Study Reveals How Tau Protein Escapes Lysosomes to Spread Between Brain Cells
Researchers used cryo-electron tomography to identify how tau protein fibrils escape from lysosomes and spread between neurons and astrocytes in the brain. The study found that tau causes reversible membrane damage rather than direct lysosomal rupture, and identified specific cellular pathways (PITT and VPS13C) that facilitate this escape. Understanding tau's spreading mechanism could inform therapeutic strategies for neurodegenerative diseases like Alzheimer's.
A new study published on bioRxiv investigates the cellular mechanisms by which pathological tau protein spreads between brain cells, a hallmark of Alzheimer's disease and other tauopathies. Using advanced imaging techniques, researchers found that tau protein fibrils do not directly damage lysosomal membranes as previously thought, but instead cause reversible holes that allow leakage into the cytosol. The study identified several cellular repair pathways involved in controlling tau spread, with the PITT pathway and VPS13C lipid transporter playing particularly strong roles in both neurons and astrocytes. The findings suggest tau-induced co-aggregation with other cellular materials within lysosomes facilitates escape, rather than catastrophic membrane rupture. These results provide structural insight into how tau propagates through the brain and may guide development of therapeutics targeting lysosomal function.
Limitations & open questions
The study does not discuss potential therapeutic implications or whether findings from this in vitro/cellular model translate to whole-organism or human disease contexts. Additionally, the preprint has not undergone peer review, and the authors do not explicitly state whether this work has been submitted for publication or what the timeline for peer review might be.
What different sources said
- bioRxivCenter
Structural Mechanism and Cellular Restriction of Tau Seeding from Endolysosomes
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