Trimethylamine-N-oxide, a metabolite associated with atherosclerosis, exhibits complex genetic and dietary regulation.

Cell metabolism (2013-01-15)
Brian J Bennett, Thomas Q de Aguiar Vallim, Zeneng Wang, Diana M Shih, Yonghong Meng, Jill Gregory, Hooman Allayee, Richard Lee, Mark Graham, Rosanne Crooke, Peter A Edwards, Stanley L Hazen, Aldons J Lusis
RESUMEN

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.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Monoclonal ANTI-FLAG® M2 antibody produced in mouse, 1 mg/mL, clone M2, affinity isolated antibody, buffered aqueous solution (50% glycerol, 10 mM sodium phosphate, and 150 mM NaCl, pH 7.4)
Sigma-Aldrich
Trimethylamine N-oxide, 95%
Sigma-Aldrich
Trimethylamine, anhydrous, ≥99%
Sigma-Aldrich
Trimethylamine hydrochloride, 98%
Sigma-Aldrich
Trimethylamine solution, 43.0-49.0% in H2O (T)
Sigma-Aldrich
Trimethylamine solution, 31-35 wt. % in ethanol, 4.2 M, contains toluene as stabilizer
Sigma-Aldrich
Trimethylamine solution, 25 wt. % in H2O
Sigma-Aldrich
Trimethylamine solution, 25 wt. % in propylene glycol