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Cell Growth & Differentiation, Vol 6, Issue 7 879-890, Copyright © 1995 by American Association of Cancer Research


ARTICLES

Cytokine regulation of the liver transcription factor hepatocyte nuclear factor-3 beta is mediated by the C/EBP family and interferon regulatory factor 1

U Samadani, A Porcella, L Pani, PF Johnson, JB Burch, R Pine and RH Costa
Department of Biochemistry, University of Illinois at Chicago 60612-7334, USA.

Three distinct hepatocyte nuclear factor-3 (HNF-3) proteins (alpha, beta, and gamma) regulate the transcription of numerous liver-enriched genes. The HNF-3 proteins bind DNA via a homologous winged helix motif common to a number of proteins known to be critical for determination events in embryogenesis. We have demonstrated previously that two binding sites in the -184 HNF-3 beta promoter are recognized by widely distributed factors and that there is also a critical autoregulatory site, we identified a binding site for a cell-specific factor, LF-H3 beta, that may function in restricting HNF-3 beta gene expression to hepatocytes. Our present study demonstrates that members of the C/EBP and proline and acidic amino acid-rich subfamilies of basic region leucine zipper transcription factors bind the LF-H3 beta site, and cotransfection of HepG2 cells shows that these factors are able to activate an HNF-3 beta promoter reporter construct. The LF-H3 beta-C/EBP binding sequence also confers HNF-3 beta promoter stimulation in response to interleukin (IL)-1 and IL-6. Upstream of this HNF-3 beta proximal promoter region, an IFN-stimulated response element core sequence (-231 to -210) was found that mediates transcriptional induction by IFN-gamma but not IFN-alpha. Gel mobility supershift assay demonstrates that an IFN-gamma-induced protein-DNA complex is disrupted by an antibody specific for interferon regulatory factor-1/interferon-stimulated gene factor-2. Consistent with this finding, we observed that IFN-gamma induction requires ongoing protein synthesis. Surprisingly, the effect of the three cytokines (IL-1, IL-6, and IFN-gamma) in combination as assayed by the same model is not synergistic. HNF-3beta joins the C/EBP family on the list of liver-enriched transcription factors, the expression of which is modulated by cytokines.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1995 by the American Association of Cancer Research.