谢晴
Senior Engineer
Gender:Female
Alma Mater:大连理工大学
Degree:Doctoral Degree
School/Department:环境学院
Discipline:Environmental Engineering
Business Address:环境楼A315
E-Mail:qingxie@dlut.edu.cn
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Indexed by:期刊论文
Date of Publication:2011-06-01
Journal:TOXICOLOGICAL SCIENCES
Included Journals:Scopus、SCIE、PubMed
Volume:121
Issue:2
Page Number:279-291
ISSN No.:1096-6080
Key Words:PFOS; BDE-47; developmental neurotoxicity; TR beta; BTEB; BDNF; GAP-43; NCAM1; thyroid hormone; TH-mediated transcription; combined toxicity
Abstract:Perfluorooctane sulfonate (PFOS) and 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) are two persistent environmental contaminants that are toxic to developing nervous systems, particularly via their disruption of thyroid hormone (TH) function. To investigate whether an interaction existed between PFOS and BDE-47 on TH-mediated pathways, adult female Wistar rats were exposed to 3.2 and 32 mg/kg of PFOS or BDE-47 in their diet and co-exposed to a combination of each chemical (3.2 mg/kg) from gestational day 1 to postnatal day (PND) 14. Serum and brain tissues from both male and female neonates were collected on PNDs 1, 7, and 14 to examine TH-regulated gene and protein expression. The results revealed that (1) a significant accumulation difference occurred between the two chemicals; (2) On a equimolar basis, BDE-47 and PFOS affected serum total triiodothyronine and total thyroxine differently in adults and offspring; (3) there were region-specific and exposure- and time-dependent alterations in TH concentrations and tested gene and protein expression levels; and (4) interaction for the combined chemicals was only observed for brain-derived neurotrophic factor (BDNF), which exhibited a synergistic effect on PND 1 in the cortex and an antagonistic effect on PND 14 in the hippocampus. Our results suggest a complex TH-mediated gene and protein response to BDE-47 and/or PFOS exposure that seems little related to TH homeostasis and that little combined interaction of co-exposures was observed except on BDNF. The underlying mechanisms remain uncertain but seem to involve more actions than just TH-regulated pathway.