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J. Biol. Chem., Vol. 275, Issue 40, 31069-31077, October 6, 2000
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From the In vivo studies suggest that sterol
regulatory element-binding protein (SREBP)-1 plays a key role in
the up-regulation of lipogenic genes in the livers of animals that have
consumed excess amounts of carbohydrates. In light of this, we sought
to use an established mouse hepatocyte cell line, H2-35, to further
define the mechanism by which glucose regulates nuclear SREBP-1 levels. First, we show that these cells transcribe high levels of SREBP-1c that
are increased 4-fold upon differentiation from a prehepatocyte to a
hepatocyte phenotype, making them an ideal cell culture model for the
study of SREBP-1c induction. Second, we demonstrate that the presence
of precursor and mature forms of SREBP-1 protein are positively
regulated by medium glucose concentrations ranging from 5.5 to
25 mM and are also regulated by insulin, with the amount of
insulin in the fetal bovine serum being sufficient for maximal
stimulation of SREBP-1 expression. Third, we show that the increase in
SREBP-1 protein is due to an increase in SREBP-1 mRNA. Reporter
gene analysis of the SREBP-1c promoter demonstrated a
glucose-dependent induction of transcription. In contrast,
expression of a fixed amount of the precursor form of SREBP-1c protein
showed that glucose does not influence its cleavage. Fourth, we
demonstrate that the glucose induction of SREBP could not be reproduced
by fructose, xylose, or galactose nor by glucose analogs 2-deoxy glucose and 3-O-methyl glucopyranose. These data provide
strong evidence for the induction of SREBP-1c mRNA by glucose
leading to increased mature protein in the nucleus, thus providing a
potential mechanism for the up-regulation of lipogenic genes by glucose in vivo.
Sterol Regulatory Element-binding Protein-1 Is Regulated by
Glucose at the Transcriptional Level*
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Department of Metabolic Diseasese,
University of Tokyo, Tokyo 113-8655, Japan and the
¶ Department of Internal Medicine, Institute of Clinical Medicine,
University of Tsukuba, 1-1-1 Tennodai,
Tsukuba, Ibaraki 305-8575, Japan
*
This work was supported in part by Promotion of Fundamental
Studies in Health Science of the Organization for Pharmaceutical Safety
and Research and Health Sciences Research Grants (Research on Human
Genome and Gene Therapy) from the Ministry of Health and Welfare.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.
To whom correspondence should be addressed: Dept. of Internal
Medicine, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan. Fax: 81-298-53-3053; E-mail: shimano-tky@umin.ac.jp.
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