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J. Biol. Chem., Vol. 277, Issue 43, 41220-41229, October 25, 2002
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1 through c-Jun in a Smad-independent
Manner*
,
,
,
,
¶
From The human NOV secreted glycoprotein (NOVH) is
abundant in the fetal and adult adrenal cortex. The amount of NOVH
increases in benign adrenocortical tumors and decreases in malignant
adrenocortical tumors, suggesting that NOVH plays a role in
tumorigenesis in the adrenal cortex. Transforming growth factor
INSERM U515 and § INSERM U482,
Hôpital Saint-Antoine, 75571 Paris Cedex 12, France
1
(TGF
1), fibroblast growth factor 2 (FGF2), and insulin growth
factors (IGFs) play crucial roles in the physiology of the adrenal
cortex. We investigated the effects of these factors on the expression
of novH in the NCI H295R adrenocortical cell line. The
amounts of NOVH protein and novH transcripts were
down-regulated by TGF
1 and up-regulated by FGF2, whereas IGFs had no
effect. Furthermore, the TGF
1-dependent inhibition of
novH promoter activity was completely abrogated following
site-directed mutation of two activating protein (AP-1) sequences
(positions
473 and
447), whereas the stimulatory effect of FGF2 was
not affected. Co-transfection with dominant negative forms of c-Jun and
MEKK1 also abrogated novH-targeted regulation by TGF
1,
whereas the overproduction of Smad proteins or dominant negative forms
of Smad had no effect. Taken together, these results suggest that c-Jun
and MEKK1 signaling but not Smad signaling are involved in the
TGF
1-dependent decrease in NOVH in NCI H295R cells. In
conclusion, our data provide evidence that novH is a new
target of TGF
1; unlike other members of the CCN
(cyr61, ctgf,
nov) family, however, its
expression is repressed rather than induced.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AJ431713.
¶ To whom correspondence should be addressed: INSERM U515, Hôpital Saint-Antoine, 184 rue du Faubourg Saint-Antoine, 75571 Paris Cedex 12, France. Tel.: 33-1-4928-4664 or 4631; Fax: 33-1-4343-1065; Email: martiner@st-antoine.inserm.fr.This article has been cited by other articles:
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