Encyclopedia of Experiments: Biology
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-当可视化脂质液滴时,中性脂质的细胞内储存细胞器首先在样品中加入洗涤剂溶液,例如含有 Triton X-100 的溶液。这将渗透到蠕虫的细胞中。接下来,将样品固定在适当浓度的异丙帕诺中,例如 40%。
然后,在样品中加入尼罗河红,并保护它免受光线的照射,因为染料对光线敏感。 固定允许染料进入整个动物的脂质液滴。尼罗河红是一种嗜脂染料,其荧光发射谱取决于当地脂质环境的极性。
当暴露在极性脂质(如磷脂)中时,尼罗河红的发射光谱处于较高的红色波长。当暴露在脂质液滴中性核心的三氯二醇和固醇酯酯中时,尼罗河红的发射光谱会转移到较低的黄金波长。
因此,使用荧光显微镜的绿色通道,收集黄金波长的排放物,可视化尼罗河红染色整个动物的脂质液滴。在示例协议中,我们将看到尼罗河红染色程序,并在固定样品中对脂质液滴进行成像。
- 进行尼罗河红脂染色,板虫线虫生长介质,或NGM,播种晚日志OP50大肠杆菌,并在20摄氏度到L4早期生长蠕虫。用1毫升PBST溶液清洗蠕虫,并将蠕虫悬架转移到1.5毫升微胶管。
以560倍重力对蠕虫进行一分钟的离心处理,然后去除超细剂,重复PBST洗涤,直到大肠杆菌从悬架中清除。接下来,在蠕虫颗粒中,加入100微升的40%异丙酚,或60%用于ORO染色,并在室温下孵育样品3分钟。
- 添加异丙帕诺对染色前蠕虫的适当渗透至关重要。
- 以 560 倍重力对蠕虫进行离心,并在不破坏蠕虫颗粒的情况下去除超母体。
-在离心过程中尽量减少光线照射非常重要。
- 现在,在黑暗中,向每个样品添加600 微升以前准备好的 NR 工作解决方案。将管子倒置三次,并完全混合蠕虫和溶液。然后在室温下在黑暗中孵化样品两个小时。
孵化后,将蠕虫离心并去除超细剂。然后加入600微升PBST,在黑暗中孵化样品30分钟,去除多余的NR污渍。在像以前一样再次旋转样品后,除大约50微升的超自然分子之外,全部去除。
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