Abstract:
:To examine the demethylation reaction of methylmercury (MeHg) in rat liver, slices prepared from MeHg-treated rats were incubated in L-15 medium under 95% O2/5% CO2 atmosphere. During the incubation, the amount of inorganic Hg in the slices markedly increased in a time-dependent manner, although the concentration of total Hg remained unchanged. Since the C-Hg bond in MeHg was demonstrated to be cleaved by the action of some reactive oxygen species, the effects on MeHg demethylation of several reagents that could modify reactive oxygen production were examined in the present system. Methylviologen was found to be an effective enhancer of the demethylation reaction with only a minor effect on lipid peroxidation. On the other hand, ferrous ion added to the medium showed no effect on demethylation in the presence or absence of methylviologen, although lipid peroxide levels were increased significantly by ferrous ion. Similarly, deferoxamine mesylate, which effectively suppressed the increase in lipid peroxide levels, also had no effect on demethylation. Furthermore, hydroxy radical scavengers, such as mannitol and dimethylsulfoxide, had no effect on inorganic Hg production. Rotenone, an inhibitor of complex I in the mitochondrial electron transport system, increased levels of both inorganic Hg and lipid peroxide. However, other inhibitors, such as antimycin A, myxothiazole and NaCN, significantly suppressed the demethylation reaction. Cell fractionation of the MeHg-treated rat liver revealed that the ratio of inorganic Hg to total Hg was highest in the mitochondrial fraction. Furthermore, superoxide anion could degrade MeHg in an organic solvent but not in water. These results suggested that the demethylation of MeHg by the liver slice would proceed with the aid of superoxide anion produced in the electron transfer system at the hydrophobic mitochondrial inner membrane. Furthermore, the involvement of hydroxy radicals, which have been demonstrated to be effective in cleaving the C-Hg bond in the aqueous media, might be minimal. Here, we also demonstrated that liver slices are a useful experimental model for mimicking the MeHg biotransformation reaction.
journal_name
Arch Toxicoljournal_title
Archives of toxicologyauthors
Yasutake A,Hirayama Kdoi
10.1007/s002040100256keywords:
subject
Has Abstractpub_date
2001-09-01 00:00:00pages
400-6issue
7eissn
0340-5761issn
1432-0738journal_volume
75pub_type
杂志文章abstract::Mercury exists in the environment in various forms, all of which pose a risk to human health. Despite guidelines regulating the industrial release of mercury into the environment, humans continue to be exposed regularly to various forms of this metal via inhalation or ingestion. Following exposure, mercuric ions are t...
journal_title:Archives of toxicology
pub_type: 杂志文章,评审
doi:10.1007/s00204-016-1803-y
更新日期:2017-01-01 00:00:00
abstract::The effects of small repeated oral doses of mono-2-cresyl diphenyl phosphate (MOCP, 2.5 mg/kg/day) on hen brain and spinal cord neurotoxic esterase (NTE) were measured. The enzyme levels were depressed to about 40% and 55% of normal respectively and maintained at that level for 8 weeks. No clinical and only doubtful h...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00293807
更新日期:1980-10-01 00:00:00
abstract::Neutrophils infiltrate tissues during inflammation, and when activated, they release β-glucuronidase. Since inflammation is associated with carcinogenesis, we investigated how extracellular β-glucuronidase changed the in vitro cellular response to the chemical carcinogen benzo(a)pyrene (B[a]P). For this we exposed hum...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-015-1593-7
更新日期:2016-09-01 00:00:00
abstract::Bisphenol A (BPA) is a chemical in widespread use that is under scientific discussion due to its endocrine activity. Controversies exist about how to interpret reportedly high blood concentrations measured in uncontrolled situations. Physiologically based pharmaco-/toxicokinetic modelling resulted in 10-100-fold lower...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-013-1022-8
更新日期:2013-07-01 00:00:00
abstract::Tributyltin (TBT) has been shown to disrupt the ability of natural killer (NK) cells to destroy tumor targets in vitro even at exposures of 25 nM for 24 h, but cell viability was not significantly impacted. Thus, evaluation of intracellular molecular events that regulate cell viability in TBT exposed NK cells are of i...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-006-0155-4
更新日期:2007-04-01 00:00:00
abstract::Exposure to bisphenolic chemicals during pregnancy occurs in > 90% of pregnancies. Bisphenolic compounds can cross the placental barrier reaching fetal circulation. However, the effects of emerging bisphenolic compounds, such as bisphenol S (BPS), on placental function remain untested. The aim was to determine if bisp...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-018-2191-2
更新日期:2018-05-01 00:00:00
