (TIME), Department of Medicine, Queen's University, Canada.
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Hitzerd E, Neuman RI, Broekhuizen M, Simons SHP, Schoenmakers S, Reiss IKM, Koch BCP, van den Meiracker AH, Versmissen J, Visser W, Danser AHJ. Transfer and Vascular Effect of Endothelin Receptor Antagonists in the Human Placenta. Hypertension 2019; 75:877-884. [PMID: 31884859 DOI: 10.1161/hypertensionaha.119.14183] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Increasing evidence suggests a role for the ET (endothelin) system in preeclampsia. Hence, blocking this system with endothelin receptor antagonists (ERAs) could be a therapeutic strategy. Yet, clinical studies are lacking due to possible teratogenic effects of ERAs. In this study, we investigated the placental transfer of ERAs and their effect on ET-1-mediated vasoconstriction. Term placentas were dually perfused with the selective ETAR (ET type A receptor) antagonists sitaxentan and ambrisentan or the nonselective ETAR/ETBR antagonist macitentan and subsequently exposed to ET-1 in the fetal circulation. ET-1 concentration-response curves after incubation with sitaxentan, ambrisentan, macitentan, or the selective ETBR antagonist BQ-788 were also constructed in isolated chorionic plate arteries using wire-myography, and gene expression of the ET-system was quantified in healthy and early onset preeclamptic placentas. At steady state, the mean fetal-to-maternal transfer ratios were 0.32±0.05 for sitaxentan, 0.21±0.02 for ambrisentan, and 0.05±0.01 for macitentan. Except for BQ-788, all ERAs lowered the response to ET-1, both in the perfused cotyledon and isolated chorionic plate arteries. Placental gene expression of ECE-1, ETAR, and ETBR were comparable in healthy and preeclamptic placentas, while ET-1 expression was higher in preeclampsia. Our study is the first to show direct transfer of ERAs across the term human placenta. Furthermore, ETAR exclusively mediates ET-1-induced constriction in the fetoplacental vasculature. Given its limited transfer, macitentan could be considered as potential preeclampsia therapy. Extending knowledge on placental transfer to placentas of preeclamptic pregnancies is required to determine whether ERAs might be applied safely in preeclampsia.
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Affiliation(s)
- Emilie Hitzerd
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Pediatrics, division of Neonatology (E.H., M.B., S.H.P.S., I.K.M.R.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Rugina I Neuman
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Obstetrics and Gynecology, Division of Obstetrics and Prenatal Medicine (R.I.N., S.S., W.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Michelle Broekhuizen
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Pediatrics, division of Neonatology (E.H., M.B., S.H.P.S., I.K.M.R.), Erasmus MC University Medical Center, Rotterdam, the Netherlands.,Department of Cardiology, Division of Experimental Cardiology (M.B.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Sinno H P Simons
- Department of Pediatrics, division of Neonatology (E.H., M.B., S.H.P.S., I.K.M.R.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Sam Schoenmakers
- Department of Obstetrics and Gynecology, Division of Obstetrics and Prenatal Medicine (R.I.N., S.S., W.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Irwin K M Reiss
- Department of Pediatrics, division of Neonatology (E.H., M.B., S.H.P.S., I.K.M.R.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Birgit C P Koch
- Department of Pharmacy (B.C.P.K.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Anton H van den Meiracker
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Jorie Versmissen
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Willy Visser
- Department of Obstetrics and Gynecology, Division of Obstetrics and Prenatal Medicine (R.I.N., S.S., W.V.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - A H Jan Danser
