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EK000021-EK0397: Human IL-2 ELISA Kit
Range 15.6pg/ml-1000pg/ml
Sensitivity < 1 pg/ml
Specificity: no detectable cross-reactivity with any other cytokine.
Application: for quantitive detection of human IL-2 in sera, plasma, body fluids, tissue lysates or cell culture supernates.
Expiration: four months at 4°C and eight months at -20°C.
Background
Interleukin-2 (IL2), formerly referred to as T-cell growth factor, is a powerfully immunoregulatory lymphokine that is produced by lectin- or antigen-activated T cells. It is produced not only by mature T lymphocytes on stimulation but also constitutively by certain T-cell lymphoma cell lines. The lymphokine interleukin-2 (IL-2) is responsible for autocrine cell cycle progression and regulation of immune responses. IL-2 expression in mature thymocytes and T cells has been found to be tightly controlled by monoallelic expression.1 IL-2 can act as a growth hormone for both B and T lymphocytes.2 The human gene for interleukin 2 (IL2) is assigned to chromosome 4.3 Human IL-2 is a 15.5KDa glycoprotein, consisting of 153 amino acids in precursor form and 133 amino acids in mature form.
Principle
The ELISA Kit is based on standard sandwich enzyme-linked immune-sorbent assay technology. The target specific antibodies are precoated onto 96-well plates. The target from the sample is bound to the microwell. The biotinylated target specific detection antibodies are added to the microwells and followed by washing with the PBS or TBS buffer. Avidin-Biotin-Peroxidase Complex is added and unbound conjugates are washed away with the PBS or TBS buffer. TMB, the HRP (horseradish peroxidase) substrate, is used to visualize color change resulting from the HRP enzymatic reaction. TMB is catalyzed by HRP to produce the blue color. The color changes into yellow after the acidic stop solution is added. The density of the yellow color is proportional to the target amount from the sample captured in the microwells.
Reference
1. Hollander, G. A.; Zuklys, S.; Morel, C.; Mizoguchi, E.; Mobisson, K.; Simpson, S.; Terhorst, C.; Wishart, W.; Golan, D. E.; Bhan, A. K.; Burakoff, S. J. Monoallelic expression of the interleukin-2 locus. Science 279: 2118-2121, 1998.
2. Lowenthal, J. W.; Zubler, R. H.; Nabholz, M.; MacDonald, H. R. Similarities between interleukin-2 receptor number and affinity on activated B and T lymphocytes. Nature 315: 669-672, 1985.
3. Shows, T.; Eddy, R.; Haley, L.; Byers, M.; Henry, M.; Fujita, T.; Matsui, H.; Taniguchi, T. Interleukin 2 (IL2) is assigned to human chromosome 4. Somat. Cell Molec. Genet. 10: 315-318, 1984.
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