Scientists Identify Gut Bacteria That Produce Serotonin, Opening New Path for IBS Treatment

Researchers have identified two species of gut bacteria capable of producing serotonin, a neurotransmitter that plays a critical role in regulating bowel movements. The discovery could reshape how irritable bowel syndrome and other gastrointestinal disorders are understood and treated.

What the Research Found

The study demonstrated that specific gut microbes can directly synthesize serotonin, which was previously thought to be produced primarily by specialized cells in the gut lining. In experiments with mice, introducing these bacteria boosted serotonin levels in the colon and increased the number of nerve cells in the intestinal wall.

This is significant because roughly 95 percent of the body's serotonin is found in the gut, where it regulates motility, the rhythmic contractions that move food through the digestive system. Disruptions in gut serotonin signaling are implicated in conditions like irritable bowel syndrome, which affects an estimated 10 to 15 percent of the global population.

Why It Matters

Current IBS treatments often target symptoms rather than underlying mechanisms. If gut bacteria can be shown to reliably modulate serotonin production in humans, it opens the possibility of probiotic-based therapies that address the root biochemistry of the condition rather than just managing discomfort.

The findings also add to the growing body of evidence connecting the gut microbiome to neurological and psychological health. Serotonin is best known for its role in mood regulation, and the gut-brain axis, the bidirectional communication pathway between the digestive system and the brain, is increasingly recognized as central to both mental and physical health.

Key Takeaways

- Two gut bacteria species were found to produce serotonin directly in the colon.
- Mouse experiments showed increased serotonin levels and intestinal nerve cell growth.
- The discovery could lead to probiotic-based treatments for IBS and related conditions.
- About 95 percent of the body's serotonin is produced in the gut, not the brain.

Original source: ScienceDaily

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