Histopathologic lens changes in mirex-exposed rats.

abstract：:Activity of telomerase, the enzyme that synthesizes the telomere ends of linear eukaryotic chromosomes, is repressed in most normal human somatic cells but induced in most human cancers. Normal human cells that lack telomerase activity progressively lose telomere sequences. In contrast, most immortalized cell lines an...

journal_title：Toxicology letters

authors： Meyerson M

更新日期：1998-12-28 00:00:00

abstract：:Risk assessment of xenobiotics is a qualitative and quantitative assessment of toxic properties conventionally based on data resulting from tests in animals exposed to the substance. The assessment of dose-effect relationship includes evaluation of exposure at the site of action. More recently, emphasis is put on unde...

journal_title：Toxicology letters

authors： Heinrich-Hirsch B,Madle S,Oberemm A,Gundert-Remy U

更新日期：2001-03-31 00:00:00

abstract：:O,O,S-Trimethylphosphorothioate (OOS-Me) and O,S,S-trimethylphosphorodithioate (OSS-Me) are impurities in technical grade malathion and related insecticides which have been shown to cause delayed death in rats following a single oral dose of 40-60 mg/kg. In connection with studies on the mode of action of these compou...

journal_title：Toxicology letters

authors： Keadtisuke S,Dheranetra W,Fukuto TR

更新日期：1989-04-01 00:00:00

abstract：:Colon cancer evolves from a progressive inhibition of apoptosis and is influenced strongly by diet. Among dietary factors, butyrate (derived from fermentable fibers) may have utility as a chemopreventive agent because of its ability to promote apoptosis. Because CD95 (APO-1/Fas) transduces signals resulting in apoptos...

journal_title：Toxicology letters

authors： Chapkin RS,Fan Y,Lupton JR

更新日期：2000-03-15 00:00:00

abstract：:P-glycoprotein (Pgp) participates in the export of numerous toxins, drugs, and physiological compounds. To examine the involvement of Pgp in smoke-induced oral cell insult, the effects of extracts of the mainstream tobacco smoke (TS) on Pgp were studied in an oral epidermal carcinoma cell line, OECM-1. TS was first ex...

journal_title：Toxicology letters

authors： Pan WC,Chen RM,Shen YC,Chen CC,Ueng YF

更新日期：2009-03-10 00:00:00

abstract：:Metal oxide NPs are abundantly produced in nanotech industries and are emitted in several combustion processes, suggesting the need to characterize their toxic impact on the human respiratory system. The acute toxicity and the morphological changes induced by copper oxide and titanium dioxide NPs (nCuO and nTiO₂) on t...

journal_title：Toxicology letters

authors： Moschini E,Gualtieri M,Colombo M,Fascio U,Camatini M,Mantecca P

更新日期：2013-10-24 00:00:00

abstract：:The development of three generic multi-compartment physiologically based kinetic (PBK) models is described for farm animal species, i.e. cattle, sheep, and swine. The PBK models allow one to quantitatively link external dose and internal dose for risk assessment of chemicals relevant to food and feed safety. Model per...

journal_title：Toxicology letters

authors： Lautz LS,Hoeks S,Oldenkamp R,Hendriks AJ,Dorne JLCM,Ragas AMJ

更新日期：2020-01-01 00:00:00

abstract：:Generally recognized as safe (GRAS), a system for review and approval of ingredients for addition to food, was conceived at a time when the need for a less doctrinaire review of food ingredients was critical. The GRAS approval process for a food ingredient relies on the judgment of "...experts qualified by scientific ...

journal_title：Toxicology letters

authors： Burdock GA,Carabin IG

更新日期：2004-04-15 00:00:00

abstract：:Lead (Pb) exposure impairs the nervous system, of which the injury of cognitive development is obvious. But the mechanism of Pb induced disorders of neuro-transmission remain elusive. In this study, primary hippocampal neurons were exposed to Pb at the dosage of 5 μM from days in vitro (DIV) 3 to DIV14 and the electro...

journal_title：Toxicology letters

authors： Ding JJ,Zou RX,He HM,Lou ZY,Xu Y,Wang HL

更新日期：2018-10-15 00:00:00

abstract：:1. The oocyte of the African clawed toad (Xenopus laevis) offers a reliable, sensitive and disease resistant system to investigate recombinantly and endogenously expressed Ca2+ signaling G protein-coupled receptors and their intracellular signaling pathways. 2. To study receptor induced Ca2+ release, two-electrode vol...

