Brain HealthStanford Discovers Protein Traffic Jams Drive Brain Aging and Alzheimer's Risk
Stanford scientists have identified a key molecular reason why brains decline with age: the cellular machinery that builds proteins begins to jam and malfunction. Using turquoise killifish — tiny fish that age rapidly — researchers found that ribosomes, the structures that manufacture proteins, start stalling and colliding as organisms age. This disrupts a critical process called proteostasis, causing misfolded proteins to accumulate into toxic clumps strongly associated with Alzheimer's and other neurodegenerative diseases. The breakdown occurs specifically during translation elongation, when ribosomes read genetic instructions to assemble proteins. Published in Science, the findings offer one of the clearest mechanistic explanations yet for why aging brains become increasingly vulnerable to disease and cognitive decline.
