Anti-Oct4 antibody (ab19857)

ab19857 staining Oct4 in F9 cells treated with trans-retinoic acid (ab120728) The cells were incubated at 37°C for 2 days in media containing different concentrations of ab120728 (trans-retinoic acid) in DMSO, fixed with 4% formaldehyde for 10 minutes at room temperature and blocked with PBS containing 10% goat serum, 0.3 M glycine, 1% BSA and 0.1% tween for 2h at room temperature. Staining of the treated cells with ab19857 (1 µg/ml) was performed overnight at 4°C in PBS containing 1% BSA and 0.1% tween. A DyLight 488 anti-rabbit polyclonal antibody (ab96899) at 1:250 dilution was used as the secondary antibody. Nuclei were counterstained with DAPI and are shown in blue.

Overlay histogram of Oct4 staining in mouse embryonic stem cells using ab19857 at 1:100 dilution. Purple histogram represents negative control (rabbit IgG); green line represents anti-Oct4 antibody (ab19857).

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Oct4 was immunoprecipitated using 0.5mg E14Tg2a whole cell extract, 5µg of Rabbit polyclonal to Oct4 and 50µl of protein G magnetic beads (+). No antibody was added to the control (-).
The antibody was incubated under agitation with Protein G beads for 10min, E14Tg2a whole cell extract lysate diluted in RIPA buffer was added to each sample and incubated for a further 10min under agitation.
Proteins were eluted by addition of 40µl SDS loading buffer and incubated for 10min at 70^oC; 10µl of each sample was separated on a SDS PAGE gel, transferred to a nitrocellulose membrane, blocked with 5% BSA and probed with ab19857.
Secondary: Mouse monoclonal [SB62a] Secondary Antibody to Rabbit IgG light chain (HRP) (ab99697).
Band: 48kDa: Oct4.

ICC/IF image of ab19857 stained Mouse Embryonic Stem cells. The cells were PFA fixed (4% PFA, 20 min) and incubated with the antibody (ab19857, 1µg/ml) for 1h at room temperature. The secondary antibody (green) was Alexa Fluor^® 488 goat anti-rabbit IgG (H+L) used at a 1/1000 dilution for 1h. Image-iT™ FX Signal Enhancer was used as the primary blocking agent, 5% BSA (in TBS-T) was used for all other blocking steps. DAPI was used to stain the cell nuclei (blue).

The large nuclei of the Feeder cells can be seen in the image; ab19857 does not localise to these nuclei. ab19857 can be seen localising to the much smaller nuclei of the Mouse Embryonic Stem cells.

ICC/IF image of ab19857 stained mouse embryonic stem cells. The cells were 4% formalin fixed (10 min) and then incubated in 1%BSA / 10% normal goat serum / 0.3M glycine in 0.1% PBS-Tween for 1h to permeabilise the cells and block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab19857, 1µg/ml) overnight at +4°C. The secondary antibody (green) was Alexa Fluor^® 488 goat anti-rabbit IgG (H+L) used at a 1:00 dilution for 1h. Alexa Fluor^® 594 WGA was used to label plasma membranes (red) at a 1:200 dilution for 1h. DAPI was used to stain the cell nuclei (blue).

The image shows a colony of differentiating Human Embryonic Stem Cells double-stained with anti-Oct4 antibody ab19857 (green) and Sox17 antibody (red). The nuclei of Oct-4-positive undifferentiated hESCs stained bright green. Staining was restricted to the nuclei. Oct4-positive nuclei were Sox17-negative, and vice versa. This antibody can be used as a marker of Oct4-positive undifferentiated Human Embryonic Stem Cells.