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Pravastatin acute neuroprotective effects depend on blood brain barrier integrity in experimental cerebral ischemia

机译:普伐他汀急性神经保护作用依赖于实验性脑缺血中的血脑屏障完整性

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摘要

Statins have since long been reported to exert acute neuroprotection in experimental stroke models. However, crucial questions still need to be addressed as far as the timing of their cerebral effects after intravascular administration and the role played by the blood brain barrier (BBB) crossing properties. We tested the effects of an hydrophilic statin (pravastatin, 100 nM), which poorly crosses BBB under physiological conditions. Pravastatin was administered either 90 min before or immediately after transient middle cerebral artery occlusion in the in vitro isolated guinea pig brain preparation. A multi-modal outcome assessment was performed, through electrophysiological and cerebral vascular tone recordings, MAP-2 immunohistochemistry, BBB evaluation via ZO-1/FITC-albumin analysis, AKT and ERK activation and whole-cell antioxidant capacity. Pravastatin pre-ischemic administration did not produce any significant effect. Pravastatin post-ischemic administration significantly prevented MAP-2 immunoreactivity loss in ischemic areas, increased ERK phosphorylation in the ischemic hemisphere and enhanced whole-cell antioxidant capacity. Electrophysiological parameters, vascular tone and AICT signaling were unchanged. In all tested ischemic brains, ZO-1 fragmentation and FITC albumin extravasation was observed, starting 30 min from ischemia onset, indicating loss of BBB integrity. Our findings indicate that the rapid anti-ischemic effects of intravascular pravastatin are highly dependent on BBB increased permeability after stroke. (C) 2015 Elsevier B.V. All rights reserved.
机译:据报道,他汀类药物以来已经举报了实验中风模型中的急性神经保护作用。然而,尽管血管内给药后脑效应的时间及其作用仍然需要解决至关重要的问题,并且血脑屏障(BBB)交叉特性的作用。我们测试了亲水性他汀类药物(普伐他汀,100nm)的效果,在生理条件下越差地交叉BBB。在体外分离的豚鼠脑饲料中的瞬时中脑动脉闭塞之前或之后普伐他汀90分钟给药。通过电生理和脑血管间调记录,MAP-2免疫组化,通过ZO-1 / FITC-白蛋白分析,AKT和ERK活化和全细胞抗氧化能力进行多种模拟结果评估。普伐他汀预缺血管理没有产生任何显着效果。普伐他汀后缺血管理显着防止了缺血地区的地图-2免疫反应性损失,缺血半球中的ERK磷酸化增加,增强了全细胞抗氧化能力。电生理参数,血管间调和避免信号不变。在所有测试的缺血性大脑中,观察到ZO-1碎片和FITC白蛋白外渗,从缺血发作开始30分钟,表明BBB完整性的损失。我们的研究结果表明,血管内普伐他汀的快速抗缺血作用高度依赖于中风后的BBB增加的渗透性。 (c)2015 Elsevier B.v.保留所有权利。

著录项

  • 来源
    《Brain research》 |2015年第null期|共11页
  • 作者单位

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Fdn Ist Neurol C Besta Unit Expt Epileptol &

    Neurophysiol Milan Italy;

    Fdn Ist Neurol C Besta Unit Expt Epileptol &

    Neurophysiol Milan Italy;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Fdn Ist Neurol C Besta Unit Expt Epileptol &

    Neurophysiol Milan Italy;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

    Univ Milano Bicocca Dept Surg &

    Interdisciplinary Med Milan Ctr Neurosci Lab Expt Stroke Res I;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 神经病学;
  • 关键词

    Acute stroke; Statin; Neuroprotection; Blood brain barrier; Intravascular administration;

    机译:急性卒中;他汀类;神经保护;血脑屏障;血管内给药;

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