Abstract:
:The blood-cerebrospinal fluid barrier (BCB) plays a key role in maintaining copper (Cu) homeostasis in the brain. Cumulative evidences indicate that lead (Pb) exposure alters cerebral Cu homeostasis, which may underlie the development of neurodegenerative diseases. This study investigated the roles of Cu transporter 1 (CTR1) and ATP7A, two Cu transporters, in Pb-induced Cu accumulation in the choroidal epithelial cells. Pb exposure resulted in increased intracellular (64)Cu retention, accompanying with up-regulated CTR1 level. Knockdown of CTR1 using siRNA before Pb exposure diminished the Pb-induced increase of (64)Cu uptake. The expression level of ATP7A was down-regulated following the Pb exposure. ATP7A siRNA knockdown, or PCMB treatment, inhibited the (64)Cu efflux from the cells, while the following additional incubation with Pb failed to further increase the intracellular (64)Cu retention. Cu exposure, or intracellular Cu accumulation following the tetracycline (Tet)-induced overexpression of CTR1, did not result in significant change in ATP7A expression. Taken together, these data indicate that CTR1 and ATP7A play important roles in Cu transport in choroidal epithelial cells, and the Pb-induced intracellular Cu accumulation appears to be mediated, at least in part, via the alteration of CTR1 and ATP7A expression levels following Pb exposure.
journal_name
Toxicol Lettjournal_title
Toxicology lettersauthors
Zheng G,Zhang J,Xu Y,Shen X,Song H,Jing J,Luo W,Zheng W,Chen Jdoi
10.1016/j.toxlet.2013.11.034subject
Has Abstractpub_date
2014-02-10 00:00:00pages
110-8issue
1eissn
0378-4274issn
1879-3169pii
S0378-4274(13)01456-2journal_volume
225pub_type
杂志文章abstract::International scientific committees, regional scientific committees such as those of the European Union, and national regulatory agencies generally use the uncertainly factor approach for establishing acceptable or tolerable intakes of substances that exhibit thresholds of toxicity. No observed adverse effect levels (...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
doi:10.1016/j.toxlet.2008.06.003
更新日期:2008-08-15 00:00:00
abstract::Hormonally active chemicals in the human diet, such as man-made estrogenic chemicals or plant-derived compounds (phytoestrogens), have become a matter of public concern. A significant part of human exposure to phytoestrogens is attributable to soy isoflavones. Besides their estrogenic properties, soy isoflavones also ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2004.04.005
更新日期:2004-06-15 00:00:00
abstract::5-Azactydine inhibits cell growth by direct cytotoxic action as well as by inhibition of DNA methyl transferase enzyme. Inhibitors of DNMT have been reported to potentiate the therapeutic activity of cisplatin in vitro. Dose dependent bone marrow toxicity, neurotoxicity and nephrotoxicity are the major side effects of...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2009.08.018
更新日期:2009-12-15 00:00:00
abstract::Malignant gliomas are the most common and most aggressive primary brain tumor, and for which differentiation therapy has emerged as a promising candidate strategy. In this study, we used in vitro and in vivo assays to examine the differentiation effects of wogonin, a major active constituent of Scutellaria baicalensis...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2013.07.013
更新日期:2013-10-24 00:00:00
abstract::The mutagenic potential of fluphenazine hydrochloride was tested on male germ cells of Drosophila melanogaster. The criterion used was sex-linked recessive lethal mutations. Oregon-K males of D. melanogaster, reared on a medium containing 0.01, 0.02 and 0.03 mg/ml of the drug, were screened for sex-linked recessive le...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(80)90050-8
更新日期:1980-12-01 00:00:00
abstract::The aim of this study was to determine the toxicokinetics and some effects of 1,1,1-trifluoroethane (HFC-143a) in humans. Nine male volunteers were experimentally exposed to 500ppm HFC-143a for 2h during light physical exercise (50W) in an exposure chamber. Blood, urine and exhaled air were sampled before, during and ...