- From the Department of Internal Medicine, Division of Pharmacology and Vascular Medicine (E.H., R.I.N., M.B., A.H.v.d.M., J.V., A.H.J.D.), Erasmus MC University Medical Center, Rotterdam, the Netherlands
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8
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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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9
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Endothelin receptor antagonism during preeclampsia: a matter of timing? Clin Sci (Lond) 2019; 133:1341-1352. [PMID: 31221823 DOI: 10.1042/cs20190464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/06/2019] [Accepted: 06/12/2019] [Indexed: 02/07/2023]
Abstract
Preeclampsia (PE) is a pregnancy complication, featuring elevated blood pressure and proteinuria, with no appropriate treatment. Activation of the endothelin system has emerged as an important pathway in PE pathophysiology based on experimental PE models where endothelin receptor antagonists (ERAs) prevented or attenuated hypertension and proteinuria. Hence, ERAs have been suggested as potential therapy for PE. However, developmental toxicity studies in animals have shown severe teratogenic effects of ERAs, particularly craniofacial malformations. Nonetheless, sporadic cases of pregnancy in women using ERAs to treat pulmonary hypertension have been described. In this review we give an overview of cases describing ERA use in pregnancy and critically address their possible teratogenic effects. A systematic search in literature yielded 18 articles describing 39 cases with ERA exposure during human pregnancy. In most cases there was only exposure in the first trimester, but exposure later or throughout pregnancy was reported in five cases. Elective termination of pregnancy was performed in 12 pregnancies (31%), two ended in a spontaneous miscarriage (5%) and no fetal congenital abnormalities have been described in the remaining cases. These preliminary findings support the idea that ERA treatment for severe, early onset PE might be an option if applied later in pregnancy, when organogenesis is completed to avoid teratogenic risks. However, third trimester toxicology studies are warranted to evaluate drug safety. Subsequently, it remains to be established whether ERA treatment is effective for alleviating maternal symptoms, as demonstrated in preclinical PE models, allowing pregnancy prolongation without leading to adverse neonatal outcomes.
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10
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Abstract
The ductus arteriosus is typically viewed as a mammalian fetal blood vessel providing a right-to-left shunt of right ventricular outflow away from the lungs and to the systemic circuit, that must close at birth. This review provides a wider comparative examination of the ductus arteriosus in lungfish, reptiles, birds, and mammals. The ductus arteriosus evolved with the lung in the ancestors of the lungfish as a connection between the pulmonary arteries and dorsal aorta. During embryonic development, reptiles, birds, and mammals all possess either one or two paired ductus arteriosi that provide a fetal shunt of blood away from the lungs. Differences in the fetal circulatory arrangement are seen between these groups and this influences the importance of the ductus arteriosus as an embryonic shunt. The ductus arteriosus from lungfish and tetrapod vertebrates is an oxygen sensitive blood vessel, with shared conserved pathways involved in oxygen sensing. By expanding studies into more comparative models such as lungfish or developing birds a better understanding of the physiology of the ductus arteriosus can be developed.
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Affiliation(s)
- Edward M Dzialowski
- Developmental Integrative Biology Research Group, Department of Biological Science, University of North Texas, 1155 Union Circle #305220, Denton, TX 76203.
