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J. Biol. Chem., Vol. 275, Issue 35, 27117-27122, September 1, 2000
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From the Hepatocyte nuclear factor 1
Regulation of the Liver Fatty Acid-binding Protein Gene by
Hepatocyte Nuclear Factor 1
(HNF1
)
ALTERATIONS IN FATTY ACID HOMEOSTASIS IN
HNF1
-DEFICIENT MICE*
,
¶
Laboratory of Metabolism, National
Institutes of Health, Bethesda, Maryland 20892 and the
§ Veterinary and Tumor Pathology Section, Office of
Laboratory Animal Science, NCI-Frederick Cancer Research and
Development Center, National Institutes of Health,
Frederick, Maryland 21702
(HNF1
)-null mice have enlarged fatty livers and
alterations in the expression of genes encoding enzymes involved in the
synthesis, catabolism, and transport of fatty acids. Elevations in the
expression of genes encoding fatty acid synthetic enzymes (fatty acid
synthase and acyl-CoA carboxylase) and peroxisomal
-oxidation
enzymes (CYP4A3, bifunctional enzyme, and thiolase) were observed in
the livers of HNF1
-null mice, whereas hepatic mitochondrial
-oxidation gene (medium and short chain acyl-CoA dehydrogenase)
expression levels remain unchanged relative to HNF1
-heterozygous
controls. An elevation in the levels of fatty acid transporter
gene expression was also observed. In contrast, there was a marked
reduction of liver fatty acid-binding protein (L-FABP) gene
expression in the livers of HNF1
-null mice. Isolation and sequence
analysis of the 5'-flanking region of the mouse L-FABP gene
revealed the presence of two HNF1
regulatory elements. The results
of transient transfection studies indicate that HNF1
is required to
trans-activate the expression of the L-FABP promoter. Taken
together, these data define a critical role for HNF1
in the
pathogenesis of a phenotype marked by fatty infiltration of the liver
and in the regulation of the L-FABP gene, the expression of
which may have a direct impact on the maintenance of fatty acid homeostasis.
*
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.
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