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J. Biol. Chem., Vol. 278, Issue 8, 5597-5604, February 21, 2003
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From the Institute of Anatomy II, Medical School, Friedrich
Schiller University, D-07740 Jena, Germany, the
§ Department of Virology, Medical School Charité,
Humboldt University, D-10098 Berlin, Germany, and the
¶ Department of Genome Analysis, Institute of Molecular
Biotechnology, D-07749 Jena, Germany
The molecular mechanisms underlying the
regulation of interleukin (IL)-10 transcription in monocytic cells by
various stimuli during inflammation and the stress reaction are not
fully understood. Recently, we provided evidence that stress-induced
IL-10 promoter activation in monocytic cells is mediated by
catecholamines via a cAMP-dependent signaling pathway
including CREB/ATF (cAMP-responsive element binding protein/activating
transcription factor) binding to two CRE motifs. However, the mutation
of these sites diminished cAMP responsiveness by only 50%, suggesting
a role for additional transcription factors and elements in the
cAMP-dependent regulation of the human IL-10 promoter. Here, we
analyze the functional role of one such factor, C/EBP, in two cell
lines of myelomonocytic origin, THP-1 and HL-60, which are known
to differ in their differentiation status and C/EBP protein content. We
show that the level of basal as well as cAMP-stimulated IL-10
transcription depends on the expression of C/EBP
cAMP-induced Interleukin-10 Promoter Activation Depends on
CCAAT/Enhancer-binding Protein Expression and Monocytic
Differentiation*
,
§,
and
and their
binding to three motifs in the promoter/enhancer region. The C/EBP5
motif, which is located between the TATA-box and the translation start
point, is essential for the C/EBP-mediated constitutive and most of the
cAMP-stimulated expression as its mutation nearly abolished IL-10
promoter activity. Our results suggest a dominant role of C/EBP
transcription factors relative to CREB/ATF in tissue-specific and
differentiation-dependent IL-10 transcription.
*
This work was supported by Deutsche Forschungsgemeinschaft
Pl 163/4-3.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Both authors contributed equally to this work.
To whom correspondence should be addressed. Tel.:
49-3641-938570; Fax: 49-3641-938552; E-mail:
cplatzer@mti-n.uni-jena.de.
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