Trimethylamine-N-oxide: the microbial cue in immune-mediated disorders

Area of Science:

• Microbial metabolism and host immunology
• Gut microbiome and its impact on systemic health
• Dietary influences on immune pathways

Background:

• Trimethylamine-N-oxide (TMAO) is a gut microbial metabolite from dietary choline and carnitine.
• TMAO acts as a link between diet, microbial activity, and host immune system function.
• Historically recognized as an osmolyte, TMAO's immune-modulating roles are increasingly understood.

Purpose of the Study:

• To explore the multifaceted roles of TMAO in immune system modulation.
• To investigate TMAO's dual impact on chronic diseases and cancer immunity.
• To review current strategies for modulating TMAO activity.

Main Methods:

• Review of current literature on TMAO biology and immune mechanisms.
• Analysis of TMAO's effects on macrophage polarization and T cell responses.
• Discussion of dietary, microbiome, and enzymatic interventions.

Main Results:

• TMAO activates key immune pathways including oxidative stress, inflammasome, and type I interferon signaling.
• TMAO exacerbates cardiovascular, metabolic, renal, and neurodegenerative diseases.
• TMAO paradoxically enhances antitumor immunity in specific cancer types.

Conclusions:

• TMAO exhibits a dual role in health and disease, impacting chronic conditions and cancer immunity.
• TMAO serves as a significant biomarker and a potential therapeutic target.
• Modulating TMAO levels through diet, microbiome, or enzymatic inhibition offers therapeutic potential.