Abstracts of Scientific Presentations 2011 AALAS National Meeting San Diego, California

Total Page:16

File Type:pdf, Size:1020Kb

Abstracts of Scientific Presentations 2011 AALAS National Meeting San Diego, California Journal of the American Association for Laboratory Animal Science Vol 50, No 5 Copyright 2011 September 2011 by the American Association for Laboratory Animal Science Pages 722–820 Abstracts of Scientific Presentations 2011 AALAS National Meeting San Diego, California Platform Sessions in managing personal and professional connections on one site, one should consider separating such connections, for example, keeping PS1 Evaluation of Different Bedding Substrates on the Reproductive personal connections on a social site, while maintaining business con- Success of 4 Mouse Strains nections through a professional site. Some social networking websites commonly incorporate applications where one is automatically enrolled DL Hickman*, MP Swan which share information with third parties such as what websites one may have visited. This presentation is designed for anyone that may Indiana University School of Medicine, Indianapolis, IN be considering the use, or is already using social networking media. It will provide some “dos and don’ts,” as well as educate the participant Bedding substrate selection can be a difficult decision for the advi- on successful navigation through the social media cyber world. sory staff as picking a universal bedding is highly dependent on cost, researcher need, and facility preference. This study examined the effects PS3 Post Approval Monitoring: Lessons Learned of bedding substrate on reproductive success to evaluate concerns that * phytoestrogens or mitogens in corncob based beddings may interfere S Doss , R Banks with reproductive success in mice. Thirty-six each of ICR, C57BL/6, C3H, and DBA mice were placed into monogamous breeding pairs and Office of Animal Welfare Assurance, Duke University Medical Center, divided into 3 treatment groups with an n = 6 per group. Each group Durham, NC was placed on one of 3 substrates: ¼’ corncob bedding, shredded aspen, or recycled paper. The pairs were maintained continuously for 4 mo or Institutional Animal Care and Use Committees (IACUC) are charged, until the third litter of offspring was weaned. Pups per female per day, under federal laws, regulations, and policies, with providing oversight a commonly used calculation to monitor the production efficiency of of all animal activities. In smaller animal care programs, oversight may commercial mouse colonies, was compared between bedding substrate be accomplished by IACUC members and veterinary staff; however, using an ANOVA. No statistical significance was found between bed- as the size and complexity of the animal care program increases the ding substrate treatment groups (ICR, P = 0.4679; C57BL/6, P = 0.3912; oversight burden also increases. One means of accomplishing this C3H, P = 0.6510; DBA, P = 0.9545). No statistical significance was found oversight is by creating and implementing a program of post approval in the success survivability for each litter, as defined by number of pups monitoring. Endorsed in the eighth edition of the Guide for the Care and weaned divided by number of pups born, between bedding substrate Use of Laboratory Animals, the concept of post approval monitoring after treatment groups when analyzed by ANOVA (ICR, P = 0.5999; C57BL/6, the initial IACUC protocol approval provides a valuable tool to the P = 0.9962; C3H, P = 0.5574; DBA, P = 0.4307). No statistical significance institution to assure the integrity of the program. Your institution may was found in the number of litters produced by each female between consider planning and applying a program of post approval monitor- bedding substrate treatment groups (ICR, P = 0.4490; C57BL/6, P = ing, just as our institution did in the fall of 2004. Over the last 7 y, our 0.2948; C3H, P = 0.3482; DBA, P = 0.9229) when