Platelet-Derived Growth Factor Receptor Alpha (PDGFRα) is a receptor tyrosine kinase involved in embryonic development, tissue repair, and angiogenesis. It binds PDGF-AA, -BB, and -CC ligands, activating downstream signaling pathways such as PI3K/AKT, MAPK, and STATs to promote proliferation, survival, and migration. PDGFRα mutations, amplifications, or fusions are oncogenic drivers in gastrointestinal stromal tumors (GISTs), gliomas, and dermatofibrosarcoma protuberans. Aberrant PDGFRα signaling is also implicated in fibrotic diseases and vascular disorders. Targeted therapies against PDGFRα have shown efficacy in PDGFR-driven tumors, and ongoing efforts aim to expand therapeutic targeting across disease contexts.
The AlphaLISA SureFire Ultra Human and Mouse Total PDGFRα Detection Kit is a sandwich immunoassay for the quantitative detection of total PDGFRα in cellular lysates, using Alpha Technology.
Formats:
The HV (high volume) kit contains reagents to run 100 wells in 96-well format, using a 60 μL reaction volume.
The 500-point kit contains enough reagents to run 500 wells in 384-well format, using a 20 μL reaction volume.
The 10,000-point kit contains enough reagents to run 10,000 wells in 384-well format, using a 20 μL reaction volume.
The 50,000-point kit contains enough reagents to run 50,000 wells in 384-well format, using a 20 μL reaction volume.
AlphaLISA SureFire Ultra kits are compatible with:
Cell and tissue lysates
Antibody modulators
Biotherapeutic antibodies
AlphaLISA SureFire Ultra kits can be used for:
Cellular kinase assays
Receptor activation studies
High-throughput screening for preclinical studies
Total-AlphaLISA SureFire Ultra assay principle
The Total-AlphaLISA SureFire Ultra assay measures the expression level of a target protein in a biological sample (e.g. cell lysate).
The Total-AlphaLISA SureFire Ultra assay uses two antibodies which recognize two different distal epitopes on the target protein. AlphaLISA assays require two bead types: Acceptor and Donor Beads. Acceptor Beads are coated with a proprietary CaptSure™ agent to specifically immobilize the assay specific antibody, labeled with a CaptSure tag. Donor Beads are coated with streptavidin to capture one of the detection antibodies, which is biotinylated. In the presence of target protein, the two antibodies bring the Donor and Acceptor Beads in close proximity whereby the singlet oxygen transfers energy to excite the Acceptor Bead, allowing for the generation of a luminescent Alpha signal. The amount of light emission is directly proportional to the quantity of protein present in the sample.
Total-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 Total-AlphaLISA SureFire Ultra detection reagents. This protocol enables cell viability and confluence to be monitored. In addition, lysates from a single well can be used to measure multiple targets.
Total-AlphaLISA SureFire Ultra one-plate assay protocol
Detection of Total 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 robust AlphaLISA SureFire Ultra quality.
PDGF Receptor α activation in cells treated with PDGF-BB
NIH/3T3 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 PDGF-BB for 10 minutes.
After treatment, the cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). PDGF Receptor α Phospho (Tyr720) 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, the PDGF-BB triggered a dose-dependent increase in the levels of Phospho (Tyr720) PDGF Receptor α while Total levels remained unchanged.
PDGF Receptor α inhibition in cells treated with Dasatinib
Caco-2 cells were seeded in a 96-well plate (50,000 cells/well) in medium containing 20% FBS and incubated overnight at 37°C, 5% CO2. The cells were treated with increasing concentrations of Dasatinib for 30 minutes.
After treatment, the cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). PDGF Receptor α Phospho (Tyr720) 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, the Dasatinib triggered a dose-dependent decrease in the levels of Phospho (Tyr720) PDGF Receptor α while Total levels remained unchanged.
Knockout validation of PDGF Receptor α Total assay
PDGF Receptor α Total levels were assessed in Wild Type (WT) and PDGFR α knockout (KO) SH-SY5Y (Abcam, ab275335) cells. PDGFR α KO cells and SH-SY5Y WT cells were seeded at various densities in a 96 well plate in complete medium, and incubated overnight at 37°C, 5% CO2.
The cells were lysed with 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). PDGFR α levels were evaluated by AlphaLISA SureFire Ultra. For the detection step, 10 µL of cell lysate 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, PDGF Receptor α was only detected in WT cells demonstrating assay selectivity.
Expression of PDGF Receptor α in various cell lines
Adherent cells were seeded at 40,000 cells/well in a 96-well culture plate in complete medium and incubated overnight at 37°C, 5% CO2. Cells were lysed with 100 µL of Lysis Buffer.
Suspension cells were seeded at 400,000 cells/well in a 96-well culture plate in HBSS + 0.1% BSA, cells were spun down and lysed with 100 µL of Lysis Buffer.
PDGF Receptor α Total levels were evaluated by AlphaLISA SureFire Ultra. For the detection step, 10 µL of cell lysate (approximately 4,000 adherent cells or 40,000 suspension 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.
PDGF Receptor α expression is dependent upon cell type. High levels of expression were detected in Caco-2 and NIH/3T3 cells.
