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The Food Poisoning Toxins of Bacillus Cereus
toxins Review The Food Poisoning Toxins of Bacillus cereus Richard Dietrich 1,†, Nadja Jessberger 1,*,†, Monika Ehling-Schulz 2 , Erwin Märtlbauer 1 and Per Einar Granum 3 1 Department of Veterinary Sciences, Faculty of Veterinary Medicine, Ludwig Maximilian University of Munich, Schönleutnerstr. 8, 85764 Oberschleißheim, Germany; [email protected] (R.D.); [email protected] (E.M.) 2 Department of Pathobiology, Functional Microbiology, Institute of Microbiology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria; [email protected] 3 Department of Food Safety and Infection Biology, Faculty of Veterinary Medicine, Norwegian University of Life Sciences, P.O. Box 5003 NMBU, 1432 Ås, Norway; [email protected] * Correspondence: [email protected] † These authors have contributed equally to this work. Abstract: Bacillus cereus is a ubiquitous soil bacterium responsible for two types of food-associated gastrointestinal diseases. While the emetic type, a food intoxication, manifests in nausea and vomiting, food infections with enteropathogenic strains cause diarrhea and abdominal pain. Causative toxins are the cyclic dodecadepsipeptide cereulide, and the proteinaceous enterotoxins hemolysin BL (Hbl), nonhemolytic enterotoxin (Nhe) and cytotoxin K (CytK), respectively. This review covers the current knowledge on distribution and genetic organization of the toxin genes, as well as mechanisms of enterotoxin gene regulation and toxin secretion. In this context, the exceptionally high variability of toxin production between single strains is highlighted. In addition, the mode of action of the pore-forming enterotoxins and their effect on target cells is described in detail. The main focus of this review are the two tripartite enterotoxin complexes Hbl and Nhe, but the latest findings on cereulide and CytK are also presented, as well as methods for toxin detection, and the contribution of further putative virulence factors to the diarrheal disease. -
Substances That Target Tumor Metabolism
Biomedical Research 2011; 22 (2): 132-166 1181_On the metabolic origin of cancer: substances that target tumor metabolism. Maurice Israël 1 and Laurent Schwartz 2 1Biorebus 38 rue de Bassano 75008 Paris ; and 2 Av Aristide Briand 91440 Bures sur Yvette. France. 2LIX : Ecole Polytechnique Palaiseau France ; and Hôpital Pitié- Salpêtrière, service de radiothérapie, 75013 Paris. Abstract. Work from our group and others clearly suggest the key role of altered metabolism in cancer. The goal of this review is to summarize current knowledge on cancer metabolism, draw hy- pothesis explaining metabolic alterations and associated gene changes. Most importantly, we indicate a list of possible pharmacological targets. In short, tumor metabolism displays mixed glycolysis and neoglucogenesis features; most glycolitic enzymes are activate, but the pyruvate kinase and the pyruvate deshydrogenase are inhibited. This would result from an activation of their specific kinases, or from the inactivation of phosphatases, such as PP2A, regulated by me- thylation. In parallel, the phosphatase failure would enhance “tyrosine kinase receptor” signals, as occurs with oncogenes. Such signaling pathways are similar to those activated by insuline, or IGF- Growth hormone; they control mitosis, cell survival, carbohydrate metabolism. If for some reason, their regulation fails (oncogenes, PP2A methylation deficit, enhanced kinases…) a typical tumor metabolism starts the carcinogenic process. We also describe changes in the citric acid- urea cycles, polyamines, and show how body stores feed tumor metabolic pathways above and below “bottlenecks” resulting from wrongly switched enzymes. Studying the available lit- erature, we list a number of medications that target enzymes that are essential for tumor cells. -
Ranking of Substances for Monitoring in Foods, Drinks and Dietary Supplements - Based on Risk and Knowledge Gaps
