AlphaLISA SureFire Ultra Human Phospho-IGF1 Receptor β (Tyr1135/1136) Detection Kit, 500 Assay Points

Phospho-AlphaLISA SureFire Ultra two-plate assay protocol

The two-plate protocol involves culturing and treating the cells in a 96-well plate before lysis, then transferring lysates into a 384-well OptiPlate™ plate before the addition of Phospho-AlphaLISA SureFire Ultra detection reagents. This protocol permits the cells viability and confluence to be monitored. In addition, lysates from a single well can be used to measure multiple targets.

Phospho-AlphaLISA SureFire Ultra one-plate assay protocol

Detection of Phosphorylated target protein with AlphaLISA SureFire Ultra reagents can be performed in a single plate used for culturing, treatment, and lysis. No washing steps are required. This HTS designed protocol allows for miniaturization while maintaining AlphaLISA SureFire Ultra quality.

Insulin induces rapid phosphorylation of IGF-1 Receptor

A431 cells were seeded in a 96-well plate (40,000 cells/well) in complete medium and incubated overnight at 37°C, 5% CO₂. The cells were treated with 200 µg/mL of insulin for various time points in serum free medium.

After treatment, the cells were lysed with 50 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Phospho (Tyr1135/1136) and Total IGF-1 Receptor β levels were evaluated using respective AlphaLISA SureFire Ultra assays. For the detection step, 10 µL of cell lysate (approximately 8,000 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, insulin induced a rapid and potent phosphorylation of Tyr1135/1136 while a modest, not significant increase was observed in Total levels.

Insulin induces IGF-1 R phosphorylation in a dose-dependent manner

A431 cells were seeded in a 96-well plate (40,000 cells/well) in complete medium and incubated overnight at 37°C, 5% CO₂. The cells were treated with increasing concentrations of insulin for 5 minutes.

After treatment, the cells were lysed with 50 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Phospho (Tyr1135/1136) and Total IGF-1 Receptor β levels were evaluated using respective AlphaLISA SureFire Ultra assays. For the detection step, 10 µL of cell lysate (approximately 8,000 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, insulin induced a dose-dependent increase in Phospho (Tyr1135/1136) levels with no significant changes in Total levels.

IGF-1 induces IGF-1 Receptor phosphorylation in MCF7 cells

MCF7 cells were seeded in a 96-well plate (40,000 cells/well) in complete medium and incubated overnight at 37°C, 5% CO₂. The cells were serum starved for 2 hours followed by a treatment with increasing concentrations of IGF-1 for 15 minutes.

After treatment, the cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Phospho (Tyr1135/1136) and Total IGF-1 Receptor β levels were evaluated using respective AlphaLISA SureFire Ultra assays. For the detection step, 10 µL of cell lysate (approximately 8,000 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, IGF-1 induced a dose-dependent increase in Phospho (Tyr1135/1136) levels while Total levels remained unchanged.

IGF-1 Receptor β assay sensitivity - cell lysate dilution

Cell lysate was prepared from A431 cells cultured to confluence in T175 flasks in complete medium. Cells were treated with 200 µg/mL insulin for 5 minutes and then lysed in 4 mL of Lysis Buffer.

Lysates were serially diluted in Lysis Buffer and assayed for Phospho (Tyr1135/1136) and Total IGF-1 Receptor using respective AlphaLISA SureFire Ultra kits. For the detection step, 10 µL of lysate was transferred into a 384-well white OptiPlate, followed by 5 µL of Acceptor mix and incubated for 1 hour at room temperature. 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.

Approximate number of cells/datapoint is indicated. The dotted line represents assay background. The assay can detect IGF-1 Receptor expression down to 500 cells/datapoint.