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IL-2(Cys145Ser) is produced by recombinant DNA technology using a genetically engineered E. coli strain containing an analog of the human interleukin-2 gene. It has been engineered to contain the serine for cysteine substitution at amino acid position 145. IL-2(Cys145Ser) has similar characteristics and functions to IL-2, which is a leukocytotrophic hormone that is instrumental in the body natural response to microbial infection and in discriminating between foreign (non-self) and self. IL-2 is expressed by CD4+ and CD8+ T cells, gamma δ T cells, B cells, dendritic cells, and eosinophils. Mature human IL-2 shares 56% and 66% amino acid (aa) sequence identity with mouse and rat IL-2, respectively. Human and mouse IL-2 exhibit cross-species activity. IL-2 can stimulate B-cells, monocytes, lymphokine-activated killer cells, natural killer cells, and glioma cells, and plays a vital role in the expansion and maintenance of regulatory T cells, although it inhibits the development of Th17 polarized cells. Thus, IL-2 may be a key cytokine in the natural suppression of autoimmunity. Recombinant IL-2 is widely used in cell culture for the expansion of T cells.
Measured in a cell proliferation assay using CTLL2 cells, the EC50 for this effect is less than 0.2 ng/ml.
1μg (R: reducing condition, N: non-reducing condition).
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