Common pesticide linked to 2.5 times the risk of Parkinson’s disease — SkimNews
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- UCLA Health researchers compared 829 people diagnosed with Parkinson's disease with 824 who did not have the condition, combining California pesticide-application records with participants' residential and workplace address histories.
- Long-term residential chlorpyrifos exposure was associated with more than 2.5 times the risk of developing Parkinson's disease compared with no such exposure, but the population analysis could not establish direct causation.
- Chlorpyrifos delivered to mice as aerosol for 11 weeks produced movement difficulties, loss of dopamine-producing neurons, brain inflammation and abnormal alpha-synuclein accumulation.
- Zebrafish experiments found that chlorpyrifos disrupted autophagy, the cellular recycling process that clears damaged proteins and unwanted material, allowing damaging material to accumulate and contribute to neuronal deterioration.
- Autophagy restoration or removal of synuclein protected neurons in laboratory experiments, providing a therapeutic target that still requires testing in humans.
- Chlorpyrifos remains in use on many U.S. crops despite a 2001 residential-use ban and additional agricultural restrictions in 2021, and continues to be widely applied in other countries.
- Jeff Bronstein, the study's senior author, said the findings establish chlorpyrifos as a specific environmental risk factor rather than pesticides as a general class and that the animal-model mechanism makes the association likely causal.
Why it matters: The more-than-2.5-fold association narrows attention from pesticides generally to chlorpyrifos, while the autophagy results give researchers a defined therapeutic target. For people with substantial prior exposure, the authors identify closer neurological monitoring as a potential benefit, though protective effects remain confined to laboratory models.
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