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HERO ID
3981309
Reference Type
Journal Article
Title
Use of high-throughput in vitro toxicity screening data in cancer hazard evaluations by IARC Monograph Working Groups
Author(s)
Chiu, WA; Guyton, KZ; Martin, MT; Reif, DM; Rusyn, I
Year
2018
Is Peer Reviewed?
Yes
Journal
ALTEX
ISSN:
1868-596X
EISSN:
1868-8551
Volume
35
Issue
1
Page Numbers
51-64
Language
English
PMID
28738424
DOI
10.14573/altex.1703231
Web of Science Id
WOS:000431498900005
Abstract
Evidence regarding carcinogenic mechanisms serves a critical role in International Agency for Research on Cancer (IARC) Monograph evaluations. Three recent IARC Working Groups pioneered inclusion of the US Environmental Protection Agency (EPA) ToxCast program high-throughput screening (HTS) data to supplement other mechanistic evidence. In Monograph V110, HTS profiles were compared between perfluorooctanoic acid (PFOA) and prototypical activators across multiple nuclear receptors. For Monograph V112 -113, HTS assays were mapped to 10 key characteristics of carcinogens identified by an IARC expert group, and systematically considered as an additional mechanistic data stream. Both individual assay results and ToxPi-based rankings informed mechanistic evaluations. Activation of multiple nuclear receptors in HTS assays showed that PFOA targets peroxisome proliferator activated and other receptors. ToxCast assays substantially covered 5 of 10 key characteristics, corroborating literature evidence of "induces oxidative stress" and "alters cell proliferation, cell death or nutrient supply" and filling gaps for "modulates receptor-mediated effects." Thus, ToxCast HTS data were useful both in evaluating specific mechanistic hypotheses and in the overall evaluation of mechanistic evidence. However, additional HTS assays are needed to provide more comprehensive coverage of the 10 key characteristics of carcinogens that form the basis of current IARC mechanistic evaluations.
Keywords
carcinogenicity; high throughput screening; in vitro; mechanisms
Tags
PFAS
•
Additional PFAS (formerly XAgency)
•
^Per- and Polyfluoroalkyl Substances (PFAS)
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
•
PFAS 150
Literature Search August 2019
PubMed
Web of Science
Not prioritized for screening
Ammonium perfluorooctanoate
Perfluorooctanoic acid
•
PFBA
Protocol References
•
PFNA
Litsearch Update 2017-2018
Pubmed
Toxline
Literature Search
Pubmed
Toxline
•
PFOA (335-67-1) and PFOS (1763-23-1)
Literature Search – Adverse outcome pathway (2015-present)
Pubmed
Screening Results
In vitro/ex vivo/in silico
Receptor activation
Peroxisomal proliferation
Other mechanistic studies
Literature Search Update (2013-2019)
PubMed
WOS
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