EA3064-GIMAP, Université de Lyon, 42023, Saint-Etienne, France.
Laboratoire des Agents Infectieux et d'Hygiène, CHU de Saint-Etienne, 42055, Saint-Etienne, France.
Sci Rep. 2017 Jul 17;7(1):5610. doi: 10.1038/s41598-017-06024-2.
Beyond their hemostatic functions, platelets alter their inflammatory response according to the bacterial stimulus. Staphylococcus aureus is associated with exacerbated inflammation and thrombocytopenia, which is associated with poor prognosis during sepsis. Acetylsalicylic acid and statins prevent platelet aggregation and decrease the mortality rate during sepsis. Therefore, we assessed whether these two molecules could reduce in vitro platelet activation and the inflammatory response to S. aureus. Platelets were exposed to clinical strains of S. aureus in the presence or absence of acetylsalicylic acid or fluvastatin. Platelet activation, aggregation, and release of soluble sCD62P, sCD40 Ligand, RANTES and GROα were assessed. Platelet cell death was evaluated by analyzing the mitochondrial membrane potential, phosphatidylserine exposure, platelet microparticle release and caspase-3 activation. All S. aureus strains induced platelet activation but not aggregation and decreased the platelet count, the expression of cell death markers and the release of RANTES and GROα. Acetylsalicylic acid but not fluvastatin limited platelet activation and inflammatory factor release and restored the platelet count by protecting platelets from Staphylococcus-induced expression of cell death markers. This study demonstrates that acetylsalicylic acid limits S. aureus-induced effects on platelets by reducing cell death, revealing new strategies to reduce the platelet contribution to bacteremia-associated inflammation.
除了止血功能外,血小板还根据细菌刺激改变其炎症反应。金黄色葡萄球菌与炎症加重和血小板减少症有关,这与脓毒症期间的预后不良有关。乙酰水杨酸和他汀类药物可预防血小板聚集并降低脓毒症期间的死亡率。因此,我们评估了这两种分子是否可以减少体外血小板激活和金黄色葡萄球菌的炎症反应。在存在或不存在乙酰水杨酸或氟伐他汀的情况下,将血小板暴露于临床金黄色葡萄球菌株中。评估血小板活化、聚集和可溶性 sCD62P、sCD40 Ligand、RANTES 和 GROα 的释放。通过分析线粒体膜电位、血小板磷脂酰丝氨酸暴露、血小板微粒释放和 caspase-3 激活来评估血小板细胞死亡。所有金黄色葡萄球菌株均诱导血小板活化,但不诱导聚集并降低血小板计数、细胞死亡标志物的表达以及 RANTES 和 GROα 的释放。乙酰水杨酸但不是氟伐他汀可限制血小板活化和炎症因子释放,并通过保护血小板免受金黄色葡萄球菌诱导的细胞死亡标志物表达来恢复血小板计数。这项研究表明,乙酰水杨酸通过减少细胞死亡来限制金黄色葡萄球菌对血小板的影响,揭示了减少血小板对菌血症相关炎症贡献的新策略。
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