Brain HealthAmyloid Beta May Drive Brain Inflammaging Long Before Alzheimer's Develops
Most people know amyloid beta as the hallmark protein clump of Alzheimer's disease, but a new review argues it plays an earlier, subtler role in brain aging. Researchers examine how amyloid beta contributes to 'inflammaging' — the low-grade, chronic inflammation that quietly accumulates as we age — well before any dementia diagnosis. Importantly, the review also highlights amyloid beta's beneficial functions, including antioxidant and antimicrobial activity, reframing it as a dual-purpose molecule rather than a purely toxic one. The analysis maps how different brain cell types — microglia, astrocytes, neurons, and blood-brain barrier cells — each respond to amyloid beta differently. The authors also explore how the brain clears amyloid beta through the glymphatic system and blood-brain barrier, pointing to these pathways as promising therapeutic targets for slowing age-related neurodegeneration.
