Neurotoxicity of human eosinophils

Area of Science:

• Neuroscience
• Hematology
• Toxicology

Background:

• Eosinophils possess a substance inducing neurotoxicity in animals (Gordon phenomenon).
• Previous research noted Purkinje cell loss in affected animals.

Purpose of the Study:

• To investigate neurotoxic activity in eosinophils from patients with eosinophilic syndromes.
• To characterize the properties and molecular weight of the eosinophil-derived neurotoxin.

Main Methods:

• Injection of eosinophil preparations into rabbits and guinea pigs.
• Histopathological and electron microscopic examination of animal brains and nerves.
• Partial purification of the neurotoxin using ultracentrifugation and gel filtration.

Main Results:

• Eosinophils from patients induced paralysis and ataxia in test animals.
• Confirmed Purkinje cell loss and identified new white matter damage (spongy change) in the central nervous system.
• Partially purified neurotoxin has an estimated molecular weight of 15,000, is heat-labile, but stable to lyophilization and dialysis.

Conclusions:

• Eosinophils from patients with eosinophilic syndromes contain a potent neurotoxin.
• The toxin causes demyelination and axonal damage, impacting myelinated nerve fibers.
• This provides a model for studying neurotoxic mechanisms and potential clinical relevance requires further investigation.