GRAS Notice 665, Lactoperoxidase System
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Elevated Hydrogen Peroxide and Decreased Catalase and Glutathione
Sullivan-Gunn and Lewandowski BMC Geriatrics 2013, 13:104 http://www.biomedcentral.com/1471-2318/13/104 RESEARCH ARTICLE Open Access Elevated hydrogen peroxide and decreased catalase and glutathione peroxidase protection are associated with aging sarcopenia Melanie J Sullivan-Gunn1 and Paul A Lewandowski2* Abstract Background: Sarcopenia is the progressive loss of skeletal muscle that contributes to the decline in physical function during aging. A higher level of oxidative stress has been implicated in aging sarcopenia. The current study aims to determine if the higher level of oxidative stress is a result of increased superoxide (O2‾ ) production by the NADPH oxidase (NOX) enzyme or decrease in endogenous antioxidant enzyme protection. Methods: Female Balb/c mice were assigned to 4 age groups; 6, 12, 18 and 24 months. Body weight and animal survival rates were recorded over the course of the study. Skeletal muscle tissues were collected and used to measure NOX subunit mRNA, O2‾ levels and antioxidant enzymes. Results: Key subunit components of NOX expression were elevated in skeletal muscle at 18 months, when sarcopenia was first evident. Increased superoxide dismutase 1 (SOD1) activity suggests an increase in O2‾ dismutation and this was further supported by elevated levels of hydrogen peroxide (H2O2) and decline in catalase and glutathione peroxidase (GPx) antioxidant protection in skeletal muscle at this time. NOX expression was also higher in skeletal muscle at 24 months, however this was coupled with elevated levels of O2‾ and a decline in SOD1 activity, compared to 6 and 12 months but was not associated with further loss of muscle mass. -
Peroxidase and NADPH-Cytochrome C Reductase Activity During Thyroid Hyperplasia and Involution
Peroxidase and NADPH-Cytochrome C Reductase Activity During Thyroid Hyperplasia and Involution KUNIHIRO YAMAMOTO AND LESLIE J. DEGROOT Thyroid Study Unit, Department of Medicine, University of Chicago, Chicago, Illinois 60637 ABSTRACT. The regulation of iodination was in- TSH injection, whether expressed per mg gland vestigated in male rats during physiological altera- weight, per mg protein, or per fxg DNA, suggesting tions in thyroid function. Thyroid hyperplasia was enzyme induction and cellular hypertrophy. Involu- Downloaded from https://academic.oup.com/endo/article/95/2/606/2618917 by guest on 30 September 2021 produced by giving 0.01% PTU in drinking water or tion by T4 administration caused a decrease in injection of TSH (2 USP U/day); involution was thyroid weight, DNA content, and enzyme activity per induced after PTU treatment by giving 3 fig L-T4/ml gland. The main reason for the decrease in enzyme in drinking water. Increase in activity of thyroid activity per gland was a diminution of cell numbers. peroxidase and NADPH-cytochrome c reductase per During thyroid hyperplasia and involution, perox- gland exceeded gains in thyroid weight and DNA idase and NADPH-cytochrome c reductase activity content early in hyperplasia, but increased essen- is regulated by TSH. During the onset of TSH tially in parallel manner during chronic PTU treat- action, peroxidase and NADPH-cytochrome c re- ment. Enzyme activity per /xg DNA increased to ductase increase to a greater extent than thyroid 155% of control after 4 days of PTU treatment, weight and DNA content, suggesting preferential decreased to 138% on the seventh day, and was at enzyme synthesis in addition to cell hypertrophy. -
Thyroid Peroxidase Antibody Is Associated with Plasma Homocysteine Levels in Patients with Graves’ Disease
