|Detection of Recombinant Human IL‑6 R alpha by Western Blot. Western blot shows 25 ng of Recombinant Human IL‑6 R alpha (Catalog # 227-SR) and Recombinant Mouse IL‑6 R alpha (Catalog # 1830-SR). PVDF Membrane was probed with 1 µg/mL of Mouse Anti-Human IL‑6 R alpha Monoclonal Antibody (Catalog # MAB227) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF007). A specific band was detected for IL‑6 R alpha at approximately 50 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 3.|
Detection of IL‑6 R alpha in U937 Human Cell Line by Flow Cytometry. U937 human histiocytic lymphoma cell line was labeled with Human IL‑6 R alpha Monoclonal Antibody (Catalog # MAB227, filled histogram) or isotype control antibody (Catalog # MAB002, open histogram), followed by Phycoerythrin-conjugated Anti-Mouse IgG|
F(ab')2 Secondary Antibody (Catalog # F0102B).
IL‑6 R alpha Enhancement of|
IL‑6-dependent Inhibition of Cell Proliferation and Neutralization by Human
IL‑6 R alpha Antibody. Recombinant Human IL‑6 R alpha (Catalog #
227-SR) enhances Recombinant Human IL‑6 (Catalog # 206-IL) inhibition of proliferation in the M1 mouse myeloid leukemia cell line in a dose-dependent manner (orange line). Enhancement of Recombinant Human IL‑6 (30 ng/mL) activity elicited by Recombinant Human IL‑6 R alpha (30 ng/mL) is neutralized (green line) by increasing concentrations of Mouse Anti-Human IL‑6 R alpha Monoclonal Antibody (Catalog # MAB227). The ND50 is typically
The multi-functional factor interleukin 6 (IL-6) exerts its activities through binding to a high-affinity receptor complex consisting of two membrane glycoproteins: an 80 kDa component receptor that binds IL-6 with low affinity (IL-6 R alpha ) and a signal-transducing component of 130 kDa (gp130) that does not bind IL-6 by itself, but is required for high-affinity binding of IL-6 by the complex. Both components of the receptor complex, IL-6 R alpha and gp130 have been cloned, sequenced, and expressed (1-4).
A soluble form of the IL-6 R alpha has been found in the urine of healthy adult humans (5). This soluble receptor apparently arises from proteolytic cleavage of membrane-bound IL-6 R alpha and is about 50kDa in size. No naturally-occurring mRNA encoding a truncated form of the IL-6 R alpha has been reported. Soluble forms of human and murine IL-6 R alpha s have been constructed, however, by insertion of termination codons into the regions of the IL-6 R alpha cDNAs encoding the external portions of the receptors and prior to the transmembrane domains. These soluble receptors have been expressed in COS-7 and CHO cells and have been shown to bind to IL-6 in solution and to augment the activity of IL-6 as a result of the binding of the IL-6/IL-6 R alpha complex to membrane-bound gp130 (6, 7).
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