Scientists discover a hidden brain shift that begins around age 50
A study has identified a significant shift in the immune environment of the hippocampus starting around age 50, where brain immune cells called microglia are replaced by cells with inflammatory traits. This discovery may provide new clues into the mechanisms of aging and the development of neurodegenerative diseases.
Why it matters
Identifying the biological triggers of brain aging is essential for developing future treatments for dementia and other age-related cognitive decline.
A study funded by the National Institutes of Health (NIH) has uncovered a major shift in the immune environment of the hippocampus, the part of the brain that plays a central role in learning and memory. The findings suggest that this immune remodeling begins in midlife and may help explain how aging contributes to the long lasting brain inflammation often seen in neurodegenerative diseases.
"Aging is the single largest risk factor for dementia, but our understanding of how it drives disease is still incomplete," said Richard Hodes, M.D., director of NIH's National Institute on Aging (NIA). "This previously hidden microglial shift, now uncovered by innovations in technology and thinking, may be an important clue to help us complete the puzzle."
Brain Immune Cells Begin Changing in Midlife
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