Nicotine while pregnant alters genes, study suggests

Metin Akay, John S. Dunn Endowed Chair Professor of Biomedical Engineering and department chair, and his research team noted that the dopamine neurons, in response to nicotine exposure during pregnancy, were significantly activated, allowing the release of unusually high levels of dopamine in the prefrontal cortex.

Active dopamine, known as the "feel good" hormone, might seem a good thing at first glance. It's a neurotransmitter that carries information between neurons and regulates emotional responses. It allows us to see rewards and encourages action that will lead to reward, but since it contributes to those feelings of pleasure and reward, it also plays a part in addiction.

"The impacted dopamine can result in babies being born addicted to nicotine, but once we understand which genes are altered, which gene regulator networks are altered and which gene pathways are altered, we can develop targeted medication that could eliminate addiction in offspring," said Akay.

Exposure to nicotine during pregnancy through maternal smoking or nicotine replacement therapy is associated with adverse birth outcomes as well as several cognitive and neurobehavioral deficits.

The Akay lab previously published work indicating that dopamine neurons in the VTA are very likely involved in nicotine addiction. Their current work speaks to the very nature of health itself, exploring how the dopamine of nicotine-exposed offspring alters gene expression, a fundamental building block of health. Many diseases are caused by a change in the DNA of a single gene.

Akay's team includes Renee F. Keller, Tina Kazemi, Andrei Dragomir and Yasemin M. Akay, assistant professor of biomedical engineering.