analyzed by ANOVA. post approval monitoring program has adapted to meet the needs of This study demonstrated that there were no statistically significant our research community. The post approval monitoring program that differences in the reproductive efficiency of these 2 strains of mice initially revealed a relatively low compliance rate and encountered when housed on these 3 bedding types, suggesting that all are suitable resistance from investigators has evolved into a program that exhibits a possibilities for the support of mouse breeding colonies. high percentage of compliance, acceptance by the research community, and self-reporting of potential noncompliance and adverse events from PS2 Social Media and Laboratory Animal Science: Dos and Don’ts research staff. Several supplemental programs have been designed and for Laboratory Animal Science Personnel implemented as a result of the post approval monitoring program: required yearly online training for all animal users which emphasizes SW Baran*1,2, MI Perret-Gentil3, J Kehler1 the main compliance issues from the previous year, an institutional research animal coordinator program, and numerous IACUC policies 1Veterinary Bioscience Institute, Harleysville, PA; 2Office of Professional including adverse events and controlled substances. The program of Studies in the Health Sciences, Drexel University College of Medicine, post approval monitoring has provided our institution with the best in- Philadelphia, PA; 3Laboratory Animal Resources Center, The University surance of animal wellbeing and welfare and quality research outcomes. of Texas at San Antonio, San Antonio, TX PS4 Use of Review Software for IACUC Protocol Review and Member Social media is rapidly gaining enormous momentum, and today 47% Training Documentation of online adults use a social networking website. Social media is chang- * ing the way we communicate both in our personal and professional lives. J Lyons , SL Pritt Utilization of these sites provides great opportunities for networking but not without the risk of losing privacy. We will address social media, Absorption Systems, San Diego, CA the effect it may have on management and employees, the security of the employee’s company, and suggested guidelines for individuals of Many Institutional Animal Care and Use Committee (IACUC) proto- the laboratory animal community to consider before posting personal col management software systems exist. The majority of these systems information on social networking sites. Another very important factor is require customization, significant lead time, and changes to existing the potential exposure of people in the LAS community to animal rights protocol templates. Some have minimal to no ability to document activists. Social media can expand the interaction between you and your IACUC member training. Our facility sought a readily available, cost employees beyond the work place, but it can also contribute to daily effective, web-based system that focused only on document review. distractions. Managers should consider categorizing their connections A review software was selected as a hosted, web-based document into professional and personal connections. Professional connections review system that tracks changes, comments, and responses made provide an opportunity to ask and receive valuable input to questions, from multiple reviewers and authors. We chose to retain our IACUC share opportunities, and discuss work related challenges. For managers protocol form in a word-processing document template. New IACUC wishing to network (whether it be through electronic media or other protocols are uploaded into the review software for prereview by the means) with their staff, an issue to consider might be the perception of attending veterinarian, since the program allows document review by preferential treatment towards a particular employee. Perceived ineq- different, sequential layers of reviewers. During reviews, members