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11
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Van den Bossche L, van Steenbeek F. Canine congenital portosystemic shunts: Disconnections dissected. Vet J 2016; 211:14-20. [DOI: 10.1016/j.tvjl.2015.09.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 09/28/2015] [Accepted: 09/29/2015] [Indexed: 10/22/2022]
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12
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Isobaric Tags for Relative and Absolute Quantitation–Based Proteomic Analysis of Patent and Constricted Ductus Arteriosus Tissues Confirms the Systemic Regulation of Ductus Arteriosus Closure. J Cardiovasc Pharmacol 2015; 66:204-13. [DOI: 10.1097/fjc.0000000000000266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Kibel A, Novak S, Cosic A, Mihaljevic Z, Falck JR, Drenjancevic I. Hyperbaric oxygenation modulates vascular reactivity to angiotensin-(1-7) in diabetic rats: potential role of epoxyeicosatrienoic acids. Diab Vasc Dis Res 2015; 12:33-45. [PMID: 25326234 DOI: 10.1177/1479164114553424] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Previously, a facilitating effect of hyperbaric oxygenation (HBO₂) on aortic ring responses to angiotensin-(1-7) in healthy rats was reported, with epoxyeicosatrienoic acids (EETs) possibly playing an important role. The aim of this study was to assess whether HBO₂ exerts similar effects in diabetic rats and to further explore the role of specific cytochrome P450 (CYP) enzymes in changes induced by HBO₂. Aortic relaxation to angiotensin-(1-7) was significantly higher in HBO₂ diabetic rats compared to control diabetic rats, while HBO₂ had no effect on angiotensin II contraction. N-methylsulphonyl-6-(2-propargyloxyphenyl/hexanamide inhibited the facilitation of angiotensin-(1-7) responses in HBO₂ rats, suggesting an important role of EETs in this modulation. mRNA expression of CYP2J3 and protein expression of CYP2C11 were significantly upregulated in HBO₂ diabetic rats, whereas CYP4A1, CYP4A2 and CYP4A3 mRNA and CYP2J3 protein expression was similar between groups. Mean arterial pressure, ferric reducing ability of plasma and Thiobarbituric Acid Reactive Substances levels and serum angiotensin-(1-7) concentrations were not significantly changed.
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MESH Headings
- 8,11,14-Eicosatrienoic Acid/analogs & derivatives
- 8,11,14-Eicosatrienoic Acid/metabolism
- Amides/pharmacology
- Angiotensin I/blood
- Angiotensin I/pharmacology
- Angiotensin II/pharmacology
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/physiopathology
- Aryl Hydrocarbon Hydroxylases/antagonists & inhibitors
- Aryl Hydrocarbon Hydroxylases/genetics
- Aryl Hydrocarbon Hydroxylases/metabolism
- Cytochrome P-450 Enzyme System/chemistry
- Cytochrome P-450 Enzyme System/genetics
- Cytochrome P-450 Enzyme System/metabolism
- Cytochrome P450 Family 2
- Diabetes Mellitus, Type 1/complications
- Diabetes Mellitus, Type 1/metabolism
- Diabetes Mellitus, Type 1/physiopathology
- Diabetes Mellitus, Type 1/therapy
- Diabetic Angiopathies/prevention & control
- Enzyme Induction
- Enzyme Inhibitors/pharmacology
- Hyperbaric Oxygenation/adverse effects
- Male
- Oxidative Stress
- Peptide Fragments/blood
- Peptide Fragments/pharmacology
- Rats, Sprague-Dawley
- Steroid 16-alpha-Hydroxylase/antagonists & inhibitors
- Steroid 16-alpha-Hydroxylase/genetics
- Steroid 16-alpha-Hydroxylase/metabolism
- Vascular Resistance/drug effects
- Vasoconstriction/drug effects
- Vasodilation/drug effects
- Vasodilator Agents/blood
- Vasodilator Agents/pharmacology
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Affiliation(s)
| | - Sanja Novak
- Faculty of Medicine, University of Osijek, Osijek, Croatia
| | - Anita Cosic
- Faculty of Medicine, University of Osijek, Osijek, Croatia
| | | | - John R Falck
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX, USA
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14
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Zielinsky P, Busato S. Prenatal effects of maternal consumption of polyphenol-rich foods in late pregnancy upon fetal ductus arteriosus. ACTA ACUST UNITED AC 2014; 99:256-74. [PMID: 24339037 PMCID: PMC4065350 DOI: 10.1002/bdrc.21051] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 10/24/2013] [Indexed: 12/13/2022]
Abstract
Fetal circulation has characteristic features, being morphologically and functionally different from extrauterine circulation. The ductus arteriosus plays a fundamental role in directing the blood flow to fetal inferior body parts. Basically, the ductus arteriosus directs 80-85% of the right ventricular output arising from the superior vena cava, coronary sinus, and a small part from the inferior vena cava to descending aorta. Its histological structure is made up predominantly by a thick muscular layer, differently from the aorta and the pulmonary artery, which increases with gestational age. The fibers have a circumferential orientation, especially at the external layers, facilitating and making effective ductal constriction. These factors may generate lumen alterations which may cause fetal and neonatal complications, such as heart failure, hydrops, neonatal pulmonary hypertension, and even death. Classically, maternal administration of indomethacin and/or other antiinflammatory drugs interfere in prostaglandins metabolism, causing ductal constriction. However, many cases of fetal ductal constriction, as well as of persistent neonatal pulmonary artery hypertension, remain without an established etiology, being referred as "idiopathic." In recent years, a growing body of evidence has shown that herbs, fruits, nuts, and a wide diversity of substances commonly used in daily diets have definitive effects upon the metabolic pathway of inflammation, with consequent inhibition of prostaglandins synthesis. This antiinflammatory action, especially of polyphenols, when ingested during the third trimester of pregnancy, may influence the dynamics of fetal ductus arteriosus flow. The goal of this review is to present these new observations and findings, which may influence dietary orientation during pregnancy.
