Abstract:
:An increased risk of breast cancer has been observed in women who consume "very well-done" meats. Heterocyclic amines are mutagenic and carcinogenic pyrolysis products formed during high temperature cooking of meats. In the present study, human milk samples were analyzed for PhIP, one of the most abundant dietary heterocyclic amine. A protocol was developed with a mixed-mode cation exchange sorbent for the extraction of heterocyclic amines from milk. Milk samples were acquired from healthy Canadian women. With LC/MS analysis and the method of isotope dilution for quantification, levels of PhIP were determined in human milk samples. PhIP was detected in 9 of the 11 milk samples, at levels as high as 59 pg/mL (ppt). No PhIP was detected in the milk of the vegetarian donor. Detection of PhIP in milk indicates that ductal mammary epithelial cells are directly exposed to this carcinogen, suggesting that heterocyclic amines are possible human mammary carcinogens.
journal_name
Chem Res Toxicoljournal_title
Chemical research in toxicologyauthors
DeBruin LS,Martos PA,Josephy PDdoi
10.1021/tx015556usubject
Has Abstractpub_date
2001-11-01 00:00:00pages
1523-8issue
11eissn
0893-228Xissn
1520-5010pii
tx015556ujournal_volume
14pub_type
杂志文章abstract::Exposure to aristolochic acid I (AAI) is associated with aristolochic acid nephropathy, Balkan endemic nephropathy, and urothelial cancer. Individual differences in xenobiotic-metabolizing enzyme activities are likely to be a reason for interindividual susceptibility to AA-induced disease. We evaluated the reductive a...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx200259y
更新日期:2011-10-17 00:00:00
abstract::Liver microsomes from uninduced hogs catalyzed the NADPH-dependent N-oxidation of the hydroxylamine (Z)-3-(4-bromophenyl)-N-hydroxy-N-methyl-3-(3-pyridyl)allylamine. The conjugated nitrone N-[(2Z)-3-(4-bromophenyl)-3-(3-pyridyl)-2-propenylidene]methylamin e N-oxide was the principal product and accounted for 90-95% of...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx00017a007
更新日期:1990-09-01 00:00:00
abstract::Today much is known about cytochrome P450 (P450) enzymes and their catalytic specificity, but the range of reactions catalyzed by each still continues to surprise. Historically, P450s had been considered to be involved in either the metabolism of xenobiotics or endogenous chemicals, in the former case playing a genera...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/acs.chemrestox.6b00226
更新日期:2017-01-17 00:00:00
abstract::Alzheimer's disease, the most common cause of dementia, is at epidemic proportions (15 to 44% depending on age, of those age 65 to 84) in the U.S. and other developed countries but remains relatively rare in undeveloped countries. Surprisingly, solid historical data reveal the epidemic is a creature of the last centur...
journal_title:Chemical research in toxicology
pub_type: 杂志文章,评审
doi:10.1021/acs.chemrestox.6b00373
更新日期:2017-03-20 00:00:00
abstract::The hepatic metabolism of microcystins (MCs), potent cyclic peptide hepatotoxins produced by cyanobacteria, was studied by i.p. injection in mice and rats. An immunoaffinity purification method using an anti-MC-LR monoclonal antibody showed a remarkable effect on the removal of contaminants in the hepatic cytosol and ...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx960085a
更新日期:1996-12-01 00:00:00
abstract::Drug-induced myocardial infarction (DIMI) is one of the most serious adverse drug effects that often lead to death. Therefore, the identification of DIMI at the early stages of drug development is essential. For this purpose, the in vitro testing and in silico prediction of interactions between drug-like substances an...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx500147d
更新日期:2014-07-21 00:00:00
abstract::The bifunctional alkylating agent, melphalan, forms adducts on DNA that are recognized by two previously described monoclonal antibodies, MP5/73 and Amp4/42. Immunoreactivity to MP5/73 was lost when alkylated DNA was exposed to alkaline pH, while Amp4/42 only recognized the structures formed after the alkali treatment...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx000178z
更新日期:2001-01-01 00:00:00
abstract::Thioredoxin reductase (TR), an NADPH-dependent flavoenzyme that catalyzes the reduction of many disulfide-containing substrates, plays an important role in the cellular response to oxidative stress. Trivalent arsenicals, especially methyl As that contains trivalent arsenic (MAs(III)), are potent noncompetitive inhibit...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx0001878
更新日期:2001-03-01 00:00:00
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journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx000235o
更新日期:2001-07-01 00:00:00
abstract::N-Methyl-N-nitrosourea (MNU) is a reactive, mutagenic methylating agent. MNU methylates DNA at various sites, including guanine N7, guanine O6, and adenine N3. Dixit and Gold [(1986) Proc. Natl. Acad. Sci. U.S.A. 83, 8039-8043] reported that ellagic acid, a phenolic natural product, inhibited the mutagenicity of MNU i...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
