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Open Access 01-12-2016 | Research

The D Domain of LRRC4 anchors ERK1/2 in the cytoplasm and competitively inhibits MEK/ERK activation in glioma cells

Authors: Zeyou Wang, Qin Guo, Rong Wang, Gang Xu, Peiyao Li, Yingnan Sun, Xiaoling She, Qiang Liu, Qiong Chen, Zhibin Yu, Changhong Liu, Jing Xiong, Guiyuan Li, Minghua Wu

Published in: Journal of Hematology & Oncology | Issue 1/2016

Abstract

Background

As a well-characterized key player in various signal transduction networks, extracellular-signal-regulated kinase (ERK1/2) has been widely implicated in the development of many malignancies. We previously found that Leucine-rich repeat containing 4 (LRRC4) was a tumor suppressor and a negative regulator of the ERK/MAPK pathway in glioma tumorigenesis. However, the precise molecular role of LRRC4 in ERK signal transmission is unclear.

Methods

The interaction between LRRC4 and ERK1/2 was assessed by co-immunoprecipitation and GST pull-down assays in vivo and in vitro. We also investigated the interaction of LRRC4 and ERK1/2 and the role of the D domain in ERK activation in glioma cells.

Results

Here, we showed that LRRC4 and ERK1/2 interact via the D domain and CD domain, respectively. Following EGF stimuli, the D domain of LRRC4 anchors ERK1/2 in the cytoplasm and abrogates ERK1/2 activation and nuclear translocation. In glioblastoma cells, ectopic LRRC4 expression competitively inhibited the interaction of endogenous mitogen-activated protein kinase (MEK) and ERK1/2. Mutation of the D domain decreased the LRRC4-mediated inhibition of MAPK signaling and its anti-proliferation and anti-invasion roles.

Conclusions

Our results demonstrated that the D domain of LRRC4 anchors ERK1/2 in the cytoplasm and competitively inhibits MEK/ERK activation in glioma cells. These findings identify a new mechanism underlying glioblastoma progression and suggest a novel therapeutic strategy by restoring the activity of LRRC4 to decrease MAPK cascade activation.

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Title: The D Domain of LRRC4 anchors ERK1/2 in the cytoplasm and competitively inhibits MEK/ERK activation in glioma cells
Authors: Zeyou Wang
Qin Guo
Rong Wang
Gang Xu
Peiyao Li
Yingnan Sun
Xiaoling She
Qiang Liu
Qiong Chen
Zhibin Yu
Changhong Liu
Jing Xiong
Guiyuan Li
Minghua Wu
Publication date: 01-12-2016
Publisher: BioMed Central
Published in: Journal of Hematology & Oncology / Issue 1/2016
Electronic ISSN: 1756-8722
DOI: https://doi.org/10.1186/s13045-016-0355-1

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Abstract

Background

Methods

Results

Conclusions

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