Abstract:
:Numerous experiments have shown that the aromatic solvents can affect the auditory system in the rat, the cochlea being targeted first. Solvents differ in cochleotoxic potency: for example, styrene is more ototoxic than toluene or xylenes. The goal of this study was to determine the relative ototoxicity of the three isomers of xylene (o-, m- or p-xylene). Moreover, by dosing with the two urinary metabolites of xylene, methylhippuric (MHAs) and mercapturic acids (MBAs), this study points toward a causal relationship between the cochleotoxic effects and potential reactive intermediates arising from the biotransformation of the parent molecules. Separate groups of rats were exposed by inhalation to one isomer following this schedule: 1800 ppm, 6 h/d, 5 d/wk for 3 wk. Auditory thresholds were determined with brainstem-auditory evoked potentials. Morphological analysis of the organ of Corti was performed by counting both sensory and spiral ganglion cells. Among the three isomers, only p-xylene was cochleotoxic. A 39-dB permanent threshold shift was obtained over the tested frequencies range from 8 to 20 kHz. Whereas outer hair cells were largely injured, no significant morphological change was observed within spiral ganglia. The concentrations of urinary p-, o- or m-MHA were greater (p-MHA: 33.2 g/g; o-MHA: 7.8 g/g; m-MHA: 20.4 g/g) than those obtained for MBAs (p-MBA: 0.04 g/g; o-MBA: 6.2 g/g; m-MBA: 0.03 g/g). Besides, there is a large difference between o-MBA (6.2 g/g) and p-MBA (0.04 g/g). As a result, since the cysteine conjugates are not determinant in the ototoxic process of xylenes, the location of the methyl groups around the benzene nucleus could play a key role.
journal_name
Neurotoxicol Teratoljournal_title
Neurotoxicology and teratologyauthors
Maguin K,Lataye R,Campo P,Cossec B,Burgart M,Waniusiow Ddoi
10.1016/j.ntt.2006.08.007subject
Has Abstractpub_date
2006-11-01 00:00:00pages
648-56issue
6eissn
0892-0362issn
1872-9738pii
S0892-0362(06)00091-2journal_volume
28pub_type
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journal_title:Neurotoxicology and teratology
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abstract::The postnatal behavioral effects of 0.20, 0.62 and 2.0 mg/kg cadmium chloride administered to pregnant CFY rats on gestational days 7 through 15 were evaluated. Offspring were tested starting on postnatal day 23 on a rotorod for motor coordination, in an open field device for motor activity and emotionality, in a wate...
journal_title:Neurotoxicology and teratology
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doi:10.1016/s0892-0362(98)00039-7
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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abstract::Methylphenidate (MPD) is a dopamine uptake inhibitor and the most commonly prescribed drug for the treatment of attention-deficit/hyperactivity disorder in children. Several studies have shown that such stimulants as cocaine and amphetamine that are administered during gestation and lactation may disrupt maternal beha...
journal_title:Neurotoxicology and teratology
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doi:10.1016/j.ntt.2015.05.008
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journal_title:Neurotoxicology and teratology
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更新日期:2009-05-01 00:00:00
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journal_title:Neurotoxicology and teratology
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doi:10.1016/j.ntt.2014.03.006
更新日期:2014-05-01 00:00:00
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journal_title:Neurotoxicology and teratology
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更新日期:1987-11-01 00:00:00
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journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2003.10.007
更新日期:2004-03-01 00:00:00
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journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/0892-0362(91)90015-o
更新日期:1991-03-01 00:00:00
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journal_title:Neurotoxicology and teratology
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更新日期:2016-01-01 00:00:00
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journal_title:Neurotoxicology and teratology
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更新日期:2000-01-01 00:00:00
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journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2013.12.006
更新日期:2014-01-01 00:00:00
abstract::To assess teratogenic effects of cocaine exposure and maternal psychological distress on birth outcomes, we conducted a longitudinal prospective study of 415 infants (218 cocaine-exposed--CE, 197 nonexposed--NE). Drug exposure was determined through a combination of maternal self-report, urine, and meconium screens. M...
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doi:10.1016/s0892-0362(01)00208-2
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journal_title:Neurotoxicology and teratology
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doi:10.1016/j.ntt.2011.09.009
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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更新日期:2002-05-01 00:00:00
abstract::The effects of administration by inhalation of metallic mercury vapour (Hg0) to pregnant rats, approximately corresponding to doses of 0.2 mg Hg0/kg/day (high dose) or 0.07 mg Hg0/kg/day (low dose), on the developmental and behavioural repertoire of the offspring were studied. Exposure occurred during days 11-14 plus ...
journal_title:Neurotoxicology and teratology
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journal_title:Neurotoxicology and teratology
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更新日期:2010-03-01 00:00:00
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journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2012.06.002
更新日期:2012-09-01 00:00:00
abstract:BACKGROUND:Prenatal tobacco exposure is a risk factor for the development of externalizing behaviors and is associated with several adverse health outcomes. Because pregnancy smoking is a complex behavior with both daily fluctuations and changes over the course of pregnancy, quantifying tobacco exposure is a significan...
journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2010.08.003
更新日期:2011-01-01 00:00:00
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journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2007.08.001
更新日期:2007-11-01 00:00:00
abstract::The effects of subchronic exposure to lanthanum on rats' physical and neurobehavioral development were investigated. Wistar rats were exposed to lanthanum through oral administration at 0, 0.1, 2, and 40 mg/kg concentrations from gestation day 0 through 5 months of age. Prior to weaning of the pups, physical parameter...
journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/j.ntt.2005.10.007
更新日期:2006-01-01 00:00:00
abstract::Pregnant C57BL/6 mice were chronically treated with 0, 4, 6, or 8 ppm of methylmercury chloride (MeHg) in drinking water during fetal and early postnatal development. Four behavioral functions were analyzed in female and male offspring between the age of 6 and 12 weeks: motor coordination learning on the rotarod; trai...
journal_title:Neurotoxicology and teratology
pub_type: 杂志文章
doi:10.1016/s0892-0362(03)00007-2
更新日期:2003-05-01 00:00:00
abstract::High exposure to toluene may cause optic neuropathy and retinopathy, both associated with dyschromatopsia. Another solvent, ethanol, is known to induce acute blue-yellow dyschromatopsia. This study investigated the acute effects of high doses of toluene on color vision. Eight male printshop workers were examined befor...
journal_title:Neurotoxicology and teratology
pub_type: 临床试验,杂志文章
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更新日期:1999-01-01 00:00:00