Acute-phase reaction induces a specific complex between hepatic nuclear proteins and the interleukin 6 response element of the rat α2-macroglobulin gene

Masahira Hattori, Lawrence J. Abraham, Wolfgang Northemann, Georg H. Fey

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

Interleukin 6 (IL-6) was established as a transcriptional inducer of the rat α2-macroglobulin gene, a prototype liver acute-phase gene. Maximum induction occurred when the 5′ flanking sequences of this gene (position -209 to -43) directed expression from the gene's own TATA box and transcription start site. Removal of the hexanucleotide CTGGGA (position -164 to -159) abolished 60-70% of the hormonal induction in FAO1 rat hepatoma cells. This hexanucleotide was defined as the IL-6 response element (IL-6-RE). The IL-6-RE is well conserved in the cytokine-responsive regions of other acute-phase genes and serves as a binding site for nuclear proteins. A characteristic DNA-protein complex (complex I) was formed with nuclear proteins from normal rat livers. A different, hormone-inducible complex (complex II) was assembled specifically with nuclear proteins from acute-phase rat livers or from IL-6-treated human Hep 3B hepatoma cells. Complex II was competitively inhibited by oligonucleotides representing the conserved IL-6-RE sequence from other acute-phase genes. Thus, the proteins building complex II likely participate in a general signal transduction mechanism mediating the transcriptional activation by IL-6 of several acute-phase genes.

Original languageEnglish
Pages (from-to)2364-2368
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume87
Issue number6
Publication statusPublished - 1990 Mar
Externally publishedYes

Keywords

  • Acute-phase genes
  • Cytokines
  • Inflammation
  • Liver gene regulation

ASJC Scopus subject areas

  • Genetics
  • General

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