CD40L or CD154 is a membrane glycoprotein and differentiation antigen expressed on the surface of T-cells. The CD40 ligand stimulates B-cell proliferation and secretion of all immunoglobulin isotypes in the presence of cytokines. CD40 ligand has been shown to induce cytokine production and tumoricidal activity in peripheral blood monocytes. It also costimulates proliferation of activated T-cells and this is accompanied by the production of IFN-gamma, TNF-alpha, and IL2.||Source:|Recombinant protein corresponding to 149aa of human sCD40, expressed in E. coli. ||Molecular Weight: |~16.31kD \t||Biological Activity:|The ED50, as determined by the dose-dependant stimulation of IL-12 and IL-8 induction by PMB (Peripheral Mononuclear) cells, was found to be 5-10ng/ml. \t||AA Sequence: \t|The sequence of the first five N-terminal amino acids was determined and was found to be Met-Gln-Lys-Gly-Asp. \t||Protein Content: |Protein quantitation was carried out by two independent methods: |1. UV spectroscopy at 280nm using the absorbency value of 1.1 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics). |2. Analysis by RP-HPLC, using a standard solution of soluble sCD40 as a Reference Standard. \t||Storage and Stability:|Lyophilized powder may be stored at -20°C. Stable for 12 months after receipt at -20°C. Reconstitute with ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Reconstituted product is stable for 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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