Lymph Node Immune Signals, Not Tau Tangles, May Drive Alzheimer's Brain Damage
Researchers at Washington University in St. Louis have identified a peripheral immune mechanism that may explain why the body fails to heal Alzheimer's-related brain damage. Published in Nature Neuroscience, the study shows that dendritic cells in lymph nodes, not the brain itself, activate T cells that migrate to the brain and cause neurodegeneration. In mouse models, blocking these lymph node signals protected neurons and preserved cognition, even when toxic tau protein tangles remained in the brain. This suggests future treatments could target the immune system outside the blood-brain barrier, bypassing a major obstacle in drug delivery.
