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  • The microRNA 424/503 cluster reduces CDC25A expression during cell cycle arrest imposed by transforming growth factor β in mammary epithelial cells.

The microRNA 424/503 cluster reduces CDC25A expression during cell cycle arrest imposed by transforming growth factor β in mammary epithelial cells.

Molecular and cellular biology (2014-10-01)
David Llobet-Navas, Ruth Rodriguez-Barrueco, Janis de la Iglesia-Vicente, Mireia Olivan, Veronica Castro, Laura Saucedo-Cuevas, Netonia Marshall, Preeti Putcha, Mireia Castillo-Martin, Evan Bardot, Elena Ezhkova, Antonio Iavarone, Carlos Cordon-Cardo, Jose M Silva
ABSTRACT

Recently, we demonstrated that the microRNA 424(322)/503 [miR-424(322)/503] cluster is transcriptionally controlled by transforming growth factor β (TGF-β) in the mammary epithelium. Induction of this microRNA cluster impacts mammary epithelium fate by regulating apoptosis and insulin-like growth factor 1 (IGF1) signaling. Here, we expanded our finding to demonstrate that miR-424(322)/503 is an integral component of the cell cycle arrest mediated by TGF-β. Mechanistically, we showed that after TGF-β exposure, increased levels of miR-424(322)/503 reduce the expression of the cell cycle regulator CDC25A. miR-424(322)/503-dependent posttranscriptional downregulation of CDC25A cooperates with previously described transcriptional repression of the CDC25A promoter and proteasome-mediated degradation to reduce the levels of CDC25A expression and to induce cell cycle arrest. We also provide evidence that the TGF-β/miR-424(322)/503 axis is part of the mechanism that regulates the proliferation of hormone receptor-positive (HR(+)) mammary epithelial cells in vivo.

MATERIALS
Product Number
Brand
Product Description

Roche
Protein A Agarose, >98% (HPLC and SDS-PAGE), suspension
Roche
FastStart Taq DNA Polymerase, dNTPack
Roche
Lumi-Light Western Blotting Substrate