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Eukaryotic initiation factor 4E degradation during brain ischemia

R W Neumar1, D J DeGracia, B C White

  • 1Department of Emergency Medicine, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

Journal of Neurochemistry
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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Brain protein synthesis suppression after ischemia is linked to eukaryotic initiation factor 4E (eIF-4E) degradation. This proteolysis, potentially by mu-calpain, may limit recovery time after global brain ischemia.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Protein synthesis suppression in the brain after ischemic insult is primarily attributed to inhibited translation initiation.
  • Eukaryotic initiation factor 4E (eIF-4E) availability is a rate-limiting factor for the formation of translation initiation complexes for most eukaryotic mRNAs.

Purpose of the Study:

  • To investigate the changes in concentration and phosphorylation of brain eIF-4E following decapitation ischemia in rats.
  • To explore the potential role of eIF-4E degradation in neuronal injury during ischemia.

Main Methods:

  • Rat brain homogenates were analyzed using electrophoresis and western blotting.
  • Antibodies against eIF-4E and phosphoserine were employed to quantify protein levels and phosphorylation status.

Related Experiment Videos

  • In vitro experiments assessed the effect of activated mu-calpain on eIF-4E.

    • Main Results:

    • eIF-4E levels showed no significant change after 5 minutes of ischemia but decreased by 32% at 10 minutes and 57% at 20 minutes.
    • No significant loss of serine phosphorylation on eIF-4E was observed beyond that attributable to protein degradation.
    • In vitro exposure to activated mu-calpain caused a 50% loss of eIF-4E within 10 minutes.

    Conclusions:

    • Degradation of eIF-4E during ischemia, potentially mediated by activated mu-calpain, could be a direct mechanism of irreversible neuronal injury.
    • The rate of eIF-4E proteolysis may establish a critical time limit for global brain ischemia compatible with neurological recovery.