4.4 Article

Strain specific induction of pyometra and differences in immune responsiveness in mice exposed to 17α-ethinyl estradiol or the endocrine disrupting chemical bisphenol A

Journal

REPRODUCTIVE TOXICOLOGY
Volume 34, Issue 1, Pages 22-30

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.reprotox.2012.03.001

Keywords

Bisphenol A; Macrophage; Pyometra; Uterus; Mouse; Estrogen; Endocrine disruptor; Immune response

Funding

  1. National Institute of Health [R01 ES015145, RC2 ES018765, T32 ES016646]
  2. University of Cincinnati Center for Environmental Genetics [P30-ES06096]

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Pyometra is an inflammatory disease of the uterus that can be caused by chronic exposure to estrogens. It is unknown whether weakly estrogenic endocrine disruptors can cause pyometra. We investigated whether dietary exposures to the estrogenic endocrine disruptor bisphenol A (SPA) induced pyometra. Pyometra did not occur in CD1 mice exposed to different dietary doses of BPA ranging from 4.1 to >4000 mu g/kg-d or 17 alpha-ethinyl estradiol (EE; 1.2 to >150 mu g/kg-d). In the C578L/6 strain, pyometra occurred in the 15 mu g/kg-d EE and 33 mu g/kg-d BPA treatment groups. At the effective concentration of SPA, histological analysis revealed pathological alterations of uterine morphology associated with a >5.3-fold increase in macrophage numbers in non-pyometra uteri of C57BL/6 mice exposed to SPA. These results suggest that BPA enhances immune responsiveness of the uterus and that heightened responsiveness in C57BL/6 females is related to increased susceptibility to pyometra. (C) 2012 Elsevier Inc. All rights reserved.

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