A groundbreaking new study suggests a surprising link between chronic gut infections caused by cytomegalovirus (HCMV) and Alzheimer’s disease.
Researchers at Arizona State University, Banner Alzheimer’s Institute, and collaborating institutions discovered that the virus, common in many adults, may travel from the gut to the brain via the vagus nerve, triggering inflammation and contributing to hallmark Alzheimer’s changes like amyloid plaques and tau tangles.
While HCMV infection usually presents mild, flu-like symptoms or goes unnoticed, this research indicates a potential subset of individuals experiencing chronic gut infections. In these cases, the virus may travel through the vagus nerve, a vital communication pathway connecting the gut and brain, ultimately reaching the brain.
“Our findings suggest that cytomegalovirus infection could be a contributing factor in Alzheimer’s disease in a subset of individuals. While HCMV is widespread, chronic intestinal infection may play a role in some cases,” explains Dr. Eric Reiman, Executive Director of Banner Alzheimer’s Institute and senior author of the study.
Researchers discovered this link by studying brain tissue, spinal fluid, and colon samples from individuals with Alzheimer’s disease. They found a specific type of immune cell, called CD83(+) microglia, increased in the brains of individuals with Alzheimer’s and linked to elevated levels of HCMV antibodies in the gut, suggesting a possible connection between the virus and the immune response in Alzheimer’s.
Interestingly, these findings were also replicated in an independent Alzheimer’s cohort, further strengthening the link.
“Our research suggests a potential avenue for treating Alzheimer’s disease. Could antiviral medications, currently used to combat viral infections, have a role in managing Alzheimer’s in individuals who have chronic HCMV infections?” asks Dr. Reiman. “This opens exciting possibilities for future therapies and preventative measures.”
The research team is now developing a blood test to identify individuals with chronic HCMV infection. Future studies will explore whether antiviral drugs could effectively treat or prevent Alzheimer’s in this specific patient population. These findings represent a significant step forward in understanding Alzheimer’s disease and hold promise for developing targeted, personalized treatments.
To learn more about Alzheimer’s disease research, resources, and potential clinical trials, visit the Alzheimer’s Association website:
https://www.alz.org/
Are you concerned about your risk factors for Alzheimer’s disease? Talk to your doctor today.