Abstract：
:The present study was undertaken in an attempt to reconcile the seemingly conflicting observations that glutathione-dependent biotransformation of methyl parathion (O,O-dimethyl-O-(4-nitrophenyl)phosphorothionate) by hepatic supernatant or partially purified glutathione S-transferases occurs in vitro, but not to any significant degree in vivo in the mouse. While incubation of 20 microM methyl parathion with glutathione-fortified 100,000 x g hepatic supernatant resulted in biotransformation of this insecticide, addition of the carbon monoxide exposed microsomal fraction (without NADPH) to the supernatant abolished this metabolism. HPLC analyses of the distribution of methyl parathion between 100,000 x g supernatant and carbon monoxide-exposed microsomes revealed that little methyl parathion could be recovered in the 100,000 x g supernatant, and that the bulk of this insecticide was associated with the microsomal fraction. Increasing the concentration of methyl parathion to 1 mM resulted in a greater fraction of methyl parathion found in the supernatant compared to that with 20 microM, although the bulk of methyl parathion remained associated with the microsomal fraction. While this increase in the fraction of substrate located within the supernatant led to limited glutathione-dependent metabolism of methyl parathion, it must be emphasized that a liver concentration of 1 mM methyl parathion is far greater than that which could be achieved in vivo. In conclusion, the results of the present study support the hypothesis that in the mouse, glutathione-dependent metabolism of methyl parathion does not occur to a significant degree in vivo because of its limited access to the soluble glutathione S-transferases.
journal_name
Toxicol Lettjournal_title
Toxicology lettersauthors
Huang YS,Sultatos LGdoi
10.1016/0378-4274(93)90018-ssubject
Has Abstractpub_date
1993-06-01 00:00:00pages
275-84issue
3eissn
0378-4274issn
1879-3169pii
0378-4274(93)90018-Sjournal_volume
68pub_type
杂志文章abstract：:Fumonisin B1 (FB1) and beauvericin (BEA) are secondary metabolites of filamentous fungi, which under appropriate temperature and humidity conditions may develop on various foods and feeds. To date few studies have been performed to evaluate the toxicological and endocrine disrupting effects of FB1 and BEA. The present...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2016.05.021
更新日期：2016-08-22 00:00:00
abstract：:There is a trend towards increasing doses of pralidoxime to treat human organophosphate poisonings that may have relevance in subpopulations. Indeed, pralidoxime is eliminated unchanged by the renal route. This study assesses the effect of renal failure on the kinetics of pralidoxime in a rat model of acute renal fail...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2008.10.022
更新日期：2009-01-10 00:00:00
abstract：:Chemical-induced carcinogenesis has been in the focus of toxicological research for many decades. However, the mechanisms leading to tumor formation are only understood with certain substances. The intake of potential carcinogens by inhalation is a major route of exposure. Chemical-induced lung tumors are the final ma...
journal_title：Toxicology letters
pub_type： 杂志文章,评审
doi：10.1016/s0378-4274(99)00285-4
更新日期：2000-03-15 00:00:00
abstract：:It is known in humans and mouse models, that drinking water exposures to arsenite (As+3) leads to immunotoxicity. Previously, our group showed that certain types of immune cells are extremely sensitive to arsenic induced genotoxicity. In order to see if cells from different immune organs have differential sensitivitie...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2016.09.008
更新日期：2016-11-16 00:00:00
abstract：:Effects of intestinal damage on thyroid carcinogenesis due to amitrole (AT) were examined in F344 male rats initiated with N-bis(2-hydroxypropyl)nitrosamine (DHPN). In experiment 1, rats were provided with diet containing 0.03% AT for 20 weeks after a single subcutaneous injection of DHPN (2800 mg/kg body weight), and...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2005.11.012
更新日期：2006-06-20 00:00:00
abstract：:The utility of HepaRG cells as an in vitro cell-based assay system for assessing drug-induced liver injury (DILI) risk was investigated. Seventeen DILI-positive and 15 DILI-negative drugs were selected for the assay. HepaRG cells were treated with each drug for 24h at concentrations that were 1.6-, 6.3-, 25-, and 100-...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2015.04.014
更新日期：2015-07-02 00:00:00
abstract：:Lead is a toxic heavy metal with many recognized adverse health side effects. The central nervous system is the main target of lead toxicity. Although many studies on lead toxicity were conducted, the mechanism of lead toxicity remains uncertain. One possible attribution is the immature blood-brain barrier that causes...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2014.03.009
