Common viruses may be triggering the onset of Alzheimer’s di
Alzheimer’s disease can begin almost imperceptibly, often masquerading in the early months or years as forgetfulness that is common in older age. What causes the disease remains largely a mystery. Normally HSV-1 – one of the main variants of the virus - lies dormant within the neurons of the brain, but when it is activated it leads to accumulation of tau and amyloid beta proteins, and loss of neuronal function—signature features found in patients with Alzheimer’s. Our results suggest one pathway to Alzheimer’s disease, caused by a VZV infection which creates inflammatory triggers that awaken HSV in the brain. While they demonstrated a link between VZV and HSV-1 activation, it’s possible that other inflammatory events in the brain could also awaken HSV-1 and lead to Alzheimer’s disease.

Source: https://content.iospress.com/articles/journal-of-alzheimers-disease/jad220287
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