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Affiliation(s)
- Paulo Zielinsky
- are from the Fetal Cardiology Unit, Institute of Cardiology, Porto Alegre, Brazil
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15
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Paradis A, Zhang L. Role of endothelin in uteroplacental circulation and fetal vascular function. Curr Vasc Pharmacol 2014; 11:594-605. [PMID: 24063378 DOI: 10.2174/1570161111311050004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 05/10/2012] [Accepted: 07/12/2012] [Indexed: 01/01/2023]
Abstract
Endothelins are 21-amino acid peptides involved in vascular homeostasis. Three types of peptide have been identified, with endothelin-1 (ET-1) being the most potent vasoconstrictor currently known. Two endothelin receptor subtypes are found in various tissues, including the brain, heart, blood vessel, lung, and placenta. The ETA-receptor is associated with vasoconstriction in vascular smooth muscle. Conversely, the ETB-receptor can elicit a vasoconstrictor effect in vascular smooth muscle and a vasodilator effect via its action in endothelial cells. Both receptors play a key role in maintaining circulatory homeostasis and vascular function. Changes in ET-1 expression are found in various disease states, and overexpression of ET-1 is observed in hypertension and preeclampsia in pregnancy. Placental localization of ET-1 implies a key role in regulating the uteroplacental circulation. Additionally, ET-1 is important in the fetal circulation and is involved in the pulmonary circulation and closure of the ductus arteriosus after birth, as well as fetal growth constriction in utero. ET receptor antagonists and nitric oxide donors may provide therapeutic potential in treating conditions associated with overexpression of ET and hypertension.
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Affiliation(s)
- Alexandra Paradis
- Center for Perinatal Biology, Division of Pharmacology, Department of Basic Sciences, Loma Linda University, School of Medicine, Loma Linda, CA 92350, USA.
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16
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Pagni E, Baragatti B, Scebba F, Coceani F. Functional closure of the ductus arteriosus at birth: evidence against an intermediary role of angiotensin II. Pharmacology 2014; 93:120-5. [PMID: 24603167 DOI: 10.1159/000358013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 12/16/2013] [Indexed: 11/19/2022]
Abstract
The fetal ductus arteriosus (DA) closes postnatally first functionally and then structurally. Normal rise in blood oxygenation is regarded as a prime trigger, but closure may occur more slowly without this stimulus. Here, our aim was to assess the role of angiotensin II (Ang II) in functional closure of DA since its action may not be conditioned by oxygen. Experiments were performed with wild-type fetal and neonatal mice, using whole-body freezing technique to assess DA caliber in vivo. Transcripts for Ang II type 1 (AT1R) and type 2 (AT2R) receptors were also examined. We found that the AT1R antagonist olmesartan had no effect in the fetus, but delayed ductus closure in the neonate. However, this response was short-lived and disappeared upon concomitant treatment with the AT2R antagonist PD123319. Coincidentally, olmesartan promoted the Agtr2 transcript. We conclude that AT1R-based Ang II has no role in the functional closure of DA. Conversely, the compound may modulate this process through AT2R-mediated vasodilatation.
