超声联合微气泡开放大鼠血脑屏障的实验研究

摘要

目的 探讨超声联合微气泡开放大鼠血脑屏障的安全性及有效性.方法 经大鼠尾静脉注射微气泡声诺维,同时采用GE Vivid 7超声辐射大鼠头颅,辐射深度经磁共振(MRI)扫描辅助定位于基底节区；以MRI增强扫描和荧光显微镜观察伊文思蓝的方法来检测血脑屏障开放程度,苏木素伊红(HE)染色观察细胞形态检测实验的安全性.结果 超声联合微气泡辐射大鼠头颅后,在MRI增强扫描T1W1上观察到辐射区域信号增强,荧光显微镜下观察到辐射区域伊文思蓝的红色荧光；HE染色细胞形态正常,结构完整.结论 超声联合微气泡可靶向、无创地开放大鼠血脑屏障,为中枢神经系统疾病的药物和干细胞治疗提供了新途径.%Objective To explore the safety and effectiveness of diagnostic ultrasound associated with microbubbles to open the blood brain barrier(BBB).Methods Microbubbles were injected through caudal vein,the rat head was radiated by GE Vivid 7 diagnostic ultrasound immediately.The radiated depth was located in the basal ganglia assisted by magnetic resonance imaging(MRI)scanning.The degree of BBB opening was evaluated by enhanced MRI and Evans blue dyeing.The safety was inspected by observation of cell morphology under hematoxylin eosin(HE)staining.Results After the rat head radiated by diagnostic ultrasound with microbubbles,signal enhancement of the radiated area was observed on post contrast T1-weighted images.Red fluorescence of Evans blue was detected by fluorescence microscope in the same area.Normal cellular morphology and structural integrity were showed by HE staining.Conclusions The BBB of rat could be opened targetedly and noninvasively by diagnostic ultrasound associated with microbubbles.This may provide a new strategy for the drugs and stem cells treatment in the central nervous system diseases.