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Paraptosis: mediation by MAP kinases and inhibition by AIP-1/Alix

S Sperandio1, K Poksay, I de Belle

  • 1Buck Institute for Age Research, Novato, CA 94945, USA.

Cell Death and Differentiation
|June 15, 2004
PubMed

Insights

Programmed cell death (PCD) can be apoptotic or nonapoptotic. This study identifies mitogen-activated protein kinases (MAPKs) as mediators of paraptosis, a nonapoptotic PCD, and AIP-1/Alix as a specific inhibitor.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Programmed cell death (PCD) encompasses both apoptotic and nonapoptotic pathways.
  • While caspases mediate apoptosis, the molecular mechanisms of nonapoptotic PCD remain less understood.
  • Paraptosis is an alternative nonapoptotic cell death pathway with incompletely characterized mediators.

Purpose of the Study:

  • To elucidate the molecular mediators of paraptosis.
  • To investigate the role of mitogen-activated protein kinases (MAPKs) in paraptosis.
  • To identify potential inhibitors of paraptosis.

Main Methods:

  • Investigated insulin-like growth factor I receptor (IGFIR)-induced cell death.
  • Utilized MEK-2-specific inhibitors and antisense oligonucleotides against c-jun N-terminal kinase-1 (JNK-1).
  • Assessed caspase activation and the effect of caspase inhibitors.

Main Results:

  • Paraptosis was mediated by MAPKs, specifically JNK-1.
  • AIP-1/Alix specifically inhibited paraptosis, without affecting apoptosis.
  • Caspase activation was not observed during IGFIR-induced paraptosis, and caspase inhibitors were ineffective.

Conclusions:

  • IGFIR-induced paraptosis is mediated by MAPKs.
  • AIP-1/Alix acts as a specific inhibitor of paraptosis.
  • MAPKs represent key mediators in nonapoptotic cell death pathways.

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