Cited by 1,070Pharmacogenetics and Drug MetabolismGut microbiota and healthNutrition, Genetics, and Disease

Trimethylamine-N-Oxide, a Metabolite Associated with Atherosclerosis, Exhibits Complex Genetic and Dietary Regulation

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Bennett, Brian J., Vallim, Thomas Q. de Aguiar, Wang, Zeneng, Shih, Diana M., Meng, Yonghong, Gregory, Jill, Allayee, Hooman, Lee, Richard +5 more·2013·Cell Metabolism

Abstract

Circulating trimethylamine-N-oxide (TMAO) levels are strongly associated with atherosclerosis. We now examine genetic, dietary, and hormonal factors regulating TMAO levels. We demonstrate that two flavin mono-oxygenase family members, FMO1 and FMO3, oxidize trimethylamine (TMA), derived from gut flora metabolism of choline, to TMAO. Further, we show that FMO3 exhibits 10-fold higher specific activity than FMO1. FMO3 overexpression in mice significantly increases plasma TMAO levels while silencing FMO3 decreases TMAO levels. In both humans and mice, hepatic FMO3 expression is reduced in males compared to females. In mice, this reduction in FMO3 expression is due primarily to downregulation by androgens. FMO3 expression is induced by dietary bile acids by a mechanism that involves the farnesoid X receptor (FXR), a bile acid-activated nuclear receptor. Analysis of natural genetic variation among inbred strains of mice indicates that FMO3 and TMAO are significantly correlated, and TMAO levels explain 11% of the variation in atherosclerosis.

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Crossref · 10.1016/j.cmet.2012.12.011

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  • Gut bacteria transform the choline part of dietary phosphatidylcholine into trimethylamine, which is then oxidized to TMAO by hepatic flavin-containing monooxygenases.

    “Intestinal microbiota convert the choline moiety of dietary phosphatidylcholine into trimethylamine, which is subsequently converted into TMAO by hepatic flavin-containing monooxygenases (Fig. 3).20–23”

    From Intestinal microbial metabolism of phosphatidylcholine and cardiovascular risk (2013) · cites this paper as [23]

    The Introduction describes gut flora converting dietary choline to trimethylamine (TMA), and the Results show that FMO1 and FMO3 oxidize TMA to TMAO; another Results passage locates FMO3 expression and TMA-oxidizing activity in the liver. The paper does not specifically state that the choline comes from dietary phosphatidylcholine, so that part of the claim is not supported by our copy. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Gut bacteria transform the choline part of dietary phosphatidylcholine into trimethylamine, which is then oxidized to TMAO by hepatic flavin-containing monooxygenases.

    “Intestinal microbiota convert the choline moiety of dietary phosphatidylcholine into trimethylamine, which is subsequently converted into TMAO by hepatic flavin-containing monooxygenases (Fig. 3).20–23”

    From Intestinal microbial metabolism of phosphatidylcholine and cardiovascular risk (2013) · cites this paper as [20]

    The Introduction says gut flora convert dietary choline to trimethylamine, and the Results report that FMO1 and FMO3 oxidize trimethylamine to TMAO; the dietary-regulation Results also describe hepatic FMO3 activity. Our copy does not establish the more specific claim that the choline came from dietary phosphatidylcholine. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • TMAO is derived primarily from dietary choline and carnitine through gut microbiota metabolism to TMA, which is absorbed and oxidized in the liver primarily by FMO3 to TMAO.

    “TMAO is derived primarily from dietary choline and carnitine through the action of gut microbiota, which metabolize these constituents to trimethylamine (TMA).1, 11, 12 TMA is absorbed in turn and travels via the portal circulation to the liver, where it is oxidized by flavin‐containing monoxygenases, primarily FMO3, to TMAO.1, 11, 12”
  • Hepatic FMO enzyme activity did not differ significantly between donor strains or among recipient groups after cecal microbial transplantation.

    “In contrast, examination of hepatic FMO enzyme activity, which is responsible for converting TMA into TMAO (Wang et al., 2011; Bennett et al., 2013), revealed no significant differences between both donor mouse strains, and among the various recipient groups post cecal microbial transplantation (Figure S6, panel B).”

    From Gut Microbial Metabolite TMAO Enhances Platelet Hyperreactivity and Thrombosis Risk (2016) · cites this paper as Bennett et al., 2013

  • Host hepatic FMO3 is the main enzyme producing TMAO.

    “host hepatic FMO3, the primary FMO responsible for TMAO production”

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Authors
Bennett, B. J., Vallim, T. Q. D. A., Wang, Z., Shih, D. M., Meng, Y., Gregory, J., Allayee, H., Lee, R., Graham, M., Crooke, R., Edwards, P. A., Hazen, S. L., & Lusis, A. J.
Affiliations
  • University of California, Los Angeles (US)
  • Cleveland Clinic (US)
  • University of Southern California (US)
Corresponding author
  • Bennett, Brian J.
  • Lusis, Aldons J.
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2013-01
Volume
17
Issue
1
Pages
49-60
ISSN
1550-4131 (ISSN-L)
OpenAlex
W2046971089
Cited by
1,070
References
35
Citations by year
2026: 75 · 2025: 88 · 2024: 88 · 2023: 95 · 2022: 116 · 2021: 102 · 2020: 107 · 2019: 90 · 2018: 81 · 2017: 50 · 2016: 67 · 2015: 59 · 2014: 32 · 2013: 19
FWCI
64.38
Type
journal article
Language
en
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Howard Hughes Medical Institute
  • Cleveland Clinic
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL3 0568, HL28481, R01HL094322, P01HL030568, R00HL102223, K99HL102223, HL113452, P20HL113452, HL94322, K99/R00 HL102223, R01HL103866, HL103866, P01HL028481)
  • National Institute of General Medical Sciences (T32GM088088)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Nutrition, Genetics, and Disease
Keywords
trimethylamine N-oxide, atherosclerosis, flavin monooxygenase 3, gut microbiota, choline metabolism, bile acids, farnesoid X receptor, androgen regulation, sex differences, genetic variation, dietary regulation
MeSH terms
Receptor, Farnesoid X-Activated, Androgens, Animals, Base Sequence, Bile Acids and Salts, Choline, Diet, Female, Humans, Male, Methylamines, Oxygenases, Sex Factors, Down-Regulation, Receptors, Cytoplasmic and Nuclear, Mice, Knockout, Polymorphism, Single Nucleotide, Gene Silencing, Atherosclerosis, Mice, HEK293 Cells

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