Related Experiment Video
Updated: Aug 16, 2025
Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
Published on: May 23, 2025
Platelet-derived microparticles stimulated by anti-β2GPI/β2GPI complexes induce pyroptosis of endothelial cells in
Longjiang Di1, Caijun Zha1, Yanhong Liu1
1Department of Clinical Laboratory, Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China.
Abstract:
Platelet microparticles (PMPs) are vesicles that are released by platelets into the extracellular space and play a role in antiphospholipid antibody syndromes. PMPs have recently been recognized as a new and viable cell. There is growing evidence that the anti-β2 glycoprotein (GPI)/β2GPI complex is associated with aberrant activation of PMPs. Although studies suggest that aberrant activation of PMPs may lead to inflammatory necrosis of endothelial cells, the underlying mechanisms remain unclear. We found that although the difference in the number of PMPs was not statistically significant, NLR family pyrin domain containing 3 (NLRP3) within PMPs was increased during stimulation of anti-β2GPI/β2GPI complexes. Furthermore, we demonstrated that anti-β2GPI/β2GPI complex-induced PMPs effectively stimulated endothelial cell pyroptosis via the NLRP3/nuclear factor (NF)-κB/gasdermin D (GSDMD) signaling pathway as well as the NLRP3/Caspase-1 signaling pathway. Additionally, inhibition of NLRP3 expression in PMPs effectively reduced the inflammatory response and pyroptosis in endothelial cells. Our data suggest that PMPs aberrantly activated by anti-β2GPI/β2GPI complexes play a vital role in endothelial cell pyroptosis, and these studies provide major insights into the mechanisms of thrombosis during the treatment of antiphospholipid antibody syndrome.
Insights
Platelet microparticles (PMPs) activated by anti-β2GPI complexes trigger endothelial cell pyroptosis via the NLRP3 inflammasome. Inhibiting NLRP3 in PMPs reduces inflammation, offering insights into antiphospholipid antibody syndrome treatments.
Area of Science:
- Immunology
- Cell Biology
- Pathology
Background:
- Platelet microparticles (PMPs) are extracellular vesicles involved in antiphospholipid antibody syndromes.
- Aberrant activation of PMPs by anti-β2 glycoprotein (GPI)/β2GPI complexes is linked to endothelial cell damage.
- The precise mechanisms underlying PMP-induced endothelial cell injury remain unclear.
Purpose of the Study:
- To investigate the role of NLRP3 inflammasome activation within PMPs in endothelial cell pyroptosis.
- To elucidate the signaling pathways involved in anti-β2GPI/β2GPI complex-induced PMP activation and subsequent endothelial cell pyroptosis.
- To assess the therapeutic potential of inhibiting NLRP3 in PMPs.
Main Methods:
- Analysis of NLRP3 expression in PMPs stimulated with anti-β2GPI/β2GPI complexes.
- Assessment of endothelial cell pyroptosis induced by PMPs using specific signaling pathway analysis (NLRP3/NF-κB/GSDMD and NLRP3/Caspase-1).
- Evaluation of the effects of NLRP3 inhibition in PMPs on endothelial cell inflammatory responses and pyroptosis.
Main Results:
- NLRP3 levels were increased within PMPs upon stimulation with anti-β2GPI/β2GPI complexes.
- Anti-β2GPI/β2GPI complex-induced PMPs promoted endothelial cell pyroptosis through NLRP3-dependent pathways.
- Inhibition of NLRP3 in PMPs significantly attenuated endothelial cell pyroptosis and inflammation.
Conclusions:
- Aberrantly activated PMPs by anti-β2GPI/β2GPI complexes are key drivers of endothelial cell pyroptosis.
- The NLRP3 inflammasome plays a critical role in mediating PMP-induced endothelial cell pyroptosis.
- Targeting NLRP3 in PMPs presents a potential therapeutic strategy for antiphospholipid antibody syndrome-associated thrombosis.
More Related Videos
05:49Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
Published on: November 29, 2024
04:32A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
Published on: June 5, 2019
Related Concept Videos
01:22Formation of the Platelet Plug
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
01:18Structure and Function of Platelets
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...