A new study shows that long-lasting brain inflammation could directly harm memory and speed up diseases like Alzheimer’s and Parkinson’s. French researchers found that an immune molecule called interleukin-1, or IL-1, can disrupt the brain’s ability to form and store memories when levels stay elevated over time.
To study this, scientists infected mice with Toxoplasma Gondii, a parasite that causes chronic brain inflammation. The mice developed major memory issues, similar to those seen in neurodegenerative diseases. But when researchers blocked the effects of IL-1 in the memory center of the brain, the mice regained normal memory function.
Experts say the findings open the door to new treatments that focus on reducing inflammation rather than targeting neurons directly. Since IL-1 levels rise in many chronic conditions — including infections, autoimmune disorders, and depression — this discovery could lead to broader solutions for protecting memory and slowing brain decline.
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