Trimethylamine N-oxide

Trimethylamine N-oxide (CAS No.: 1184-78-7) is a gut microbiota–dependent metabolite derived from dietary trimethylamine-containing nutrients such as choline, betaine, and carnitine, and is widely studied as a bioactive small molecule in cardiovascular and inflammatory research. It functions as a modulator of cellular stress and immune signaling by promoting reactive oxygen species generation and activating the NLRP3 inflammasome, thereby contributing to pro-inflammatory responses in diverse experimental systems. In addition, Trimethylamine N-oxide has been shown to drive fibroblast-to-myofibroblast differentiation through activation of the TGF-β/Smad2 signaling pathway, supporting its role in the progression of fibrotic remodeling, particularly in cardiac tissue. These mechanistic properties position it as a valuable tool compound for investigating host–microbiome interactions, inflammation-associated signaling networks, and fibrosis-related pathophysiology. In vitro studies typically employ concentrations in the micromolar range to elicit measurable biological effects, although specific experimental conditions may vary depending on the model system and endpoints. Trimethylamine N-oxide is commonly utilized in cell-based assays and animal models to induce inflammation or fibrosis-like phenotypes, as well as in screening platforms aimed at identifying modulators of oxidative stress, inflammasome activation, and profibrotic signaling pathways.