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脑毛细管中培养细胞细胞钙测量和钙成像研究
Chapters
Summary May 27th, 2020
Please note that all translations are automatically generated.
Click here for the English version.
脑毛细管性信号是调节血脑屏障特性和血流的基本参与者。该协议描述了如何分离、培养脑毛细管腹膜,在细胞类型方面进行特征分析,并应用于用荧光探针研究细胞内钙信号。
Transcript
这是一种简单而有效的方法来隔离和培养原脑环状物,用于研究细胞间钙信号。获得的细胞培养物是近同质的中白细胞种群,加载膜状物进行钙成像非常简单。这里描述的方法应该为该领域的其他研究人员提供强大的工具,用于研究腹膜生物学,以及体外腹膜内信号。
首先在37摄氏度的水浴中解冻一小瓶毛细管。毛细管解冻后,将它们转移到具有 30 毫升 DMEM 复合剂的离心管中,并在 500 倍 G 下将其离心 5 分钟,然后从管中取出介质,并在 10 毫升新鲜 DMEM comp 中重新悬挂调色板。将悬浮液转移到涂有涂层的 T-75 烧瓶中,让毛细管在 37 摄氏度的培养箱中粘附在底部 4 到 6 个小时,孵化器提供 10% 的二氧化碳。
孵育后,在光学显微镜下检查烧瓶。毛细管的分馏现在应该附在烧瓶的底部。在播种毛细管后的第四天,在显微镜下检查它们,以确保它们大约为 60 到 70% 的汇合。
吸气介质,用PBS轻轻清洗细胞。加入两毫升解冻的三辛-EDTA,将烧瓶留在培养箱中一至三分钟,经常将烧瓶中取出,用显微镜观察细胞分离。当内皮细胞开始四舍五入时,轻轻敲击烧瓶将其分离。
当细胞分离时,通过向烧瓶中添加 10 毫升 DMEM 复合剂来停止尝试性。用介质冲洗烧瓶几次,并吸入内皮细胞悬浮液,现在可用于其他目的。在烧瓶中加入10毫升DMEM复合物,并在光学显微镜下检查,以确保心状物仍然存在并附着在底部。
然后,将烧瓶放回孵化器,让富含字节的培养者生长。要将膜覆盖的 96 孔板中播种,请将它们分离,如文本手稿中所述。吸气介质,注意不要干扰细胞颗粒,并在一毫升新鲜DMEM复合中重新悬浮颗粒。
使用计数室计算细胞,然后计算每井应添加到每个井的悬浮量,以每井播种 10,000 个细胞。添加细胞悬浮液,然后向细胞添加足够的DMEM复合,以达到每孔200微升的总体积。当准备用 Fura-2 AM 钙指示器染料加载心状物时,将 96 孔板与细胞一起从培养箱中取出,然后从孔中吸出介质。
用测定缓冲液清洗细胞两次,并在每井中加入100微升的装载溶液。用锡箔包裹盘子,以避免照片漂白,并在室温下孵育45分钟,30 RPM摇动。孵育后,吸气缓冲液,用测定缓冲液洗涤细胞两次。
将100微升新鲜剂加入检测缓冲液,让细胞孵育30分钟。孵育后,将板读卡器的温度设置为37摄氏度,将带细胞的96井板转移到样品板位置,然后将带激动剂的试剂板放在试剂板位置。首先测量电池的负载,以确保 Fura-2 AM 在所有孔中负载相等,然后在 340 至 380 纳米时以激发荧光波长进行测量,在 510 纳米时执行发射波长。
加入50微升的激动剂,以150微升/秒的速度,从试剂盘到每一个带细胞的井。将盖板插入电池室,然后拧紧,以避免泄漏。将 DMEM 复合和计算的细胞悬浮量添加到每个腔室中,最终体积为 500 微升。
在37摄氏度和10%的二氧化碳下孵育细胞室6天,或直到汇合。一旦细胞汇合,将细胞室从培养箱中取出,并吸气培养。用测定缓冲液清洗细胞两次,在每个腔室中加入500微升的加载缓冲液,然后在室温下孵育45分钟。
孵育后,吸气缓冲液,用检测缓冲液清洗细胞两次,然后在每个腔室中加入500微升新鲜检测缓冲液,并在室温下再孵育30分钟,使 AM 酯的裂解。用 500 微升新鲜测定缓冲液更换缓冲液,并在共和显微镜下进行实时成像。尽可能轻轻地将细胞室安装在显微镜的舞台上,以避免细胞受到干扰。
将激励波长设置为 488 纳米,发射为 515 纳米,以 5 秒间隔进行 2 分钟顺序图像采集,将 x,y 图像大小设置为 512 x 512 像素。向细胞室添加 300 微升 100 毫摩尔 ATP,然后启动图像采集。该协议用于净化牛脑毛细血管的胸毛。
在九天中,从种子毛细血管中生长的细胞生长被成像出来。毛细管在第一天完全附着在烧瓶上,第二天,内皮发芽是可见的。四天后,细胞外生长明显,内皮细胞通过三位一体机切除。
毛细管的残余物在试鸣后存在,但几天后从烧瓶中消失。去除内皮层后,允许内皮层生长至汇合。第九天,周利群岛达到约80%的汇合,形成岛屿。
将ATP添加到富拉-2加载的环状物导致细胞酸钙水平增加。反应发生在ATP加入过周后,并在测量的时间段缓慢下降。钙反应也测量与实时共体成像。
测量了基线荧光,然后在64秒内加入ATP,细胞内钙反应强烈。不久之后,细胞酸钙在细胞中分体化,细胞面积减少可见。到300秒时,细胞面积大减,荧光几乎降低到基线水平。
这种方法已被用于从原发性脑毛细管腹膜获得第一个细胞内钙测量,表明腹膜通过ATP刺激,并能够在体外收缩。
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