All lanes : Anti-MRP1 antibody [EPR21062] (ab233383) at 1/1000 dilution

Lane 1 : Wild-type HeLa cell lysate
Lane 2 : ABCC1 knockout HeLa cell lysate
Lane 3 : Wild-type A549 cell lysate
Lane 4 : ABCC1 knockout A549 cell lysate

Lysates/proteins at 20 µg per lane.

Secondary
All lanes : Goat anti-Rabbit IgG H&L (IRDye® 800CW) preadsorbed (ab216773) at 1/20000 dilution

Predicted band size: 171 kDa
Observed band size: 250 kDa why is the actual band size different from the predicted?

Lanes 1-4: Merged signal (red and green). Green - ab233383 observed at 250 kDa. Red - loading control ab7291 observed at 50 kDa.

 ab233383 Anti-MRP1 antibody [EPR21062] was shown to specifically react with MRP1 in wild-type HeLa cells. Loss of signal was observed when knockout cell line ab265256 (knockout cell lysate ab257242) was used. Wild-type and MRP1 knockout samples were subjected to SDS-PAGE. ab233383 and Anti-alpha Tubulin antibody [DM1A] - Loading Control (ab7291) were incubated overnight at 4°C at 1 in 1000 dilution and 1 in 20000 dilution respectively. Blots were developed with Goat anti-Rabbit IgG H&L (IRDye^® 800CW) preadsorbed (ab216773) and Goat anti-Mouse IgG H&L (IRDye^® 680RD) preadsorbed (ab216776) secondary antibodies at 1 in 20000 dilution for 1 hour at room temperature before imaging.

 

ab233383 staining MRP1 in wild-type HeLa cells (top panel) and ABCC1 knockout HeLa cells (ab265256) (bottom panel). The cells were fixed with 4% paraformaldehyde (10 min) then permeabilized with 0.1% Triton X-100 for 5 minutes and then blocked with 1% BSA/10% normal goat serum/0.3M glycine in 0.1% PBS-Tween for 1h. The cells were then incubated with ab233383 at 1/100 dilution and ab7291 (Mouse monoclonal to alpha Tubulin) at 1/1000 dilution overnight at 4°C followed by a further incubation at room temperature for 1h with a goat secondary antibody to rabbit IgG (Alexa Fluor^® 488) (ab150081) at 2 μg/ml (shown in green) and a goat secondary antibody to mouse IgG (Alexa Fluor^® 594) (ab150120) at 2 μg/ml (shown in red). Nuclear DNA was labelled in blue with DAPI.
Image was taken with a confocal microscope (Leica-Microsystems TCS SP8).

Flow cytometry overlay histogram showing wild-type HeLa (green line) and ABCC1 knockout HeLa cells (ab265256) stained with ab260038 (red line). The cells were fixed with 80% methanol (5 min) and then permeabilized with 0.1% PBS-Triton X-100 for 15 min. The cells were then incubated in 1x PBS containing 10% normal goat serum to block non-specific protein-protein interaction followed by the antibody (ab260038) (1x10⁶ in 100μl at 0.2 μg/ml) for 30 min at 22°C.

The secondary antibody Goat anti-rabbit IgG H&L (Alexa Fluor^® 488, pre-adsorbed) (ab150081) was used at 1/2000 for 30 min at 22°C.

Isotype control antibody was Rabbit IgG (monoclonal) (ab172730) used at the same concentration and conditions as the primary antibody (wild-type HeLa - black line ABCC1 knockout HeLa - grey line). Unlabelled sample was also used as a control (this line is not shown for the purpose of simplicity).

Acquisition of >5000 events were collected using a 50 mW Blue laser (488nm) and 525/40 bandpass filter.

Allele-1: 14 bp deletion in exon 9.

 

Allele-2: 2 bp deletion in exon 9.

 

Representative images of ABCC1 knockout HeLa cells, low and high confluency examples (top left and right respectively) and wild-type HeLa cells, low and high confluency (bottom left and right respectively) showing typical adherent, epithelial-like morphology. Images were captured at 10X magnification using a EVOS XL Core microscope.