VKM Report 2019: 13 Ranking of substances for monitoring in foods, drinks and dietary supplements - based on risk and knowledge gaps Scientific Opinion of the Scientific Steering Committee of the Norwegian Scientific Committee for Food and Environment Scientific Opinion of the Scientific Steering Committee of the Norwegian Scientific Committee for Food and Environment 16.09.2019 ISBN: 978-82-8259-329-8 ISSN: 2535-4019 Norwegian Scientific Committee for Food and Environment (VKM) Po 222 Skøyen N – 0213 Oslo Norway Phone: +47 21 62 28 00 Email: [email protected] vkm.no vkm.no/english Cover photo: Brace Suggested citation: VKM, Inger-Lise Steffensen, Christiane Kruse Fæste, Trine Husøy, Helle Katrine Knutsen, Gro Haarklou Mathisen, Robin Ørnsrud, Angelika Agdestein, Johanna Bodin, Edel Elvevoll, Dag O. Hessen, Merete Hofshagen, Åshild Krogdahl, Asbjørn Magne Nilsen, Trond Rafoss, Taran Skjerdal, Gaute Velle, Yngvild Wasteson, Gro-Ingunn Hemre, Vigdis Vandvik, Jan Alexander (2019). Ranking of substances for monitoring in foods, drinks and dietary supplements - based on risk and knowledge gaps. Scientific Opinion of the Scientific Steering Committee of the Norwegian Scientific Committee for Food and Environment. VKM report 2019:13, ISBN: 978-82-8259-329-8, ISSN: 2535-4019. VKM Report 2019: 13 Ranking of substances for monitoring in foods, drinks and dietary supplements - based on risk and knowledge gaps Preparation of the opinion The Norwegian Scientific Committee for Food and Environment (Vitenskapskomiteen for mat og miljø, VKM) appointed a project group to answer the request from the Norwegian Food Safety Authority. The project group consisted of six VKM members and a project leader from the VKM secretariat. -
Alternaria Alternata Toxins Synergistically Activate the Aryl Hydrocarbon Receptor Pathway in Vitro
biomolecules Article Alternaria alternata Toxins Synergistically Activate the Aryl Hydrocarbon Receptor Pathway In Vitro Julia Hohenbichler 1 , Georg Aichinger 1 , Michael Rychlik 2 , Giorgia Del Favero 1 and Doris Marko 1,* 1 Department of Food Chemistry and Toxicology, University of Vienna, 1090 Vienna, Italy; [email protected] (J.H.); [email protected] (G.A.); [email protected] (G.D.F.) 2 Chair of Analytical Chemistry, Technical University of Munich, 80333 Munich, Germany; [email protected] * Correspondence: [email protected] Received: 18 June 2020; Accepted: 30 June 2020; Published: 9 July 2020 Abstract: Alternaria molds simultaneously produce a large variety of mycotoxins, of which several were previously reported to induce enzymes of phase I metabolism through aryl hydrocarbon receptor activation. Thus, we investigated the potential of naturally occurring Alternaria toxin mixtures to induce Cytochrome P450 (CYP) 1A1/1A2/1B1 activity. Two variants of an extract from cultured Alternaria alternata, as well as the toxins alternariol (AOH), alternariol monomethyl ether (AME), altertoxin I (ATX-I), and altertoxin II (ATX-II), were tested singularly and in binary mixtures applying the 7-ethoxy-resorufin-O-deethylase (EROD) assay in MCF-7 breast cancer cells. Sub-cytotoxic concentrations of the two toxin mixtures, as well as ATX-I, ATX-II and AOH, exhibited dose-dependent enhancements of CYP 1 activity. ATX-I and ATX-II interacted synergistically in this respect, demonstrating the two perylene quinones as major contributors to the extract’s potential. Binary mixtures between AOH and the two altertoxins respectively exhibited concentration-dependent antagonistic as well as synergistic combinatory effects. -
New Markers in the Mycotox Profile
New Markers in the MycoTOX Profile We are happy to announce the addition of four new mycotoxin markers to our MycoTOX Profile. The test now includes 11 mycotoxins from 40 species of mold, making it by far the most comprehensive and competitively priced mycotoxin test available. It also still more sensitive and accurate than other tests available, because we use LC/MS/MS technology. Here is an overview of the four new mycotoxin markers: Gliotoxin Gliotoxin (GTX) is produced by the mold genus Aspergillus. Aspergillus spreads in the environment by releasing conidia which are capable of infiltrating the small alveolar airways of individuals. In order to evade the body’s defenses Aspergillus releases Gliotoxin to inhibit the immune system. One of the targets of Gliotoxin is PtdIns (3,4,5) P3. This results in the downregulation of phagocytic immune defense, which can lead to the exacerbation of polymicrobial infections. Gliotoxin impairs the activation of T-cells and induces apoptosis in monocytes and in monocyte-derived dendritic cells. These