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Zinc and copper in the pathogenesis of amyotrophic lateral sclerosis

J L Elliott1

  • 1Department of Neurology, University of Texas Southwestern Medical Center, Dallas 75235, USA. jellio@mednet.swmed.edu

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|July 28, 2001
PubMed

Insights

Familial amyotrophic lateral sclerosis (ALS) can be caused by mutations in the Cu,Zn superoxide dismutase (SOD1) gene. These SOD1 mutations lead to toxic gain of function, causing cellular damage and disease progression.

Area of Science:

  • Neuroscience
  • Genetics
  • Biochemistry

Background:

  • Missense mutations in the Cu,Zn superoxide dismutase (SOD1) gene are linked to familial amyotrophic lateral sclerosis (FALS).
  • FALS pathogenesis involves a toxic gain of function by the mutant SOD1 enzyme.
  • Wild-type SOD1 exhibits dismutase activity but can also engage in potentially harmful reactions like peroxidation and nitration.

Purpose of the Study:

  • To investigate the mechanisms underlying SOD1-related toxicity in FALS.
  • To explore how FALS-associated SOD1 mutations alter enzyme function.
  • To understand the role of hydroxyl radical formation and protein nitration in FALS.

Main Methods:

  • Genetic analysis of SOD1 mutations in FALS patients.
  • Biochemical assays to assess SOD1 enzyme activity and function.
  • Cellular studies to evaluate the impact of mutant SOD1 on cellular damage.

Main Results:

  • FALS-associated SOD1 mutations increase the likelihood of harmful enzymatic reactions.
  • Mutant SOD1 promotes increased hydroxyl radical formation.
  • Mutant SOD1 leads to increased nitration of tyrosine residues in cellular proteins.

Conclusions:

  • Mutant SOD1 contributes to FALS through a toxic gain of function.
  • Altered enzymatic activities of SOD1, including peroxidation and nitration, are key mechanisms of toxicity.
  • Understanding these mechanisms is crucial for developing therapeutic strategies for FALS.

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