Abstract:
:The plastic chemical bisphenol A (BPA) has recently been suspected to be a base structure of endocrine disrupting chemicals, which achieve their adverse effects by interfering with human nuclear receptors. For instance, BPA, bisphenol AF, and tetrabromo- or tetrachloro-BPA (X₄-BPA) have been characterized as binders for ERRγ, ER, and PPARγ, respectively. This ongoing string of findings has led to apprehension that some other BPA derivatives might also perturb important human nuclear receptors. The retinoid-related orphan receptor RORγ has been strongly suspected to be a target of highly hydrophobic chemical substances because of its extreme affinity for lipophilic sterols. In the present study, we tested a series of BPA derivatives for their ability to bind to RORγ, and identified two distinctly potent derivatives having isopropyl or sec-butyl groups at positions adjacent to the BPA-4-hydroxyl group. In particular, di-sec-butyl-BPA has emerged as a considerably potent ligand (IC₅₀)=146 nM). In the reporter gene assay, these compounds suppressed the basal constitutive transcriptional activity originally induced by wild-type RORγ. The present results strongly suggested that RORγ, and perhaps also RORα and RORβ, binds highly hydrophobic and sterically hindered chemical substances, inducing some unspecified physiological and biochemical disruptions.
journal_name
Toxicol Lettjournal_title
Toxicology lettersauthors
Nishigori M,Nose T,Shimohigashi Ydoi
10.1016/j.toxlet.2012.05.020subject
Has Abstractpub_date
2012-07-20 00:00:00pages
205-11issue
2eissn
0378-4274issn
1879-3169pii
S0378-4274(12)01145-9journal_volume
212pub_type
杂志文章abstract::Isolated rat hepatocytes incubated aerobically formed measurable amounts of ethane, a parameter for lipid peroxidation. This ethane formation increased several-fold due to carbon tetrachloride (CCl4) depending on its concentration. Cell damage as measured by trypan blue uptake and lactate dehydrogenase release poorly ...
journal_title:Toxicology letters
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journal_title:Toxicology letters
pub_type: 杂志文章
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journal_title:Toxicology letters
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更新日期:2010-04-01 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章,评审
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journal_title:Toxicology letters
pub_type: 杂志文章
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abstract::In humans organophosphorothionate pesticides (OPT) prenatal exposure has been demonstrated. Since OPT-induced neurodevelopmental effects may be due to in situ bioactivation by foetal enzymes, the catalytic activity of the foetal CYP3A7 toward chlorpyrifos (CPF), parathion (PAR), malathion (MAL) and fenthion (FEN) has ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2006.10.006
更新日期:2006-12-15 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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更新日期:1997-09-19 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2018.01.005
更新日期:2018-04-01 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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journal_title:Toxicology letters
pub_type: 杂志文章
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更新日期:2015-05-05 00:00:00
abstract::Iron is a unique poison because it is not a xenobiotic. It is an essential element and highly reactive. Because of the critical dependence upon iron and its potential to damage tissues, elaborate mechanisms have evolved for its efficient absorption, transport, cellular uptake, storage and conservation. These are incom...
journal_title:Toxicology letters
pub_type: 杂志文章
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更新日期:1998-12-28 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2015.12.004
更新日期:2016-01-22 00:00:00
abstract::The US Environmental Protection Agency (EPA) in 1999 issued draft guidelines on carcinogen risk assessment, which included the use mode of action information in the risk assessment process. We have used the five stages of induction of toxicity as described by Aldridge to illustrate in the case of two drugs, tamoxifen ...
journal_title:Toxicology letters
pub_type: 杂志文章,评审
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更新日期:2003-04-11 00:00:00
abstract::Di-(2-ethylhexyl)-phthalate (DEHP) is a phthalate ester that binds peroxisome proliferator-activated receptor α (PPARα) to induce proliferation of peroxisomes and regulate the expression of specific target genes. The question of whether the effect of DEHP on female reproductive processes is mediated via PPARα-dependen...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2014.04.019
更新日期:2014-08-04 00:00:00
abstract::Traditional gold mining, using metallic mercury (Hg(0)) to form gold amalgam, followed by burning to remove the Hg(0), is widely used in South America, Africa and Asia. The gold is sold to merchants who burn it again to eliminate remaining Hg(0). In Ecuador, 200 gold miners, 37 gold merchants and 72 referents were stu...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2011.09.006
更新日期:2012-08-13 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2019.12.027
更新日期:2020-05-15 00:00:00
abstract::This study was conducted to evaluate whether vitamin C (VC) was associated with total antioxidant status (TAS) in human plasma and to determine the usefulness of VC on TAS in the treatment of patients with paraquat poisoning. VC and TAS were measured in 56 healthy subjects. Then, various concentrations (1-100 mg/dl) o...
journal_title:Toxicology letters
pub_type: 临床试验,杂志文章
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更新日期:2002-01-05 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2011.04.010
更新日期:2011-09-25 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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更新日期:1983-09-01 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
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更新日期:1986-05-01 00:00:00
abstract::The relative deposition of inhaled heterodisperse particles of the size of environmental tobacco smoke (ETS, mass median aerodynamic diameter 0.2 micron, geometric standard deviation 1.5) is about the same in the tracheobronchial tree and is lower in the pulmonary region of the rat than in the same regions of humans. ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(87)90093-2
更新日期:1987-01-01 00:00:00
abstract::Pregnant mice of C57BL/6 and DBA/2 inbred strains were exposed to cigarette smoke during days 1-18 of pregnancy. Both mothers and offspring were killed at the age of 21-22 weeks, and ovaries were studied with respect to the number of primordial follicles and small primary follicles. In additional studies, 7,12-dimethy...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(85)90103-1
更新日期:1985-04-01 00:00:00
abstract::Acetaminophen is a widely used analgesic, which has exhibited evidence of estrogenic activity in estrogen-receptor positive human breast cancer cells. However, there is limited in vivo experimentation regarding the estrogenicity of acetaminophen. Therefore, the present study examined the in vivo estrogenic potential o...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/s0378-4274(01)00352-6
更新日期:2001-05-31 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
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更新日期:1998-11-23 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(88)90146-4
更新日期:1988-11-01 00:00:00
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journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2016.02.001
更新日期:2016-04-15 00:00:00
abstract::Spontaneous and mitomycin C-induced sister chromatid exchanges (SCEs) in lymphocytes were analyzed in 24 non-smokers and 24 sex- and age-matched smokers. Mean spontaneous SCE frequency for non-smokers was 9.8 SCEs/cell, and that for smokers was 11.5 SCEs/cell. The difference was statistically significant (P less than ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(85)90210-3
更新日期:1985-06-01 00:00:00
abstract::Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons in the substantia nigra (SN) and depletion of striatal dopamine (DA), leading to a range of motor symptoms, including resting tremor, rigidity, bradykinesia and postural abnormalities. The neurotoxin (MPTP) and its active metabol...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2013.03.003
更新日期:2013-05-23 00:00:00