|Cell Proliferation Induced by IL‑13 and Neutralization by Human IL‑13 R alpha 1 Antibody. Recombinant Human IL‑13 (Catalog # 213‑ILB) stimulates proliferation in the TF‑1 human erythroleukemic cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Human IL‑13 (10 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human IL‑13 R alpha 1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF152). The ND50 is typically 10‑30 µg/mL.|
|Detection of IL‑13 R alpha 1 in Human Granulocytes by Flow Cytometry. Human whole blood granulocytes were stained with Goat Anti-Human IL‑13 R alpha 1 Antigen Affinity‑purified Polyclonal Antibody (Catalog # AF152, filled histogram) or control antibody (Catalog # AB-108-C, open histogram), followed by Phycoerythrin-conjugated Anti-Goat IgG Secondary Antibody (Catalog # F0107).|
|IL‑13 R alpha 1 in Human Skin. IL‑13 R alpha 1 was detected in immersion fixed paraffin-embedded sections of human skin using Goat Anti-Human IL‑13 R alpha 1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF152) at 15 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Goat HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS008) and counterstained with hematoxylin (blue). View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.|
Two type 1 membrane proteins belonging to the hemopoietin receptor family have been cloned and shown to bind IL-13 with differing affinities. The lower affinity IL-13 binding protein, previously designated IL-13 R alpha, IL-13 R alpha ' or NR4, is now referred to as IL-13 R alpha 1. The high-affinity IL-13 binding protein, previously also designated IL-13 R or IL-13 R alpha ', is now referred to as IL-13 R alpha 2. The human IL-13 R alpha 1 was originally cloned based on sequence homology to the mouse IL-13 R alpha 1. The IL‑13 R alpha 1 cDNA encodes a 427 amino acid (aa) residue precursor protein with a putative 21 aa residue signal peptide, a 324 aa residue extracellular domain, a 23 aa residue transmembrane region and a 59 aa residue cytoplasmic tail. Human and mouse IL-13 R alpha 1 share 76% aa sequence identity. The extracellular domain of IL‑13 R alpha 1 is also closely related to that of IL-13 R alpha 2. IL-13 R alpha 1 has been shown to combine with the IL-4 R alpha to form a high-affinity receptor complex capable of transducing an IL-13-dependent proliferative signal. The role of IL-13 R alpha 2 in IL-13 signaling remains to be elucidated.
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