Thrombomodulin Function in Vascular Biology

Thrombomodulin is a transmembrane glycoprotein predominantly expressed on vascular endothelial cells, serving as a high‐affinity receptor for thrombin. By forming a complex with thrombin, thrombomodulin shifts thrombin’s substrate specificity away from fibrinogen cleavage and factor V activation towards the activation of protein C, thereby exerting a potent anticoagulant effect. Beyond coagulation, thrombomodulin participates in anti‐inflammatory signalling, modulating pathways such as mitogen‐activated protein kinases, and contributes to vascular integrity through effects on cell adhesion and barrier function. The lectin‐like domain of thrombomodulin mediates interactions with select carbohydrates and extracellular matrix proteins, influencing cell migration and angiogenesis. Under physiological and pathological conditions, cleavage of thrombomodulin releases soluble fragments (sTM) and microvesicle‐associated forms into the circulation, which serve both as biomarkers of endothelial dysfunction and as active mediators in inflammation and thrombosis. Collectively, these diverse functions underscore thrombomodulin’s central role in maintaining vascular homeostasis and its therapeutic potential across a spectrum of cardiovascular, inflammatory and metabolic diseases.

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Recent studies in osteoarthritis models have revealed that chondrocyte‐derived thrombomodulin and recombinant soluble thrombomodulin domains protect cartilage by enhancing cell survival and migration, and by inhibiting interleukin‐1β signalling. Mice lacking the lectin‐like domain exhibit accelerated cartilage degradation, whereas miRNA antagomir strategies that upregulate thrombomodulin mitigate joint damage, suggesting a novel target for degenerative joint disease. In a murine model of Shiga toxin‐induced haemolytic‐uraemic syndrome, deletion of the N‐terminal lectin‐like domain rendered animals more susceptible to microangiopathic injury and increased mortality; administration of recombinant human thrombomodulin showed limited protective effects, highlighting complexities in domain‐specific therapeutic interventions. A comprehensive review of circulating thrombomodulin forms has categorised the enzymatic and microvesicle‐mediated release mechanisms of soluble fragments, detailed analytical methods for quantification in biofluids, and correlated elevated sTM levels with endothelial injury in sepsis, disseminated intravascular coagulation and metabolic disorders, reinforcing its value as a dynamic biomarker in vascular pathologies.

Thrombomodulin Function in Vascular Biology publication trend

The graph below shows the total number of articles in thrombomodulin function in vascular biology across all publications each year (not limited to Nature Index journals).

Technical terms

Thrombomodulin: A transmembrane endothelial glycoprotein that binds thrombin and alters its substrate specificity to activate anticoagulant pathways.

Protein C: A vitamin‐K‐dependent plasma zymogen that, when activated by the thrombin–thrombomodulin complex, degrades clotting factors Va and VIIIa to inhibit coagulation.

Lectin‐like domain: The N‐terminal carbohydrate‐binding region of thrombomodulin involved in anti‐inflammatory signalling and cell adhesion.

Soluble thrombomodulin (sTM): Cleaved extracellular fragments of thrombomodulin detectable in circulation, serving as markers of endothelial injury and active modulators of inflammation.

References

1. Chondrocyte Thrombomodulin Protects against Osteoarthritis. International Journal of Molecular Sciences (2023).
2. The Role of the N-Terminal Domain of Thrombomodulin and the Potential of Recombinant Human Thrombomodulin as a Therapeutic Intervention for Shiga Toxin-Induced Hemolytic-Uremic Syndrome. Toxins (2024).
3. Circulating Thrombomodulin: Release Mechanisms, Measurements, and Levels in Diseases and Medical Procedures. TH Open (2022).
4. Thrombomodulin Regulation of Mitogen-Activated Protein Kinases. International Journal of Molecular Sciences (2019).
5. Complex formation between thrombin and thrombomodulin inhibits both thrombin-catalyzed fibrin formation and factor V activation.. Journal of Biological Chemistry (1982).
6. The Roles of Protein C and Thrombomodulin in the Regulation of Blood Coagulation. Journal of Biological Chemistry (1989).
7. Thrombomodulin-mediated Cell Adhesion INVOLVEMENT OF ITS LECTIN-LIKE DOMAIN*. Journal of Biological Chemistry (2003).
8. Thrombomodulin promotes focal adhesion kinase activation and contributes to angiogenesis by binding to fibronectin. Oncotarget (2016).