Overview
- The study published March 5 in Cell Press Blue shows that tanycytes move tau from cerebrospinal fluid into pituitary portal capillaries and onward to the bloodstream.
- In mice, blocking tanycytic vesicular transport reduced CSF-to-blood tau efflux and increased tau accumulation in the brain.
- CSF and plasma from 86 people with Alzheimer’s and 91 controls revealed lower plasma-to-CSF ratios of total tau and p‑tau181 in the disease group.
- Postmortem analyses found severely fragmented tanycyte processes in Alzheimer’s brains along with vesicular-transport gene alterations by single-nucleus RNA sequencing.
- Researchers cite potential therapeutic and biomarker implications tied to preserving tanycyte function, with cautions about modest cohorts, model limitations, and the need for longitudinal validation.