The relentless spread of Alzheimer's disease through the brain has long been a mystery, but new research from University of Utah Health may have found the missing link. The study identifies a specific brain protein, Arc, as an unexpected accomplice in the movement of toxic Tau proteins from damaged neurons to healthy ones.
How Arc Facilitates the Spread of Tau
According to findings published in Cell, Arc normally plays a vital role in neuronal communication. However, in the context of Alzheimer's, toxic Tau proteins—which form sticky tangles that kill brain cells—exploit this system.The transport occurs via extracellular vesicles (EVs), small membrane-bound sacs used for cellular signaling. By attaching to Arc within these vesicles, Tau is able to travel between neurons, effectively spreading the pathology across different brain regions.
A Shift in Therapeutic Strategy
This discovery opens a promising new avenue for treatment. Rather than attempting to eliminate Tau entirely, future therapies could focus on blocking the transport mechanism.In mouse models, researchers found that removing Arc severely reduced the transfer of Tau to new cells. Jason Shepherd, PhD, professor of neurobiology at University of Utah Health, noted that this provides a potential method to stop the progression of the disease by preventing toxic proteins from reaching healthy neurons.