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NIH-funded twin study finds occupational chemical exposure may be linked to Parkinson's risk
Date:11/13/2011

cally identical twins, and half were fraternal twins.

The study team assessed the twins' lifetime work and hobby activities, specifically inquiring about occupational tasks such as electrical work, industrial machinery repair, and dry cleaning, which would potentially expose people to chemicals previously linked to Parkinson's. The researchers also collected information on head injuries, which are suspected to increase Parkinson's risk, and smoking history, which is reported to decrease Parkinson's risk. Expert evaluators, unaware of which study subjects had Parkinson's, reviewed this information and calculated lifelong exposure to six chemicals: TCE, PERC, carbon tetrachloride, n-hexane, xylene and toluene. Of these, TCE and PERC posed a notable risk for developing Parkinson's.

"The potential importance is great, since both solvents persist in the environment and are commonly used," said Dr. Goldman, "Parkinson's was sixfold more common in twins exposed to TCE, and ninefold more common in twins exposed to TCE or PERC." There was also a trend toward a tenfold increase in Parkinson's disease in twins exposed to PERC alone.

In this study researchers looked only at occupational chemical exposure, and the association with job categories tended toward significance only for the industrial machinery repairer and industrial worker categories. However, the chemicals evaluated here are found outside industrial settings as well. PERC is the leading chemical used in garment dry cleaning. TCE is the most frequently reported organic groundwater contaminant, was once used as general anesthetic and coffee decaffeinating agent, and is still used widely as a metal degreasing agent.

TCE has also been linked to Parkinson's by other research groups. Researchers at the University of Kentucky, Lexington, and the Kangwon National University in South Korea have reported an association between TCE and Parkinson's in highly-exposed industrial workers, an
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Contact: Nicole Garbarini
nindspressteam@ninds.nih.gov
301-496-5751
NIH/National Institute of Neurological Disorders and Stroke
Source:Eurekalert

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