can uities could result in resentment and loss of unit morale. People that insert comments and questions into the document. Once the attending connect with business associates on social networking sites should be veterinarian’s review is complete, the document is opened up for review cautious on how their postings are perceived. Because of the difficulty by all IACUC members. Emails are automatically generated and sent to 722 Abstracts of scientific papers 2011 AALAS National Meeting IACUC members when a protocol is ready for review. All members can in vivo can be disrupted by light at night via melatonin suppression, state if the protocol is acceptable for designated member review (DMR) predisposing animals to type II diabetes. Improved facility design and or must go to full committee. Selected protocols are approved by the adherence to diurnal lighting protocols, as outlined in The Guide, are DMR, plus time stamped and dated. Standard operating procedures, essential to the health and wellbeing of laboratory animals and to the regulatory documents, and other training items can be uploaded. IA- credible outcome of scientific investigations. CUC members receive automated emails inviting them to review the items and document their training. Each user is given a username and PS7 When Undergraduates are Targets: Considering Animal Rights password and has access to the review software training modules. It Extremists and Student Safety in the IACUC Crisis Management Plan took approximately 1 mo to convert to the review software system. The existing protocol numbering system was retained. The review software JD Stemwedel* offers a convenient, secure, web-based approach to reviewing and approving IACUC documents without the need to purchase software Philosophy, San Jose State University, San Jose, CA systems that
Recommended publications
  • Pregnant Body Book
    THETHE COMPLETECOMPLETE ILLUSTRATEDILLUSTRATED GUIDEGUIDE FROMFROM CONCEPTIONCONCEPTION TOTO BIRTHBIRTH THE PREGNANT BODY BOOK THE PREGNANT BODY BOOK DR. SARAH BREWER SHAONI BHATTACHARYA DR. JUSTINE DAVIES DR. SHEENA MEREDITH DR. PENNY PRESTON Editorial consultant DR. PAUL MORAN GENETICS 46 THE MOLECULES OF LIFE 48 HOW DNA WORKS 50 PATTERNS OF INHERITANCE 52 GENETIC PROBLEMS AND 54 INVESTIGATIONS THE SCIENCE OF SEX 56 THE EVOLUTION OF SEX 58 ATTRACTIVENESS 62 HUMAN PREGNANCY 6 DESIRE AND AROUSAL 64 THE EVOLUTION OF PREGNANCY 8 THE ACT OF SEX 66 MEDICAL ADVANCES 10 BIRTH CONTROL 68 IMAGING TECHNIQUES 12 GOING INSIDE 14 CONCEPTION TO BIRTH 70 TRIMESTER 1 72 ANATOMY 24 MONTH 1 74 BODY SYSTEMS 26 WEEKS 1–4 74 THE MALE REPRODUCTIVE SYSTEM 28 MOTHER AND EMBRYO 76 THE PROSTATE GLAND, PENIS, 30 AND TESTES KEY DEVELOPMENTS: MOTHER 78 MALE PUBERTY 31 CONCEPTION 80 HOW SPERM IS MADE 32 FERTILIZATION TO IMPLANTATION 84 THE FEMALE REPRODUCTIVE SYSTEM 34 EMBRYONIC DEVELOPMENT 86 THE OVARIES AND FALLOPIAN TUBES 36 SAFETY IN PREGNANCY 88 THE UTERUS, CERVIX, AND VAGINA 40 DIET AND EXERCISE 90 THE BREASTS 42 MONTH 2 92 FEMALE PUBERTY 43 WEEKS 5–8 92 THE FEMALE REPRODUCTIVE CYCLE 44 MOTHER AND EMBRYO 94 CONTENTS london, new york, melbourne, DESIGNERS Riccie Janus, ILLUSTRATORS munich, and dehli Clare Joyce, Duncan Turner DESIGN ASSISTANT Fiona Macdonald SENIOR EDITOR Peter Frances INDEXER Hilary Bird CREATIVE DIRECTOR Rajeev Doshi SENIOR ART EDITOR Maxine Pedliham SENIOR 3D ARTISTS Rajeev Doshi, Arran Lewis PICTURE RESEARCHERS Myriam Mégharbi, 3D ARTIST Gavin Whelan PROJECT EDITORS Joanna Edwards, Nathan Joyce, Karen VanRoss Lara Maiklem, Nikki Sims ADDITIONAL ILLUSTRATORS PRODUCTION CONTROLLER Erika Pepe Peter Bull Art Studio, Antbits Ltd EDITORS Salima Hirani, Janine McCaffrey, PRODUCTION EDITOR Tony Phipps Miezan van Zyl DVD minimum system requirements MANAGING EDITOR Sarah Larter PC: Windows XP with service pack 2, US EDITOR Jill Hamilton MANAGING ART EDITOR Michelle Baxter Windows Vista, or Windows 7: Intel or AMD processor; soundcard; 24-bit color display; US CONSULTANT Dr.
