API

Aop: 11

AOP Title

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Percellome Toxicogenomics Approach for AOP Building: Case study on Pentachlorophenol

Short name:

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Pentachlorophenol Acute Response by Percellome

Authors

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Jun Kanno Division of Cellular & Molecular Toxicology, Biological Safety Research Center, National Institute of Health Sciences

1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan +81-3-3700-9619 kanno@nihs.go.jp

Point of Contact

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Jun Kanno

Contributors

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  • Jun Kanno

Status

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Author status OECD status OECD project SAAOP status
Under development: Not open for comment. Do not cite Under Development 2.5 Included in OECD Work Plan


This AOP was last modified on December 03, 2016 16:37

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Revision dates for related pages

Page Revision Date/Time
Activation, PXR/SXR September 16, 2017 10:14

Abstract

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This case study aims at making AOPs triggered by oral exposure to Pentachlorophenol (PCP) of liver and possible new aspect of systemic toxicity. In this case study, Pentachlorophenol (PCP) was monitored for adult mouse liver transcriptome responses 2, 4, 8 and 24 hours after single oral administration with four dose levels, 0, 10, 30 and 100mg/kg, using Affymetrix GeneChip MOE430 2.0. The expression data were absolutized by the Percellome method and expressed as three dimensional (3D) surface graphs with axises of time, dose and copy numbers of mRNA per cell. Homemade software RSort was used for comprehensive screening of the 3D surface data followed by visual inspection to confirm the significant responses, and PercellomeExploror for cross-referencing. In the first 8 hours, approximately 100 probe sets (PSs) related to PXR/SXR and Cyp2a4 and other metabolic enzymes were induced, and Fos and Junb were suppressed. At 24 hours, about 1,200 PSs were strongly induced. Cross-referencing the Percellome database consisting of 111 chemicals on liver transcriptome revealed that about half of the PSs belonged to the metabolic pathways including Nrf2-mediated oxidative stress response networks, sharing with some of the 111 chemicals. The other half was interferon signalling network genes (ISG), and was unique to PCP. Toll like receptors and other pattern recognition receptors, interferon regulatory factors and interferon alpha itself were included. On the other hand, inflammatory cytokines were not induced. In summary, functional symptoms of PCP, such as hyperthermia and profuse sweating might be mediated by the ISG rather than the hitherto documented mitochondrial uncoupling mechanism. Reports of imiquimod and RO8191 as agonists of toll-like receptor and interferon receptor might associate PCP with a seed for interferon mimetic drugs (cf. Figure below).

This case study will also serve as an example of how the Percellome Project Database and Percellome Analytical Tools can be effectively applied to the AOP development. Further studies including in silico data mining will expand the AOP to cover the chronic liver toxicity induced by PCP.


Background (optional)

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Summary of the AOP

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Stressors

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Molecular Initiating Event

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Title Short name
Activation, PXR/SXR Activation, PXR/SXR

Key Events

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Adverse Outcome

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Relationships Between Two Key Events (Including MIEs and AOs)

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Network View

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Life Stage Applicability

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Taxonomic Applicability

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Sex Applicability

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Graphical Representation

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Click to download graphical representation template

Overall Assessment of the AOP

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Domain of Applicability

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Essentiality of the Key Events

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Weight of Evidence Summary

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Quantitative Considerations

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Considerations for Potential Applications of the AOP (optional)

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References

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