Title: An adverse outcome pathway for parkinsonian motor deficits associated with mitochondrial complex I inhibition
Authors: TERRON ANDREAPRICE ANNAPAINI ALICIAMONNET-TSCHUDI FLORIANNEHOUGAARD BENNEKOU SUSANNELEIST MARCELSCHILDKNECHT STEFAN
Citation: ARCHIVES OF TOXICOLOGY p. 1-42
Publisher: SPRINGER HEIDELBERG
Publication Year: 2018
JRC N°: JRC108775
ISSN: 0340-5761
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC108775
DOI: 10.1007/s00204-017-2133-4
Type: Articles in periodicals and books
Abstract: Epidemiological studies have observed an association between pesticide exposure and the development of Parkinson’s disease, but have not established causality allowed or of the molecular processes involved. The concept of an adverse outcome pathway (AOP) has been developed as a framework for the organization of available information linking the modulation of a molecular target (molecular initiating event [MIE]), via a sequence of essential biological key events (KEs), with an adverse outcome (AO). Here, we present an AOP that describes the toxicological pathways that link the binding of an inhibitor to mitochondrial complex I (i.e., the MIE) with the onset of parkinsonian motor deficits (i.e., the AO). This AOP was developed according to the Organisation for Economic Co-operation and Development (OECD) guidelines and uploaded to the AOP database. The KEs linking complex I inhibition to parkinsonian motor deficits are mitochondrial dysfunction, impaired proteostasis, neuroinflammation, and the degeneration of dopaminergic neurons of the substantia nigra. These KEs, by convention, were linearly organized. However, there was also evidence of additional feed-forward connections and shortcuts between the KEs, possibly depending on the intensity of the insult and the model system applied. The present AOP demonstrates mechanistic plausibility for epidemiological observations on a relationship between pesticide exposure and an elevated risk for Parkinson’s disease development.
JRC Directorate:Health, Consumers and Reference Materials

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