Stephanie K. Meyer
Environmental xenoestrogens super-activate a variant murine ER beta in cholangiocytes
Meyer, Stephanie K.; Probert, Philip M.E.; Lakey, Anne K.; Leitch, Alastair C.; Blake, Lynsay I.; Jowsey, Paul A.; Cooke, Martin P.; Blain, Peter G.; Wright, Matthew C.
Authors
Philip M.E. Probert
Anne K. Lakey
Alastair C. Leitch
Lynsay I. Blake
Paul A. Jowsey
Martin P. Cooke
Peter G. Blain
Matthew C. Wright
Abstract
High systemic levels of oestrogens are cholestatic and primary biliary cholangitis (PBC)—which is characterized by hepatic ductular inflammation—is thought to be triggered by exposure to xenobiotics such as those around landfill sites. Xenoestrogens may be a component of this chemical trigger. We therefore hypothesized that xenoestrogens are present at higher levels in the proximity of landfill sites. To test this hypothesis, soil samples were collected, extracts prepared and biological oestrogenic activity examined using cell-based reporter gene assays. Extracts from several sample sites around a landfill site contained a chemical(s) which activated the human ERα in a dose-dependent manner. Extracts from 3 separate control sampling sites were absent of any detectable activity. The mouse ERα and 2 variant mouse ERβ cDNAs were cloned and extracts from sample sites around a landfill site also activated these receptors. One variant murine ERβ was constitutively active when expressed in cholangiocytes, was readily inactivated by ICI182780 and activated in a dose-responsive, ICI182780-inhibitable manner by oestrogen. However, when this receptor was activated by extracts from landfill site soils, ICI182780 failed to antagonize activation. ERβ was readily detectable in murine cholangiocytes and exposing mice acutely to a pooled ER activating soil extracts also gave rise to a mild cholestatic injury. These data indicate that the environment around landfill sites may contain higher levels of xenoestrogens; that these chemicals have “super-activating” characteristics with a variant ERβ and therefore these chemicals could be a component of a xenobiotic insult that triggers PBC.
Citation
Meyer, S. K., Probert, P. M., Lakey, A. K., Leitch, A. C., Blake, L. I., Jowsey, P. A., …Wright, M. C. (2017). Environmental xenoestrogens super-activate a variant murine ER beta in cholangiocytes. Toxicological Sciences, 156(1), 54-71. https://doi.org/10.1093/toxsci/kfw234
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 10, 2016 |
Online Publication Date | Dec 24, 2016 |
Publication Date | Mar 1, 2017 |
Deposit Date | Aug 8, 2018 |
Publicly Available Date | Aug 9, 2018 |
Journal | Toxicological Sciences |
Print ISSN | 1096-6080 |
Electronic ISSN | 1096-0929 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 156 |
Issue | 1 |
Pages | 54-71 |
DOI | https://doi.org/10.1093/toxsci/kfw234 |
Related Public URLs | https://eprint.ncl.ac.uk/233449 |
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Copyright Statement
© The Author 2016. Published by Oxford University Press on behalf of the Society of Toxicology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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