Oncotarget

Research Papers:

RMEL3, a novel BRAFV600E-associated long noncoding RNA, is required for MAPK and PI3K signaling in melanoma

Lucas Goedert _, Cristiano G. Pereira, Jason Roszik, Jessica R. Plaça, Cibele Cardoso, Guo Chen, Wanleng Deng, Vashisht Gopal Yennu-Nanda, Wilson A. Silva Jr., Michael A. Davies and Enilza M. Espreafico

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Oncotarget. 2016; 7:36711-36718. https://doi.org/10.18632/oncotarget.9164

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Abstract

Lucas Goedert1,2,*, Cristiano G. Pereira1,*, Jason Roszik3,*, Jessica R. Plaça2,4, Cibele Cardoso1, Guo Chen3, Wanleng Deng3, Vashisht Gopal Yennu-Nanda3, Wilson A. Silva Jr.2,5, Michael A. Davies4, Enilza M. Espreafico1

1Department of Cell and Molecular Biology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil

2National Institute of Science and Technology in Stem Cell and Cell Therapy and Center for Cell-Based Therapy, Ribeirão Preto, São Paulo, Brazil

3Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America

4Clinical Oncology, Stem Cell and Cell Therapy Program, Ribeirão Preto Medical School, Ribeirão Preto, São Paulo, Brazil

5Department of Genetics, Ribeirão Preto Medical School, and Center for Integrative System Biology (CISBi-NAP/USP), University of São Paulo, Ribeirão Preto, São Paulo, Brazil

*These authors have contributed equally to this work

Correspondence to:

Enilza M. Espreafico, e-mail: emesprea@fmrp.usp.br

Keywords: lncRNA, ncRNA, TCGA, ENSG00000250961, ENST00000506106.1

Received: August 28, 2015    Accepted: April 16, 2016    Published: May 4, 2016

ABSTRACT

Previous work identified RMEL3 as a lncRNA with enriched expression in melanoma. Analysis of The Cancer Genome Atlas (TCGA) data confirmed RMEL3 enriched expression in melanoma and demonstrated its association with the presence of BRAFV600E. RMEL3 siRNA-mediated silencing markedly reduced (95%) colony formation in different BRAFV600E melanoma cell lines. Multiple genes of the MAPK and PI3K pathways found to be correlated with RMEL3 in TCGA samples were experimentally confirmed. RMEL3 knockdown led to downregulation of activators or effectors of these pathways, including FGF2, FGF3, DUSP6, ITGB3 and GNG2. RMEL3 knockdown induces gain of protein levels of tumor suppressor PTEN and the G1/S cyclin-Cdk inhibitors p21 and p27, as well as a decrease of pAKT (T308), BRAF, pRB (S807, S811) and cyclin B1. Consistently, knockdown resulted in an accumulation of cells in G1 phase and subG0/G1 in an asynchronously growing population. Thus, TCGA data and functional experiments demonstrate that RMEL3 is required for MAPK and PI3K signaling, and its knockdown decrease BRAFV600E melanoma cell survival and proliferation.


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