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• W2149558403 abstract "HomeHypertensionVol. 52, No. 5Oxygen and Perinatal Origins of Adulthood Diseases Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBOxygen and Perinatal Origins of Adulthood DiseasesIs Oxidative Stress the Unifying Element? Sandra T. Davidge, Jude S. Morton and Christian F. Rueda-Clausen Sandra T. DavidgeSandra T. Davidge From the Departments of Obstetrics and Gynecology/Physiology, University of Alberta; and the Women and Children’s Health Research Institute, Edmonton, Alberta, Canada. Search for more papers by this author , Jude S. MortonJude S. Morton From the Departments of Obstetrics and Gynecology/Physiology, University of Alberta; and the Women and Children’s Health Research Institute, Edmonton, Alberta, Canada. Search for more papers by this author and Christian F. Rueda-ClausenChristian F. Rueda-Clausen From the Departments of Obstetrics and Gynecology/Physiology, University of Alberta; and the Women and Children’s Health Research Institute, Edmonton, Alberta, Canada. Search for more papers by this author Originally published13 Oct 2008https://doi.org/10.1161/HYPERTENSIONAHA.108.120477Hypertension. 2008;52:808–810Other version(s) of this articleYou are viewing the most recent version of this article. Previous versions: October 13, 2008: Previous Version 1 In this issue of Hypertension, Yzydorczyk et a11 present a novel approach to investigate how adverse environmental conditions during the early stages of life can lead to cardiovascular complications during adulthood. The authors used a model in which newborn rats were exposed to 80% oxygen from postnatal days 3 to 10. Although the rats used in the study were born at term, the authors suggest that, in some respects, their developmental stage is equivalent to that of a preterm fetus, allowing some aspects, such as kidney, lung, and vascular development, to be related to premature infants. Therefore, the approach taken by Yzydorczyk et al1 also provides additional clinical significance to their findings that may have implications in the care of premature babies in neonatal intensive care units and the use of oxygen therapy.The ability of organisms to adapt to certain environmental conditions by permanently changing key functional elements is a fascinating concept that has been with us for a long time. One of the events that popularized this “programming” concept was the publishing of an article by Barker and Osmond2 in the early 1980s that demonstrated an association between low birth weight and an increment in standardized mortality rates later in life. During the following decades, other epidemiological studies linked adverse conditions during fetal stages and early childhood with adverse health outcomes later in life, including coronary heart disease, stroke, type 2 diabetes mellitus, and metabolic syndrome.3 Also known as the “fetal origins of adult disease” theory, this association between environment and disease has become a controversial topic studied by many groups. Consequently, a growing body of literature has proposed multiple mechanisms to explain the early stages of programming. However, after 25 years of research, no consensus has been reached regarding the specific pathophysiological mechanisms causing this fascinating phenomenon or the specific time frame (susceptibility window) in which it occurs.Following the legacy of the work by Barker and Osmond,2 many authors have used various models of intrauterine growth restriction (IUGR) to investigate particular aspects in the early stages of development.4 Human fetuses have several mechanisms to compensate for an acute nutritional restriction,5 whereas they have limited reserves to compensate for oxygen insufficiencies. Low oxygen levels in the feto-placental circulation, a condition commonly associated with several obstetric complications such as IUGR and preeclampsia, have been found to impact not only the neonate but also the cardiovascular health of the adult offspring. Both adult vascular function6 and structure7 are adversely affected by prenatal oxygen deprivation. In addition, nephron numbers are reduced in IUGR models, potentially via hypoxia-related changes in mitochondrial function leading to increased apoptosis.8Interestingly, not only oxygen restriction but also exposure to high oxygen levels, such as those commonly used in the treatment of premature infants and modeled by Yzydorczyk et al,1 has been shown to have both acute and chronic detrimental effects, such as retinopathy of prematurity, respiratory distress syndrome, pulmonary hypertension, and cerebral palsy.9 Together, these data suggest that the level of oxygen exposure, either too little or too high, has a direct bearing on the handling of oxygen within the body. Although oxygen is critical to life, the balance between oxidant and antioxidant pathways determines whether this molecule acts as a friend or foe. An imbalance in oxygen availability or antioxidant levels can lead to increased production of reactive oxygen species (ROS) and subsequent oxidative stress in the tissues.ROS are produced from many cellular sources, including NO synthase, NADPH oxidase, electron transport, metals, and