Abstract:
:Teratogenicity of the anticonvulsant phenytoin may be due in part to its bioactivation by prostaglandin synthetase, forming a reactive free radical intermediate. We examined whether teratogenicity of the structurally similar oxazolidinedione anticonvulsants, trimethadione and its N-demethylated metabolite dimethadione, could be inhibited by the prostaglandin synthetase inhibitor acetylsalicylic acid (ASA). Trimethadione, 700 or 1000 mg/kg intraperitoneally (ip), was given to pregnant CD-1 mice during (Gestational Days 12 and 13) or before (Days 11 and 12) the critical period of susceptibility to phenytoin-induced fetal cleft palates. Dimethadione was given similarly on Days 11 and 12, or 12 and 13, in a dose (900 mg/kg ip) that was equimolar to 1000 mg/kg of trimethadione. ASA, 10 or 1 mg/kg ip, was given 2 hr before trimethadione or dimethadione on Days 11 and 12, and before trimethadione on Day 11 only. Dams were killed on Day 19 and fetuses were examined for anomalies. Either dose of trimethadione given on Days 12 and 13 was negligibly teratogenic, as evidenced by a non-dose-related, 1.1% mean incidence of fetal cleft palates. However, when given earlier on Days 11 and 12, trimethadione 1000 mg/kg caused an 8.9% incidence of cleft palates (p less than 0.05). Similarly, dimethadione caused a 3.9-fold higher incidence of cleft palates when given earlier on Days 11 and 12 (17.3-34.9%) than on Days 12 and 13 (4.4%) (p less than 0.05). At equimolar doses, dimethadione caused a 1.9- to 3.9-fold higher incidence of cleft palates compared to trimethadione (p less than 0.05), suggesting that dimethadione may be the proximate teratogen. Either dose of ASA given on both days before trimethadione totally prevented cleft palates, and ASA 10 mg/kg given only on Day 11 reduced the incidence of trimethadione-induced cleft palates to 1.1% (p less than 0.05). ASA reduced the incidence of cleft palates caused by dimethadione given on Days 11 and 12 from 34.9 to 20.3% (p less than 0.05). These results suggest that the teratogenic potential of trimethadione may depend at least in part upon its prior N-demethylation to dimethadione, which then can be bioactivated by prostaglandin synthetase to a teratogenic reactive intermediate, possibly involving a free radical located in the oxazolidinedione ring. This would provide a unifying hypothesis for the teratogenicity of hydantoins, as well as structurally related teratogens like trimethadione, which lack the molecular configuration necessary for the formation of a teratogenic arene oxide intermediate.
journal_name
Toxicol Appl Pharmacoljournal_title
Toxicology and applied pharmacologyauthors
Wells PG,Nagai MK,Greco GSdoi
10.1016/0041-008x(89)90245-7subject
Has Abstractpub_date
1989-03-01 00:00:00pages
406-14issue
3eissn
0041-008Xissn
1096-0333journal_volume
97pub_type
杂志文章abstract::Dithiocarbamates have a wide spectrum of applications in industry, agriculture and medicine with new applications being actively investigated. One adverse effect of dithiocarbamates is the neurotoxicity observed in humans and experimental animals. Results from previous studies have suggested that dithiocarbamates elev...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2008.01.005
更新日期:2008-05-15 00:00:00
abstract::A total of 52 monkeys (Macaca fascicularis) were dosed orally with vehicle or 1.5 mg/kg/day of lead on one of four dosing regimens (13 monkeys/group): Group 1, vehicle only; Group 2, dosed with lead from birth onward; Group 3, dosed with lead from birth to 400 days of age and vehicle thereafter; Group 4, dosed with ve...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(90)90251-o
更新日期:1990-11-01 00:00:00
abstract::Protection against the toxic effects of chronic alcohol consumption was observed in male guinea pigs maintained on a high-ascorbic-acid diet (vitamin C-deficient chow plus 2.0 mg ascorbic acid/ml drinking water) as compared to animals on a low-ascorbic-acid diet (vitamin C-deficient chow and from 0.025 to 0.050 mg asc...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(86)90141-9
更新日期:1986-06-30 00:00:00
abstract::Zidovudine (ZDV) is a thymidine analogue activated to its triphosphate (ZDVTP) by the host's intracellular enzymes. The initial phosphorylation step is conversion to ZDV monophosphate (ZDVMP). The poor affinity of ZDVMP for thymidylate kinase results in intracellular accumulation of ZDVMP. Clinical use of ZDV is assoc...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.2001.9288
更新日期:2001-11-15 00:00:00
abstract::Cerebellar granule cells are preferentially targeted during methylmercury (MeHg) poisoning. Following acute MeHg exposure, granule cells in culture undergo an increase in intracellular Ca2+ concentration ([Ca2+]i) that apparently contributes to cell death. This effect consists of several temporally and kinetically dis...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.2001.9327
更新日期:2002-01-01 00:00:00
abstract::To determine if inhaled nephrotoxic branched and nonnephrotoxic straight chain alkanes differ substantially in their biological fate, male F344 rats were exposed to 14C-labeled isooctane and octane vapors at approximately 1 and 350 ppm by the nose-only mode for 2 hr. Radioactivity in exhalant, urine, and feces was det...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(89)90319-0
