Relevance of N-Nitroso Compounds to Human Cancer: Exposures and Mechanisms

Total Page:16

File Type:pdf, Size:1020Kb

Relevance of N-Nitroso Compounds to Human Cancer: Exposures and Mechanisms WORLD HEALTH ORGANIZATION ' Ю INTERNATIONAL AGENCY FOR RESEARCH ON CANCER RELEVANCE OF N-NITROSO COMPOUNDS TO HUMAN CANCER: EXPOSURES AND MECHANISMS Proceedings of the IXth International Symposium on N-Nitroso Compounds, held in Baden, Austria, 1-5 SeptemЬеr 1986 Co-sponsored by: National Cancer Institute (USA) Dr M. Okada Giapan) and associated Japanese industrial sponsors Thermedics Inc. (USA) Ciba-Geigy (Switzerland) Imperial Chemical Industries (UK) EDITORS H. BARTSCH, T.K. 0 NЕILL & R. SCHULTE-HERMANN JAR SCIENTIFIC PUBLICATIONS NO. 84 INTERNATIONAL AGENCY FOR RESEARCH ON CANCER LYON 1987 CONTENTS Foreword.................................................................. 1 Introduction................................................................ 3 Overview................................................................... 5 Keynote address P.N. Magee ............................................................. 11 1. MOLECULAR AND BIOCHEMICAL MECHANISMS Biochemical events in nitrosamine-induced hepatocarcinogenesis: relevance of animal data to human carcinogenesis R.Schulte-Hermann .....................................................17 Biochemical and molecular effects of N-nitroso compounds in human cultured cells: an overview C.C. Harris .............................................................20 Activation of the human c-Ha-ras-1 proto-oncogene by in-vitro reaction with N-nitroso- methyl(acetoxymethyl)amine S. Hirani-Hojatti, J.R. Milligan & M.C. Archer ..............................26 Specificity of OЬ-alkylguanine-DNA alkyltransferase А.E. Pegg, D. 5сicсhitaпo, K. Morimoto & M.E. Dolan .......................30 Diet- and age-dependent modulation of O6-methylguanine-DNA methyltransferase levels in mouse tissues M. Klaudc & A. von der Decker ....... .....................................35 0-Alkyl deoxythyrnidines are recognized by DNA polymerase I as deoxythymidine or deoxycytidinc В. Singer, S.J. Spengler, F. Chavez, J. Sagi, J.T. Kusmierek, B.D. Preston & L.A. Loeb ............................................................37 Repair of synthetic oligonucleotides containing OЬ-methylguanine, O6-ethylguаnine and 04-methylthymiпe, by O6-alkylguanine-DNA alkyltransferase R.J. Graves, S.F.L. Li & P.F. Swann .......................................41 Synthesis and structural studies by nuclear magnetic resonance of dodecadeoxynucleotides containing OЬ-methylguanine, OЬ-еthylguапin arid 0'-methylthymine B.F.L. Li, P.F. Swann, M. Kalnik & D.J. Patel ..............................44 Organ specificity, metabolism and reaction with DNA of aliphatic nitrosomethyl- alkylamines P. Kleihues, E. von Hole, I. Schmerold, L.K. Keefer & W. Lijinsky .............49 Immunocytochemical studies on the formation and repair of O6-аlkylguaniпe in rat tissues E. Scherer, A.A.J. Jenner & L. Den Engelse .................................55 Molecular dosimetry of DNA alkylation during chronic exposure to carcinogens • J.A. Swenberg, J.A. Boucheron, F.H. Deal, F.C. Richardson & L.A. Tyeryar.....59 Long-term persistence of nitrosamine-induced structural damage to heterochromatic DNA B.W. 5tewart & E.J. Ward .............. o .................................64 N-Nitroso-N-methylaniline; possible mode of DNA modification S.R. Koepke, M.B. Kroeger-Koepke & C.J. Michejda .........................68 /3-Oxidized N-nitrosoalkylcarbamates as models for DNA alkylation by N-nitrosobis- (2-охорторуl)amine in Syrian hamsters D.L. Nagel, R. Lewis, M. Fischer, K. Stansbury, К. Ѕtерап & T.A. Lawson . .71 2. METABOLISM Recent findings on the metabolism of Р-hydroxyalkylпitrоsаmines С.J. Michejda, S.R. Koepke, M.B. Kroeger-Koepke & W. Bosan ...............77 