Description
Overview
Interferon regulator factor 5, IRF5, is a transcriptional regulator of type I interferon (IFN-alpha and IFN-beta)-dependent immune responses. This transcription factor plays a key role in the innate immune response against DNA and RNA viruses. IRF5 is present in the cytoplasm of uninfected cells in an inactive form. Various mediators of the pathways that follow viral infection can overexpress and phosphorylate IRF5. IRF5 is associated with various cancers and autoimmune diseases.
The AlphaLISA
SureFire Ultra
Human and Mouse Total IRF5 Detection Kit is a sandwich immunoassay for the quantitative detection of total IRF5 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
Alpha
SureFire
kits can be used for
Cellular kinase assays
Receptor activation studies
Screening
How it works
Total-AlphaLISA
SureFire Ultra
assay principle
The Total-AlphaLISA
SureFire Ultra
assay measures the expression level of a protein target in a cell lysate.
The Total-AlphaLISA
SureFire Ultra
assay uses two antibodies which recognize two different distal epitopes on the targeted 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 targeted 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 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 permits the cells 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 AlphaLISA
SureFire Ultra
quality.
Assay versatility
Evaluation of IRF5 Total expression in Peripheral Blood Mononuclear Cells
Peripheral Blood Mononuclear Cells (PBMCs) were isolated from healthy donors using Ficoll® Plaque Plus (Merck GE17-1440-02).
Cells were seeded in 96-well plate (400,000 cells/well) and lysed in 100 µL of Lysis Buffer for 10 minutes at RT with shaking (350 rpm). Generated lysate was then serially diluted in Lysis Buffer and evaluated using the AlphaLISA
SureFire Ultra
Total IRF5. For the detection step, 10 µL of cell lysate (starting from approximately 40,000 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. The number of cells/datapoint is indicated on graph.
Differential expression of IRF5 Total in various cell lines
Human and mouse cell lysates were diluted with Lysis Buffer. Approximate number of cells/datapoint is indicated on graph. Total IRF5 levels were evaluated using the AlphaLISA SureFira Ultra assay kit. 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.
Total IRF5 expression varies depending upon cell type. As expected, a very high level of expression was detected in human cell lines: THP-1, KARPAS-299 and U937 and mouse cell lines: RAW 264.7 and L929.