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Affiliation(s)
- Eleonora Pagni
- Institute of Life Sciences, Scuola Superiore Sant'Anna, Pisa, Italy
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17
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Drenjancevic I, Kibel A. Restoring Vascular Function with Hyperbaric Oxygen Treatment: Recovery Mechanisms. J Vasc Res 2013; 51:1-13. [DOI: 10.1159/000355925] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 09/05/2013] [Indexed: 11/19/2022] Open
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18
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19
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Ciofini E, Scebba F, Luin S, Sodini D, Angeloni D, Coceani F. Mouse aortic muscle cells respond to oxygen following cytochrome P450 3A13 gene transfer. Can J Physiol Pharmacol 2013; 91:369-74. [PMID: 23656416 DOI: 10.1139/cjpp-2012-0370] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have previously shown that a cytochrome P450 (CYP450) hemoprotein from the 3A subfamily CYP3A13 for the mouse, serves as the sensor in the contraction of the ductus arteriosus in response to increased oxygen tension. In addition, we have identified endothelin-1 (ET-1) as the effector for this response. Here, we examined whether Cyp3a13 gene transfer confers oxygen sensitivity to cultured muscle cells from mouse aorta. Coincidentally, we determined whether the same hemoprotein is normally present in the vessel. Cyp3a13-transfected aortic cells responded to oxygen, whereas no significant response was seen in native cells or in cells transfected with an empty vector. Furthermore, this oxygen effect was curtailed by the ET-1/ETA receptor antagonist BQ-123. We also found that CYP3A13 occurs naturally in aortic tissue and its isolated muscle cells in culture. We conclude that CYP3A13 is involved in oxygen sensing, and its action in the transfected muscle cells of the aorta, as in the native cells of the ductus, takes place through a linkage to ET-1. However, the response of aortic muscle to oxygen, conceivably entailing the presence of CYP3A13 at some special site, is not seen in the native situation, and may instead unfold upon transfection of the parent gene.
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Affiliation(s)
- Enrica Ciofini
- Institute of Life Sciences, Scuola Superiore Sant'Anna, 56100 Pisa, Italy
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20
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van Steenbeek FG, Spee B, Penning LC, Kummeling A, van Gils IHM, Grinwis GCM, Van Leenen D, Holstege FCP, Vos-Loohuis M, Rothuizen J, Leegwater PAJ. Altered subcellular localization of heat shock protein 90 is associated with impaired expression of the aryl hydrocarbon receptor pathway in dogs. PLoS One 2013; 8:e57973. [PMID: 23472125 PMCID: PMC3589449 DOI: 10.1371/journal.pone.0057973] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 01/29/2013] [Indexed: 01/29/2023] Open
Abstract
The aryl hydrocarbon receptor (AHR) mediates biological responses to toxic chemicals. An unexpected role for AHR in vascularization was suggested when mice lacking AHR displayed impaired closure of the ductus venosus after birth, as did knockout mice for aryl hydrocarbon receptor interacting protein (AIP) and aryl hydrocarbon receptor nuclear translocator (ARNT). The resulting intrahepatic portosystemic shunts (IHPSS) are frequently diagnosed in specific dog breeds, such as the Irish wolfhound. We compared the expression of components of the AHR pathway in healthy Irish wolfhounds and dogs with IHPSS. To this end, we analyzed the mRNA expression in the liver of AHR,AIP, ARNT, and other genes involved in this pathway, namely, those for aryl hydrocarbon receptor nuclear translocator 2 (ARNT2), hypoxia inducible factor 1alpha (HIF1A), heat shock protein 90AA1 (HSP90AA1), cytochromes P450 (CYP1A1, CYP1A2, and CYP1B1), vascular endothelial growth factor A (VEGFA), nitric oxide synthesase 3 (NOS3), and endothelin (EDN1). The observed low expression of AHR mRNA in the Irish wolfhounds is in associated with a LINE-1 insertion in intron 2, for which these dogs were homozygous. Down regulation in Irish wolfhounds was observed for AIP, ARNT2, CYP1A2, CYP1B1 and HSP90AA1 expression, whereas the expression of HIF1A was increased. Immunohistochemistry revealed lower levels of AHR, HIF1A, and VEGFA protein in the nucleus and lower levels of ARNT and HSP90AA1 protein in the cytoplasm of the liver cells of Irish wolfhounds. The impaired expression of HSP90AA1 could trigger the observed differences in mRNA and protein levels and therefore explain the link between two very different functions of AHR: regulation of the closure of the ductus venosus and the response to toxins.
