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ALTEX

Title:		Activation of TRPA1 by volatile organic chemicals leading to sensory irritation
Author(s):		Martinez JM; Eling TE;
Address:		"National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC, USA"
Journal Title:		ALTEX
Year:		2019
Volume:		20190418
Issue:		4
Page Number:		572 - 582
DOI:		10.14573/altex.1811012
ISSN/ISBN:		1868-8551 (Electronic) 1868-596X (Print) 1868-596X (Linking)
Abstract:		"Many volatile organic chemicals (VOCs) have not been tested for sensory pulmonary irritation. Development of in vitro non-animal sensory irritation assay suitable for a large number of chemicals is needed to replace the mouse assay. An adverse outcome pathway (AOP) is designed to provide a clear description of the biochemical and cellular processes leading to toxicological effects or an adverse outcome. The AOP for chemical sensory pulmonary irritation was developed according to the Organization for Economic Co-operation and Development guidance including the Bradford Hill criteria for a weight of evidence to determine the confidence of the AOP. The proposed AOP is based on an in-depth review of the relevant scientific literature to identify the initial molecular event for respiratory irritation. The activation of TRPA1 receptor (transient receptor potential cation channel, subfamily A, member 1) is the molecular initial event (MIE) leading to sensory irritation. A direct measure of TRPA1 activation in vitro should identify chemical sensory irritants and provide an estimate of potency. Fibroblasts expressing TRPA1 are used to determine TRPA1 activation and irritant potency. We report a linear relationship between the in vivo RD(5)(0) and the in vitro pEC(5)(0) values (R=0.81) to support this hypothesis. We propose that this in vitro assay after additional analysis and validation could serve as a suitable candidate to replace the mouse sensory irritation assay"
Keywords:		Adverse Outcome Pathways Animals HEK293 Cells Humans Mice Nasal Cavity/innervation TRPA1 Cation Channel/drug effects/*metabolism TRPV Cation Channels/drug effects/metabolism Trigeminal Nerve/physiology Volatile Organic Compounds/*pharmacology *sensory pul;
Notes:		"MedlineMartinez, Jeanelle M Eling, Thomas E eng Z01 ES010016/Intramural NIH HHS/ Germany 2019/04/27 ALTEX. 2019; 36(4):572-582. doi: 10.14573/altex.1811012. Epub 2019 Apr 18"