Abstract
Pancreatic ductal adenocarcinoma (PDAC) is usually incurable. Contrary to genetic mechanisms involved in PDAC pathogenesis, epigenetic alterations are ill defined. Here, we determine the contribution of epigenetically silenced genes to the development of PDAC. We analyzed enriched, highly methylated DNAs from PDACs, chronic pancreatitis (CP) and normal tissues using CpG island microarrays and identified WNK2 as a prominent candidate tumor suppressor gene being downregulated early in PDAC development. WNK2 was further investigated in tissue microarrays, methylation analysis of early pancreatic intraepithelial neoplasia (PanIN), mouse models for PDAC and pancreatitis, re-expression studies after demethylation, and cell growth assays using WNK2 overexpression. Demethylation assays confirmed the link between methylation and expression. WNK2 hypermethylation was higher in tumor than in surrounding inflamed tissues and was observed in PanIN lesions as well as in a PDAC mouse model. WNK2 mRNA and protein expressions were lower in PDAC and CP compared with normal tissues both in patients and mouse models. Overexpression of WNK2 led to reduced cell growth, and WNK2 expression in tissues correlated negatively with pERK1/2 expression, a downstream target of WNK2 responsible for cell proliferation. Downregulation of WNK2 by promoter hypermethylation occurs early in PDAC pathogenesis and may support tumor cell growth via the ERKāMAPK pathway.
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Acknowledgements
We would like to thank Reinhard Gliniorz, Oliver MĆ¼cke, Jana Petersen, Peter Waas and Otto Zelezny for their technical support, Dr Marta Faryna and Dr Carolin Konermann for discussions regarding the MCIp/microarray assays, Anna Poetsch and Christopher Schmidt for experimental advices, Dr Rainer Claus and Dr Christopher Oakes for stimulating discussions and Dr Ming-Sound Tsao (Ontario Cancer Institute, Toronto, Canada) for providing us the HPDE6-E6E7 cell line. This work is supported by grants from the Cancer Institute New South Wales, Australia (10FRL203 fellowship), from the German Federal Ministry of Education and Research (PKB-01GS08114) and from the German Federal Ministry of Education and Research as part of the PaCaNet consortium within the NGFN program. We thank the Fulbright commission in Germany and the US State Department for providing external funding (TK).
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Dutruel, C., Bergmann, F., Rooman, I. et al. Early epigenetic downregulation of WNK2 kinase during pancreatic ductal adenocarcinoma development. Oncogene 33, 3401ā3410 (2014). https://doi.org/10.1038/onc.2013.312
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DOI: https://doi.org/10.1038/onc.2013.312
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