Published online: 2018-07-02 Article Thieme Li Fang et al. Thyroid Peroxidase Antibody is … Exp Clin Endocrinol Diabetes 2018; 00: 00–00 Thyroid Peroxidase Antibody is Associated with Plasma Homocysteine Levels in Patients with Graves’ Disease Authors Fang Li1 * , Gulibositan Aji1 * , Yun Wang2, Zhiqiang Lu1, Yan Ling1 Affiliations ABSTRACT 1 Department of Endocrinology and Metabolism, Zhong- Purpose Homocysteine is associated with cardiovascular, shan Hospital, Fudan University, Shanghai, China inflammation and autoimmune diseases. Previous studies have 2 Department of Endocrinology and Metabolism, the shown that thyroid peroxidase antibody is associated with ho- Second Hospital of Shijiazhuang City, Shijiazhuang, mocysteine levels in hypothyroidism. The relationship between Hebei Province, China thyroid antibodies and homocysteine in hyperthyroidism re- mains unclear. In this study, we aimed to investigate the asso- Key words ciation of thyroid antibodies with homocysteine in patients human, cardiovascular risk, hyperthyroidism with Graves’ disease. Methods This was a cross-sectional study including 478 received 07.04.2018 Graves’ disease patients who were consecutively admitted and revised 10.05.2018 underwent radioiodine therapy. Homocysteine, thyroid hor- accepted 14.06.2018 mones, thyroid antibodies, glucose and lipids were measured. Results Patients with homocysteine levels above the median Bibliography were older and had unfavorable metabolic parameters com- DOI https://doi.org/10.1055/a-0643-4692 pared to patients with homocysteine levels below the median. Published online: 2.7.2018 Thyroglobulin antibody or thyroid peroxidase antibody was Exp Clin Endocrinol Diabetes 2020; 128: 8–14 associated with homocysteine levels (β = 0.56, 95 %CI 0.03- © J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · 1.08, p = 0.04; β = 0.75, 95 %CI 0.23-1.27, p = 0.005). -
MPO) in Inflammatory Communication
antioxidants Review The Enzymatic and Non-Enzymatic Function of Myeloperoxidase (MPO) in Inflammatory Communication Yulia Kargapolova * , Simon Geißen, Ruiyuan Zheng, Stephan Baldus, Holger Winkels * and Matti Adam Department III of Internal Medicine, Heart Center, Faculty of Medicine and University Hospital of Cologne, 50937 North Rhine-Westphalia, Germany; [email protected] (S.G.); [email protected] (R.Z.); [email protected] (S.B.); [email protected] (M.A.) * Correspondence: [email protected] (Y.K.); [email protected] (H.W.) Abstract: Myeloperoxidase is a signature enzyme of polymorphonuclear neutrophils in mice and humans. Being a component of circulating white blood cells, myeloperoxidase plays multiple roles in various organs and tissues and facilitates their crosstalk. Here, we describe the current knowledge on the tissue- and lineage-specific expression of myeloperoxidase, its well-studied enzymatic activity and incoherently understood non-enzymatic role in various cell types and tissues. Further, we elaborate on Myeloperoxidase (MPO) in the complex context of cardiovascular disease, innate and autoimmune response, development and progression of cancer and neurodegenerative diseases. Keywords: myeloperoxidase; oxidative burst; NETs; cellular internalization; immune response; cancer; neurodegeneration Citation: Kargapolova, Y.; Geißen, S.; Zheng, R.; Baldus, S.; Winkels, H.; Adam, M. The Enzymatic and Non-Enzymatic Function of 1. Introduction. MPO Conservation Across Species, Maturation in Myeloid Progenitors, Myeloperoxidase (MPO) in and its Role in Immune Responses Inflammatory Communication. Myeloperoxidase (MPO) is a lysosomal protein and part of the organism’s host-defense Antioxidants 2021, 10, 562. https:// system. MPOs’ pivotal function is considered to be its enzymatic activity in response to doi.org/10.3390/antiox10040562 invading pathogenic agents. -
Catalase and Oxidase Test
CATALASE TEST Catalase is the enzyme that breaks hydrogen peroxide (H 2O2) into H 2O and O 2. Hydrogen peroxide is often used as a topical disinfectant in wounds, and the bubbling that is seen is due to the evolution of O 2 gas. H 2O2 is a potent oxidizing agent that can wreak havoc in a cell; because of this, any cell that uses O 2 or can live in the presence of O 2 must have a way to get rid of the peroxide. One of those ways is to make catalase. PROCEDURE a. Place a small amount of growth from your culture onto a clean microscope slide. If using colonies from a blood agar plate, be very careful not to scrape up any of the blood agar— blood cells are catalase positive and any contaminating agar could give a false positive. b. Add a few drops of H 2O2 onto the smear. If needed, mix with a toothpick. DO NOT use a metal loop or needle with H 2O2; it will give a false positive and degrade the metal. c. A positive result is the rapid evolution of O 2 as evidenced by bubbling. d. A negative result is no bubbles or only a few scattered bubbles. e. Dispose of your slide in the biohazard glass disposal container. Dispose of any toothpicks in the Pipet Keeper. OXIDASE TEST Basically, this is a test to see if an organism is an aerobe. It is a check for the presence of the electron transport chain that is the final phase of aerobic respiration. -