更新日期：2014-06-16 00:00:00
abstract：:The influence of cold exposure (+ 1 degree C for 24 h) was studied in rats dosed i.p. with 0, 2.5 or 5.0 mumol HgCl2/kg. Cold exposure of controls caused an increased diuresis and solute elimination, except sodium, with almost no variations in urine alkaline phosphatase (ALP) and gammaglutamyl transferase (GGT). Proxi...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(82)90067-4
更新日期：1982-02-01 00:00:00
abstract：:Dichloroacetic acid (DCA) is a complete hepatocarcinogen and tumor promoter in the male B6C3F1 mouse. Published reports indicate that the compound is non-genotoxic. This study examines possible non-genotoxic (epigenetic) mechanisms by which DCA elicits its carcinogenic response. Correlative biochemical, pathologic and...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(95)03409-9
更新日期：1995-11-01 00:00:00
abstract：:Although high or repeated exposure to different forms of Hg can have serious health consequences, the most important toxicity risk for humans is as methylmercury (MeHg) which exposure is mainly through consumption of fish. Generally, more than the 80% of Hg in hair is as MeHg, which is taken up by hair follicles as Me...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2018.06.1215
更新日期：2018-12-01 00:00:00
abstract：:The Pseudonaja genus (Brown snakes) is widely distributed across Australia and bites account for significant mortality. Venom-induced consumption coagulopathy (VICC) and, less often, early cardiovascular collapse occur following envenoming by these snakes. We have previously examined possible mechanism(s) behind the e...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2013.06.235
更新日期：2013-08-29 00:00:00
abstract：:Mechanisms of zinc (Zn) toxicity are incompletely understood and data regarding potential endocrine alterations in Zn toxicity are scarce. To examine mechanisms of Zn toxicity, day-old chicks were pair-fed diets containing 5280 ppm (Hz) or 73 ppm (CON) Zn. Impaired postnatal growth, independent of feed consumption, an...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(91)90205-k
更新日期：1991-08-01 00:00:00
abstract：:Single doses of primaquine did not produce methemoglobinemia in beagle bitches. Repeated daily administration for 12 days produced a gradually rising level of methemoglobin over that time period, unaccompanied by depletion of erythrocytic reduced glutathione. Primaquine was mutagenic in the Ames test in Salmonella typ...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(87)90197-4
更新日期：1987-05-01 00:00:00
abstract：:Chronic exposure to arsenic increases the risk of developing a variety of human cancers including lung carcinomas. However, the exact molecular mechanism underlying arsenic carcinogenicity remains largely unknown. Autophagy is a conserved catabolic process for maintaining cellular protein homeostasis whose defects mig...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2020.06.006
更新日期：2020-10-10 00:00:00
abstract：:In the olfactory epithelium the primary olfactory neurons are in contact with the environment in the nasal cavity and they are also connected to the olfactory bulbs of the brain. These neurons may therefore provide a pathway by which foreign materials may reach the brain. Inhalation of cobalt-containing dust or fumes ...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/s0378-4274(03)00266-2
更新日期：2003-11-01 00:00:00
abstract：:The relative toxicity of three legacy and six emerging brominated flame retardants* was studied in the male Harlan Sprague Dawley rat. The hepatocellular and thyroid toxicity of each flame retardant was evaluated following five-day exposure to each of the nine flame retardants (oral gavage in corn oil) at 0.1-1000 μmo...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2020.07.016
更新日期：2020-10-10 00:00:00
abstract：:PFAS are man-made compounds that are highly spread in the environment. Human dietary exposure to such contaminants is of high concern as they may accumulate in the food chain. Different studies already demonstrated the importance of the fish consumption in the dietary exposure of these molecules and the potential incr...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2014.07.028
更新日期：2014-12-01 00:00:00
abstract：:Toxic industrial chemicals are used throughout the world to produce everyday products such as household and commercial cleaners, disinfectants, pesticides, pharmaceuticals, plastics, paper, and fertilizers. These chemicals are produced, stored, and transported in large quantities, which poses a threat to the local civ...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2015.10.010
更新日期：2016-02-26 00:00:00