    [Show full text]
  • Formaldehyde Induces Bone Marrow Toxicity in Mice by Inhibiting Peroxiredoxin 2 Expression
    MOLECULAR MEDICINE REPORTS 10: 1915-1920, 2014 Formaldehyde induces bone marrow toxicity in mice by inhibiting peroxiredoxin 2 expression GUANGYAN YU1, QIANG CHEN1, XIAOMEI LIU1, CAIXIA GUO2, HAIYING DU1 and ZHIWEI SUN1,2 1Department of Preventative Medicine, School of Public Health, Jilin University, Changchun, Jilin 130021; 2 Department of Hygenic Toxicology, School of Public Health, Capital Medical University, Beijing 100069, P.R. China Received November 4, 2013; Accepted June 5, 2014 DOI: 10.3892/mmr.2014.2473 Abstract. Peroxiredoxin 2 (Prx2), a member of the perox- Introduction iredoxin family, regulates numerous cellular processes through intracellular oxidative signal transduction pathways. Formaldehyde (FA) is an environmental agent commonly Formaldehyde (FA)-induced toxic damage involves reactive found in numerous products, including paint, cloth and oxygen species (ROS) that trigger subsequent toxic effects and exhaust gas, as well as other medicinal and industrial products. inflammatory responses. The present study aimed to inves- FA exposure has raised significant concerns due to mounting tigate the role of Prx2 in the development of bone marrow evidence suggesting its carcinogenic potential and severe toxicity caused by FA and the mechanism underlying FA effects on human health (1). Epidemiological and experi- toxicity. According to the results of the preliminary inves- mental data have demonstrated that FA may cause leukemia, tigations, the mice were divided into four groups (n=6 per particularly myeloid leukemia; however, the mechanism group). One group was exposed to ambient air and the other underlying this effect remains unclear (2-4). In the process three groups were exposed to different concentrations of FA of tumor formation, DNA damage may be the initiating (20, 40, 80 mg/m3) for 15 days in the respective inhalation factor (5), while myeloperoxidase (MPO) activity is associ- chambers, for 2 h a day.
    [Show full text]
  • Peroxiredoxins in Neurodegenerative Diseases
    antioxidants Review Peroxiredoxins in Neurodegenerative Diseases Monika Szeliga Mossakowski Medical Research Centre, Department of Neurotoxicology, Polish Academy of Sciences, 5 Pawinskiego Street, 02-106 Warsaw, Poland; [email protected]; Tel.: +48-(22)-6086416 Received: 31 October 2020; Accepted: 27 November 2020; Published: 30 November 2020 Abstract: Substantial evidence indicates that oxidative/nitrosative stress contributes to the neurodegenerative diseases. Peroxiredoxins (PRDXs) are one of the enzymatic antioxidant mechanisms neutralizing reactive oxygen/nitrogen species. Since mammalian PRDXs were identified 30 years ago, their significance was long overshadowed by the other well-studied ROS/RNS defense systems. An increasing number of studies suggests that these enzymes may be involved in the neurodegenerative process. This article reviews the current knowledge on the expression and putative roles of PRDXs in neurodegenerative disorders such as Alzheimer’s disease, Parkinson’s disease and dementia with Lewy bodies, multiple sclerosis, amyotrophic lateral sclerosis and Huntington’s disease. Keywords: peroxiredoxin (PRDX); oxidative stress; nitrosative stress; neurodegenerative disease 1. Introduction Under physiological conditions, reactive oxygen species (ROS, e.g., superoxide anion, O2 -; · hydrogen peroxide, H O ; hydroxyl radical, OH; organic hydroperoxide, ROOH) and reactive nitrogen 2 2 · species (RNS, e.g., nitric oxide, NO ; peroxynitrite, ONOO-) are constantly produced as a result of normal · cellular metabolism and play a crucial role in signal transduction, enzyme activation, gene expression, and regulation of immune response [1]. The cells are endowed with several enzymatic (e.g., glutathione peroxidase (GPx); peroxiredoxin (PRDX); thioredoxin (TRX); catalase (CAT); superoxide dismutase (SOD)), and non-enzymatic (e.g., glutathione (GSH); quinones; flavonoids) antioxidant systems that minimize the levels of ROS and RNS.
