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Nascimento ALA, Guimarães AS, Rocha TDS, Goulart MOF, Xavier JDA, Santos JCC. Structural changes in hemoglobin and glycation. VITAMINS AND HORMONES 2024; 125:183-229. [PMID: 38997164 DOI: 10.1016/bs.vh.2024.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/14/2024]
Abstract
Hemoglobin (Hb) is a hemeprotein found inside erythrocytes and is crucial in transporting oxygen and carbon dioxide in our bodies. In erythrocytes (Ery), the main energy source is glucose metabolized through glycolysis. However, a fraction of Hb can undergo glycation, in which a free amine group from the protein spontaneously binds to the carbonyl of glucose in the bloodstream, resulting in the formation of glycated hemoglobin (HbA1c), widely used as a marker for diabetes. Glycation leads to structural and conformational changes, compromising the function of proteins, and is intensified in the event of hyperglycemia. The main changes in Hb include structural alterations to the heme group, compromising its main function (oxygen transport). In addition, amyloid aggregates can form, which are strongly related to diabetic complications and neurodegenerative diseases. Therefore, this chapter discusses in vitro protocols for producing glycated Hb, as well as the main techniques and biophysical assays used to assess changes in the protein's structure before and after the glycation process. This more complete understanding of the effects of glycation on Hb is fundamental for understanding the complications associated with hyperglycemia and for developing more effective prevention and treatment strategies.
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Affiliation(s)
- Amanda Luise Alves Nascimento
- Federal University of Alagoas, Institute of Chemistry and Biotechnology, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Ari Souza Guimarães
- Federal University of Alagoas, Institute of Chemistry and Biotechnology, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Tauane Dos Santos Rocha
- Federal University of Alagoas, Institute of Chemistry and Biotechnology, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | | | - Jadriane de Almeida Xavier
- Federal University of Alagoas, Institute of Chemistry and Biotechnology, Campus A. C. Simões, Maceió, Alagoas, Brazil.
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2
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Punzalan C, Wang L, Bajrami B, Yao X. Measurement and utilization of the proteomic reactivity by mass spectrometry. MASS SPECTROMETRY REVIEWS 2024; 43:166-192. [PMID: 36924435 DOI: 10.1002/mas.21837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Chemical proteomics, which involves studying the covalent modifications of proteins by small molecules, has significantly contributed to our understanding of protein function and has become an essential tool in drug discovery. Mass spectrometry (MS) is the primary method for identifying and quantifying protein-small molecule adducts. In this review, we discuss various methods for measuring proteomic reactivity using MS and covalent proteomics probes that engage through reactivity-driven and proximity-driven mechanisms. We highlight the applications of these methods and probes in live-cell measurements, drug target identification and validation, and characterizing protein-small molecule interactions. We conclude the review with current developments and future opportunities in the field, providing our perspectives on analytical considerations for MS-based analysis of the proteomic reactivity landscape.
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Affiliation(s)
- Clodette Punzalan
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
| | - Lei Wang
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
- AD Bio US, Takeda, Lexington, Massachusetts, 02421, USA
| | - Bekim Bajrami
- Chemical Biology & Proteomics, Biogen, Cambridge, Massachusetts, USA
| | - Xudong Yao
- Department of Chemistry, University of Connecticut, Storrs, Connecticut, USA
- Institute for Systems Biology, University of Connecticut, Storrs, Connecticut, USA
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3
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Gladchuk AS, Gorbunov AY, Keltsieva OA, Ilyushonok SK, Babakov VN, Shilovskikh VV, Kolonitskii PD, Stepashkin NA, Soboleva A, Muradymov MZ, Krasnov NV, Sukhodolov NG, Selyutin AA, Frolov A, Podolskaya EP. Coating of a MALDI target with metal oxide nanoparticles by droplet-free electrospraying – a versatile tool for in situ enrichment of human globin adducts of halogen-containing drug metabolites. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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4
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Chen HJC. Mass Spectrometry Analysis of DNA and Protein Adducts as Biomarkers in Human Exposure to Cigarette Smoking: Acrolein as an Example. Chem Res Toxicol 2023; 36:132-140. [PMID: 36626705 DOI: 10.1021/acs.chemrestox.2c00354] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Acrolein is a major component in cigarette smoke and a product of endogenous lipid peroxidation. It is difficult to distinguish human exposure to acrolein from exogenous sources versus endogenous causes, as components in cigarette smoke can stimulate lipid peroxidation in vivo. Therefore, analysis of acrolein-induced DNA and protein adducts by the highly accurate, sensitive, and specific mass spectrometry-based methods is vital to estimate the degree of damage by this IARC Group 2A carcinogen. This Perspective reviews the analyses of acrolein-induced DNA and protein adducts in humans by mass spectrometry focusing on samples accessible for biomonitoring, including DNA from leukocytes and oral cells and abundant proteins from blood, i.e., hemoglobin and serum albumin.
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Affiliation(s)
- Hauh-Jyun Candy Chen
- Department of Chemistry and Biochemistry and Center for Nano Bio-Detection (AIM-HI), National Chung Cheng University, 168 University Road, Ming-Hsiung, Chia-Yi 62142, Taiwan
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5
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Vryonidis E, Karlsson I, Aasa J, Carlsson H, Motwani HV, Pedersen M, Eriksson J, Törnqvist MÅ. Pathways to Identify Electrophiles In Vivo Using Hemoglobin Adducts: Hydroxypropanoic Acid Valine Adduct and Its Possible Precursors. Chem Res Toxicol 2022; 35:2227-2240. [PMID: 36395356 PMCID: PMC9768813 DOI: 10.1021/acs.chemrestox.2c00208] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Analytical methods and tools for the characterization of the human exposome by untargeted mass spectrometry approaches are advancing rapidly. Adductomics methods have been developed for untargeted screening of short-lived electrophiles, in the form of adducts to proteins or DNA, in vivo. The identification of an adduct and its precursor electrophile in the blood is more complex than that of stable chemicals. The present work aims to illustrate procedures for the identification of an adduct to N-terminal valine in hemoglobin detected with adductomics, and pathways for the tracing of its precursor and possible exposure sources. Identification of the adduct proceeded via preparation and characterization of standards of adduct analytes. Possible precursor(s) and exposure sources were investigated by measurements in blood of adduct formation by precursors in vitro and adduct levels in vivo. The adduct was identified as hydroxypropanoic acid valine (HPA-Val) by verification with a synthesized reference. The HPA-Val was measured together with other adducts (from acrylamide, glycidamide, glycidol, and acrylic acid) in human blood (n = 51, schoolchildren). The HPA-Val levels ranged between 6 and 76 pmol/g hemoglobin. The analysis of reference samples from humans and rodents showed that the HPA-Val adduct was observed in all studied samples. No correlation of the HPA-Val level with the other studied adducts was observed in humans, nor was an increase in tobacco smokers observed. A small increase was observed in rodents exposed to glycidol. The formation of the HPA-Val adduct upon incubation of blood with glycidic acid (an epoxide) was shown. The relatively high adduct levels observed in vivo in relation to the measured reactivity of the epoxide, and the fact that the epoxide is not described as naturally occurring, suggest that glycidic acid is not the only precursor of the HPA-Val adduct identified in vivo. Another endogenous electrophile is suspected to contribute to the in vivo HPA-Val adduct level.
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Affiliation(s)
- Efstathios Vryonidis
- Department
of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Isabella Karlsson
- Department
of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jenny Aasa
- Department
of Risk and Benefit Assessment, Swedish
Food Agency, SE-751 26 Uppsala, Sweden
| | - Henrik Carlsson
- Department
of Medical Sciences, Clinical Chemistry, Uppsala University, SE-751
85 Uppsala, Sweden
| | - Hitesh V. Motwani
- Department
of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Marie Pedersen
- Department
of Public Health, University of Copenhagen, DK-1353 Copenhagen, Denmark
| | - Johan Eriksson
- Department
of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Margareta Å. Törnqvist
- Department
of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden,
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6
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Yamagishi Y, Nagasawa S, Iwase H, Ogra Y. Evaluation of Post-Mortem Interaction between Hemoglobin and Oxime-Type Carbamate Pesticides. Chem Res Toxicol 2022; 35:1110-1116. [PMID: 35559618 DOI: 10.1021/acs.chemrestox.2c00092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxime-type carbamate pesticides having an oxime moiety such as aldicarb, butocarboxim, methomyl, oxamyl, and thiofanox are widely used and have been detected in many fatal cases of accidental exposure or suicide. In forensic toxicology, the accurate determination of blood pesticide concentration is obligatory to prove death by oxime-type carbamate pesticide poisoning. However, the fatal pesticide concentration in blood at autopsy differs from that at the time of death. In this study, we found that oxime-type carbamate pesticides were decomposed by Hb in a temperature-dependent fashion. The mechanism underlying methomyl, aldicarb, oxamyl, and thiofanox decomposition involves the formation of adducts with the amino acids in Hb. With regard to butocarboxim, its decomposition involves the oxidation of the free form and the formation of adducts with the amino acids in Hb. The mass spectra obtained by liquid chromatography quadrupole time-of-flight mass spectrometry revealed that carbamylated amino acid adducts such as Wcar-adduct and Vcar-adduct were formed in Hb solution incubated with methomyl, aldicarb, oxamyl, and thiofanox, whereas alkylated amino acid adducts such as Walkyl-adduct were formed in Hb solution incubated with butocarboxim. These results indicate that aldicarb, butocarboxim, methomyl, oxamyl, and thiofanox are post-mortem changed by Hb.
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Affiliation(s)
- Yoshikazu Yamagishi
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan
| | - Sayaka Nagasawa
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan
| | - Hirotaro Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Department of Forensic Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
| | - Yasumitsu Ogra
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan.,Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan
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7
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Funk WE, Montgomery N, Bae Y, Chen J, Chow T, Martinez MP, Lurmann F, Eckel SP, McConnell R, Xiang AH. Human Serum Albumin Cys34 Adducts in Newborn Dried Blood Spots: Associations With Air Pollution Exposure During Pregnancy. Front Public Health 2022; 9:730369. [PMID: 35004563 PMCID: PMC8733257 DOI: 10.3389/fpubh.2021.730369] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 11/22/2021] [Indexed: 12/30/2022] Open
Abstract
Background: Increasing evidence suggests that exposure to air pollution during pregnancy is associated with adverse pregnancy outcomes. However, biomarkers associated with air pollution exposure are widely lacking and often transient. In addition, ascertaining biospecimens during pregnacy to assess the prenatal environment remains largely infeasible. Objectives: To address these challenges, we investigated relationships between air pollution exposure during pregnancy and human serum albumin Cys34 (HSA-Cys34) adducts in newborn dried blood spots (DBS) samples, which captures an integration of perinatal exposures to small reactive molecules in circulating blood. Methods: Newborn DBS were obtained from a state archive for a cohort of 120 children born at one Kaiser Permanente Southern California (KPSC) hospitals in 2007. These children were selected to maximize the range of residential air pollution exposure during the entire pregnancy to PM2.5, PM10, NO2, O3, based on monthly estimates interpolated from regulatory monitoring sites. HSA-Cys34 adducts were selected based on previously reported relationships with air pollution exposure and oxidative stress. Results: Six adducts measured in newborn DBS samples were associated with air pollution exposures during pregnancy; these included direct oxidation products, adducts formed with small thiol compounds, and adducts formed with reactive aldehydes. Two general trends were identified: Exposure to air pollution late in pregnancy (i.e., in the last 30 days) was associated with increased oxidative stress, and exposure to air pollution earlier in pregnancy (i.e., not in the last 30 days) was associated with decreased oxidative stress around the time of birth. Discussion: Air pollution exposure occurring during pregnancy can alter biology and leave measurable impacts on the developing infant captured in the newborn DBS adductome, which represents a promising tool for investigating adverse birth outcomes in population-based studies.
