Myelin Breakdown And Alzheimer's
More on brain aging research from 7news: "The breakdown of myelin, a sheet of fat that insulates nerves and helps speed messages through the brain, appears to be a key contributor to the onset of Alzheimer's disease ... They found the severity and rate of myelin breakdown was correlated with the type of APOE, or apolipoprotein-E, gene a person had. Previous research has shown APOE status to be the second-biggest risk factor for the disease after ageing, with a version called APOE-4 putting persons at highest risk. ... breakdown of myelin, a natural part of the ageing process, proceeded most rapidly for those with APOE-4, less so for those with APOE-3 and most slowly for those with APOE-2. APOE-2 is thought to offer some protection from Alzheimer's, while APOE-3 is seen as neutral. ... These new findings offer, for the first time, compelling genetic evidence that myelin breakdown underlies both the advanced age and the principal genetic risks for Alzheimer disease."