Some Brains Survive Alzheimer's Damage. Scientists Think They Know How
Summary
Scientists studied brain tissue from people with and without dementia to understand Alzheimer's disease. They found that brain immune cells called microglia change how they act during the disease, which may affect whether people develop memory loss and dementia.Key Facts
- Alzheimer’s is linked to buildup of proteins called amyloid plaques and tau tangles in the brain.
- Not everyone with these protein changes develops dementia.
- Researchers analyzed brain samples from people with dementia, healthy older adults, and very old people without cognitive decline.
- Microglia, the brain’s immune cells, act differently at different stages of Alzheimer’s.
- Early in the disease, microglia become inflammatory around amyloid plaques.
- Later, microglia shift to a different immune state that relates to tau buildup and brain damage.
- Some people who stay mentally sharp never progress to the later microglia state linked to dementia.
- Understanding microglia's role might help create treatments to prevent or delay dementia.
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