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J. Biol. Chem., Vol. 276, Issue 34, 32122-32128, August 24, 2001
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to HNF-1
*
,
From the Division of Gastroenterology, Department of Medicine,
University of Pennsylvania, Philadelphia, Pennsylvania 19104
The mouse sucrase-isomaltase (SI) gene is
an enterocyte-specific gene expressed in a complex developmental
pattern. We previously reported that a short, evolutionarily conserved
gene promoter regulates developmental expression of SI in mouse small
intestine. Herein, we investigated the role of a hepatocyte nuclear
factor-1 (HNF-1) cis-acting element to regulate SI gene
expression in vivo. Transgenic SI gene constructs with a
mutated HNF-1 element (SIF3) revealed a strong reduction in promoter
activity in comparison with a wild-type construct in mice and during
Caco-2 cell differentiation. Nuclear proteins isolated from enterocytes
showed increased binding of the HNF-1
complex with a concomitant
decrease in the HNF-1
-containing complex to the SIF3 element both
during the suckling-weaning developmental transition and Caco-2 cell
differentiation. These changes coincided with a strong induction of SI
gene transcription. In transfection experiments, HNF-1
activated the
SI promoter via the SIF3 element, and co-expression of HNF-1
impaired this transcriptional activation. These findings demonstrate
the essential role of the HNF-1 regulatory element to support SI gene
transcription in vivo and suggest that the ratio of
HNF-1
to HNF-1
plays a role in the transcriptional activity of
this gene during intestinal development.
work was supported by RO1-DK46704 (to P.G.T.) and the Molecular Biology Core of the Center for Molecular Studies in Digestive Diseases at the University of Pennsylvania (P30-DK50306).
Supported by a postdoctoral fellowship from the "Fonds de la
Recherche en Santé du Québec."
§
To whom correspondence should be addressed: 709 Swedeland Rd., P.O.
Box 1539, King of Prussia, PA 19406-0939. Tel.: 610-270-6016; Fax:
610-270-6116; E-mail: Peter_G_Traber@sbphrd.com.
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