impairments can lead to multiple neurological syndromes. Mycophenolic Acid Mycophenolic Acid (MPA) produced by the Penicillium fungus. MPA is an immunosuppressant which inhibits the proliferation of B and T lymphocytes. MPA exposure can increase the risk of opportunistic infections such as Clostridia and Candida. MPA is associated with miscarriage and congenital malformations when the woman is exposed in pregnancy. Dihydrocitrinone Dihydrocitrinone is a metabolite of Citrinin (CTN), which is a mycotoxin that is produced by the mold species Aspergillus, Penicillium, and Monascus. CTN exposure can lead to nephropathy, because of its ability to increase permeability of mitochondrial membranes in the kidneys. -
Evaluation of the Individual and Combined Toxicity of Fumonisin Mycotoxins in Human Gastric Epithelial Cells
International Journal of Molecular Sciences Article Evaluation of the Individual and Combined Toxicity of Fumonisin Mycotoxins in Human Gastric Epithelial Cells Song Yu, Bingxuan Jia, Na Liu, Dianzhen Yu and Aibo Wu * SIBS-UGENT-SJTU Joint Laboratory of Mycotoxin Research, CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200031, China; [email protected] (S.Y.); [email protected] (B.J.); [email protected] (N.L.); [email protected] (D.Y.) * Correspondence: [email protected]; Tel.: +86-21-54920716 Received: 23 July 2020; Accepted: 14 August 2020; Published: 18 August 2020 Abstract: Fumonisin contaminates food and feed extensively throughout the world, causing chronic and acute toxicity in human and animals. Currently, studies on the toxicology of fumonisins mainly focus on fumonisin B1 (FB1). Considering that FB1, fumonisin B2 (FB2) and fumonisin B3 (FB3) could coexist in food and feed, a study regarding a single toxin, FB1, may not completely reflect the toxicity of fumonisin. The gastrointestinal tract is usually exposed to these dietary toxins. In our study, the human gastric epithelial cell line (GES-1) was used as in vitro model to evaluate the toxicity of fumonisin. Firstly, we found that they could cause a decrease in cell viability, and increase in membrane leakage, cell death and the induction of expression of markers for endoplasmic reticulum (ER) stress. Their toxicity potency rank is FB1 > FB2 >> FB3. The results also showed that the synergistic effect appeared in the combinations of FB1 + FB2 and FB1 + FB3. -
(Danio Rerio). (In Vivo/ in Vitro
Lire la première partie de la thèse IV. Métabolisme de la BP2 et du BPS dans des modèles in vitro issus de l’Homme et du poisson zèbre utilisés dans l’évaluation toxicologique et le criblage des substances à activité œstrogénique Article 3 Cell-specific biotransformation of benzophenone 2 and Bisphenol-S in zebrafish and human in vitro models used for toxicity and estrogenicity screening Vincent Le Fola,b,c, Selim Aït-Aïssaa,*, Nicolas Cabatonb,c, Laurence Dolob,c, Marina Grimaldid, Patrick Balaguerd, Elisabeth Perdub,c, Laurent Debrauwerb,c, François Briona, Daniel Zalkob,c,* a Institut National de l’Environnement Industriel et des Risques (INERIS), Unité Écotoxicologie in vitro et in vivo, F-60550 Verneuil-en-Halatte, France b INRA, UMR1331, Toxalim, Research Centre in Food Toxicology, F-31027 Toulouse, France c Toulouse University, INP, UMR 1331 TOXALIM, F-31000 Toulouse, France. d Institut de Recherche en Cancérologie de Montpellier, Institut National de la Santé et de la Recherche Médicale U896, Institut Régional de Cancérologie de Montpellier, Université Montpellier 1, F-34298 Montpellier, France. * corresponding authors: E-mail: [email protected], phone +33 561 285 004, fax +33 561 285 244 E-mail: [email protected], phone +33 344 556 511, fax +33 344 556 767 185 L’étude du devenir de la BP2 et du BPS dans différents modèles in vitro du poisson zèbre fait suite à la mise en évidence des différences de réponse œstrogénique observées entre les modèles cellulaires, larvaires et adultes. En complément de ces modèles poisson zèbre, cette étude de devenir de la BP2 et du BPS a également été conduite dans des modèles in vitro humain d’origine hépatique ou mammaire et couramment utilisés dans l’évaluation toxicologique du potentiel œstrogénique des xénobiotiques. -
Natural Products As Alternative Choices for P-Glycoprotein (P-Gp) Inhibition