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Affiliation(s)
- William E Funk
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Evanston, IL, United States
| | - Nathan Montgomery
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Evanston, IL, United States
| | - Yeunook Bae
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Evanston, IL, United States
| | - Jiexi Chen
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Evanston, IL, United States
| | - Ting Chow
- Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, United States
| | - Mayra P Martinez
- Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, United States
| | - Fred Lurmann
- Sonoma Technology, Inc., Petaluma, CA, United States
| | - Sandrah P Eckel
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Rob McConnell
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Anny H Xiang
- Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, United States
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8
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Detection of Benzo[ a]pyrene Diol Epoxide Adducts to Histidine and Lysine in Serum Albumin In Vivo by High-Resolution-Tandem Mass Spectrometry. TOXICS 2022; 10:toxics10010027. [PMID: 35051069 PMCID: PMC8778559 DOI: 10.3390/toxics10010027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/23/2021] [Accepted: 12/30/2021] [Indexed: 02/01/2023]
Abstract
Electrophilic diol epoxide metabolites are involved in the carcinogenicity of benzo[a]pyrene, one of the widely studied polycyclic aromatic hydrocarbons (PAHs). The exposure of humans to this PAH can be assessed by measuring stable blood protein adducts, such as to histidine and lysine in serum albumin, from their reactive metabolites. In this respect, measurement of the adducts originating from the genotoxic (+)-anti-benzo[a]pyrene diol epoxide is of interest. However, these are difficult to measure at such low levels as are expected in humans generally exposed to benzo[a]pyrene from air pollution and the diet. The analytical methods detecting PAH-biomarkers still suffer from low selectivity and/or detectability to enable generation of data for calculation of in vivo doses of specific stereoisomers, for evaluation of risk factors and assessing risk from exposures to PAH. Here, we suggest an analytical methodology based on high-pressure liquid chromatography (HPLC) coupled to high-resolution tandem mass spectrometry (MS) to lower the detection limits as well as to increase the selectivity with improvements in both chromatographic separation and mass determination. Method development was performed using serum albumin alkylated in vitro by benzo[a]pyrene diol epoxide isomers. The (+)-anti-benzo[a]pyrene diol epoxide adducts could be chromatographically resolved by using an HPLC column with a pentafluorophenyl stationary phase. Interferences were further diminished by the high mass accuracy and resolving power of Orbitrap MS. The achieved method detection limit for the (+)-anti-benzo[a]pyrene diol epoxide adduct to histidine was approximately 4 amol/mg serum albumin. This adduct as well as the adducts to histidine from (−)-anti- and (+/−)-syn-benzo[a]pyrene diol epoxide were quantified in the samples from benzo[a]pyrene-exposed mice. Corresponding adducts to lysine were also quantified. In human serum albumin, the anti-benzo[a]pyrene diol epoxide adducts to histidine were detected in only two out of twelve samples and at a level of approximately 0.1 fmol/mg.
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9
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Pedersen M, Vryonidis E, Joensen A, Törnqvist M. Hemoglobin adducts of acrylamide in human blood - What has been done and what is next? Food Chem Toxicol 2022; 161:112799. [PMID: 34995709 DOI: 10.1016/j.fct.2021.112799] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 12/21/2021] [Accepted: 12/24/2021] [Indexed: 12/12/2022]
Abstract
Acrylamide forms in many commonly consumed foods. In animals, acrylamide causes tumors, neurotoxicity, developmental and reproductive effects. Acrylamide crosses the placenta and has been associated with restriction of intrauterine growth and certain cancers. The impact on human health is poorly understood and it is impossible to say what level of dietary exposure to acrylamide can be deemed safe as the assessment of exposure is uncertain. The determination of hemoglobin (Hb) adducts from acrylamide is increasingly being used to improve the exposure assessment of acrylamide. We aim to outline the literature on Hb adduct levels from acrylamide in humans and discuss methodological issues and research gaps. A total of 86 studies of 27,966 individuals from 19 countries were reviewed. Adduct levels were highest in occupationally exposed individuals and smokers. Levels ranged widely from 3 to 210 pmol/g Hb in non-smokers and this wide range suggests that dietary exposure to acrylamide varies largely. Non-smokers from the US and Canada had slightly higher levels as compared with non-smokers from elsewhere, but differences within studies were larger than between studies. Large studies with exposure assessment of acrylamide and related adduct forming compounds from diet during early-life are encouraged for the evaluation of health effects.
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Affiliation(s)
- Marie Pedersen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.
| | | | - Andrea Joensen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Margareta Törnqvist
- Department of Environmental Science, Stockholm University, Stockholm, Sweden
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10
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Yamagishi Y, Nagasawa S, Iwase H, Ogra Y. Post-mortem interaction between methidathion and human serum albumin in blood. J Toxicol Sci 2022; 47:139-146. [DOI: 10.2131/jts.47.139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
| | - Sayaka Nagasawa
- Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University
| | - Hirotaro Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University
| | - Yasumitsu Ogra
- Department of Legal Medicine, Graduate School of Medicine, Chiba University
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11
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Grigoryan H, Imani P, Dudoit S, Rappaport SM. Extending the HSA-Cys34-Adductomics Pipeline to Modifications at Lys525. Chem Res Toxicol 2021; 34:2549-2557. [PMID: 34788011 DOI: 10.1021/acs.chemrestox.1c00311] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We previously developed an adductomics pipeline that employed nanoflow liquid chromatography and high-resolution tandem mass spectrometry (nLC-HR-MS/MS) plus informatics to perform an untargeted detection of modifications to Cys34 in the tryptic T3 peptide of human serum albumin (HSA) (21ALVLIAFAQYLQQC34PFEDHVK41). In order to detect these peptide modifications without targeting specific masses, the pipeline interrogates MS2 ions that are signatures of the T3 peptide. The pipeline had been pilot-tested with archived plasma from healthy human subjects, and several of the 43 Cys34 adducts were highly associated with the smoking status. In the current investigation, we adapted the pipeline to include modifications to the ε-amino group of Lys525─a major glycation site in HSA─and thereby extend the coverage to products of Schiff bases that cannot be produced at Cys34. Because trypsin is generally unable to digest proteins at modified lysines, our pipeline detects miscleaved tryptic peptides with the sequence 525KQTALVELVK534. Adducts of both Lys525 and Cys34 are measured in a single nLC-HR-MS/MS run by increasing the mass range of precursor ions in MS1 scans and including both triply and doubly charged precursor ions for collision-induced dissociation fragmentation. For proof of principle, we applied the Cys34/Lys525 pipeline to archived plasma specimens from a subset of the same volunteer subjects used in the original investigation. Twelve modified Lys525 peptides were detected, including products of glycation (fructosyl-lysine plus advanced-glycated-end products), acetylation, and elimination of ammonia and water. Surprisingly, the carbamylated and glycated adducts were present at significantly lower levels in smoking subjects. By including a larger class of in vivo nucleophilic substitution reactions, the Cys34/Lys525 adductomics pipeline expands exposomic investigations of unknown human exposure to reactive electrophiles derived from both exogenous and endogenous sources.
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Affiliation(s)
- Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720, United States
| | - Partow Imani
- Division of Biostatistics, School of Public Health, University of California, Berkeley, California 94720, United States
| | - Sandrine Dudoit
- Division of Biostatistics, School of Public Health, University of California, Berkeley, California 94720, United States.,Department of Statistics, University of California, Berkeley, California 94720, United States
| | - Stephen M Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, California 94720, United States
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12
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Abstract
Chemicals are measured regularly in air, food, the environment, and the workplace. Biomonitoring of chemicals in biological fluids is a tool to determine the individual exposure. Blood protein adducts of xenobiotics are a marker of both exposure and the biologically effective dose. Urinary metabolites and blood metabolites are short term exposure markers. Stable hemoglobin adducts are exposure markers of up to 120 days. Blood protein adducts are formed with many xenobiotics at different sites of the blood proteins. Newer methods apply the techniques developed in the field of proteomics. Larger adducted peptides with 20 amino acids are used for quantitation. Unfortunately, at present the methods do not reach the limits of detection obtained with the methods looking at single amino acid adducts or at chemically cleaved adducts. Therefore, to progress in the field new approaches are needed.
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13
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Yamagishi Y, Iwase H, Ogra Y. Effects of human serum albumin on post-mortem changes of malathion. Sci Rep 2021; 11:11573. [PMID: 34079008 PMCID: PMC8172840 DOI: 10.1038/s41598-021-91145-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 05/21/2021] [Indexed: 12/14/2022] Open
Abstract
Malathion, diethyl 2-[(dimethoxyphosphinothioyl)thio]butanedioate, is one of most widely used organophosphoryl pesticide, and it has been detected in several clinical cases of accidental exposure and suicide. It is reported that the observed malathion concentration in blood of persons who suffer from malathion poisoning is smaller than the expected concentration. Because malathion is bound to human serum albumin (HSA), recovery of malathion in the free form is insufficient. We detected malathion adducts in HSA by liquid chromatography quadrupole time-of-flight mass spectrometry (LC-Q/TOF–MS). The mass spectra showed that malathion was preferably bound to the lysine (K) and cysteinylproline (CP) residues of HSA. The K- and CP-adducts of malathion were increased in vitro with a dose-dependent fashion when its concentration was smaller than the lethal dose. Further, the K-adduct was also detected in post-mortem blood of an autopsied subject suffering from intentional malathion ingestion. These results suggest that the K-adduct seems to be available to use a biomarker of malathion poisoning, and the determination of the K-adduct could make possible to estimate the amount of malathion ingestion.
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Affiliation(s)
- Yoshikazu Yamagishi
- Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba, 260-8675, Japan.,Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba, 260-8670, Japan
| | - Hirotaro Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba, 260-8670, Japan
| | - Yasumitsu Ogra
- Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba, 260-8675, Japan. .,Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba, 260-8670, Japan.
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14
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Chu S, Letcher RJ. Identification and characterization of serum albumin covalent adduct formed with atrazine by liquid chromatography mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1163:122503. [PMID: 33388526 DOI: 10.1016/j.jchromb.2020.122503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 12/13/2020] [Indexed: 11/16/2022]
Abstract
The present study developed an analytical technique to investigate the possible covalent adduct formation of albumin with the herbicide atrazine, and to characterize the protein modifications in vitro using liquid chromatography separation coupled with high resolution time-of-flight mass spectrometry (LC-TOF-MS). Tandem mass spectrum analysis (MS/MS) with collision induced dissociation (CID) revealed the specific sites of rat, human and bovine serum albumin adduct with atrazine. The formation of b-ion, y-ion series in MS/MS showed a covalent adduct with an addition mass of 179.1 Da located on Cys-34 of serum albumin from rats, human and bovine. This clearly indicated that the chemical group C8H13N5 forms an adduct with Cys-34 despite the sequences differences between of rat, human and bovine serum albumin. To confirm the method reliability, concentration-dependent and time-dependent formation of adducts between serum albumins and atrazine were also investigated. Our results confirmed that atrazine can directly react with Cys-34 of serum albumin and form covalent adducts without prior metabolism.
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Affiliation(s)
- Shaogang Chu
- Ecotoxicology and Wildlife Health Division, Wildlife and Landscape Science Directorate, Environment and Climate Change Canada, National Wildlife Research Centre, 1125 Colonel By Drive, Carleton University, Ottawa, ON, K1A 0H3 Canada
| | - Robert J Letcher
- Ecotoxicology and Wildlife Health Division, Wildlife and Landscape Science Directorate, Environment and Climate Change Canada, National Wildlife Research Centre, 1125 Colonel By Drive, Carleton University, Ottawa, ON, K1A 0H3 Canada.
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15
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Yamagishi Y, Iwase H, Ogra Y. Post-Mortem Changes of Methomyl in Blood with Hemoglobin. Chem Res Toxicol 2021; 34:161-168. [PMID: 33405899 DOI: 10.1021/acs.chemrestox.0c00472] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Methomyl, (E,Z)-methyl N-{[(methylamino)carbonyl]oxy}ethanimidothioate, is a widely used pesticide that has been detected in many fatal cases of accidental exposure or suicide. Forensic toxicologists have been baffled that the blood methomyl concentration in persons who have died of methomyl poisoning is much lower than the expected concentration in blood. In this study, we speculated two mechanisms underlying the insufficient recovery of methomyl in blood. First, methomyl is decomposed by serum albumin as esterase. Second, methomyl is bound to a specific blood protein, resulting in insufficient recovery in the free form. However, human serum albumin does not show esterase activity for the decomposition of methomyl. On the contrary, specific methomyl hemoglobin adducts have been detected by liquid chromatography quadrupole time-of-flight mass spectrometry (LC-Q/TOF-MS). The mass spectra indicated that methomyl was specifically bound to tryptophan (W), tyrosine (Y), and valine (V) residues in hemoglobin. The amounts of W- and V-adducts dose-dependently increased in vitro when the methomyl concentration was lower than the lethal concentration. In addition, the W-adduct was detected in blood sampled from an autopsied subject who died of intentional methomyl ingestion, suggesting that the W-adduct could be used as a biomarker of methomyl poisoning. We were able to estimate the amount of methomyl ingested on the basis of the amount of the W-adduct.
