Extrapyramidal system neurotoxicity: animal models.

This research article examines the effects of certain toxicants on the motor control function provided by the extrapyramidal system in the brain. The study uses various naturally occurring and experimental animal models to improve our understanding of how these toxicants can cause motor disorders, focusing on the similarities between signs in animals and humans.

The Extrapyramidal System and Toxicants

• The extrapyramidal system is an essential part of the central nervous system that is responsible for involuntary motor control over the muscles in the head, neck, and limbs. This system plays a significant role in the regulation of motor functions and when it’s disturbed can lead to debilitating motor coordination syndromes such as Parkinson’s disease, secondary parkinsonism, and other degenerative diseases of the basal ganglia.
• The toxicants affecting this system are thereby clinically characterized by impaired motor control caused by basal ganglionic dysfunction. These toxicants include but are not limited to certain drugs, carbon monoxide, rotenone, cyanide, and manganese.

Animal Models and Extrapyramidal Syndromes

• The study discusses several naturally occurring and experimental animal models that target the extrapyramidal system to understand the pathogenesis of different extrapyramidal syndromes. These syndromes are associated with antipsychotic drugs, carbon monoxide, reserpine, cyanide, rotenone, paraquat, 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), and manganese.
• Animal models are crucial in these studies because they help in understanding the toxicity and pathogenesis of these agents. An example mentioned in the study is yellowstar thistle poisoning in horses, which naturally occurs and causes Parkinsonism.

Link Between Animal Models and Humans

• These animal models help us draw parallels between the clinical signs, the neurochemical changes, and neuropathology present in both animals and humans affected by these toxicants. Thus, enhancing the understanding of how toxicants affecting the extrapyramidal system could lead to different motor disorders.
• One of the main goals is to find the concordance among the results from the animal models and what is clinically observed in humans. This would provide beneficial insights that would improve the therapeutic interventions and preventions of these extrapyramidal syndromes.