In-vivo activation of N-nitrosodiethanolamine and other N-nitroso-2-hуdroxyalkуlamiпes by alcohol dehydrogenase and sulfotransferase E. Denkel, W. Sterzel & G. Eisenbrand ................................... ...83 Metabolism and cellular interactions of N-nitrosodiethanolamine J.G. Farrelly, B.J. Thomas & W. Lijinsky ...................................87 13-Oxidation of N-nitrosodiеthanolamine in different animal species in vitro and in vivo M. Bonfanti, C. Magagnotti, R. Fanelli & L. Airoldi ..........................91 o-Nitrosaminoaldehydes: highly reactive metabolites R.N. Loeppky, W. Tomasik, G. Eisenbrand & E. Denkel ......................94 Directly-acting mutagens formed from N-nitroso-N-(formylmethyl)alkylamines E. Suzuki, M. Osabe, M. Mochizuki & M. Okada ...........................100 Enzymatic mechanisms in the metabolic activation 0f N-nitrosodialkylamines C.S. Yang, C. Patten, M.J. Lee, M. Li, J.S.H. Yoo, J. Pan & J. Hong ..........104 Mechanism and control of denitrosation of N-nitrosodimethylamine H.-J. Haussmann & J. Werringloer ........................................109 Potential for metabolic deactivation of carcinogenic N-nitrosodimethylamine in vivo L.K. Keefer, T. Anjo, Y.-H. Heur, C.S. Yang & B.A. Mico .................... 113 Same aspects of cytochrome P450-dependent denitrosation of N-nitrosamines K.E. Appel, M. Schоеpkе, T. Scheрer, S. Gdrsdorf, M. Bauszus, C.S. Ruhl, R. Kramer, H.H. Ruf, B. Sрiegelhaldеr, M. Wiessler & A.G. Hildebrandt .................117 Kinetic isotope effect on the demethylation and denitrosation of N-nitrosodimctliylamine in vitro C.S. Yang, D. Wade, T. Anjo & L.K. Keefer ................................124 Structure-activity relationships in metabolism and mutagenicities of N-nitrosamines J.B. Guttenplan .........................................................129 The pig as an animal model for the study of nitrosamine metabolism G.W. Harrington, P.N. Magee, H.M. Pylypiw, Jr, R.F. Bevi11, D.R. Nelson & J.C. Thurmon ..........................................................132 The ferret as a model for endogenous synthesis and metabolism of N-nitrosamines J.S. Wishnok, S.R. Tannenbaum, J.G. Fox, J.E. Mesina & L.C. Hotahng.......135 Cell type-specific differences in metabolic activation of N-nitrosodiethylamine by human lung cancer cell lines H.M. Schuller, M. Falzon, A.F. Gazdar & T. Hegedus .......................138 A comparative study of the mutagenic activation of carcinogenic N-nitrosopropylamines by various animal species aid man Y. Mori, H. Yamazaki & Y. Konishi .......................................141 Metabolism of the oesophageal carcinogen N-nitrosomethylamylamine: changes with age, clearance from blood and DNA alkylation S.S. Mirvish, C. Ji, M. Makary, H.A.J. Schut & C. Krokos ...................144 Exhalation of N-nitrosoethylvinylamine after application of N-nitrosodicthylamine to Sprague-Dawley rats R.G. Klein, B. Schmezer, Р. Schmezer & B. 5piegelhalder .................... 148 Investigation into the pharmacodynamics of the carcinogen N-nitrodimethylamine M. Hassel, E. Frei, H.R. 5cherf & M. Wiessler ........ .................... 150 Urinary metabolites of N-nitrosodibutylamine in the rat: identification of N-acetyl-S-butyl- L-cysteine derivatives E. Suzuki, M. Osabe, M. Okada, T. Ishizaka & T. Suzuki ....................153 Extrahepatic microsomal metabolism of N-nitrosodi-n-butylamine in rats E. Richter, J. Schulze & W. Zwickenpflug ..................................156 Experimental model for investigating bladder carcinogen metabolism using the isolated rat urinary bladder L. Airoldi, M. Bor►fanti, C. Magagnotti & R. Fanelli ......................... 159 Could N-nitrosamino phosphates be transport forms of activated N-nitrosamines? N. Frank, M. Wiessler, B.L. Pool & E. Frei .................................162 Chemical and mutagenic properties of a-phosphonooxynitrosamines M. Mochizuki, A. lkarashi, A. Suzuki, N. Sekiguchi, Т. Anjo & M. Okada...... 