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Affiliation(s)
- Yoshikazu Yamagishi
- Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan.,Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8675, Japan
| | - Hirotaro Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8675, Japan
| | - Yasumitsu Ogra
- Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan.,Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8675, Japan
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16
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Ndreu L, Erber LN, Törnqvist M, Tretyakova NY, Karlsson I. Characterizing Adduct Formation of Electrophilic Skin Allergens with Human Serum Albumin and Hemoglobin. Chem Res Toxicol 2020; 33:2623-2636. [PMID: 32875789 PMCID: PMC7582624 DOI: 10.1021/acs.chemrestox.0c00271] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
![]()
Skin
(contact) allergy, the most predominant form of immunotoxicity
in humans, is caused by small electrophilic compounds (haptens) that
modify endogenous proteins. Approximately 20% of the general population
in the Western world is affected by contact allergy. Although the
importance of the hapten–protein conjugates is well established
in the initiation of the immunological reaction, not much progress
has been made regarding identification of these conjugates in vivo or exploration of their potential as diagnostic
tools. In this study, the human serum albumin (HSA) and human hemoglobin
(Hb) adductome for three representative contact allergens with different
chemical properties, 1-chloro-2,4-dinitrobenzene (DNCB), 1,2-epoxy-3-phenoxypropane
(PGE), and 2-bromo-2-(bromomethyl)glutaronitrile (MDBGN), were studied.
Plasma and red blood cell lysate were used as a source for HSA and
Hb, respectively. The Direct Peptide Reactivity Assay was used to
investigate adduct formation of MDBGN with nucleophilic moieties and
revealed that MDGBN is converted to 2-methylenepentanedinitrile in
the presence of sulfhydryl groups prior to adduct formation. Following
incubation of HSA and Hb with haptens, an Orbitrap Q Exactive high-resolution
mass spectrometer was used to perform an initial untargeted analysis
to screen for adduct formation, followed by confirmation by targeted
Parallel Reaction Monitoring analysis. Although a subset of adducted
sites was confirmed by targeted analysis, only some of the adducted
peptides showed an increase in the relative amount of the adducted
peptide with an increased concentration of hapten. In total, seven
adduct sites for HSA and eight for Hb were confirmed for DNCB and
PGE. These sites are believed to be the most reactive. Further, three
of the HSA sites (Cys34, Cys62, and Lys190) and six of the Hb sites (subunit α: Val1, His45, His72; subunit β: Cys93, His97, and Cys112) were haptenated already
at the lowest level of hapten to protein molar ratio (0.1:1), indicating
that these sites are the most likely to be modified in vivo. To the best of our knowledge, this is the first time that the adductome
of Hb has been studied in the context of contact allergens. Identification
of the most reactive sites of abundant proteins, such as HSA and Hb,
is the first step toward identification of contact allergy biomarkers
that can be used for biomonitoring and to develop better diagnostic
tools based on a blood sample.
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Affiliation(s)
- Lorena Ndreu
- Department of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Luke N Erber
- Department of Medicinal Chemistry and the College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States.,Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Margareta Törnqvist
- Department of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Natalia Y Tretyakova
- Department of Medicinal Chemistry and the College of Pharmacy, University of Minnesota, Minneapolis, Minnesota 55455, United States.,Masonic Cancer Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Isabella Karlsson
- Department of Environmental Science, Stockholm University, SE-106 91 Stockholm, Sweden
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17
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Sabbioni G, Berset JD, Day BW. Is It Realistic to Propose Determination of a Lifetime Internal Exposome? Chem Res Toxicol 2020; 33:2010-2021. [PMID: 32672951 DOI: 10.1021/acs.chemrestox.0c00092] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Biomonitoring of xenobiotics has been performed for many years in occupational and environmental medicine. It has revealed hidden exposures and the exposure of workers could be reduced. Although most of the toxic effects of chemicals on humans were discovered in workers, the scientific community has more recently focused on environmental samples. In several countries, urinary and blood samples have been collected and analyzed for xenobiotics. Health, biochemical, and clinical parameters were measured in the biomonitoring program of the Unites States. The data were collected and evaluated as group values, comparing races, ages, and gender. The term exposome was created in order to relate chemical exposure to health effects together with the terms genome, proteome, and transcriptome. Internal exposures were mostly established with snapshot measurements, which can lead to an obvious misclassification of the individual exposures. Albumin and hemoglobin adducts of xenobiotics reflect the exposure of a larger time frame, up to 120 days. It is likely that only a small fraction of xenobiotics form such adducts. In addition, adduct analyses are more work intensive than the measurement of xenobiotics and metabolites in urine and/or blood. New technology, such as high-resolution mass spectrometry, will enable the discovery of new compounds that have been overlooked in the past, since over 300,000 chemicals are commercially available and most likely also present in the environment. Yet, quantification will be challenging, as it was for the older methods. At this stage, determination of a lifetime internal exposome is very unrealistic. Instead of an experimental approach with a large number of people, which is economically and scientifically not feasible, in silico methods should be developed further to predict exposure, toxicity, and potential health effects of mixtures. The computer models will help to focus internal exposure investigations on smaller groups of people and smaller number of chemicals.
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Affiliation(s)
- Gabriele Sabbioni
- Institute of Environmental and Occupational Toxicology, CH-6780 Airolo, Switzerland.,Walther-Straub-Institute of Pharmacology and Toxicology, Ludwig-Maximilians-Universität München, D-80336 München, Germany
| | - Jean-Daniel Berset
- Institute of Environmental and Occupational Toxicology, CH-6780 Airolo, Switzerland
| | - Billy W Day
- Medantox LLC, Pittsburgh, Pennsylvania 15241, United States.,ReNeuroGen LLC, Elm Grove, Wisconsin 53122, United States
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18
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Rubino FM. Center-of-Mass iso-Energetic Collision-Induced Decomposition in Tandem Triple Quadrupole Mass Spectrometry. Molecules 2020; 25:molecules25092250. [PMID: 32397650 PMCID: PMC7249026 DOI: 10.3390/molecules25092250] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 11/16/2022] Open
Abstract
Two scan modes of the triple quadrupole tandem mass spectrometer, namely Collision Induced Dissociation Precursor Ion scan and Neutral Loss scan, allow selectively pinpointing, in a complex mixture, compounds that feature specific chemical groups, which yield characteristic fragment ions or are lost as distinctive neutral fragments. This feature of the triple quadrupole tandem mass spectrometer allows the non-target screening of mixtures for classes of components. The effective (center-of-mass) energy to achieve specific fragmentation depends on the inter-quadrupole voltage (laboratory-frame collision energy) and on the masses of the precursor molecular ion and of the collision gas, through a non-linear relationship. Thus, in a class of homologous compounds, precursor ions activated at the same laboratory-frame collision energy face different center-of-mass collision energy, and therefore the same fragmentation channel operates with different degrees of efficiency. This article reports a linear equation to calculate the laboratory-frame collision energy necessary to operate Collision-Induced Dissociation at the same center-of-mass energy on closely related compounds with different molecular mass. A routine triple quadrupole tandem mass spectrometer can operate this novel feature (iso-energetic collision-induced dissociation scan; i-CID) to analyze mixtures of endogenous metabolites by Precursor Ion and Neutral Loss scans. The latter experiment also entails the hitherto unprecedented synchronized scanning of all three quadrupoles of the triple quadrupole tandem mass spectrometer. To exemplify the application of this technique, this article shows two proof-of-principle approaches to the determination of biological mixtures, one by Precursor Ion analysis on alpha amino acid derivatized with a popular chromophore, and the other on modified nucleosides with a Neutral Fragment Loss scan.
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Affiliation(s)
- Federico Maria Rubino
- LaTMA Laboratory for Analytical Toxicology and Metabonomics, Department of Health Sciences, Università degli Studi di Milano at "Ospedale San Paolo" v. A. di Rudinì 8, I-20142 Milano, Italy
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19
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Nakashima F, Shibata T, Uchida K. A unique mechanism for thiolation of serum albumins by disulphide molecules. J Biochem 2020; 167:165-171. [PMID: 31598674 DOI: 10.1093/jb/mvz084] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 09/30/2019] [Indexed: 12/15/2022] Open
Abstract
Protein S-thiolation is a reversible oxidative modification that serves as an oxidative regulatory mechanism for certain enzymes and binding proteins with reactive cysteine residues. It is generally believed that the thiolation occurs at free sulphydryl group of cysteine residues. Meanwhile, despite the fact that disulphide linkages, serving structural and energetic roles in proteins, are stable and inert to oxidative modification, a recent study shows that the thiolation could also occur at protein disulphide linkages when human serum albumin (HSA) was treated with disulphide molecules, such as cystine and homocystine. A chain reaction mechanism has been proposed for the thiolation at disulphide linkages, in which free cysteine (Cys34) is involved in the reaction with disulphide molecules to form free thiols (cysteine or homocysteine) that further react with protein disulphide linkages to form the thiolated cysteine residues in the protein. This review focuses on the recent finding of this unique chain reaction mechanism of protein thiolation.
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Affiliation(s)
- Fumie Nakashima
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Takahiro Shibata
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Koji Uchida
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
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20
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Preston GW, Dagnino S, Ponzi E, Sozeri O, van Veldhoven K, Barratt B, Liu S, Grigoryan H, Lu SS, Rappaport SM, Chung KF, Cullinan P, Sinharay R, Kelly FJ, Chadeau-Hyam M, Vineis P, Phillips DH. Relationships between airborne pollutants, serum albumin adducts and short-term health outcomes in an experimental crossover study. CHEMOSPHERE 2020; 239:124667. [PMID: 31499299 DOI: 10.1016/j.chemosphere.2019.124667] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/21/2019] [Accepted: 08/24/2019] [Indexed: 06/10/2023]
Abstract
Exposure to air pollution can have both short-term and long-term effects on health. However, the relationships between specific pollutants and their effects can be obscured by characteristics of both the pollution and the exposed population. One way of elucidating the relationships is to link exposures and internal changes at the level of the individual. To this end, we combined personal exposure monitoring (59 individuals, Oxford Street II crossover study) with mass-spectrometry-based analyses of putative serum albumin adducts (fixed-step selected reaction monitoring). We attempted to infer adducts' identities using data from another, higher-resolution mass spectrometry method, and were able to detect a semi-synthetic standard with both methods. A generalised least squares regression method was used to test for associations between amounts of adducts and pollution measures (ambient concentrations of nitrogen dioxide and particulate matter), and between amounts of adducts and short-term health outcomes (measures of lung health and arterial stiffness). Amounts of some putative adducts (e.g., one with a positive mass shift of ∼143 Da) were associated with exposure to pollution (11 associations), and amounts of other adducts were associated with health outcomes (eight associations). Adducts did not appear to provide a link between exposures and short-term health outcomes.
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Affiliation(s)
- George W Preston
- MRC-PHE Centre for Environment & Health, Department of Analytical, Environmental & Forensic Sciences, School of Population Health & Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Sonia Dagnino
- MRC-PHE Centre for Environment & Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, Norfolk Place, London, W2 1PG, UK
| | - Erica Ponzi
- MRC-PHE Centre for Environment & Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, Norfolk Place, London, W2 1PG, UK; Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Hirschengraben 84, 8001, Zurich, Switzerland
| | - Osman Sozeri
- MRC-PHE Centre for Environment & Health, Department of Analytical, Environmental & Forensic Sciences, School of Population Health & Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Karin van Veldhoven
- MRC-PHE Centre for Environment & Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, Norfolk Place, London, W2 1PG, UK
| | - Benjamin Barratt
- MRC-PHE Centre for Environment & Health, Department of Analytical, Environmental & Forensic Sciences, School of Population Health & Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Sa Liu
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Sixin S Lu
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Stephen M Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Kian Fan Chung
- National Heart & Lung Institute, Faculty of Medicine, Imperial College London, Royal Brompton Campus, London, SW3 6LY, UK; NIHR Biomedical Research Unit, Royal Brompton & Harefield NHS Trust, London, SW3 6NP, UK
| | - Paul Cullinan
- National Heart & Lung Institute, Faculty of Medicine, Imperial College London, Royal Brompton Campus, London, SW3 6LY, UK; NIHR Biomedical Research Unit, Royal Brompton & Harefield NHS Trust, London, SW3 6NP, UK
| | - Rudy Sinharay
- Pulmonary, Adult Critical Care and Sleep Directorate, Guy's and St Thomas' NHS Foundation Trust, London, SE1 7EH, UK
| | - Frank J Kelly
- MRC-PHE Centre for Environment & Health, Department of Analytical, Environmental & Forensic Sciences, School of Population Health & Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Marc Chadeau-Hyam
- MRC-PHE Centre for Environment & Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, Norfolk Place, London, W2 1PG, UK
| | - Paolo Vineis
- MRC-PHE Centre for Environment & Health, Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, Norfolk Place, London, W2 1PG, UK
| | - David H Phillips
- MRC-PHE Centre for Environment & Health, Department of Analytical, Environmental & Forensic Sciences, School of Population Health & Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK.
