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Related Experiment Videos

Prion protein expression and superoxide dismutase activity

D R Brown1, A Besinger

  • 1MRC Cambridge Centre for Brain Repair, E.D. Adrian Building, Forvie Site, Robinson Way, Cambridge CB2 2PY, UK. drb33@cam.ac.uk

The Biochemical Journal
|August 26, 1998
PubMed
Summary

Prion protein (PrPc) influences cellular resistance to oxidative stress by modulating copper-zinc superoxide dismutase (Cu,Zn SOD) activity. Higher PrPc levels correlate with increased Cu,Zn SOD activity, impacting cellular responses to oxidative damage.

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Area of Science:

  • Neurobiology
  • Biochemistry
  • Cellular Biology

Background:

  • The precise function of the prion protein (PrPc) is not fully understood.
  • PrPc expression may enhance cellular resistance to oxidative stress.
  • PrPc's potential role in modulating Cu/Zn superoxide dismutase (Cu,Zn SOD) activity has been proposed.

Purpose of the Study:

  • To investigate the relationship between PrPc expression levels and Cu,Zn SOD activity.
  • To explore how PrPc influences cellular responses to oxidative stress.
  • To determine if PrPc affects copper metabolism in relation to Cu,Zn SOD.

Main Methods:

  • Comparative analysis of Cu,Zn SOD activity in mice with varying PrPc expression (null, wild-type, overexpressing).
  • Western-blot and Northern-blot analysis to assess Cu,Zn SOD mRNA levels.

Related Experiment Videos

  • Metabolic labeling with radioactive copper and immunoprecipitation assays.
  • Enzymatic assays using a copper chelator (diethyldithiocarbamate) to assess Cu,Zn SOD inactivation.

    • Main Results:

    • Cu,Zn SOD activity increased proportionally with higher levels of PrPc expression.
    • Cu,Zn SOD mRNA levels remained consistent across all PrPc expression groups.
    • Mice overexpressing PrPc showed reduced oxidative stress resistance but increased glutathione peroxidase expression.
    • Copper incorporation into Cu,Zn SOD was higher in mice with elevated PrPc levels.
    • Cu,Zn SOD from high PrPc mice was more susceptible to inactivation by a copper chelator.

    Conclusions:

    • PrPc expression positively regulates Cu,Zn SOD activity.
    • PrPc may influence copper metabolism, affecting copper incorporation into Cu,Zn SOD.
    • These findings suggest a mechanism by which PrPc modulates cellular oxidative stress responses through copper-dependent regulation of Cu,Zn SOD.