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After collecting rat brain tissue from the animal room, should it be placed in liquid nitrogen first or soaked in Trizol first for preservation? Does this affect RNA integrity?

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Asked by:Tube 2026-06-16 Views 231 4 answers
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All Answers4
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赵阳超 2026-09-12
样品量大时建议统一流程,不要一部分Trizol一部分液氮,避免批间差异。做法是RNase-free冻存管事先编号,取材后快速分块,小块液氮速冻,当天来不及就全液氮,后续统一研磨。若条件有限,也可用RNAlater替代Trizol浸泡,4℃过夜后转-80℃,但脑组织渗透慢,需切成2-3mm小块。保存方式影响下游qPCR或转录组,值得花一次预实验确认。
M
MarkPCR4635 2026-09-22
液氮速冻后-80℃保存是脑组织RNA的常用方式,前提是取材快、切块小,避免反复冻融。提RNA时不要室温解冻,直接带液氮研磨或加Trizol低温匀浆。直接丢Trizol 4℃保存几天,短期可以抑制RNase,但脑组织整块浸泡时内部可能没充分接触Trizol,存在局部降解风险。脂肪含量高的脑组织长时间泡在Trizol里,后续分相也容易浑浊。
K
Kit4137 2026-09-15
两种方式差异可以用预实验评估。我们曾比较大鼠皮层,液氮组RIN多在8以上,Trizol 4℃浸泡24h组RIN多在7左右,28S/18S尚可,但泡到3天以上完整度会下降。建议取同一脑区,分液氮、Trizol 4℃、Trizol -20℃三组,提RNA后跑胶或测RIN。用数据决定正式样本,比只听经验更稳。
R
ResearchZone6756 2026-07-22
直接Trizol浸泡不是完全不行,但不建议作为几天的默认保存。若必须这样,把脑区切成≤2mm小块,使Trizol能渗透,并放-20℃保存,第二天或隔天尽快匀浆。4℃放几天通常不如-20℃。样品量大时,分批处理比整瓶泡着更可靠,因为瓶内温度不易均匀。提取前如果看到组织块完整,需补加Trizol重新匀浆。
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