Human CD25/IL-2R alpha Antibody Summary
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Cell Proliferation Induced by IL‑2 and Neutralization by Human CD25/IL‑2 R alpha Antibody. Recombinant Human IL-2 (Catalog # 202-IL) stimulates proliferation in the N1186 human T cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human IL-2 (1 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human CD25/IL-2 Ra Polyclonal Antibody (Catalog # AB-223-NA). The ND50 is typically 5-20 µg/mL.
Preparation and Storage
- 12 months from date of receipt, -20 to -70 °C as supplied.
- 1 month, 2 to 8 °C under sterile conditions after reconstitution.
- 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: CD25/IL-2R alpha
Human CD25, also known as IL-2 receptor alpha (IL-2 R alpha ) and asTac antigen, was initially identified as a 55 kDa membrane glycoprotein that is capable of binding IL‑2. The IL-2 R alpha cDNA encodes a 272 amino acid residue precursor Type I membrane protein with a 21 residue signal peptide, a 219 residue extracellular region, a 19 residue transmembrane region and a 13 residue cytoplasmic domain. IL-2 R alpha lacks structural features characteristic of members of the cytokine receptor superfamily. By itself, IL-2 R alpha binds IL-2 with low affinity. However, when IL-2 R alpha is associated with the IL-2 receptor beta and gamma chains, a high affinity heterotrimeric receptor complex that transduces IL-2 signals is formed. Soluble forms of many cytokine receptors have been reported, and a soluble form of IL-2 R alpha (IL-2 sR alpha ) appears in serum, concomitant with its increased expression on cells. The function of the soluble IL-2 R alpha is unclear. Increased levels of IL-2 sR alpha in biological fluids reportedly correlate with increased T and B cell activation and immune system activation. Increased serum concentration of IL-2 sR alpha has been observed in patients with a variety of inflammatory conditions and in the course of some leukemias and lymphomas.
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