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When primarily isolating mouse embryonic fibroblasts, how should the trypsin concentration and digestion time be determined?

Lab Techniques
Asked by:KitLab 2026-06-19 Views 206 4 answers
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David8267 2026-09-10
建议先用0.05%胰蛋白酶-EDTA,不要直接上0.25%。8-10个胚胎的剪碎组织泥,我一般加25-30 mL,37℃水浴轻摇10-15分钟;到第8分钟取一点吹打看是否容易散开,没散就继续,但总时长别超过20分钟。含EDTA不是“猛”在酶本身,而是螯合钙镁让细胞间连接变松,用它是可以的,关键是把时间控制短,消化后立刻血清终止。结团多说明组织剪得不够碎或吹打不足,不一定要加酶量。
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Oscar9494 2026-09-14
我比较推荐多轮消化而不是一次到位。组织块加0.05%胰酶/EDTA后37℃放8-10分钟,轻柔吹打,把上层细胞悬液吸到含15%血清的培养基里终止,剩余组织再补新胰酶重复一轮。血清终止必须做,一般按1:1体积加入含10%FBS的DMEM就够了,之后300g离心5分钟洗掉酶。8-10个胚胎第一次加20-25mL,后面每轮看组织量补10-15mL。这样能避免消化过头,也能提高细胞得率。
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Extracting4337 2026-09-24
结团和消化过头常常是同一批操作里两个极端。我现在的做法是:胚胎去头四肢内脏后,用眼科剪剪到1-2mm糊状,加0.05%胰酶/EDTA后先4℃浸10分钟,再37℃5分钟,期间轻轻摇。消化后加DNase I(终浓度约20-50 μg/mL)能减少DNA释放引起的细胞粘团。吹打用10ml吸管,动作轻慢,不要吹出泡沫,然后过70μm筛,能明显改善结团。0.25%如果要用,建议用PBS或DMEM等量稀释后再试。
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Assay 2026-09-19
如果要做MEF原代,我更倾向用不含EDTA的0.05%胰蛋白酶,37℃ 15分钟以内,组织块量少时容易控制。含EDTA的胰酶对贴壁传代好用,但原代组织解离时EDTA会让消化终点不好判断,时间稍长细胞膜也容易受损。一次处理8-10个胚胎我约加30mL,如果组织块多就分两个50mL离心管,避免堆太厚。终止用血清终浓度10%即可,但建议离心后再用完全培养基洗一次,对后续贴壁影响小。
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