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Originally published In Press as doi:10.1074/jbc.M001286200 on July 21, 2000
J. Biol. Chem., Vol. 275, Issue 39, 30232-30239, September 29, 2000
C/EBP Regulates Hepatic Transcription of 11 -Hydroxysteroid
Dehydrogenase Type 1
A NOVEL MECHANISM FOR CROSS-TALK BETWEEN THE C/EBP AND
GLUCOCORTICOID SIGNALING PATHWAYS*
Louise J. S.
Williams §,
Val
Lyons ,
Iolaina
MacLeod ,
Vidya
Rajan ,
Gretchen J.
Darlington¶,
Valeria
Poli ,
Jonathan R.
Seckl , and
Karen E.
Chapman **
From the Molecular Endocrinology group, University of
Edinburgh, Molecular Medicine Centre, Western General Hospital, Crewe
Road, Edinburgh EH4 2XU, United Kingdom, the ¶ Huffington Center
on Aging, N805, Baylor College of Medicine, Houston, Texas 77030, and
the Department of Biochemistry, University of Dundee, Dundee DD1
4HN, United Kingdom
Glucocorticoid action within individual cells is
potently modulated by 11 -hydroxysteroid dehydrogenase (11 -HSD),
which, by interconverting active and inert glucocorticoids, determines steroid access to receptors. Type 1 11 -HSD (11 -HSD1) is highly expressed in liver where it regenerates glucocorticoids, thus amplifying their action and contributing to induction of
glucocorticoid-responsive genes, most of which are also regulated by
members of the C/EBP (CAAT/enhancer-binding protein) family of
transcription factors. Here we demonstrate that C/EBP is a potent
activator of the 11 -HSD1 gene in hepatoma cells and that
mice deficient in C/EBP have reduced hepatic 11 -HSD1
expression. In contrast, C/EBP is a relatively weak activator
of 11 -HSD1 transcription in hepatoma cells and
attenuates C/EBP induction, and mice that lack C/EBP have
increased hepatic 11 -HSD1 mRNA. The 11 -HSD1
promoter (between 812 and +76) contains 10 C/EBP binding sites,
and mutation of the promoter proximal sites decreases the C/EBP
inducibility of the promoter. One site encompasses the transcription
start, and both C/EBP and C/EBP are present in complexes formed
by liver nuclear proteins at this site. The regulation of 11 -HSD1
expression, and hence intracellular glucocorticoid levels, by members
of the C/EBP family provides a novel mechanism for cross-talk between the C/EBP family of transcription factors and the glucocorticoid signaling pathway.
*
This work was supported by a Medical Research Council
project grant (to K. E. C. and J. R. S.), a Wellcome Trust program
grant, and a Wellcome Senior Clinical Research Fellowship (to
J. R. S.).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.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) Y10420.
§
Current address, Endocrine Unit, Massachusetts General Hospital,
BUL-327, Boston, MA 02114.
**
To whom correspondence should be addressed: Tel.: 44-131-651-1033;
Fax: 44-131-651-1085; E-mail: karen.chapman@ed.ac.uk.
Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2000 by the American Society for Biochemistry and Molecular Biology.
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