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Updated: Jun 9, 2025
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Deep Vein Thrombosis Induced by Stasis in Mice Monitored by High Frequency Ultrasonography
Published on: April 13, 2018
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Critical role for platelet Ral GTPases in regulating venous thrombosis in mice
Yong Li1, Jonathan A Furniss1, Jordan Vautrinot1
1School of Physiology, Pharmacology & Neuroscience, University of Bristol, Bristol, United Kingdom.
Journal of Thrombosis and Haemostasis : JTH
|October 25, 2024
Summary
Platelet Ral GTPases are crucial for deep vein thrombosis (DVT) development. Genetic deletion of Ral GTPases in mouse platelets significantly reduces venous thrombus formation and stability by impacting neutrophil extracellular trap (NET) production.
Area of Science:
- Hematology
- Molecular Biology
- Thrombosis Research
Background:
- Deep vein thrombosis (DVT) is a significant global health concern.
- Platelets play an increasingly recognized role in DVT pathophysiology.
- Ral GTPases (RalA and RalB) in mouse platelets are essential for P-selectin externalization.
Purpose of the Study:
- To investigate the role of platelet Ral GTPases in venous thrombosis.
- To determine if Ral GTPases are critical for thromboinflammation in DVT.
Main Methods:
- Induction of deep vein thrombosis via partial inferior vena cava ligation in RalAB double knockout (DKO) mice.
- Assessment of venous thrombi using histology and immunofluorescence microscopy.
- In vitro analysis of platelet-mediated neutrophil extracellular trap (NET) formation.
Main Results:
- RalAB DKO mice exhibited reduced venous thrombus formation at 24 hours and near-complete ablation at 48 hours post-ligation.
- Wild-type thrombi showed organized platelet-leukocyte structures with NETs; this was absent in RalAB DKO thrombi.
- Platelet-specific RalAB deficiency or Ral inhibition reduced platelet-mediated NET formation.
Conclusions:
- Platelet Ral GTPases are novel regulators of venous thrombus stability.
- Ral GTPases facilitate venous thrombosis by modulating neutrophil NET formation.
- Platelet P-selectin is a key mediator in Ral GTPase-driven thromboinflammation.
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