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Updated: Jul 6, 2026

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation
08:47

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation

Published on: March 5, 2018

Development of a bidirectional caspase-3 expression system for the induction of apoptosis

Martyn K White1, Shohreh Amini, Kamel Khalili

  • 1Department of Neuroscience, Center for Neurovirology, Temple University School of Medicine, Philadelphia, Pennsylvania 19122, USA.

Cancer Biology & Therapy
|April 2, 2008
PubMed

Insights

Researchers developed a novel protein transduction system to deliver active caspase-3 into cells, inducing apoptosis. This method utilizes engineered fusion proteins for efficient cell entry and secretion, showing therapeutic potential for cell death induction.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Caspase-3 is a key executioner enzyme in apoptosis, crucial for programmed cell death.
  • Active caspase-3 is a tetramer of p12 and p17 subunits, formed by procaspase-3 cleavage.

Purpose of the Study:

  • To engineer a novel protein transduction system for delivering active caspase-3 into cells.
  • To investigate the potential of this system for inducing apoptosis and its therapeutic applications.

Main Methods:

  • Constructed GFP-fusion proteins of caspase-3 p12 and p17 subunits.
  • Incorporated secretion (Sec) and nuclear localization signals (NLS) into the fusion proteins.
  • Treated target cells with conditioned media from cells expressing these engineered proteins.

Main Results:

  • Conditioned media containing both Sec-GFP-p17-NLS and Sec-GFP-p12-NLS successfully transduced active caspase-3 into cells.
  • This transduction led to apoptosis and cell death in treated cultures.
  • Both subunits and the Sec/NLS signals on each were essential for effective protein transduction and apoptosis induction.

Conclusions:

  • A bidirectional protein transduction system capable of delivering active caspase-3 into cells has been established.
  • This system effectively induces apoptosis, suggesting significant potential for therapeutic applications in controlling cell death.

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