Environmental health and toxicology

In vitro thyroid disrupting e ects of organic extracts from WWTPs in Beijing


Na Li , Mei Ma , Kaifeng Rao , Zijian Wang

DOI:

Received May 25, 2010,Revised September 03, 2010, Accepted , Available online

Volume 23,2011,Pages 671-675

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It is generally known that there are many endocrine disrupting compounds (EDCs) in the e uents from wastewater treatment plants (WWTPs). Most research has focused on the occurrence of estrogenic or androgenic activities, while ignoring that there are environmental chemicals disrupting thyroid system, which is essential for growth and development in both humans and animals. In the present work, a two-hybrid yeast assay was conducted to evaluate the removal e ciencies of agonistic or antagonistic thyroid receptor (TR) mediated e ects in di erent treatment processes of three WWTPs located in Beijing. We found no TR agonistic, but TR antagonistic activities in all processes from the WWTPs. The TR antagonistic activities in organic extracts of water samples were then calibrated regarding to a known TR-inhibitor, amiodarone hydrochloride (AH). The observed concentration of TR disrupting substances ranged from 2.35 10??8 to 6.19 10??7 mol/L AH in Gaobeidian WWTP, 3.76 10??8 to 8.75 10??8 mol/L AH in Lugouqiao WWTP, and 4.80 10??9 to 2.55 10??8 mol/L AH in Beixiaohe WWTP. Of the three WWTPs, the removal rates were 92.7%, 42.2%, and 23.1% respectively. Industrial sewage may contain more TR disrupting substances compared with domestic sewage. The recipient waters were found to contain considerable concentrations of TR disrupting substances that may cause adverse e ects on the exposed organisms.

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