Activation of protein kinase Cη by type I interferons

Amanda J. Redig, Antonella Sassano, Beata Majchrzak-Kita, Efstratios Katsoudilis, Hui Liu, Jessica K. Altman, Eleanor N. Fish, Amittha Wickrema, Leonidas C. Platanias*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Type I interferons (IFNs) are cytokines with diverse biological properties, including antiviral, growth inhibitory, and immuno-modulatory effects. Although several signaling pathways are activated during engagement of the type I IFN receptor and participate in the induction of IFN responses, the mechanisms of generation of specific signals for distinct biological effects remain to be elucidated. We provide evidence that a novel member of the protein kinase C (PKC) family of proteins is rapidly phosphorylated and activated during engagement of the type I IFN receptor. In contrast to other members of the PKC family that are also regulated by IFN receptors, PKCη does not regulate IFN-inducible transcription of interferon-stimulated genes or generation of antiviral responses. However, its function promotes cell cycle arrest and is essential for the generation of the suppressive effects of IFNα on normal and leukemic human myeloid (colony-forming unit-granulocyte macrophage) bone marrow progenitors. Altogether, our studies establish PKCη as a unique element in IFN signaling that plays a key and essential role in the generation of the regulatory effects of type I IFNs on normal and leukemic hematopoiesis.

Original languageEnglish (US)
Pages (from-to)10301-10314
Number of pages14
JournalJournal of Biological Chemistry
Issue number16
StatePublished - Apr 17 2009

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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