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21
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Grigoryan H, Schiffman C, Gunter MJ, Naccarati A, Polidoro S, Dagnino S, Dudoit S, Vineis P, Rappaport SM. Cys34 Adductomics Links Colorectal Cancer with the Gut Microbiota and Redox Biology. Cancer Res 2019; 79:6024-6031. [PMID: 31641032 PMCID: PMC6891211 DOI: 10.1158/0008-5472.can-19-1529] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 08/21/2019] [Accepted: 10/11/2019] [Indexed: 12/12/2022]
Abstract
Chronic inflammation is an established risk factor for colorectal cancer. To study reactive products of gut inflammation and redox signaling on colorectal cancer development, we used untargeted adductomics to detect adduct features in prediagnostic serum from the EPIC Italy cohort. We focused on modifications to Cys34 in human serum albumin, which is responsible for scavenging small reactive electrophiles that might initiate cancers. Employing a combination of statistical methods, we selected seven Cys34 adducts associated with colorectal cancer, as well as body mass index (BMI; a well-known risk factor). Five adducts were more abundant in colorectal cancer cases than controls and clustered with each other, suggesting a common pathway. Because two of these adducts were Cys34 modifications by methanethiol, a microbial-human cometabolite, and crotonaldehyde, a product of lipid peroxidation, these findings further implicate infiltration of gut microbes into the intestinal mucosa and the corresponding inflammatory response as causes of colorectal cancer. The other two associated adducts were Cys34 disulfides of homocysteine that were less abundant in colorectal cancer cases than controls and may implicate homocysteine metabolism as another causal pathway. The selected adducts and BMI ranked higher as potentially causal factors than variables previously associated with colorectal cancer (smoking, alcohol consumption, physical activity, and total meat consumption). Regressions of case-control differences in adduct levels on days to diagnosis showed no statistical evidence that disease progression, rather than causal factors at recruitment, contributed to the observed differences. These findings support the hypothesis that infiltration of gut microbes into the intestinal mucosa and the resulting inflammation are causal factors for colorectal cancer. SIGNIFICANCE: Infiltration of gut microbes into the intestinal mucosa and the resulting inflammation are causal factors for colorectal cancer.
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Affiliation(s)
- Hasmik Grigoryan
- School of Public Health, University of California, Berkeley, California
| | | | - Marc J Gunter
- Section of Nutrition and Metabolism, International Agency for Research on Cancer, Lyon, France
| | | | - Silvia Polidoro
- Italian Institute for Genomic Medicine (IIGM), Torino, Italy
| | - Sonia Dagnino
- MRC-PHE Centre for Environment & Health, Imperial College, London, United Kingdom
| | - Sandrine Dudoit
- School of Public Health, University of California, Berkeley, California
- Department of Statistics, University of California, Berkeley, California
| | - Paolo Vineis
- Italian Institute for Genomic Medicine (IIGM), Torino, Italy
- MRC-PHE Centre for Environment & Health, Imperial College, London, United Kingdom
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22
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Boysen G, Shimoni A, Danylesko I, Varda-Bloom N, Nagler A. A simplified method for detection of N-terminal valine adducts in patients receiving treosulfan. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2019; 33:1635-1642. [PMID: 31240802 PMCID: PMC6817381 DOI: 10.1002/rcm.8509] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/07/2019] [Accepted: 06/18/2019] [Indexed: 05/02/2023]
Abstract
RATIONALE Treosulfan is a substance that is being studied as part of the conditioning regimen given prior to allogeneic stem cell transplantation in patients with hematological malignancies. It is known to decompose into 1,2:3,4-diepoxybutane (DEB) under physiologic conditions. In this study, we investigate whether N-terminal valine adducts can be utilized to monitor differences in DEB formation of patients receiving treosulfan as part of the conditioning regimen for transplantation. METHODS Blood samples were collected from a group of 14 transplant recipients and analyzed for N,N-(2,3-dihydroxy-1,4-butadiyl)valine (pyr-Val) and 2,3,4-trihydroxybutylvaline (THB-Val) adducts as biomarkers for drug uptake and metabolism before treosulfan treatment and 6 days after treatment. RESULTS A new direct injection liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was developed and validated prior to clinical analysis. The assay precision was determined by 3 replicate analyses on 3 individual days using control globin spiked with known amounts of pyr-Val and THB-Val. The intra- and inter-day precision coefficients of variance (CVs) and accuracy were < 10% and 15%, respectively. In clinical specimens, the means ± SD of pyr-Val and THB-Val background were 0.29 ± 0.10 pmol/g HB and 5.17 ± 1.7 pmol/g HB, respectively. CONCLUSIONS These values are similar to those found previously. Treosulfan treatment leads to a significant increase in pyr-Val and THB-Val adducts in each patient (Student's t-test p <0.0001). The mean ± SD amounts of adduct formed were 245.3 ± 89.6 and 210 ± 78.5 pmol/g globin for pyr-Val and THB-Val, respectively. Importantly, these results show that this direct injection method can quantitate both background and treosulfan-induced pyr-Val and THB-Val N-terminal valine globin adducts in humans.
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Affiliation(s)
- Gunnar Boysen
- Department of Environmental and Occupational Health, The University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
- The Winthrop P. Rockefeller Cancer Institute, The University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Avichai Shimoni
- Division of Hematology and Bone Marrow Transplantation, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - Ivetta Danylesko
- Division of Hematology and Bone Marrow Transplantation, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - Nira Varda-Bloom
- Division of Hematology and Bone Marrow Transplantation, Chaim Sheba Medical Center, Tel-Hashomer, Israel
| | - Arnon Nagler
- Division of Hematology and Bone Marrow Transplantation, Chaim Sheba Medical Center, Tel-Hashomer, Israel
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23
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Preston GW, Phillips DH. Protein Adductomics: Analytical Developments and Applications in Human Biomonitoring. TOXICS 2019; 7:E29. [PMID: 31130613 PMCID: PMC6631498 DOI: 10.3390/toxics7020029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 05/16/2019] [Accepted: 05/20/2019] [Indexed: 02/07/2023]
Abstract
Proteins contain many sites that are subject to modification by electrophiles. Detection and characterisation of these modifications can give insights into environmental agents and endogenous processes that may be contributing factors to chronic human diseases. An untargeted approach, utilising mass spectrometry to detect modified amino acids or peptides, has been applied to blood proteins haemoglobin and albumin, focusing in particular on the N-terminal valine residue of haemoglobin and the cysteine-34 residue in albumin. Technical developments to firstly detect simultaneously multiple adducts at these sites and then subsequently to identify them are reviewed here. Recent studies in which the methods have been applied to biomonitoring human exposure to environmental toxicants are described. With advances in sensitivity, high-throughput handling of samples and robust quality control, these methods have considerable potential for identifying causes of human chronic disease and of identifying individuals at risk.
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Affiliation(s)
- George W Preston
- Environmental Research Group, Department of Analytical, Environmental and Forensic Science, School of Population Health and Environmental Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK.
| | - David H Phillips
- Environmental Research Group, Department of Analytical, Environmental and Forensic Science, School of Population Health and Environmental Sciences, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK.
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24
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Zatloukalova M, Mojovic M, Pavicevic A, Kabelac M, Freeman BA, Pekarova M, Vacek J. Redox properties and human serum albumin binding of nitro-oleic acid. Redox Biol 2019; 24:101213. [PMID: 31170679 PMCID: PMC6554544 DOI: 10.1016/j.redox.2019.101213] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/30/2019] [Accepted: 05/01/2019] [Indexed: 12/27/2022] Open
Abstract
Nitro-fatty acids modulate inflammatory and metabolic stress responses, thus displaying potential as new drug candidates. Herein, we evaluate the redox behavior of nitro-oleic acid (NO2-OA) and its ability to bind to the fatty acid transporter human serum albumin (HSA). The nitro group of NO2-OA underwent electrochemical reduction at -0.75 V at pH 7.4 in an aqueous milieu. Based on observations of the R-NO2 reduction process, the stability and reactivity of NO2-OA was measured in comparison to oleic acid (OA) as the negative control. These electrochemically-based results were reinforced by computational quantum mechanical modeling. DFT calculations indicated that both the C9-NO2 and C10-NO2 positional isomers of NO2-OA occurred in two conformers with different internal angles (69° and 110°) between the methyl- and carboxylate termini. Both NO2-OA positional isomers have LUMO energies of around -0.7 eV, affirming the electrophilic properties of fatty acid nitroalkenes. In addition, the binding of NO2-OA and OA with HSA revealed a molar ratio of ~7:1 [NO2-OA]:[HSA]. These binding experiments were performed using both an electrocatalytic approach and electron paramagnetic resonance (EPR) spectroscopy using 16-doxyl stearic acid. Using a Fe(DTCS)2 spin-trap, EPR studies also showed that the release of the nitro moiety of NO2-OA resulted in the formation of nitric oxide radical. Finally, the interaction of NO2-OA with HSA was monitored via Tyr and Trp residue electro-oxidation. The results indicate that not only non-covalent binding but also NO2-OA-HSA adduction mechanisms should be taken into consideration. This study of the redox properties of NO2-OA is applicable to the characterization of other electrophilic mediators of biological and pharmacological relevance.
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Affiliation(s)
- Martina Zatloukalova
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic
| | - Milos Mojovic
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia
| | - Aleksandra Pavicevic
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, Serbia
| | - Martin Kabelac
- Department of Chemistry, Faculty of Science, University of South Bohemia, Branisovska 31, Ceske Budejovice 370 05, Czech Republic
| | - Bruce A Freeman
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh PA, 15261, USA
| | - Michaela Pekarova
- The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno 612 65, Czech Republic
| | - Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic; The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno 612 65, Czech Republic.
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25
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Yano Y, Grigoryan H, Schiffman C, Edmands W, Petrick L, Hall K, Whitehead T, Metayer C, Dudoit S, Rappaport S. Untargeted adductomics of Cys34 modifications to human serum albumin in newborn dried blood spots. Anal Bioanal Chem 2019; 411:2351-2362. [PMID: 30783713 PMCID: PMC6461474 DOI: 10.1007/s00216-019-01675-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 12/06/2018] [Accepted: 02/06/2019] [Indexed: 02/06/2023]
Abstract
Metabolism of chemicals from the diet, exposures to xenobiotics, the microbiome, and lifestyle factors (e.g., smoking, alcohol intake) produce electrophiles that react with nucleophilic sites in circulating proteins, notably Cys34 of human serum albumin (HSA). To discover potential risk factors resulting from in utero exposures, we are investigating HSA-Cys34 adducts in archived newborn dried blood spots (DBS) that reflect systemic exposures during the last month of gestation. The workflow includes extraction of proteins from DBS, measurement of hemoglobin (Hb) to normalize for blood volume, addition of methanol to enrich HSA by precipitation of Hb and other interfering proteins, digestion with trypsin, and detection of HSA-Cys34 adducts via nanoflow liquid chromatography-high-resolution mass spectrometry. As proof-of-principle, we applied the method to 49 archived DBS collected from newborns whose mothers either actively smoked during pregnancy or were nonsmokers. Twenty-six HSA-Cys34 adducts were detected, including Cys34 oxidation products, mixed disulfides with low molecular weight thiols (e.g., cysteine, homocysteine, glutathione, cysteinylglycine), and other modifications. Data were normalized with a novel method ("scone") to remove unwanted technical variation arising from HSA digestion, blood volume, DBS age, mass spectrometry analysis, and batch effects. Using an ensemble of linear and nonlinear models, the Cys34 adduct of cyanide was found to consistently discriminate between newborns of smoking and nonsmoking mothers with a mean fold change (smoking/nonsmoking) of 1.31. These results indicate that DBS adductomics is suitable for investigating in utero exposures to reactive chemicals and metabolites that may influence disease risks later in life.
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Affiliation(s)
- Yukiko Yano
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Courtney Schiffman
- Division of Biostatistics, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - William Edmands
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Lauren Petrick
- The Senator Frank R. Lautenberg Environmental Health Sciences Laboratory, Department of Environmental Medicine and Public Health, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Katie Hall
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Todd Whitehead
- Division of Epidemiology, School of Public Health, University of California, Berkeley, CA, 94720, USA
- Center for Integrative Research on Childhood Leukemia and the Environment, University of California, Berkeley, CA, 94720, USA
| | - Catherine Metayer
- Division of Epidemiology, School of Public Health, University of California, Berkeley, CA, 94720, USA
- Center for Integrative Research on Childhood Leukemia and the Environment, University of California, Berkeley, CA, 94720, USA
| | - Sandrine Dudoit
- Division of Biostatistics, School of Public Health, University of California, Berkeley, CA, 94720, USA
| | - Stephen Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, 94720, USA.