lipids, to name a few, whereas many cellular signaling pathways have also been linked to oxidant regulatory mechanisms. Of particular interest is that angiotensin II has been demonstrated to be regulated by oxidant status. In their work, Yzydorczyk et al1 showed that, in adult rats exposed to 80% oxygen as neonates, in vitro vascular responses were specifically increased to angiotensin II but not to phenylephrine, an adrenergic agonist, or U46119, a thromboxane analogue. This undesirable effect of postnatal hyperoxia was reversed by the antioxidant Tempol, a superoxide dismutase analogue, suggesting a direct relation to increased oxidative stress in these vessels. This can lead to impaired vasodilation, as shown by decreased endothelial function in their male animals.1 Yzydorczyk et al1 also demonstrated decreased microvascular density and nephron count. Although not tested by the authors, it is tempting to speculate that ROS may be a common mediating pathway that also lead to reduced nephron number and capillary rarefaction, perhaps secondary to increased apoptosis and impaired angiogenesis, as observed previously in IUGR models.7,8Interestingly, oxidative stress has been shown previously to be increased in IUGR infants, probably because of a decrease in the antioxidant levels10 leading to increased ROS levels. Despite being the opposite extremes of oxygen availability, there seems to be a common participation of increased oxidative stress in the pathophysiology of chronic diseases mediated by hypoxia and hyperoxia (see the Figure). Download figureDownload PowerPointFigure. Representation of potential common pathways in the “fetal origins of adult disease” theory. In conditions such as prematurity, as modeled by Yzydorczyk et al,1 or IUGR, many underlying pathologies could be attributable to increased oxidative stress related to changes in oxygen (O2) availability at a critical point in fetal or neonatal development. As depicted, both high and low oxygen impact the production of ROS by affecting oxidant and antioxidant levels within the body. Increased ROS decrease vascular density, endothelial function, and nephron number,1 potentially leading to hypertension, atherosclerosis, and, ultimately, adverse cardiovascular outcomes.Yzydorczyk et al1 have taken a novel approach to the programming issue by directly inducing generalized oxidative stress in neonatal rats and studying the consequential effects on kidney structure, blood pressure, vascular structure, and function, all of which have been associated with cardiovascular health. This provides the basis for a potential common linkage among prematurity or IUGR, oxidative stress, and common cardiovascular outcomes. The stage at which the oxygen insult occurs, either in utero during hypoxia-induced IUGR or during the premature/neonatal period in the current study by Yzydorczyk et al,1 also suggests that the time frame in which programming may occur extends to both prenatal and postnatal stages.In conclusion, the authors have presented an interesting article suggesting that oxygen and antioxidant capacity may be key players in “perinatal programming” of adult disease. A fascinating element of programming is the suggestion that the developing organism can rapidly adapt to adverse conditions to favor survival. However, the long-term consequences of these adaptations could have a significant impact on cardiovascular health later in life. Therefore, understanding the mechanisms behind this observation may open new avenues in the management of cardiovascular risk factors and chronic diseases.The opinions expressed in this editorial are not necessarily those of the editors or of the American Heart Association.Sources of FundingThe Davidge laboratory is supported by operating grants from Canadian Institute of Health Research, Heart and Stroke Foundation of Canada, and Pfizer Canada. C.F.R-C. is a fellow of the Strategic Training Program in Maternal, Fetal, and Newborn Health and the Tomorrow’s Research Cardiovascular Health Professionals. J.S.M. is supported by the Heart and Stroke Foundation of Canada, Alberta Heritage Foundation for Medical Research, and Strategic Training Program in Maternal, Fetal, and Newborn Health. S.T.D. is an Alberta Heritage Foundation for Medical Research Scientist and a Canada Research Chair in Women’s Cardiovascular Health.DisclosuresNone.FootnotesCorrespondence to Sandra T. Davidge, 220 HMRC, University of Alberta, Edmonton, Alberta, Canada T6G 2S2. E-mail [email protected] References 1 Yzydorczyk C, Comte B, Cambonie G, Lavoie J-C, Germain N, Shin YT, Wolff J, Deschepper C, Touyz RM, Lelièvre-Pegorier M, Nyut AM. Neonatal oxygen exposure in rats leads to cardiovascular and renal alterations in adulthood. Hypertension. 2008; 52: 889–895.LinkGoogle Scholar2 Barker DJ, Osmond C. Infant mortality, childhood nutrition and ischaemic heart disease in England and Wales. Lancet. 