Review Natural Products as Alternative Choices for P-Glycoprotein (P-gp) Inhibition Saikat Dewanjee 1,*, Tarun K. Dua 1, Niloy Bhattacharjee 1, Anup Das 2, Moumita Gangopadhyay 3, Ritu Khanra 1, Swarnalata Joardar 1, Muhammad Riaz 4, Vincenzo De Feo 5,* and Muhammad Zia-Ul-Haq 6,* 1 Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Raja S C Mullick Road, Kolkata 700032, India; [email protected] (T.K.D.); [email protected] (N.B.); [email protected] (R.K.); [email protected] (S.J.) 2 Department of Pharmaceutical Technology, ADAMAS University, Barasat, Kolkata 700126, India; [email protected] 3 Department of Bioechnology, ADAMAS University, Barasat, Kolkata 700126, India; [email protected] 4 Department of Pharmacy, Shaheed Benazir Bhutto University, Sheringal 18050, Pakistan; [email protected] 5 Department of Pharmacy, Salerno University, Fisciano 84084, Salerno, Italy 6 Environment Science Department, Lahore College for Women University, Jail Road, Lahore 54600, Pakistan * Correspondence: [email protected] (S.D.); [email protected] (V.D.F.); [email protected] (M.Z.-U.-H.) Academic Editor: Maria Emília de Sousa Received: 11 April 2017; Accepted: 15 May 2017; Published: 25 May 2017 Abstract: Multidrug resistance (MDR) is regarded as one of the bottlenecks of successful clinical treatment for numerous chemotherapeutic agents. Multiple key regulators are alleged to be responsible for MDR and making the treatment regimens ineffective. In this review, we discuss MDR in relation to P-glycoprotein (P-gp) and its down-regulation by natural bioactive molecules. P-gp, a unique ATP-dependent membrane transport protein, is one of those key regulators which are present in the lining of the colon, endothelial cells of the blood brain barrier (BBB), bile duct, adrenal gland, kidney tubules, small intestine, pancreatic ducts and in many other tissues like heart, lungs, spleen, skeletal muscles, etc. -
Pdf; Chi 2015 DPP Air in Cars.Pdf; Dodson 2014 DPP Dust CA.Pdf; Kasper-Sonnenberg 2014 Phth Metabolites.Pdf; EU Cosmetics Regs 2009.Pdf
Bouge, Cathy (ECY) From: Nancy Uding <[email protected]> Sent: Friday, January 13, 2017 10:24 AM To: Steward, Kara (ECY) Cc: Erika Schreder Subject: Comments re. 2016 CSPA Rule Update - DPP Attachments: DPP 131-18-0 exposure.pdf; Chi 2015 DPP air in cars.pdf; Dodson 2014 DPP dust CA.pdf; Kasper-Sonnenberg 2014 phth metabolites.pdf; EU Cosmetics Regs 2009.pdf Please accept these comments from Toxic-Free Future concerning the exposure potential of DPP for consideration during the 2016 CSPA Rule update. Regards, Nancy Uding -- Nancy Uding Grants & Research Specialist Toxic-Free Future 206-632-1545 ext.123 http://toxicfreefuture.org 1 JES-00888; No of Pages 9 JOURNAL OF ENVIRONMENTAL SCIENCES XX (2016) XXX– XXX Available online at www.sciencedirect.com ScienceDirect www.elsevier.com/locate/jes Determination of 15 phthalate esters in air by gas-phase and particle-phase simultaneous sampling Chenchen Chi1, Meng Xia1, Chen Zhou1, Xueqing Wang1,2, Mili Weng1,3, Xueyou Shen1,4,⁎ 1. College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China 2. Zhejiang National Radiation Environmental Technology Co., Ltd., Hangzhou 310011, China 3. School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 310058, China 4. Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China ARTICLE INFO ABSTRACT Article history: Based on previous research, the sampling and analysis methods for phthalate esters (PAEs) Received 24 December 2015 were improved by increasing the sampling flow of indoor air from 1 to 4 L/min, shortening the Revised 14 January 2016 sampling duration from 8 to 2 hr. -
Induktion, Regulation Und Latenz Von
Organisation and transcriptional regulation of the polyphenol oxidase (PPO) multigene family of the moss Physcomitrella patens (Hedw.) B.S.G. and functional gene knockout of PpPPO1 Dissertation zur Erlangung des Doktorgrades - Dr. rer. nat. - im Department Biologie der Fakultät Mathematik, Informatik und Naturwissenschaften an der Universität Hamburg von Hanna Richter Hamburg, Januar 2009 TABLE OF CONTENTS TABLE OF CONTENTS SUMMARY...................................................................................................................5 ZUSAMMENFASSUNG...............................................................................................6 1. INTRODUCTION ................................................................................................. 