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. 1988 Jul;85(14):5122–5125. doi: 10.1073/pnas.85.14.5122

Interferon-gamma-induced transcriptional activation is mediated by protein kinase C.

X D Fan 1, M Goldberg 1, B R Bloom 1
PMCID: PMC281700  PMID: 3134657

Abstract

Interferon-gamma (IFN-gamma) regulates a variety of biological functions and is the principal lymphokine known to activate macrophages. In studies of the molecular mechanisms by which these cells are regulated by IFN-gamma, the transcriptional activation of an IFN-gamma-inducible gene, gamma.1, in human macrophage-like cell lines was examined. Transcription of this gene is rapidly induced by 0.1-1 unit of IFN-gamma. In addition, gamma.1 transcription is efficiently induced by phorbol 12-myristate 13-acetate, which is known to activate protein kinase C (PKC). Both stimulators of gamma.1 transcription induce the translocation of PKC from the cytosol of a membrane fraction. Two selective inhibitors of PKC, H7 and sphingosine, suppressed not only the induction of gamma.1 mRNA but transcription of HLA-DR by IFN-gamma as well. These findings establish that PKC plays a significant role in the signal transduction pathway leading to transcriptional activation of some IFN-gamma-regulated genes of cells of the mononuclear phagocyte lineage.

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