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Common Chemicals Linked to Parkinson's Disease Risk

by Sheela Philomena on December 1, 2011 at 1:10 PM
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 Common Chemicals Linked to Parkinson's Disease Risk

Exposure to commonly used chemicals increases the risk of Parkinson's disease, shows study.

Dr Franca Cambi of the UK Kentucky Neuroscience Institute collaborated with researchers from across the U.S for the study, which looked at a cohort of human twins wherein one twin had been occupationally exposed to trichloroethylene (TCE) and other chemicals believed to be linked to development of Parkinson's.

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TCE has been previously linked to Parkinson's disease through prior research by University of Kentucky authors and others.

In the most recent paper, the authors demonstrated that in addition to TCE, increase in Parkinson's disease risk is also associated with exposure to percholorethylene (PERC) and carbon tetrachloride (CCI4).
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The current epidemiological study, led by Drs. Samuel Goldman and Caroline Tanner of The Parkinson's Institute in Sunnyvale, Ca., investigated exposure to TCE, PERC and CCI4 as they related to risk of developing Parkinson's disease.

The team interviewed 99 twin pairs in which one twin had Parkinson's and one didn't, inquiring about lifetime occupations and hobbies.

While prior research has indicated a link between TCE exposure and Parkinson's disease, the current findings are the first to report a statistically significant association-a more than six-fold increased risk.

Researchers also found that exposure to PERC and CCI4 tended toward significant risk of developing the disease.

This study focused on occupational exposures, but the solvents under investigation are pervasive in the environment.

"Our findings, as well as prior case reports, suggest a lag time of up to 40 years between TCE exposure and onset of Parkinson's, providing a critical window of opportunity to potentially slow the disease process before clinical symptoms appear," lead author Goldman said.

Occupational or environmental exposure to TCE, PERC and CCI4 is common due to the extensive use of the chemicals in dry-cleaning solutions, adhesives, paints, and carpet cleaners.

Despite the Food and Drug Administration (FDA) banning the use of TCE as a general anesthetic, skin disinfectant, and coffee decaffeinating agent in 1977, it is still widely used today as a degreasing agent.

The study has been recently published in the Annals of Neurology.

Source: ANI
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