Recombinant Human IL-1 RAcP/IL-1 R3 Protein, CF Summary
Ser21-Glu359, with a C-terminal 6-His tag
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS.|
|Reconstitution||Reconstitute at 200 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
Recombinant Human IL-1 RAcP/IL-1 R3 (Catalog # 9176-CP) inhibits IL-1 alpha -induced IL-8 secretion in HepG2 human hepatocellular carcinoma cells. The ED50 for this effect is 0.8-4 μg/mL.
Background: IL-1 RAcP/IL-1 R3
IL-1 Receptor Accessory Protein (IL-1 RAcP), also known as IL-1 R3, is a ubiquitously expressed 70-90 kDa member of the Interleukin-1 receptor family of proteins (1). It serves as a non-ligand-binding component of the receptors for IL-1 alpha, IL-1 beta, IL-33, and IL-36 (2-4). It is a subunit of the functional signaling complex with IL-1 RI and associates with IL-1 RII in a non-signaling receptor complex (2, 5). In addition, it interacts with ST2/IL-1 R4 on mast cells and Th2 cells to create a functional IL-33 receptor complex (3). IL-1 RAcP also functions as a co-receptor for IL-36 alpha /IL-1F6, IL-36 beta /IL-1F8, and IL-36 gamma /IL-1F9 (4). Mature human IL-1 RAcP consists of a 347 amino acid (aa) extracellular domain (ECD) with three Ig-like domains, a 21 aa transmembrane segment, and a 182 aa cytoplasmic domain (2). Within the ECD, human IL-1 RAcP shares 86% aa sequence identity with mouse and rat IL-1 RAcP. Alternative splicing generates two secreted decoy receptor isoforms and an isoform with a substituted cytoplasmic domain (6-8). When present with soluble IL-1 RII, soluble IL-1 RAcP increases the IL-1 binding affinity of IL-1 RII more than 100-fold, thus neutralizing the effects of IL-1 (9). Neuronal IL-1 RAcP interacts trans-synaptically with PTP sigma and can induce excitatory pre- and post-synaptic development (10).
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- Chackerian, A.A. et al. (2007) J. Immunol. 179:2551.
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- Lang, D. et al. (1998) J. Immunol. 161:6871.
- Lu, H.-L. et al. (2008) Mol. Immunol. 45:1374.
- Jensen, L.E. et al. (2000) J. Immunol. 164:5277.
- Jensen, L.E. and A.S. Whitehead (2003) Cell. Signal. 15:793.
- Smith, D.E. et al. (2003) Immunity 18:87.
- Yoshida, T. et al. (2012) J. Neurosci. 32:2588.
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