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Over the last few years, increasing evidence has become available that some chemicals may have thyroid hormone‐disrupting potencies. The effects exerted via thyroid hormone receptors (TR) have not been studied thoroughly. The present study investigates chemical thyroid hormone disruption at the level of TR functioning. To this end the (ant)agonistic action of a series of xenobiotics was tested in the newly developed yeast two‐hybrid assay. This assay makes use of recombined TRβ gene and reporter gene yeast, which specifically expresses β‐galactosidase when incubated with exogenous 3,3′,5‐triiodo‐L‐thyronine (T3). Agonistic and antagonistic actions were studied in the absence and presence of 5 × 10−6 mol/L T3, which induced maximal β‐galactosidase activity. The compounds tested included the specific TR‐antagonist amiodarone, as well as a series of phenols, phthalate, organochlorine pesticides (OCPs), polyhalogenated aromatic hydrocarbons (PHAHs) with structural similarity to T3, and 3,3′,5,5′‐tetraiodo‐L‐thyronine (T4). The results obtained reveal that only 2‐t‐butylphenol and 2‐isopropylphenol are specific agonists. Interestingly, some compounds showed potentiated antagonistic effects when tested in combination with T3, which suggests that TR‐mediated transcription may be disrupted in vivo. The 20% relative inhibitory concentration (RIC20) values of phenols, ester and OCPs were more than 10−7 mol/L, but the values for PHAHs with metabolization were lower than 5 × 10∼7 g/L. These results suggest that PHAHs pose a serious threat to the human thyroid system. Altogether the results of the present study show that the newly developed, yeast two‐hybrid assay can be used as a valuable tool for identification and quantification of compounds active in disturbing thyroid hormone homeostasis at the level of TR. The results are further evidence of thyroid‐related effects of environmentally relevant PHAHs.
Environmental Toxicology & Chemistry – Wiley
Published: Jan 1, 2008
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