abstract::Several aromatic amines (AAs) are known to be carcinogens for humans. AAs are considered to be substantially absorbed through the skin. However, the database for dermal absorption of AAs in general is limited and no specific studies on dermal absorption of beta-naphthylamine (BNA) and o-toluidine (OT) have been publis...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-006-0095-z
更新日期:2006-10-01 00:00:00
abstract::The mycotoxin deoxynivalenol (DON) has a high global prevalence in grain-based products. Biomarkers of exposure are detectable in most humans and farm animals. Considering the acute emetic and chronic anorexigenic toxicity of DON, maximum levels for food and feed have been implemented by food authorities. The tolerabl...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-019-02470-1
更新日期:2019-07-01 00:00:00
abstract::The development of non-animal methodology to evaluate the potential for a chemical to cause systemic toxicity is one of the grand challenges of modern science. The European research programme SEURAT is active in this field and will conclude its first phase, SEURAT-1, in December 2015. Drawing on the experience gained ...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-014-1421-5
更新日期:2015-01-01 00:00:00
abstract::Menadione is a naphthoquinone used as a vitamin K source in animal feed that can generate reactive oxygen species (ROS) and cause apoptosis. Here, we examined whether menadione reduces development of preimplantation bovine embryos in a ROS-dependent process and tested the hypothesis that actions of menadione would be ...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-009-0458-3
更新日期:2009-11-01 00:00:00
abstract::The effects of cadmium exposure during pregnancy (by means of daily subcutaneous injections of 4.4 mumol/kg to the mother) on the neonates were investigated. No effect was observed on fetal or neonatal body weights, nor on neonatal liver weights. These parameters were examined up to 5 weeks after birth. The weight of ...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00334632
更新日期:1989-01-01 00:00:00
abstract::For ethical and regulatory reasons, in vitro tests for scoring potential toxicities of cosmetics are essential. A test strategy for investigating potential skin sensitization using two human keratinocytic and two human dendritic cell lines has been developed (Mehling et al. Arch Toxicol 86:1273–1295, 2012). Since proh...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-013-1090-9
更新日期:2013-09-01 00:00:00
abstract::Mycotoxins are the most frequently occurring natural contaminants in human and animal diet. Among them, deoxynivalenol (DON), produced by Fusarium, is one of the most prevalent and thus represents an important health risk. Recent detection methods revealed new mycotoxins and new molecules derivated from the "native" m...
journal_title:Archives of toxicology
pub_type: 杂志文章,评审
doi:10.1007/s00204-016-1826-4
更新日期:2016-12-01 00:00:00
abstract::Rat embryos (9.5-day-old) were cultured for 48 h in the presence of nifedipine (NIF), nimodipine (NIM), nitrendipine (NIT), gallopamil HCl (GAL), verapamil HCl (VER) and diltiazem HCl (DIL). The effects on growth and morphogenetic differentiation in vitro were monitored. Dose-response relationships were evaluated, inc...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF01974690
更新日期:1990-01-01 00:00:00
abstract::The pregnancy outcomes of 109 women who were intoxicated during pregnancy due to excessive amounts of drugs and other agents were studied. Seventy per cent of the women attempted suicide, and the intoxication in 78% of all cases was caused by drugs. The stillbirth rate (4%) was higher than that in previous and subsequ...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00316249
更新日期:1988-08-01 00:00:00
abstract::Previous rat toxicity studies of alpha-glycosyl isoquercitrin (AGIQ), a water-soluble flavonol glycoside derived from rutin, revealed systemic yellow bone discoloration. This investigative study was conducted to determine the AGIQ metabolite(s) responsible for the discoloration. Female Sprague-Dawley rats were adminis...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-020-02760-z
更新日期:2020-07-01 00:00:00
abstract::Aluminum phosphide (AlP), one of the most commonly used pesticides worldwide, has been the leading cause of self-poisoning mortalities among many Asian countries. The heart is the main organ affected in AlP poisoning. Melatonin has been previously shown to be beneficial in reversing toxic changes in the heart. The pre...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-017-1998-6
更新日期:2017-09-01 00:00:00
abstract::The effect of intracerebroventricular (i.c.v.) administration of cadmium or magnesium on central calcium-dependent blood pressure regulation was investigated. The systolic blood pressure of spontaneously hypertensive rats (SHR; male, 13 weeks of age) decreased following i.c.v. administration of cadmium chloride (20 nm...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s002040050644
更新日期:2000-03-01 00:00:00
