Smad3 regulates E-cadherin via miRNA-200 pathway.

Abstract:

:To identify potential microRNA (miRNA) links between Smad3, a mediator of TGF-β (transforming growth factor-β) signaling, and E-cadherin, we characterized the miRNA profiles of two gastric cancer cell lines: SNU484-LPCX, which does not express Smad3, and SNU484-Smad3, in which Smad3 is overexpressed. We found that among differentially expressed miRNAs, miR-200 family members are overexpressed in SNU484-Smad3 cells. Subsequent studies, including analysis of the effects of silencing Smad3 in SNU484-Smad3 cells and a luciferase reporter assay, revealed that Smad3 directly binds to a Smad-binding element located in the promoter region of miR-200b/a, where it functions as a transcriptional activator. TGF-β did not affect the regulatory role of Smad3 in transcription of miR-200 and expression of epithelial-mesenchymal transition markers. We conclude that Smad3 regulates, at the transcriptional level, miR-200 family members, which themselves regulate ZEB1 and ZEB2, known transcriptional repressors of E-cadherin, at the posttranscriptional level in a TGF-β-independent manner. This represents a novel link between Smad3 and posttranscriptional regulation by miRNAs in epithelial-mesenchymal transition in gastric cancer cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Ahn SM,Cha JY,Kim J,Kim D,Trang HT,Kim YM,Cho YH,Park D,Hong S

doi

10.1038/onc.2011.484

subject

Has Abstract

pub_date

2012-06-21 00:00:00

pages

3051-9

issue

25

eissn

0950-9232

issn

1476-5594

pii

onc2011484

journal_volume

31

pub_type

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