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The involvement of caspase-11 in TPEN-induced apoptosis

Jong-Min Lee1, Yu-Jin Kim, Hana Ra

  • 1Department of Molecular Biology, Sejong University, 98 Gunja-Dong Gwangjin-Gu, Seoul 143-747, South Korea.

FEBS Letters
|May 14, 2008
PubMed

Insights

Zinc depletion using TPEN triggers programmed cell death (apoptosis) by activating caspase-11, a key protein in this process. This finding highlights caspase-11

Area of Science:

  • Cell Biology
  • Biochemistry
  • Neuroscience

Background:

  • Intracellular zinc depletion can induce apoptosis, a crucial process in cellular health and disease.
  • The specific molecular pathways, particularly caspase involvement, in TPEN-induced apoptosis remain incompletely understood.

Purpose of the Study:

  • To investigate the role of caspase activation in N,N,N',N'-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN)-induced apoptosis.
  • To elucidate the specific caspases involved and their contribution to neuronal cell death.

Main Methods:

  • Treatment of cells with TPEN to deplete intracellular zinc.
  • Analysis of caspase expression and activity, including caspase-11 and caspase-3.
  • Inhibition of caspase-11 using chemical inhibitors or genetic deletion.
  • Assessment of apoptosis using relevant assays.
  • Use of cycloheximide or actinomycin D to block protein synthesis.

Main Results:

  • TPEN treatment significantly increased the expression and activity of caspase-11.
  • Caspase-11 activation led to the subsequent activation of caspase-3.
  • Inhibition of protein synthesis blocked caspase-11 induction and attenuated TPEN-induced apoptosis.
  • Blocking caspase-11 activity, either chemically or genetically, significantly reduced TPEN-induced neuronal apoptosis.
  • Mitochondria-mediated caspase activation also contributed, but caspase-11 played a critical role.

Conclusions:

  • Caspase-11 is a key inducible protein in TPEN-induced apoptosis.
  • Caspase-11 activation is essential for the execution of TPEN-induced neuronal cell death.
  • Targeting caspase-11 may offer therapeutic strategies for conditions involving zinc dysregulation and apoptosis.

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