Development of a Human Estrogen Receptor Dimerization Assay for the Estrogenic Endocrine-Disrupting Chemicals Using Bioluminescence Resonance Energy Transfer

Abstract

Endocrine-disrupting chemicals (EDCs) are found in food and various other substances, including pesticides and plastics. EDCs are easily absorbed into the body and have the ability to mimic or block hormone function. The radioligand binding assay based on the estrogen receptors binding affinity is widely used to detect estrogenic EDCs but is limited to radioactive substances and requires specific conditions. As an alternative, we developed a human cell-based dimerization assay for detecting EDC-mediated ER-alpha (ER alpha) dimerization using bioluminescence resonance energy transfer (BRET). The resultant novel BRET-based on the ER alpha dimerization assay was used to identify the binding affinity of 17 beta-estradiol (E2), 17 alpha-estradiol, corticosterone, diethylhexyl phthalate, bisphenol A, and 4-nonylphenol with ER alpha by measuring the corresponding BRET signals. Consequently, the BRET signals from five chemicals except corticosterone showed a dose-dependent sigmoidal curve for ER alpha, and these chemicals were suggested as positive chemicals for ER alpha. In contrast, corticosterone, which induced a BRET signal comparable to that of the vehicle control, was suggested as a negative chemical for ER alpha. Therefore, these results were consistent with the results of the existing binding assay for ER alpha and suggested that a novel BRET system can provide information about EDCs-mediated dimerization to ER alpha.