abstract::Intravenous administration of lead acetate to rabbits for 10 weeks at 2 week intervals resulted in significantly elevated blood lead levels, slight anemia with marked microspherocytosis and moderate basophilic stippling, and marked depression of red cell delta-aminolevulinic acid (ALA) dehydratase activity. However th...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00695874
更新日期:1979-10-01 00:00:00
abstract::Liver microsomes were prepared from Wistar rat by the Ca2+ aggregation method. Under various conditions, ethyl mercury chloride (EtHgCl) or methyl mercury chloride (MeHgCl) was incubated with the microsomal preparations. After the incubation, the amounts of inorganic Hg and hydroxyl radical (.OH) in the preparations w...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF02035129
更新日期:1992-01-01 00:00:00
abstract::Organophosphate-induced delayed polyneuropathy (OPIDP) is initiated by inhibition/aging of more than 70-75% of neuropathy target esterase (NTE). Di-n-butyl-2,2-dichlorovinyl phosphate (DBDCVP) (1 mg/kg s.c.) inhibited 96%, 86% and 83% of NTE in brain, spinal cord and peripheral nerve, respectively, and induced a typic...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00316450
更新日期:1989-01-01 00:00:00
abstract::The effect of N-benzyl-D-glucamine dithiocarbamate (BGD) on the renal toxicity induced by acute exposure to cadmium-metallothionein (Cd-MT) in rats was studied. Rats were injected intraperitoneally with BGD (400 mumol/kg) 6, 12, or 24 h after intraperitoneal injection of Cd-MT (1.78 mumol Cd as Cd-MT/kg) and thereafte...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF01974392
更新日期:1990-01-01 00:00:00
abstract::Fumonisin B1 (FB1) is a well-known inhibitor of de novo sphingolipid biosynthesis, due to its ability to inhibit ceramide synthases (CerS) activity. In mammals, this toxin triggers broad clinical symptoms with multi-organ dysfunction such as hepatotoxicity or pulmonary edema. The molecular mechanism of CerS inhibition...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-014-1323-6
更新日期:2015-09-01 00:00:00
abstract::Occupational exposure to benzene has been associated with leukemia, anemia, leukopenia, and thrombocytopenia. Genetic susceptibility to benzene toxicity in humans may be related to variations in benzene metabolizing genes. The main objective of this study was to ascertain whether polymorphism of GSTP1, GSTM1, GSTT1 an...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-017-2104-9
更新日期:2018-06-01 00:00:00
abstract::The development and application of high throughput in vitro assays is an important development for risk assessment in the twenty-first century. However, there are still significant challenges to incorporate in vitro assays into routine toxicity testing practices. In this paper, a robust learning approach was developed...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-018-2260-6
更新日期:2018-09-01 00:00:00
abstract::Changes in the urinary excretion of hippuric acid (HIA) and phenaceturic acid (PUA) as well as their metabolic precursors, i.e. benzoic (BA) and phenylacetic acid (PAA), in rats housed in glass metabolic cages for 4 days were monitored using gas-liquid chromatography. The amount of HIA excreted was 128 +/- 63 mumol/kg...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF00324554
更新日期:1987-01-01 00:00:00
abstract::This study was conducted to determine the functional role of phospholipase D (PLD) involved in testicular Leydig cell damage caused by di (2-ethylhexyl) phthalate (DEHP) in Sprague-Dawley rats. DEHP (500 mg/kg/day) was administered orally to prepubertal rats for 1, 7, 14, 21 or 28 days. After 7 days of exposure, DEHP ...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s00204-010-0618-5
更新日期:2011-08-01 00:00:00
abstract::Retinoids, derivatives of vitamin A, are essential for many vertebrate functions. Furthermore, several drugs of this class of compounds are valuable in the treatment of certain forms of skin disorders and cancer. However, the therapeutic application of retinoids is limited by their teratogenic potency. The limbs are i...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/s002040050368
更新日期:1997-01-01 00:00:00
abstract::The covalent binding of 14C-1,1,2-trichloroethylene (14C-TRI) metabolites to calf thymus DNA in vitro and to RNA and DNA of mouse brain, lung, liver, kidney, spleen, pancreas, and testis after repeated i.p. injections has been studied. Hydrolysates of DNA reacted with 14C-TRI in vitro and hydrolysates of RNA and DNA f...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF01239202
更新日期:1983-11-01 00:00:00
abstract::Carbon tetrachloride (CCl4) caused a dose-dependent increase in urinary taurine which correlated with both the histological and biochemical assessment of liver damage. The peak elevation in urinary taurine occurred within the first 48 h after dosing but there was still significant taurinuria 72 and 96 h after the inte...
journal_title:Archives of toxicology
pub_type: 杂志文章
doi:10.1007/BF01973715
更新日期:1991-01-01 00:00:00