Somatosensory thresholds in monkeys exposed to acrylamide

Area of Science:

• Neuroscience
• Toxicology
• Sensory Physiology

Background:

• Acrylamide is a neurotoxin causing peripheral neuropathy.
• Assessing the time course of neuropathy and recovery is crucial for understanding its effects.

Purpose of the Study:

• To investigate the effects of acrylamide on sensory perception in monkeys.
• To evaluate vibration sensitivity testing as a method for monitoring neuropathy progression and recovery.

Main Methods:

• Six monkeys were trained to detect vibratory and electrical stimuli.
• Thresholds were measured before, during, and after oral acrylamide dosing (10 mg/kg).
• Monkeys were monitored for weight loss, behavioral changes, and visuomotor coordination (pickup test).

Main Results:

• Acrylamide induced weight loss, impaired coordination, and reduced vibration sensitivity.
• Vibration sensitivity deficits persisted for months after dosing ceased.
• Electrical sensitivity and visuomotor coordination recovered relatively quickly.
• Weight loss and impaired coordination preceded gross behavioral disturbances.

Conclusions:

• Vibration sensitivity testing effectively traces the time course of intoxication and recovery in toxic peripheral neuropathies.
• The findings suggest acrylamide primarily affects end-organ receptors, leading to differential impacts on vibratory versus electrical stimuli.
• Vibration sensitivity testing offers a sensitive biomarker for peripheral nerve damage and recovery.