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Characterisation of the anti-apoptotic function of survivin-DeltaEx3 during TNFalpha-mediated cell death

M-H Malcles1, H-W Wang, A Koumi

  • 1Cancer Research UK Viral Oncology Group, Wolfson Institute for Biomedical Research, University College, London, UK.

British Journal of Cancer
|May 17, 2007
PubMed

Insights

Survivin-DeltaEx3, a cancer-promoting protein variant, inhibits apoptosis by forming a complex with Bcl-2 and caspase-3. Targeting this specific variant may offer a novel cancer treatment strategy.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Cell Death Research

Background:

  • Survivin is an oncogenic protein crucial for cell division and apoptosis inhibition.
  • High survivin expression in cancers correlates with poor prognosis and treatment resistance.
  • Survivin has spliced variants, including survivin-DeltaEx3, which inhibits apoptosis via unknown mechanisms.

Purpose of the Study:

  • To elucidate the mechanisms by which survivin-DeltaEx3 inhibits TNFalpha-mediated apoptosis.
  • To investigate the interaction of survivin-DeltaEx3 with apoptotic pathway components.

Main Methods:

  • Characterization of survivin-DeltaEx3 function in TNFalpha-mediated apoptosis.
  • Analysis of protein complex formation involving survivin-DeltaEx3, Bcl-2, and caspase-3.

Main Results:

  • Survivin-DeltaEx3 acts as an adaptor protein, facilitating the formation of a Bcl-2/survivin-DeltaEx3/caspase-3 complex.
  • The Bcl-2/survivin-DeltaEx3 complex, not survivin-DeltaEx3 alone, inhibits activated caspase-3 activity.
  • Survivin-DeltaEx3 links Bcl-2 to the postmitochondrial apoptotic machinery, controlling the mitochondrial apoptotic checkpoint.

Conclusions:

  • Survivin-DeltaEx3 plays a critical role in suppressing caspase-3 activity and regulating apoptosis.
  • Targeting survivin-DeltaEx3, rather than survivin broadly, presents a promising strategy for cancer therapy.

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