journal_title:Toxicology letters
pub_type: 临床试验,杂志文章
doi:10.1016/j.toxlet.2007.05.010
更新日期:2007-08-01 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
pub_type: 历史文章,杂志文章,评审
doi:10.1016/j.toxlet.2003.07.004
更新日期:2004-04-15 00:00:00
abstract::This study describes two phases of a multi-phase project aiming to validate a mouse model for cow's milk allergy to assess the potential allergenicity of hydrolysed cow's milk based infant formulas (claim support EC-directive 2006/141/E). The transferability and the discriminatory power of this model was evaluated in ...
journal_title:Toxicology letters
pub_type: 杂志文章,多中心研究
doi:10.1016/j.toxlet.2013.04.008
更新日期:2013-06-20 00:00:00
abstract::About two decades ago in vitro mutagenicity tests were adopted as the first in vitro methods in regulatory toxicology. For reasons of animal welfare and better science, many validation studies of various in vitro methods were performed between 1985 and 1995 for their potential to replace the Draize eye irritation test...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
doi:10.1016/s0378-4274(01)00492-1
更新日期:2002-02-28 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
pub_type: 杂志文章
doi:10.1016/j.toxlet.2013.10.038
更新日期:2014-01-13 00:00:00
abstract::Computer simulation can be used to integrate existing toxicity information within a biologically realistic framework. Simulation models calculate relevant measures of target tissue dose based on physiological, biochemical and physicochemical properties and readily support the dose, route, species and interchemical ext...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
doi:10.1016/0378-4274(89)90029-5
更新日期:1989-12-01 00:00:00
abstract::In this study, we aimed to evaluate the genotoxic effects of fungicides fenarimol and propamocarb which are used to protect crops from fungi. For this reason, bone-marrow micronucleus and chromosome aberration tests were carried out in Swiss albino mice. Mice were injected with four different doses of fenarimol and pr...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2003.10.015
更新日期:2004-02-28 00:00:00
abstract::Polyhexamethylene guanidine (PHMG) phosphate is a competitive disinfectant with strong antibacterial activity. However, epidemiologists revealed that inhaled PHMG-phosphate may increase the risk of pulmonary fibrosis associated with inflammation, resulting in the deaths of many people, including infants and pregnant w...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2015.01.005
更新日期:2015-03-04 00:00:00
abstract::Explants from first-trimester placentae obtained from non-smoking women were incubated with doses of 0, 0.75, 1.5, 3, 6 and 12 micrograms of cadmium (Cd) as CdCl2 for 6 or 24 h. At the end of the incubation period, the activities of placental aryl hydrocarbon hydroxylase (AHH) (a phase I enzyme), quinone reductase (QR...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(92)90270-t
更新日期:1992-04-01 00:00:00
abstract::Trihalomethanes (THMs; chloroform, bromoform, bromodichloromethane, dibromochloromethane), formed as by-products of chlorine disinfection, are found to occur in combination in drinking water supplies. THMs are metabolized by cytochromes P-450 and are likely substrates of CYP2E1. Therefore, it is possible that mixed ex...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/s0378-4274(99)00022-3
更新日期:1999-05-20 00:00:00
abstract::Exposition to cadmium (Cd) has been linked to bone metabolism alterations and occurrence of osteoporosis. Despite its known renal toxicity which indirectly disrupts bone metabolism through impairment of vitamin D synthesis, increasing evidence argues for the direct action of Cd on bone-forming osteoblasts. Indeed, acc...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2012.10.006
更新日期:2012-12-17 00:00:00
abstract::Eugenol, a natural phenolic constituent of clove oil, has a wide range of applications in medicine as a local antiseptic and anesthetic. However, the effect of eugenol on human glioblastoma is unclear. This study examined whether eugenol elevated intracellular free Ca(2+) levels ([Ca(2+)]i) and induced apoptosis in DB...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2014.10.023
更新日期:2015-01-05 00:00:00
abstract::Benzophenone-3 (2-hydroxy-4-methoxybenzophenone, BZ-3) is a UV absorber that is used extensively in medicine, cosmetics and industry as a sunscreen and color fastener. Exposure to the chemical is through the dermal and oral route. Bioavailability of the chemical absorbed through the skin is different from that seen th...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(94)90101-5
更新日期:1994-08-01 00:00:00
