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Product last modified at: 2024-12-16T14:15:20.222Z
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Human TNF-α Recombinant Protein #16769

    Product Information

    Storage

    Human TNF-α Recombinant Protein is supplied as lyophilized material that is very stable at -20°C. It is recommended to reconstitute with sterile water at a concentration of 0.1 mg/mL which can be further diluted in aqueous solutions as needed. Addition of a carrier protein (0.1% HSA or BSA) is recommended for long-term storage.

    Once in solution, store at 4°C and use within 1 month, or store at -20ºC to -80ºC and use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles if storing reconstituted material at -20ºC to -80ºC.

    Product Description

    MW (kDa) 17.5
    Purity A greater than or equal to 95% purity was determined by SDS-PAGE.
    Endotoxin Endotoxin levels are less than or equal to 1 EU / 1 μg hTNF-α.
    Activity The bioactivity of recombinant hTNF-α was determined in a cell proliferation assay measuring the cytolysis of mouse L929 cells in the presence of Actinomycin D. The ED50 of each lot is less than or equal to 2 ng/mL.

    Source / Purification

    Recombinant human TNF-α was expressed in E. coli and is supplied in a lyophilized form.

    Background

    TNF-α, the prototypical member of the TNF protein superfamily, is a homotrimeric type-II membrane protein (1,2). Membrane bound TNF-α is cleaved by the metalloprotease TACE/ADAM17 to generate a soluble homotrimer (2). Both membrane and soluble forms of TNF-α are biologically active. TNF-α is produced by a variety of immune cells, including T cells, B cells, NK cells, and macrophages (1). Cellular response to TNF-α is mediated through interaction with receptors TNF-R1 and TNF-R2 and results in activation of pathways that favor both cell survival and apoptosis depending on the cell type and biological context. Activation of kinase pathways (including JNK, ERK (p44/42), p38 MAPK, and NF-κB) promotes the survival of cells, while TNF-α-mediated activation of caspase-8 leads to programmed cell death (1,2). TNF-α plays a key regulatory role in inflammation and host defense against bacterial infection, notably Mycobacterium tuberculosis (3). The role of TNF-α in autoimmunity is underscored by blocking TNF-α action to treat rheumatoid arthritis and Crohn’s disease (1,2,4).
    For Research Use Only. Not For Use In Diagnostic Procedures.
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