Synonyms	Interleukin-18;Iboctadekin;Interferon gamma-inducing factor;IFN-gamma-inducing factor;Interleukin-1 gamma;IL-1 gamma;GIF;IL-18;IL-1g;IL1F4;MGC12320;IL18
Species	Human
Expression_host	E.coli
Sequence	Tyr37-Asp193
Accession	Q14116
Mol_Mass	18.2 kDa
AP_Mol_Mass	15 kDa
Tag	None
Bio_Activity	Measure by its ability to induce IFN gamma secretion in KG-1 cells. The ED₅₀ for this effect is <6 ng/mL.

Properties

Purity	> 95 % as determined by reducing SDS-PAGE.
Endotoxin level	< 0.1 EU per μg of the protein as determined by the LAL method.
Storage	Generally, lyophilized proteins are stable for up to 12 months when stored at -20 to -80℃. Reconstituted protein solution can be stored at 4-8℃ for 2-7 days. Aliquots of reconstituted samples are stable at < -20℃ for 3 months.
Shipping	This product is provided as lyophilized powder which is shipped with ice packs.
Formulation	Lyophilized from a 0.2 μm filtered solution of PBS, pH 8.0. Normally 5 % - 8 % trehalose, mannitol and 0.01% Tween80 are added as protectants before lyophilization. Please refer to the specific buffer information in the printed manual.
Reconstitution	Please refer to the printed manual for detailed information.

Background

Interleukin-18 is a secreted protein and it belongs to the IL-1 family. IL-18 is a proinflammatory cytokine and produced by macrophages and other cells. This cytokine can induce the IFN-gamma production of T cells. The combination of this cytokine and IL12 has been shown to inhibit IL-4 dependent IgE and IgG1 production; and enhance IgG2a production of B cells. IL-18 binding protein (IL18BP) can specifically interact with this cytokine; and thus negatively regulate its biological activity. After stimulation with IL-18; natural killer (NK) cells and certain T cells release another important cytokine called interferon-γ (IFN-γ) or type II interferon that plays an important role in activating the macrophages or other cells.

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