Human IL-18 BPa Antibody

Catalog # Availability Size / Price Qty
Detection of Human IL‑18 BPa by Western Blot.
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Product Details
Citations (4)
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Reviews (2)

Human IL-18 BPa Antibody Summary

Species Reactivity
Detects human IL‑18 BPa in direct ELISAs and Western blots.
Polyclonal Goat IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human IL-18 BPa
Accession # O95998
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
Endotoxin Level
<0.10 EU per 1 μg of the antibody by the LAL method.


Recommended Concentration
Western Blot
0.5 µg/mL
See below

This antibody functions as an ELISA detection antibody when paired with Rabbit Anti-Human IL‑18/IL‑1F4 Monoclonal Antibody (Catalog # MAB91244).

This product is intended for assay development on various assay platforms requiring antibody pairs. We recommend the Human IL-18/IL-18 BPa Complex DuoSet ELISA Kit (Catalog # DY8936-05) for convenient development of a sandwich ELISA or the Human IL-18 BPa Quantikine ELISA Kit (Catalog # DBP180) for a complete optimized ELISA.

Measured by its ability to neutralize IL‑18 BPa inhibition of IL‑18/IL‑1F4-induced IFN‑ gamma secretion in the KG‑1 human acute myelogenous leukemia cell line. The Neutralization Dose (ND50) is typically 1-5 µg/mL in the presence of 0.1 µg/mL Recombinant Human IL‑18 BPa Fc Chimera, 40 ng/mL Recombinant Human IL‑18/IL‑1F4, and 20 ng/mL Recombinant Human TNF‑ alpha.

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Western Blot Detection of Human IL-18 BPa antibody by Western Blot. View Larger

Detection of Human IL‑18 BPa by Western Blot. Western blot shows conditioned media from HUVEC human umbilical vein endothelial cells untreated (-) or treated (+) with 50 ng/mL Recombinant Human IFN-gamma (Catalog # 285-IF) and 40 ng/mL Recombinant Human TNF-alpha (210-TA) for 48 hours. PVDF membrane was probed with 0.5 µg/mL of Goat Anti-Human IL-18 BPa Antigen Affinity-purified Polyclonal Antibody (Catalog # AF119) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF109). A specific band was detected for IL-18 BPa at approximately 50 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

Neutralization IL‑18 BPa Inhibition of IL‑18/ IL‑1F4-induced IFN‑ gamma  Secretion and Neutralization by Human IL‑18 BPa Antibody. View Larger

IL‑18 BPa Inhibition of IL‑18/ IL‑1F4-induced IFN‑ gamma Secretion and Neutralization by Human IL‑18 BPa Antibody. Recombinant Human IL-18 BPa Fc Chimera (119-BP) inhibits Recombinant Human IL-18/IL-1F4 induced IFN-gamma secretion in the KG-1 human acute myelogenous leukemia cell line in a dose-dependent manner (orange line), as measured by the Human IFN-gamma Quantikine ELISA Kit (DIF50C). Inhibition of Recombinant Human IL-18/IL-1F4 (40 ng/mL) activity elicited by Recombinant Human IL-18 BPa Fc Chimera (0.1 µg/mL) is neutralized (green line) by increasing concentrations of Goat Anti-Human IL-18 BPa Antigen Affinity-purified Polyclonal Antibody (Catalog # AF119). The ND50 is typically 1-5 µg/mL in the presence of Recombinant Human TNF-alpha (20 ng/mL).

Human IL‑18/IL-18 BPa Complex ELISA Standard Curve. Recombinant Human IL-18/IL-18 BPa complex protein was serially diluted 2-fold and captured by Rabbit Anti-Human IL-18/IL-1F4 Monoclonal Antibody (Catalog # MAB91244) coated on a Clear Polystyrene Microplate (Catalog # DY990). Goat Anti-Human IL-18 BPa Antigen Affinity-purified Polyclonal Antibody (Catalog # AF119) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (Catalog # DY998) followed by Substrate Solution (Catalog # DY999) and stopping the enzymatic reaction with Stop Solution (Catalog # DY994).

