• Common pneumonia bacterium may fuel Alzheimerâ s disease A common pneumonia-causing bacterium may secretly fuel Alzheimerâ sâ turning the eye into a surprising early warning sign. • A common respiratory bacterium that typically causes pneumonia and sinus infections may also play a role in Alzheimer’s disease. • Researchers at Cedars-Sinai report thatChlamydia pneumoniaecan persist in both the eye and the brain for years, where it may worsen the damage associated with Alzheimer’s. • The findings, published inNature Communications, suggest that addressing chronic infection and inflammation could open the door to new treatment strategies, including early antibiotic use and therapies designed to reduce inflammation. • For the first time, scientists showed thatChlamydia pneumoniaecan travel to the retina, the light sensitive tissue at the back of the eye. • Once there, it activates immune responses that are tied to inflammation, loss of nerve cells, and declining cognitive function.
Article Summaries:
- Summary
Researchers at Cedars‑Sinai have identified the pneumonia‑causing bacterium Chlamydia pneumoniae as a potential contributor to Alzheimer’s disease. The study, published in Nature Communications, shows the pathogen can persist in the retina and brain, triggering inflammation, neuronal death, and amyloid‑β production-hallmarks of Alzheimer’s pathology. Higher bacterial loads were found in patients with Alzheimer’s, particularly those carrying the APOE4 risk allele, and correlated with greater cognitive decline. The findings suggest retinal imaging could serve as a non‑invasive early warning of disease and point to chronic infection and inflammation as possible therapeutic targets.
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