    [Show full text]
  • New Parents' Guide
    New Parents’ Guide Created in collaboration with The Childbirth Education Association of Cincinnati 1 Congratulations! Congratulations on your pregnancy! Whether you’ve been planning for years or you received a happy surprise, we’re honored and excited to support you through one of the most unique and exciting chapters in your life. You may feel a range of emotions about becoming a mom (anxious, eager, scared), and you’ll probably have some questions along the way. Together with the Childbirth Education Association, we’ve compiled the information and resources you need to feel confident and prepared when your new baby arrives. We want to help you navigate your pregnancy journey with as little stress as possible, so you can focus on what matters most: welcoming your new baby with Childbirth Education Video joy and love. Series To help families prepare for everything from pregnancy to postpartum, Pampers developed a nine-part Childbirth Education Video Series to help supplement this guide. Visit Pampers.com to learn more. 2 SECTION 1: What to Expect During Pregnancy Your Baby’s Development (by trimester) First Trimester (1-12 Weeks) In the weeks following conception, your baby starts to develop its brain, spinal cord, heart and other organs. • The neural tube along your baby’s back starts to close, forming a C-shape along the spine 1and giving it a curve that your baby will maintain for much of the pregnancy. • Structures in and around your baby’s head and nose form, like the eyes and ears. • The eyelids and external ears continue to develop while your baby’s length increases to First Trimester about 2 ½ inches.
    [Show full text]
  • Lady Parts Auser’S Guideto 42 Pamper Your Body, Mind and Spirit
    It's all about Caring for Your Lady You“Me Time” 21 IDEAS Parts Best Date RESTAURANTS CURATE Your SPACE FEBRUARY 2020 $3.95 BRAVAMAGAZINE.COM INVIVOSCIENCES Can Grow Your Heart Tissue Fresh Inspiration for the New Year! February Dream Big Events At DreamBank! THURSDAY THURSDAY THURSDAY FEBRUARY 6 FEBRUARY 13 FEBRUARY 20 6:15–7:30 pm 6:15–7:30 pm 6:15–7:30 pm ALLISON LIDDLE LISA ROBB LAURA BERMUDO The Art of Imperfect Action: Living in a Enough with Feeling All Success Comes From Kaleidoscope World Not Enough Daring to Begin For more inspiration visit: AmFam.com/DreamBank FREE EVENTS | IN THE HEART OF MADISON | OPEN TO ALL | RSVP BY VISITING: amfam.com/dreambank Mon – Thur: 8 am – 8 pm | Fri: 8 am – 5 pm | Sat: 9 am – 4 pm | Sun: Closed 821 East Washington Avenue | Madison, WI 53703 | 608.286.3150 | amfam.com/dreambank American Family Mutual Insurance Company S.I., American Family Insurance Company, 6000 American Parkway, Madison, WI 53783 ©2020 017857 – 1/20 ONEDAY CONFERENCE TO EMPOWER, EDUCATE & NETWORK WITH PROFESSIONAL MADISON WOMEN JOIN US MAY 8, 2020 The Madison Concourse Hotel 8 a.m. to 4 p.m. TITLE SPONSOR THRIVEWITHBRAVA.COM BRAVA | FEBRUARY 2020 32 Leading From the Heart Meet Ayla Annac, CEO of a cutting-edge, Madison- based biotech company. PHOTOGRAPHY BY HILLARY SCHAVE HILLARY BY PHOTOGRAPHY A User’s Guide to Love the One You’re With 26 Your Lady Parts 42 (That's You!) How to maintain your sexual Treat yourself to the city’s finest ways to health through the decades.
