Aging Protein Linked to Neurodegenerative Disease in Worms and Cells

Scientists have identified a molecular switch that may explain why aging increases the brain's vulnerability to diseases like amyotrophic lateral sclerosis (ALS) and Huntington's disease. The protein EPS8 accumulates with age in worms. This accumulation triggers signaling pathways that encourage toxic proteins to clump together. These protein clumps damage neurons and shorten the lifespan of the worms.

Researchers at the University of Cologne investigated this connection using the nematode worm, *Caenorhabditis elegans*. Their study focused on the protein EPS8. Previous research showed that EPS8 builds up as worms age. It also activates damaging stress responses that reduce their lifespan.

The team found that higher EPS8 levels and increased activity in its signaling pathways promoted pathological protein aggregation and neurodegeneration. These are hallmarks of age-associated neurodegenerative conditions. Reducing EPS8 activity prevented the accumulation of toxic protein aggregates. It also helped preserve neuronal function in worm models of both Huntington's disease and ALS.

EPS8 and its associated signaling molecules are conserved across evolution, appearing in human cells as well. Reducing EPS8 levels in human cell models of Huntington's disease and ALS yielded similar results. This intervention prevented the accumulation of toxic protein aggregates in these cells. The findings suggest a direct molecular link between aging and neurodegeneration.

This research addresses a significant gap in understanding neurodegenerative diseases. It identifies EPS8 and its signaling partners as potential targets for future therapies. Treatments aimed at this pathway could potentially slow or prevent the progression of ALS, Huntington's disease, and other age-related brain disorders. Further research is needed to understand how increased EPS8 activity causes toxic proteins to aggregate.