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Biology
脊髓切除 术在非洲爪 蟾蝌蚪
脊髓切除 术在非洲爪 蟾蝌蚪
JoVE Journal
Biology
This content is Free Access.
JoVE Journal Biology
Spinal Cord Transection In Xenopus laevis Tadpoles

脊髓切除 术在非洲爪 蟾蝌蚪

Full Text
4,090 Views
05:54 min
December 10, 2021

DOI: 10.3791/63276-v

Paula G. Slater1, Juan Larraín1

1Center for Aging and Regeneration, Facultad de Ciencias Biológicas,P. Universidad Católica de Chile

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Please note that some of the translations on this page are AI generated. Click here for the English version.

Summary

非洲爪蟾 蝌蚪脊髓横断术是一种相关的损伤方法,通过在胸腔水平上完全切断脊髓的横向切口来研究脊髓损伤和再生。

Transcript

该协议允许研究青蛙的脊髓再生。获得的知识可以提供新的见解,以了解人类对脊髓损伤的反应。该协议的主要优点是易于执行伤害,并且与尾巴截肢的范式相比,这种技术更好地模仿了人类发生的事情。

该技术允许挑战再生过程,以更好地了解不同基因,蛋白质,分子和信号通路的参与,从而确定新的治疗靶点,找到产生损伤的正确位置及其延伸是困难的。能够看到这些步骤对于使此过程简单明了且可重复至关重要。受精后三到四周,将蝌蚪放入培养皿中,检查前肢和后肢的形态和外观。

寻找50期动物的以下解剖学特征,刚刚出现并且是球形的前肢,以及突出并且是球形的后肢。手术前,通过将蝌蚪置于0.1倍巴特溶液中的0.02%甲磺酸三卡因中麻醉蝌蚪,并通过将它们颠倒来检查动物是否无反应。要进行脊髓横断手术,使用汤匙和镊子将麻醉的50级蝌蚪背侧朝上放在玻璃培养皿上半部分的湿纱布上。

然后,使用显微切割弹簧剪刀,在胸中水平处对皮肤和背侧肌肉进行切口。对于对照假动物,请确保切口尺寸仅为0.2毫米,不会损伤脊髓。在截面动物中,做第二个0.2毫米的切口以完全切除脊髓。

手术后,将蝌蚪转移到含有500毫升0.1倍Barth溶液的罐中,其中一次青霉素和链霉素的密度为每罐10至12个蝌蚪。在单独的水箱中维护截面并控制假蝌蚪。将蝌蚪保持在20至21摄氏度的温度下枸气。

每隔一天用抗生素更换Barth溶液,直到实验结束。手术后一天开始喂蝌蚪,并消灭死去的动物。对于游泳测定,从内部获得一个带有LED照明的盒子,上面覆盖着透明的聚苯乙烯片,允许光线通过,并在LED盒子上安装摄像头。

然后,将一个直径为15厘米的培养皿放在装满100毫升0.1倍巴特溶液的盒子顶部。在转染后一天,将蝌蚪放入培养皿中,并放置五分钟的适应期。适应后,使用参考软件开始视频跟踪自由游泳行为五分钟。

视频完成后,将蝌蚪移回其水箱。这个具有代表性的点图显示了运动功能随时间推移的恢复情况。体检后五天,蝌蚪在五分钟内平均游出0.7米,游泳能力下降。

该容量随着天数的增加而增加,显示10天后5分钟内平均2.1米,转染后15天后5分钟内平均3.1米。在转染后20天观察到游泳能力完全恢复,平均5分钟内5.7米。游泳平均值可能因每批动物而异。

因此,实验组应始终与各自的对照组进行比较,而不是先前获得的数据。手术后,动物可用于全球分析,包括转录组学,蛋白质组学和代谢组学,以及筛选抑制或促进脊髓再生的化合物,旨在开发新的治疗方法。

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