The mature, soluble form of human TNFa was expressed in Pichia pastoris, KM71H. GenBank Accession # P01375, amino acids 77 - 233. For protein verification, the expressed protein was N-terminal sequenced and begins with the following 10 amino acids: VRSSSRTPSD. Purity is >95% by SDS-PAGE analyses.
Activity: The biological activity of recombinant human TNFa was measured by its cytolytic effect on mouse L-929 cells in the presence of Actinomycin D.
Use: For in vitro applications. A dose-response assay should be performed to determine the optimal concentration for specific experiments.
Reconstitution and Dilution: Store lyophilized material at 4°C. Reconstitute in 1 mL of distilled or deionized water. Dilute in a buffer-containing carrier protein, aliquot, and store at or below -70°C, avoiding multiple freeze-thaw cycles. PBS with 1% BSA or a neutral media containing <10% FCS are suitable buffers.
TNF alpha is a multifunctional proinflammatory cytokine that belongs to the tumor necrosis factor (TNF) superfamily. This cytokine is mainly secreted by macrophage and bind to its receptors, TNFRSF1A/TNFR1 and TNFRSF1B/TNFBR. TNF alpha is involved in the regulation of immune cells, cell proliferation, differentiation, apoptosis, lipid metabolism, and coagulation. TNF alpha exists as a multimer of two, three, or five noncovalently linked units, but shows a single 17 kDa band following SDS-PAGE under non-reducing conditions. Knockout studies in mice also suggested the neuroprotective function of TNF alpha, and has been observed to causes tumor necrosis when injected into tumor-bearing mice. Other functions of TNF-alpha include its role in the immune response to bacterial, viral, parasitic and certain fungal infections, as well as its role in the necrosis of specific tumors. TNF alpha causes cytolysis or cytostasis of certain transformed cells, being synergistic with interferon-gamma in its cytotoxicity. This cytokine has been implicated in a variety of diseases, including autoimmune diseases, insulin resistance, and cancer.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Protein Aliases: APC1 protein; C-domain 1; C-domain 2; Cachectin; ICD1; ICD2; Intracellular domain 1; Intracellular domain 2; N-terminal fragment; NTF; TNF alpha; TNF, macrophage-derived; TNF, monocyte-derived; TNF-a; TNF-alpha; Tumor necrosis factor; tumor necrosis factor alpha; tumor necrosis factor ligand 1F; Tumor necrosis factor ligand superfamily member 2; Tumor necrosis factor, membrane form; Tumor necrosis factor, soluble form; tumor necrosis factor-alpha
Gene Aliases: DIF; TNF; TNF-alpha; TNFA; TNFSF2; TNLG1F
UniProt ID: (Human) P01375
Entrez Gene ID: (Human) 7124