165 aг-Glucuroпides of N-nitrosomethylbenzyla.mine M. Wiessler & G. Rossnagcl ..............................................170 Effect of ascorbic acid on the metabolism of N-nitrosopiperidine M. Nakamura, Y. Osada, Y. Horiguchi, T. Nakaoka, K. Ito & T. Kawabata .....173 Effect of (+)-catechin, dimethyl sulfoxide and ethanol on the microsome-mediated metabolism of two hepatocarcinogens. N-nitrosodimethylamine and aflatoxin B, H.R. Prasanna, P.D. Lotlikar, N. Hacobian, L.L. Ho & P.N. Magee ...........175 Effect of dietary selenium on biotransformation and excretion of mutagenic metabolites of N-nitrosodimethylamine and 1,1-dimethylhydrazine in the liver perfusion cell culture system B. Beije, U. Olsson & A. (unfelt ...........................................178 Different effects of chemicals on metabolism of N nitrosamines in rat liver T. Kawanishi, Y. Ohno, A. Takahashi, A. Takanaka & Y. Iron. ..............181 Effect of butylated hydroxyanisole on the metabolism of N-nitrosodi-n-butylamine and N-nitrosobutyl(4-hydroxybutyl)amine by rat hepatic S9 preparations in vitro R. Рastorelli, A. Ancidei, R. Fanelli & L. Airoldi ............................183 3. REACTION WITH MACROMOLECULES Formation and fate of nucleic acid and protein adducts derived from N-uitroso-bile acid conjugates D.E.G. Shuker, J.R. Howell & B.W. Street .................................187 A method to determine the carbamoylating potential of 1-(2-chloroethyl)-I-nitrosoureas W. Stahl, R.L. Krauth-Siegel, R.H. Schirmer & G. Eiscnbrand ................191 Alkylation of 2'-deoxythymidylyl-(3'л5)-2'-deoxythymidine with 2-hydroxyethylпitroso- итеа and stability of the resulting phosphotriester N. 1011er, J. Conrad & G. Eisenbrand ...............................:.....194 Mechanism of inhibition of N-methyl-N-nitrosourea-induced mutagenicity and DNA binding by ellagic acid R. Dixit & B. Gold ......................................................197
Recommended publications
  • 2016 Bill No. CS for SB 1528 Ì460300XÎ460300
    Florida Senate - 2016 PROPOSED COMMITTEE SUBSTITUTE Bill No. CS for SB 1528 460300 Ì460300XÎ 576-03397-16 Proposed Committee Substitute by the Committee on Appropriations (Appropriations Subcommittee on Criminal and Civil Justice) 1 A bill to be entitled 2 An act relating to illicit drugs; amending s. 893.02, 3 F.S.; defining terms; deleting a definition; revising 4 definitions; amending s. 893.03, F.S.; providing that 5 class designation is a way to reference scheduled 6 controlled substances; adding, deleting, and revising 7 the list of Schedule I controlled substances; revising 8 the list of Schedule III anabolic steroids; amending 9 s. 893.033, F.S.; adding, deleting, and revising the 10 list of precursor and essential chemicals; amending s. 11 893.0356, F.S.; defining the term “substantially 12 similar”; deleting the term “potential for abuse”; 13 requiring that a controlled substance analog be 14 treated as the highest scheduled controlled substance 15 of which it is an analog; amending s. 893.13, F.S.; 16 creating a noncriminal penalty for selling, 17 manufacturing, or delivering, or possessing with 18 intent to sell, manufacture, or deliver any unlawful 19 controlled substance in, on, or near an assisted 20 living facility; creating a criminal penalty for a 21 person 18 years of age or older who delivers to a 22 person younger than 18 years of age any illegal 23 controlled substance, who uses or hires a person 24 younger than 18 years of age in the sale or delivery 25 of such substance, or who uses a person younger than 26 18 years of age to assist in avoiding detection for 27 specified violations; deleting a criminal penalty for Page 1 of 197 2/12/2016 8:29:32 AM Florida Senate - 2016 PROPOSED COMMITTEE SUBSTITUTE Bill No.