Thyroid Surgery for Patients with Hashimoto's Disease
® Clinical Thyroidology for the Public VOLUME 12 | ISSUE 7 | JULY 2019 HYPOTHYROIDISM Thyroid surgery for patients with Hashimoto’s disease BACKGROUND SUMMARY OF THE STUDY Hypothyroidism, or an underactive thyroid, is a common This study enrolled patients with hypothyroidism due to problem. In the United States, the most common cause Hashimoto’s thyroiditis who received treatment with thy- of hypothyroidism is Hashimoto’s thyroiditis. This is an roidectomy and thyroid hormone replacement or thyroid autoimmune disorder where antibodies attack the thyroid, hormone replacement alone. The outcome of the study causing inflammation and destruction of the gland. Char- was a patient-reported health score on the generic Short acteristic of Hashimoto’s thyroiditis are high antibodies Form-36 Health Survey (SF-36) after 18 months. to thyroid peroxidase (TPO Ab) on blood tests. Hypo- thyroidism is treated by thyroid hormone and returning Patients were in the age group of 18 to 79 years. They all thyroid hormone levels to the normal range usually had a TPOAb titer >1000 IU/L and reported persistent resolves symptoms in most patients. symptoms despite having normal thyroid hormone levels based on blood tests. Typical symptoms included fatigue, However, in some patients, symptoms may persist despite increased need for sleep associated with reduced sleep what appears to be adequate treatment based on blood quality, joint and muscle tenderness, dry mouth, and dry tests of thyroid function. This raises the possibility that eyes. Follow up visits were done every 3 months for 18 some symptoms may be related to the autoimmune months and the thyroid hormone therapy was adjusted as condition itself. -
Myeloperoxidase Mediates Cell Adhesion Via the Αmβ2 Integrin (Mac-1, Cd11b/CD18)
Journal of Cell Science 110, 1133-1139 (1997) 1133 Printed in Great Britain © The Company of Biologists Limited 1997 JCS4390 Myeloperoxidase mediates cell adhesion via the αMβ2 integrin (Mac-1, CD11b/CD18) Mats W. Johansson1,*, Manuel Patarroyo2, Fredrik Öberg3, Agneta Siegbahn4 and Kenneth Nilsson3 1Department of Physiological Botany, University of Uppsala, Villavägen 6, S-75236 Uppsala, Sweden 2Microbiology and Tumour Biology Centre, Karolinska Institute, PO Box 280, S-17177 Stockholm, Sweden 3Department of Pathology, University of Uppsala, University Hospital, S-75185 Uppsala, Sweden 4Department of Clinical Chemistry, University of Uppsala, University Hospital, S-75185 Uppsala, Sweden *Author for correspondence (e-mail: [email protected]) SUMMARY Myeloperoxidase is a leukocyte component able to to αM (CD11b) or to β2 (CD18) integrin subunits, but not generate potent microbicidal substances. A homologous by antibodies to αL (CD11a), αX (CD11c), or to other invertebrate blood cell protein, peroxinectin, is not only integrins. Native myeloperoxidase mediated dose- a peroxidase but also a cell adhesion ligand. We demon- dependent cell adhesion down to relatively low concen- strate in this study that human myeloperoxidase also trations, and denaturation abolished the adhesion mediates cell adhesion. Both the human myeloid cell line activity. It is evident that myeloperoxidase supports cell HL-60, when differentiated by treatment with 12-O- adhesion, a function which may be of considerable tetradecanoyl-phorbol-13-acetate (TPA) or retinoic acid, importance for leukocyte migration and infiltration in and human blood leukocytes, adhered to myeloperoxi- inflammatory reactions, that αMβ2 integrin (Mac-1 or dase; however, undifferentiated HL-60 cells showed only CD11b/CD18) mediates this adhesion, and that the αMβ2 minimal adhesion. -
Lncrna-MEG3 Functions As Ferroptotic Promoter to Mediate OGD Combined High Glucose-Induced Death of Rat Brain Microvascular Endothelial Cells Via the P53-GPX4 Axis