- Center for Integrative Research on Childhood Leukemia and the Environment, University of California, Berkeley, CA, 94720, USA.
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26
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Carlsson H, Rappaport SM, Törnqvist M. Protein Adductomics: Methodologies for Untargeted Screening of Adducts to Serum Albumin and Hemoglobin in Human Blood Samples. High Throughput 2019; 8:E6. [PMID: 30857166 PMCID: PMC6473736 DOI: 10.3390/ht8010006] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 02/26/2019] [Accepted: 02/27/2019] [Indexed: 11/16/2022] Open
Abstract
The reaction products of electrophiles in vivo can be measured as adducts to the abundant proteins, hemoglobin (Hb), and human serum albumin (HSA), in human blood samples. During the last decade, methods for untargeted screening of such adducts, called "adductomics", have used liquid chromatography-mass spectrometry to detect large numbers of previously unknown Hb and HSA adducts. This review presents methodologies that were developed and used in our laboratories for Hb and HSA adductomics, respectively. We discuss critical aspects regarding choice of target protein, sample preparation, mass spectrometry, data evaluation, and strategies for identification of detected unknown adducts. With this review we give an overview of these two methodologies used for protein adductomics and the precursor electrophiles that have been elucidated from the adducts.
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Affiliation(s)
- Henrik Carlsson
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720, USA.
| | - Stephen M Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720, USA.
| | - Margareta Törnqvist
- Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
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27
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Grigoryan H, Edmands WMB, Lan Q, Carlsson H, Vermeulen R, Zhang L, Yin SN, Li GL, Smith MT, Rothman N, Rappaport SM. Adductomic signatures of benzene exposure provide insights into cancer induction. Carcinogenesis 2019. [PMID: 29538615 DOI: 10.1093/carcin/bgy042] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Although benzene has long been recognized as a cause of human leukemia, the mechanism by which this simple molecule causes cancer has been problematic. A complicating factor is benzene metabolism, which produces many reactive intermediates, some specific to benzene and others derived from redox processes. Using archived serum from 20 nonsmoking Chinese workers, 10 with and 10 without occupational exposure to benzene (exposed: 3.2-88.9 ppm, controls: 0.002-0.020 ppm), we employed an adductomic pipeline to characterize protein modifications at Cys34 of human serum albumin, a nucleophilic hotspot in extracellular fluids. Of the 47 measured human serum albumin modifications, 39 were present at higher concentrations in benzene-exposed workers than in controls and many of the exposed-control differences were statistically significant. Correlation analysis identified three prominent clusters of adducts, namely putative modifications by benzene oxide and a benzene diolepoxide that grouped with other measures of benzene exposure, adducts of reactive oxygen and carbonyl species, and Cys34 disulfides of small thiols that are formed following oxidation of Cys34. Benzene diolepoxides are potent mutagens and carcinogens that have received little attention as potential causes of human leukemia. Reactive oxygen and carbonyl species-generated by redox processes involving polyphenolic benzene metabolites and by Cyp2E1 regulation following benzene exposure-can modify DNA and proteins in ways that contribute to cancer. The fact that these diverse human serum albumin modifications differed between benzene-exposed and control workers suggests that benzene can increase leukemia risks via multiple pathways involving a constellation of reactive molecules.
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Affiliation(s)
- Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
| | - William M B Edmands
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
| | - Qing Lan
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Service, Rockville, MD, USA
| | - Henrik Carlsson
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
| | - Roel Vermeulen
- Division of Environmental Epidemiology, Institute for Risk Assessment Sciences, Utrecht University, TD Utrecht, The Netherlands
| | - Luoping Zhang
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
| | - Song-Nian Yin
- National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Gui-Lan Li
- National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Martyn T Smith
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
| | - Nathaniel Rothman
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Service, Rockville, MD, USA
| | - Stephen M Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, USA
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28
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Cooke MS, Hu CW, Chang YJ, Chao MR. Urinary DNA adductomics - A novel approach for exposomics. ENVIRONMENT INTERNATIONAL 2018; 121:1033-1038. [PMID: 30392940 PMCID: PMC6279464 DOI: 10.1016/j.envint.2018.10.041] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/01/2018] [Accepted: 10/20/2018] [Indexed: 05/07/2023]
Abstract
The exposome is a concept that encompasses the totality of internal and external environmental exposures, from conception onwards. Evaluation of the exposome, across the lifecourse represents a significant challenge, e.g., methods/technology may simply not exist to comprehensively assess all exposures, or they may not be applicable to human populations, or may have insufficient sensitivity. Cellular DNA adductomics aims to determine the totality of DNA adducts in the cellular genome. However, application to human populations requires the necessarily invasive sampling of tissue, to obtain sufficient DNA for sensitive analysis, which can represent a logistical and IRB challenge, particularly when investigating vulnerable populations. To circumvent this, we recently applied DNA adductomics to urine, detecting a range of expected and unexpected 2'-deoxyribonucleoside DNA adducts. However, base excision repair, the main DNA repair pathway for non-bulky DNA adducts, and processes such as spontaneous depurination, generate nucleobase adducts. Herein we propose a strategy to simultaneously assess 2'-deoxyribonucleoside and nucleobase adducts, using a widely used mass spectrometic platform (i.e., triple quadrupole tandem mass spectrometry). This will provide a much needed DNA adductomic approach for non-invasively, biomonitoring environmental exposures, through assessing the totality of DNA adducts; contributing to the evaluation of the exposome, across the life-course.
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Affiliation(s)
- Marcus S Cooke
- Oxidative Stress Group, Department of Environmental Health Sciences, Florida International University, Miami, FL 33199, USA; Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA.
| | - Chiung-Wen Hu
- Oxidative Stress Group, Department of Environmental Health Sciences, Florida International University, Miami, FL 33199, USA; Department of Public Health, Chung Shan Medical University, Taichung 402, Taiwan
| | - Yuan-Jhe Chang
- Department of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan
| | - Mu-Rong Chao
- Oxidative Stress Group, Department of Environmental Health Sciences, Florida International University, Miami, FL 33199, USA; Department of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan; Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan.
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29
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Degner A, Carlsson H, Karlsson I, Eriksson J, Pujari SS, Tretyakova NY, Törnqvist M. Discovery of Novel N-(4-Hydroxybenzyl)valine Hemoglobin Adducts in Human Blood. Chem Res Toxicol 2018; 31:1305-1314. [PMID: 30375232 DOI: 10.1021/acs.chemrestox.8b00173] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Humans are exposed to a wide range of electrophilic compounds present in our diet and environment or formed endogenously as part of normal physiological processes. These electrophiles can modify nucleophilic sites of proteins and DNA to form covalent adducts. Recently, powerful untargeted adductomic approaches have been developed for systematic screening of these adducts in human blood. Our earlier untargeted adductomics study detected 19 unknown adducts to N-terminal valine in hemoglobin (Hb) in human blood. We now describe a full characterization of one of these adducts, which corresponds to the addition of a 4-hydroxybenzyl (4-OHBn) group to N-terminal valine in Hb to form N(4-hydroxybenzyl)valine (4-OHBn-Val). The adduct structure was determined by comparison of its accurate mass, HPLC retention time, and MS/MS fragmentation to that of authentic standards prepared by chemical synthesis. Average 4-OHBn-Val adduct concentrations in 12 human blood samples were estimated to 380 ± 160 pmol/g Hb. Two possible routes of 4-OHBnVal adduct formation are proposed using two different precursor electrophiles: 4-quinone methide (4-QM) and 4-hydroxybenzaldehyde (4-OHBA). We found that 4-QM reacts rapidly with valine to form the 4-OHBn-Val adduct; however, the quinone methide is unstable under physiological conditions due to hydrolysis. It was shown that 4-OHBA forms reversible Schiff base adducts with valine, which can be stabilized via reduction in blood generating the 4-OHBn-Val adduct. In addition, trace amounts of isomeric 2-hydroxybenzyl-valine (2-OHBn-Val) adducts were detected in 12 human blood samples (estimated mean adduct level, 5.0 ± 1.4 pmol/g Hb). Further studies are needed to quantify the contributions from identified possible precursor electrophiles to the observed hydroxybenzyl adducts in humans.
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Affiliation(s)
- Amanda Degner
- Department of Medicinal Chemistry and the Masonic Cancer Center , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Henrik Carlsson
- Department of Environmental Science and Analytical Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden
| | - Isabella Karlsson
- Department of Environmental Science and Analytical Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden
| | - Johan Eriksson
- Department of Environmental Science and Analytical Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden
| | - Suresh S Pujari
- Department of Medicinal Chemistry and the Masonic Cancer Center , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Natalia Y Tretyakova
- Department of Medicinal Chemistry and the Masonic Cancer Center , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - Margareta Törnqvist
- Department of Environmental Science and Analytical Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden
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30
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Redefining environmental exposure for disease etiology. NPJ Syst Biol Appl 2018; 4:30. [PMID: 30181901 PMCID: PMC6119193 DOI: 10.1038/s41540-018-0065-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/14/2018] [Accepted: 05/23/2018] [Indexed: 12/16/2022] Open
Abstract
Etiological studies of human exposures to environmental factors typically rely on low-throughput methods that target only a few hundred chemicals or mixtures. In this Perspectives article, I outline how environmental exposure can be defined by the blood exposome—the totality of chemicals circulating in blood. The blood exposome consists of chemicals derived from both endogenous and exogenous sources. Endogenous chemicals are represented by the human proteome and metabolome, which establish homeostatic networks of functional molecules. Exogenous chemicals arise from diet, vitamins, drugs, pathogens, microbiota, pollution, and lifestyle factors, and can be measured in blood as subsets of the proteome, metabolome, metals, macromolecular adducts, and foreign DNA and RNA. To conduct ‘exposome-wide association studies’, blood samples should be obtained prospectively from subjects—preferably at critical stages of life—and then analyzed in incident disease cases and matched controls to find discriminating exposures. Results from recent metabolomic investigations of archived blood illustrate our ability to discover potentially causal exposures with current technologies.
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31
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Enerstvedt KS, Sydnes MO, Larssen E, Pampanin DM. Screening for protein adducts of naphthalene and chrysene in plasma of exposed Atlantic cod (Gadus morhua). CHEMOSPHERE 2018; 200:67-79. [PMID: 29475030 DOI: 10.1016/j.chemosphere.2018.02.091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 02/14/2018] [Accepted: 02/15/2018] [Indexed: 06/08/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are well known contaminants, ubiquitously present in the habitat and spawning areas for Atlantic cod (Gadus morhua). The Atlantic cod is a key species and a globally important food source, thus continuous monitoring of PAHs is considered highly valuable to ensure ecosystem sustainability and human food safety. PAH adducts to plasma proteins are applied as sensitive biomarkers of PAH exposure in humans and other species, thus the presence of PAH protein adducts in Atlantic cod plasma was investigated to identify PAH protein adduct biomarker candidates of exposure to PAHs. Blood plasma samples were collected from Atlantic cod (n = 66) one week after exposure by intramuscular injection of single PAHs (i.e. naphthalene and chrysene), and their corresponding dihydrodiol metabolites (i.e. (-)-(1R,2R)-1,2-dihydronaphthalene-1,2-diol and (-)-(1R,2R)-1,2-dihydrochrysene-1,2-diol). The samples were analyzed by shotgun tandem mass spectrometry (MS) and the resulting MS data were analyzed in Byonic™ to screen for proteins susceptible to adduct formation with naphthalene and chrysene. Furthermore, a wildcard modification search was performed to obtain additional information regarding potential modifications other than the targeted metabolites. The amino acid adductation sites and the metabolites involved in PAH adductation are reported. Forty-four proteins were found to bind PAHs. Alpha-2-macroglobulin-like proteins, apolipoproteins B-100-like proteins and an alpha-2-HS-glycoprotein were detected with the highest number of bound PAHs. This first insight into PAH protein adducts of Atlantic cod plasma generates valuable knowledge for the development of highly sensitive biomarkers of PAH exposure.
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Affiliation(s)
- Karianne S Enerstvedt
- International Research Institute of Stavanger (IRIS) - Environment Department, Mekjarvik 12, NO-4070 Randaberg, Norway; Faculty of Science and Technology, Department of Mathematics and Natural Science, University of Stavanger, NO-4036 Stavanger, Norway
| | - Magne O Sydnes
- Faculty of Science and Technology, Department of Mathematics and Natural Science, University of Stavanger, NO-4036 Stavanger, Norway
| | - Eivind Larssen
- International Research Institute of Stavanger (IRIS) - Environment Department, Mekjarvik 12, NO-4070 Randaberg, Norway
| | - Daniela M Pampanin
- International Research Institute of Stavanger (IRIS) - Environment Department, Mekjarvik 12, NO-4070 Randaberg, Norway; Faculty of Science and Technology, Department of Mathematics and Natural Science, University of Stavanger, NO-4036 Stavanger, Norway.
