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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.
AuthorsM A Horisberger, H K Hochkeppel
JournalJournal of interferon research (J Interferon Res) Vol. 7 Issue 4 Pg. 331-43 (Aug 1987) ISSN: 0197-8357 [Print] UNITED STATES
PMID3117906 (Publication Type: Comparative Study, Journal Article)
Chemical References
  • Antibodies, Monoclonal
  • Interferon Type I
  • Mx1 protein, mouse
  • Myxovirus Resistance Proteins
  • Proteins
  • Interferon-gamma
  • GTP-Binding Proteins
Topics
  • Animals
  • Antibodies, Monoclonal
  • Cell Line
  • Drug Synergism
  • GTP-Binding Proteins
  • Humans
  • Interferon Type I (pharmacology)
  • Interferon-gamma (pharmacology)
  • Mice
  • Molecular Weight
  • Myxovirus Resistance Proteins
  • Protein Biosynthesis
  • Proteins (immunology, isolation & purification)
  • Species Specificity

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