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Updated: Jun 5, 2026

Preparation of Cell-lines for Conditional Knockdown of Gene Expression and Measurement of the Knockdown Effects on E4orf4-Induced Cell Death
Published on: October 21, 2012
The interferon stimulated gene 54 promotes apoptosis
Marcin Stawowczyk1, Sarah Van Scoy, K Prasanna Kumar
1Department of Molecular Genetics and Microbiology, Stony Brook University Stony Brook, New York 11794, USA.
Interferon-stimulated gene 54 (ISG54/IFIT2) directly induces apoptosis, a programmed cell death. This finding reveals a new mechanism for interferon's anti-viral and anti-cancer functions.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Interferons (IFNs) are crucial for antiviral and antiproliferative responses.
- The specific roles of individual IFN-stimulated genes (ISGs) in these processes are not fully elucidated.
Purpose of the Study:
- To investigate the function of ISG54 (IFIT2) in cellular responses.
- To determine if ISG54 mediates apoptosis independently of IFN stimulation.
Main Methods:
- Quantification of cell death using propidium iodide uptake.
- Assessment of apoptosis via annexin-V staining.
- Analysis of caspase-3 activation and protein-protein interactions.
Main Results:
- ISG54 expression induces apoptosis, evidenced by caspase-3 activation.
- Anti-apoptotic proteins Bcl-xl and adenoviral E1B-19K inhibit ISG54-mediated apoptosis.
- ISG54 requires pro-apoptotic Bax and Bak for cell death induction.
- ISG60/IFIT3 binding negatively regulates ISG54's apoptotic activity.
Conclusions:
- ISG54 is a novel mediator of apoptosis through a mitochondrial pathway.
- This discovery provides new insights into IFN-mediated antiviral and anticancer mechanisms.
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