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Citation
Tags
HERO ID
202451
Reference Type
Journal Article
Title
Metabolism and biochemical effects of 3,3',4,4'-tetrachlorobiphenyl in pregnant and fetal rats
Author(s)
Morse, DC; Wehler, EK; van De Pas, M; de Bie, A; van Bladeren, PJ; Brouwer, A
Year
1995
Is Peer Reviewed?
Yes
Journal
Chemico-Biological Interactions
ISSN:
0009-2797
EISSN:
1872-7786
Publisher
ELSEVIER SCI PUBL IRELAND LTD
Location
CLARE
Report Number
BIOSIS/95/14319
Volume
95
Issue
1-2
Page Numbers
41-56
Language
English
PMID
7697753
DOI
10.1016/0009-2797(94)03347-1
Web of Science Id
WOS:A1995QL91600004
Abstract
The metabolism and distribution of a single oral dose of 25 mumol 14C-labelled 3,3',4,4'-tetrachlorobiphenyl (14C-TCB) were investigated in pregnant female Wistar rats and their fetuses. TCB was administered on day 13 of gestation and the elimination was followed for 7 days. Non-pregnant rats were treated similarly for comparison. Fecal elimination of 14C-TCB derived radioactivity was significantly lower in pregnant rats than in non-pregnant rats. The major metabolite found in adult liver and plasma, placental tissue, whole fetuses and fetal plasma was 3,3',4',5-tetrachloro-4-biphenylol (4-OH-TCB). Tissue levels (liver, abdominal fat, skin, skeletal muscle, kidney and plasma) of 14C-TCB-derived radioactivity declined by 65-85% over a 7-day period following administration in the adult animals. However, 14C-TCB-derived radioactivity accumulated more than 100-fold in the fetuses over the same time period, and GC/MS analysis revealed that the fetal accumulation in radioactivity was due primarily to 4-OH-TCB, and not the parent compound. On day 20 of gestation, concentrations of 4-OH-TCB were 14 times greater in fetal plasma than maternal plasma. Treatment with 14C-TCB significantly reduced plasma thyroxine levels by at least 28% up to 7 days after administration in non-pregnant animals and up to 4 days after administration in pregnant rats (31% decrease). By 7 days after administration plasma thyroxine levels had returned to control levels in the TCB-treated pregnant rats. However, fetal plasma thyroxine levels were significantly decreased by 35% in fetuses from 14C-TCB-treated dams 7 days after TCB administration. Hepatic microsomal ethoxyresorufin-O-deethylase (EROD) activity was significantly induced in TCB-treated dams relative to controls at 4 and 7 days after administration, while no EROD activity was detected in hepatic microsomes from control or TCB treated fetal rats at day 20 of gestation. These data suggest that hydroxylated metabolites of polychlorinated biphenyls may play a role in the development toxicity of these compounds.
Keywords
Polychlorinated biphenyl; Metabolism; Pregnant rat; Fetus; Thyroxine; Hypothyroidism
Tags
IRIS
•
PCBs
Mechanistic
ADME and pharmacokinetic modeling
Supplemental
Litsearches
PubMed
WoS
ToxLine
Remaining
LitSearch August 2015
Pubmed
Toxline
WoS
Cited (Nov 2012)
Seed References
•
PCBs Tox Hazard ID
Administered mixture of < 4 individual PCB congeners
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