Oncotarget

Research Papers:

Silencing of WNK2 is associated with upregulation of MMP2 and JNK in gliomas

Angela Margarida Costa _, Filipe Pinto, Olga Martinho, Maria José Oliveira, Peter Jordan and Rui Manuel Reis

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Oncotarget. 2015; 6:1422-1434. https://doi.org/10.18632/oncotarget.2805

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Abstract

Angela Margarida Costa1,2, Filipe Pinto1,2, Olga Martinho1,2, Maria José Oliveira3, Peter Jordan4,5, Rui Manuel Reis1,2,6

1ICVS-Life and Health Sciences Research Institute, School of Health Sciences, University of Minho, Campus Gualtar, Braga 4710-057, Portugal

2ICVS/3B’s - PT -Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal

3INEB-Institute of Biomedical Engineering, Porto 4150-180, Portugal

4Department of Human Genetics, National Institute of Health Doutor Ricardo Jorge, Lisbon 1649-016, Portugal

5BioFig-Center of Biodiversity, Functional and Integrative Genomics, Lisbon 1649-016, Portugal

6Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP 14784-400, Brazil

Correspondence to:

Rui Manuel Reis, e-mail: rreis@ecsaude.uminho.pt

Keywords: WNK2, MMP2, JNK, gliomas, invasion

Received: July 16, 2014     Accepted: November 25, 2014     Published: December 22, 2014

ABSTRACT

Matrix metalloproteinases (MMPs) are proteolytic enzymes that degrade extracellular matrix (ECM), thus assisting invasion. Upregulation of MMPs, frequently reported in gliomas, is associated with aggressive behavior. WNK2 is a tumor suppressor gene expressed in normal brain, and silenced by promoter methylation in gliomas. Patients without WNK2 exhibited poor prognosis, and its downregulation was associated with increased glioma cell invasion.

Here we showed that MMP2 expression and activity are increased in glioma cell lines that do not express WNK2. Also, WNK2 inhibited JNK, a process associated with decreasing levels of MMP2. Thus, WNK2 promoter methylation and silencing in gliomas is associated with increased JNK activation and MMP2 expression and activity, thus explaining in part tumor cell invasion potential.


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