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Chronic systemic pesticide exposure reproduces features of Parkinson's disease
R Betarbet1, T B Sherer, G MacKenzie
1Department of Neurology, Emory University, 1639 Pierce Drive, WMB 6000, Atlanta, Georgia 30322, USA.
Abstract:
The cause of Parkinson's disease (PD) is unknown, but epidemiological studies suggest an association with pesticides and other environmental toxins, and biochemical studies implicate a systemic defect in mitochondrial complex I. We report that chronic, systemic inhibition of complex I by the lipophilic pesticide, rotenone, causes highly selective nigrostriatal dopaminergic degeneration that is associated behaviorally with hypokinesia and rigidity. Nigral neurons in rotenone-treated rats accumulate fibrillar cytoplasmic inclusions that contain ubiquitin and alpha-synuclein. These results indicate that chronic exposure to a common pesticide can reproduce the anatomical, neurochemical, behavioral and neuropathological features of PD.
Insights
Pesticide exposure, specifically rotenone, can trigger Parkinson's disease (PD) symptoms and brain changes. This study shows rotenone causes selective neuron loss and protein clumps seen in PD.
Area of Science:
- Neuroscience
- Toxicology
- Environmental Health
Background:
- The etiology of Parkinson's disease (PD) remains largely unknown.
- Epidemiological data suggest a potential link between pesticide exposure and PD.
- Biochemical evidence points to mitochondrial complex I dysfunction in PD.
Purpose of the Study:
- To investigate the effects of chronic systemic exposure to the pesticide rotenone on the nigrostriatal dopaminergic system.
- To determine if rotenone exposure can replicate the key features of Parkinson's disease.
Main Methods:
- Administered rotenone, a lipophilic pesticide, systemically to rats for chronic exposure.
- Assessed neurochemical, behavioral, and neuropathological changes, focusing on nigrostriatal dopaminergic neurons.
- Examined neuronal inclusions for ubiquitin and alpha-synuclein.
Main Results:
- Chronic rotenone exposure induced selective degeneration of nigrostriatal dopaminergic neurons.
- Treated rats exhibited behavioral deficits, including hypokinesia and rigidity.
- Nigral neurons developed fibrillar cytoplasmic inclusions containing ubiquitin and alpha-synuclein.
Conclusions:
- Chronic systemic exposure to rotenone can recapitulate the hallmark features of Parkinson's disease.
- This pesticide may serve as a valuable tool for studying PD pathogenesis.
- Environmental toxins like rotenone are plausible contributors to Parkinson's disease development.