Abstract:
:The target cell(s) of theobromine toxicity on rat testes and reproductive toxicity induced by pure theobromine and cocoa extract are evaluated in the present studies. Theobromine (500 mg/kg x 7 days) inhibited body weight gain in treated rats. Decreased cauda epididymal sperm reserve (38%), seminiferous tubule fluid (STF) volume (33%), lactate concentration in STF (22%), inhibition of binding activity of androgen binding protein (ABP, 21%) and reduced ABP content in STF were also observed in theobromine-treated animals. Cocoa extract containing an equivalent amount of theobromine did not produce significant toxicity in treated rats. Theobromine concentrations in serum and testes from pure theobromine-treated rats were 1.8- and 1.6-fold higher, respectively, than that in rats treated with cocoa extract. The results support Sertoli cells as the primary target cells of theobromine toxicity. The lower theobromine concentrations in serum and testes of cocoa extract-treated rats could account for the lower toxicity in these animals.
journal_name
Toxicol Lettjournal_title
Toxicology lettersauthors
Wang Y,Waller DPdoi
10.1016/0378-4274(94)90159-7subject
Has Abstractpub_date
1994-02-01 00:00:00pages
155-64issue
2eissn
0378-4274issn
1879-3169pii
0378-4274(94)90159-7journal_volume
70pub_type
杂志文章abstract::Environmental exposure to the highly persistent chlorinated pesticides including dieldrin and lindane is postulated to be a risk factor to the development of Parkinson's disease, a devastating movement disorder. We have previously reported that the combined treatment with dieldrin and lindane induces a cooperative tox...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2018.09.006
更新日期:2018-12-15 00:00:00
abstract::Cigarette smoking is the strongest risk factor for lung cancer (LC), but genetically determined variations in pulmonary metabolism of tobacco-derived carcinogens may affect individual risk. Results from a case-control study on LC patients demonstrated the pronounced effect of tobacco smoke on pulmonary xenobiotic meta...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(92)90222-6
更新日期:1992-12-01 00:00:00
abstract::The acute toxicity of organothiophosphate insecticides like parathion results from their metabolic activation by cytochromes P450. The present study is directed towards the characterization of cytochrome-P450-dependent metabolism of parathion by various mouse brain regions. Intraperitoneal administration of [35S]parat...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(92)90044-k
更新日期:1992-01-01 00:00:00
abstract::The main aim of the study was to identify the critical periods of susceptibility for itraconazole-mediated teratogenesis in the mouse. Pregnant ICR (CD-1) mice received a single oral administration of itraconazole at 50 mg/kg b.w., 150 mg/kg b.w. or 250 mg/kg b.w. on gestation day 8, 9, 10, 11 or 12. Control animals w...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2006.08.004
更新日期:2006-11-01 00:00:00
abstract::Mice given single i.v. doses of some radiopharmaceuticals containing stannous chloride as a reducing agent, showed significant inhibition of hepatic azo-reductase and aromatic hydroxylase activity at dose levels which contained as little as 0.2 mg/kg of stannous chloride. Cytochrome P-450 content was also reduced sign...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(83)90105-4
更新日期:1983-09-01 00:00:00
abstract::The handling of elemental gallium is not thought to be harmful, but this assumption does not consider metal coordination which readily occurs in physiological fluids. The aim of this work was to determine Ga(III) coordination behaviour in simple solutions and assess the effects of complex formation upon skin permeatio...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2011.01.017
更新日期:2011-05-10 00:00:00
abstract::Benzo(a)pyrene (B(a)P), a potent environmental procarcinogen, has been shown to cause cell cycle alternation. However, the mechanisms involved in this effect are not well understood yet. Our current results demonstrated that B(a)P exposure led to cell proliferation and a 33.5% increase in S phase cells as well as a 26...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2007.02.008
更新日期:2007-04-05 00:00:00
abstract::The effect of two herbicides (paraquat and 2,4-dichlorophenoxybutyric acid) and two fungicides (mancozeb and captafol) was studied on the growth of Flagellospora penicillioides, Lunulospora curvula and Phalangispora constricta using the poisoned-food technique. The pesticides did not produce any inhibition of growth a...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(89)90058-1
更新日期:1989-09-01 00:00:00
abstract::When 3-nitropropanol (NPOH) was injected into the rumen (30 mg/kg), abomasum (10 mg/kg) or small intestine (10 mg/kg) of sheep, it was rapidly absorbed and converted to 3-nitropropionic acid (NPA). The reticulo-rumen was the major site of absorption for the miserotoxin aglycone but the abomasum and the small intestine...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(84)90002-x
更新日期:1984-10-01 00:00:00
abstract::The upregulated α-synuclein (α-syn) and Tau co-occur in methamphetamine (METH) abusers' brains. Here, we designed experiments mainly to investigate whether α-syn and Tau interact in METH exposure. We detected the expression of α-syn, total Tau, and phosphorylation of Tau at Serine 396 (pSer396 Tau) under in vitro and ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2019.11.028
更新日期:2020-02-01 00:00:00
abstract::We investigated the cytotoxic effects of formaldehyde (FA) on lymphocytes. FA-exposed mice showed a profound reduction not only in the number of natural killer (NK) cells but also in the expression of NK cell-specific receptors, but these mice did not exhibit decreases in the numbers of T or B lymphocytes. FA exposure...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2013.09.008
更新日期:2013-11-25 00:00:00