1986; 327: 1077–1081.CrossrefGoogle Scholar3 Godfrey KM, Barker DJ. Fetal programming and adult health. Public Health Nutr. 2001; 4: 611–624.CrossrefMedlineGoogle Scholar4 Vuguin PM. Animal models for small for gestational age and fetal programming of adult disease. Horm Res. 2007; 68: 113–123.Google Scholar5 Jobgen WS, Ford SP, Jobgen SC, Feng CP, Hess BW, Nathanielsz PW, Li P, Wu G. Baggs ewes adapt to maternal undernutrition and maintain conceptus growth by maintaining fetal plasma concentrations of amino acids. J Anim Sci. 2008; 86: 820–826.CrossrefMedlineGoogle Scholar6 Williams SJ, Hemmings DG, Mitchell JM, McMillen IC, Davidge ST. Effects of maternal hypoxia or nutrient restriction during pregnancy on endothelial function in adult male rat offspring. J Physiol. 2005; 565: 125–135.CrossrefMedlineGoogle Scholar7 Pladys P, Sennlaub F, Brault S, Checchin D, Lahaie I, Lê NL, Bibeau K, Cambonie G, Abran D, Brochu M, Thibault G, Hardy P, Chemtob S, Nuyt AM. Microvascular rarefaction and decreased angiogenesis in rats with fetal programming of hypertension associated with exposure to a low-protein diet in utero. Am J Physiol Regul Integr Comp Physiol. 2005; 289: R1580–R1588.CrossrefMedlineGoogle Scholar8 Tanaka T, Hanafusa N, Ingelfinger JR, Ohse T, Fujita T, Nangaku M. Hypoxia induces apoptosis in SV40-immortalized rat proximal tubular cells through the mitochondrial pathways, devoid of HIF-1-mediated upregulation of Bax. Biochem Biophys Res Commun. 2003; 309: 222–231.CrossrefMedlineGoogle Scholar9 Greenough A. Long-term pulmonary outcome in the preterm infant. Neonatology. 2008; 93: 324–327.CrossrefMedlineGoogle Scholar10 Hracsko Z, Orvos H, Novak Z, Pal A, Varga IS. Evaluation of oxidative stress markers in neonates with intra-uterine growth retardation. Redox Rep. 2008; 13: 11–16.CrossrefMedlineGoogle Scholar eLetters(0)eLetters should relate to an article recently published in the journal and are not a forum for providing unpublished data. Comments are reviewed for appropriate use of tone and language. Comments are not peer-reviewed. Acceptable comments are posted to the journal website only. Comments are not published in an issue and are not indexed in PubMed. Comments should be no longer than 500 words and will only be posted online. References are limited to 10. Authors of the article cited in the comment will be invited to reply, as appropriate.Comments and feedback on AHA/ASA Scientific Statements and Guidelines should be directed to the AHA/ASA Manuscript Oversight Committee via its Correspondence page.Sign In to Submit a Response to This Article Previous Back to top Next FiguresReferencesRelatedDetailsCited By Cooke C and Davidge S (2019) Advanced maternal age and the impact on maternal and offspring cardiovascular health, American Journal of Physiology-Heart and Circulatory Physiology, 10.1152/ajpheart.00045.2019, 317:2, (H387-H394), Online publication date: 1-Aug-2019. Ingelfinger J (2019) The Contributions of Perinatal Programming to Blood Pressure Levels in Childhood and Beyond Hypertension in Children and Adolescents, 10.1007/978-3-030-18167-3_2, (17-30), . Hanson M and Gluckman P (2014) Early Developmental Conditioning of Later Health and Disease: Physiology or Pathophysiology?, Physiological Reviews, 10.1152/physrev.00029.2013, 94:4, (1027-1076), Online publication date: 1-Oct-2014. Ortiz-Espejo M, Gil-Campos M, Mesa M, García-Rodríguez C, Muñoz-Villanueva M and Pérez-Navero J (2013) Alterations in the antioxidant defense system in prepubertal children with a history of extrauterine growth restriction, European Journal of Nutrition, 10.1007/s00394-013-0569-8, 53:2, (607-615), Online publication date: 1-Mar-2014. Giussani D, Niu Y, Herrera E, Richter H, Camm E, Thakor A, Kane A, Hansell J, Brain K, Skeffington K, Itani N, Wooding F, Cross C and Allison B (2014) Heart Disease Link to Fetal Hypoxia and Oxidative Stress Advances in Fetal and Neonatal Physiology, 10.1007/978-1-4939-1031-1_7, (77-87), . Giussani D and Davidge S (2013) Developmental programming of cardiovascular disease by prenatal hypoxia, Journal of Developmental Origins of Health and Disease, 10.1017/S204017441300010X, 4:5, (328-337), Online publication date: 1-Oct-2013. Kallash M, Ingelfinger J and Vehasakari V (2013) Perinatal Programming and Blood Pressure Pediatric Hypertension, 10.1007/978-1-62703-490-6_7, (103-120), . Rogers L and Velten M (2011) Maternal inflammation, growth retardation, and preterm birth: Insights into adult cardiovascular disease, Life Sciences, 10.1016/j.lfs.2011.07.017, 89:13-14, (417-421), Online publication date: 1-Sep-2011. Lee S, Sirajudeen K, Sundaram A, Zakaria R and Singh H (2011) Effects of antenatal, postpartum and post-weaning melatonin supplementation on blood pressure and renal antioxidant enzyme activities in spontaneously hypertensive rats, Journal of Physiology and Biochemistry, 10.1007/s13105-010-0070-2, 67:2, (249-257), Online publication date: 1-Jun-2011. Luyckx V, Compston C, Simmen T and Mueller T (2009) Accelerated senescence in kidneys of low-birth-weight rats after catch-up growth, American Journal of Physiology-Renal Physiology, 10.1152/ajprenal.00462.2009, 297:6, (F1697-F1705), Online publication date: 1-Dec-2009. November 2008Vol 52, Issue 5 Advertisement Article InformationMetrics https://doi.org/10.1161/HYPERTENSIONAHA.108.120477PMID: 18852382 Originally publishedOctober 13, 2008 PDF download Advertisement SubjectsAnimal Models of Human DiseaseMechanisms" @default.
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