Protein Kinase C Is Involved in the Early Signals of Interferon-α But Not of Interferon-γ in U937 Cells

Peter Csermely, Elizabeth Balint, Philip M. Grimley, Adorjan Aszalos

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Increasing interest is being focused on the role of protein kinase C (PKC) in the mode of action of interferons (IFNs). Here we report that IFN-α induced a transient translocation of PKC from the cytosol to the particulate fraction of U937 cells. In contrast, after IFN-γ treatment, no significant change in PKC activity could be observed. IFN-induced changes in membrane potential were also examined by means of a potential sensitive oxonol dye and flow cytometry. Hyperpolarization was induced by both IFN-α and IFN-γ. The protein kinase inhibitor H-7 blocked the hyperpolarization induced by IFN-α but not by IFN-γ. These concordant results suggest that PKC is involved in the early signals of IFN-α but not of IFN-γ in U937 cells.

Original languageEnglish
Pages (from-to)605-611
Number of pages7
JournalJournal of Interferon Research
Issue number6
Publication statusPublished - Jan 1 1990


ASJC Scopus subject areas

  • Immunology
  • Virology

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