abstract::Various hypotheses on the origin of cancer stem cells (CSCs) exist, including that CSCs develop from transformed human bone marrow mesenchymal stem cells (hBMSC). Since the polyether antibiotic salinomycin selectively kills CSCs, the present study aims to elucidate the effects of salinomycin on normal hBMSC. The immun...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2013.02.001
更新日期:2013-04-26 00:00:00
abstract::Data on occurrence of dioxins (polychlorinated dibenzo-p-dioxins [PCDDs] and dibenzofurans [PCDFs]), dioxin-like PCBs (polychlorinated non-ortho and mono-ortho biphenyls) and non-dioxin-like PCBs (as represented by the so-called indicator-PCBs: congeners 28, 52, 101, 118, 138, 153 and 180) in food products consumed in...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2004.01.028
更新日期:2004-06-15 00:00:00
abstract::Olefinic hydrocarbons are metabolized in vivo by cytochrome P450-dependent monooxygenases to the corresponding epoxides. The maximum in vivo metabolic rate, which is an important toxicokinetic parameter, has been used to define the apparent rate constant (kapp) describing in vivo metabolic reactivity of alkenes. To de...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(94)03174-6
更新日期:1995-01-01 00:00:00
abstract::Iron plays a critical role in a mammal's physiological processes. However, iron tissue deposits have been shown to act as endocrine disrupters. Studies that evaluate the effect of acute iron overload on hypothalamic-pituitary-gonadal (HPG) axis health are particularly sparse. This study demonstrates that acute iron ov...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2015.10.027
更新日期:2016-01-05 00:00:00
abstract::Serum corticosterone levels were determined at intervals after i.p. injection of 1.8 mg cadmium (Cd)/kg body weight. Thymus weight decreased significantly 3 days after injection. The effect of Cd injection on serum corticosterone levels was almost indistinguishable from that of saline injection. Further, Cd-induced th...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(82)90244-2
更新日期:1982-08-01 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::To understand the underlying mechanism for apoptosis induced by titanium dioxide nanoparticles (TNP), human airway epithelial cell line was cultured to investigate the relevant apoptosis pathways. Our results showed that the levels of reactive oxygen species and morphological apoptosis increased in a dose-dependent ma...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2010.03.014
更新日期:2010-06-16 00:00:00
abstract::The grazing trial at Kidston Gold Mine, North Queensland, was aimed specifically to assess the uptake of metals from the tailing and the potential for unacceptable contamination of saleable meat. Further aims included estimating metal dose rates and identifying potential exposure pathways including plant uptake of hea...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/s0378-4274(02)00378-8
更新日期:2003-01-31 00:00:00
abstract::A number of zero tolerance provisions are contained in both food and animal feed law, e.g. for chemical substances whose occurrence is not permitted or is directly prohibited in food or animal feed. In the European Union, bans of this kind were introduced to give consumers and animals the greatest possible protection ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2007.10.002
更新日期:2007-12-10 00:00:00
abstract::An unusual case of fatal poisoning by delta-9-tetrahydrocannabinol (delta-9-THC)--a physiologically active constituent of cannabis--is reported. Methods of isolation and detection of delta-9-THC was estimated quantitatively by thin-layer chromatography (TLC) and photoelectric densitometry. ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(80)90073-9
更新日期:1980-03-01 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::Cigarette smoke (CS) is known to cause mitochondrial dysfunction leading to cellular senescence in lung cells. We determined the mechanism of mitochondrial dysfunction by CS in lung epithelial cells. CS extract (CSE) treatment differentially affected mitochondrial function, such as membrane potential, mitochondrial re...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2019.09.022
更新日期:2019-12-15 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
pub_type: 杂志文章,评审
doi:10.1016/j.toxlet.2017.10.003
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::We recently showed in a rat model of dichromate-induced acute renal failure (ARF) that the elimination but not the distribution of pralidoxime was altered resulting in sustained plasma pralidoxime concentrations. The aim of this study was to compare the efficiency of pralidoxime in normal and acute renal failure rats ...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2009.04.020
更新日期:2009-08-25 00:00:00
abstract::Chronic feeding of male Wistar rats with food containing hexachlorobenzene (HCB) at 17.5 mmol/kg induced elevation of serum amino-transferases and bilirubin content, increase of microsomal cytochrome P-450 concentration, and decrease of 5'-nucleotidase, K+,Na+- and Mg2+-adenosine triphosphatase activities in liver pla...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/0378-4274(86)90118-9
更新日期:1986-09-01 00:00:00
abstract::Pyrethroid pesticides are used preferably over organochlorines and organophosphates due to their high effectiveness, low toxicity to non-target organisms and easy biodegradibility. However, it is possible that during the pyrethroid metabolism, there is generation of reactive oxygen species (ROS) and pyrethroids may pr...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/s0378-4274(98)00399-3
更新日期:1999-04-12 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
pub_type: 杂志文章
doi:10.1016/0378-4274(88)90116-6
更新日期:1988-09-01 00:00:00
abstract::In recent years, interesterified fat (IF) has been used to replace hydrogenated vegetable fat (HVF), rich in trans isomers, being found in processed foods. Studies involving IF have shown deleterious influences on the metabolic system, similarly to HVF, whereas no studies regarding its influence on the central nervous...
journal_title:Toxicology letters
pub_type: 杂志文章
doi:10.1016/j.toxlet.2017.05.020
更新日期:2017-07-05 00:00:00