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Regulation of blood–brain barrier integrity by microbiome-associated methylamines and cognition by trimethylamine N-oxide
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Abstract
BACKGROUND: Communication between the gut microbiota and the brain is primarily mediated via soluble microbe-derived metabolites, but the details of this pathway remain poorly defined. Methylamines produced by microbial metabolism of dietary choline and L-carnitine have received attention due to their proposed association with vascular disease, but their effects upon the cerebrovascular circulation have hitherto not been studied. RESULTS: Here, we use an integrated in vitro/in vivo approach to show that physiologically relevant concentrations of the dietary methylamine trimethylamine N-oxide (TMAO) enhanced blood-brain barrier (BBB) integrity and protected it from inflammatory insult, acting through the tight junction regulator annexin A1. In contrast, the TMAO precursor trimethylamine (TMA) impaired BBB function and disrupted tight junction integrity. Moreover, we show that long-term exposure to TMAO protects murine cognitive function from inflammatory challenge, acting to limit astrocyte and microglial reactivity in a brain region-specific manner. CONCLUSION: Our findings demonstrate the mechanisms through which microbiome-associated methylamines directly interact with the mammalian BBB, with consequences for cerebrovascular and cognitive function. Video abstract.
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Gut microbiota-derived metabolites are important regulators of BBB integrity.
“Ample evidence has shown that gut microbiota-derived metabolites are important regulators of BBB integrity”
From Microbiota–gut–brain axis and its therapeutic applications in neurodegenerative diseases (2024) · cites this paper as [661]
Chronic low-dose TMAO supplementation prevented LPS-induced BBB alterations and memory impairment in C57Bl/6J mice.
“chronic low-dose TMAO supplementation has been found to prevent LPS-induced BBB alterations and memory impairment in C57Bl/6J mice.”
From Microbiota–gut–brain axis and its therapeutic applications in neurodegenerative diseases (2024) · cites this paper as [661]
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“Moreover, protective roles for TMAO have been reported in rodent models of hypertension [18], atherosclerosis [19] and non-alcoholic steatohepatitis [20] and we have previously shown TMAO to improve glucose homeostasis and insulin secretion in mice fed a high-fat diet [21].”
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Metadata
- Authors
- Hoyles, L., Pontifex, M. G., Rodriguez-Ramiro, I., Anis-Alavi, M. A., Jelane, K. S., Snelling, T., Solito, E., Fonseca, S., Carvalho, A. L., Carding, S. R., Müller, M., Glen, R. C., Vauzour, D., & McArthur, S.
- Affiliations
- Nottingham Trent University (GB)
- University of East Anglia (GB)
- Queen Mary University of London (GB)
- Imperial College London (GB)
- Norwich Research Park (GB)
- University of Cambridge (GB)
- Corresponding author
- Hoyles, Lesley
- McArthur, Simon
- ORCID
- Venue
- Microbiome
- Published
- 2021-11-27
- Volume
- 9
- Issue
- 1
- Pages
- 235-235
- ISSN
- 2049-2618 (ISSN-L)
- PMC
- PMC8626999
- OpenAlex
- W3203565491
- Cited by
- 221
- References
- 16
- Citations by year
- 2026: 41 · 2025: 68 · 2024: 54 · 2023: 32 · 2022: 25
- FWCI
- 11.18
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Microbiome (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Nottingham Trent University's Institutional Repository (Nottingham Trent Repository) (acceptedVersion)
- UEA Digital Repository (University of East Anglia) (acceptedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Queen Mary Research Online (Queen Mary University of London) (submittedVersion, cc-by)
- Apollo (University of Cambridge) (submittedVersion, cc-by)
- Apollo
- Apollo (cc-by)
- Funders
- Alzheimer's Research UK (ARUK-PPG2016B-6)
- Solvo Biotechnology (ReACTS Program)
- Medical Research Council (MR/L01632X/1)
- Imperial College London (Undergraduate Research Opportunities Programme)
- Topics
- Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
- Keywords
- trimethylamine N-oxide, trimethylamine, blood-brain barrier integrity, gut microbiota, methylamine, choline metabolism, L-carnitine, tight junctions, annexin A1, neuroinflammation, cognitive function, astrocytes, microglia, cerebrovascular function, microbiota-brain axis
- MeSH terms
- Animals, Blood-Brain Barrier, Cognition, Mammals, Methylamines, Mice, Microbiota
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