Alzheimer's Drug May Stop Disease If Used Before Symptoms Develop, Study Suggests
Published 2018-08-01 07:00:00 PM - (342 Reads) -A study published in Alzheimer's & Dementia has yielded new insights into how Alzheimer's develops at the molecular level, before extensive neuronal damage occurs and symptoms manifest, reports ScienceDaily . The researchers also found the drug memantine, currently used for alleviating the symptoms of moderate-to-severe Alzheimer's, could prevent or retard its progression if used before symptoms appear. At the onset of the disease, there is a long period, perhaps 10 years or more, when neurons affected by the disease attempt to divide, possibly to compensate for the death of neurons. A student of University of Virginia Professor George Bloom proved that excess calcium entering neurons via calcium channels on their surface drive those neurons back into the cell cycle, before a series of events that ultimately produce the plaques found in the Alzheimer's brain. Neurons exposed to toxic amyloid oligomers cause the channel, called the NMDA receptor, to open, allowing the calcium flow that drives neurons back into the cell cycle. Memantine blocks cell cycle reentry by sealing the NMDA receptor. "The experiments suggest that memantine might have potent disease-modifying properties if it could be administered to subjects long before they have become symptomatic and diagnosed with Alzheimer's disease," Bloom says.