Effects of Commonly Used Pesticides in China on the Mitochondria and Ubiquitin-Proteasome System in Parkinson's Disease.
Level 5 - mechanism / opinion, no new human data
In vitro bench study evaluating cellular mechanisms with no human data
PubMed 29168786 · doi:10.3390/ijms18122507
What was done
The authors evaluated the cellular neurotoxic effects of nine pesticides widely used in China: paraquat, rotenone, chlorpyrifos, pendimethalin, endosulfan, fenpyroximate, tebufenpyrad, trichlorphon, and carbaryl. They measured changes in mitochondrial morphology, intracellular ATP levels, and 20S and 26S ubiquitin-proteasome system (UPS) activity following pesticide exposure.
What was found
All nine pesticides altered mitochondrial morphology at low concentrations. Seven pesticides (paraquat, rotenone, chlorpyrifos, pendimethalin, endosulfan, fenpyroximate, and tebufenpyrad) caused mitochondrial fragmentation. Five of these (paraquat, rotenone, chlorpyrifos, fenpyroximate, and tebufenpyrad) caused a significant dose-dependent decrease in intracellular ATP and inhibited 26S and 20S proteasome activity. Trichlorphon and carbaryl did not cause mitochondrial fragmentation, ATP reduction, or proteasome inhibition. Quantitative values and exact concentration thresholds were not reported in the abstract.
Why it matters
This study provides comparative mechanistic evidence linking specific agricultural pesticides to dual mitochondrial and proteasomal dysfunction relevant to Parkinson's disease models, while identifying agents that avoid these specific pathways.
Limits
The study is entirely in vitro and does not establish clinical causality or real-world exposure thresholds for human Parkinson's disease. The abstract does not specify the cell type, concentration ranges, exposure duration, sample size, or numerical effect sizes.
Cited by
- supports Pesticides such as paraquat and chlorpyrifos, as well as air pollution and solvents like TCE and PCE, damage the mitochondria in nerve cells.