Prenatal exposure to toxics risks delay of child’s brain development

By Grace van Deelen | Environmental Health News | February 18, 2022

Read the full article by Grace van Deelen (Environmental Health News)

"Everyday levels of a pregnant woman’s exposure to mixtures of endocrine-disrupting chemicals like bisphenol A (BPA), phthalates, and per- and polyfluoroalkyl substances (PFAS), put their child at an increased risk of delayed language development, according to new research.

Because hormones regulate much of human development, endocrine-disrupting chemicals—which disrupt hormone activity—can create developmental problems. In the study, published today in Science, researchers determined that more than half of the pregnant women studied were exposed to endocrine-disrupting chemicals at a level that raises concerns about their child’s development.

“It’s very disconcerting,” Barbara Demeneix, a professor at the National Museum of Natural History in Paris and an author on the study, told EHN.

Demeneix and her collaborators used data from more than 2,000 pregnant women from Sweden to identify a mixture of endocrine-disrupting chemicals that was associated with a subsequent delay in the child’s language development. They then exposed tadpoles, zebrafish, and brain organoids—small brain “prototypes” made of human stem cells—to the same mixture of chemicals that had been measured in those mothers’ blood. In all three organisms, they saw similar results: a disruption of the regulation of genes responsible for language development in children.

They concluded that 54% of the women had enough exposure to put their child at risk of a developmental delay. While that doesn’t mean that 54% of babies born will develop more slowly, it does show that more than half the women in the study had concerning levels of endocrine-disrupting chemicals in their blood."