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Female mice exposed to BPA by mothers show unexpected characteristics
Date:1/24/2013

ANN ARBORFemale mice exposed to Bisphenol A through their mother's diet during gestation and lactation were found to be hyperactive, exhibit spontaneous activity and had leaner body mass than those not exposed to the chemical, researchers at the University of Michigan School of Public Health have discovered.

BPA is a chemical most commonly found in the lining of food cans and cash register receipts. It once was in many hard plastic bottles, including baby bottles, but many companies have removed it as concerns about exposure have come to light in recent years.

These latest findings from U-M researchers seem to contradict previous studies on BPA that found the chemical to be a factor in obesity. But Dana Dolinoy, the John G. Searle Assistant Professor of Environmental Health Sciences and senior/corresponding author of the study, says research shows that many factors impact how the body reacts to the chemical.

"Our hypothesis going into this study was that BPA would act as an obesogenic agent. And there is some preliminary evidence that it does," Dolinoy said. "But there are differences in exposure, duration and when you actually measure the individual.

"Recent evidence in humans only looks at one time point. What we're really interested in is BPA exposure during early development, and how that affects health throughout life. So those are two very different questions."

The researchers exposed mothers to three different levels of BPA in the diet then followed the offspring through adulthood at three, six and nine months of age. The average lifespan of a mouse is two years, so by three months they are young adults.

"We looked at several different metabolic phenotypes, including spontaneous activity, food intake, energy expenditure and body composition. I think the most striking result we saw was the increased activity in these animals," said Olivia Anderson, doctoral student in environmental health science
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Contact: Laurel Thomas Gnagey
ltgnagey@umich.edu
734-647-1841
University of Michigan
Source:Eurekalert

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