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32
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Suitability of biomarkers of biological effects (BOBEs) for assessing the likelihood of reducing the tobacco related disease risk by new and innovative tobacco products: A literature review. Regul Toxicol Pharmacol 2018; 94:203-233. [DOI: 10.1016/j.yrtph.2018.02.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 02/04/2018] [Accepted: 02/05/2018] [Indexed: 02/07/2023]
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Pleil JD, Wallace MAG, Stiegel MA, Funk WE. Human biomarker interpretation: the importance of intra-class correlation coefficients (ICC) and their calculations based on mixed models, ANOVA, and variance estimates. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2018; 21:161-180. [PMID: 30067478 PMCID: PMC6704467 DOI: 10.1080/10937404.2018.1490128] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Human biomonitoring is the foundation of environmental toxicology, community public health evaluation, preclinical health effects assessments, pharmacological drug development and testing, and medical diagnostics. Within this framework, the intra-class correlation coefficient (ICC) serves as an important tool for gaining insight into human variability and responses and for developing risk-based assessments in the face of sparse or highly complex measurement data. The analytical procedures that provide data for clinical and public health efforts are continually evolving to expand our knowledge base of the many thousands of environmental and biomarker chemicals that define human systems biology. These chemicals range from the smallest molecules from energy metabolism (i.e., the metabolome), through larger molecules including enzymes, proteins, RNA, DNA, and adducts. In additiona, the human body contains exogenous environmental chemicals and contributions from the microbiome from gastrointestinal, pulmonary, urogenital, naso-pharyngeal, and skin sources. This complex mixture of biomarker chemicals from environmental, human, and microbiotic sources comprise the human exposome and generally accessed through sampling of blood, breath, and urine. One of the most difficult problems in biomarker assessment is assigning probative value to any given set of measurements as there are generally insufficient data to distinguish among sources of chemicals such as environmental, microbiotic, or human metabolism and also deciding which measurements are remarkable from those that are within normal human variability. The implementation of longitudinal (repeat) measurement strategies has provided new statistical approaches for interpreting such complexities, and use of descriptive statistics based upon intra-class correlation coefficients (ICC) has become a powerful tool in these efforts. This review has two parts; the first focuses on the history of repeat measures of human biomarkers starting with occupational toxicology of the early 1950s through modern applications in interpretation of the human exposome and metabolic adverse outcome pathways (AOPs). The second part reviews different methods for calculating the ICC and explores the strategies and applications in light of different data structures.
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Affiliation(s)
- Joachim D. Pleil
- Office of Research and Development, US Environmental Protection Agency (EPA), Research Triangle Park, NC, USA
| | - M. Ariel Geer Wallace
- Office of Research and Development, US Environmental Protection Agency (EPA), Research Triangle Park, NC, USA
| | - Matthew A. Stiegel
- Department of Occupational and Environmental Safety, Duke University Medical Center, Durham, NC, USA
| | - William E. Funk
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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34
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Preston G, Plusquin M, Sozeri O, van Veldhoven K, Bastian L, Nawrot TS, Chadeau-Hyam M, Phillips DH. Refinement of a Methodology for Untargeted Detection of Serum Albumin Adducts in Human Populations. Chem Res Toxicol 2017; 30:2120-2129. [PMID: 29092396 PMCID: PMC5736992 DOI: 10.1021/acs.chemrestox.7b00186] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Indexed: 11/29/2022]
Abstract
Covalently modified blood proteins (e.g., serum albumin adducts) are increasingly being viewed as potential biomarkers via which the environmental causes of human diseases may be understood. The notion that some (perhaps many) modifications have yet to be discovered has led to the development of untargeted adductomics methods, which attempt to capture entire populations of adducts. One such method is fixed-step selected reaction monitoring (FS-SRM), which analyses distributions of serum albumin adducts via shifts in the mass of a tryptic peptide [Li et al. (2011) Mol. Cell. Proteomics 10, M110.004606]. Working on the basis that FS-SRM might be able to detect biological variation due to environmental factors, we aimed to scale the methodology for use in an epidemiological setting. Development of sample preparation methods led to a batch workflow with increased throughput and provision for quality control. Challenges posed by technical and biological variation were addressed in the processing and interpretation of the data. A pilot study of 20 smokers and 20 never-smokers provided evidence of an effect of smoking on levels of putative serum albumin adducts. Differences between smokers and never-smokers were most apparent in putative adducts with net gains in mass between 105 and 114 Da (relative to unmodified albumin). The findings suggest that our implementation of FS-SRM could be useful for studying other environmental factors with relevance to human health.
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Affiliation(s)
- George
W. Preston
- MRC-PHE
Centre for Environment and Health, Department of Analytical, Environmental,
and Forensic Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
| | - Michelle Plusquin
- MRC-PHE
Centre for Environment and Health, Department of Epidemiology and
Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London W2 1PG, United Kingdom
- Centre
for Environmental Sciences, Hasselt University, 3590 Hasselt, Belgium
| | - Osman Sozeri
- MRC-PHE
Centre for Environment and Health, Department of Analytical, Environmental,
and Forensic Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
| | - Karin van Veldhoven
- MRC-PHE
Centre for Environment and Health, Department of Epidemiology and
Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London W2 1PG, United Kingdom
| | - Lilian Bastian
- MRC-PHE
Centre for Environment and Health, Department of Analytical, Environmental,
and Forensic Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
| | - Tim S. Nawrot
- Centre
for Environmental Sciences, Hasselt University, 3590 Hasselt, Belgium
- Environment
and Health Unit, Leuven University, 3000 Leuven, Belgium
| | - Marc Chadeau-Hyam
- MRC-PHE
Centre for Environment and Health, Department of Epidemiology and
Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London W2 1PG, United Kingdom
| | - David H. Phillips
- MRC-PHE
Centre for Environment and Health, Department of Analytical, Environmental,
and Forensic Sciences, Faculty of Life Sciences and Medicine, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
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35
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Parallelogram based approach for in vivo dose estimation of genotoxic metabolites in humans with relevance to reduction of animal experiments. Sci Rep 2017; 7:17560. [PMID: 29242644 PMCID: PMC5730592 DOI: 10.1038/s41598-017-17692-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 11/29/2017] [Indexed: 12/14/2022] Open
Abstract
When employing metabolism studies of genotoxic compounds/metabolites and cancer tests for risk estimation, low exposure doses in humans are roughly extrapolated from high exposure doses in animals. An improvement is to measure the in vivo dose, i.e. area under concentration-time curve (AUC), of the causative genotoxic agent. In the present work, we propose and evaluate a parallelogram based approach for estimation of the AUC of genotoxic metabolites that incorporates in vitro metabolic data and existing knowledge from published in vivo data on hemoglobin (Hb) adduct levels, using glycidamide (GA) as a case study compound that is the genotoxic metabolite of acrylamide (AA). The estimated value of AUC of GA per AUC of AA from the parallelogram approach vs. that from Hb adduct levels measured in vivo were in good agreement; 0.087 vs. 0.23 in human and 1.4 vs. 0.53 in rat, respectively. The described parallelogram approach is simple, and can be useful to provide an approximate estimation of the AUC of metabolites in humans at low exposure levels for which sensitive methods for analyzing the metabolites are not available, as well as aid in reduction of animal experiments for metabolism studies that are to be used for cancer risk assessment.
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36
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Proteomic Analysis of Thiol Modifications and Assessment of Structural Changes in Hemoglobin Induced by the Aniline Metabolites N-Phenylhydroxylamine and Nitrosobenzene. Sci Rep 2017; 7:14794. [PMID: 29093547 PMCID: PMC5665987 DOI: 10.1038/s41598-017-14653-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 10/13/2017] [Indexed: 11/19/2022] Open
Abstract
MS-based proteomic analysis was combined with in silico quantum mechanical calculations to improve understanding of protein adduction by N-phenylhydroxylamine (PhNHOH) and nitrosobenzene (NOB), metabolic products of aniline. In vitro adduction of model peptides containing nucleophilic sidechains (Cys, His, and Lys) and selected proteins (bovine and human hemoglobin and β-lactoglobulin-A) were characterized. Peptide studies identified the Cys thiolate as the most reactive nucleophile for these metabolites, a result consistent with in silico calculations of reactivity parameters. For PhNHOH, sulfinamides were identified as the primary adduction products, which were stable following tryptic digestion. Conversely, reactions with NOB yielded an additional oxidized adduct, the sulfonamide. In vitro exposure of human whole blood to PhNHOH and NOB demonstrated that only sulfinamides were formed. In addition to previously reported adduction of β93Cys of human Hb, two novel sites of adduction were found; α104Cys and β112Cys. We also report CD and UV-Vis spectroscopy studies of adducted human Hb that revealed loss of α-helical content and deoxygenation. The results provide additional understanding of the covalent interaction of aromatic amine metabolites with protein nucleophiles.
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Bessonneau V, Pawliszyn J, Rappaport SM. The Saliva Exposome for Monitoring of Individuals' Health Trajectories. ENVIRONMENTAL HEALTH PERSPECTIVES 2017; 125:077014. [PMID: 28743678 PMCID: PMC5801473 DOI: 10.1289/ehp1011] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 11/08/2016] [Accepted: 11/18/2016] [Indexed: 05/07/2023]
Abstract
BACKGROUND There is increasing evidence that environmental, rather than genetic, factors are the major causes of most chronic diseases. By measuring entire classes of chemicals in archived biospecimens, exposome-wide association studies (EWAS) are being conducted to investigate associations between a myriad of exposures received during life and chronic diseases. OBJECTIVES Because the intraindividual variability in biomarker levels, arising from changes in environmental exposures from conception onwards, leads to attenuation of exposure-disease associations, we posit that saliva can be collected repeatedly in longitudinal studies to reduce exposure-measurement errors in EWAS. METHODS From the literature and an open-source saliva-metabolome database, we obtained concentrations of 1,233 chemicals that had been detected in saliva. We connected salivary metabolites with human metabolic pathways and PubMed Medical Subject Heading (MeSH) terms, and performed pathway enrichment and pathway topology analyses. RESULTS One hundred ninety-six salivary metabolites were mapped into 49 metabolic pathways and connected with human metabolic diseases, central nervous system diseases, and neoplasms. We found that the saliva exposome represents at least 14 metabolic pathways, including amino acid metabolism, TCA cycle, gluconeogenesis, glutathione metabolism, pantothenate and CoA biosynthesis, and butanoate metabolism. CONCLUSIONS Saliva contains molecular information worthy of interrogation via EWAS. The simplicity of specimen collection suggests that saliva offers a practical alternative to blood for measurements that can be used to characterize individual exposomes. https://doi.org/10.1289/EHP1011.
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Affiliation(s)
- Vincent Bessonneau
- Department of Chemistry, University of Waterloo , Waterloo, Ontario, Canada
| | - Janusz Pawliszyn
- Department of Chemistry, University of Waterloo , Waterloo, Ontario, Canada
| | - Stephen M Rappaport
- Center for Exposure Biology, School of Public Health, University of California, Berkeley , Berkeley, California, USA
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Alternative sampling strategies for the assessment of biomarkers of exposure. CURRENT OPINION IN TOXICOLOGY 2017. [DOI: 10.1016/j.cotox.2017.05.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Slawik C, Rickmeyer C, Brehm M, Böhme A, Schüürmann G. Glutathione Adduct Patterns of Michael-Acceptor Carbonyls. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:4018-4026. [PMID: 28225253 DOI: 10.1021/acs.est.6b04981] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Glutathione (GSH) has so far been considered to facilitate detoxification of soft organic electrophiles through covalent binding at its cysteine (Cys) thiol group, followed by stepwise catalyzed degradation and eventual elimination along the mercapturic acid pathway. Here we show that in contrast to expectation from HSAB theory, Michael-acceptor ketones, aldehydes and esters may form also single, double and triple adducts with GSH involving β-carbon attack at the much harder N-terminus of the γ-glutamyl (Glu) unit of GSH. In particular, formation of the GSH-N single adduct contradicts the traditional view that S alkylation always forms the initial reaction of GSH with Michael-acceptor carbonyls. To this end, chemoassay analyses of the adduct formation of GSH with nine α,β-unsaturated carbonyls employing high performance liquid chromatography and tandem mass spectrometry have been performed. Besides enriching the GSH adductome and potential biomarker applications, electrophilic N-terminus functionalization is likely to impair GSH homeostasis substantially through blocking the γ-glutamyl transferase catalysis of the first breakdown step of modified GSH, and thus its timely reconstitution. The discussion includes a comparison with cyclic adducts of GSH and furan metabolites as reported in literature, and quantum chemically calculated thermodynamics of hard-hard, hard-soft, and soft-soft adducts.
