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J. Biol. Chem., Vol. 276, Issue 12, 9016-9027, March 23, 2001
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Promoter Suggests a New Mechanism of Transcriptional Regulation by
STAT3*
§,
,
¶,
,
,
, and
**
From the LAP/C/EBP
Department of Gastroenterology and
Hepatology, Medizinische Hochschule Hannover, 30625 Hannover and the
Institute of Clinical Immunology, Universität Leipzig,
04129 Leipzig, Germany
is a member of the C/EBP family of
transcription factors and contributes to the regulation of the acute
phase response in hepatocytes. Here we show that IL-6 controls
LAP/C/EBP
gene transcription and identify an IL-6
responsive element in the LAP/C/EBP
promoter, which contains no
STAT3 DNA binding motif. However, luciferase reporter gene
assays showed that STAT3 activation through the gp130 signal transducer
molecule is involved in mediating IL-6-dependent
LAP/C/EBP
transcription. Southwestern analysis indicated that
IL-6 induces binding of a 68-kDa protein to the recently characterized
CRE-like elements in the LAP/C/EBP
promoter. Transfection
experiments using promoter constructs with mutated CRE-like elements
revealed that these sites confer IL-6 responsiveness. Further analysis
using STAT1/STAT3 chimeras identified specific domains of the protein
that are required for the IL-6-dependent increase in
LAP/C/EBP
gene transcription. Overexpression of
the amino-terminal domain of STAT3 blocked the IL-6-mediated response, suggesting that the STAT3 amino terminus has an important function in
IL-6-mediated transcription of the LAP/C/EBP
gene. These
data lead to a model of how tethering STAT3 to a DNA-bound complex contributes to IL-6-dependent LAP/C/EBP
gene
transcription. Our analysis describes a new mechanism by which STAT3
controls gene transcription and which has direct implication for the
acute phase response in liver cells.
This work is dedicated on the occasion of Prof. Dr. W. Gerok's 75th birthday.
§ Present address: Fraunhofer-Institut, D-30625 Hannover, Germany. ¶ Present address: Dianova, D-20354 Hamburg, Germany. ** To whom correspondence should be addressed: Dept. of Gastroenterology and Hepatology, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany. Tel.: 49-511-532-3489; Fax: 49-511-532-4896; E-mail: trautwein.christian@mh-hannover.de.This article has been cited by other articles:
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