Microbiota and brain diseases

Researchers at the Institut Pasteur in Paris are investigating how the bacteria in the gut and nose might affect brain diseases like Alzheimer's, Parkinson's, and depression. They are exploring whether these microbes could contribute to cognitive decline or influence how antidepressants work.

Mouse studies show microbiota effects

In experiments with mice, scientists found that transplanting gut bacteria from elderly people with Alzheimer's caused memory decline faster than bacteria from healthy elderly individuals. This suggests that certain bacteria might influence cognitive decline, though the findings need confirmation in humans.

Nasal microbiota linked to Parkinson's

Another team at the Institut Pasteur is looking into how nasal bacteria might contribute to Parkinson's disease. Their research shows that transferring nasal bacteria from sick mice to healthy ones can trigger Parkinson's-like symptoms, indicating a potential link between nasal microbiota and the disease.

Microbiota and antidepressant effectiveness

The researchers also found that imbalances in gut bacteria can reduce the production of serotonin, a brain chemical important for mood. Restoring the microbiota in mice with depression-like symptoms made them more responsive to antidepressants, suggesting diet and lifestyle may influence treatment effectiveness.

Future research and treatments

While the findings are promising, the team emphasizes that these results must be validated in humans before new treatments can be developed. They are working with a company in Montpellier to explore long-term drug development aimed at slowing cognitive decline.