Detects human IL-5 R alpha in direct ELISAs and Western blots. In direct ELISAs and Western blots, less than 5% cross-reactivity with recombinant human (rh) IL‑1 RII, rhIL-2 R beta, rhIL-2 R gamma, rhIL-3 R is observed and less than 1% cross-reactivity with rhIL‑1 RI, rhIL‑4 R, rhIL‑6 R, rhIL‑7 R, rhIL‑9 R, and rhIL‑10 R is observed.
Polyclonal Goat IgG
S. frugiperda insect ovarian cell line Sf 21-derived recombinant human IL‑5 R alpha /CD125
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
<0.10 EU per 1 μg of the antibody by the LAL method.
Recombinant Human IL‑5 R alpha /CD125 (Catalog # 253-5R)
2.5 µg/106 cells
Human blood‑derived granulocytes
Measured by its ability to neutralize IL‑5-induced proliferation in the TF‑1 human erythroleukemic cell line. Kitamura, T. et al. (1989) J. Cell Physiol. 140:323. The Neutralization Dose (ND50) is typically 1-3 µg/mL in the presence of 0.5 ng/mL Recombinant Human IL‑5.
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‑5 and Neutralization by Human IL‑5 R alpha /CD125 Antibody.
Recombinant Human IL‑5 (Catalog # 205-IL) stimulates proliferation in the TF‑1 human erythroleukemic cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human IL‑5 (0.5 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human IL‑5 R alpha /CD125 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF-253-NA). The ND50 is typically 1-3 µg/mL.
Preparation and Storage
Reconstitute at 0.2 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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: IL-5 R alpha/CD125
Interleukin 5, produced primarily by activated T cells and mast cells, has diverse biological effects on a variety of cell types. Human IL-5 is a potent eosinophil differentiation and activation factor in vivo and in vitro. Additionally, it has also been reported that IL-5 can stimulate the proliferation and/or differentiation of basophils and B cells. The multiple effects of IL-5 are mediated by binding of the cytokine to specific cell surface receptors expressed on target cells. As is the case with many other cytokines, the functional high-affinity receptor for IL-5 is a complex consisting of a ligand binding subunit ( alpha chain) and a second subunit ( beta chain) that can modulate the ligand binding affinity of the receptor complex. In the case of IL-5, the beta subunit is shared with the high affinity receptor complexes for IL-3 and GM-CSF. The beta chain does not bind any of the cytokines in question but is indispensable for the cytokine-mediated signaling.
cDNA clones for the alpha chain (IL-5 R alpha ) of both the mouse and human high affinity IL-5 receptor complexes have been isolated. Human and mouse IL-5 R alpha are both members of the hematopoietin receptor superfamily characterized by the presence of the WSXWS, and a four cysteine residue motif in the extracellular domain of the transmembrane protein. In addition to the cDNA clone encoding the full-length transmembrane protein, cDNA clones that arise from alternative splicing and that encode soluble secreted forms of IL-5 R alpha have been isolated from mouse as well as human cells. A naturally-occurring soluble form of the IL-5 R alpha has been detected in biological fluids of autoimmune-prone mice and mice bearing chronic B cell leukemia (BCL1).
A recombinant human IL-5 soluble receptor alpha has been shown to bind the human IL-5 dimer in a 1:1 ratio and acts as a human IL-5 antagonist. This molecule inhibits the proliferation of IL-5-dependent cell lines and blocks human umbilical cord blood eosinophil differentiation.
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