Parkinson’s disease risk from ambient exposure to pesticides Authors
First Online: 20 April 2011 Received: 10 December 2010 Accepted: 23 March 2011 DOI:
Cite this article as: Wang, A., Costello, S., Cockburn, M. et al. Eur J Epidemiol (2011) 26: 547. doi:10.1007/s10654-011-9574-5 Abstract
Due to the heavy and expanding agricultural use of neurotoxic pesticides suspected to affect dopaminergic neurons, it is imperative to closely examine the role of pesticides in the development of Parkinson’s disease (PD). We focus our investigation on pesticide use in California’s heavily agricultural central valley by utilizing a unique pesticide use reporting system. From 2001 to 2007, we enrolled 362 incident PD cases and 341 controls living in the Central Valley of California. Employing our geographic information system model, we estimated ambient exposures to the pesticides ziram, maneb, and paraquat at work places and residences from 1974 to 1999. At workplaces, combined exposure to ziram, maneb, and paraquat increased risk of PD three-fold (OR: 3.09; 95% CI: 1.69, 5.64) and combined exposure to ziram and paraquat, excluding maneb exposure, was associated with a 80% increase in risk (OR:1.82; 95% CI: 1.03, 3.21). Risk estimates for ambient workplace exposure were greater than for exposures at residences and were especially high for younger onset PD patients and when exposed in both locations. Our study is the first to implicate ziram in PD etiology. Combined ambient exposure to ziram and paraquat as well as combined ambient exposure to maneb and paraquat at both workplaces and residences increased PD risk substantially. Those exposed to ziram, maneb, and paraquat together experienced the greatest increase in PD risk. Our results suggest that pesticides affecting different mechanisms that contribute to dopaminergic neuron death may act together to increase the risk of PD considerably.
Keywords Case–control study Geographic information systems (GIS) Paraquat Parkinson’s disease Pesticide Ziram Abbreviations CA DPR
California department of pesticide regulation
Geographic information system
Health insurance portability and accountability act
Public land survey system
Pesticide use report
University of California Los Angeles
Ubiquitin proteasome system
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