A fascinating new study reveals a previously underappreciated pathway for tau clearance in the brain.

Researchers show that tanycytes—specialized hypothalamic glial cells—actively transport tau from cerebrospinal fluid into the bloodstream. In Alzheimer disease, these cells become fragmented and dysfunctional, impairing tau clearance and potentially accelerating neurodegeneration.

This work opens an intriguing avenue: could restoring tanycyte function enhance tau removal and slow Alzheimer progression?

A small cellular gatekeeper may hold an important clue in the battle against dementia.

Source: Sauvé F et al. Tanycytic degeneration impairs tau clearance and contributes to Alzheimer's disease pathology. Cell Press Blue, 2026.