更新日期:1989-09-01 00:00:00
abstract::The H295R cell bioassay was used to evaluate the potential endocrine disrupting effects of 18 of the most commonly used pharmaceuticals in the United States. Exposures for 48 h with single pharmaceuticals and binary mixtures were conducted; the expression of five steroidogenic genes, 3betaHSD2, CYP11beta1, CYP11beta2,...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2007.07.013
更新日期:2007-12-01 00:00:00
abstract::Melatonin is a modified tryptophan with potent biological activity, exerted by stimulation of specific plasma membrane (MT1/MT2) receptors, by lower affinity intracellular enzymatic targets (quinone reductase, calmodulin), or through its strong anti-oxidant ability. Scattered studies also report a perplexing pro-oxida...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.05.012
更新日期:2009-08-15 00:00:00
abstract::The discovery of the cadmium (Cd)-binding protein from horse kidney in 1957 marked the birth of research on this low-molecular weight, cysteine-rich protein called metallothionein (MT) in Cd toxicology. MT plays minimal roles in the gastrointestinal absorption of Cd, but MT plays important roles in Cd retention in tis...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章,评审
doi:10.1016/j.taap.2009.03.026
更新日期:2009-08-01 00:00:00
abstract::Colchicine-specific antibody (IgG(C] was tested in mice for reversal of colchicine toxicity. The mouse model was chosen because it reflects human pathophysiology in colchicine poisoning. IgG(C) was administered when at least 85% of colchicine was distributed in tissues. It resulted in a dramatic decrease in lethality ...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(90)90172-q
更新日期:1990-07-01 00:00:00
abstract::Organophosphorus (OP) compounds inhibit mitochondrial enzymes, respiration, and ATP generation, in addition to inducing structural changes such as matrix swelling. This implicates mitochondria as primary subcellular targets for these compounds. In this study, the health and function of cellular mitochondria following ...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1999.8741
更新日期:1999-10-01 00:00:00
abstract::The toxicity of 16 metal salts to Chinese hamster ovary (CHO) cells was determined by measuring the cloning efficiency (CE) of CHO cells after exposure to the metals. CHO cells differed by a factor of 10(5) to 10(6) in their toxic response to these metal salts. While Cd(II) was the most toxic ion, Mg(II) exhibited the...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(84)90286-2
更新日期:1984-07-01 00:00:00
abstract::Inflammation induced by chronic exposure to ultraviolet (UV) radiation has been implicated in various skin diseases. We formulated the hypothesis that a high-fat diet may influence the UV-induced inflammatory responses in the skin. C57BL/6 mice were fed a high-fat diet or control diet and exposed to UVB radiation (120...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.09.003
更新日期:2009-12-15 00:00:00
abstract::Traditional predictive tests for dermal sensitization in humans use the albino guinea pig as a model. A number of factors make the prospect of an alternative attractive. Guinea pig designs are labor intensive, require significant animal, caging, and husbandry resources, and are expensive. Extensive development and val...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(86)90419-9
更新日期:1986-06-15 00:00:00
abstract::Primary mixed cultures of Sertoli and germ cells were prepared from testes of immature rats and their response to the known testicular toxicants ethylene glycol monomethyl ether (EGM) and ethylene glycol monoethyl ether (EGE) was studied. Neither EGM nor EGE produced any morphological evidence of toxicity when added t...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(85)90146-2
更新日期:1985-07-01 00:00:00
abstract::Along with hepatotoxicity, cardiotoxic side effects remain one of the major reasons for drug withdrawals and boxed warnings. Prediction methods for cardiotoxicity are insufficient. High content screening comprising of not only electrophysiological characterization but also cellular molecular alterations are expected t...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2011.02.008
更新日期:2011-04-15 00:00:00
abstract::There is conflicting evidence in the literature as to the predominant mechanism and also the compositional element(s) that drives the pulmonary inflammatory response of ambient particulate matter (PM). We have investigated the inflammogenic potential of coarse (2.5-10 microm) and fine (<2.5 microm) PM from both a rura...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2003.10.002
更新日期:2004-02-15 00:00:00
abstract::The effect of HgCl2 on kainate (KA)-induced depression of voltage-gated potassium (K+) current in chick embryo telencephalic cells was studied using conventional and nystatin-perforated whole-cell patch-clamp recordings, fluorescence imaging, and flow cytometry techniques. Hg2+ (1 microM) alone did not effect the 4-am...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1996.0127
