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J Biol Chem, Vol. 274, Issue 47, 33412-33418, November 19, 1999
From the Department of Medical and Molecular Genetics and the
Walther Oncology Center, Indiana University School of Medicine,
Indianapolis, Indiana 46202
Smad7 is a regulatory Smad protein that is able
to antagonize signal transduction by transforming growth factor-
(TGF-
) and activin receptors. To characterize the regulation of
Smad7 at the transcriptional level, we isolated the promoter region of
the mouse Smad7 gene. When the Smad7 promoter luciferase
reporter gene (
408 and +112 bp) was expressed in human hepatoma
(HepG2) cells, its transcriptional activity was increased following
TGF-
or activin treatment. In addition, this region of the Smad7
promoter was stimulated by ectopic expression of Smad3 as well as
constitutively active TGF-
and activin receptors, indicating that
Smad7 transcription was modulated by the signaling downstream those two
receptors. A gel mobility shift assay indicated that a DNA fragment
spanning
408 to
126 base pairs (bp) was able to directly bind
purified Smad4. Furthermore, a consensus Smad3-Smad4 binding element
(SBE) was discovered in this region of the promoter with a palindromic sequence of GTCTAGAC. A 33-bp Smad7 promoter fragment containing this
SBE was able to bind Smad3 and Smad4. In human embryonic kidney 293 cells, the expression of constitutively active TGF-
type I receptor
was able to induce the formation of a Smad3- and Smad4-containing
nuclear protein complex that bound the SBE. In HepG2 cells, TGF-
1
treatment could induce the formation of an endogenous SBE-binding
complex. Taken together, these data provided the first evidence that
Smad7 transcription is regulated by TGF-
and activin signaling
through direct binding of Smad3 and Smad4 to the Smad7 promoter.
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