Dabigatran etexilate (DE), a direct-acting, oral inhibitor of thrombin, significantly reduces the risk of stroke compared with traditional anticoagulants, without increasing the risk of major bleeding. However, studies on the fate of cerebral tissue after ischemic stroke in patients receiving DE are sparse and the role of dabigatran-mediated reduction of thrombin in this context has not yet been investigated. Here, we investigated whether pretreatment with DE reduces thrombin-mediated pro-inflammatory mechanisms and leakage of the blood-brain barrier (BBB) following ischemic stroke in rats. Male Wistar rats received DE (15 mg/kg) or a vehicle solution 1 hour before transient middle cerebral artery occlusion (tMCAO) for 90 minutes. Infarct volume, neurologic outcome and intracranial hemorrhage (ICH) were determined after tMCAO. Thrombin generation was indirectly assessed by measuring thrombin/antithrombin III complex. Microvascular patency was evaluated histologically. Cytokine expression and immunoreactivity of cluster of differentiation (CD) 68 were examined to characterize inflammatory processes after pretreatment with DE. BBB integrity was examined by quantifying brain edema. Rats given DE revealed a significant reduction in infarct size without an increase in ICH and significant recovery of neurologic deficits compared to controls. Administration of DE decreased thrombin generation and thrombus formation, dampened the CD68-immunoreactivity and attenuated pro-inflammatory cytokine expression in the cerebral parenchyma ipsilateral to the ischemic lesion. BBB permeability was unaltered following treatment with DE. In summary, prophylactic anticoagulation with DE improves stroke outcome by reducing thrombin-induced inflammation and thrombus formation without increasing the rate of ICH.

译文

达比加群酯 (DE) 是一种直接作用的口服凝血酶抑制剂,与传统抗凝剂相比,可显着降低中风的风险,而不会增加大出血的风险。然而,关于接受DE的缺血性卒中患者脑组织命运的研究很少,达比加群介导的凝血酶减少在这种情况下的作用尚未得到研究。在这里,我们研究了DE预处理是否可以减少大鼠缺血性中风后凝血酶介导的促炎机制和血脑屏障 (BBB) 的泄漏。雄性Wistar大鼠在短暂性大脑中动脉闭塞 (tMCAO) 90分钟前1小时接受DE (15 mg/kg) 或赋形溶液。tMCAO后确定梗塞体积,神经系统结果和颅内出血 (ICH)。通过测量凝血酶/抗凝血酶III复合物间接评估凝血酶的产生。组织学评估微血管通畅性。检查了细胞因子表达和分化簇 (CD) 68的免疫反应性,以表征用DE预处理后的炎症过程。通过量化脑水肿来检查BBB完整性。与对照组相比,给予DE的大鼠显示梗死面积显着减少,而ICH却没有增加,神经功能缺损也明显恢复。施用DE可减少凝血酶的产生和血栓形成,抑制CD68-immunoreactivity并减弱缺血性病变同侧脑实质中促炎性细胞因子的表达。用DE处理后,BBB渗透性没有改变。总之,DE预防性抗凝可通过减少凝血酶诱导的炎症和血栓形成而不增加ICH的发生率来改善卒中结局。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录