๐ง Starting in Your 50s, Blood Immune Cells Quietly Invade the Brain โ Here's Why
Stanford researchers discovered that large numbers of blood immune cells begin crossing the blood-brain barrier as early as middle age, where they can replace the brain's native immune cells with more inflammatory ones. The team confirmed this by tracing shared DNA mutations found in both blood samples and brain tissue โ a clever lineage-tracking trick. Published in Nature on July 30, 2026, this midlife immune shift may explain why normal aging sets the stage for Alzheimer's and other dementias. Could targeting this process be the key to slowing neurodegenerative disease?
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