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Updated: Dec 17, 2025
Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
Gut Microbial Metabolite TMAO Enhances Platelet Hyperreactivity and Thrombosis Risk
Weifei Zhu1, Jill C Gregory1, Elin Org2
1Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA.
Abstract:
Normal platelet function is critical to blood hemostasis and maintenance of a closed circulatory system. Heightened platelet reactivity, however, is associated with cardiometabolic diseases and enhanced potential for thrombotic events. We now show gut microbes, through generation of trimethylamine N-oxide (TMAO), directly contribute to platelet hyperreactivity and enhanced thrombosis potential. Plasma TMAO levels in subjects (n > 4,000) independently predicted incident (3 years) thrombosis (heart attack, stroke) risk. Direct exposure of platelets to TMAO enhanced sub-maximal stimulus-dependent platelet activation from multiple agonists through augmented Ca(2+) release from intracellular stores. Animal model studies employing dietary choline or TMAO, germ-free mice, and microbial transplantation collectively confirm a role for gut microbiota and TMAO in modulating platelet hyperresponsiveness and thrombosis potential and identify microbial taxa associated with plasma TMAO and thrombosis potential. Collectively, the present results reveal a previously unrecognized mechanistic link between specific dietary nutrients, gut microbes, platelet function, and thrombosis risk.
Insights
Gut microbes generate trimethylamine N-oxide (TMAO), a compound that directly increases platelet hyperreactivity and thrombosis risk. Higher TMAO plasma levels predict future heart attack and stroke events.
Area of Science:
- Cardiovascular Biology
- Microbiome Research
- Hematology
Background:
- Normal platelet function is essential for hemostasis.
- Increased platelet reactivity is linked to cardiometabolic diseases and thrombosis.
- The gut microbiome's role in platelet function is not fully understood.
Purpose of the Study:
- To investigate the direct contribution of gut microbes and trimethylamine N-oxide (TMAO) to platelet hyperreactivity and thrombosis.
- To establish a mechanistic link between diet, gut microbiota, TMAO, and thrombosis risk.
Main Methods:
- Analysis of plasma TMAO levels in over 4,000 subjects for prediction of incident thrombosis.
- In vitro studies exposing platelets to TMAO to assess activation.
- Animal model studies using dietary interventions, germ-free mice, and microbial transplantation.
Main Results:
- Elevated plasma TMAO levels independently predicted 3-year risk of thrombosis (heart attack, stroke).
- TMAO exposure enhanced platelet activation via augmented intracellular calcium release.
- Gut microbiota and TMAO were confirmed to modulate platelet hyperresponsiveness and thrombosis potential in vivo.
Conclusions:
- Gut microbes, via TMAO production, directly promote platelet hyperreactivity and increase thrombosis risk.
- A novel mechanistic pathway links dietary nutrients, gut microbiota, TMAO, platelet function, and thrombosis.
- Specific microbial taxa associated with TMAO production and thrombosis potential were identified.
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