    [Show full text]
  • Detailed Review Paper on Retinoid Pathway Signalling
    1 1 Detailed Review Paper on Retinoid Pathway Signalling 2 December 2020 3 2 4 Foreword 5 1. Project 4.97 to develop a Detailed Review Paper (DRP) on the Retinoid System 6 was added to the Test Guidelines Programme work plan in 2015. The project was 7 originally proposed by Sweden and the European Commission later joined the project as 8 a co-lead. In 2019, the OECD Secretariat was added to coordinate input from expert 9 consultants. The initial objectives of the project were to: 10 draft a review of the biology of retinoid signalling pathway, 11 describe retinoid-mediated effects on various organ systems, 12 identify relevant retinoid in vitro and ex vivo assays that measure mechanistic 13 effects of chemicals for development, and 14 Identify in vivo endpoints that could be added to existing test guidelines to 15 identify chemical effects on retinoid pathway signalling. 16 2. This DRP is intended to expand the recommendations for the retinoid pathway 17 included in the OECD Detailed Review Paper on the State of the Science on Novel In 18 vitro and In vivo Screening and Testing Methods and Endpoints for Evaluating 19 Endocrine Disruptors (DRP No 178). The retinoid signalling pathway was one of seven 20 endocrine pathways considered to be susceptible to environmental endocrine disruption 21 and for which relevant endpoints could be measured in new or existing OECD Test 22 Guidelines for evaluating endocrine disruption. Due to the complexity of retinoid 23 signalling across multiple organ systems, this effort was foreseen as a multi-step process.
    [Show full text]
  • Mice Exposed to N-Ethyl-N-Nitrosourea T
    Proc. Nati. Acad. Sci. USA Vol. 89, pp. 7866-7870, September 1992 Genetics Mutational spectrum at the Hprt locus in splenic T cells of B6C3F1 mice exposed to N-ethyl-N-nitrosourea T. R. SKOPEK*tt, V. E. WALKER*, J. E. COCHRANEt, T. R. CRAFTt, AND N. F. CARIELLO* *Department of Pathology and tDepartment of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 Communicated by Kenneth M. Brinkhous, May 26, 1992 ABSTRACT We have determined the mutational spectrum quences for analysis. DGGE is based on the fact that the of N-ethyl-N-nitrosourea (ENU) in exon 3 of the hypoxanthine electrophoretic mobility of a DNA molecule in a polyacryl- guanine) phosphoribosyltransferase gene (Hprt) in splenic T amide gel is considerably reduced as the molecule becomes cells following in vivo exposure ofmale B6C3F1 mice (5-7 weeks partially melted (denatured). Mismatched heteroduplexes old) to ENU. Hpir mutants were isolated by culturing splenic formed by annealing wild-type and mutant DNA sequences T cells in microtiter dishes containing medium supplemented are always less stable than the corresponding perfectly base- with interleukin 2, concanavalin A, and 6-thiouanine. DNA paired homoduplexes and consequently melt at a lower was extracted from 6-thoa ne-sistant colonies and ampli- concentration of denaturant. Therefore, any mutant/wild- fied by the polymerase chain reaction (PCR) using primers type heteroduplex will always travel a shorter distance rel- flanking Hprt exon 3. Identification of mutant sequences and ative to wild-type homoduplexes in a gel containing a dient purification of mutant DNA from contaminating wild-type Hprt ofdenaturant.