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Affiliation(s)
- Frank G van Steenbeek
- Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
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21
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Cotton RB, Shah LP, Poole SD, Ehinger NJ, Brown N, Shelton EL, Slaughter JC, Baldwin HS, Paria BC, Reese J. Cimetidine-associated patent ductus arteriosus is mediated via a cytochrome P450 mechanism independent of H2 receptor antagonism. J Mol Cell Cardiol 2013; 59:86-94. [PMID: 23454087 DOI: 10.1016/j.yjmcc.2013.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 02/02/2013] [Accepted: 02/18/2013] [Indexed: 01/13/2023]
Abstract
Persistent patency of the ductus arteriosus (PDA) is a common problem in preterm infants. The antacid cimetidine is a potent antagonist of the H2 histamine receptor but it also inhibits certain cytochrome P450 enzymes (CYPs), which may affect DA patency. We examined whether cimetidine contributes to PDA and is mediated by CYP inhibition rather than H2 blockade. Analysis of a clinical trial to prevent lung injury in premature infants revealed a significant association between cimetidine treatment and PDA. Cimetidine and ranitidine, both CYP inhibitors as well as H2 blockers, caused relaxation of the term and preterm mouse DA. CYP enzymes that are inhibited by cimetidine were expressed in DA subendothelial smooth muscle. The selective CYP3A inhibitor ketoconazole induced greater DA relaxation than cimetidine, whereas famotidine and other H2 antagonists with less CYP inhibitory effects caused less dilation. Histamine receptors were developmentally regulated and localized in DA smooth muscle. However, cimetidine caused DA relaxation in histamine-deficient mice, consistent with CYP inhibition, not H2 antagonism, as the mechanism for PDA. Oxygen-induced DA constriction was inhibited by both cimetidine and famotidine. These studies show that antacids and other compounds with CYP inhibitory properties pose a significant and previously unrecognized risk for PDA in critically ill newborn infants.
