Hidden Brain Cells Offer New Hope for Alzheimer’s Treatment
Published on March 6, 2026 at 12:19 p.m.
A newly discovered role for specialized brain cells called tanycytes may hold the key to understanding and potentially treating Alzheimer’s disease. Researchers have found that these cells, responsible for clearing toxic tau protein from the brain, grow impaired in Alzheimer’s patients, leading to a buildup of the protein and subsequent neurodegeneration.
The Alzheimer’s Disease Burden
Alzheimer’s disease affects approximately 900,000 people in France, with 225,000 new cases diagnosed each year.1 The disease is characterized by progressive memory loss, impaired executive functions, and disorientation in time, and space. At its core, Alzheimer’s involves the degeneration of neurons in the hippocampus, which gradually spreads throughout the brain. A key biological marker of the disease is the abnormal accumulation of tau protein.
Tau Protein and the Brain’s Clearance System
In a healthy brain, tau protein is secreted by neurons and efficiently cleared into the bloodstream. However, in individuals with Alzheimer’s disease, tau levels remain elevated in the cerebrospinal fluid (CSF), and the protein changes structure, losing its normal function. This leads to the formation of tau tangles, which disrupt brain function and ultimately cause neuronal death and cognitive decline.2
Tanycytes: The Brain’s Waste Management System
For over two decades, research led by Vincent Prévot, research director at Inserm, has focused on the role of tanycytes.3 These specialized cells act as a crucial interface between the brain and the rest of the body, facilitating exchange between the blood and CSF. Recent research has revealed that tanycytes play a vital role in removing toxic substances, including tau protein, from the brain.
How Tanycytes Clear Tau Protein
Researchers demonstrated that tanycytes capture tau protein from the CSF and transport it to blood capillaries for elimination.1, 2 To confirm this, scientists blocked tanycyte function in mice using botulinum toxin, resulting in reduced tau clearance from the CSF into the bloodstream. This confirms that tanycytes are a primary pathway for tau to exit the brain.
Tanycyte Dysfunction and Alzheimer’s Progression
Further experiments showed that blocking tanycyte activity in mice with high CSF tau levels led to earlier symptoms of dementia and tauopathy – a disease characterized by abnormal tau protein accumulation.3 Analysis of brain tissue from individuals who died from Alzheimer’s disease revealed that tanycytes were damaged and fragmented, disrupting the communication pathway between the CSF and the bloodstream.1, 2
A New Therapeutic Target?
“Our results show in an unprecedented way the capacity of tanycytes to transport the Tau protein from the cerebrospinal fluid to the blood and the importance of these cells in the pathophysiology of Alzheimer’s disease,” explains Vincent Prévot. “They suggest that the degradation of these cells contributes to Alzheimer’s disease.”3 This discovery suggests that preserving tanycyte health could be a viable strategy for slowing the progression of Alzheimer’s disease by restoring the brain’s natural clearing mechanisms.
Focusing on tanycyte health could open new avenues for therapeutic intervention in Alzheimer’s disease.1, 3
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