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JoVE Encyclopedia of Experiments
Biology
双光子激光轴索切开术:一种损伤斑马鱼胚胎轴突并观察轴突恢复的方法
双光子激光轴索切开术:一种损伤斑马鱼胚胎轴突并观察轴突恢复的方法
Encyclopedia of Experiments
Biology
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Encyclopedia of Experiments Biology
Two-Photon Laser Axotomy: A Method to Injure Axons in Zebrafish Embryos and Observe Axonal Recovery

双光子激光轴索切开术:一种损伤斑马鱼胚胎轴突并观察轴突恢复的方法

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03:24 min
April 30, 2023
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- 将感兴趣的胚胎放入苯硫脲、PTU、林格氏液中,以抑制色素形成,受精后 24 小时开始。这使得显影的解剖结构更加明显,这对于此过程是必需的。将三卡因麻醉胚胎转移到成像室中。将载玻片放在顶部并在显微镜下观察。专注于要受伤的轴突,这在 488 纳米激光下可见,因为它转基因表达 GFP。

拍摄网站的 before image。接下来,用 910 纳米激光观察轴突,使 GFP 发出红色荧光。增加该激光的强度以伤害目标区域,而不影响周围组织。这个过程称为轴索切开术。用第一台激光拍摄新图像以确认轴索切断术,轴索切开术表现为散落的碎片。在以下协议中,我们将使用双光子激光对斑马鱼胚胎中的外周感觉轴突进行轴切术。

- 如果您的实验室没有定制的双光子示波器,也可以使用蔡司 510 共聚焦双光子显微镜来切断轴突。我们首先将安装好的胚胎放在载物台上,并使用 25 倍水物镜将其聚焦。接下来,在多轨设置中打开两个光子和氩激光器,以便可以从一个激光器切换到另一个激光器。

虽然两种激光器都用于检测 GFP,但为了区分两者,两个光子发射用红色可视化,氩激光发射用绿色可视化。使用氩激光识别要受伤的轴突。在 Z 设置下,标记第一个和最后一个光学切片,拍摄共聚焦图像,并创建 Z 堆栈的最大投影。

关闭氩激光器并打开双光子激光器。以大约 9% 的透射强度进行扫描,以确保轴突仍然清晰对焦。点击 Stop 停止 按钮,以便 裁剪 工具将可用。使用 Crop 放大感兴趣的区域。通常我们放大到 70 倍左右。选择要受伤的轴突区域,并将该区域聚焦。可以在 模式 标签。

接下来,在 Channels 选项卡下,将两个光子的强度从大约 9% 的透射更改为 15% 到 30% 的透射。要激活新设置,请单击 Fast XY 按钮,然后单击 Stop 停止 之后快速以避免过度损坏。如果手术有效,轴突应被视为分散的碎片。最后,为了确保轴突确实受损,请切换回 488 纳米氩激光器。拍摄另一个共聚焦图像并创建 Z 堆栈的最大投影。

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