固定・透過処理したサンプルでアポトーシスの確認をしたい。 どの試薬がおすすめか? 蛍光標識 Annexin V は使用できるか?
固定後のサンプルでの Annexin V の使用はお勧めできません。 ホルムアルデヒドによる架橋により、ホスファチジルセリンもマスクされる可能性があるためです。 固定後のサンプルで使用できるアポトーシス検出方法は、anti-Caspase抗体を用いた免疫染色、もしくは、 Click-iT® TUNEL Imaging Kit などの TUNEL法です。
What is the fluorescence excitation and emission maxima of Alexa Fluor 647 dye?
Alexa Fluor 647 has an excitation/emission maxima of 650/670 nm.
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I will be performing a cell proliferation assay using Click-iT EdU kit. At what point can I stop overnight, or do I have to perform all the steps continuously?
One may store the sample after fixation overnight in PBS at 4oC. For longer storage (<1 week) , store in buffer with 1-2% formaldehyde or in formalin to limit microbial growth. If you use sodium azide as a microbial inhibitor, it must be completely removed prior to the Click-iT reaction.
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I need to test cells for apoptosis after they have been formaldehyde-fixed and permeabilized. What dye or conjugate do you recommend? Will Annexin V conjugates work?
We do not recommend Annexin V for post-fix labeling, since fixation inactivates the function of the translocase; fixed samples would show mostly uniform labeling with Annexin V. The only options you have for apoptosis assays after fixation are to use an anti-caspase antibody or perform a TUNEL assay, such as with the Click-iT TUNEL Imaging kits.
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Can I use Click-iT Plus TUNEL Assay Kits for In Situ Apoptosis Detection (Cat. Nos. C10617, C10618, C10619) for whole mount immunofluorescence staining of zebrafish larvae?
Yes. The Click-iT Plus TUNEL Assay Kits for In Situ Apoptosis Detection (Cat. Nos. C10617, C10618, C10619) is optimized for use with tissues and should work on zebrafish larvae, although it has not been internally validated with zebrafish larvae.
Find additional tips, troubleshooting help, and resources within our Cell Viability, Proliferation, Cryopreservation, and Apoptosis Support Center.