    [Show full text]
  • Nitroso and Nitro Compounds 11/22/2014 Part 1
    Hai Dao Baran Group Meeting Nitroso and Nitro Compounds 11/22/2014 Part 1. Introduction Nitro Compounds O D(Kcal/mol) d (Å) NO NO+ Ph NO Ph N cellular signaling 2 N O N O OH CH3−NO 40 1.48 molecule in mammals a nitro compound a nitronic acid nitric oxide b.p = 100 oC (8 mm) o CH3−NO2 57 1.47 nitrosonium m.p = 84 C ion (pKa = 2−6) CH3−NH2 79 1.47 IR: υ(N=O): 1621-1539 cm-1 CH3−I 56 Nitro group is an EWG (both −I and −M) Reaction Modes Nitro group is a "sink" of electron Nitroso vs. olefin: e Diels-Alder reaction: as dienophiles Nu O NO − NO Ene reaction 3 2 2 NO + N R h 2 O e Cope rearrangement υ O O Nu R2 N N N R1 N Nitroso vs. carbonyl R1 O O O O O N O O hυ Nucleophilic addition [O] N R2 R O O R3 Other reaction modes nitrite Radical addition high temp low temp nitrolium EWG [H] ion brown color less ion Redox reaction Photochemical reaction Nitroso Compounds (C-Nitroso Compounds) R2 R1 O R3 R1 Synthesis of C-Nitroso Compounds 2 O R1 R 2 N R3 3 R 3 N R N R N 3 + R2 2 R N O With NO sources: NaNO2/HCl, NOBF4, NOCl, NOSbF6, RONO... 1 R O R R1 O Substitution trans-dimer monomer: blue color cis-dimer colorless colorless R R NOBF OH 4 - R = OH, OMe, Me, NR2, NHR N R2 R3 = H or NaNO /HCl - para-selectivity ΔG = 10 Kcal mol-1 Me 2 Me R1 NO oxime R rate determining step Blue color: n π∗ absorption band 630-790 nm IR: υ(N=O): 1621-1539 cm-1, dimer υ(N−O): 1300 (cis), 1200 (trans) cm-1 + 1 Me H NMR (α-C-H) δ = 4 ppm: nitroso is an EWG ON H 3 Kochi et al.
    [Show full text]
  • Meat Curing and Sodium Nitrite
    MEDIA MYTHCRUSHER Meat Curing and Sodium Nitrite The use of nitrite to produce cured meats like salami, ham, bacon and hot dogs, is a safe, regulated practice that has distinct public health benefits. However, much confusion and even mythology surrounds nitrite. Being mindful of key words and statistics and providing appropriate context can help reporters improve the accuracy of their coverage and the information that is passed on to readers and viewers. We’ve compiled ten tips to improve accuracy when writing about the use of sodium nitrite in cured meats. #1: Nitrite is not ‘unnatural’. Before the terms nitrate and nitrite are often used refrigeration was available, humans salted and interchangeably, meat companies mainly use dried meat to preserve it. It was discovered sodium nitrite to cure meat, not sodium nitrate. that the nitrate in saltpeter was extremely At the turn of the 20th century, German effective in causing a chemical reaction known scientists discovered nitrite (and not nitrate) as “curing.” Not only did this give meat a was the active form of these curing salts. When distinct taste and flavor, it also preserved it and added directly, rather than as nitrate, meat prevented the growth of Clostridium botulinum, processors can have better control of this which causes botulism. important curing ingredient and more closely manage how much they are adding. Later on, scientists came to understand that nitrate naturally found in the environment #3: Cured meats are a miniscule source of converts to nitrite when in the presence of total human nitrite intake. Scientists say that certain bacteria.
