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JoVE Encyclopedia of Experiments
Neuroscience
在小鼠模型中模拟重复性脑震荡头部损伤
在小鼠模型中模拟重复性脑震荡头部损伤
Encyclopedia of Experiments
Neuroscience
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Encyclopedia of Experiments Neuroscience
Modeling Repetitive Concussive Head Injuries in a Mouse Model

在小鼠模型中模拟重复性脑震荡头部损伤

Protocol
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04:13 min
July 8, 2025
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Please note that some of the translations on this page are AI generated. Click here for the English version.

Transcript

首先将冲击尖端和探头尖端连接到冲击装置。

接下来,将麻醉的小鼠固定在立体定位框架中。

将冲击尖端放置在额叶缝合线和羔羊缝线之间,与耳朵之间的假想水平线垂直对齐。

将立体定位控制面板上的 X 和 Y 通道归零,以防止在切换尖端时撞击中心偏移。

手动将探头尖端移动到冲击中心,然后将其降低以接触冲击部位。将接触式传感器夹在鼠标的尾部。

将 Z 通道归零,然后重新定位冲击尖端,直到 X 和 Y 为零并且 Z 读数为负 4。

以特定速度施加冲击。

测量呼吸暂停(从撞击到小鼠第一次呼吸的时间)以确定损伤严重程度。

允许鼠标恢复。

按指定的时间间隔重复冲击。反复撞击会使大脑中的血管破裂,导致微出血并触发星形胶质细胞激活,模仿轻微的类人脑震荡。

首先将定制的硅橡胶涂层金属尖端连接到电磁立体定位冲击装置上。注意涂层尖端的平底与冲击装置探头尖端的表面平行。接下来,将麻醉的小鼠俯卧位放在加热垫上,并确认对脚趾捏没有反应。

然后,用毛发修剪器彻底剃掉头部,并在动物的眼睛上涂抹药膏。当动物准备好后,在控制箱上将冲击装置的速度预设为每秒 4 米,停留时间为 240 毫秒。在动物的身体下方放置一个柔软的加热垫,使体温保持在 39 摄氏度附近。

然后,使用钝端耳杆将鼠标安装在立体定向框架中,俯卧位。使用 z 驱动器降低靠近鼠标头部的冲击尖端。将 x 和 y 驱动器移动到目标坐标的中间,矢状缝合线上方,以调整直径为 9 毫米的扁平冲击尖端。

注意冲击尖端的一个边缘垂直平行于两只耳朵之间绘制的假想水平线。要正确设置冲击深度,首先将数字立体定位控制面板上的 x 和 y 通道设置为零,以确保切换尖端后冲击中心没有偏移。

然后,将额外的探针尖端移动到小鼠大脑的撞击部位。手动调整 x 和 y 驱动器,将探头尖端移动到撞击区域的中心,并将接触传感器夹在尾部。使用 z 驱动器向下移动冲击器,直到探头尖端接触撞击部位的表面,并将立体定位控制面板上的 z 通道设置为零。

然后,使用 x 和 y 驱动器手动将冲击尖端移回冲击区域,直到 x 和 y 驱动器为零。然后,向下移动 z 驱动器,直到显示 z 驱动器的控制面板为负 4.00。并移动控制箱上的缩回开关以缩回执行器。

现在,点击控制盒上的冲击开关,触发变形深度为4毫米的冲击,并使用计时器测量从冲击到鼠标第一次呼吸的时间。然后,将动物转移到温暖的垫子上,并进行监测,直到它完全恢复。

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