    [Show full text]
  • Preparing for the Birth of Your Baby
    Preparing for the birth of your baby The end of your pregnancy journey is in sight The last few weeks of pregnancy may feel the longest and are often the busiest. You might be eager to see your feet and sleep on your stomach again. You’re probably also tired of running to the bathroom in the wee hours of the night to relieve your bladder. Welcome to the end stage of your pregnancy, where time seems to slow down and the waiting seems never ending. Pass the time productively by getting as much done as you can before the big day arrives but also ensure that you get enough rest. Nesting When you are driven by the urge to do things like reorganising the cupboards, alphabetising the spice rack, pairing up all the stray socks that have lost their partners, defrosting the freezer, cleaning the bathroom’s tile grout with a toothbrush and getting rid of dust under the bed, this is part of a pre-labour ritual commonly known as nesting. In nature, expectant mothers prepare their ’nest’ for the soon-to-arrive baby; and the nesting instinct in humans can be as powerful as it is for animals. If and when the nesting instinct hits you, make the most of this productive phase. Here are some suggested things that you might want to tick off your list before labour and delivery: Restock your fridge As you prepare for birth, throw away any outdated items and shop for fresh ones. Stock up on key essentials like milk, yoghurt, cheese, juice, fruits and vegetables, fruit and meat you’ll want to have on hand once you’re home with your baby .
    [Show full text]
  • 1L1 an Outsider S Take on Autism Spectrum Disorders
    Plenary Lecture 特別講演 1L1 An outsider’s take on autism spectrum disorders ○Martin Raff MRC LMCB, University College London Autism spectrum disorders(ASDs)are among the commonest neuropsychiatric disorders. Although, until re- cently, ASDs were one of the least understood of these disorders, they are now one of the best understood. Pro- gress has come largely through recent advances in human genetics that have identified rare large!effect muta- tions that cause or greatly increase the risk of these disorders, together with studies of genetic mouse models based on these mutations. Remarkably, in a number of mouse models caused by single mutations, correction of the problem in the adult brain(with either drugs or genetic manipulations)largely reverses many of the behav- ioral and neurobiological abnormalities, providing hope for the development of therapies for individuals with ASDs. In my talk, I will review the basic features of ASDs, using home videos of the development of my 13!year! old autistic grandson as an example, and I will discuss some of the recent advances in ASD research, consider current puzzles, and speculate on possible ways forward. Plenary Lecture 特別講演 2L1 A role of drebrin A in the activity!dependent trafficking of NMDA receptors to the plasma membrane ○Chiye Aoki1,Sho Fujisawa1,Kei Tateyama1,Yi!Wen Chen1,Tomoaki Shirao2 1Center for Neural Science, New York University 2Dept of Neurobiology and Behavior, Gunma Univ Graduate School of Medicine NMDA receptors(NMDARs)are central molecular agents that enable the activity!dependent modification of synaptic strengths at excitatory synapses. However, relatively little is known about the molecular mechanisms regulating NMDAR levels at each synapse.
    [Show full text]
  • Overview on Peroxiredoxin
    Mol. Cells 2016; 39(1): 1-5 http://dx.doi.org/10.14348/molcells.2016.2368 Molecules and Cells http://molcells.org Overview Established in 1990 Overview on Peroxiredoxin Sue Goo Rhee* Peroxiredoxins (Prxs) are a very large and highly con- 2-Cys Prxs Tsa1 and Tsa2, two atypical 2-Cys Prxs Ahp1 and served family of peroxidases that reduce peroxides, with a nTpx (where n stands for nucleus), and one 1-Cys mTpx conserved cysteine residue, designated the “peroxidatic” (where m stands for mitochondria) [see the review by by Tole- Cys (CP) serving as the site of oxidation by peroxides (Hall dano and Huang (2016)]. et al., 2011; Rhee et al., 2012). Peroxides oxidize the CP-SH to cysteine sulfenic acid (CP–SOH), which then reacts with CLASSIFICATION another cysteine residue, named the “resolving” Cys (CR) to form a disulfide that is subsequently reduced by an The CP residue is conserved in all Prx enzymes. On the basis appropriate electron donor to complete a catalytic cycle. of the location or absence of the CR, Prxs are classified into 2- This overview summarizes the status of studies on Prxs Cys, atypical 2-Cys, and 1-Cys Prx subfamilies (Chae et al., and relates the following 10 minireviews. 1994b; Rhee et al., 2001; Wood et al., 2003b). 2-Cys Prx en- 1 zymes are homodimeric and contain two conserved (CP and CR) cysteine residues per subunit. The CP–SOH reacts with the NOMENCLATURE CR–SH of the other subunit to form an intersubunit disulfide. In atypical 2-Cys PrxV, the CP–SOH reacts with the CR–SH of the As in all biology, acronyms are overwhelming in Prx literature.
