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JoVE Encyclopedia of Experiments
Neuroscience
通过荧光示踪鉴定小鼠视网膜神经节细胞亚型
通过荧光示踪鉴定小鼠视网膜神经节细胞亚型
Encyclopedia of Experiments
Neuroscience
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Encyclopedia of Experiments Neuroscience
Identification of Mouse Retinal Ganglion Cell Subtypes Through Fluorescent Tracing

通过荧光示踪鉴定小鼠视网膜神经节细胞亚型

Protocol
333 Views
03:20 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

将从具有

荧光标记的视网膜神经节细胞或RGC的转基因小鼠中分离的视网膜组织放入记录室中。

视觉信息被传递到 RGC,其轴突通过视神经将其传递到大脑。

RGC 亚型的区别在于其树突的分支模式,树突在视网膜内层内分层成亚层。

压平视网膜组织并使用组织锚固定。

将腔室转移到显微镜载物台上并灌注含氧溶液以维持 RGC 活力。

使用红外照明,识别荧光RGC。

将

含有荧光示踪剂的移液器放在 RGC 上。

施加正压以防止堵塞。

切换到负压,将膜吸入移液器以形成密封。

施加抽吸力以破裂膜,建立全细胞构型,促进示踪剂扩散到树突中。

观察树突形态和分层以识别 RGC 亚型。

在含氧细胞外溶液中洗涤视网膜,并用塑料转移移液器将其转移到玻璃底记录室中。之后,使用镊子小心地将组织压平,感光层朝下。使用移液器去除多余的液体。并使用带有尼龙网的铂环固定组织。然后用含氧细胞外溶液填充腔室并将其安装到显微镜载物台上。用含氧细胞外溶液以每分钟2至4毫升的速度灌注组织。

为了准备此过程,请使用微量移液器拉出一些玻璃微量移液器进行电生理记录。使用IR-DIC光学器件观察神经节细胞层。然后使用约480纳米的落射荧光鉴定GFP加神经节细胞。接下来,在DIC中找到装有细胞内溶液的移液器。施加轻微的正压并将任何电压归零amp升压器上的偏移。

随后,将玻璃微量移液器放在GFP阳性池上,并应用测试电压命令步骤来监测密封阻力。负压应在移液器和细胞膜之间形成千兆欧姆密封。形成稳定的密封后,通过施加短暂的负压脉冲来破裂膜,以获得整个细胞的进入。等待一到两分钟,让细胞的树突充满荧光示踪剂。

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