血小板
炎症体
菲拉明
医学
酪氨酸磷酸化
细胞生物学
血小板糖蛋白GPIb-IX复合物
血管性血友病因子
磷酸化
止血
血小板活化
免疫学
化学
内科学
生物化学
生物
细胞骨架
炎症
细胞
作者
Hu Hu,Xiaoyan Chen,Jingke Li,Pu Liao,Yangfan Zhou,Tongtong Zhang,Li Li,Jingqi Shi,Xin Deng,Sheng Yan,Wei Chen,Di Wang
出处
期刊:Thrombosis and Haemostasis
[Georg Thieme Verlag KG]
日期:2024-02-07
摘要
Introduction Platelets bridge thrombosis and inflammation, but how platelets use the endogenous intraplatelet inflammatory machinery is less well understood. NACHT, LRR, and PYD domain-containing protein 3 (NLRP3) is best known as the central component of the interleukin (IL)-1-producing inflammasome. Unveiling a cell type-specific mechanism of NLRP3 in platelets may improve our understanding of thrombotic diseases. Methods Ferric chloride-induced mesenteric arteriole thrombosis, tail bleeding models and microfluidic whole-blood perfusion were used to assess thrombosis and hemostasis. Additionally, we utilized aggregometry, flow cytometry, immunoprecipitation and western blot to investigate glycoprotein (GP) Ib-IX mediated platelet function and signaling. Results Our findings revealed that NLRP3-/- mice displayed severely impaired thrombosis and hemostasis, whereas apoptosis-associated speck-like protein containing a CARD (ASC)-/-, caspase-1-/-, or Nlrp3A350V/+CrePF4 mice did not exhibit such impairment. Subsequently, NLRP3-/- platelets exhibit reduced adhesion to injured vessel walls and collagen and impaired von Willebrand factor (vWF)-dependent translocation and rolling behavior. NLRP3 deficiency decreased botrocetin-induced aggregation and the phosphorylation of key signaling molecules in the GPIb-IX pathway. Mechanistically, diminished cAMP/PKA activity led to reduced phosphorylation of the Ser291 site on NLRP3, thereby enabling an NLRP3-filamin A interaction. This interaction accelerated the dissociation of filamin A from GPIbα, which allowed the 14-3-3ζ-dependent upregulation of GPIb-IX affinity to vWF. Finally, platelet NLRP3 largely regulated thrombotic disease models such as stroke and deep vein thrombosis. Conclusion NLRP3 promoted the function of the major platelet adhesion receptor GPIb-IX without involving NLRP3 inflammasome assembly or IL-1β.
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