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Isoflurane reduces the ischemia reperfusion injury surge: A longitudinal study with MRI

机译:异氟烷减少缺血再灌注损伤的浪涌:MRI的纵向研究

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Background: Recent studies show neuroprotective benefits of isoflurane (ISO) administered during cerebral ischemia. However, the available studies evaluated cerebral injury only at a single time point following the intervention and thus the longitudinal effect of ISO on. ischemic tissues remains to be investigated. Objectiue: The objective of the present study was to investigate the longitudinal effect of ISO treatment in counteracting the deleterious effect of ischemia by evoking the transcription factor, hypoxia inducible factor-1 (HIF-1), and vascular endothelial growth factor (VEGF). Methods: Focal cerebral ischemia was induced in 70 rats by filament medial cerebral artery occlusion (MGAo) method. MCAo rats were randomly assigned to control (90 min ischemia) and MCAo+ISO (90 min ischemia+2% ISO) groups. Infarct volume, edema, intracerebrai hemorrhage (ICH), and regional cerebral blood flow (rCBF) were measured in eight in uivo sequential MR imaging sessions for 3 weeks. Western blot analysis and immunofiuorescence were used to determine the expression level of HIF-1alpha (the regulatable subunit of HIF-1) and VEGF proteins. Results: ISO inhalation during ischemia significantly decreased the surge of infarct volume, edema, ICH, and reduced the mortality rate (p<0.01). ISO transiently altered the rCBF, significantly enhanced the expression of HIF-1alpha and VEGF, and decreased the immune cell infiltration. Locomotor dysfunction was ameliorated at a significantly faster pace, and the benefit was seen to persist up to three weeks. Conclusion: Treatment with ISO during ischemia limits the deadly surge in the dynamics of ischemia reperfusion injury with no observed long-term inverse effect.
机译:背景:最近的研究表明异氟烷(ISO)在脑缺血期间给予神经保护作用。但是,现有研究仅在干预后的单个时间点评估了脑损伤,因此评估了ISO对纵向损伤的影响。缺血组织仍有待研究。目的:本研究的目的是通过唤起转录因子,缺氧诱导因子-1(HIF-1)和血管内皮生长因子(VEGF)来研究ISO治疗在抵消缺血的有害作用方面的纵向作用。方法:采用细丝内侧脑动脉阻塞法(MGAo)诱导70只大鼠局灶性脑缺血。将MCAo大鼠随机分为对照组(90分钟缺血)和MCAo + ISO(90分钟缺血+ 2%ISO)组。在连续3周的uivo连续MR成像会议中,对八次测量梗死体积,水肿,脑内出血(ICH)和局部脑血流量(rCBF)。使用蛋白质印迹分析和免疫荧光测定HIF-1alpha(HIF-1的可调节亚基)和VEGF蛋白的表达水平。结果:缺血期间吸入ISO可以显着降低梗死体积,水肿,ICH的发生率,并降低死亡率(p <0.01)。 ISO瞬时改变了rCBF,显着增强了HIF-1alpha和VEGF的表达,并减少了免疫细胞的浸润。运动功能障碍的改善速度明显加快,并且观察到的益处持续了三周。结论:局部缺血期间使用ISO进行治疗可限制局部缺血再灌注损伤动力学的致命增加,而未观察到长期的逆作用。

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