Human IL-2 ELISpot Pair

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ELISA Kit Technical ManualMSDS

Human IL-2 ELISpot Pair

Assay Genie ELISpot is a highly specific immunoassay for the analysis of IL-2 production and secretion from T-cells at a single cell level in conditions closely comparable to the in-vivo environment with minimal cell manipulation. This technique is designed to determine the frequency of IL-2 producing cells under a given stimulation and the comparison of such frequency against a specific treatment or pathological state. Utilising sandwich immuno-enzyme technology, Assay Genie ELISpot assays can detect both secreted IL-2 (qualitative analysis) and single cells that produce IL-2 (quantitative analysis). Cell secreted IL-2 is captured by coated antibodies avoiding diffusion in supernatant, protease degradation or binding on soluble membrane receptors. After cell removal, the captured IL-2 is revealed by tracer antibodies and appropriate conjugates.

Human IL-2 ELISpot Pair - Kit Principle

A capture antibody highly specific for IL-2 is coated to the wells of a PVDF bottomed 96 well microtitre plate either during kit manufacture or in the laboratory. The plate is then blocked to minimise any non-antibody dependent unspecific binding and washed. Cell suspension and stimulant are added and the plate incubated allowing the specific antibodies to bind any IL-2 produced. Cells are then removed by washing prior to the addition of Biotinylated detection antibodies which bind to the previously captured IL-2. Enzyme conjugated streptavidin is then added binding to the detection antibodies. Following incubation and washing, substrate is then applied to the wells resulting in coloured spots which can be quantified using appropriate analysis software or manually using a microscope.

ELISpot Protocol
Figure: Schematic representation of the principle of ELISpot. 1) Treat with ethanol, coat with capture antibody. 2) Incubate cells in the presence of stimuli, cytokines, are released, which bind to capture antibodies. 3) Wash plate. Incubate with biotinylated detection antibody. 4) Wash plate. Incubate with streptavidin-alkaline phosphatase conjugated. 5)Incubate with BCIP/NBT. Precipitated product forms, results in blue/purple spots.


1.Add 100 µl of PBS 1X to every well.
2.Incubate plate at room temperature (RT) for 10 min.
2.Incubate plate at room temperature (RT) for 10 min.
3.Empty the wells by flicking the plate over a sink & gently tapping on absorbent paper.
3.Empty the wells by flicking the plate over a sink & gently tapping on absorbent paper.
4.Add 100 µl of sample, positive and negative controls cell suspension to appropriate wells providing the required concentration of cells and stimulant.
5.Cover the plate and incubate at 37°C in a CO2 incubator for an appropriate length of time (15-20 hours). Note: do not agitate or move the plate during this incubation.
6.Empty the wells and remove excess solution then add 100 µl of Wash Buffer to every well.
7.Incubate the plate at 4°C for 10 min.
8.Empty the wells as previous and wash the plate 3x with 100 µl of Wash Buffer.
9.Add 100 µl of diluted detection antibody to every well.
10.Cover the plate and incubate at RT for 1 hour 30 min.
11.Empty the wells as previous and wash the plate 3x with 100 µl of Wash Buffer.
12.Add 100 µl of diluted Streptavidin-AP conjugate to every well.
13.Cover the plate and incubate at RT for 1 hour.
14.Empty the wells and wash the plate 3x with 100 µl of Wash Buffer.
15.Peel of the plate bottom and wash both sides of the membrane 3x under running distilled water, once washing is complete remove any excess solution by repeated tapping on absorbent paper.
16.Add 100 µl of ready-to-use BCIP/NBT buffer to every well.
17.Incubate the plate for 5-15 min monitoring spot formation visually throughout the incubation period to assess sufficient colour development.
18.Empty the wells and rinse both sides of the membrane 3x under running distilled water. Completely remove any excess solution by gentle repeated tapping on absorbent paper.
19.Read Spots: allow the wells to dry and then read results. The frequency of the resulting coloured spots corresponding to the cytokine producing cells can be determined using an appropriate ELISpot reader and analysis software or manually using a microscope. Note: spots may become sharper after overnight incubation at 4°C in the dark.