abstract::Aluminum phosphide (AlP), a widely used fumigant and rodenticide leads to high mortality if ingested. Its toxicity is due to phosphine liberated when it comes in contact with moisture. The exact mechanism of action of phosphine is not known. In this study male Wistar rats were used. The animals received a single dose ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2012.09.020
更新日期:2012-11-23 00:00:00
abstract::The E-rosetting profiles of T-cells were studied in 47 subjects with a history of poly-drug and alcohol abuse, and compared with 15 normal controls. No change was evident in numbers of total rosette-forming cells (TRFC). However, there was reduction in active and high-affinity rosette-forming cells (ARFC and HARFC). T...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(91)90208-n
更新日期:1991-08-01 00:00:00
abstract::Small molecular weight chemicals may irritate tissues via the induction of the production of various proinflammatory and chemotactic molecules. The structure of these irritants is heterogenous, as is the pattern of their effects. Chemicals are potentially allergenic (i.e. haptens) when they are able to bind proteins s...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
doi:10.1016/0378-4274(96)03676-4
更新日期:1996-08-01 00:00:00
abstract::The efflux transporter breast cancer resistance protein (BCRP/ABCG2) decrease intestinal absorption of many food toxicants. Oleic acid increases absorption of the specific BCRP substrate mitoxantrone (MXR), and also BCRP gene expression in human intestinal Caco-2 cells, suggesting that oleic acid affect the BCRP funct...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2015.06.009
更新日期:2015-09-02 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
pub_type: 杂志文章,评审
doi:10.1016/s0378-4274(98)00201-x
更新日期:1998-11-23 00:00:00
abstract::The cytogenetic effects of phenobarbitone were studied in the male germ cells of Swiss mice. The drug was orally administered at 42, 84 and 126 mg/kg body weight dose levels by sub-acute and chronic modes of treatment. In the treated series, the incidence of chromosome aberrations was significant at all dose levels. H...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(82)90002-9
更新日期:1982-11-01 00:00:00
abstract::Rat and canine hepatocyte suspensions were exposed to toxic concentrations of ethyl methanesulfonate (EMS) and ionophore A-23187 in the presence and absence of extracellular calcium (Ca2+) and alpha-tocopheryl succinate (alpha-TS). The exogenous administration of alpha-TS (25 microM) completely protected hepatocytes f...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(89)90086-6
更新日期:1989-04-01 00:00:00
abstract::Pneumotoxicity of butylated hydroxytoluene (BHT) applied to the skin of CD-1 mice was investigated and compared with that of butylated hydroxyanisole (BHA). To 6 groups of 10 male mice and 10 female mice 0.1 ml of dimethylsulfoxide (DMSO) solutions containing 0, 5, 10, 20, or 30 mg of BHT or 30 mg of BHA were topicall...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(86)90151-7
更新日期:1986-11-01 00:00:00
abstract::In order to elucidate the mechanisms by which long-term treatment with clobazam (CLB), 1,5-benzodiazepine, induces thyroid follicular cell tumors in male rats, male Sprague-Dawley (SD) rats were treated orally with 400 mg/kg of CLB for up to 4 weeks, and the contribution of feedback through elevated thyroid stimulatin...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2003.08.002
更新日期:2003-12-10 00:00:00
abstract::Free fatty acids (FFA), commonly elevated in diabetes and obesity, have been shown to impair endothelial functions and cause oxidative stress, inflammation, and insulin resistance. Anthocyanins represent one of the most important and interesting classes of flavonoids and seem to play a role in preventing cardiovascula...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2015.09.020
更新日期:2015-12-15 00:00:00
abstract::Biological monitoring in humans (HBM) is widely used in the field of occupational and environmental health. In the situation of an unexpected release of hazardous materials HBM may contribute to the medical support and treatment of exposed individuals from the general population or of emergency responders. Such exposu...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2014.03.002
更新日期:2014-12-15 00:00:00
abstract::Toxicogenomics describes the measurement of global gene expression changes in biological samples exposed to toxicants. This new technology promises to greatly facilitate research into toxicant mechanisms, with the possibility of assisting in the detection of compounds with the potential to cause adverse health effects...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
doi:10.1016/s0378-4274(02)00500-3
更新日期:2003-04-11 00:00:00