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Affiliation(s)
- Christian Slawik
- UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research , Permoserstraße 15, 04318 Leipzig, Germany
- Institute for Organic Chemistry, Technical University Bergakademie Freiberg , Leipziger Straße 29, 09596 Freiberg, Germany
| | - Christiane Rickmeyer
- UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research , Permoserstraße 15, 04318 Leipzig, Germany
| | - Martin Brehm
- UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research , Permoserstraße 15, 04318 Leipzig, Germany
| | - Alexander Böhme
- UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research , Permoserstraße 15, 04318 Leipzig, Germany
| | - Gerrit Schüürmann
- UFZ Department of Ecological Chemistry, Helmholtz Centre for Environmental Research , Permoserstraße 15, 04318 Leipzig, Germany
- Institute for Organic Chemistry, Technical University Bergakademie Freiberg , Leipziger Straße 29, 09596 Freiberg, Germany
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Holland N. Future of environmental research in the age of epigenomics and exposomics. REVIEWS ON ENVIRONMENTAL HEALTH 2017; 32:45-54. [PMID: 27768585 PMCID: PMC5346048 DOI: 10.1515/reveh-2016-0032] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 09/15/2016] [Indexed: 05/14/2023]
Abstract
Environmental research and public health in the 21st century face serious challenges such as increased air pollution and global warming, widespread use of potentially harmful chemicals including pesticides, plasticizers, and other endocrine disruptors, and radical changes in nutrition and lifestyle typical of modern societies. In particular, exposure to environmental and occupational toxicants may contribute to the occurrence of adverse birth outcomes, neurodevelopmental deficits, and increased risk of cancer and other multifactorial diseases such as diabetes and asthma. Rapidly evolving methodologies of exposure assessment and the conceptual framework of the Exposome, first introduced in 2005, are new frontiers of environmental research. Metabolomics and adductomics provide remarkable opportunities for a better understanding of exposure and prediction of potential adverse health outcomes. Metabolomics, the study of metabolism at whole-body level, involves assessment of the total repertoire of small molecules present in a biological sample, shedding light on interactions between gene expression, protein expression, and the environment. Advances in genomics, transcriptomics, and epigenomics are generating multidimensional structures of biomarkers of effect and susceptibility, increasingly important for the understanding of molecular mechanisms and the emergence of personalized medicine. Epigenetic mechanisms, particularly DNA methylation and miRNA expression, attract increasing attention as potential links between the genetic and environmental determinants of health and disease. Unlike genetics, epigenetic mechanisms could be reversible and an understanding of their role may lead to better protection of susceptible populations and improved public health.
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Sabbioni G, Turesky RJ. Biomonitoring Human Albumin Adducts: The Past, the Present, and the Future. Chem Res Toxicol 2017; 30:332-366. [PMID: 27989119 PMCID: PMC5241710 DOI: 10.1021/acs.chemrestox.6b00366] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Indexed: 12/21/2022]
Abstract
Serum albumin (Alb) is the most abundant protein in blood plasma. Alb reacts with many carcinogens and/or their electrophilic metabolites. Studies conducted over 20 years ago showed that Alb forms adducts with the human carcinogens aflatoxin B1 and benzene, which were successfully used as biomarkers in molecular epidemiology studies designed to address the role of these chemicals in cancer risk. Alb forms adducts with many therapeutic drugs or their reactive metabolites such as β-lactam antibiotics, acetylsalicylic acid, acetaminophen, nonsteroidal anti-inflammatory drugs, chemotherapeutic agents, and antiretroviral therapy drugs. The identification and characterization of the adduct structures formed with Alb have served to understand the generation of reactive metabolites and to predict idiosyncratic drug reactions and toxicities. The reaction of candidate drugs with Alb is now exploited as part of the battery of screening tools to assess the potential toxicities of drugs. The use of gas chromatography-mass spectrometry, liquid chromatography, or liquid chromatography-mass spectrometry (LC-MS) enabled the identification and quantification of multiple types of Alb xenobiotic adducts in animals and humans during the past three decades. In this perspective, we highlight the history of Alb as a target protein for adduction to environmental and dietary genotoxicants, pesticides, and herbicides, common classes of medicinal drugs, and endogenous electrophiles, and the emerging analytical mass spectrometry technologies to identify Alb-toxicant adducts in humans.
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Affiliation(s)
- Gabriele Sabbioni
- Institute of Environmental and Occupational Toxicology, CH-6780 Airolo, Switzerland
- Alpine Institute of Chemistry and Toxicology, CH-6718 Olivone, Switzerland
- Walther-Straub-Institut für Pharmakologie
und Toxikologie, Ludwig-Maximilians-Universität München, D-80336 München, Germany
| | - Robert J. Turesky
- Masonic Cancer Center and Department of
Medicinal Chemistry, College of Pharmacy, University of Minnesota, 2231 Sixth Street SE, Minneapolis, Minnesota 55455, United States
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Carlsson H, Törnqvist M. An Adductomic Approach to Identify Electrophiles In Vivo. Basic Clin Pharmacol Toxicol 2017; 121 Suppl 3:44-54. [DOI: 10.1111/bcpt.12715] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 11/22/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Henrik Carlsson
- Department of Environmental Science and Analytical Chemistry; Stockholm University; Stockholm Sweden
| | - Margareta Törnqvist
- Department of Environmental Science and Analytical Chemistry; Stockholm University; Stockholm Sweden
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Lu SS, Grigoryan H, Edmands WM, Hu W, Iavarone AT, Hubbard A, Rothman N, Vermeulen R, Lan Q, Rappaport SM. Profiling the Serum Albumin Cys34 Adductome of Solid Fuel Users in Xuanwei and Fuyuan, China. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:46-57. [PMID: 27936627 PMCID: PMC5567851 DOI: 10.1021/acs.est.6b03955] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Xuanwei and Fuyuan counties in China have the highest lung cancer rates in the world due to household air pollution from combustion of smoky coal for cooking and heating. To discover potential biomarkers of indoor combustion products, we profiled adducts at the Cys34 locus of human serum albumin (HSA) in 29 nonsmoking Xuanwei and Fuyuan females who used smoky coal, smokeless coal, or wood and 10 local controls who used electricity or gas fuel. Our untargeted "adductomics" method detected 50 tryptic peptides of HSA, containing Cys34 and prominent post-translational modifications. Putative adducts included Cys34 oxidation products, mixed disulfides, rearrangements, and truncations. The most significant differences in adduct levels across fuel types were observed for S-glutathione (S-GSH) and S-γ-glutamylcysteine (S-γ-GluCys), both of which were present at lower levels in subjects exposed to combustion products than in controls. After adjustment for age and personal measurements of airborne benzo(a)pyrene, the largest reductions in levels of S-GSH and S-γ-GluCys relative to controls were observed for users of smoky coal, compared to users of smokeless coal and wood. These results point to possible depletion of GSH, an essential antioxidant, and its precursor γ-GluCys in nonsmoking females exposed to indoor-combustion products in Xuanwei and Fuyuan, China.
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Affiliation(s)
- Sixin S. Lu
- Department of Nutritional Sciences and Toxicology, College of Natural Resources, University of California, Berkeley, CA 94720, USA
| | - Hasmik Grigoryan
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720, USA
| | - William M.B. Edmands
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720, USA
| | - Wei Hu
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Service, Rockville, MD 20850, USA
| | - Anthony T. Iavarone
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720, USA
| | - Alan Hubbard
- Division of Biostatistics, School of Public Health, University of California, Berkeley, CA 94720, USA
| | - Nathaniel Rothman
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Service, Rockville, MD 20850, USA
| | - Roel Vermeulen
- Division of Environmental Epidemiology, Institute for Risk Assessment Sciences, Utrecht University, 3508 TD Utrecht, The Netherlands
| | - Qing Lan
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Service, Rockville, MD 20850, USA
| | - Stephen M. Rappaport
- Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720, USA
- Corresponding author: Prof. S. M. Rappaport, Center for Exposure Biology, School of Public Health, University of California, Berkeley, CA 94720, USA. Tel: 510-642-4255. Fax: 510-642-5815.
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Acosta-Martin AE, Antinori P, Uppugunduri CRS, Daali Y, Ansari M, Scherl A, Müller M, Lescuyer P. Detection of busulfan adducts on proteins. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:2517-2528. [PMID: 27599297 DOI: 10.1002/rcm.7730] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 08/26/2016] [Accepted: 08/29/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Busulfan is a bifunctional alkyl sulfonate antineoplastic drug. This alkylating agent was described as forming covalent adducts on proteins. However, only limited data are available regarding the interaction of busulfan with proteins. Mass spectrometry and bioinformatics were used to identify busulfan adducts on human serum albumin and hemoglobin. METHODS Albumin and hemoglobin were incubated with busulfan or control compounds, digested with trypsin and analyzed by liquid chromatography/tandem mass spectrometry (LC/MS/MS) on a Thermo Fisher LTQ Orbitrap Velos Pro. MS data were used to generate spectral libraries of non-modified peptides and an open modification search was performed to identify potential adduct mass shifts and possible modification sites. Results were confirmed by a second database search including identified mass shifts and by visual inspection of annotated tandem mass spectra of adduct-carrying peptides. RESULTS Five structures of busulfan adducts were detected and a chemical structure could be attributed to four of them. Two were primary adducts corresponding to busulfan monoalkylation and alkylation of two amino acid residues by a single busulfan molecule. Two others corresponded to secondary adducts generated during sample processing. Adducts were mainly detected on Asp, Glu, and His residues. These findings were confirmed by subsequent database searches and experiments with synthetic peptides. CONCLUSIONS The combination of in vitro incubation of proteins with the drug of interest or control compounds, high-resolution mass spectrometry, and open modification search allowed confirmation of the direct interaction of busulfan with proteins and characterization of the resulting adducts. Our results also showed that careful analysis of the data is required to detect experimental artifacts. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Adelina E Acosta-Martin
- Department of Human Protein Science, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Paola Antinori
- Department of Human Protein Science, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Swiss Centre of Applied Human Toxicology, Geneva, Switzerland
| | - Chakradhara Rao S Uppugunduri
- Onco-Hematology Unit, Department of Pediatrics, Geneva University Hospitals, Geneva, Switzerland
- Cansearch Research Laboratory, Geneva Medical University, Geneva, Switzerland
| | - Youssef Daali
- Division of Clinical Pharmacology and Toxicology, Geneva University Hospitals, Geneva, Switzerland
| | - Marc Ansari
- Onco-Hematology Unit, Department of Pediatrics, Geneva University Hospitals, Geneva, Switzerland
- Cansearch Research Laboratory, Geneva Medical University, Geneva, Switzerland
| | - Alexander Scherl
- Department of Human Protein Science, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
- Swiss Centre of Applied Human Toxicology, Geneva, Switzerland
| | - Markus Müller
- SIB-Swiss Institute of Bioinformatics, University of Geneva, Switzerland
| | - Pierre Lescuyer
- Department of Human Protein Science, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- Division of Laboratory Medicine, Geneva University Hospitals, Geneva, Switzerland
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45
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Motwani HV, Westberg E, Törnqvist M. Interaction of benzo[a]pyrene diol epoxide isomers with human serum albumin: Site specific characterisation of adducts and associated kinetics. Sci Rep 2016; 6:36243. [PMID: 27805056 PMCID: PMC5090251 DOI: 10.1038/srep36243] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 10/12/2016] [Indexed: 01/17/2023] Open
Abstract
Carcinogenicity of benzo[a]pyrene {B[a]P, a polycyclic aromatic hydrocarbon (PAH)} involves DNA-modification by B[a]P diol epoxide (BPDE) metabolites. Adducts to serum albumin (SA) are not repaired, unlike DNA adducts, and therefore considered advantageous in assessment of in vivo dose of BPDEs. In the present work, kinetic experiments were performed in relation to the dose (i.e. concentration over time) of different BPDE isomers, where human SA (hSA) was incubated with respective BPDEs under physiological conditions. A liquid chromatography (LC) tandem mass spectrometry methodology was employed for characterising respective BPDE-adducts at histidine and lysine. This strategy allowed to structurally distinguish between the adducts from racemic anti- and syn-BPDE and between (+)- and (-)-anti-BPDE, which has not been attained earlier. The adduct levels quantified by LC-UV and the estimated rate of disappearance of BPDEs in presence of hSA gave an insight into the reactivity of the diol epoxides towards the N-sites on SA. The structure specific method and dosimetry described in this work could be used for accurate estimation of in vivo dose of the BPDEs following exposure to B[a]P, primarily in dose response studies of genotoxicity, e.g. in mice, to aid in quantitative risk assessment of PAHs.
