Gut Bacteria Byproduct: Blood-Brain Barrier Compromised

Researchers have identified a potential link between gut microbiota metabolism and the development of neurodegenerative processes associated with Alzheimer's disease. According to a study published in Nature Communications, a bacterial byproduct of histidine metabolism called imidazole propionate (ImP) may increase the permeability of the blood-brain barrier (BBB). The study analyzed blood samples and cognitive performance of 1,200 adults with an average age of 61. The data revealed that higher concentrations of ImP correlate with a faster decline in cognitive functions. This association was also linked to the presence of specific biomarkers of nerve tissue damage, including pTau-217 and neurofilament light chain (NfL). To explore the underlying mechanism, scientists conducted experiments on genetically modified mice. These tests confirmed that the accumulation of ImP can facilitate the entry of abnormal proteins into the brain, which subsequently triggers neuron death.