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更新日期:1990-05-01 00:00:00
abstract::Toxicological studies assessing the safety of compounds for humans frequently use in vitro systems to characterize toxic responses in combination with transcriptomic analyses. Thus far, changes have mostly been investigated at the mRNA level. Recently, microRNAs have attracted attention because they are powerful negat...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx2003799
更新日期:2012-04-16 00:00:00
abstract::Exposure assessment in in vitro cell-based bioassays is challenging for ionizable organic chemicals (IOCs), because they are present as more than one chemical species in the bioassay medium. Furthermore, compared to neutral organic chemicals, their binding to medium proteins and lipids is driven by more complex molecu...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/acs.chemrestox.0c00067
更新日期:2020-07-20 00:00:00
abstract::The clinically used antitumor antibiotic mitomycin C requires a reductive activation to be converted to a bis-electrophile that forms several covalent adducts with DNA, including an interstrand cross-link which is considered to be the lesion responsible for the cytotoxic effects of the drug. Enzymes such as cytochrome...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx9002758
更新日期:2009-10-01 00:00:00
abstract::The effect of adduct stereochemistry on the susceptibility to hydrolysis by snake venom (VPD) and bovine spleen (SPD) phosphodiesterases was investigated with short deoxyoligonucleotides containing defined adducts derived from alkylation of the exocyclic 6-amino group of dA by polycyclic aromatic hydrocarbon diol epox...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx010092l
更新日期:2001-09-01 00:00:00
abstract::DNA molecules utilize adenine, thymine, cytosine, and guanine for coding genetic information. In addition to these four canonical nucleobases, DNA molecules also contain a variety of modified nucleobases that can control and regulate gene expression and chromosome structure. Elucidating the functions of DNA modificati...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/acs.chemrestox.9b00372
更新日期:2020-03-16 00:00:00
abstract::The conjugation of reactive drug metabolites to GSH is considered an important detoxification mechanism that can be spontaneous and/or mediated by glutathione S-transferases (GSTs). In case GSTs play an important role in GSH conjugation, genetically determined deficiencies in GSTs may be a risk factor for adverse drug...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx100131f
更新日期:2010-09-20 00:00:00
abstract::It is well-known that aromatic diamino-, dihydroxy-, and amino-hydroxy compounds, with NH(2) and OH groups in ortho- or para-positions relative to each other, are strong skin sensitizers. In this paper, we analyze published potency and cross-reactivity data, whereby animals sensitized to one of these compounds are cha...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx9000336
更新日期:2009-09-01 00:00:00
abstract::The relation between organophosphorus-induced delayed neuropathy (OPIDN) and brain neuropathy target esterase (NTE) inhibition is further examined in hens by structure-activity studies leading to the most potent in vitro NTE inhibitors known, which are then examined for their neuropathic effects in vivo in hens. The p...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx00050a011
更新日期:1995-12-01 00:00:00
abstract::Aryl radicals can react at the C8-site of 2'-deoxyguanosine (dG) to produce DNA adducts with a C8-C linkage (denoted C-linked). Such adducts are structurally distinct from those possessing a flexible amine (N-linked) or ether (O-linked) linkage, which separates the C8-aryl moiety from the guanine nucleobase. In the cu...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/acs.chemrestox.5b00233
更新日期:2015-08-17 00:00:00
abstract::In this study, human glutathione transferases (GSTs) of alpha class have been assayed with the ultimate carcinogenic (-)-anti- and (+)-syn-diol epoxides (DEs) derived from the nonplanar dibenzo[a,l]pyrene (DBPDE) and the (+)-anti-diol epoxide of the planar benzo[a]pyrene [(+)-anti-BPDE] in the presence of glutathione ...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx025519i
更新日期:2002-06-01 00:00:00
abstract::Previous work has shown that 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) causes porphyria, enhanced by iron, in C57BL/6J mice with marked accumulation in the liver of uroporphyrin I and III isomers and heptacarboxylic acid III and is one model of human porphyria cutanea tarda. Preliminary examination by HPLC also indic...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
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更新日期:2006-12-01 00:00:00
abstract::The metabolism of 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx) was investigated in five human volunteers given a dietary equivalent of 14C-labeled MeIQx. The amount of the dose excreted in urine ranged from 20.2% to 58.6%, with unmetabolized MeIQx accounting for 0.7-2.8% of the dose. Five principal metabolite...
