Alzheimer's disease may damage the brain in two distinct phases, based on new research funded by the National Institutes of Health (NIH) using sophisticated brain mapping tools. According to researchers who discovered this new view, the first, early phase happens slowly and silently -; before people experience memory problems -; harming just a few vulnerable cell types. In contrast, the second, late phase causes damage that is more widely destructive and coincides with the appearance of symptoms and the rapid accumulation of plaques, tangles, and other Alzheimer's hallmarks.
One of the challenges to diagnosing and treating Alzheimer's is that much of the damage to the brain happens well before symptoms occur. The ability to detect these early changes means that, for the first time, we can see what is happening to a person's brain during the earliest periods of the disease. The results fundamentally alter scientists' understanding of how Alzheimer's harms the brain and will guide the development of new treatments for this devastating disorder.
" Richard J. Hodes, M.D.
, Director, NIH National Institute on Aging Scientists analyzed the brains of 84 people, and the results, published in Nature Neuroscience , suggest that damage to one type of cell, called an inhibitory neuron, during the early phase may trigger the neural circuit problems that underlie the disease. Additionally, the study confirmed previous findings about how Alzheimer's damages the brain and identified many new c.
