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In utero exposure to diesel exhaust a possible risk factor for obesity
Date:7/19/2012

Bethesda, MDPregnant mice exposed to high levels of air pollution gave birth to offspring with a significantly higher rate of obesity and insulin resistance in adulthood than those that were not exposed to air pollution. This effect seemed especially prevalent in male mice, which were heavier regardless of diet. These findings, published online in the FASEB Journal, suggests a link between diesel exhaust exposure in utero and bulging waistlines in adulthood.

"It is becoming clearer that our environment profoundly affects our health in ways that are little understood," said Jessica L. Bolton, Ph.D., a researcher involved in the work from the Department of Psychology and Neuroscience at Duke University in Durham, NC. "We believe these data have important implications for health disparities as a consequence of socioeconomic conditions, in which low income neighborhoods tend to be disproportionately exposed to high levels of pollution, which we hope will inform policy and regulation decisions."

To make this discovery, Bolton and colleagues used two groups of pregnant female mice, one of which was exposed to diesel exhaust during the latter half of pregnancy. The second group was exposed to filtered air for the same time period. The mice lived in specialized chambers for four hours each day breathing polluted air and then were returned to normal housing after these exposures. Prior to birth, some of the fetal brains of the mice from both groups were analyzed to measure immune proteins and to get a "snap shot" of the fetal brain immune response to the in utero condition. Once the offspring were adults, they were placed on either a low-fat diet (10% saturated fat) or a high-fat diet (45% saturated fat). All other nutritional aspects of the diets were identical. Scientists measured food intake, body weight and activity levels before putting the mice on their diets, and then weekly throughou
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Contact: Cody Mooneyhan
cmooneyhan@faseb.org
301-634-7104
Federation of American Societies for Experimental Biology
Source:Eurekalert

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