Harvard scientists link gut bacteria to depression through hidden inflammation trigger

Harvard study reveals how gut bacterium Morganella morganii and a common pollutant may trigger depression-linked inflammation, opening new treatment avenues. | Contesto: cronaca

Punti chiave

• Harvard scientists link gut bacteria to depression through hidden inflammation trigger

Contesto

A new study from Harvard scientists has uncovered a surprising link between a common gut bacterium and depression, suggesting that an environmental pollutant may play a key role in triggering the mood disorder through inflammation. Researchers found that the bacterium Morganella morganii, when exposed to a widely present pollutant, produces a molecule that sparks an inflammatory response—a process strongly associated with depression. The discovery, published recently, offers a molecular explanation for how gut microbes can influence brain health and points toward potential treatments that target the immune system rather than the brain itself. The study focused on Morganella morganii, a bacterium often found in the human gut, and its interaction with a common environmental pollutant. The team observed that this combination leads to the production of a specific molecule that activates inflammation, a biological response linked to numerous health conditions, including major depressive disorder. This finding is significant because it provides a direct mechanism linking gut bacteria to depression, moving beyond correlation to a plausible causal pathway. The inflammation trigger appears to be a chemical twist that researchers had not previously identified, highlighting the complexity of the gut-brain axis. Depression affects millions worldwide, and current treatments primarily target brain chemistry, such as serotonin levels, with mixed success. The Harvard findings suggest that for some individuals, depression may stem from inflammation originating in the gut, which could explain why standard antidepressants fail for many patients. By identifying the molecular culprit, the study opens the door to therapies that block the inflammatory response or alter the gut environment to prevent the bacterium from producing the harmful molecule. This represents a paradigm shift from a brain-centric view of depression to one that considers the immune system and gut health as central players. The implications extend beyond depression, as inflammation is implicated in a range of mental and physical health issues, including anxiety, chronic fatigue, and autoimmune diseases. The study...

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Categoria: cronaca