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: IL-18 BPa

Interleukin 18 binding protein (IL-18 BP) is a secreted glycoprotein, which functions as an IL-18 antagonist by binding to IL-18 and blocking its biological activity. IL‑18 BP bears no amino acid sequence homology to the membrane-associated IL-18 and IL-1 receptor proteins. The gene for human IL-18 BP has been localized to chromosome 11q13. It encodes for at least four isoforms by alternative splicing. The IL-18 BP isoforms a and c each contain one immunoglobulin (Ig)-like C2-type domain while isoforms b and d lack a complete Ig domain. The complete Ig domain has been shown to be essential to the binding and neutralizing properties of the binding proteins. Two isoforms of mouse IL18 BP (c and d) containing the complete Ig domain have also been isolated and shown to neutralize IL-18 bioactivity. Human and mouse IL-18 BPs share approximately 61% amino acid sequence identity. Several poxviruses also encode proteins with sequence similarity to the human and mouse IL-18 BP. Viral IL-18 BPs have been shown to bind and inhibit IL-18 responses and may be involved in modulating host immune responses. The expression of IL-18 BP is markedly up-regulated by IFN-gamma, suggesting that IL-18 activity is modulated by a negative feedback mechanism mediated by IL-18 BP.

  1. Mühl, H. et al. (2000) Biochem. Biophys. Res. Commun. 267:960.
  2. Kim, S-H. et al. (2000) Proc. Nat. Acad. Sci. USA 97:1190.
  3. Calderara, S. et al. (2001) Virology 279:22.
Long Name
Interleukin 18 Binding Protein Isoform a
Entrez Gene IDs
10068 (Human); 84388 (Rat); 107126419 (Cynomolgus Monkey)
Alternate Names
IL18 BPa; IL-18 BPa; IL18BP; IL-18BP; IL18BPa; interleukin 18 binding protein; interleukin-18-binding protein; MC51L-53L-54L homolog gene product; tadekinig-alfa

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Citations for Human IL-18 BPa Antibody

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

4 Citations: Showing 1 - 4
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  1. Inherited IL-18BP deficiency in human fulminant viral hepatitis
    Authors: Serkan Belkaya, Eleftherios Michailidis, Cecilia B. Korol, Mohammad Kabbani, Aurélie Cobat, Paul Bastard et al.
    Journal of Experimental Medicine
  2. Regulation and function of adiponectin in the intestinal epithelial cells in response to Trichinella spiralis infection
    Authors: Jeerawattanawart, S;Hansakon, A;Roytrakul, S;Angkasekwinai, P;
    Scientific reports
    Species: Mouse
    Sample Types: Whole Cells
    Applications: Neutralization
  3. Differentiation of human SH-SY5Y neuroblastoma cells by all-trans retinoic acid activates the interleukin-18 system.
    Authors: Sallmon H, Hoene V, Weber SC, Dame C
    J. Interferon Cytokine Res., 2010-02-01;30(2):55-8.
    Species: Human
    Sample Types: Cell Lysates
    Applications: Western Blot
  4. Generation and characterization of mice transgenic for human IL-18-binding protein isoform a.
    Authors: Fantuzzi G, Banda NK, Guthridge C, Vondracek A, Kim SH, Siegmund B, Azam T, Sennello JA, Dinarello CA, Arend WP
    J. Leukoc. Biol., 2003-08-11;74(5):889-96.
    Species: Human
    Sample Types: Serum
    Applications: ELISA Development


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Human IL-18 BPa Antibody
By Anonymous on 11/09/2017
Application: ELISA Sample Tested: Cell culture supernatant Species: Human

MAB1192 was used as the capture and AF119 was used as the detection antibody for the sandwich ELISA for IL-18PB. The immunoassay standard was 119-BP. Assay had sensitivity of ~10pg/ml.

Human IL-18 BPa Antibody
By Anonymous on 11/04/2017
Application: ELISA Sample Tested: CHO Chinese hamster ovary cell line Species: Hamster