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J. Biol. Chem., Vol. 275, Issue 40, 30765-30773, October 6, 2000
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From the Department of Pharmacology, Pennsylvania State University
College of Medicine, Hershey, Pennsylvania 17033
Our previous results have shown that transforming
growth factor
Requirement of Ras/MAPK Pathway Activation by Transforming Growth
Factor
for Transforming Growth Factor
1
Production in a Smad-dependent Pathway*
(TGF
) rapidly activates Ras, as well as both
ERKs and SAPKs. In order to address the biological significance
of the activation of these pathways by TGF
, here we examined the
role of the Ras/MAPK pathways and the Smads in
TGF
3 induction of TGF
1 expression in untransformed lung and intestinal epithelial cells. Expression of
either a dominant-negative mutant of Ras (RasN17) or a
dominant-negative mutant of MKK4 (DN MKK4), or addition of the MEK1
inhibitor PD98059, inhibited the ability of TGF
3 to
induce AP-1 complex formation at the TGF
1 promoter, and
the subsequent induction of TGF
1 mRNA. The primary
components present in this TGF
3-inducible AP-1 complex at the TGF
1 promoter were JunD and Fra-2, although c-Jun
and FosB were also involved. Furthermore, deletion of the AP-1 site in
the TGF
1 promoter or addition of PD98059 inhibited the
ability of TGF
3 to stimulate TGF
1
promoter activity. Collectively, our data demonstrate that
TGF
3 induction of TGF
1 is mediated
through a signaling cascade consisting of Ras, the MAPKKs
MKK4 and MEK1, the MAPKs SAPKs and ERKs, and the specific AP-1 proteins
Fra-2 and JunD. Although Smad3 and Smad4 were not detectable in
TGF
3-inducible AP-1 complexes at the TGF
1
promoter, stable expression of dominant-negative Smad3 could
significantly inhibit the ability of TGF
3 to stimulate TGF
1 promoter activity. Transient expression of
dominant-negative Smad4 also inhibited the ability of
TGF
3 to transactivate the TGF
1 promoter.
Thus, although the Ras/MAPK pathways are essential for
TGF
3 induction of TGF
1, Smads may only
contribute to this biological response in an indirect manner.
*
This work was supported by National Institutes of Health
Grants CA51424, CA54816, and CA68444 (to K. M. M.).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 Pharmacology
H078, Pennsylvania State University College of Medicine, 500 University
Dr., Hershey, PA 17033. Tel.: 717-531-6789; Fax: 717-531-5013; E-mail:
kmm15@psu.edu.
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