There’s a New Link Between Gut Health and Alzheimer’s Disease
Researchers found that a metabolite produced by gut bacteria can weaken the barrier that protects the brain and promote changes associated with the cognitive disease.
Researchers have discovered a potential connection between gut health and Alzheimer's disease, suggesting that a specific compound produced by gut bacteria may play a role. Imidazole propionate (ImP), a metabolite generated by certain gut bacteria, is believed to be the link. The study, published in Nature Communications, posits that ImP can enter the bloodstream and potentially weaken the blood-brain barrier, allowing it to reach the brain.
Once in the brain, ImP can exacerbate two key Alzheimer's-related processes: the accumulation of amyloid beta plaques and the abnormal modification of tau proteins. The researchers tested this hypothesis in humans and mice, finding that higher levels of ImP were associated with faster cognitive decline in cognitively healthy adults.
In mice genetically predisposed to Alzheimer's, ImP worsened disease symptoms, increasing amyloid beta plaques and tau abnormalities. While some bacteria capable of producing ImP are present in healthy individuals, the concentration of the metabolite in the bloodstream depends on various factors, including age, sex, and genetics.
The study suggests that instead of targeting the bacteria themselves, a more promising approach may involve developing inhibitors to reduce ImP levels in the blood, similar to how statins lower cholesterol to reduce cardiovascular risk.
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