Harvard Researchers Identify Gut Bacteria Molecule That May Trigger Depression
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Scientists at Harvard Medical School have discovered a specific biological mechanism linking a gut bacterium to depression. They found that an environmental contaminant can alter a molecule produced by the bacterium Morganella morganii, turning it into a substance that triggers inflammatory proteins associated with the disorder. This molecule may serve as a target for diagnosing or treating certain cases of depression.
Facts First
- Harvard researchers identified a molecule produced by gut bacterium Morganella morganii that may trigger inflammation linked to depression.
- An environmental contaminant, diethanolamine (DEA), can alter this molecule, causing it to behave like a known inflammation-triggering substance.
- The altered molecule prompts the release of interleukin-6 (IL-6), an inflammatory protein previously linked to depression.
- Chronic inflammation is associated with major depressive disorder, and Morganella morganii has also been linked to inflammatory bowel disease and type 2 diabetes.
- The study was funded by the National Institutes of Health and The Leona M. and Harry B. Helmsley Charitable Trust and published in the Journal of the American Chemical Society.
What Happened
Researchers at Harvard Medical School (HMS) have identified a biological mechanism showing how the gut bacterium Morganella morganii (M. morganii) may affect brain health. The study found that an environmental contaminant, diethanolamine (DEA), can replace a component in a molecule produced by M. morganii in the gut. This altered molecule then activates the immune system and prompts the release of inflammatory cytokines, specifically interleukin-6 (IL-6). Chronic inflammation is associated with major depressive disorder, and IL-6 has been previously linked to depression.
Why this Matters to You
This research may lead to new diagnostic tools or treatments for depression by targeting this specific inflammatory molecule. If you or someone you know suffers from depression, this discovery opens a potential new avenue for understanding the condition's biological roots, which could eventually complement existing therapies. The finding also highlights a possible link between common environmental contaminants in industrial, agricultural, and consumer products and a pathway to inflammation affecting mental health.
What's Next
The identified inflammation-triggering molecule may serve as a target for future research into diagnosing or treating certain cases of depression. The Clardy Lab at HMS, which focuses on the chemistry of small molecules produced by bacteria, and collaborators like Ramnik Xavier at the Broad Institute of MIT and Harvard, are likely to continue exploring how bacterial molecules influence health. Their previous work has shown other gut bacteria produce molecules that either protect against inflammation or trigger it in diseases like Crohn's disease, suggesting this field of research is actively expanding.