The Korean journal of internal medicine

The Korean Association of Internal Medicine (대한내과학회)
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The effects of nonyl phenoxypolyethoxyl ethanol on cell damage pathway gene expression in SK-N-SH cells

  • Park, Samel (Department of Internal Medicine, Soonchunhyang University College of Medicine) ;
  • Hwang, Il-woong (Pesticide Intoxication Institute, Soonchunhyang University College of Medicine) ;
  • Kim, Jin-sheon (Pesticide Intoxication Institute, Soonchunhyang University College of Medicine) ;
  • Kang, Hyo-chul (Department of Internal Medicine, Soonchunhyang University College of Medicine) ;
  • Park, Su-Yeon (Biostatistical Consulting Unit, Soonchunhyang University College of Medicine) ;
  • Gil, Hyo-wook (Department of Internal Medicine, Soonchunhyang University College of Medicine) ;
  • Song, Ho-yeon (Department of Microbiology, Soonchunhyang University College of Medicine) ;
  • Hong, Sae-yong (Department of Internal Medicine, Soonchunhyang University College of Medicine)
  • Received : 2014.06.23
  • Accepted : 2015.02.13
  • Published : 2015.11.01
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Abstract

Background/Aims: Most pesticide formulations contain both chief and additive ingredients. But, the additives may not have been tested as thoroughly as the chief ingredients. The surfactant, nonyl phenoxypolyethoxylethanol ($NP_{40}$), is an additive frequently present in pesticide formulations. We investigated the effects of $NP_{40}$ and other constituents of a validamycin pesticide formulation on cell viability and on the expression of genes involved in cell damage pathways. Methods: The effects of validamycin pesticide ingredients on cell viability and of $NP_{40}$ on the mRNA expression of 80 genes involved in nine key cellular pathways were examined in the human neuroblastoma SK-N-SH cell line. Results: The chemicals present in the validamycin pesticide formulation were cytotoxic to SK-N-SH cells and $NP_{40}$ showed the greatest cytotoxicity. A range of gene expression changes were identified, with both up- and down-regulation of genes within the same pathway. However, all genes tested in the necrosis signaling pathway were down-regulated and all genes tested in the cell cycle checkpoint/arrest pathway were up-regulated. The median fold-change in gene expression was significantly higher in the cell cycle checkpoint/arrest pathway than in the hypoxia pathway category (p = 0.0064). The 70 kDa heat shock protein 4 gene, within the heat shock protein/unfolded protein response category, showed the highest individual increase in expression (26.1-fold). Conclusions: $NP_{40}$ appeared to be particularly harmful, inducing gene expression changes that indicated genotoxicity, activation of the cell death (necrosis signaling) pathway, and induction of the 70 kDa heat shock protein 4 gene.

Keywords

Acknowledgement

Grant : A study for improvement of treatment modality in patients with acute pesticide additives intoxication

Supported by : Rural Development Administration

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