• Product name
    Human IL-2 ELISA Kit
    See all IL-2 kits
  • Detection method
  • Precision
    Sample n Mean SD CV%
    Overall 6 6%
    Sample n Mean SD CV%
    Overall 24 6%
  • Sample type
    Cell culture supernatant, Serum, Plasma
  • Assay type
    Sandwich (quantitative)
  • Sensitivity
    9 pg/ml
  • Range
    15.63 pg/ml - 2000 pg/ml
  • Recovery

    Sample specific recovery
    Sample type Average % Range
    Serum 95 93% - 97%
    Cell culture media 94 83% - 109%
    Heparin Plasma 91 82% - 95%
    EDTA Plasma 100 95% - 105%
    Citrate Plasma 83 77% - 98%

  • Assay time
    1h 30m
  • Assay duration
    One step assay
  • Species reactivity
    Reacts with: Human
    Does not react with: Mouse
  • Product overview

    AAbcam’s Human IL-2 (Interleukin 2) in vitro SimpleStep ELISA™ (Enzyme-Linked Immunosorbent Assay) kit is designed for the quantitative measurement of IL-2 protein in Human cell culture supernatant, plasma and serum samples.

    The SimpleStep ELISA™ employs an affinity tag labeled capture antibody and a reporter conjugated detector antibody which immunocapture the sample analyte in solution. This entire complex (capture antibody/analyte/detector antibody) is in turn immobilized via immunoaffinity of an anti-tag antibody coating the well. To perform the assay, samples or standards are added to the wells, followed by the antibody mix. After incubation, the wells are washed to remove unbound material. TMB substrate is added and during incubation is catalyzed by HRP, generating blue coloration. This reaction is then stopped by addition of Stop Solution completing any color change from blue to yellow. Signal is generated proportionally to the amount of bound analyte and the intensity is measured at 450 nm. Optionally, instead of the endpoint reading, development of TMB can be recorded kinetically at 600 nm

  • Notes

    IL-2, also known as T cell growth factor (TCGF), is a glycosylated alpha-helical polypeptide, synthesized as a 153 amino acid (aa) precursor with a 20 aa signal peptide and a 133 aa mature chain. It is secreted by activated CD4+ and CD8+ T cells, neurons, microglia and hematopoietic stem cells in response to antigenic or mitogenic stimulation. IL-2 is required for T-cell proliferation, Natural Killer cells (NK) cytolytic activity, differentiation of regulatory T cells, modulation of T helper (Th) cell differentiation and activation-induced cell death. In particular, IL-2 modulates the expression of receptors for other cytokines and transcription factors, therefore regulating cytokine cascades that correlate with each of the Th differentiation states.

    Complete deficiency of IL-2 has been implicated in severe combined immunodeficiency, whereas reduction of the IL-2 correlates with reduced function of CD4+CD25+ regulatory T cells and destabilization of immune homeostasis leading to autoimmune disease. Increased expression of IL-2 has also been implicated in inflammatory conditions such as inflammatory bowel disease and chronic liver diseases. IL-2 therefore is both a immune stimulator and immune suppressor cytokine which efficiently controls the immune system to deal with autoimmunity and adaptive immune response.

  • Tested applications
    Suitable for: Sandwich ELISAmore details
  • Platform



Our Abpromise guarantee covers the use of ab174444 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
Sandwich ELISA Use at an assay dependent concentration.


  • ELISA Protocol Summary
  • Example IL-2 standard curve in sample diluents NS.

  • Background-subtracted data values (mean +/- SD) are graphed.

  • Human PBMCs were cultured in RPMI supplemented with 10% fetal calf serum, 2mM L-glutamine, 100U/mL penicillin, and 100 µg/mL streptomycin. Cells were cultured for 2 days at 37⁰C in the presence or absence of PHA. The concentrations of IL-2 were interpolated from the calibration curve and corrected for sample dilution. The mean IL-2 concentration was determined to be 16 pg/mL in unstimulated PBMC supernatants and 11,460 pg/mL in stimulated PBMC supernatants.



This product has been referenced in:
  • Jia Y  et al. Overexpression of CD59 inhibits apoptosis of T-acute lymphoblastic leukemia via AKT/Notch1 signaling pathway. Cancer Cell Int 19:9 (2019). Read more (PubMed: 30636930) »
See 1 Publication for this product

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