Caspase-8: Arbitrating Life and Death in the Innate Immune System.

Area of Science:

• Molecular Biology
• Cell Biology
• Immunology

Background:

• Caspase-8 traditionally induces apoptosis for tissue homeostasis and removal of damaged cells.
• Emerging research highlights non-canonical roles for caspase-8 in inflammation, immunity, and cell differentiation.
• The activity and interactions of caspase-8 are modulated by its isoforms and post-translational modifications.

Purpose of the Study:

• To review the impact of alternative splicing on caspase-8 function.
• To discuss how post-translational modifications influence caspase-8 activity and localization.
• To explore the expanded roles of caspase-8 beyond apoptosis.

Main Methods:

• Literature review of studies on caspase-8 alternative splicing.
• Analysis of research on caspase-8 post-translational modifications (phosphorylation, ubiquitination).
• Synthesis of findings on caspase-8's canonical and non-canonical functions.

Main Results:

• Alternative splicing generates diverse caspase-8 isoforms, affecting its protein interactions and functions.
• Post-translational modifications like phosphorylation and ubiquitination are critical regulators of caspase-8 activity and cellular location.
• Caspase-8 exhibits versatile roles in apoptosis, inflammation, immunity, and cell differentiation.

Conclusions:

• Alternative splicing and post-translational modifications significantly expand the functional repertoire of caspase-8.
• Understanding these regulatory mechanisms is key to elucidating caspase-8's multifaceted roles in cellular processes.
• Caspase-8 is a crucial regulator with implications for both homeostasis and disease pathology.