abstract：:This study aimed to evaluate bio-safety of magnetic chitosan nanogels as dual triggered drug carrier for doxorubicin through analysis of mitochondrial function. In the present study, chitosan/TPP nanogels containing magnetite nanoparticles (NPs) were prepared according to the ionotropic gelation method as novel pH-sen...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2017.06.004
更新日期：2017-08-15 00:00:00
abstract：:Rats (Fisher, Wistar, Donryu and Sprague-Dawley strains) were exposed to 5 approximately 3500 ppm toluene for 8 h, and urine samples were analyzed for hippuric acid and cresols. While hippuric acid increased in proportion to the exposure concentration, a sharp increase in o-cresol excretion was observed at high toluen...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(84)90134-6
更新日期：1984-11-01 00:00:00
abstract：:Cytotoxicity in terms of haemolytic potency in vitro of eight surfactants failed to correlate with in vivo rabbit eye irritancy. Ability of the same surfactants to block spontaneous contractions of mouse and rabbit isolated ileum (especially the latter), correlated better with in vivo findings in rabbit eyes. Effectiv...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(83)90062-0
更新日期：1983-08-01 00:00:00
abstract：:Nano-materials are currently being used in a variety of fields. One of the concerns associated with their use is their potential to harm human health. In an attempt to identify genes expressed differently in human lung cells (WI-26 VA4) exposed to nanosized (45 nm in diameter) PAMAM (polyamidoamine) dendrimers, we obs...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2009.07.018
更新日期：2009-10-28 00:00:00
abstract：:Cisplatin, a widely used chemotherapeutic drug, causes ototoxicity in a large percentage of patients. The purpose of this study was to determine the efficacy of epicatechin (EC) as an otoprotective agent to prevent cisplatin toxicity and to investigate the molecular mechanism of EC. The effects of EC on cisplatin-indu...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2010.09.013
更新日期：2010-12-15 00:00:00
abstract：:The oral LD50 of hymenoxon in Swiss white mice was found to be 241 +/- 37 mg/kg. No significant sex differences were observed. Pretreatment of male mice for 3 days using doses of 50 and 100 mg/kg hymenoxon failed to alter significantly pentobarbital sleeping time. Hymenoxon was found to be a direct-acting mutagen in t...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(81)90016-3
更新日期：1981-12-01 00:00:00
abstract：:The effects of 3 weeks' or 6 months' inhalation exposure of rats to aromatic white spirit 6 h/day, 5 days/week at 0, 400, or 800 ppm were studied. Synaptosomal neurochemistry was investigated as index of the in situ conditions in the presynaptic nerve terminal. In both studies, the relative and absolute yield of synap...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(95)03325-f
更新日期：1995-10-01 00:00:00
abstract：:The data obtained from in vitro systems utilizing human cells and tissues should form a basic part of the information necessary for risk assessment. The most important thing for such systems is, therefore, to simulate the structures and functions of cells and tissues in the native organ as closely as possible. In desi...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(96)03721-6
更新日期：1996-11-01 00:00:00
abstract：:Citrinin (CIT), a fungal metabolite causing nephrotoxicity, has a tolerable daily intake (TDI) value of 0.2μg/kg bw. Contamination of food with CIT is not sufficiently known to allow dietary exposure assessment. Urinary biomonitoring data are available from cohorts of several countries. However, kinetic information is...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2017.10.006
更新日期：2018-01-05 00:00:00
abstract：:The distribution and acute lethality of i.v. administered 3 micrometers latex spheres were determined in rats. The results extend previous studies demonstrating the similarity between dog and rat in the dynamics of microspheres in these species and the inverse relationship between sphere diameter and hemodynamic toxic...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/0378-4274(81)90035-7
更新日期：1981-10-01 00:00:00
abstract：:Sulphur mustard (SM) is a blistering agent that causes debilitating damage to the skin, eyes and respiratory system. In cases of severe exposure, immunodepletion can occur as well as death, due to secondary infections. The toxicity of SM is thought to be mediated in part by the alkylation of nucleic acids and proteins...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2011.11.009
更新日期：2012-02-25 00:00:00
abstract：:Fatty acid composition was studied in milk at day 14 and in liver at day 24 after parturition of lactating rats exposed to 0 ppm, 5 ppm or 25 ppm cadmium (Cd) via drinking water for 17 days during lactation, and in the brain of their offspring at day 19 after birth. In the liver phospholipid fraction, 22:5(n-3) was si...
journal_title：Toxicology letters
pub_type： 杂志文章
doi：10.1016/j.toxlet.2003.12.012
更新日期：2004-03-14 00:00:00