journal_title：Toxicology letters

authors： Nietgen GW,Hönemann CW,Durieux ME

更新日期：1998-11-23 00:00:00

abstract：:The effect of paraquat on lung subcellular calcium transport was studied in male Sprague-Dawley rats. With a high dose of 30 mg/kg given i.p., a significant decrease in the lung mitochondrial and microsomal calcium uptake at 24, 48, and 72 h after paraquat was observed. Trend of recovery was evident at 96 h in the sur...

journal_title：Toxicology letters

authors： Agarwal AK,Coleman JW

更新日期：1988-09-01 00:00:00

abstract：:The effect of salicylate, the active metabolite of aspirin (acetyl salicylic acid) in the presence of Ca2+ and phosphate on mitochondrial permeability transition (MPT) was studied. MPT is often associated with opening of a Ca2+ -induced pore. The opening of this pore leads to swelling, loss of mitochondrial membrane p...

journal_title：Toxicology letters

authors： Al-Nasser IA

更新日期：1999-03-08 00:00:00

abstract：:A direct continuous spectrophotometric assay to measure pyrethroid-cleaving enzymes in human serum was developed using cis- and trans-alpha-naphthyl-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylate (cis- and trans-naphthyl-Cl2CA). These substrates show a structure very similar to the pyrethroids most often use...

journal_title：Toxicology letters

authors： Butte W,Kemper K

更新日期：1999-06-30 00:00:00

abstract：:Occupational high-grade lead exposure has been reduced in recent decades as a result of increased regulation. However, environmental lead exposure remains widespread, and is associated with severe toxicity implicated in human diseases. We performed oral intragastric administration of various dose lead acetate to adult...

journal_title：Toxicology letters

authors： Liu J,Jia DY,Cai SZ,Li CP,Zhang MS,Zhang YY,Yan CH,Wang YP

更新日期：2015-05-19 00:00:00

abstract：:Lead (Pb) alters the susceptibility to different pathogens suggesting that macrophage-mediated defense mechanisms, through activation of toll-like receptors (TLRs), may be affected by Pb. The aim of this study was to test whether activation of TLR4 is a targeted molecule to the effect of environmentally relevant Pb co...

journal_title：Toxicology letters

authors： Luna AL,Acosta-Saavedra LC,Martínez M,Torres-Avilés N,Gómez R,Calderón-Aranda ES

更新日期：2012-11-15 00:00:00

abstract：:In recent years physiologically based pharmacokinetic (PBPK) modeling has found frequent application in risk assessments where PBPK models serve as important adjuncts to studies on modes of action of xenobiotics. In this regard, studies on mode of action provide insight into both the sites/mechanisms of action and the...

journal_title：Toxicology letters

authors： Andersen ME

更新日期：2003-02-18 00:00:00

abstract：:Melamine (MA) exposure causes male reproductive toxicity, however, the mechanism remains unclear. In this study, we investigated the roles of the blood-testis barrier (BTB) in MA-induced reproductive toxicity in piglets. Male weaned piglets were exposed to MA concentrations of 0, 100, 300, and 1000 mg/kg in the diet f...

journal_title：Toxicology letters

authors： Chang L,Lu Z,Li D,Zhang L,Wang Z,Du Q,Huang Y,Zhao X,Tong D

更新日期：2018-10-15 00:00:00

abstract：:There is accumulating evidence that both type I and type II DNA-topoisomerases play a key role in cellular differentiation. Human HL-60 leukemia cells can be induced to monocytic or granulocytic differentiation with various compounds; amongst them camptothecin, a topoisomerase I inhibitor and VP-16, VM-26 and mitoxant...

journal_title：Toxicology letters

authors： Gieseler F,Boege F,Clark M,Meyer P

更新日期：1993-04-01 00:00:00

abstract：:Regions with heavy industry are in many ways regions of crisis. The health of the population is primarily affected by the different air pollutants. Dust, with all its organic (dioxins and furans) and inorganic (heavy metals) contents, makes up the greatest part of the air-borne pollutants. The influence on health of e...

journal_title：Toxicology letters

authors： Marth E,Haselbacher-Marko S,Schaffler K

更新日期：1996-11-01 00:00:00

abstract：:The direct or indirect interference with GABA-mediated neurotransmission results in convulsive seizure activity in humans and experimental animals. When this convulsant effect is experimentally analyzed, it turns out to be a product of discrete and restricted cerebral sites of drug action. Depending upon the brain cir...

journal_title：Toxicology letters

authors： Gale K

更新日期：1992-12-01 00:00:00

abstract：:Recent epidemiological studies in the United States and in Europe indicate, that the coarse fraction (PM-10) of airborne particulates, smaller than 10 microm and particularly the fine fraction (PM-2.5) smaller than 2.5 microm are responsible for adverse health effects, causing an increasing morbidity and mortality. Fu...

