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Updated: Jun 9, 2026

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation
Published on: March 5, 2018
Caspase-8 as a therapeutic target in cancer
1Department of Pathology & the Moores Cancer Center, University of California San Diego, 3855 Health Sciences Drive MC0803, La Jolla, CA 92093-0803, USA. dstupack@ucsd.edu
Abstract:
Caspase-8 is an apical caspase which initiates programmed cell death following death receptor ligation. This central role in apoptosis has prompted significant clinical interest in regulating caspase-8 expression and proteolytic activity. However, caspase-8 has also been found to play a number of non-apoptotic roles in cells, such as promoting activation NF-κB signaling, regulating autophagy and altering endosomal trafficking, and enhancing cellular adhesion and migration. Therefore, depending upon the specific cellular context, caspase-8 may either potentiate or suppress tumor malignancy. Accordingly, a marked heterogeneity exists in the expression patterns of caspase-8 among different tumor types. Therapeutics have been developed which can increase caspase-8 expression, yet it remains unclear whether this approach will be beneficial in all cases. Care is warranted, and the role of caspase-8 should be addressed on a case by case basis.
Insights
Caspase-8 initiates cell death but also has non-apoptotic functions. Its role in cancer varies, requiring careful, case-by-case evaluation for therapeutic strategies targeting caspase-8.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- Caspase-8 is a key initiator of apoptosis via death receptor pathways.
- Clinical interest focuses on modulating caspase-8 for cancer therapy.
- Caspase-8 exhibits diverse non-apoptotic functions, including NF-κB signaling and autophagy regulation.
Purpose of the Study:
- To explore the dual role of caspase-8 in tumor malignancy.
- To investigate the heterogeneity of caspase-8 expression in various cancers.
- To assess the implications of targeting caspase-8 expression therapeutically.
Main Methods:
- Review of existing literature on caspase-8 functions.
- Analysis of caspase-8 expression patterns across different tumor types.
- Evaluation of therapeutic strategies aimed at caspase-8 modulation.
Main Results:
- Caspase-8 can either promote or suppress tumor malignancy depending on cellular context.
- Significant heterogeneity in caspase-8 expression is observed across diverse cancers.
- Therapeutics increasing caspase-8 expression may not be universally beneficial.
Conclusions:
- The role of caspase-8 in cancer is context-dependent and complex.
- Targeting caspase-8 requires a nuanced, case-by-case approach.
- Further research is needed to fully elucidate caspase-8's multifaceted roles in oncology.
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