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J. Biol. Chem., Vol. 275, Issue 43, 33205-33208, October 27, 2000
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-induced Transcription of the
Smad7 Gene*
§,
,
,

From the Activation of transforming growth factor-
Whitehead Institute for Biomedical Research,
Cambridge, Massachusetts 02142 and Department of Biology, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139 and
¶ Samuel Lunenfeld Research Institute, Mount Sinai Hospital,
Toronto, Ontario M5G 1X5, Canada
(TGF-
) receptors triggers phosphorylation of Smad2 and Smad3. After
binding to Smad4, the complex enters the nucleus and interacts with
other transcription factors to activate gene transcription. Unlike
other Smads, Smad7 inhibits phosphorylation of Smad2 and Smad3, and its
transcription is induced by TGF-
, suggesting a negative feedback loop. Here, we show that TFE3 and Smad3 synergistically mediate TGF-
-induced transcription from the Smad7 promoter by binding to an
E-box and two adjacent Smad binding elements (SBEs), respectively. A
precise 3-base pair spacer between one SBE and the E-box is essential.
Previously, we showed that a similar arrangement between a SBE and an
E-box of an element is essential for TGF-
-dependent transcription of the plasminogen activator inhibitor-1 gene
(PAI-1) and that TGF-
-induced phosphorylation of
Smad3 triggers its association with TFE3. Thus, TFE3-Smad3 response
elements may represent a common target for TGF-
-induced gene expression.
Recipient of National Science and Engineering Council
and "Fonds pour la formation de chercheurs et l'aide à la
recherche" studentship.
**
A Canadian Institute of Health Research investigator.

To whom correspondence should be addressed: The Whitehead
Institute, Nine Cambridge Center, Cambridge, MA 02142. Tel.:
617-258-5216; Fax: 617-258-6768; E-mail: lodish@wi.mit.edu.
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