Repin-induced neurotoxicity in rodents

Area of Science:

• Neuroscience
• Toxicology
• Environmental Science

Background:

• Russian knapweed ingestion causes equine nigropallidal encephalomalacia (ENE), a movement disorder mimicking Parkinson's disease (PD).
• Repin, a sesquiterpene lactone from Russian knapweed, is a reactive electrophile implicated in ENE.

Purpose of the Study:

• To investigate the neurotoxicity of repin in animal models.
• To elucidate the mechanism of repin-induced neurodegeneration and its relation to Parkinson's disease.

Main Methods:

• Administered repin to C57BL/6J mice and Sprague-Dawley rats.
• Assessed locomotion, tremors, hypothermia, and sensory responses.
• Measured striatal and hippocampal glutathione (GSH) and dopamine (DA) levels.
• Utilized striatal microdialysis in rats and cultured PC12 cells to examine DA release and uptake.

Main Results:

• Repin induced acute toxicity, including uncoordinated locomotion, tremors, and hypothermia.
• Repin intoxication reduced GSH levels and altered DA levels in mice and rats.
• Repin inhibited DA release in rats and PC12 cells without affecting DA uptake.

Conclusions:

• Repin inhibits dopamine release, a potential early event in equine nigropallidal encephalomalacia.
• Repin-induced neurotoxicity, mediated by oxidative stress, provides a model for studying Parkinson's disease pathogenesis.
• Understanding repin's mechanism may offer new insights into neurodegenerative pathways relevant to Parkinson's disease.