AlphaLISA SureFire Ultra Human and Mouse Phospho-Rb (Ser807/811) Detection Kit, 500 Assay Points

Activation of Phospho (Ser807/811) in NRG1 treated cells

MCF7 cells were seeded in a 96-well plate (20,000 cells/well) in complete medium, and incubated overnight at 37°C, 5% CO2. The cells were pre-treated with 20 µM Wortmannin in serum free medium for 2 hours, followed by treatment with increasing concentrations of Neuregulin 1 (NRG1) in serum free medium for 24 hours.

After treatment, the cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Rb Phospho (Ser807/811) and Total levels were evaluated using respective AlphaLISA SureFire Ultra assays. For the detection step, 10 µL of cell lysate (approximately 2,000 cells) were transferred into a 384-well white OptiPlate, followed by 5 µL of Acceptor mix and incubated for 1 hour at RT. Finally, 5 µL of Donor mix was then added to each well and incubated for 1 hour at RT in the dark. The plate was read on an Envision using standard AlphaLISA settings.

NRG1 induced a significant increase in the levels of Phospho (Ser807/811) and a modest increase in Rb Total. 

Decrease of Rb Phospho (Ser807/811) in Palbociclib treated endogenous cell lines

THP-1 cells were seeded in a 96-well plate (200,000 cells/well) in complete medium and treated with increasing concentrations of Palbociclib for 24 hours.

After treatment, the cells were washed with HBSS and lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Rb Phospho (Ser807/811) and Total levels were evaluated using respective AlphaLISA SureFire Ultra assays.

For the detection step, 10 µL of cell lysate (approximately 20,000 cells/datapoint) were transferred into a 384-well white OptiPlate, followed by 5 µL of Acceptor mix and incubated for 1 hour at RT. Finally, 5 µL of Donor mix was then added to each well and incubated for 1 hour at RT in the dark. The plate was read on an Envision using standard AlphaLISA settings.

As expected, Palbociclib triggered a dose-dependent decrease in the levels of Phospho (Ser807/811). 

MCF7 cells were seeded in a 96-well plate (50,000 cells/well) in complete medium, and incubated overnight at 37°C, 5% CO2. The cells were treated with increasing concentrations of Palbociclib for 24 hours.

After treatment, the cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Rb Phospho (Ser807/811)  and Total levels were evaluated using respective AlphaLISA SureFire Ultra assays. For the detection step, 10 µL of cell lysate (approximately 5,000 cells) was transferred into a 384-well white OptiPlate, followed by 5 µL of Acceptor mix and incubated for 1 hour at RT. Finally, 5 µL of Donor mix was then added to each well and incubated for 1 hour at RT in the dark. The plate was read on an Envision using standard AlphaLISA settings.

As expected, Palbociclib triggered a dose-dependent decrease in the levels of Rb Phospho (Ser807/811).