Alzheimer’s risk may start at the brain’s border, not inside it Your brain has its own elite defense team — and new research shows these "guardian" cells might be the real battleground for neurological diseases like Alzheimer’s and stroke. Scientists discovered that most genetic risks linked to these diseases act not in neurons, but in the blood vessels and immune cells that form the blood-brain barrier.
https://www.sciencedaily.com/r....eleases/2025/08/2508