8 1.1. Polyphenol oxidases ................................................................................................................ 8 1.2. Phenolic compounds ............................................................................................................. 14 1.3. The model plant Physcomitrella patens ............................................................................... 15 1.4. Aim of this research ............................................................................................................... 19 2. MATERIALS AND METHODS .......................................................................... 20 2.1. Chemicals ............................................................................................................................... -
Flavonoid Glucodiversification with Engineered Sucrose-Active Enzymes Yannick Malbert
Flavonoid glucodiversification with engineered sucrose-active enzymes Yannick Malbert To cite this version: Yannick Malbert. Flavonoid glucodiversification with engineered sucrose-active enzymes. Biotechnol- ogy. INSA de Toulouse, 2014. English. NNT : 2014ISAT0038. tel-01219406 HAL Id: tel-01219406 https://tel.archives-ouvertes.fr/tel-01219406 Submitted on 22 Oct 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Last name: MALBERT First name: Yannick Title: Flavonoid glucodiversification with engineered sucrose-active enzymes Speciality: Ecological, Veterinary, Agronomic Sciences and Bioengineering, Field: Enzymatic and microbial engineering. Year: 2014 Number of pages: 257 Flavonoid glycosides are natural plant secondary metabolites exhibiting many physicochemical and biological properties. Glycosylation usually improves flavonoid solubility but access to flavonoid glycosides is limited by their low production levels in plants. In this thesis work, the focus was placed on the development of new glucodiversification routes of natural flavonoids by taking advantage of protein engineering. Two biochemically and structurally characterized recombinant transglucosylases, the amylosucrase from Neisseria polysaccharea and the α-(1→2) branching sucrase, a truncated form of the dextransucrase from L. Mesenteroides NRRL B-1299, were selected to attempt glucosylation of different flavonoids, synthesize new α-glucoside derivatives with original patterns of glucosylation and hopefully improved their water-solubility. -
Assessment of Grain Safety in Developing Nations
ASSESSMENT OF GRAIN SAFETY IN DEVELOPING NATIONS by José Rodrigo Mendoza Jiménez A DISSERTATION Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Doctor of Philosophy Major: Food Science & Technology Under the Supervision of Professors Andréia Bianchini and Jayne E. Stratton Lincoln, Nebraska December, 2020 ASSESSMENT OF GRAIN SAFETY IN DEVELOPING NATIONS José Rodrigo Mendoza Jiménez, Ph.D. University of Nebraska, 2020 Advisor: Andréia Bianchini Grains are the most widely consumed foods worldwide, with maize (Zea mays) being frequently consumed in developing countries where it feeds approximately 900 million people under the poverty line of 2 USD per day. While grain handling practices are acceptable in most developed nations, many developing nations still face challenges such as inadequate field management, drying, and storage. Faulty grain handling along with unavoidably humid climates result in recurrent fungal growth and spoilage, which compromises both the end-quality and safety of the harvest. This becomes particularly problematic where there is little awareness about health risks associated with poor quality grain. Fungi are contaminants of maize and some can produce toxins, known as mycotoxins, that both devalue crop marketability and have detrimental health effects, especially to those malnourished. As some households depend on their harvest for self- consumption, losses due to fungi endanger their food security. To abate the threat posed by mycotoxigenic fungi on maize among developing nations, this research was conducted as a compilation of works in several countries. More specifically, it describes agricultural practices currently in use in developing nations, provides an overview of mycotoxin prevalence and approaches that can be used to improve grain safety post-harvest through proper storage.