[The role and features of the gut microbiota in Alzheimer's disease.]

Alzheimer's disease causes gradual, persistent deterioration of cognitive function in the elderly, causing social and economic damage to society. Over the past decades, mankind has made significant progress in the study of Alzheimer's disease, but there are no methods to fully control the disease. The lack of effectiveness of existing treatment methods emphasizes the need to search for new approaches. The present review is devoted to the study of the latest data regarding the role of microbiota in the mechanisms of formation and progression of Alzheimer's disease, possible therapeutic ways to influence the processes of neurodegeneration through microbiota and taking into account identified relationships. The article considers the axis «gut microbiota-brain» as a link in the pathogenesis of neuroinflammation. New data on the influence of gut microbiota on neurodegenerative processes through metabolic, nervous, and immune mechanisms is analyzed. New data reveals correlations between microbiota specifics and the origin and/or progression of Alzheimer's disease, expanding the understanding of disease pathogenesis. The role of the oral microbiota in neurodegeneration processes is mentioned, emphasizing the diverse mechanisms of this disease. Available therapies for Alzheimer's disease are discussed, including probiotics and prebiotics, fecal microbiota transplantation, and dietary correction.