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Updated: May 11, 2026

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation
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Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation

Published on: March 5, 2018

Engineering a photoactivated caspase-7 for rapid induction of apoptosis

Evan Mills, Xi Chen, Elizabeth Pham

    ACS Synthetic Biology
    |May 9, 2013
    PubMed

    Insights

    Researchers engineered a light-activated protein switch (L57V) that triggers rapid apoptosis in targeted cells within 60 minutes of blue light exposure. This controlled cell death requires mitochondrial involvement for full commitment.

    Area of Science:

    • Cell biology
    • Molecular biology
    • Biotechnology

    Background:

    • Apoptosis is a crucial biological process for development, immunity, and disease.
    • Existing methods for controlling apoptosis are limited.
    • Targeted induction of apoptosis is desirable for therapeutic applications.

    Discussion:

    • The engineered L57V protein, a fusion of LOV2 and caspase-7, induces rapid apoptosis upon blue light stimulation.
    • Cells exhibit tolerance to short light exposures, indicating a threshold for caspase-7 activity.
    • Bcl-2 overexpression inhibits L57V-induced apoptosis, highlighting the necessity of mitochondrial pathways.

    Key Insights:

    • Light-inducible apoptosis offers precise spatiotemporal control over cell death.
    • The L57V system demonstrates the feasibility of optogenetic control of apoptosis.
    • Mitochondrial pathways are essential for complete commitment to apoptosis initiated by caspase-7.

    Outlook:

    • Potential applications in cancer therapy and regenerative medicine.
    • Further research into optimizing light delivery and protein expression.
    • Investigating in vivo efficacy and safety of light-activated apoptosis systems.

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