Cited by 287Drug Transport and Resistance MechanismsCholesterol and Lipid MetabolismFibroblast Growth Factor Research

Bile acid signaling pathways from the enterohepatic circulation to the central nervous system

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Mertens, Kim L., Kalsbeek, Andries, Soeters, Maarten R., Eggink, Hannah M.·2017·Frontiers in Neuroscience

Abstract

Bile acids are best known as detergents involved in the digestion of lipids. In addition, new data in the last decade have shown that bile acids also function as gut hormones capable of influencing metabolic processes via receptors such as FXR (farnesoid X receptor) and TGR5 (Takeda G protein-coupled receptor 5). These effects of bile acids are not restricted to the gastrointestinal tract, but can affect different tissues throughout the organism. It is still unclear whether these effects also involve signaling of bile acids to the central nervous system (CNS). Bile acid signaling to the CNS encompasses both direct and indirect pathways. Bile acids can act directly in the brain via central FXR and TGR5 signaling. In addition, there are two indirect pathways that involve intermediate agents released upon interaction with bile acids receptors in the gut. Activation of intestinal FXR and TGR5 receptors can result in the release of fibroblast growth factor 19 (FGF19) and glucagon-like peptide 1 (GLP-1), both capable of signaling to the CNS. We conclude that when plasma bile acids levels are high all three pathways may contribute in signal transmission to the CNS. However, under normal physiological circumstances, the indirect pathway involving GLP-1 may evoke the most substantial effect in the brain.

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Crossref · 10.3389/fnins.2017.00617

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  • BA receptors are present in the brain, and BAs can be synthesized locally or actively transported across the BBB by BA transporters from circulation.

    “BA receptors are present in the brain, and BAs can either be synthesized locally or actively transported across the BBB by BA transporters from circulation (297, 301, 302).”
  • BAs are important modulators of the MGB axis, functioning directly via BA receptors in the ENS and brain or indirectly via GLP-1 or the FXR-FGF15/19 axis.

    “these metabolites have emerged as important modulators of the MGB axis, functioning directly via BA receptors in the ENS and brain or indirectly via GLP-1 or the FXR-FGF15/19 axis (297, 319).”
  • Some reports suggest bile acids can cross the blood-brain barrier, whereas other bile acid conjugates signal directly to the brain as neuroactive ligands by binding FXR and TGR5 in the CNS or indirectly by binding these receptors in the gastrointestinal tract and initiating a signaling cascade.

    “Some reports suggest that bile acids can cross the BBB, whereas other bile acid conjugates have been shown to signal directly to the brain as neuroactive ligands, either by binding to farnesoid X receptor and Takeda G protein-coupled receptor 5 (TGR5) present in the CNS or indirectly by binding these receptors in the gastrointestinal tract and initiating a signaling cascade (411).”

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Authors
Mertens, K. L., Kalsbeek, A., Soeters, M. R., & Eggink, H. M.
Affiliations
  • University of Amsterdam (NL)
  • Netherlands Institute for Neuroscience (NL)
  • Amsterdam UMC Location University of Amsterdam (NL)
Corresponding author
Eggink, Hannah M.
Venue
Frontiers in Neuroscience
Published
2017-11-07
Volume
11
Pages
617-617
ISSN
1662-453X (ISSN-L)
OpenAlex
W2767947916
Cited by
287
References
195
Citations by year
2026: 25 · 2025: 35 · 2024: 39 · 2023: 30 · 2022: 56 · 2021: 34 · 2020: 35 · 2019: 21 · 2018: 11 · 2017: 1
FWCI
1.95
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • KNAW research portal (Royal Academy of Art and Sciences (KNAW)) (publishedVersion, other-oa)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Pure Amsterdam UMC (submittedVersion, other-oa)
Funders
Diabetes Fonds (2011.80.1423)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fibroblast Growth Factor Research
Keywords
bile acids, enterohepatic circulation, central nervous system, farnesoid X receptor, TGR5, FGF19, glucagon-like peptide-1, gut-brain signaling, bile acid receptors, gastrointestinal hormones

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