journal_title：Toxicology letters

authors： Hornberg C,Maciuleviciute L,Seemayer NH,Kainka E

更新日期：1998-08-01 00:00:00

abstract：:The exposure to cuprizone (CPZ) leads to demyelination in the central nervous system in rodents. To examine the developmental effects of CPZ exposure on hippocampal neurogenesis, pregnant rats were treated with 0, 0.1 or 0.4% CPZ in the diet from gestational day 6 to day 21 after delivery. On postnatal day 21, male of...

journal_title：Toxicology letters

authors： Abe H,Tanaka T,Kimura M,Mizukami S,Imatanaka N,Akahori Y,Yoshida T,Shibutani M

更新日期：2015-05-05 00:00:00

abstract：:This paper reviews the results from past regulatory and mechanistic inhalation studies in rats with the type II pyrethroid Cyfluthrin. Apart from many chemical irritants, Cyfluthrin was shown to be a neuroexcitatory agent without any inherent tissue-destructive or irritant property. Thus, any Cyfluthrin-induced neuroe...

journal_title：Toxicology letters

authors： Pauluhn J

更新日期：2018-01-05 00:00:00

abstract：:Metallothionein (MT) is inducible by various stimuli such as metals and physiological stress. Although elevated MT expression in certain type of tumors has been reported, there are few data available on the roles of MT in tumor formation. In this study, we immunohistochemically examined MT expression in gluthathione S...

journal_title：Toxicology letters

authors： Sawaki M,Enomoto K,Hattori A,Tsuzuki N,Sawada N,Mori M

更新日期：1999-07-30 00:00:00

abstract：:cis-Diamminedichloroplatinum(II) (cisplatin) is one of the most effective antitumor agents currently available for cancer chemotherapy. Unfortunately, its clinical use is severely limited by its dose-dependent nephrotoxicity. Recently, it has been reported that this nephrotoxicity is associated with an increase in lip...

journal_title：Toxicology letters

authors： Sadzuka Y,Shoji T,Takino Y

更新日期：1991-07-01 00:00:00

abstract：:The effect of a single i.p. injection of 0, 20, 200, and 1000 microliter/kg carbon tetrachloride on the activity of the hepatic drug-metabolizing enzyme system was measured in the rat by a model substrate assay employing lindane (gamma-hexachlorocyclohexane) and by a battery of in vitro enzyme assays. The data in this...

journal_title：Toxicology letters

authors： Chadwick RW,Copeland MF,Carlson GP,Trela BA,Most BM

更新日期：1988-09-01 00:00:00

abstract：:Conversion of hepatic stellate cells (HSCs) into hepatic myofibroblasts is a necessary event during the development of liver fibrosis. DNA methyltransferase 1 (DNMT1), which catalyzes DNA methylation and subsequently leads to the transcriptional repression of profibrotic genes, is selectively induced in myofibroblasts...

journal_title：Toxicology letters

authors： Bian EB,Huang C,Wang H,Chen XX,Zhang L,Lv XW,Li J

更新日期：2014-01-13 00:00:00

abstract：:Polycyclic aromatic hydrocarbons (PAHs) are an important group of environmental pollutants, known for their mutagenic and carcinogenic activities. Many PAHs are aryl hydrocarbon receptor (AhR) ligands and several recent studies have suggested that PAHs or their metabolites may activate estrogen receptors (ER). The pre...

journal_title：Toxicology letters

authors： Kummer V,Masková J,Zralý Z,Neca J,Simecková P,Vondrácek J,Machala M

更新日期：2008-08-28 00:00:00

abstract：:Intraperitoneal (i.p.) administration of a cadmium (Cd) salt at concentrations of 1.0, 2.5 and 4.0 mg CdCl2/kg body wt. caused severe liver injury in rats 24 h after administration. The toxic effects were most evident in the intermediate dose of 2.5 mg. Thymidine kinase (TK), the key enzyme of the salvage pathway of D...

journal_title：Toxicology letters

authors： Theocharis SE,Margeli AP,Ghiconti IK,Varonos D

更新日期：1992-11-01 00:00:00

abstract：:BH3 mimetics, such as BH3I-1, act as Bcl-2 antagonists, promote apoptosis and are used in basic research studies on apoptotic signaling and are currently tested as experimental anti-tumor agents. The present study addresses time- and dose-dependent responses of BH3I-1 on apoptosis, cellular stress defense mediated by ...

journal_title：Toxicology letters

authors： Stucki D,Brenneisen P,Reichert AS,Stahl W

更新日期：2018-10-01 00:00:00