Unique nigral and cortical pathways implicated by epigenomic and transcriptional analyses in rotenone Parkinson's model.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model study (non-human experimental design)
PubMed 40707475 · doi:10.1038/s41531-025-01049-1
What was done
Researchers evaluated the molecular effects of the pesticide rotenone in a rat model of Parkinson's disease. They mapped active chromatin regulatory elements using H3K27ac ChIP-sequencing and measured gene expression changes using RNA-sequencing in both the substantia nigra and the motor cortex.
What was found
The abstract reports no numerical values, effect sizes, or sample sizes. Qualitatively, despite uniform complex I mitochondrial inhibition across both evaluated brain regions, rotenone induced divergent, region-specific changes: the substantia nigra demonstrated marked immune pathway activation (specifically involving the C1q complement cascade), whereas the motor cortex primarily showed dysregulation of synaptic function pathways.
Why it matters
This study provides mechanistic insight into how systemic environmental pesticide exposure can drive region-specific transcriptional and epigenetic responses, potentially explaining the selective vulnerability of the substantia nigra in Parkinson's disease.
Limits
The study is restricted to an animal model (rats), which may not accurately reflect the timeline or pathology of human Parkinson's disease. The abstract provides no quantitative metrics, confidence intervals, or sample sizes, and does not report whether these molecular signatures were directly linked to motor deficits or dopaminergic neurodegeneration.
Cited by
- supports In a rotenone rat model, there is a striking upregulation of the complement cascade and C1q in the substantia nigra.