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Related Experiment Videos

The motor cortex and amyotrophic lateral sclerosis.

A Eisen1, M Weber

  • 1Neuromuscular Diseases Unit, First Floor Willow Pavilion, Vancouver General Hospital, 855 West 12th Avenue, Vancouver, British Columbia V5Z 1M9, Canada. eisen@interchange.ubc.ca

Muscle & Nerve
|March 27, 2001
PubMed
Summary

Amyotrophic lateral sclerosis (ALS) involves "dying-forward" degeneration of motor neurons, driven by excitotoxicity from dysfunctional motor cortex neurons. This contrasts with primary lateral sclerosis (PLS), where motor neurons survive longer due to preserved pathways.

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Area of Science:

  • Neuroscience
  • Neurology
  • Motor Neuron Diseases

Background:

  • Amyotrophic lateral sclerosis (ALS) and primary lateral sclerosis (PLS) are motor neuron diseases with distinct pathological mechanisms.
  • Theories suggest motor cortex abnormalities cause degeneration in anterior horn cells (anterograde) or vice versa (retrograde).

Purpose of the Study:

  • To investigate the predominant degeneration pathway in ALS.
  • To differentiate the mechanisms underlying ALS and PLS.

Main Methods:

  • Review of clinical, neuropathological, imaging, and physiological studies.
  • Theoretical modeling of transneuronal degeneration processes.

Main Results:

  • Evidence favors anterograde ("dying-forward") degeneration in ALS, originating from the motor cortex.

Related Experiment Videos

  • Transneuronal degeneration in ALS is hypothesized to be an excitotoxic process.
  • Slower degeneration in PLS precludes excitotoxicity, explaining anterior horn cell survival.

    • Conclusions:

    • Anterograde excitotoxic degeneration is a key mechanism in ALS.
    • Distinct pathological pathways differentiate ALS from PLS, impacting disease progression and motor neuron survival.