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Serial killers: ordering caspase activation events in apoptosis
E A Slee1, C Adrain, S J Martin
1Division of Molecular & Cell Biology, Smurfit Institute of Genetics, Trinity College, Dublin 2, Ireland.
Cell Death and Differentiation
|December 1, 1999
Summary
Caspases are key regulators of apoptosis, acting as triggers, regulators, and effectors. Research clarifies the order of caspase activation, revealing complex roles beyond simple upstream or downstream functions.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Caspases are crucial proteases involved in regulating apoptosis (programmed cell death).
- The mammalian caspase family comprises 14 members, but their precise roles in apoptosis remain under investigation.
- Understanding the caspase cascade is essential for deciphering cell death signaling pathways.
Purpose of the Study:
- To elucidate the repertoire and activation order of caspases during apoptosis.
- To investigate the functional roles of different caspases within the apoptotic cascade.
- To re-evaluate the traditional demarcation of caspases into signaling (upstream) and effector (downstream) roles.
Main Methods:
- Review and synthesis of current research on caspase activation and function in apoptosis.
- Analysis of evidence regarding caspase aggregation in initiating proximal activation events.
- Examination of data challenging the prodomain length-based classification of caspases.
Main Results:
- Evidence suggests proximal caspase activation is often initiated by molecules promoting caspase aggregation.
- Distal caspase activation is typically controlled by caspases activated earlier in the cascade.
- Recent findings challenge the strict functional division of caspases based on prodomain length, indicating roles beyond signaling or effector functions.
Conclusions:
- The caspase cascade in apoptosis is complex, involving intricate hierarchies of activation events.
- Caspase-3, in particular, may play a significant role in propagating the caspase cascade, in addition to its effector functions.
- Further research is needed to fully delineate the roles and interactions of all mammalian caspases in apoptosis.