Abstract
Endometrial cancer is the most frequent malignancy of the female genital tract in western countries. Our group has previously characterized the upregulation of the transcription factor ETV5 in endometrial cancer with a specific and significant increase in those tumor stages associated with myometrial invasion. We have shown that ETV5 overexpression in Hec1A endometrial cancer cells induces epithelial to mesenchymal transition resulting in the acquisition of migratory and invasive capabilities. In the present work, we have identified Nidogen 1 (NID1) and Nuclear Protein 1 (NUPR1) as direct transcriptional targets of ETV5 in endometrial cancer cells. Inhibition of NID1 and NUPR1 in ETV5 overexpressing cells reduced cell migration and invasion in vitro and reduced tumor growth and dissemination in an orthotopic endometrial cancer model. Importantly, we confirmed a significant increase of NUPR1 and NID1 protein expression in the invasion front of the tumor compared to their paired superficial zone, concomitant to ETV5 overexpression. Altogether, we conclude that NID1 and NUPR1 are novel targets of ETV5 and are actively cooperating with ETV5 at the invasion front of the tumor in the acquisition of an invasive phenotype to jointly drive endometrial cancer invasion.
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Abbreviations
- EMT:
-
Epithelial to Mesenchymal Transition
- NID1:
-
Nidogen 1
- NUPR1:
-
Nuclear Protein 1
- H:
-
Hec1A cells
- HG:
-
Hec1A cells transfected with the pEGFP-C2 vector alone
- HGE:
-
Hec1A cells transfected with the pEGFP-hETV5
- HGEshNID1:
-
HGE with downregulation of NID1
- HGEshNUPR1:
-
HE with downregulation of NUPR1
- HGEshC:
-
HE with shControl
- ChIP:
-
Chromatin immunoprecipitation
- RTqPCR:
-
Real time quantitative PCR
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Acknowledgments
We thank Marie-Noé Lavaut for technical assistance. This work has been supported by the Spanish Ministry of Science and Innovation (SAF2011-26548), the Spanish Ministry of Health (RD12/0036/0035), the AECC (Grupos Estables de Investigacion 2011—AECC- GCB 110333 REVE), the Fundació La Marató TV3 (2/C/2013), the CIRIT Generalitat de Catalunya (2014 SGR 1330) and the European Commission EU FP7-PEOPLE-2010-IRSES (PROTBIOFLUID-269285). La Ligue Contre le Cancer, INCa, Canceropole PACA, DGOS (labellisation SIRIC) and INSERM to JLI. EM is recipient of a fellowship from the Ministry of Education, Culture and Sport (Spain) (FPU12/05571).
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Jaume Reventós and Anna Ruiz have contributed equally to this work.
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Pedrola, N., Devis, L., Llauradó, M. et al. Nidogen 1 and Nuclear Protein 1: novel targets of ETV5 transcription factor involved in endometrial cancer invasion. Clin Exp Metastasis 32, 467–478 (2015). https://doi.org/10.1007/s10585-015-9720-7
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DOI: https://doi.org/10.1007/s10585-015-9720-7