Leadgene Leadgene
LeadGMP® Human IL-18 Protein, Tag Free, E. coli
More Images
Catalog Number


More Documents
Loading package & price...
  • Specifications
    • Species of Origin


      Expression system

      Escherichia coli

    • Affinity Tag

      Tag Free


      Lyophilized from a 0.2 µm filtered solution of PBS, pH 7.4.

    • Purity

      >97% as determined by SDS-PAGE analysis.

      Molecular weight

      The protein has a calculated MW of 18.2 kDa.
      The protein migrates as 15 kDa under reducing condition (SDS-PAGE analysis).

    • Activity

      Measure by its ability to induce IFN gamma secretion in KG-1 cells. The ED₅₀ for this effect is <6 ng/mL. The specific activity of recombinant LeadGMP® human IL-18 is > 1 x 10⁷ IU/mg, which is calibrated against the human IL-18 WHO Reference Reagent (NIBSC code: 03/200).

      Endotoxin level

      <0.05 EU per 1 µg of the protein by the LAL method.

    • Mycoplasma

      Not detected



  • Background
    • Background

      Interleukin-18 (IL-18) belongs to the IL-1 superfamily and is constitutively produced by macrophages, dendritic cells (DCs) and other cells. IL-18 binds to the receptor of IL-18 (IL-18R) and initiate the recruitment and heterodimerization of the IL-18RAcP, leading to downstream activation of NF-κB. After stimulation with IL-18, multiple cytokines including IFN-γ, IL-13, IL-4, IL-8, and GM-CSF and both Th1 and Th2 lymphokines could be produced by different cells. As an immunoregulaory cytokine, IL-18 can promote development of T helper 1 (Th1) cells, which maximizes the production of IFN by synergistically stimulating to mature Th1 effectors in combination with IL-12. On the contrary, it inhibits the production of the anti-inflammatory cytokine IL-10. In addition, IL-18 exhibits multiple proinflammatory functions, such as increases in cell adhesion molecules, nitric oxide synthesis, and chemokine production.


      Interleukin-18, Iboctadekin, Interferon gamma-inducing factor, IFN-gamma-inducing factor, Interleukin-1 gamma , IL-1 gamma

    • Uniprot ID


      Sequence Note


  • Instruction
    • Reconstitution

      It is recommended to reconstitute the lyophilized protein in sterile H₂O to a concentration not less than 0.5 mg/mL and incubate the stock solution for at least 20 min to ensure sufficient re-dissolved.


      The product is shipped with polar packs. Upon receipt, store it immediately at -20°C or lower for long term storage.

    • Stability & Storage

      This product is stable after storage at:

      • -20°C for 12 months in lyophilized state from date of receipt.
      • -20°C or -80°C for 1 month under sterile conditions after reconstitution.

      Avoid repeated freeze/thaw cycles.

      Manufacturing specifications

      LeadGMP® recombinant proteins are manufactured in ISO 13485:2016 and GMP certified facility. The processes include:

      • Animal-free reagent and laboratory
      • Manufactured and tested under GMP guideline
      • Testing and traceability of raw material
      • Records of the maintenance and equipment calibration
      • Personnel training records
      • Batch-to-batch consistency
      • Documentation of QA control and process changes
      • Manufactured and tested under an ISO 13485:2016 certified quality management system
      • Stability monitor of product shelf-life
  • Image
    LeadGMP® Human IL-18 Protein, Tag Free, E. coli (LDG025PHE-GMP) induces IFN gamma secretion in KG-1 cells, with the ED50 &lt; 6 ng/mL.

    LeadGMP® Human IL-18 Protein, Tag Free, E. coli (LDG025PHE-GMP) induces IFN gamma secretion in KG-1 cells, with the ED50 < 6 ng/mL.

    SDS-PAGE analysis of LeadGMP® IL-18, Human

    SDS-PAGE analysis of LeadGMP® IL-18, Human

    Total   (2)
  • Review

    Help others learn more about this product. Use the link below to share your experience.

  • Publication

    There are currently no publications. Use the link below to let us know.

  • Datasheet & Documents

Disclaimer:For Research Use or Further Manufacturing Only.

This site uses cookies as described in our Privacy Policy in order to improve your user experience and deliver customized advertising to you. Click “I Agree” to consent and continue.