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Binding of Estrogenic Compounds to Recombinant Estrogen Receptor- : Application to Environmental Analysis

By Pillon, Arnaud

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Book Id: WPLBN0000183382
Format Type: PDF eBook
File Size: 0.2 MB
Reproduction Date: 2005
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Title: Binding of Estrogenic Compounds to Recombinant Estrogen Receptor- : Application to Environmental Analysis  
Author: Pillon, Arnaud
Volume:
Language: English
Subject: Government publications, United Nations., United Nations. Office for Disarmament Affairs
Collections: Government Library Collection, Disarmament Documents
Historic
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Publisher: United Nations- Office for Disarmament Affairs (Unoda)

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Pillon, A. (n.d.). Binding of Estrogenic Compounds to Recombinant Estrogen Receptor- : Application to Environmental Analysis. Retrieved from http://www.worldebooklibrary.net/


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Government Reference Publication

Excerpt
Excerpt: Estrogenic activity in environmental samples could be mediated through a wide variety of compounds and by various mechanisms. High-affinity compounds for estrogen receptors (ERs), such as natural or synthetic estrogens, as well as low-affinity compounds such as alkylphenols, phthalates, and polychlorinated biphenyls are present in water and sediment samples. Furthermore, compounds such as polycyclic aromatic hydrocarbons, which do not bind ERs, modulate estrogen activity by means of the aryl hydrocarbon receptor (AhR). In order to characterize compounds that mediate estrogenic activity in river water and sediment samples, we developed a tool based on the ER-(Alpha) ligand-binding domain, which permitted us to estimate contaminating estrogenic compound affinities. We designed a simple transactivation assay in which compounds of high affinity were captured by limited amounts of recombinant ER-(Alpha) and whose capture led to a selective inhibition of transactivation. This approach allowed us to bring to light that water samples contain estrogenic compounds that display a high affinity for ERs but are present at low concentrations. In sediment samples, on the contrary, we showed that estrogenic compounds possess a low affinity and are present at high concentration. Finally, we used immobilized recombinant ER-(Alpha) to separate ligands for ER and AhR that are present in river sediments. Immobilized ER-(Alpha), which does not retain dioxin-like compounds, enabled us to isolate and concentrate ER ligands to facilitate their further analysis. Key words: aryl hydrocarbon receptor, bioluminescent cell lines, environmental samples, estrogen receptor, xenoestrogens.

 

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