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JoVE Encyclopedia of Experiments
Microbiology
评估无菌 C. elegans 的肠道细菌定植
评估无菌 C. elegans 的肠道细菌定植
Encyclopedia of Experiments
Microbiology
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Encyclopedia of Experiments Microbiology
Evaluating Intestinal Bacterial Colonization in Germ-Free C. elegans

评估无菌 C. elegans 的肠道细菌定植

Protocol
121 Views
03:22 min
October 15, 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

从悬浮在培养基中的无菌成年 秀丽隐杆线虫 开始。

引入测试细菌并孵育。

当蠕虫进食时,细菌进入肠腔并粘附在上皮细胞上。

离心以沉淀蠕虫并去除未摄入的细菌。

重悬于缓冲液中,离心,并去除剩余的未摄入细菌。

加入含有热杀死的大 肠杆菌 的培养基并孵育。

在喂养过程中,热杀死的大 肠杆菌 将未粘附的测试细菌从肠腔中排出并排出。

离心并除去含有排出细菌的上清液。

用缓冲液洗涤,离心,除去上清液。

将蠕虫放在冰上冷却以诱导麻痹,防止进一步摄入。

加入漂白剂溶液并孵育以杀死残留的外部细菌。

取出漂白剂并加入冷缓冲液。

离心并除去上清液以消除残留的漂白剂。

这些蠕虫现在只保留粘附在肠上皮细胞上的活测试细菌,从而能够量化定植。

首先将蠕虫样品重悬于微量离心管中的一毫升 M9TX-01 中。通过离心收集成虫并丢弃上清液。使用相同的离心参数,用一毫升 M9TX-01 冲洗蠕虫两次,用一毫升 M9 蠕虫缓冲液冲洗一次,以尽量减少外部细菌。然后,将每个样品重悬于培养管中的一毫升S培养基和2倍热热杀灭OP50中。将试管在 25 摄氏度下孵育 20 至 30 分钟,以将未粘附的细菌从肠道中排出。

孵育后,用一毫升冷M9TX-01冲洗清除的蠕虫两次,并弃去上清液。将管子放在冰上 10 分钟以麻痹蠕虫。然后,向每个试管中加入一毫升冰冷的 M9 蠕虫缓冲液和无味漂白剂。

将试管在冰上孵育至少 10 分钟,以杀死外部细菌。丢弃漂白剂缓冲液并将试管放回冰中,以防止蠕虫泵送。接下来,向每个试管中加入一毫升冷 M9TX-01,并在迷你离心机中离心五秒钟。将试管放回冰中并除去上清液。重复此步骤一次。

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