A nuclear factor for interleukin-6 expression (NF-IL6) and the glucocorticoid receptor synergistically activate transcription of the rat alpha 1-acid glycoprotein gene via direct protein-protein interaction.

Molecular and Cellular Biology
Y NishioS Akira

Abstract

The acute-phase reaction is accompanied by an increase in a variety of serum proteins, named acute-phase proteins. The synthesis of these proteins is synergistically controlled by glucocorticoids and inflammatory cytokines such as interleukin-1 (IL-1), IL-6, and tumor necrosis factor alpha. Recently, we have cloned nuclear factor-IL-6 (NF-IL6), a transcription factor that activates the IL-6 gene, and have demonstrated its involvement in the expression of acute-phase-protein genes. We report here an analysis of the molecular mechanisms by which inflammatory cytokines and glucocorticoid act synergistically to activate expression of the rat alpha 1-acid glycoprotein (AGP) gene. We found that NF-IL6 and ligand-activated rat glucocorticoid receptor acted synergistically to transactivate the AGP gene and that maximal transcriptional activation of the AGP gene required expression of both intact NF-IL6 and rat glucocorticoid receptor. Surprisingly, however, transcriptional synergism was still observed even when one of the two factors lacked either its DNA-binding or transcriptional-activation function. We present evidence for a direct protein-protein interaction between these two distinct transcription factors and propose that this may...Continue Reading

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