Related Experiment Video
Updated: Dec 13, 2025
Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
Effect of clopidogrel vs. aspirin on pro-atherosclerotic NLRP1 inflammasome expression in endothelial cells. ECLOAS
Silvia Bleda1, Joaquin de Haro1, Isabel Sánchez2
1Servicio de Angiología y Cirugía Vascular, Hospital Universitario de Getafe, Madrid, España.
Insights
Aspirin and clopidogrel reduce NLRP1 inflammasome expression in endothelial cells by inhibiting platelet activity. Both P2Y and COX pathways effectively lower vascular inflammation, suggesting similar therapeutic potential.
Area of Science:
- Cardiovascular Biology
- Inflammation Research
- Endothelial Cell Biology
Background:
- NLRP1 inflammasome activation is critical in endothelial dysfunction, with platelets playing a key role in preceding inflammation.
- Aspirin (COX enzyme inhibition) and clopidogrel (P2Y receptor inhibition) are known to reduce vascular inflammation.
Purpose of the Study:
- To investigate the influence of platelet inflammatory inhibition via P2Y receptor inhibition versus COX enzyme inhibition.
- To assess the impact on NLRP1 inflammasome transcription within endothelial cells.
Main Methods:
- An open-label, prospective, randomized crossover study involving 20 healthy volunteers.
- Participants received either clopidogrel (75mg/day) or aspirin (100mg/day) for seven days.
- Human aortic endothelial cells (HAECs) were exposed to participant plasma, and NLRP1 gene expression was analyzed.
Main Results:
- Exposure to plasma from volunteers taking aspirin or clopidogrel significantly reduced NLRP1 expression in HAECs compared to baseline plasma.
- NLRP1 expression in HAECs exposed to post-treatment plasma was similar to control (PBS) exposure.
- No significant difference was observed in the percentage reduction of NLRP1 expression between aspirin and clopidogrel treatment groups.
Conclusions:
- Platelet inhibition via the P2Y receptor pathway demonstrates comparable efficacy to COX enzyme inhibition in reducing NLRP1 expression in HAECs.
- Both aspirin and clopidogrel effectively inhibit NLRP1 inflammasome transcription in endothelial cells, suggesting similar anti-inflammatory effects at the vascular level.
Introduction And Objectives:
NRP1 inflammasome is crucial in endothelial dysfunction. Platelets are mandatory for the inflammation that precedes it. Aspirin could inhibit NLRP1 inflammasome in endothelial cells, and clopidogrel could also provoke a reduction in vascular inflammation. A study was carried out on the influence of platelet inflammatory inhibition by P2Y receptor inhibition versus COX enzyme inhibition on the transcription of NLRP1 inflammasome in endothelial cells.
Methods:
An open-label, prospective, randomised crossover study with two periods of platelet inhibition enrolled 20 healthy volunteers. They received clopidogrel 75mg/day/7days and aspirin 100mg/day/7days. A venous blood sample was collected from all participants before and after this period. Human aortic endothelial cells (HAECs) were exposed for 2h in cultures. NLRP1 gene expression was then analysed in these cultures.
Results:
HAEC cultures that were exposed to baseline plasma showed higher expression of NLRP1 than HAECs exposed to plasma after one week of aspirin or clopidogrel intake [relative quantification (RQ), 1.077±0.05 vs. 1.002±0.06; OR, 1.8; 95% CI, 1.1-2.9; P<.01 and 1.077±0.05 vs. 1.04±0.03; OR, 1.7; 95% CI, 1.2-2.6; P<.001, respectively]. NLRP1 expression in HAEC cultures exposed to plasma after one week of aspirin or clopidogrel was similar to that observed in control HAECs that was no exposed to human plasma (PBS) [RQ; 1.002±0.06 vs. 1.009±0.03; OR, 0.9; 95% CI, 0.5-1.4; P=.7, and 1.04±0.03 vs. 1.009±0.03; OR, 0.8; 95% CI, 0.3-1.2; P=.5, respectively]. No difference was observed in NLRP1 percentage reduction in HAEC after aspirin or clopidogrel exposure (3.8% vs. 2.8%, P=.3, respectively).
Conclusions:
Platelet inhibition by P2Y pathway is similar to COX pathway in NLRP1 expression inhibition in HAECs.
Related Concept Videos
01:20Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
01:38Inflammation