Iron overload gradually increases neurons' vulnerability to neurodegeneration

Neurodegenerative diseases affect tens of millions of people worldwide. Among these, Alzheimer's and Parkinson's diseases are the most common; in the United States alone, the Alzheimer's Disease Association and Parkinson's Foundation report roughly 7 million people with Alzheimer's and another million with Parkinson's. An intriguing clue lies in the tangled mystery of neurodegeneration that scientists are working to solve: iron accumulation.

Scientists have noticed that iron can slowly build up inside neurons. Early in life, this iron accumulation appears to have little effect on neuronal function. However, later in life, it can contribute to a slow neuronal demise. Salk Institute researchers studied nerve cells to figure out if and how this iron accumulation relates to neurodegenerative diseases. They found that the excess iron stuck in neurons lowers the cells' defenses, making them more vulnerable to stressors and other cellular insults through a process they named chronoferroptosis.

The study, published in Cell Death Discovery on June 18, 2026, points to iron accumulation as a key target in the effort to predict, prevent, and treat neurodegenerative diseases.

Resilience has become a huge topic of discussion when it comes to Alzheimer's disease and other neurodegenerative disorders, trying to make the brain more resilient in the face of stressors that contribute to neurodegeneration. Our study reveals that cells lose resilience when iron hits a certain level, making neurons more susceptible to stressors that damage or even kill them."