更新日期:1996-06-01 00:00:00
abstract::Doxorubicin (DOX) is a potent anti-neoplastic antibiotic used to treat a variety of malignancies; however, its use is limited by dose-dependent cardiotoxicity. Moreover, there is a strong correlation between cytochrome P450 (CYP)-mediated arachidonic acid metabolites and the pathogenesis of many cardiovascular disease...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.09.012
更新日期:2010-01-01 00:00:00
abstract::The disposition of polycyclic aromatic hydrocarbons (PAHs) in the respiratory tract of the Beagle dog was measured and presented in two previous papers. In this paper, the data were used to demonstrate that highly lipophilic toxicants, such as PAHs, were diffusion-limited during clearance from the respiratory tract. O...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1993.1161
更新日期:1993-08-01 00:00:00
abstract::The ability of brain tissue preparation to generate superoxide from xenobiotic interactions has been investigated. We showed that a significant superoxide production occurred with different molecules known to undergo a single electron reductive pathway of metabolism, both in a homogenate derived from neuronal and glia...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(91)90294-o
更新日期:1991-08-01 00:00:00
abstract::The cardiotoxicity caused by doxorubicin and extravasation injury caused by anthracyclines is reduced by the clinically approved bisdioxopiperazine drug dexrazoxane. Dexrazoxane is a rings-closed analog of EDTA and is hydrolyzed in vivo to a form that strongly binds iron. Its protective effects were originally thought...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2020.115038
更新日期:2020-07-15 00:00:00
abstract::The M2 subtype of muscarinic receptor is predominant in heart, and such receptors were reported to be located in muscles as well as in presynaptic cholinergic and adrenergic nerve terminals. Muscarinic receptors of rat heart were identified by the high affinity binding of the agonist (+)-[3H]cis-methyldioxolane ([3H]C...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(90)90320-t
更新日期:1990-05-01 00:00:00
abstract::Ethambutol, an efficacious antituberculosis agent, can cause irreversible visual loss in a small but significant fraction of patients. However, the mechanism of ocular toxicity remains to be established. We previously reported that ethambutol caused severe vacuole formation in cultured retinal cells, and that the addi...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2008.11.006
更新日期:2009-03-01 00:00:00
abstract::Cadmium chloride (CdCl2) at a dose of 1 mg/kg of body weight was injected into male Wistar rats twice a day (12-hr intervals) for 7 consecutive days. A group of treated rats was maintained without any treatment for an additional period of 10 days and killed on the following day (on Day 18). Plasma aldosterone concentr...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(84)90346-6
更新日期:1984-12-01 00:00:00
abstract::Thymic lymphoma/leukemia is the major cause of death in B6C3F1 mice chronically exposed to 1,3-butadiene (BD). Similar to radiation-induced murine thymic lymphoma, the bone marrow is also a major target organ. Because of the association of murine thymic lymphoma with endogenous type-C murine leukemia retroviruses (MuL...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(86)90352-2
更新日期:1986-09-30 00:00:00
abstract::Gene 33 (Mig6, ERRFI1) is an adaptor protein with multiple cellular functions. We recently reported that depletion of this protein promotes lung epithelial cell transformation induced by hexavalent chromium [Cr(VI)]. However, the early molecular events that mediate this process are not clear. In the present study, we ...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2017.07.003
更新日期:2017-09-01 00:00:00
abstract:BACKGROUND:Atmospheric ultrafine particles (UFPs) and pesticide rotenone were considered as potential environmental risk factors for Parkinson's disease (PD). However, whether and how UFPs alone and in combination with rotenone affect the pathogenesis of PD remains largely unknown. METHODS:Ultrafine carbon black (ufCB...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2017.03.005
更新日期:2017-05-01 00:00:00
abstract::Mycotoxin citrinin (CTN) is commonly found in foods and feeds that are contaminated/inoculated with Penicillium, Aspergillus and Monascus species. The exposure of human embryonic kidney (HEK293) and HeLa cells to CTN resulted in a dose-dependent increase in the phosphorylation of two major mitogen-activated protein ki...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.03.021
更新日期:2009-06-15 00:00:00
abstract::The goodness of fit of three PBPK models to data for inhalation uptake of 1,3-butadiene by mice from closed chambers were compared. These models included a classical flow-limited model with blood consolidated into arterial and venous compartments, a flow-limited model with implicit blood and alveolar compartments, and...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1997.8289
更新日期:1997-12-01 00:00:00