    [Show full text]
  • Inhibition of Grb2‑Mediated Activation of MAPK Signal Transduction
    566 ONCOLOGY LETTERS 4: 566-570, 2012 Inhibition of Grb2‑mediated activation of MAPK signal transduction suppresses NOR1/CB1954‑induced cytotoxicity in the HepG2 cell line RONG GUI1, DENGQING LI1, GUANNAN QI1,2, ALI SUHAD2 and XINMIN NIE1 1Clinical Laboratory Centre of the Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China; 2Hormones and Cancer Research Unit, Royal Victoria Hospital, McGill University, Quebec H3A 1A1, Canada Received March 12, 2012; Accepted June 22, 2012 DOI: 10.3892/ol.2012.774 Abstract. The nitroreductase oxidored-nitro domain Introduction containing protein 1 (NOR1) gene may be involved in the chemical carcinogenesis of hepatic cancer and nasopharyn- The oxidored-nitro domain containing protein 1 (NOR1) gene geal carcinoma (NPC). We have previously demonstrated that was previously cloned in our laboratory at the Third Xiangya NOR1 overexpression is capable of converting the monofunc- Hospital (Hunan, China) using suppression subtractive hybrid- tional alkylating agent 5-(aziridin-1-yl)-2,4-dinitrobenzamide ization and cDNA microarrays (1,2). By examining the human (CB1954) into a toxic form by reducing the 4-nitro group of genome working sequence, it has been identified that that the CB1954. Toxic CB1954 is able to enhance cell killing in the NOR1 gene is located on 1p34.3 and contains 10 exons and NPC cell line CNE1; however, the underlying mechanisms 9 introns. Additionally, the PROSITE database identified remain unknown. Using cDNA microarrays and quantitative two possible cAMP and cGMP-dependent protein kinase real-time PCR, we previously discovered that NOR1 increases phosphorylation sites, two tyrosine phosphorylation sites the expression of growth factor receptor-bound protein 2 and four N-myristoylation sites in NOR1.
    [Show full text]
  • Amyl Nitrite Or 'Jungle Juice'
    Young People and Other Drugs Amyl Nitrite or ‘Jungle Juice’ Amyl nitrite is an inhalant that belongs to a class As with any drug, the use of nitrites is not risk-free. of chemicals called alkyl nitrites. This group of Some of the harms associated with its use include: drugs can be called ‘poppers’. They are often injuries related to inhaling the vapour referred to by their brand name, with ‘Jungle (e.g., rashes, burns) Juice’ probably being the most well-known of these. allergic reactions accidents and falls Inhaling amyl nitrite relaxes the body and gives vision problems (isopropyl nitrite) a ‘rush’ that lasts for one to two minutes. It is commonly used to enhance sexual pleasure and in rare cases, blood disorders induce a feeling of euphoria and well-being. MOST IMPORTANTLY, AMYL NITRITE OR JUNGLE JUICE MUST NEVER BE DRUNK. Drinking amyl can result in death due to it interfering with the ability of the blood to transport oxygen. What is amyl nitrite? Over the years, to bypass legal restrictions, nitrites have been sold as such things as liquid incense or Amyl nitrite is an inhalant that belongs to a class of room odoriser. Jungle Juice, which can be sold as chemicals called alkyl nitrites. Amyl nitrite is a highly a leather cleaner, is a common product name of flammable liquid that is clear or yellowish in colour. amyl nitrite. It has a unique smell that is sometimes described as ‘dirty socks’. It is highly volatile and when exposed to the air evaporates almost immediately at How is Jungle Juice used? room temperature.
