Name : Human IL-18BP Protein

Product Source :
Recombinant Human IL-18BP Protein is expressed from HEK293 with hFc tag at the C-Terminus. It contains Thr31-Gly194.[Accession | O95998-2]

Molecular Weight :
The protein has a predicted MW of 44.4 kDa. Due to glycosylation, the protein migrates to 60-80 kDa based on Tris-Bis PAGE result.

Endotoxin Level :
Less than 1EU per μg by the LAL method.

Purity :
> 95% as determined by Tris-Bis PAGE

Formulation :
Lyophilized from 0.22μm filtered solution in PBS (pH 7.4). Normally 8% trehalose is added as protectant before lyophilization.

Reconstitution :
Centrifuge the tube before opening. Reconstituting to a concentration more than 100 μg/ml is recommended. Dissolve the lyophilized protein in distilled water.

Storage and Stability :
-20 to -80°C for 12 months as supplied from date of receipt. -80°C for 3-6 months after reconstitution. 2-8°C for 2-7 days after reconstitution. Recommend to aliquot the protein into smaller quantities for optimal storage. Please minimize freeze-thaw cycles.

Product Concentration :
Tris-Bis PAGE Human IL-18BP on Tris-Bis PAGE under reduced condition. The purity is greater than 95%. ELISA Data Immobilized Human IL-18 at 5μg/ml (100μl/Well) on the plate. Dose response curve for Human IL-18BP, hFc Tag with the EC50 of 16.9ng/ml determined by ELISA (QC Test). SPR Data Human IL-18BP, hFc Tag captured on Protein A chip, can bind Human IL-18 with an affinity constant of 0.04nM as determined in a SPR assay (Biacore T200).

Background :
Cytokines were the first modern immunotherapies to produce durable responses in patients with advanced cancer,components of the interleukin-18 (IL-18) pathway are upregulated on tumour-infiltrating lymphocytes, suggesting that IL-18 therapy could enhance anti-tumour immunity. IL-18BP, a high-affinity IL-18 decoy receptor, is frequently upregulated in diverse human and mouse tumours and limits the anti-tumour activity of IL-18 in mice.

Synonyms :
IL-18BP; Igifbp

References & Citations :
(1) Zhou T, Damsky W, Weizman OE, McGeary MK, Hartmann KP, Rosen CE, Fischer S, Jackson R, Flavell RA, Wang J, Sanmamed MF, Bosenberg MW, Ring AM. IL-18BP is a secreted immune checkpoint and barrier to IL-18 immunotherapy. Nature. 2020 Jul;583(7817):609-614. doi: 10.1038/s41586-020-2422-6. Epub 2020 Jun 24. PMID: 32581358; PMCID: PMC7381364.

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