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MESH Headings
- 7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide/chemistry
- 7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide/metabolism
- Algorithms
- Animals
- Chromatography, Liquid/methods
- DNA Adducts/chemistry
- Humans
- Isomerism
- Kinetics
- Mice
- Models, Chemical
- Molecular Structure
- Protein Binding
- Serum Albumin/chemistry
- Serum Albumin/metabolism
- Serum Albumin, Human/chemistry
- Serum Albumin, Human/metabolism
- Tandem Mass Spectrometry/methods
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Affiliation(s)
- Hitesh V. Motwani
- Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
| | - Emelie Westberg
- Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
| | - Margareta Törnqvist
- Department of Environmental Science and Analytical Chemistry, Stockholm University, SE-10691 Stockholm, Sweden
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46
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Grigoryan H, Edmands W, Lu SS, Yano Y, Regazzoni L, Iavarone AT, Williams ER, Rappaport SM. Adductomics Pipeline for Untargeted Analysis of Modifications to Cys34 of Human Serum Albumin. Anal Chem 2016; 88:10504-10512. [PMID: 27684351 PMCID: PMC5555296 DOI: 10.1021/acs.analchem.6b02553] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
An important but understudied class of human exposures is comprised of reactive electrophiles that cannot be measured in vivo because they are short-lived. An avenue for assessing these meaningful exposures focuses on adducts from reactions with nucleophilic loci of blood proteins, particularly Cys34 of human serum albumin, which is the dominant scavenger of reactive electrophiles in serum. We developed an untargeted analytical scheme and bioinformatics pipeline for detecting, quantitating, and annotating Cys34 adducts in tryptic digests of human serum/plasma. The pipeline interrogates tandem mass spectra to find signatures of the Cys34-containing peptide, obtains accurate masses of putative adducts, quantitates adduct levels relative to a "housekeeping peptide", and annotates modifications based on a combination of retention time, accurate mass, elemental composition, and database searches. We used the adductomics pipeline to characterize 43 adduct features in archived plasma from healthy human subjects and found several that were highly associated with smoking status, race, and other covariates. Since smoking is a strong risk factor for cancer and cardiovascular disease, our ability to discover adducts that distinguish smokers from nonsmokers with untargeted adductomics indicates that the pipeline is suitable for use in epidemiologic studies. In fact, adduct features were both positively and negatively associated with smoking, indicating that some adducts arise from reactions between Cys34 and constituents of cigarette smoke (e.g., ethylene oxide and acrylonitrile) while others (Cys34 oxidation products and disulfides) appear to reflect alterations in the serum redox state that resulted in reduced adduct levels in smokers.
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Affiliation(s)
- Hasmik Grigoryan
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
| | - William Edmands
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
| | - Sixin S. Lu
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
| | - Yukiko Yano
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
| | - Luca Regazzoni
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
| | - Anthony T. Iavarone
- California Institute for Quantitative Biosciences, University of California, Berkeley, California 94720, United States
| | - Evan R. Williams
- College of Chemistry, University of California, Berkeley, California 94720, United States
| | - Stephen M. Rappaport
- School of Public Health, University of California, Berkeley, California 94720-7356, United States
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Kabadi PG, Sankaran PK, Palanivelu DV, Adhikary L, Khedkar A, Chatterjee A. Mass Spectrometry Based Mechanistic Insights into Formation of Tris Conjugates: Implications on Protein Biopharmaceutics. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1677-1685. [PMID: 27488315 DOI: 10.1007/s13361-016-1447-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 06/23/2016] [Accepted: 07/05/2016] [Indexed: 06/06/2023]
Abstract
We present here extensive mass spectrometric studies on the formation of a Tris conjugate with a therapeutic monoclonal antibody. The results not only demonstrate the reactive nature of the Tris molecule but also the sequence and reaction conditions that trigger this reactivity. The results corroborate the fact that proteins are, in general, prone to conjugation and/or adduct formation reactions and any modification due to this essentially leads to formation of impurities in a protein sample. Further, the results demonstrate that the conjugation reaction happens via a succinimide intermediate and has sequence specificity. Additionally, the data presented in this study also shows that the Tris formation is produced in-solution and is not an in-source phenomenon. We believe that the facts given here will open further avenues on exploration of Tris as a conjugating agent as well as ensure that the use of Tris or any ionic buffer in the process of producing a biopharmaceutical drug is monitored closely for the presence of such conjugate formation. Graphical Abstract ᅟ.
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Affiliation(s)
- Pradeep G Kabadi
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India
| | - Praveen Kallamvalliillam Sankaran
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India
| | - Dinesh V Palanivelu
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India
| | - Laxmi Adhikary
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India
| | - Anand Khedkar
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India
| | - Amarnath Chatterjee
- Molecular Characterization Laboratory, Biocon Research Limited, Biocon Limited, Biocon Park, Bommasandra - Jigani Link Road, Bommasandra Industrial Area Phase IV, Bangalore, 560099, India.
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Chen HJC, Yang YF, Lai PY, Chen PF. Analysis of Chlorination, Nitration, and Nitrosylation of Tyrosine and Oxidation of Methionine and Cysteine in Hemoglobin from Type 2 Diabetes Mellitus Patients by Nanoflow Liquid Chromatography Tandem Mass Spectrometry. Anal Chem 2016; 88:9276-84. [PMID: 27541571 DOI: 10.1021/acs.analchem.6b02663] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The post-translational modification (PTM) of proteins by endogenous reactive chlorine, nitrogen, and oxygen species is implicated in certain pathological conditions, including diabetes mellitus. Evidence showed that the extents of modifications on a number of proteins are elevated in diabetic patients. Measuring modification on hemoglobin has been used to monitor the extent of exposure. This study develops an assay for simultaneous quantification of the extent of chlorination, nitration, and oxidation in human hemoglobin and to examine whether the level of any of these modifications is higher in poorly controlled type 2 diabetic mellitus patients. This mass spectrometry-based assay used the bottom-up proteomic strategy. Due to the low amount of endogenous modification, we first characterized the sites of chlorination at tyrosine in hypochlorous acid-treated hemoglobin by an accurate mass spectrometer. The extents of chlorination, nitration, and oxidation of a total of 12 sites and types of modifications in hemoglobin were measured by nanoflow liquid chromatography-nanospray ionization tandem mass spectrometry under the selected reaction monitoring mode. Relative quantification of these PTMs in hemoglobin extracted from blood samples shows that the extents of chlorination at α-Tyr-24, nitration at α-Tyr-42, and oxidation at the three methionine residues are significantly higher in diabetic patients (n = 19) than in nondiabetic individuals (n = 18). After excluding the factor of smoking, chlorination at α-Tyr-24, nitration at α-Tyr-42, and oxidation at the three methionine residues are significantly higher in the nonsmoking diabetic patients (n = 12) than in normal nonsmoking subjects (n = 11). Multiple regression analysis performed on the combined effect of age, body-mass index (BMI), and HbA1c showed that the diabetes factor HbA1c contributes significantly to the extent of chlorination at α-Tyr-24 in nonsmokers. In addition, age contributes to oxidation at α-Met-32 significantly in all subjects and in nonsmokers. These results suggest the potential of using chlorination at α-Tyr-24-containing peptide to evaluate protein damage in nonsmoking type 2 diabetes mellitus.
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Affiliation(s)
- Hauh-Jyun Candy Chen
- Department of Chemistry and Biochemistry, National Chung Cheng University , 168 University Road, Ming-Hsiung, Chia-Yi 62142, Taiwan
| | - Ya-Fen Yang
- Department of Chemistry and Biochemistry, National Chung Cheng University , 168 University Road, Ming-Hsiung, Chia-Yi 62142, Taiwan
| | - Pang-Yen Lai
- Department of Chemistry and Biochemistry, National Chung Cheng University , 168 University Road, Ming-Hsiung, Chia-Yi 62142, Taiwan
| | - Pin-Fan Chen
- Division of Metabolism and Endocrinology, Department of Internal Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation , Dalin, Chia-Yi 62247, Taiwan
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49
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Gabant G, Boyer A, Cadene M. SSPaQ: A Subtractive Segmentation Approach for the Exhaustive Parallel Quantification of the Extent of Protein Modification at Every Possible Site. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1328-1343. [PMID: 27245456 DOI: 10.1007/s13361-016-1416-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 04/19/2016] [Accepted: 04/24/2016] [Indexed: 06/05/2023]
Abstract
Protein modifications, whether chemically induced or post-translational (PTMs), play an essential role for the biological activity of proteins. Understanding biological processes and alterations thereof will rely on the quantification of these modifications on individual residues. Here we present SSPaQ, a subtractive method for the parallel quantification of the extent of modification at each possible site of a protein. The method combines uniform isotopic labeling and proteolysis with MS, followed by a segmentation approach, a powerful tool to refine the quantification of the degree of modification of a peptide to a segment containing a single modifiable amino acid. The strength of this strategy resides in: (1) quantification of all modifiable sites in a protein without prior knowledge of the type(s) of modified residues; (2) insensitivity to changes in the solubility and ionization efficiency of peptides upon modification; and (3) detection of missed cleavages caused by the modification for mitigation. The SSPaQ method was applied to quantify modifications resulting from the interaction of human phosphatidyl ethanolamine binding protein 1 (hPEBP1), a metastasis suppressor gene product, with locostatin, a covalent ligand and antimigratory compound with demonstrated activity towards hPEBP1. Locostatin is shown to react with several residues of the protein. SSPaQ can more generally be applied to induced modification in the context of drugs that covalently bind their target protein. With an alternate front-end protocol, it could also be applied to the quantification of protein PTMs, provided a removal tool is available for that PTM. Graphical Abstract ᅟ.
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Affiliation(s)
- Guillaume Gabant
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique, UPR 4301, rue Charles Sadron, 45071, Orléans cedex 2, France
- University of Orléans, Orléans, France
| | - Alain Boyer
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique, UPR 4301, rue Charles Sadron, 45071, Orléans cedex 2, France
| | - Martine Cadene
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique, UPR 4301, rue Charles Sadron, 45071, Orléans cedex 2, France.
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50
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Sheng J, Wang Y, Turesky RJ, Kluetzman K, Zhang QY, Ding X. Novel Transgenic Mouse Model for Studying Human Serum Albumin as a Biomarker of Carcinogenic Exposure. Chem Res Toxicol 2016; 29:797-809. [PMID: 27028147 DOI: 10.1021/acs.chemrestox.5b00529] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Albumin is a commonly used serum protein for studying human exposure to xenobiotic compounds, including therapeutics and environmental pollutants. Often, the reactivity of albumin with xenobiotic compounds is studied ex vivo with human albumin or plasma/serum samples. Some studies have characterized the reactivity of albumin with chemicals in rodent models; however, differences between the orthologous peptide sequences of human and rodent albumins can result in the formation of different types of chemical-protein adducts with different interaction sites or peptide sequences. Our goal is to generate a human albumin transgenic mouse model that can be used to establish human protein biomarkers of exposure to hazardous xenobiotics for human risk assessment via animal studies. We have developed a human albumin transgenic mouse model and characterized the genotype and phenotype of the transgenic mice. The presence of the human albumin gene in the genome of the model mouse was confirmed by genomic PCR analysis, whereas liver-specific expression of the transgenic human albumin mRNA was validated by RT-PCR analysis. Further immunoblot and mass spectrometry analyses indicated that the transgenic human albumin protein is a full-length, mature protein, which is less abundant than the endogenous mouse albumin that coexists in the serum of the transgenic mouse. The transgenic protein was able to form ex vivo adducts with a genotoxic metabolite of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine, a procarcinogenic heterocyclic aromatic amine formed in cooked meat. This novel human albumin transgenic mouse model will facilitate the development and validation of albumin-carcinogen adducts as biomarkers of xenobiotic exposure and/or toxicity in humans.
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Affiliation(s)
- Jonathan Sheng
- Wadsworth Center, New York State Department of Health , Albany, New York 12201, United States
| | - Yi Wang
- Masonic Cancer Center and Department of Medicinal Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Robert J Turesky
- Masonic Cancer Center and Department of Medicinal Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Kerri Kluetzman
- Wadsworth Center, New York State Department of Health , Albany, New York 12201, United States
| | - Qing-Yu Zhang
- Wadsworth Center, New York State Department of Health , Albany, New York 12201, United States
| | - Xinxin Ding
- College of Nanoscale Science, SUNY Polytechnic Institute , Albany, New York 12203, United States
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