Cited by 414Cholesterol and Lipid MetabolismGut microbiota and healthPharmacogenetics and Drug Metabolism

The TMAO-Generating Enzyme Flavin Monooxygenase 3 Is a Central Regulator of Cholesterol Balance

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Warrier, Manya, Shih, Diana M., Burrows, Amy C., Ferguson, Daniel, Gromovsky, Anthony D., Brown, Amanda L., Marshall, Stephanie, McDaniel, Allison +19 more·2015·Cell Reports

Abstract

Circulating levels of the gut microbe-derived metabolite trimethylamine-N-oxide (TMAO) have recently been linked to cardiovascular disease (CVD) risk. Here, we performed transcriptional profiling in mouse models of altered reverse cholesterol transport (RCT) and serendipitously identified the TMAO-generating enzyme flavin monooxygenase 3 (FMO3) as a powerful modifier of cholesterol metabolism and RCT. Knockdown of FMO3 in cholesterol-fed mice alters biliary lipid secretion, blunts intestinal cholesterol absorption, and limits the production of hepatic oxysterols and cholesteryl esters. Furthermore, FMO3 knockdown stimulates basal and liver X receptor (LXR)-stimulated macrophage RCT, thereby improving cholesterol balance. Conversely, FMO3 knockdown exacerbates hepatic endoplasmic reticulum (ER) stress and inflammation in part by decreasing hepatic oxysterol levels and subsequent LXR activation. FMO3 is thus identified as a central integrator of hepatic cholesterol and triacylglycerol metabolism, inflammation, and ER stress. These studies suggest that the gut microbiota-driven TMA/FMO3/TMAO pathway is a key regulator of lipid metabolism and inflammation.

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Crossref · 10.1016/j.celrep.2014.12.036

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  • FMO3 inhibition causes side effects including hepatic inflammation.

    “FMO3 inhibition is also accompanied by several untoward side effects, including hepatic inflammation”
  • Downregulation or knock-out of FMO3 leads to decreased levels of TMAO and is athero-protective, whereas increased expression of FMO3 leads to pro-atherogenic lipid profiles such as higher VLDL and LDL.

    “downregulation or knock-out of FMO3 leads to decreased levels of TMAO and it is athero-protective in these models, whereas increased expression of FMO3 leads to pro-atherogenic lipid profiles (e.g., higher VLDL and LDL) [75,76].”
  • FMO3, which is differentially regulated in male and female mice, is necessary but apparently not sufficient for the development of the diabetic phenotype.

    “Taken together, these data suggest that FMO3, which is differentially regulated in male and female mice, is necessary but apparently not sufficient for the development of the diabetic phenotype.”
  • Accumulation of TMA leads to trimethylaminuria, which is characterized by fishy odor and induces inflammation.

    “Nevertheless, there could be several problems with this approach as an accumulation of TMA leads to trimethylaminuria, which is characterized by fishy odor (similar to rotten fish) and induce inflammation [18,75,99].”
  • FMO3 knockdown altered intestinal cholesterol absorption, hepatic cholesterol ester storage, and macrophage reverse cholesterol transport in a dietary cholesterol-dependent manner.

    “FMO3 knockdown altered several steps of cholesterol balance, including intestinal cholesterol absorption, hepatic cholesterol ester storage, and macrophage RCT in a dietary cholesterol-dependent manner (121).”

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Research works printed but not linked: 4

  1. Brufau G Groen AK Kuipers F Reverse cholesterol transport revisited: contribution of biliary versus intestinal cholesterol excretion Arterioscler. Thromb. Vasc. Biol 2011 31 1726 1733 21571685
  2. Rader DJ Tall AR The not-so-simply HDL story: Is it time to revise the HDL cholesterol hypothesis? Nat. Med 2012 18 1344 1346 22961164
  3. Rosenson RS Brewer HB Jr Davidson WS Fayad ZA Fuster V Goldstein J Hellerstein M Jiang XC Phillips MC Rader DJ Cholesterol efflux and atheroprotection: advancing the concept of reverse cholesterol transport Circulation 2012 125 1905 1919 22508840 PMC4159082
  4. Temel RE Tang W Ma Y Rudel LL Willingham MC Ioannou YA Davies JP Nilsson LM Yu L Hepatic Niemann-Pick C1-like 1 regulates biliary cholesterol concentrations and is a target of ezetimibe J. Clin. Invest 2007 117 1968 1978 17571164 PMC1888567

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Authors
Warrier, M., Shih, D. M., Burrows, A. C., Ferguson, D., Gromovsky, A. D., Brown, A. L., Marshall, S., McDaniel, A., Schugar, R. C., Wang, Z., Sacks, J., Rong, X., Vallim, T. D. A., Chou, J., Ivanova, P. T., Myers, D. S., Brown, H. A., Lee, R. G., Crooke, R. M., Graham, M. J., Liu, X., Parini, P., Tontonoz, P., Lusis, A. J., Hazen, S. L., Temel, R. E., & Brown, J. M.
Affiliations
  • Cleveland Clinic (US)
  • University of California, Los Angeles (US)
  • Wake Forest University Health Sciences (US)
  • Vanderbilt University (US)
  • Ionis Pharmaceuticals (United States) (US)
  • Karolinska Institutet (SE)
  • Howard Hughes Medical Institute (US)
  • University of Kentucky (US)
Corresponding author
Brown, J. Mark
Venue
Cell Reports
Publisher
Elsevier BV
Published
2015-01
Volume
10
Issue
3
Pages
326-338
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2046316092
Cited by
414
References
51
Citations by year
2026: 24 · 2025: 24 · 2024: 31 · 2023: 38 · 2022: 45 · 2021: 48 · 2020: 43 · 2019: 33 · 2018: 39 · 2017: 32 · 2016: 39 · 2015: 18
FWCI
43.34
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • UKnowledge (University of Kentucky) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-nd)
Funders
  • National Institutes of Health (UL1TR000439)
  • National Heart, Lung, and Blood Institute (R00HL096166, T32HL091797, P20HL113452, R01HL066088, R01HL103866, R01HL122283)
  • National Institute of General Medical Sciences (U54GM069338)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK063491)
  • National Center for Research Resources (UL1RR024989)
  • National Center for Advancing Translational Sciences
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
Keywords
trimethylamine N-oxide, flavin monooxygenase 3, reverse cholesterol transport, cholesterol metabolism, gut microbiota, liver X receptor, endoplasmic reticulum stress, intestinal cholesterol absorption, biliary lipid secretion, macrophages, cardiovascular risk, inflammation, triglyceride metabolism

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