title: IFN-alpha induced human 78 kD protein: purification and homologies with the mouse Mx protein, production of monoclonal antibodies, and potentiation effect of IFN-gamma.
abstract: A 78-kD protein (p78) is induced in human cells in response to interferon (IFN). It appeared as a radioactive spot when newly synthesized proteins from IFN-treated human cells labeled with [35S]methionine were separated in a two-dimensional system and autoradiographed. p78 was induced by IFN-alpha in normal human fibroblasts, and in some, but not all, established human tumor cell lines. It has been purified to homogeneity from Namalwa cells induced by recombinant IFN-alpha. Mouse polyclonal and monoclonal antibodies specific to p78 have been produced which allowed its quantitative determination in a Western blot ELISA. Using this method it was also shown that although IFN-gamma was a poor inducer of p78, it markedly increased the effect of IFN-alpha on p78 induction and accumulation. It was also demonstrated that p78 and the protein Mx of influenza-resistant mice, which we purified and characterized earlier (Horisberger and Hochkeppel, J. Biol. Chem. 260, 1730-1733, 1985) share common properties such as size, pI, amino acid composition, antigenic determinant(s), and IFN inducibility.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002460:Cell Line; D004357:Drug Synergism; D019204:GTP-Binding Proteins; D006801:Humans; D007370:Interferon Type I / Q000494:pharmacology*; D007371:Interferon-gamma / Q000494:pharmacology; D051379:Mice; D008970:Molecular Weight; D064547:Myxovirus Resistance Proteins; D014176:Protein Biosynthesis; D011506:Proteins / Q000276:immunology / Q000302:isolation & purification; D013045:Species Specificity
chemical_list: D000911:Antibodies, Monoclonal; D007370:Interferon Type I; C579070:Mx1 protein, mouse; D064547:Myxovirus Resistance Proteins; D011506:Proteins; D007371:Interferon-gamma; D019204:GTP-Binding Proteins