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Overexpressed mutant G93A superoxide dismutase protects calcineurin from inactivation

Shipeng Li1, Xutong Wang, Claude B Klee

  • 1Laboratory of Biochemistry, National Cancer Institute, NIH, Bethesda, MD 20892-4255, USA.

Brain Research. Molecular Brain Research
|June 15, 2004
PubMed

Insights

Mutant superoxide dismutase (mSOD) in amyotrophic lateral sclerosis (ALS) models protects calcineurin (CN) from inactivation, contrary to previous findings. Increased mSOD expression enhances CN protection, suggesting a protective role for mSOD in ALS pathogenesis.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Amyotrophic lateral sclerosis (ALS) pathogenesis involves oxidative stress and protein aggregation.
  • Mutant superoxide dismutase (mSOD) is implicated in ALS, with prior studies suggesting its failure to protect calcineurin (CN).
  • Calcineurin (CN) is a crucial phosphatase involved in neuronal function and survival.

Purpose of the Study:

  • To investigate the protective effect of mutant superoxide dismutase (G93A mSOD) on calcineurin (CN) activity in a murine model of ALS.
  • To re-evaluate the role of G93A mSOD in CN inactivation in the context of ALS.

Main Methods:

  • Utilized a transgenic mouse model overexpressing G93A mSOD.
  • Assessed the expression and activity levels of calcineurin (CN) in G93A mSOD overexpressing mice and non-transgenic controls.
  • Quantified the susceptibility of CN to inactivation in both groups.

Main Results:

  • No statistically significant differences in CN expression or activity were observed between G93A mSOD overexpressing mice and controls.
  • CN from G93A mSOD overexpressing mice exhibited significantly enhanced protection against inactivation compared to controls.
  • This increased protection of CN was directly correlated with the elevated expression of G93A mSOD.

Conclusions:

  • Contrary to previous claims, G93A mSOD does not fail to protect CN against inactivation in this ALS model.
  • Increased expression of G93A mSOD enhances CN protection, indicating a protective role similar to wild-type SOD.
  • These findings suggest a potential therapeutic avenue targeting SOD-CN interactions in ALS.

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