Research identifies mechanisms of tau protein spread and cellular dysfunction

Recent research has provided new insights into the mechanisms of tau protein accumulation, a hallmark of neurodegenerative diseases such as Alzheimer's and frontotemporal dementia.

One study investigated how tau seeds induce the formation of neurofibrillary tangles (NFTs) across different brain regions. By analyzing connectivity through functional magnetic resonance imaging, researchers found that tau seeds drive the spread of NFTs both locally and to distal regions via individual-specific neural pathways. This process is closely linked to cognitive decline.

In a separate study, researchers examined the MAPT gene mutation (p. R406W) and its impact on cellular clearance. The findings indicate that this specific mutation disrupts the autophagy-lysosome pathway in human neurons. This disruption leads to reduced lysosome motility and impaired fusion of autophagosomes and lysosomes, causing tau to accumulate in dysfunctional lysosomes. The study suggests that pharmacological enhancement of autophagy may help lower tau levels and restore cellular homeostasis.