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Proteases in apoptosis
B Zhivotovsky1, D H Burgess, S Orrenius
1Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
Abstract:
The interleukin-1 beta-converting enzyme (ICE)-like family proteases have recently been identified as key enzymes in apoptotic cell death. Among these proteases one can identify specific activities which may be involved in cytokine production or in resident protein cleavage. Several factors influence the constitutive apoptotic mechanism and may provide insight into the role of protease(s) in apoptosis. Although it appears that ICE family members play a most important role in promoting apoptotic cell death, evidence has been advanced that other proteases are also involved in sequential or parallel steps of apoptosis. Activation of a particular protease can lead to processing molecules either of the same or different proteases, leading to an activation of a protease cascade. Here we attempt to summarize the current thinking concerning these proteases and their involvement in apoptosis.
Insights
Interleukin-1 beta-converting enzyme (ICE)-like proteases are crucial for programmed cell death (apoptosis). Other proteases also contribute to apoptosis through complex activation cascades.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Interleukin-1 beta-converting enzyme (ICE)-like proteases are recognized as critical regulators of apoptotic cell death.
- These proteases exhibit diverse activities, including roles in cytokine production and endogenous protein cleavage.
- The apoptotic mechanism is influenced by various factors, offering insights into protease functions.
Purpose of the Study:
- To summarize current understanding of ICE-like proteases and their roles in apoptosis.
- To explore the involvement of other proteases in apoptotic pathways.
- To elucidate the mechanisms of protease activation cascades in programmed cell death.
Main Methods:
- Literature review and synthesis of existing research on proteases and apoptosis.
- Analysis of studies investigating ICE family proteases and their substrates.
- Examination of evidence for non-ICE proteases participating in apoptosis.
Main Results:
- ICE-like proteases are central to initiating and executing apoptosis.
- Specific protease activities within the ICE family are linked to distinct cellular processes.
- Evidence suggests a broader involvement of various proteases in sequential or parallel apoptotic steps.
- Protease activation can trigger cascades, amplifying the apoptotic signaling pathway.
Conclusions:
- ICE-like proteases are key mediators of apoptosis, but their function is part of a larger enzymatic network.
- Apoptosis involves complex protease interactions and activation cascades.
- Further research is needed to fully understand the interplay of different proteases in programmed cell death.