Role of the integrin-linked kinase (ILK)/Rictor complex in TGFβ-1-induced epithelial-mesenchymal transition (EMT).

Abstract:

:Epithelial-to-mesenchymal transition (EMT) causes fibrosis, cancer progression and metastasis. Integrin-linked kinase (ILK) is a focal adhesion adaptor and a serine/threonine protein kinase that regulates cell proliferation, survival and EMT. Elucidating the molecular mechanisms necessary for development and progression of human malignancies is critical to predict the most appropriate targets for cancer therapy. Here, we used transforming growth factor beta-1 (TGFβ-1) to promote EMT and migration in mammary epithelial cells. We demonstrate a requirement of ILK activity for TGFβ-1-mediated EMT in mammary epithelial cells. In addition to nuclear translocation of Snail and Slug, TGFβ-1 treatment also induced expression of the mammalian target of rapamycin complex 2 component Rictor and its phosphorylation on Thr1135. Interestingly, TGFβ-1 treatment also induced an interaction between ILK and Rictor. All of these TGFβ-1-induced processes were significantly suppressed by inhibiting ILK activity or by disrupting the ILK/Rictor complex using small-interfering RNA-mediated knockdown. Furthermore, we identified ILK/Rictor complex formation in cancer but not in normal cell types, and this was accompanied by ILK-dependent phosphorylation of Rictor on residue Thr1135. Inhibition of ILK partially reversed the basal mesenchymal phenotype of MDA-MB-231 cells and prevented EMT in MCF10A cells after TGFβ-1 treatment. These data demonstrate a requirement for ILK function in TGFβ-1-induced EMT in mammary epithelial cells and identify the ILK/Rictor complex as a potential molecular target for preventing/reversing EMT.

journal_name

Oncogene

journal_title

Oncogene

authors

Serrano I,McDonald PC,Lock FE,Dedhar S

doi

10.1038/onc.2012.30

subject

Has Abstract

pub_date

2013-01-03 00:00:00

pages

50-60

issue

1

eissn

0950-9232

issn

1476-5594

pii

onc201230

journal_volume

32

pub_type

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