Utah Scientists Find Arc Protein Drives Alzheimer's Tau Spread in Mice, Opening 1 New Therapy Route
Updated
Updated · ScienceDaily · Jul 5
Utah Scientists Find Arc Protein Drives Alzheimer's Tau Spread in Mice, Opening 1 New Therapy Route
3 articles · Updated · ScienceDaily · Jul 5
Summary
Cell-published experiments in mice found the brain protein Arc is essential for toxic Tau to move from damaged neurons into healthy ones, sharply reducing spread when Arc was removed.
Arc normally travels between neurons inside extracellular vesicles, and the study showed Tau hijacks those vesicles to seed new tangles after entering neighboring cells.
Mice lacking Arc carried very little Tau in those vesicles, but the loss also trapped toxic Tau inside already sick neurons, causing them to die faster.
Human brain samples also contained vesicles with both Arc and Tau, suggesting the mechanism may extend beyond mice, though the researchers said any treatment remains far off.
The work points to blocking Tau-laden vesicles from entering healthy neurons—rather than stopping Tau release entirely—as a potential way to slow Alzheimer's progression.
A brain protein spreads Alzheimer's but also keeps neurons alive. How can we stop the disease without accelerating brain cell death?
Scientists found how toxic proteins 'hitchhike' to spread Alzheimer's. Does this explain why so many previous treatments have failed?
Arc Protein Identified as Key Mediator of Tau Spread in Alzheimer’s: New Therapeutic and Diagnostic Frontiers
Overview
A recent breakthrough by University of Utah scientists has revealed that the brain protein Arc plays a crucial role in the spread of toxic Tau protein, a key factor in Alzheimer's disease progression. This discovery shows that Arc helps package and transport Tau within tiny sacs called extracellular vesicles, which then move between brain cells. Studies of human brain tissue found that these vesicles contain both Arc and disease-related Tau, and their levels are closely linked. This new understanding not only explains how Alzheimer's spreads in the brain but also opens up promising new directions for developing treatments.