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Updated: Aug 24, 2026
In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
Published on: November 27, 2016
Caspase knockouts: matters of life and death
1Section of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA. timothy_zheng@biogen.com
Abstract:
Apoptosis, the seemingly counter-intuitive act of physiological cell suicide, is accomplished by an evolutionarily conserved death program that is centered on the activation of a group of intracellular cysteine proteases known as caspases. It is now clear that both extra- and intra-cellular stimuli induce apoptosis by triggering the activation of these otherwise latent proteases in a process that culminates in caspase-mediated disintegration of cellular contents and their subsequent absorption by neighboring cells. While many elegant in vitro studies have demonstrated the requirement of caspase activities for the execution of most, if not all, apoptosis, the precise contribution of individual caspases in vivo and how they functionally relate to each other remain poorly elucidated. Fortunately, the generation of various caspase deficient mice through gene targeting has provided a unique window of opportunity to definitely examine the physiological function of these caspases in vivo. As the list of caspase knockouts grows, we considered it was time to review what we have been learned, from these studies about the exact role of individual caspases in mediating apoptotic events. We will also provide our prediction on the direction of future studies in this ever-growing field of caspases.
Insights
Physiological cell suicide, or apoptosis, relies on caspases (cysteine-aspartic proteases). Gene-targeted caspase-deficient mice reveal individual caspase roles in apoptosis, advancing our understanding of this cell death program.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Apoptosis is a crucial physiological process of programmed cell death.
- Caspases, a family of cysteine proteases, are central executioners of apoptosis.
- While in vitro studies highlight caspase importance, their in vivo functions and interactions are less understood.
Purpose of the Study:
- To review and elucidate the specific in vivo roles of individual caspases in mediating apoptosis.
- To understand the functional relationships between different caspases.
- To predict future research directions in caspase biology.
Main Methods:
- Analysis of data from gene-targeted caspase-deficient mouse models.
- Review of existing in vitro and in vivo studies on caspase function.
- Synthesis of current knowledge on caspase-mediated apoptosis.
Main Results:
- Caspase-deficient mice provide critical insights into the in vivo functions of specific caspases.
- The precise contribution and interplay of individual caspases in apoptosis are becoming clearer through these studies.
- This review consolidates findings on the physiological roles of caspases.
Conclusions:
- Gene-targeted knockout mouse models are essential for dissecting caspase functions in vivo.
- Further research is needed to fully elucidate the complex network of caspase interactions in apoptosis.
- Understanding caspase roles is key to advancing research in cell death and related diseases.
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