Cited by 114Gut microbiota and healthAlzheimer's disease research and treatmentsDrug Transport and Resistance Mechanisms

Bile acids as key modulators of the brain-Gut-Microbiota axis in alzheimer’s disease

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Mulak, Agata·2021·Journal of Alzheimer s Disease

Abstract

Recently, the concept of the brain-gut-microbiota (BGM) axis disturbances in the pathogenesis of Alzheimer's disease (AD) has been receiving growing attention. At the same time, accumulating data revealing complex interplay between bile acids (BAs), gut microbiota, and host metabolism have shed new light on a potential impact of BAs on the BGM axis. The crosstalk between BAs and gut microbiota is based on reciprocal interactions since microbiota determines BA metabolism, while BAs affect gut microbiota composition. Secondary BAs as microbe-derived neuroactive molecules may affect each of three main routes through which interactions within the BGM axis occur including neural, immune, and neuroendocrine pathways. BAs participate in the regulation of multiple gut-derived molecule release since their receptors are expressed on various cells. The presence of BAs and their receptors in the brain implies a direct effect of BAs on the regulation of neurological functions. Experimental and clinical data confirm that disturbances in BA signaling are present in the course of AD. Disturbed ratio of primary to secondary BAs as well as alterations in BA concertation in serum and brain samples have been reported. An age-related shift in the gut microbiota composition associated with its decreased diversity and stability observed in AD patients may significantly affect BA metabolism and signaling. Given recent evidence on BA neuroprotective and anti-inflammatory effects, new therapeutic targets have been explored including gut microbiota modulation by probiotics and dietary interventions, ursodeoxycholic acid supplementation, and use of BA receptor agonists.

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Authors
Mulak, A.
Affiliations
Wroclaw Medical University (PL)
Corresponding author
Mulak, Agata
Venue
Journal of Alzheimer s Disease
Published
2021-11-09
Volume
84
Issue
2
Pages
461-477
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W3203807665
Cited by
114
References
185
Citations by year
2026: 29 · 2025: 26 · 2024: 29 · 2023: 17 · 2022: 12 · 2021: 1
FWCI
1.55
Type
journal article
Language
en
Open access
Locations
  • Journal of Alzheimer s Disease (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
bile acids, brain-gut-microbiota axis
MeSH terms
Neuroprotection, Brain-Gut Axis, Alzheimer Disease, Bile Acids and Salts, Humans, Signal Transduction

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