LncRNA-MEG3 functions as ferroptotic promoter to mediate OGD combined high glucose-induced death of rat brain microvascular endothelial cells via the p53-GPX4 axis Cheng Chen Xiangya Hospital Central South University Yan Huang Xiangya Hospital Central South University Pingping Xia Xiangya Hospital Central South University Fan Zhang Xiangya Hospital Central South University Longyan Li Xiangya Hospital Central South University E Wang Xiangya Hospital Central South University Qulian Guo Xiangya Hospital Central South University Zhi Ye ( [email protected] ) Xiangya Hospital Central South University https://orcid.org/0000-0002-7678-0926 Research article Keywords: lncRNA-MEG3, p53, ferroptosis, ischemia, GPX4, OGD, hyperglycemia, Posted Date: May 18th, 2020 DOI: https://doi.org/10.21203/rs.3.rs-28622/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Page 1/21 Abstract Background Individuals with diabetes are exposed to a higher risk of perioperative stroke than non- diabetics mainly due to persistent hyperglycemia. lncRNA-MEG3 (long non-coding RNA maternally expressed gene 3) has been considered as an important mediator in regulating ischemic stroke. However, the functional and regulatory roles of lncRNA-MEG3 in diabetic brain ischemic injury remain unclear. Results In this study, RBMVECs (the rat brain microvascular endothelial cells) were exposed to 6 h of OGD (oxygen and glucose deprivation), and subsequent reperfusion via incubating cells with glucose of various high concentrations for 24 h to imitate in vitro diabetic brain ischemic injury. It was shown that the marker events of ferroptosis and increased lncRNA-MEG3 expression occurred after the injury induced by OGD combined with hyperglycemic treatment. -
Peroxygenase Enzymatic Activity in Plants: Ginger, Rutabaga, And
Team New Groove February 14, 2020 BIOL 495-067 Dr. Gregory Raner Research Week 2020 Abstract Title: Peroxygenase Enzymatic Activity in Plants: Ginger and Jalapeno Peppers Program of Study: Biochemistry Presentation Type: Physical Poster Subtype Oral Presentation Type: Basic Mentor(s) and Mentor Email: Dr. Gregory Raner ([email protected]) Student(s) Name(s) and Email(s): Myles Robison ([email protected]) Mason Wolk ([email protected]) Dylan Taylor ([email protected]) Abstract: Peroxidases are a ubiquitous class of enzymes found in plants fungi and other higher organisms that catalyze chemical oxidations using hydrogen peroxide as an oxidant. They are useful in a number of industrial and biotechnological applications where non-selective oxidations are required. Though a number of plant peroxidases are known, much of the focused research has occurred with a single member from this family, horseradish peroxidase. Consequently, there is an incredibly rich diversity still available for discovery in the peroxidase world, with potentially novel industrial application. The long-range objective of the research described herein is to explore a very broad range of plant sources for isolation and characterization of novel peroxidase enzymes, with enzymatic characteristics that have previously been undiscovered. Sources selected for this study include skin samples from the root of ginger, root of rutabaga, and the seeds isolated from a variety of peppers of varying pungency on the Scoville scale. Crude preparations of the peroxidases have been accomplished through crushing of the tissue with a mortar and pestle in the presence of buffer, followed by high-speed centrifugation to remove plant debris. Activity was initially screened using the enzymatic conversion of guaiacol into tetraguaiacol in the presence of H2O2. -
The Molecular Mechanism of the Catalase-Like Activity In
Article pubs.acs.org/JACS The Molecular Mechanism of the Catalase-like Activity in Horseradish Peroxidase † ∥ † ‡ ‡ § Pablo Campomanes, , Ursula Rothlisberger, Mercedes Alfonso-Prieto,*, and Carme Rovira*, , † Laboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fedéralé de Lausanne (EPFL), CH-1015 Lausanne, Switzerland ‡ Departament de Química Organicà & Institut de Química Teoricà i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franques̀ 1, 08208 Barcelona, Spain § InstitucióCatalana de Recerca i Estudis Avancatş (ICREA), Passeig Lluís Companys, 23, 08018 Barcelona, Spain *S Supporting Information ABSTRACT: Horseradish peroxidase (HRP) is one of the most relevant peroxidase enzymes, used extensively in immunochemistry and biocatalysis applications. Unlike the closely related catalase enzymes, it exhibits a low activity to disproportionate hydrogen peroxide (H2O2). The origin of this disparity remains unknown due to the lack of atomistic information on the catalase-like reaction in HRP. Using