Paraquat induces behavioral changes and cortical and striatal mitochondrial dysfunction

Area of Science:

• Neuroscience
• Toxicology
• Biochemistry

Background:

• Paraquat is a toxic herbicide known to increase superoxide anion production.
• Mitochondrial dysfunction is implicated in various neurological disorders.

Purpose of the Study:

• To investigate behavioral changes and mitochondrial function in rats exposed to paraquat.
• To assess paraquat's impact on cortical, hippocampal, and striatal mitochondria.

Main Methods:

• Rats received weekly paraquat injections (10mg/kg) for one month.
• Behavioral tests (elevated-plus maze) and olfactory function were evaluated.
• Mitochondrial respiration, enzyme activities, and hydrogen peroxide production were measured.

Main Results:

• Paraquat induced anxiety-like behavior and impaired sense of smell.
• Significant inhibition of NADH-cytochrome c reductase and decreased striatal cytochrome oxidase activity were observed.
• Mitochondria exhibited increased State 4 respiration, decreased State 3 respiration, and elevated hydrogen peroxide production, indicating dysfunction.

Conclusions:

• Paraquat exposure leads to significant mitochondrial dysfunction in cortical and striatal tissues.
• These findings link paraquat toxicity to nonmotor symptoms and neurochemical alterations.