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Related Experiment Video

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ALS - Motor Neuron Disease: Mechanism and Development of New Therapies

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Published on: July 29, 2007

Pathophysiologic insights into motor axonal function in Kennedy disease.

Steve Vucic¹, Matthew C Kiernan

¹Prince of Wales Medical Research Institute, University of New South Wales, Sydney, Australia.

|November 7, 2007

Summary

This study reveals that an increased strength-duration time constant may cause axonal hyperexcitability and fasciculations in Kennedy disease (KD). These findings offer insights into the early pathophysiologic mechanisms of this neurodegenerative disorder.

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Published on: June 15, 2018

Area of Science:

Neuroscience
Genetics
Neurology

Background:

Kennedy disease (KD), or spinobulbomuscular atrophy, is a progressive inherited neurodegenerative disorder.
The genetic cause is a (CAG) repeat expansion in the androgen receptor (AR) gene.
Mechanisms underlying KD's clinical presentation remain unclear.

Purpose of the Study:

Investigate the pathophysiologic mechanisms of Kennedy disease.
Apply axonal excitability techniques to understand KD.
Explore the link between genetic factors and clinical symptoms in KD.

Main Methods:

Peripheral nerve excitability studies were conducted in 7 KD patients.
Compound muscle action potentials (CMAPs) were recorded from the abductor pollicis brevis.
Axonal excitability techniques, including strength-duration time constant and threshold electrotonus, were employed.

Main Results:

Patients with KD showed a significantly increased strength-duration time constant and hyperpolarizing current/threshold gradient compared to controls.
The strength-duration time constant correlated with CMAP amplitude and fasciculation frequency.
Threshold electrotonus indicated greater changes in response to depolarizing and hyperpolarizing pulses in KD patients, suggesting axonal hyperpolarization.

Conclusions:

An elevated strength-duration time constant may be an early event in Kennedy disease.
This increase contributes to axonal hyperexcitability and the generation of fasciculations, a key symptom of KD.
Findings provide insights into the early pathophysiologic mechanisms of Kennedy disease.