Role of acid sphingomyelinase in the modulation of coagulation after traumatic brain injury

项目摘要 创伤后凝血功能的改变与静脉血栓栓塞事件有关， 创伤性脑损伤后并发症血小板过度聚集和微粒生成 在这种持续性凝血障碍的发展中发挥作用。酸性鞘磷脂酶活性可能有助于 对血小板功能和微粒产生的影响。我们的初步数据表明， 创伤性脑损伤导致血小板聚集、酸性鞘磷脂酶 活性、神经酰胺浓度和随后产生的高凝性血小板源性 该提案的总体目标是证明酸性鞘磷脂酶的变化 活性改变血小板功能和微粒生成，导致高凝状态， 创伤性脑损伤后血栓栓塞风险，目的如下：目的1：阐明酸 鞘磷脂酶依赖性因子驱动花生四烯酸诱导的血小板功能变化 创伤性脑损伤目的2：确定酸性鞘磷脂酶在调节血小板源性 创伤后炎症因子释放刺激后微粒的产生和功能 脑损伤目的3：确定酸性鞘磷脂酶活性如何调节创伤性脑损伤诱导的 血小板衍生微粒和/或血小板内皮活化。圆满完成这些目标 可能导致新的治疗方法，以减少创伤后血栓栓塞事件。

Project Summary Alterations in the coagulation profile after trauma are associated with venous thromboembolic events and subsequent morbidity after traumatic brain injury. Platelet hyperaggregration and microparticle generation play a role in the development of this ongoing coagulopathy. Acid sphingomyelinase activity may contribute to both platelet function and microparticle production. Our preliminary data have demonstrated that traumatic brain injury results in time-dependent changes in platelet aggregation, acid sphingomyelinase activity, ceramide concentration, and subsequent generation of hypercoagulable platelet-derived microparticles.The overall goal of this proposal is to demonstrate that changes in acid sphingomyelinase activity alter platelet function and microparticle generation, leading to hypercoagulability and thromboembolic risk after traumatic brain injury, with the following aims: Aim 1: Elucidate acid sphingomyelinase-dependent factors driving arachidonic acid-induced changes in platelet function following traumatic brain injury. Aim 2: Determine the role of acid sphingomyelinase in modulating platelet-derived microparticle generation and function after stimulation by proinflammatory factors released by traumatic brain injury. Aim 3: Determine how acid sphingomyelinase activity regulates traumatic brain injury-induced platelet-derived microparticle and/or platelet endothelial activation. Successful completion of these aims may lead to novel therapies to reduce posttraumatic thromboembolic events.