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Systems Toxicology Approach to Unravel Early Indicators of Squamous Cell Carcinoma Rate in Rat Nasal Epithelium Induced by Formaldehyde Exposure

  • Florian MartinEmail author
  • Marja Talikka
  • Julia Hoeng
  • Manuel C. Peitsch
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 1005)

Abstract

Causal biological network models consisting of multiple biological pathways involved in a given biological process can serve to contextualize gene expression changes and unravel key mechanisms responsible for those changes. The transcriptomic data from the respiratory nasal epithelium (RNE) of rats exposed to formaldehyde have been investigated using such causal biological network models. The resulting association between the biological impact assessed by network perturbation and the squamous cell carcinoma rate in the RNE after two years has been further investigated to gain mechanistic insights. A detailed node-level investigation revealed that while similar network models were impacted across exposure doses, the directionality of the effect was opposite for the lowest doses compared to high doses. In particular, NF-κB was inferred to be upregulated in response to the two higher doses and downregulated in response to the lower doses in the context of the epithelial innate immune activation network model. This highlighted a dose threshold indicative of a long-term biphasic effect of formaldehyde exposure leading to carcinogenicity. The presented approach could be used to establish the mechanism of action or grouping of compounds based on impacted regions in the network models.

Keywords

Gene expression Network biology Toxicology 

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Florian Martin
    • 1
    Email author
  • Marja Talikka
    • 1
  • Julia Hoeng
    • 1
  • Manuel C. Peitsch
    • 1
  1. 1.PMI R&D, Philip Morris Products S.A.NeuchâtelSwitzerland

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