    [Show full text]
  • Kinetic Approaches to Measuring Peroxiredoxin Reactivity
    Mol. Cells 2016; 39(1): 26-30 http://dx.doi.org/10.14348/molcells.2016.2325 Molecules and Cells http://molcells.org Established in 1990 Kinetic Approaches to Measuring Peroxiredoxin Reactivity Christine C. Winterbourn*, and Alexander V. Peskin Peroxiredoxins are ubiquitous thiol proteins that catalyse demonstrated surprisingly low reactivity with thiol reagents such the breakdown of peroxides and regulate redox activity in as iodoacetamide and other oxidants such as chloramines the cell. Kinetic analysis of their reactions is required in (Peskin et al., 2007) and it is clear that the low pKa of the active order to identify substrate preferences, to understand how site thiol is insufficient to confer the high peroxide reactivity. In molecular structure affects activity and to establish their fact, typical low molecular weight and protein thiolates react -1 -1 physiological functions. Various approaches can be taken, with H2O2 with a rate constant of 20 M s whereas values of including the measurement of rates of individual steps in Prxs are 105-106 fold higher (Winterbourn and Hampton, 2008). the reaction pathway by stopped flow or competitive kinet- An elegant series of structural and mutational studies (Hall et al., ics, classical enzymatic analysis and measurement of pe- 2010; Nakamura et al., 2010; Nagy et al., 2011) have shown roxidase activity. Each methodology has its strengths and that to get sufficient rate enhancement, it is necessary to acti- they can often give complementary information. However, vate the peroxide. As discussed in detail elsewhere (Hall et al., it is important to understand the experimental conditions 2010; 2011), this involves formation of a transition state in of the assay so as to interpret correctly what parameter is which hydrogen bonding of the peroxide to conserved Arg and being measured.
    [Show full text]
  • GPX4 at the Crossroads of Lipid Homeostasis and Ferroptosis Giovanni C
    REVIEW GPX4 www.proteomics-journal.com GPX4 at the Crossroads of Lipid Homeostasis and Ferroptosis Giovanni C. Forcina and Scott J. Dixon* formation of toxic radicals (e.g., R-O•).[5] Oxygen is necessary for aerobic metabolism but can cause the harmful The eight mammalian GPX proteins fall oxidation of lipids and other macromolecules. Oxidation of cholesterol and into three clades based on amino acid phospholipids containing polyunsaturated fatty acyl chains can lead to lipid sequence similarity: GPX1 and GPX2; peroxidation, membrane damage, and cell death. Lipid hydroperoxides are key GPX3, GPX5, and GPX6; and GPX4, GPX7, and GPX8.[6] GPX1–4 and 6 (in intermediates in the process of lipid peroxidation. The lipid hydroperoxidase humans) are selenoproteins that contain glutathione peroxidase 4 (GPX4) converts lipid hydroperoxides to lipid an essential selenocysteine in the enzyme + alcohols, and this process prevents the iron (Fe2 )-dependent formation of active site, while GPX5, 6 (in mouse and toxic lipid reactive oxygen species (ROS). Inhibition of GPX4 function leads to rats), 7, and 8 use an active site cysteine lipid peroxidation and can result in the induction of ferroptosis, an instead. Unlike other family members, GPX4 (PHGPx) can act as a phospholipid iron-dependent, non-apoptotic form of cell death. This review describes the hydroperoxidase to reduce lipid perox- formation of reactive lipid species, the function of GPX4 in preventing ides to lipid alcohols.[7,8] Thus,GPX4ac- oxidative lipid damage, and the link between GPX4 dysfunction, lipid tivity is essential to maintain lipid home- oxidation, and the induction of ferroptosis. ostasis in the cell, prevent the accumula- tion of toxic lipid ROS and thereby block the onset of an oxidative, iron-dependent, non-apoptotic mode of cell death termed 1.