    [Show full text]
  • ATSDR Case Studies in Environmental Medicine Nitrate/Nitrite Toxicity
    ATSDR Case Studies in Environmental Medicine Nitrate/Nitrite Toxicity Agency for Toxic Substances and Disease Registry Case Studies in Environmental Medicine (CSEM) Nitrate/Nitrite Toxicity Course: WB2342 CE Original Date: December 5, 2013 CE Expiration Date: December 5, 2015 Key • Nitrate toxicity is a preventable cause of Concepts methemoglobinemia. • Infants younger than 4 months of age are at particular risk of nitrate toxicity from contaminated well water. • The widespread use of nitrate fertilizers increases the risk of well-water contamination in rural areas. About This This educational case study document is one in a series of and Other self-instructional modules designed to increase the primary Case Studies care provider’s knowledge of hazardous substances in the in environment and to promote the adoption of medical Environmen- practices that aid in the evaluation and care of potentially tal Medicine exposed patients. The complete series of Case Studies in Environmental Medicine is located on the ATSDR Web site at URL: http://www.atsdr.cdc.gov/csem/csem.html In addition, the downloadable PDF version of this educational series and other environmental medicine materials provides content in an electronic, printable format. Acknowledgements We gratefully acknowledge the work of the medical writers, editors, and reviewers in producing this educational resource. Contributors to this version of the Case Study in Environmental Medicine are listed below. Please Note: Each content expert for this case study has indicated that there is no conflict of interest that would bias the case study content. CDC/ATSDR Author(s): Kim Gehle MD, MPH CDC/ATSDR Planners: Charlton Coles, Ph.D.; Kimberly Gehle, MD; Sharon L.
    [Show full text]
  • Physicochemical Properties of Organic Medicinal Agents
    Principles of Drug Action 1, Spring 2005, Esters ESTERS AND RELATED CARBOXYLIC ACID DERIVATIVES Jack DeRuiter I. Structure and Preparation Esters are derivatives of carboxylic acids that arise via replacement of the hydroxyl (OH) portion of the acid COOH function with an "ether" moiety (-OR): O O H C C O C O Acid Ester Note that replacement of the acid OH group with an "ether" moiety removes the acidic function from the parent structure (acid) resulting in the formation of non-acidic (neutral, but somewhat polar) compounds (esters). Esters can be sub-classified based on their general structure as aliphatic, aromatic or cyclic (called "lactones") as illustrated by the examples below: O O CH2CH3 CH2CH3 O CH3 O O O Aliphatic Ester Aromatic Ester Cyclic Ester (Lactone) A variety of methods have been developed for the preparation of esters. Most of these methods involve reaction of an alcohol with an "activated carboxylic acid" compound (i.e. acid chloride): O O H C C X OC C O X- Ester "Activated" acid (X=Cl) Alcohol (Electrophile) (Nucleophile) The ester functionality does not introduce a center of asymmetry and thus optical and geometric isomerism does not result from the presence of this functional group. The ester functionality (the carbonyl and ether oxygen) is composed of an sp2 hybridized carbon so it cannot be chiral, and since there is free rotation about the ether bond geometric isomerism also is not possible at the sp2 center. 1 Principles of Drug Action 1, Spring 2005, Esters II. Solubility of Esters Esters contain carbonyl (C=O) and ether (O-C) dipoles arising from covalent bonding between electronegative oxygen atoms and electronically neutral carbon atoms.
