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• W1588224758 abstract "The extracellular domain of the 55-kDa TNF receptor (rsTNFR beta) has been expressed as a secreted protein in baculovirus-infected insect cells and Chinese hamster ovary (CHO)/dhfr- cells. A chimeric fusion protein (rsTNFR beta-h gamma 3) constructed by inserting the extracellular part of the receptor in front of the hinge region of the human IgG C gamma 3 chain has been expressed in mouse myeloma cells. The recombinant receptor proteins were purified from transfected cell culture supernatants by TNF alpha- or protein G affinity chromatography and gel filtration. In a solid phase binding assay rsTNFR beta was found to bind TNF alpha with high affinity comparable with the membrane-bound full-length receptor. The affinity for TNF beta was slightly impaired. However, the bivalent rsTNFR beta-h gamma 3 fusion protein bound both ligands with a significantly higher affinity than monovalent rsTNFR beta reflecting most likely an increased avidity of the bivalent construct. A molecular mass of about 140 kDa for both rsTNFR beta.TNF alpha and rsTNFR beta.TNF beta complexes was determined in analytical ultracentrifugation studies strongly suggesting a stoichiometry of three rsTNFR beta molecules bound to one TNF alpha or TNF beta trimer. Sedimentation velocity and quasielastic light scattering measurements indicated an extended structure for rsTNFR beta and its TNF alpha and TNF beta complexes. Multiple receptor binding sites on TNF alpha trimers could also be demonstrated by a TNF alpha-induced agglutination of Latex beads coated with the rsTNFR beta-h gamma 3 fusion protein. Both rsTNFR beta and rsTNFR beta-h gamma 3 were found to inhibit binding of TNF alpha and TNF beta to native 55- and 75-kDa TNF receptors and to prevent TNF alpha and TNF beta bioactivity in a cellular cytotoxicity assay. Concentrations of rsTNFR beta-h gamma 3 equimolar to TNF alpha were sufficient to neutralize TNF activity almost completely, whereas a 10-100-fold excess of rsTNFR beta was needed for similar inhibitory effects. In view of their potent TNF antagonizing activity, recombinant soluble TNF receptor fragments might be useful as therapeutic agents in TNF-mediated disorders." @default.
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• W1588224758 date "1991-09-01" @default.
• W1588224758 modified "2023-10-02" @default.
• W1588224758 title "Recombinant 55-kDa tumor necrosis factor (TNF) receptor. Stoichiometry of binding to TNF alpha and TNF beta and inhibition of TNF activity." @default.
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• W1588224758 doi "https://doi.org/10.1016/s0021-9258(18)55273-x" @default.
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