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Affiliation(s)
- Robert B Cotton
- Department of Pediatrics, Vanderbilt University School of Medicine and the Monroe Carell Jr. Children's Hospital at Vanderbilt, Nashville, TN 37232, USA
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22
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Baragatti B, Ciofini E, Sodini D, Luin S, Scebba F, Coceani F. Hydrogen sulfide in the mouse ductus arteriosus: a naturally occurring relaxant with potential EDHF function. Am J Physiol Heart Circ Physiol 2013; 304:H927-34. [PMID: 23376828 DOI: 10.1152/ajpheart.00718.2012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We have previously reported that bradykinin relaxes the fetal ductus arteriosus via endothelium-derived hyperpolarizing factor (EDHF) when other naturally occurring relaxants (prostaglandin E2, nitric oxide, and carbon monoxide) are suppressed, but the identity of the agent could not be ascertained. Here, we have examined in the mouse whether hydrogen sulfide (H2S) is a relaxant of the ductus and, if so, whether it may also function as an EDHF. We found in the vessel transcripts for the H2S synthetic enzymes, cystathionine-γ-lyase (CSE) and cystathionine-β-synthase (CBS), and the presence of these enzymes was confirmed by immunofluorescence microscopy. CSE and CBS were distributed across the vessel wall with the former prevailing in the intimal layer. Both enzymes occurred within the endoplasmic reticulum of endothelial and muscle cells, whereas only CSE was located also in the plasma membrane. The isolated ductus contracted to inhibitors of CSE (d,l-propargylglycine, PPG) and CBS (amino-oxyacetic acid), and PPG contraction was attenuated by removal of the endothelium. EDHF-mediated bradykinin relaxation was curtailed by both PPG and amino-oxyacetic acid, whereas the relaxation to sodium nitroprusside was not affected by either treatment. The H2S donor sodium hydrogen sulfide (NaHS) was also a potent, concentration-dependent relaxant. We conclude that the ductus is endowed with a H2S system exerting a tonic relaxation. In addition, H2S, possibly via an overriding CSE source, qualifies as an EDHF. These findings introduce a novel vasoregulatory mechanism into the ductus, with implications for antenatal patency of the vessel and its transitional adjustments at birth.
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Abstract
Closure of the ductus arteriosus at birth is a complex phenomenon being conditioned by antenatal events and progressing in preprogrammed steps. Functional at first, narrowing of the vessel is determined by 2 overlapping processes--removal of the prostaglandin E(2)-based relaxation sustaining prenatal patency and activation of a constrictor mechanism by the natural rise in blood oxygen tension. Two schemes have been proposed for oxygen action--one involving a cytochrome P450 hemoprotein (sensor)/endothelin-1 (effector) complex and the other a set of voltage-gated K(+) channels. These proposals, however, are not mutually exclusive. Structural closure follows the constriction through a remodeling process initiated antenatally with the development of intimal cushions and completed postnatally by a host of humoral and mechanical stimuli. Research in this area has already provided clinical applications. Nevertheless, management of premature infants with persistent ductus remains troublesome and calls for an alternative approach to the prostaglandin E(2) inhibitors now in use. Studies in progress on the oxygen-sensing system may lead to a definitive solution for this problem.
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Affiliation(s)
- Flavio Coceani
- Institute of Life Sciences, Scuola Superiore Sant'Anna, Pisa, Italy.
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24
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Stoller JZ, Demauro SB, Dagle JM, Reese J. Current Perspectives on Pathobiology of the Ductus Arteriosus. ACTA ACUST UNITED AC 2012; 8. [PMID: 23519783 DOI: 10.4172/2155-9880.s8-001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The ductus arteriosus (DA) shunts blood away from the lungs during fetal life, but at birth this shunt is no longer needed and the vessel rapidly constricts. Postnatal persistence of the DA, patent ductus arteriosus (PDA), is predominantly a detrimental condition for preterm infants but is simultaneously a condition required to maintain systemic blood flow for infants born with certain severe congenital heart defects. Although PDA in preterm infants is associated with significant morbidities, there is controversy regarding whether PDA is truly causative. Despite advances in our understanding of the pathobiology of PDA, the optimal treatment strategy for PDA in preterm infants is unclear. Here we review recent studies that have continued to elucidate the fundamental mechanisms of DA development and pathogenesis.