    [Show full text]
  • Current Advances of Nitric Oxide in Cancer and Anticancer Therapeutics
    Review Current Advances of Nitric Oxide in Cancer and Anticancer Therapeutics Joel Mintz 1,†, Anastasia Vedenko 2,†, Omar Rosete 3 , Khushi Shah 4, Gabriella Goldstein 5 , Joshua M. Hare 2,6,7 , Ranjith Ramasamy 3,6,* and Himanshu Arora 2,3,6,* 1 Dr. Kiran C. Patel College of Allopathic Medicine, Nova Southeastern University, Davie, FL 33328, USA; [email protected] 2 John P Hussman Institute for Human Genomics, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; [email protected] (A.V.); [email protected] (J.M.H.) 3 Department of Urology, Miller School of Medicine, University of Miami, Miami, FL 33136, USA; [email protected] 4 College of Arts and Sciences, University of Miami, Miami, FL 33146, USA; [email protected] 5 College of Health Professions and Sciences, University of Central Florida, Orlando, FL 32816, USA; [email protected] 6 The Interdisciplinary Stem Cell Institute, Miller School of Medicine, University of Miami, Miami, FL 33136, USA 7 Department of Medicine, Cardiology Division, Miller School of Medicine, University of Miami, Miami, FL 33136, USA * Correspondence: [email protected] (R.R.); [email protected] (H.A.) † These authors contributed equally to this work. Abstract: Nitric oxide (NO) is a short-lived, ubiquitous signaling molecule that affects numerous critical functions in the body. There are markedly conflicting findings in the literature regarding the bimodal effects of NO in carcinogenesis and tumor progression, which has important consequences for treatment. Several preclinical and clinical studies have suggested that both pro- and antitumori- Citation: Mintz, J.; Vedenko, A.; genic effects of NO depend on multiple aspects, including, but not limited to, tissue of generation, the Rosete, O.; Shah, K.; Goldstein, G.; level of production, the oxidative/reductive (redox) environment in which this radical is generated, Hare, J.M; Ramasamy, R.; Arora, H.
    [Show full text]
  • Mechanisms of Nitric Oxide Reactions Mediated by Biologically Relevant Metal Centers
    Struct Bond (2014) 154: 99–136 DOI: 10.1007/430_2013_117 # Springer-Verlag Berlin Heidelberg 2013 Published online: 5 October 2013 Mechanisms of Nitric Oxide Reactions Mediated by Biologically Relevant Metal Centers Peter C. Ford, Jose Clayston Melo Pereira, and Katrina M. Miranda Abstract Here, we present an overview of mechanisms relevant to the formation and several key reactions of nitric oxide (nitrogen monoxide) complexes with biologically relevant metal centers. The focus will be largely on iron and copper complexes. We will discuss the applications of both thermal and photochemical methodologies for investigating such reactions quantitatively. Keywords Copper Á Heme models Á Hemes Á Iron Á Metalloproteins Á Nitric oxide Contents 1 Introduction .................................................................................. 101 2 Metal-Nitrosyl Bonding ..................................................................... 101 3 How Does the Coordinated Nitrosyl Affect the Metal Center? .. .. .. .. .. .. .. .. .. .. .. 104 4 The Formation and Decay of Metal Nitrosyls ............................................. 107 4.1 Some General Considerations ........................................................ 107 4.2 Rates of NO Reactions with Hemes and Heme Models ............................. 110 4.3 Mechanistic Studies of NO “On” and “Off” Reactions with Hemes and Heme Models ................................................................................. 115 4.4 Non-Heme Iron Complexes ..........................................................
    [Show full text]
  • Doctor of Philosophy University of London
    ASPECTS OF THIONITRITES AND NITRIC OXIDE IN CHEMISTRY AND BIOLOGY A Thesis Presented by Marta Cavero Tomas In Partial Fulfilment of the Requirements for the Award of the Degree of DOCTOR OF PHILOSOPHY OF THE UNIVERSITY OF LONDON Christopher Ingold Laboratories, Department of Chemistry, University College London, London WC IN OAJ October 1999 ProQuest Number: 10797749 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a com plete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest ProQuest 10797749 Published by ProQuest LLC(2018). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States C ode Microform Edition © ProQuest LLC. ProQuest LLC. 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106- 1346 ABSTRACT This thesis is divided into three parts: Part one is comprised of six chapters and provides a topical review of the main aspects of the chemistry and biology of nitric oxide and of thionitrites. The first chapter is a general introduction to the topic. The second chapter reviews the biology of nitric oxide. The third chapter provides a survey of some of the known chemistry of nitric oxide, with particular emphasis on those aspects which might be relevant in biological systems. The fourth chapter describes the biology of thionitrites in relation to NO.
    [Show full text]