Recombinant Mouse IL-18BP-Fc Chimera (carrier-free)

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Regulatory Status
Other Names
Interleukin-18-Binding Protein , Tadekinig-Alfa, IL-18-BP, MC54L
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Product Citations
Recombinant mouse IL-18BP-Fc Chimera binds to immobilized recombinant mouse IL-18 (Cat. No. 767002). The ED50 for this effect is 0.012 – 0.060 µg/mL.
  • Mouse_IL-18BP-Fc_Chimera_CF_RECOM_1_072921.png
    Recombinant mouse IL-18BP-Fc Chimera binds to immobilized recombinant mouse IL-18 (Cat. No. 767002). The ED50 for this effect is 0.012 – 0.060 µg/mL.
  • Mouse_IL-18BP-Fc_Chimera_CF_RECOM_2_072921.png
    Stability Testing for Recombinant Mouse IL-18BP-Fc Chimera. Recombinant mouse IL-18BP-Fc Chimera was aliquoted in PBS, pH 7.2 at 0.2 mg/mL. One aliquot was frozen and thawed four times (4x Freeze/Thaw) and compared to the control that was kept at 4⁰C (control). The samples were tested for their ability to bind to immobilized recombinant mouse IL-18 (Cat. No. 767002). The ED50 for this effect is 0.012 – 0.060 µg/mL.
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792304 25 µg £109.00
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792306 100 µg £274.00
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IL-18 binding protein (IL-18BP) binds to IL-18 with high affinity (Kd = 400 pM), neutralizes IL-18 activity and binds to IL-18 in a stoichiometric ratio. IL-18 belongs to the Interleukin-1 family and is a potent inflammatory cytokine. IL-18 is secreted by macrophages and dendritic cells and is expressed constitutively even in the absence of an inflammatory stimulus. IL-18 induces IFN-γ production, in the presence of IL-12 or IL-15, from Th1 cells. In addition, IL-18 promotes FasL-mediated cytotoxicity by NK cells. IL-18 has been associated with inflammatory and autoimmune diseases such as emphysema, metabolic syndromes, inflammatory bowel disease, and sepsis among others. IL-37 also interacts with IL-18BP at limiting concentrations of IL-18BP and at a 50- to 100-fold molar excess of IL-37. This interaction increases the inhibitory effect of IL-18BP on IL-18-induced IFN-γ in an NK cell line. IL-18BP knockout (KO) mice have a reduced abundance of splenic NK cells; also, KO mice have shown an increase in immature NK cells and a decrease in mature NK cells. The changes in NK cells are associated with a decrease in circulating plasma IL-18. IL-18 and IL-18BP are elevated in patients with eczema; also, IL-18 and IL-18BP are high in serum of patients with chronic liver disease. In addition, patients with heart failure have shown increases in IL-18 but decreases in IL-18BP levels. Currently, IL-18BP is in a clinical trial for the treatment of adult-onset Still’s disease, an inflammatory disease, which is characterized by high levels of IL-18 in plasma.

Product Details
Technical Data Sheet (pdf)

Product Details

Mouse IL-18BP, amino acid (Thr29-Ala193) (Accession: # Q9Z0M9). The carboxyl terminus contains SR-IEGRMD-mIgG2a-Fc tag, was expressed in CHO cells.
Molecular Mass
The 405 amino acid recombinant protein has a predicted molecular mass of approximately 45.1 kD. The DTT-reduced and non-reduced protein migrates at approximately 70 and 140 kD by SDS-PAGE respectively. The predicted N-terminal amino acid is Thr.
>95%, as determined by Coomassie stained SDS-PAGE.
0.22 µm filtered protein solution is in PBS, pH 7.2.
Endotoxin Level
Less than 0.1 EU per µg cytokine as determined by the LAL method
25 µg size is bottled at 200 µg/mL. 100 µg and larger sizes are lot-specific and bottled at the concentration indicated on the vial (please contact technical support for concentration, or use our Lookup tool if you have a lot number.)
Storage & Handling
Unopened vial can be stored between 2°C and 8°C for up to 2 weeks at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week and stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
Recombinant mouse IL-18BP-Fc Chimera binds to immobilized recombinant mouse IL-18. The ED50 for this effect is 0.012 – 0.060 µg/mL.


Application Notes

BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are validated in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at

Product Citations

Antigen Details


Mononuclear cells, leukocytes, keratinocytes, dermal fibroblasts. IFN-γ induces IL-18BP in colon carcinoma cells, ovarian epitheleal cancer cells, HepG2 cells, HaCaT keratinocyte, and fibroblast-like synovial cells.

Downregulates Th1 responses by binding to IL-18. Controls the cell number and function of NK cells and maintains the levels of circulating IL-18. Regulated by LXR (transcription factor), IL-27, and IFN-γ. Induced by IL-12 in monocytes via IFN-γ.
Recombinant mouse IL-18BP-Fc Chimera binds to immobilized recombinant mouse IL-18.
Antigen References
  1. Paulukat J, et al. 2001. J Immunol. 167:7038.
  2. Veenstra KG, et al. 2002. J Immunology. 168:2282.
  3. Bufler P, et al. 2002. Proc Natl Acad Sci USA. 99:13723.
  4. Mallat Z, et al. 2004. FASEB. 18:1752.
  5. Wittmann M, et al. 2012. PLoS One. 7:e38751.
  6. Dinarello CA, et al. 2013. Front Immunol. 4:289.
  7. Carbotti G, et al. 2013. Clin Cancer Res. 19:4611.
  8. Pourcet B, et al. 2016. Sci Rep. 6:25481.
  9. Hu Y, et al. 2017. Mediators Inflamm. 2017:3090782.
  10. Harms RZ, et al. 2017. Front Immunol. 8:1020.
Gene ID
16068 View all products for this Gene ID
View information about IL-18BP on

Related FAQs

Why choose BioLegend recombinant proteins?

     • Each lot of product is quality-tested for bioactivity as indicated on the data sheet.
     • Greater than 95% Purity or higher, tested on every lot of product.
     • 100% Satisfaction Guarantee for quality performance, stability, and consistency.
     • Ready-to-use liquid format saves time and reduces challenges associated with reconstitution.
     • Bulk and customization available. Contact us.
     • Learn more about our Recombinant Proteins.

How does the activity of your recombinant proteins compare to competitors?

We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!

What is the specific activity or ED50 of my recombinant protein?

The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.

Have your recombinants been tested for stability?

Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.

Does specific activity of a recombinant protein vary between lots?

Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.

How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
Use formula Specific activity (Units/mg) = 10e6/ ED50 (ng/mL)
Go To Top Version: 1    Revision Date: 07/29/2021

For research use only. Not for diagnostic use. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


BioLegend Inc., 8999 BioLegend Way, San Diego, CA 92121
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587

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