    [Show full text]
  • Pregnancy Day By
    Pregnancy An illustrated DAY BY DAY daily countdown to motherhood, from conception to childbirth and beyond Consultant Editor Paula Amato, MD Adjunct Associate Professor Department of Obstetrics & Gynecology Oregon Health & Science University Editor-In-Chief Maggie Blott, MB BS PregnancyDAY BY DAY An illustrated daily countdown to motherhood, from conception to childbirth and beyond PregnancyDAY BY DAY Consultant Editor Paula Amato, MD Adjunct Associate Professor, Department of Obstetrics & Gynecology, Oregon Health & Science University Editor-In-Chief Maggie Blott, MB BS LONDON, NEW YORK, MUNICH, MELBOURNE, DELHI Project Editors Dawn Bates, Claire Cross Project Designers Emma Forge, Tom Forge, Peggy Sadler Senior Editors Andrea Bagg, Anne Yelland, Emma Woolf US Editors Shannon Beatty, Jane Perlmutter US Consultant Editors Lisa Fields, Patricia Bontekoe Senior Art Editors Sarah Ponder, Nicola Rodway, Liz Sephton Production Editor Ben Marcus Production Controller Alice Holloway Creative Technical Support Sonia Charbonnier Illustrators Debbie Maizels, Medi-Mation New Photography Ruth Jenkinson Art Direction for Photography Emma Forge Picture Researcher Sarah Smithies Managing Editors Esther Ripley, Penny Warren Managing Art Editors Glenda Fisher, Marianne Markham Publisher Peggy Vance Every effort has been made to ensure that the information in this book is complete and accurate. However, neither the publisher nor the author is engaged in rendering professional advice or services to the individual reader. The ideas, procedures, and suggestions contained in this book are not intended as a substitute for consultng with your health-care provider. All matters regarding the health of you and your baby require medical supervision. Neither the publishers nor the author shall be liable or responsible for any loss or damage allegedly arising from any information or suggestion in this book.
    [Show full text]
  • Hydrogen Peroxide Metabolism and Functions in Plants
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Open Research Exeter PROF. NICHOLAS SMIRNOFF (Orcid ID : 0000-0001-5630-5602) Article type : Commissioned Material - Tansley Review Hydrogen peroxide metabolism and functions in plants Nicholas Smirnoff and Dominique Arnaud Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, UK. Corresponding author: Nicholas Smirnoff [email protected]. +44 (0)1392 725168, ORCID: Article 0000-0001-5630-5602 Received: 10 April 2018 Accepted: 28 August 2018 Contents Summary I. Introduction II. Measuring and imaging hydrogen peroxide III. Hydrogen peroxide and superoxide toxicity IV. Production of hydrogen peroxide: enzymes and subcellular locations V. Hydrogen peroxide transport VI. Control of hydrogen peroxide concentration: how and where? VII. Metabolic functions of hydrogen peroxide VIII. Hydrogen peroxide signalling This article has been accepted for publication and undergone full peer review but has not Accepted been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/nph.15488 This article is protected by copyright. All rights reserved. IX. Where next? Acknowledgements References Summary H2O2 is produced, via superoxide and superoxide dismutase, by electron transport in chloroplasts and mitochondria, plasma membrane NADPH oxidases, peroxisomal oxidases, type III peroxidases and other apoplastic oxidases. Intracellular transport is facilitated by aquaporins and H2O2 is removed by catalase, peroxiredoxin, glutathione peroxidase-like enzymes and ascorbate peroxidase, all of which have cell compartment-specific isoforms. Apoplastic H2O2 influences cell expansion, development and defence by its involvement in type III peroxidase-mediated polymer cross-linking, lignification and, possibly, cell expansion via H2O2-derived hydroxyl radicals.
    [Show full text]