Common pesticide linked to 2.5 times the risk of Parkinson’s disease — SkimNews
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- Chlorpyrifos was associated with more than 2.5 times the risk of developing Parkinson’s disease among people with prolonged residential exposure, compared with people who had no such exposure.
- UCLA Health researchers analyzed 829 people diagnosed with Parkinson’s and 824 without the condition, combining California pesticide-application records with residential and workplace address histories to estimate exposure.
- Chlorpyrifos exposure by aerosol for 11 weeks was followed in mice by movement difficulties, loss of dopamine-producing neurons, brain inflammation and abnormal alpha-synuclein accumulation.
- Chlorpyrifos disrupted autophagy in zebrafish, allowing damaged material to accumulate in neurons; restoring the cellular cleanup process or removing synuclein protected the cells.
- United States residential use of chlorpyrifos was banned in 2001 and its agricultural applications faced additional restrictions in 2021, but it remains in use on many U.S. crops and is widely applied in other countries.
- Jeff Bronstein called chlorpyrifos “a specific environmental risk factor for Parkinson’s disease, not just pesticides as a general class,” arguing that the animal-model mechanism makes the association likely causal even though the population study could not establish direct causation.
Why it matters: For researchers and clinicians, the more-than-2.5-fold association identifies a specific exposure to investigate rather than treating pesticides as one undifferentiated risk category. Impaired autophagy is identified as both the mechanism and a therapeutic target, but the human study cannot establish causation and neuron protection has only been shown in laboratory models.
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