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Affiliation(s)
- Jason Z Stoller
- Department of Pediatrics, University of Pennsylvania School of Medicine, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
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25
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van Steenbeek FG, van den Bossche L, Leegwater PAJ, Rothuizen J. Inherited liver shunts in dogs elucidate pathways regulating embryonic development and clinical disorders of the portal vein. Mamm Genome 2011; 23:76-84. [PMID: 22052005 PMCID: PMC3275728 DOI: 10.1007/s00335-011-9364-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Accepted: 10/13/2011] [Indexed: 12/14/2022]
Abstract
Congenital disorders of the hepatic portal vasculature are rare in man but occur frequently in certain dog breeds. In dogs, there are two main subtypes: intrahepatic portosystemic shunts, which are considered to stem from defective closure of the embryonic ductus venosus, and extrahepatic shunts, which connect the splanchnic vascular system with the vena cava or vena azygos. Both subtypes result in nearly complete bypass of the liver by the portal blood flow. In both subtypes the development of the smaller branches of the portal vein tree in the liver is impaired and terminal branches delivering portal blood to the liver lobules are often lacking. The clinical signs are due to poor liver growth, development, and function. Patency of the ductus venosus seems to be a digenic trait in Irish wolfhounds, whereas Cairn terriers with extrahepatic portosystemic shunts display a more complex inheritance. The genes involved in these disorders cannot be identified with the sporadic human cases, but in dogs, the genome-wide study of the extrahepatic form is at an advanced stage. The canine disease may lead to the identification of novel genes and pathways cooperating in growth and development of the hepatic portal vein tree. The same pathways likely regulate the development of the vascular system of regenerating livers during liver diseases such as hepatitis and cirrhosis. Therefore, the identification of these molecular pathways may provide a basis for future proregenerative intervention.
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Affiliation(s)
- Frank G van Steenbeek
- Faculty of Veterinary Medicine, Utrecht University, Yalelaan 104, PO Box 80154, 3508 TD Utrecht, The Netherlands.
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Coceani F, Scebba F, Angeloni D. Gene profiling in ductus arteriosus and aorta: a question of consistency. J Physiol Sci 2011; 61:443-4. [PMID: 21744167 PMCID: PMC10717251 DOI: 10.1007/s12576-011-0161-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Accepted: 06/18/2011] [Indexed: 10/24/2022]
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Baragatti B, Coceani F. Arachidonic acid epoxygenase and 12(S)-lipoxygenase: evidence of their concerted involvement in ductus arteriosus constriction to oxygen. Can J Physiol Pharmacol 2011; 89:329-34. [DOI: 10.1139/y11-025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Oxygen promotes closure of the ductus arteriosus at birth. We have previously presented a scheme for oxygen action with a cytochrome P450 (CYP450) hemoprotein and endothelin-1 (ET-1) being, respectively, sensor and effector, and a hypothetical monooxygenase product serving as a coupling link. We have also found in the vessel arachidonic acid (AA) 12(S)-lipoxygenase (12-lipoxygenase) undergoing upregulation at birth. Here, we examined the feasibility of a sensor-to-effector messenger originating from AA monooxygenase and 12-lipoxygenase pathways. The epoxygenase inhibitor, N-methylsulfonyl-6-(2-)hexanamide, suppressed the tonic contraction of ductus to oxygen. A similar effect was obtained with 12-lipoxygenase inhibitors baicalein and PD 146176. By contrast, none of the inhibitors modified the endothelin-1 contraction. Furthermore, an AA ω-hydroxylation product, 20-hydroxyeicosatetraenoic acid (20-HETE), reportedly responsible for oxygen contraction in the systemic microvasculature, had no such effect on the ductus. We conclude that AA epoxygenase and 12-lipoxygenase jointly produce a hitherto uncharacterized compound acting as oxygen messenger in the ductus.
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Affiliation(s)
- Barbara Baragatti
- Scuola Superiore Sant’Anna e Istituto di Fisiologia Clinica, Consiglio Nazionale delle Ricerche, 56100 Pisa, Italy
| | - Flavio Coceani
- Scuola Superiore Sant’Anna e Istituto di Fisiologia Clinica, Consiglio Nazionale delle Ricerche, 56100 Pisa, Italy
- Scuola Superiore Sant’Anna, Piazza Martiri della Libertà 33, 56127 Pisa, Italy
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