journal_title:Chemical research in toxicology
pub_type: 临床试验,杂志文章
doi:10.1021/tx9701891
更新日期:1998-03-01 00:00:00
abstract::The present study describes a novel integrated approach for rapid analysis of reactive metabolites with a linear ion trap mass spectrometer (LTQ). In this approach, an isotope pattern-dependent scanning method was applied to the data acquisition of glutathione (GSH)-trapped reactive metabolites. Recorded full-scan MS ...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx8001115
更新日期:2008-07-01 00:00:00
abstract::Chemical and structural alterations to lysozyme (LYSO), glucose 6-phosphate dehydrogenase (G6PD), and bovine eye lens proteins (BLP) promoted by peroxyl radicals generated by the thermal decomposition of 2,2'-azobis(2-amidinopropane) hydrochloride (AAPH) under aerobic conditions were investigated. SDS-PAGE analysis of...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx300372t
更新日期:2013-01-18 00:00:00
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journal_title:Chemical research in toxicology
pub_type: 杂志文章,评审
doi:10.1021/tx200206v
更新日期:2011-11-21 00:00:00
abstract::The growth-promoting effects of estrogens in hormone-dependent tumor tissues involve receptor-mediated pathways that are well-recognized; however, the role of estrogens in tumor initiation remains controversial. Estrogen metabolites, primarily the catechol estrogens (CE's), have been implicated in tumor initiation via...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx980128i
更新日期:1999-03-01 00:00:00
abstract::The diarrhetic shellfish toxin composition in the digestive glands of mussels from the northern Adriatic sea was investigated. Along with known yessotoxins, identified by comparison of their chromatographic and spectral properties with those reported in the literature, we isolated a new analogue of yessotoxin, 42,43,4...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx000259v
更新日期:2001-05-01 00:00:00
abstract::Oxidative stress is a commonly cited mechanism of toxicity of environmental agents. Ubiquitous environmental chemicals such as the diesel exhaust component 1,2-naphthoquinone (1,2-NQ) induce oxidative stress by redox cycling, which generates hydrogen peroxide (H2O2). Cysteinyl thiolate residues on regulatory proteins ...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/acs.chemrestox.5b00424
更新日期:2015-12-21 00:00:00
abstract::The two diastereomeric forms (5'S) and (5'R) of 5',8-cyclo-2'-deoxyguanosine have been synthesized and fully characterized. They have been used as references for the investigation of gamma-irradiation of 2'-deoxyguanosine and photolysis of 8-bromo-2'-deoxyguanosine in aqueous solutions. The observed (5'R)/(5'S) ratio ...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx700282x
更新日期:2007-12-01 00:00:00
abstract::The current study examined the bioactivation potential of a nonpeptidyl thrombopoietin receptor agonist, 1-(3-chloro-5-((4-(4-fluoro-3-(trifluoromethyl)phenyl)thiazol-2-yl)carbamoyl)pyridine-2-yl)piperidine-4-carboxylic acid (1), containing a 2-carboxamido-4-arylthiazole moiety in the core structure. Toxicological ris...
journal_title:Chemical research in toxicology
pub_type: 杂志文章
doi:10.1021/tx700270r
更新日期:2007-12-01 00:00:00