Title: The Adverse Outcome Pathway approach in nanotoxicology
Publisher: Elsevier B.V.
Publication Year: 2016
JRC N°: JRC98561
ISSN: 2468-1113
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC98561
DOI: 10.1016/j.comtox.2016.07.001
Type: Articles in periodicals and books
Abstract: An Adverse Outcome Pathway (AOP) is a conceptual construct that describes existing knowledge on the link between a molecular initiating event and an adverse outcome. A sequential chain of causally related events is portrayed at different levels of biological organisation. AOPs are considered to be useful mechanistic blueprints for the development of novel tools for human and environmental risk assessment. Following OECD guidance, an increasing number of AOPs for chemically-induced adverse effects in humans and environmental species are being proposed. Due to their unique properties, the toxicity of nanomaterials (NMs) and chemicals is often difficult to directly compare since their modes of actions usually differ. While there are still many knowledge gaps in our understanding of NM toxicity, an ever increasing number of mechanistic studies are shedding light on their toxicokinetic and toxicodynamic properties. In this paper, we argue that the differences between NM and chemically induced adversity are primarily related to differences in toxicokinetics and the nature of the initial key events in the AOP. Consequently, much of the mechanistic knowledge captured by AOPs that have been developed from consideration of chemical induced toxicity is also relevant to describe AOPs of NMs, at least in qualitative terms, and thus can be used to inform predictive modelling of NM-toxicity. In support of these claims, we illustrate how the AOP framework can be used to rationally combine mechanistic knowledge relating to both NM- and chemically-induced liver toxicity to fill information gaps and guide the development of toxicity testing strategies.
JRC Directorate:Health, Consumers and Reference Materials

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