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Identification of Gene Expression Signature Modulated by Nicotinamide in a Mouse Bladder Cancer Model

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  • Seon-Kyu Kim
  • Seok-Joong Yun
  • Jiyeon Kim
  • Ok-Jun Lee
  • Suk-Chul Bae
  • Wun-Jae Kim

Abstract

Background: Urinary bladder cancer is often a result of exposure to chemical carcinogens such as cigarette smoking. Because of histological similarity, chemically-induced rodent cancer model was largely used for human bladder cancer studies. Previous investigations have suggested that nicotinamide, water-soluble vitamin B3, may play a key role in cancer prevention through its activities in cellular repair. However, to date, evidence towards identifying the genetic alterations of nicotinamide in cancer prevention has not been provided. Here, we search for the molecular signatures of cancer prevention by nicotinamide using a N-butyl-N-(4-hydroxybutyl)-nitrosamine (BBN)-induced urinary bladder cancer model in mice. Methodology/Principal Findings: Via microarray gene expression profiling of 20 mice and 233 human bladder samples, we performed various statistical analyses and immunohistochemical staining for validation. The expression patterns of 893 genes associated with nicotinamide activity in cancer prevention were identified by microarray data analysis. Gene network analyses of these 893 genes revealed that the Myc and its associated genes may be the most important regulator of bladder cancer prevention, and the gene expression signature correlated well with protein expression data. Comparison of gene expression between human and mouse revealed that BBN-induced mouse bladder cancers exhibited gene expression profiles that were more similar to those of invasive human bladder cancers than to those of non-invasive human bladder cancers. Conclusions/Significance: This study demonstrates that nicotinamide plays an important role as a chemo-preventive and therapeutic agent in bladder cancer through the regulation of the Myc oncogenic signature. Nicotinamide may represent a promising therapeutic modality in patients with muscle-invasive bladder cancer.

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  • Seon-Kyu Kim & Seok-Joong Yun & Jiyeon Kim & Ok-Jun Lee & Suk-Chul Bae & Wun-Jae Kim, 2011. "Identification of Gene Expression Signature Modulated by Nicotinamide in a Mouse Bladder Cancer Model," PLOS ONE, Public Library of Science, vol. 6(10), pages 1-11, October.
    • Handle: RePEc:plo:pone00:0026131
    DOI: 10.1371/journal.pone.0026131
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    1. Dudoit S. & Fridlyand J. & Speed T. P, 2002. "Comparison of Discrimination Methods for the Classification of Tumors Using Gene Expression Data," Journal of the American Statistical Association, American Statistical Association, vol. 97, pages 77-87, March.
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