Autophagy assay cell type - U2OS (human bone osteosarcoma epithelial cells)

As autophagy is a multi-step process which includes not just the formation of autophagosomes, but most importantly, flux through the entire system, including the degradation upon fusion with lysosomes, which makes it quite challenging for detection. There are several methods for detection in mammalian cells, including immunoblotting analysis of LC3 and p62 and detection of autophagosome formation/maturation by fluorescence microscopy, Currently, there is no single “gold standard” for determining the autophagic activity that is applicable in every experimental context, hence it is recommended to go for the combined use of multiple methods to accurately assess the autophagic activity in any given biological setting.

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Found 4 matching solutions for this experiment

Atg5 (D5F5U) Rabbit mAb

Cell Signaling Technology

Upstream tips
U2OS cells were lysed in 10 mM KPO4, 1 mM EDTA, 10 mM MgCl2, 5 mM EGTA, 50 mM bis-glycerophosphate, 0.5% NP40, 0.1% Brij35, 0.1% sodium deoxycholate, 1 mM NaVO4, 5 mM NaF, 2 mM DTT, and complete protease inhibitors (Sigma, P8340-5ML).
Protocol tips
Proteins were resolved by SDS-PAGE, transferred to PVDF (for low molecular weight proteins like LC3) or nitrocellulose membranes, blocked with 4% w/v non-fat dry milk in 1x TBS-T (TBS with 0.05% Tween 20), and probed with primary antibodies in blocking buffer at 4°C overnight followed by secondary antibodies in blocking buffer for 45 minutes at room temperature.
Downstream tips
Proteins were detected by chemiluminescence using ECL (100 nM Tris, pH 6.8, luminol (1.25 mM), p-coumaric acid (198 μM), H2O2 (0.009%)) or SuperSignal West Femto maximum sensitivity substrate (Thermo Fisher, 34095).
Upstream tips
250 µL of the diluted Cyto-ID® green stain solution was added to each sample and mixed well instead of 100ul
Protocol tips
Use Cyto-ID green dye (1 μl/4 ml assay buffer) for 30 minutes in dark at RT.
Downstream tips
Incase of Low CYTO-ID Green dye staining in all treatments, increase the reagent concentration (500X dilution of the dye is recommended) and the incubation time.

Incase of High CYTO-ID Green staining, it could be that the cell culture medium was depleted of nutrients and so change media 4-8 hours before the experiment
Protocol tips
Primary Ab dilution-1:1000 dilution
LC3B (D11) XP® Rabbit mAb

Cell Signaling Technology

Protocol tips
Primary Ab dilution-1:200 dilution
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