Chlamydia pneumoniae and Alzheimer’s: A Potential Breakthrough?

Researchers at Cedars-Sinai Medical Center have discovered that the common respiratory bacterium Chlamydia pneumoniae may be linked to Alzheimer’s disease.paper Published in the journal Nature Communications on January 22, bacteria are not only common in pneumonia and sinus infections, but may also play an important role in the development of Alzheimer’s disease.

The team found that Chlamydia pneumoniae can survive in the retina for a long time, providing new clues for studying Alzheimer’s disease. The retina is part of the central nervous system and allows non-surgical examination of nerves, allowing researchers to instantly observe biological changes related to the brain. When bacteria enter the retina, immune activity associated with inflammation, nerve cell death, and cognitive decline also increases.

“Continued observations of Chlamydia pneumoniae in human tissues, cell cultures, and animal models have led us to identify unknown links between bacterial infection, inflammation, and neurodegeneration,” said lead author Maya Koronyo-Hamaoui, Ph.D.

The concentration of Chlamydia pneumoniae in the retina and brain of patients with Alzheimer’s disease is significantly higher than that of people with normal cognition, and increased bacterial burden is associated with more severe brain lesions and cognitive decline. Genes have also been shown to have an impact, with groups carrying APOE4 gene variants having higher bacterial concentrations.

Researchers studying human neurons and Alzheimer’s disease mice in the laboratory found that Chlamydia pneumoniae infection increased inflammation, nerve cell death and cognitive decline, suggesting that the bacteria may accelerate the progression of the disease. This finding provides new possibilities for treating Alzheimer’s disease along the infection-inflammation axis.

Researchers suggest that chronic bacterial infections and the inflammation they cause may become new treatment strategies. This study also supports the retina as a potential way to non-invasively diagnose and monitor Alzheimer’s disease.

(Source of first picture:Unsplash）

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