New probiotic may help combat negative health effects of adrenaline surges

U.S. sailors and Marines face continuous periods of excessive stress in "fight-or-flight" situations, triggering surges of chemical messengers called neurotransmitters, often known as an adrenaline rush. While these surges are important for relaying messages in the brain, prolonged high levels can cause long-term health problems, including anxiety and susceptibility to infection.

Imagine if a naval officer and other members of the Navy could swallow a probiotic pill or yogurt to better protect them from the effects of these surges.

Tae Seok Moon, an engineer in the School of Engineering & Applied Science at Washington University in St. Louis, is working to create a probiotic from a commercially-available, beneficial bacterial strain of Escherichia coli after receiving a three-year, $508,635 grant from the Office of Naval Research's 2017 Young Investigator Program. The nationwide award was one of 33 given to early-career engineers and scientists from more than 360 applicants.

Moon, assistant professor of energy, environmental and chemical engineering, specializes in building synthetic gene circuits to control and improve cellular process for human-defined functions. For this project, he will change the genes of E. coli Nissle 1917, then provide it as a probiotic supplement to mice to regulate the neurotransmitters in the brain and gut — better protecting model mice from the harmful effects of long-term exposure.

The human gut hosts a community of more than 100 trillion microbial cells that influence physiology, metabolism, nutrition and immune function. Previous studies by other researchers have shown the gut microbiota may influence the brain neurotransmitter systems, development of emotional behavior and stress- and pain-modulation systems. Probiotics are live microorganisms intended to have health benefits and are often given as supplements to treat digestive, allergic and other disorders.

"We tend to think the gut and the brain are separate, but recently, more researchers think they are connected through the microbiota-gut-brain axis," he said. "Because I'm an engineer, I asked how I could make probiotic bacteria that could be applied to this concept and deepen understanding of that connection."

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