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JoVE Encyclopedia of Experiments
Neuroscience
使用光敏染料诱导小鼠大脑中的血凝块形成
使用光敏染料诱导小鼠大脑中的血凝块形成
Encyclopedia of Experiments
Neuroscience
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Encyclopedia of Experiments Neuroscience
Inducing Blood Clot Formation in the Mouse Brain Using a Photosensitive Dye

使用光敏染料诱导小鼠大脑中的血凝块形成

Protocol
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03:31 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

以一只具有颅窗和薄颅层的麻醉小鼠为例,以最小的侵入性实现大脑可视化。

在显微镜下,根据从大血管到小血管的血流识别动脉。

将

光敏染料注射到尾静脉中,通过循环到达大脑。

用光激发染料发出荧光,从而实现血流监测。

增加光强度以诱导凝块形成,称为光血栓形成。

染料吸收高强度光,与氧气反应,产生活性氧,从而损害内皮细胞。

受损的细胞释放介质,导致血小板粘附,启动凝块形成。血液中的纤维蛋白有助于捕获额外的血细胞,形成凝块。

通过

之前染料的积累检测到的凝块会阻碍血液流向大脑。

闭合切口,使用抗生素预防感染,并给予镇痛药以减轻疼痛并允许康复。

将

小鼠置于显微镜下后,在人工脑脊液中以每毫升20毫克制备新鲜的孟加拉玫瑰。过滤器对混合物进行灭菌,实验完成后处理。它必须始终新鲜使用。

现在,在用 561 纳米激光扫描颅窗的同时,通过尾静脉注入 0.1 的混合物。在 5 秒内,应该很容易在颅脉管系统中看到染料。注入足够的染料后,选择一个 40 至 80 微米的血管进行血栓形成。动脉可以根据较大血管到较小血管的流量来区分动脉和静脉,反之亦然。

现在,准备对所选容器进行激光照射。将停留时间增加到适合所用系统的任何时间。将激光功率提高到 100%,并将图像采集设置为每秒一帧,扫描速度最大。扫描鼠标,直到形成订书钉凝块。通常这大约需要五分钟。理想情况下,只需扫描一个视野即可形成凝块。相应地选择目标。如果没有形成凝块,请尝试使用更多染料。

一旦

凝块形成,将鼠标从成像区域取出,准备在解剖显微镜下完成手术。首先,在检查是否有出血的同时小心地取下戒指。如果发生任何出血,则必须终止实验。

接下来,使用 6-0 缝合线,闭合切口。然后,在切口线上涂抹抗生素。为了缓解疼痛,皮下注射丁戊二烯三天。第一次注射丁甲酸后,将小鼠放入恢复室中并监测它,直到它可以走动。然后,将其放回应清洁的家笼子中。纵向成像在文本协议中有详细说明。

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