Cell Proliferation Induced by IL‑11 and Neutralization by Mouse IL‑11 R alpha Antibody. |
Recombinant Mouse IL‑11 (Catalog # 418-ML) stimulates proliferation in the T11 mouse plasmacytoma cell line in a dose-dependent manner (orange line). Proliferation elicited by Recombinant Mouse IL‑11 (0.3 ng/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Mouse IL‑11 R alpha Antigen Affinity-purified Polyclonal Antibody (Catalog # AF490). The ND50 is typically 2‑6 µg/mL.
Mouse interleukin 11 receptor alpha (IL-11 R alpha ), originally designated NR1, is a member of the hematopoietic cytokine receptor family that was cloned on the basis of its conserved WSXWS motif. IL-11 R alpha cDNA encodes a 432 amino acid (aa) residue precursor type I membrane protein with a 23 aa residue signal peptide, a 344 aa residue extracellular domain containing two potential glycosylation sites, a 26 aa residue transmembrane region and a short (39 aa residue) cytoplasmic domain. In comparison with other hematopoietic cytokine receptors, the extracellular domain of IL-11 R alpha is closely related to that of IL-6 R alpha, CNTF R alpha and the p40 subunit of IL‑12, exhibiting 24%, 22% and 16% amino acid sequence identity, respectively. By itself, IL-11 R alpha binds IL-11 with low affinity. IL-11 R alpha, together with gp130, forms a functional high-affinity receptor complex for IL-11. The expression of IL-11 R alpha has been detected in all adult tissues examined (lung, stomach, intestine), during embryonic development and in totipotent and differentiating embryonic stem cells. Recombinant soluble IL-11 R alpha has been shown to mediate IL-11 responsiveness in cells expressing the gp130 molecule. In cells expressing transmembrane IL-11 R alpha and gp130, soluble IL-11 R alpha has been shown to act as an IL-11 antagonist.
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