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Bisphenol A is affecting us at much lower doses than previously thought
Date:11/7/2013

Bisphenol A (BPA) is a known endocrine disruptor that hijacks the normal responses of hormones. Yet, traditional toxicology studies indicate that only very high doses of this chemical affect exposed animalsdoses as high as 50 mg/kg/day. For the past decade, scientists have used modern scientific techniques to probe the effects of BPA on numerous endpoints that are not examined in those traditional toxicology studies. Examining these non-traditional endpoints reveal a very different story. Because of increased understanding of the mechanisms by which hormones and chemicals that mimic hormones work, it has recently become clear that endocrine disruptors need to be studied at much lower doses.

As a consequence of this new understanding, a group of scientists that study endocrine disruption worked together to update and refine a 2007 review of the low dose effects of BPA. The group not only added hundreds of more recent studies, but they also used an integrative biological approach to scrutinize low dose effects of BPA at multiple levels of biological organization: on cells, animals and human populations.

The findings are striking. When looking at the "low dose" literature as a whole, reproducible effects were seen in animals after exposure to incredibly low doses of BPA. In fact, effective doses were ten to forty times lower than the doses identified in traditional toxicology studies. Several dozen "low dose" studies show effects of BPA at doses that humans are thought to encounter in their everyday lives.

These scientists detail in their article the effects of BPA exposure both in vitro and in vivo, and how it contributes to a large range of health problems in humans, such as polycystic ovarian syndrome, immune response to allergens, behavioral problems and decreased fertility. The effects on wildlife are also widespread.

With the knowledge that such tiny amounts of BPA can have such far-reaching implications for humans and wildlife, stricter regulations of this chemical and other endocrine disruptors should be fast on its heels.


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Contact: Andrew Thompson
andrew@landesbioscience.com
Landes Bioscience
Source:Eurekalert

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