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Xenobiotica
the fate of foreign compounds in biological systems
Volume 49, 2019 - Issue 5
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General Xenobiochemistry

Bisphenol S modulates concentrations of bisphenol A and oestradiol in female and male mice

ORCID Icon, , , & ORCID Icon
Pages 540-548 | Received 07 Apr 2018, Accepted 22 May 2018, Published online: 08 Jun 2018
 

Abstract

  1. Concern over endocrine-disrupting actions of bisphenol A (BPA) has prompted some manufacturers to remove it from consumer products. Among the chemical replacements in “BPA-free” products are other bisphenol analogues, such as bisphenol S (BPS). Given evidence that BPA and BPS possess similar oestrogenic activity, their capacity to interact and disrupt oestrogen homeostasis should be examined.

  2. We investigated whether BPS can modulate concentrations of 14C-BPA, exogenous 3H-oestradiol (E2), or natural E2. CF-1 mice were each given a single subcutaneous injection of oil containing 0 (vehicle), 1, 3, or 9 mg BPS, then given a dietary supplement containing either 50 μg/kg 14C-BPA or 5 μCi (14.5 ng) 3H-E2. BPS treatment elevated 14C-BPA concentrations in blood serum and certain reproductive organs of both sexes, but reduced 3H-E2 concentrations in blood serum of females. In another experiment, natural E2 was measured in urine 2–12 h after injection of 0 (vehicle), 1, or 3 mg BPS. BPS reduced E2 concentrations at 10 h after injection in both sexes.

  3. These results are consistent with evidence that BPS and BPA compete for access to metabolic enzymes, and that BPS can disrupt oestrogen homeostasis. These findings demonstrate the importance of considering multiple toxicants when determining regulatory exposure limits.

Funding

This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada awarded to D. deCatanzaro [RGPIN/03649-2015, EQPEQ/390407-2010].

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