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Updated: Feb 17, 2026

Microfluidics in Assessing Platelet Function
Published on: November 8, 2024
TRAF3 negatively regulates platelet activation and thrombosis
Rui Zhang1,2, Guoying Zhang1, Binggang Xiang1
1Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, University of Kentucky, 741 South Limestone Street, Lexington, KY, 40536, USA.
Tumor necrosis factor superfamily member CD40 ligand (CD40L) interacts with CD40. TRAF3 negatively regulates platelet activation and thrombus formation, as demonstrated by increased aggregation and accelerated thrombus development in TRAF3 knockout mice.
Area of Science:
- Immunology
- Hematology
- Molecular Biology
Background:
- CD40 ligand (CD40L), a TNF superfamily member, binds CD40, influencing various cell types.
- Platelets express CD40L and contribute to soluble CD40L levels, potentiating platelet activation and thrombus formation.
- TNF receptor associated factors (TRAFs) mediate CD40L-CD40 signaling; TRAF2 is implicated in CD40L-induced platelet activation.
Purpose of the Study:
- To investigate the role of TRAF3 in platelet activation and CD40L signaling.
- To determine whether TRAF3 influences platelet aggregation, secretion, and thrombus formation in vivo.
Main Methods:
- Analysis of platelet aggregation and secretion in TRAF3 knockout mice.
- Assessment of thrombus formation using a FeCl3-induced thrombosis model.
- Evaluation of mouse tail-bleeding times.
Main Results:
- TRAF3 knockout mice exhibited enhanced thrombin- or collagen-induced platelet aggregation and secretion.
- Platelet receptor expression (GPVI, αIIbβ3) remained unaffected by TRAF3 deletion.
- Thrombus formation time was significantly reduced in TRAF3 knockout mice, while tail-bleeding times were unchanged.
Conclusions:
- TRAF3 acts as a negative regulator of platelet activation.
- TRAF3 plays a significant role in inhibiting thrombus formation in vivo.
- Targeting TRAF3 could offer therapeutic potential in modulating platelet function and thrombosis.
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