Ilsan Paik Hospital study links brain proteins to Alzheimer's behavioral symptoms

Research led by Professor Lee Young-gun of Ilsan Paik Hospital has identified links between specific brain proteins and the behavioral and psychological symptoms of Alzheimer's disease. By analyzing data from the Alzheimer’s Disease Neuroimaging Initiative (ADNI) database, the study examined 336 individuals ranging from those with normal cognitive function to those with early-stage dementia.

The findings indicate that higher accumulation of tau protein in the frontal lobe, temporal lobe, and limbic system is associated with increased risks of delusions, agitation, aggression, repetitive behaviors, and appetite disturbances. Specifically, the risk of delusions was approximately 2.6 times higher in patients with high tau levels.

Additionally, the study found that abnormal changes in alpha-synuclein—a protein associated with Lewy body dementia and Parkinson's disease—were linked to higher probabilities of delusions, anxiety, apathy, and sleep disorders. Even when accounting for amyloid-beta and tau, these associations remained significant. The research suggests that behavioral symptoms should be understood through these specific pathological changes rather than just as side effects of cognitive decline, potentially allowing for more precise patient management and diagnosis.