TGF-β/Smad Signaling Through DOCK4 Facilitates Lung Adenocarcinoma Metastasis

Overview

Journal Genes Dev

Specialty Molecular Biology

Date 2015 Feb 4

PMID 25644601

Citations 52

Authors

Jia-Ray Yu

Yilin Tai

Ying Jin

Molly C Hammell

J Erby Wilkinson

Jae-Seok Roe

Christopher R Vakoc

Linda Van Aelst

Affiliations

Soon will be listed here.

Abstract

The mechanisms by which TGF-β promotes lung adenocarcinoma (ADC) metastasis are largely unknown. Here, we report that in lung ADC cells, TGF-β potently induces expression of DOCK4, but not other DOCK family members, via the Smad pathway and that DOCK4 induction mediates TGF-β's prometastatic effects by enhancing tumor cell extravasation. TGF-β-induced DOCK4 stimulates lung ADC cell protrusion, motility, and invasion without affecting epithelial-to-mesenchymal transition. These processes, which are fundamental to tumor cell extravasation, are driven by DOCK4-mediated Rac1 activation, unveiling a novel link between TGF-β and Rac1. Thus, our findings uncover the atypical Rac1 activator DOCK4 as a key component of the TGF-β/Smad pathway that promotes lung ADC cell extravasation and metastasis.

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