QM(DFT)/MM metadynamics simulations, we uncover the mechanism for reduction of the HRP Compound I intermediate by H2O2 at atomic detail. The reaction begins with a hydrogen atom transfer, forming a peroxyl radical and a Compound II-like species. Reorientation of the peroxyl radical in the active site, concomitant with the transfer of the second hydrogen atom, is the rate-limiting step, with a computed free energy barrier (18.7 kcal/mol, ∼ 6 kcal/mol higher than the one obtained for catalase) in good agreement with experiments. Our simulations reveal the crucial role played by the distal pocket residues in accommodating H2O2, enabling formation of a Compound II-like intermediate, similar to catalases. However, out of the two pathways for Compound II reduction found in catalases, only one is operative in HRP. -
Independent Evolution of Four Heme Peroxidase Superfamilies
Archives of Biochemistry and Biophysics xxx (2015) xxx–xxx Contents lists available at ScienceDirect Archives of Biochemistry and Biophysics journal homepage: www.elsevier.com/locate/yabbi Independent evolution of four heme peroxidase superfamilies ⇑ Marcel Zámocky´ a,b, , Stefan Hofbauer a,c, Irene Schaffner a, Bernhard Gasselhuber a, Andrea Nicolussi a, Monika Soudi a, Katharina F. Pirker a, Paul G. Furtmüller a, Christian Obinger a a Department of Chemistry, Division of Biochemistry, VIBT – Vienna Institute of BioTechnology, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria b Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravská cesta 21, SK-84551 Bratislava, Slovakia c Department for Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, A-1030 Vienna, Austria article info abstract Article history: Four heme peroxidase superfamilies (peroxidase–catalase, peroxidase–cyclooxygenase, peroxidase–chlo- Received 26 November 2014 rite dismutase and peroxidase–peroxygenase superfamily) arose independently during evolution, which and in revised form 23 December 2014 differ in overall fold, active site architecture and enzymatic activities. The redox cofactor is heme b or Available online xxxx posttranslationally modified heme that is ligated by either histidine or cysteine. Heme peroxidases are found in all kingdoms of life and typically catalyze the one- and two-electron oxidation of a myriad of Keywords: organic and inorganic substrates. In addition to this peroxidatic activity distinct (sub)families show pro- Heme peroxidase nounced catalase, cyclooxygenase, chlorite dismutase or peroxygenase activities. Here we describe the Peroxidase–catalase superfamily phylogeny of these four superfamilies and present the most important sequence signatures and active Peroxidase–cyclooxygenase superfamily Peroxidase–chlorite dismutase superfamily site architectures. -
SUPPLEMENTARY DATA Supplementary Figure 1. The
SUPPLEMENTARY DATA Supplementary Figure 1. The results of Sirt1 activation in primary cultured TG cells using adenoviral system. GFP expression served as the control (n = 4 per group). Supplementary Figure 2. Two different Sirt1 activators, SRT1720 (0.5 µM or 1 µM ) and RSV (1µM or 10µM), induced the upregulation of Sirt1 in the primary cultured TG cells (n = 4 per group). ©2016 American Diabetes Association. Published online at http://diabetes.diabetesjournals.org/lookup/suppl/doi:10.2337/db15-1283/-/DC1 SUPPLEMENTARY DATA Supplementary Table 1. Primers used in qPCR Gene Name Primer Sequences Product Size (bp) Sirt1 F: tgccatcatgaagccagaga 241 (NM_001159589) R: aacatcgcagtctccaagga NOX4 F: tgtgcctttattgtgcggag 172 (NM_001285833.1) R: gctgatacactggggcaatg Supplementary Table 2. Antibodies used in Western blot or Immunofluorescence Antibody Company Cat. No Isotype Dilution Sirt1 Santa Cruz * sc-15404 Rabbit IgG 1/200 NF200 Sigma** N5389 Mouse IgG 1/500 Tubulin R&D# MAB1195 Mouse IgG 1/500 NOX4 Abcam† Ab133303 Rabbit IgG 1/500 NOX2 Abcam Ab129068 Rabbit IgG 1/500 phospho-AKT CST‡ #4060 Rabbit IgG 1/500 EGFR CST #4267 Rabbit IgG 1/500 Ki67 Santa Cruz sc-7846 Goat IgG 1/500 * Santa Cruz Biotechnology, Santa Cruz, CA, USA ** Sigma aldrich, Shanghai, China # R&D Systems Inc, Minneapolis, MN, USA † Abcam, Inc., Cambridge, MA, USA ‡ Cell Signaling Technology, Inc., Danvers, MA, USA ©2016 American Diabetes Association. Published online at http://diabetes.diabetesjournals.org/lookup/suppl/doi:10.2337/db15-1283/-/DC1 SUPPLEMENTARY DATA Supplementary