c-Fos is required for TGFbeta1 production and the associated paracrine migratory effects of human colon carcinoma cells.

Abstract:

:In tumor cells that have lost responsiveness to the growth inhibitory effects of transforming growth factor beta (TGFbeta), increased TGFbeta production by the tumor cells often contributes to cancer progression, primarily through paracrine mechanisms. Here we investigated the major components of the activator protein-1 (AP-1) complex in the TGFbeta1 promoter of human colon carcinoma cells (HCCCs). In contrast to untransformed epithelial cells (UECs), HCCCs displayed constitutive activation of AP-1 at the proximal AP-1 site in the human TGFbeta1 promoter. Further, in contrast to the JunD and Fra-2 components present in the AP-1 complex at this AP-1 site in UECs, c-Fos was the major detectable AP-1 component in HCCCs. Thus, transcriptional factor switching had occurred in HCCCs relative to the UECs, with regard to the proximal AP-1 site of the human TGFbeta1 promoter. Small interfering RNAs (siRNAs) against c-Fos significantly suppressed AP-1 activity at the relevant AP-1 site, and led to a decrease in TGFbeta1 secretion by the HCCCs. Our results indicate for the first time that c-Fos binding at the TGFbeta1 promoter proximal AP-1 site in HCCCs is required for TGFbeta1 production by the tumor cells. Further, we demonstrated that blockade of TGFbeta1 secretion by c-Fos siRNA led to a suppression of the cellular migration and mitogenesis of NIH 3T3 fibroblasts in a paracrine fashion. Thus, c-Fos may have utility as a target for blocking tumor cell-secreted TGFbeta1, thereby suppressing the migratory behavior associated with the malignant phenotype of HCCCs.

journal_name

Mol Carcinog

journal_title

Molecular carcinogenesis

authors

Liu G,Ding W,Liu X,Mulder KM

doi

10.1002/mc.20189

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

582-93

issue

8

eissn

0899-1987

issn

1098-2744

journal_volume

45

pub_type

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