Epigenetic mediated transcriptional activation of WNT5A participates in arsenical-associated malignant transformation

• Published in: Toxicology and applied pharmacology 2009-02, Vol.235 (1), p.39-46
• Main Authors: Jensen, Taylor J., Wozniak, Ryan J., Eblin, Kylee E., Wnek, Sean M., Gandolfi, A. Jay, Futscher, Bernard W.
• Format: Article
• Language: English
• Subjects: 60 APPLIED LIFE SCIENCES; ACETYLATION; ARSENIC; Arsenicals - pharmacology; Biological and medical sciences; BLADDER; Carcinogenesis, carcinogens and anticarcinogens; CARCINOGENS; Carcinogens - pharmacology; Cell Line; Cell Transformation, Neoplastic - drug effects; Cell Transformation, Neoplastic - genetics; Chemical agents; Chemical and industrial products toxicology. Toxic occupational diseases; DRUGS; ENRICHMENT; Epigenesis, Genetic - drug effects; Epigenetic; GENE REGULATION; Gene Silencing; GENES; Histone modification; Histones; Humans; LUNGS; Medical sciences; Metals and various inorganic compounds; Mutation; NEOPLASMS; Promoter Regions, Genetic - genetics; PROMOTERS; Proto-Oncogene Proteins - chemistry; Proto-Oncogene Proteins - genetics; Proto-Oncogene Proteins - metabolism; SKIN; Toxicology; Transcription, Genetic - drug effects; Tumors; UROtsa; Wnt Proteins - chemistry; Wnt Proteins - genetics; Wnt Proteins - metabolism; Wnt-5a Protein; WNT5A
• ISSN: 0041-008X; 1096-0333
• DOI: 10.1016/j.taap.2008.10.013

Arsenic is a human carcinogen with exposure associated with cancer of the lung, skin, and bladder. Many potential mechanisms have been implicated as playing a role in the process of arsenical-induced malignancy including the perturbation of signaling pathways and aberrant epigenetic regulation. We initiated studies to examine the role of a member of the non-canonical WNT signaling pathway, WNT5A, in UROtsa cells and arsenite [URO-ASSC] and monomethylarsonous acid [URO-MSC] malignantly transformed variants. We present data herein that suggest that WNT5A is transcriptionally activated during arsenical-induced malignant transformation. This WNT5A transcriptional activation is correlated with the enrichment of permissive histone modifications and the reduction of repressive modifications in the WNT5A promoter region. The epigenetic activation of WNT5A expression and acetylation of its promoter remain after the removal of the arsenical, consistent with the maintenance of an anchorage independent growth phenotype in these cells. Additionally, treatment with epigenetic modifying drugs supports a functional role for these epigenetic marks in controlling gene expression. Reduction of WNT5A using lentiviral shRNA greatly attenuated the ability of these cells to grow in an anchorage independent fashion. Extension of our model into human bladder cancer cell lines indicates that each of the cell lines examined also express WNT5A. Taken together, these data suggest that the epigenetic remodeling of the WNT5A promoter is correlated with its transcriptional activation and this upregulation likely participates in arsenical-induced malignant transformation.