Tau proteins play an essential role in maintaining a healthy, properly functioning nervous system. They interact with tubulin, a spherical protein that serves as the building block of microtubules, which are critical to cell structure and intracellular transport. Under normal conditions, tau proteins bind to tubulin and help stabilize microtubules within the axon—the long projection of a neuron that carries signals away from the cell body.
These microtubules act like internal highways, allowing nutrients, signaling molecules, and electrical impulses to travel efficiently along the axon. When tau proteins are functioning properly, they help maintain the integrity of this transport system and support normal nerve signaling.
In certain neurodegenerative conditions, known collectively as tauopathies, tau proteins become abnormal. In disorders such as Alzheimer’s disease, tau can lose its ability to stabilize microtubules, leading to structural instability within the axon. As microtubules break down, nerve signal transmission becomes impaired. Over time, this disruption in communication within the central nervous system contributes to symptoms such as cognitive decline and dementia.
