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Title: Epigenetic inactivation of the premature aging Werner syndrome gene in human cancer
Author: Agrelo, Ruben
Cheng, Wen-Hsing
Setién, Fernando
Ropero, Santiago
Espada, Jesús
Fraga, Mario F.
Herranz Carnero, Michel
Paz, Maria F.
Sánchez Céspedes, Montserrat
Artiga, Maria Jesus
Guerrero-Setas, David
Castells Garangou, Antoni
Von Kobbe, Cayetano
Bohr, Vilhelm A.
Esteller, Manel
Keywords: Envelliment
Càncer colorectal
Colorectal cancer
Issue Date: 6-Jun-2006
Publisher: National Academy of Sciences
Abstract: Werner syndrome (WS) is an inherited disorder characterized by premature onset of aging, genomic instability, and increased cancer incidence. The disease is caused by loss of function mutations of the WRN gene, a RecQ family member with both helicase and exonuclease activities. However, despite its putative tumor-suppressor function, little is known about the contribution of WRN to human sporadic malignancies. Here, we report that WRN function is abrogated in human cancer cells by transcriptional silencing associated with CpG island-promoter hypermethylation. We also show that, at the biochemical and cellular levels, the epigenetic inactivation of WRN leads to the loss of WRN-associated exonuclease activity and increased chromosomal instability and apoptosis induced by topoisomerase inhibitors. The described phenotype is reversed by the use of a DNA-demethylating agent or by the reintroduction of WRN into cancer cells displaying methylation-dependent silencing of WRN. Furthermore, the restoration of WRN expression induces tumor-suppressor-like features, such as reduced colony formation density and inhibition of tumor growth in nude mouse xenograft models. Screening a large collection of human primary tumors (n = 630) from different cell types revealed that WRN CpG island hypermethylation was a common event in epithelial and mesenchymal tumorigenesis. Most importantly, WRN hypermethylation in colorectal tumors was a predictor of good clinical response to the camptothecin analogue irinotecan, a topoisomerase inhibitor commonly used in the clinical setting for the treatment of this tumor type. These findings highlight the importance of WRN epigenetic inactivation in human cancer, leading to enhanced chromosomal instability and hypersensitivity to chemotherapeutic drugs.
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It is part of: Proceedings of the National Academy of Sciences of the United States of America - PNAS, 2006, vol. 103, num. 23, p. 8822-8827
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ISSN: 0027-8424
Appears in Collections:Articles publicats en revistes (Ciències Fisiològiques)
Articles publicats en revistes (IDIBAPS: Institut d'investigacions Biomèdiques August Pi i Sunyer)

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