Human IL-2 ELISpot Pair - Information

Product type: ELISpot Pairs
Target species: Human
Specificity: Recognizes natural human IL-2
Kit content: Assay Genie ELISpot matched antibody pairs are extensively validated and include pre-titrated capture antibody and biotinylated detection antibody. Antibodies are supplied in quantities sufficient for 10 x 96 samples.
Synonyms: N/A
Uniprot: P60568

IL-2 - Protein Information

UniProt Protein Function:IL2: Produced by T-cells in response to antigenic or mitogenic stimulation, this protein is required for T-cell proliferation and other activities crucial to regulation of the immune response. Can stimulate B-cells, monocytes, lymphokine- activated killer cells, natural killer cells, and glioma cells. A chromosomal aberration involving IL2 is found in a form of T-cell acute lymphoblastic leukemia (T-ALL). Translocation t(4;16)(q26;p13) with involves TNFRSF17. Belongs to the IL-2 family.
UniProt Protein Details:

Protein type:Cytokine; Secreted; Secreted, signal peptide; Oncoprotein

Chromosomal Location of Human Ortholog: 4q26-q27

Cellular Component: extracellular space; extracellular region

Molecular Function:growth factor activity; interleukin-2 receptor binding; kinase activator activity; cytokine activity; carbohydrate binding; glycosphingolipid binding; kappa-type opioid receptor binding

Biological Process: positive regulation of isotype switching to IgG isotypes; negative regulation of heart contraction; natural killer cell activation; positive regulation of activated T cell proliferation; negative regulation of lymphocyte proliferation; elevation of cytosolic calcium ion concentration; negative regulation of protein amino acid phosphorylation; cell-cell signaling; protein kinase C activation; positive regulation of cell proliferation; positive regulation of B cell proliferation; cell adhesion; T cell differentiation; positive regulation of interleukin-17 production; regulation of T cell homeostatic proliferation; positive regulation of regulatory T cell differentiation; positive regulation of immunoglobulin secretion; positive regulation of cell growth; positive regulation of tissue remodeling; positive regulation of interferon-gamma production; positive regulation of tyrosine phosphorylation of Stat5 protein; negative regulation of inflammatory response; positive regulation of transcription from RNA polymerase II promoter; immune response; negative regulation of B cell apoptosis; positive regulation of inflammatory response; negative regulation of apoptosis

NCBI Summary:The protein encoded by this gene is a secreted cytokine that is important for the proliferation of T and B lymphocytes. The receptor of this cytokine is a heterotrimeric protein complex whose gamma chain is also shared by interleukin 4 (IL4) and interleukin 7 (IL7). The expression of this gene in mature thymocytes is monoallelic, which represents an unusual regulatory mode for controlling the precise expression of a single gene. The targeted disruption of a similar gene in mice leads to ulcerative colitis-like disease, which suggests an essential role of this gene in the immune response to antigenic stimuli. [provided by RefSeq, Jul 2008]
UniProt Code:P60568
NCBI GenInfo Identifier:45593462
NCBI Gene ID:3558
NCBI Accession:P60568.1
UniProt Secondary Accession:P60568,P01585,
UniProt Related Accession:P60568
Molecular Weight:153
NCBI Full Name:Interleukin-2
NCBI Synonym Full Names:interleukin 2
NCBI Official Symbol:IL2  
NCBI Official Synonym Symbols:IL-2; TCGF; lymphokine  
NCBI Protein Information:interleukin-2; aldesleukin; T cell growth factor; involved in regulation of T-cell clonal expansion
UniProt Protein Name:Interleukin-2
UniProt Synonym Protein Names:T-cell growth factor; TCGF; INN: Aldesleukin
Protein Family:Interleukin
UniProt Gene Name:IL2  
UniProt Entry Name:IL2_HUMAN
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