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Bcakground
Interleukin-2 (IL2),also known as a T-cell growth factor, TCGF, and Aldesleukin, is a secreted protein that belongs to the IL-2 family. IL2 has potent stimulatory activity for antigen-activated T cells, and is expressed by T cells, B cells, dendritic cells, and eosinophils (1-3). Mature human IL-2 shares 56% aa sequence identity with mouse IL-2. Human and mouse IL-2 exhibit cross-species activity (4). The receptor for IL-2 consists of three subunits that are present on the cell surface in varying preformed complexes (5-7). The 55 kDa IL-2 R alpha is specific for IL-2 and binds with low affinity. The 75 kDa IL-2R beta, which is also a component of the IL-15 receptor, binds IL-2 with intermediate affinity. The 64 kDa common gamma chain gamma c/IL-2 R gamma, which is shared with the receptors for IL-4, -7, -9, -15, and -21, does not independently interact with IL-2. Upon ligand binding, signal transduction is performed by both IL-2 R beta and gamma c. IL-2 is best known for its autocrine and paracrine activity on T cells. It drives resting T cells to proliferate and induces IL-2 and IL-2 R alpha synthesis (1, 2). It contributes to T cell homeostasis by promoting the Fas-induced death of naive CD4+ T cells but not activated CD4+ memory lymphocytes (8). IL-2 plays a central role in the expansion and maintenance of regulatory T cells, although it inhibits the development of Th17 polarized cells (9-11). Thus, IL-2 may be a key cytokine in the natural suppression of autoimmunity (12, 13).
Reference
1. Ma, A. et al. (2006) Annu. Rev. Immunol. 24:657.
2. Gaffen, S.L. and K.D. Liu (2004) Cytokine 28:109.
3. Taniguchi, T. et al. (1983) Nature 302:305.
4. Mosmann, T.R. et al. (1987) J. Immunol. 138:1813.
5. Liparoto, S.F. et al. (2002) Biochemistry 41:2543.
6. Wang, X. et al. (2005) Science 310:1159.
7. Bodnar, A. et al. (2008) Immunol. Lett. 116:117.
8. Jaleco, S. et al. (2003) J. Immunol. 171:61.
9. Malek, T.R. (2003) J. Leukoc. Biol. 74:961.
10. Laurence, A. et al. (2007) Immunity 26:371.
11. Kryczek, I. et al. (2007) J. Immunol. 178:6730.
12. Afzali, B. et al. (2007) Clin. Exp. Immunol. 148:32.
13. Fehervari, Z. et al. (2006) Trends Immunol. 27:109.
Specifications
| Synonyms | Human IL2; IL-2; IL-2; IL2; interleukin-2 |
| Accession # | P60568 |
| Source | Human embryonic kidney cell, HEK293-derived human IL2 protein |
| Ala21-Thr153 | |
| Predicted Moleucular weight | 15.4 kDa |
Components and Storage
| Formulation | Solution protein. |
| Dissolved in sterile PBS buffer to a concentration of 0.2 mg/mL. | |
| This solution can be diluted into other aqueous buffers. Centrifuge the vial prior to opening. | |
| Storage and Stability | Avoid repeated freeze-thaw cycles. |
| It is recommended that the protein be aliquoted for optimal storage. | |
| 12 months from date of receipt, -20 to -70 °C as supplied. | |
| Shipping | Shipping with dry ice. |
Quality
| Purity | > 95%, determined by SDS-PAGE. |
| Endotoxin Level | <0.010 EU per 1 ug of the protein by the LAL method. |
| Activity | Measured in a cell proliferation assay using CTLL-2 mouse cytotoxic T cells. |
| The EC50 for this effect is 0.05-0.25 ng/mL. |
SDS-PAGE
Gel filtration
Bioactivity
Documents
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