Abstract
The bidirectional communication between the central nervous system (CNS) and the gut microbiota plays a pivotal role in human health. Increasing numbers of studies suggest that the gut microbiota can influence the brain and behavior of patients. Various metabolites secreted by the gut microbiota can affect the cognitive ability of patients diagnosed with neurodegenerative diseases. Nearly one in every ten Korean senior citizens suffers from Alzheimer’s disease (AD), the most common form of dementia. This review highlights the impact of metabolites from the gut microbiota on communication pathways between the brain and gut, as well as the neuroinflammatory roles they may have in AD patients. The objectives of this review are as follows: (1) to examine the role of the intestinal microbiota in homeostatic communication between the gut microbiota and the brain, termed the microbiota–gut–brain (MGB) axis; (2) to determine the underlying mechanisms of signal dysfunction; and (3) to assess the impact of signal dysfunction induced by the microbiota on AD. This review will aid in understanding the microbiota of elderly people and the neuroinflammatory roles they may have in AD.
Highlights
Comprising trillions of symbiotic microorganisms, the gut microbiota is an essential element for the maintenance of the host’s health [1,2,3]
This review described the importance of the MGB axis and the bidirectional communication between the gut and brain in regulating the health of the host
Braak and colleagues hypothesized that disease begins in the gut and spreads from the gut to the brain via the MGB axis
Summary
Comprising trillions of symbiotic microorganisms, the gut microbiota is an essential element for the maintenance of the host’s health [1,2,3]. This microbial ecosystem consists mainly of bacteria, of which most are strict anaerobes, and fungi and viruses. Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by a progressive. Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by a progressive loss of loss of memory, language, and cognitive ability. Amyloids associated with AD consist largely of perivascular amyloid enriched in the 4242-amino-acid Aβ42 peptide.
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