Purification of human eosinophil-derived neurotoxin

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Human and animal eosinophils contain a neurotoxin responsible for the Gordon phenomenon.
• This neurotoxin selectively damages cerebellar and spinal cord white matter, causing neuronal and axonal injury.

Purpose of the Study:

• To purify and characterize the eosinophil-derived neurotoxin.
• To confirm its neurotoxic activity and cellular location.

Main Methods:

• Purification of the neurotoxin from eosinophil granules using sequential chromatography (Sephadex G-50).
• Analysis of the purified protein by SDS-PAGE.
• Intrathecal injection into experimental animals to assess neurotoxic activity.
• Histological examination of animal brains and spinal cords.

Main Results:

• A single protein with a molecular weight of 18,400 Da was isolated.
• The purified eosinophil-derived neurotoxin induced the Gordon phenomenon in experimental animals, characterized by paralysis.
• Histology confirmed Purkinje cell loss and white matter vacuolation in the cerebellum, brain stem, and spinal cord.
• The neurotoxin was localized to eosinophil granules and differentiated from major basic protein and Charcot-Leyden crystal protein.

Conclusions:

• The eosinophil-derived neurotoxin is a distinct protein located within eosinophil granules.
• This purified neurotoxin is responsible for the Gordon phenomenon, causing selective white matter damage and paralysis.