New insights into the noncanonical inflammasome point to caspase-4 as a druggable target

Area of Science:

• Immunology
• Molecular Biology
• Pathogenesis

Background:

• Human caspase-4, a lipopolysaccharide sensor, is constitutively expressed and distinct from its mouse homologue, caspase-11.
• Caspase-4 activation leads to pro-interleukin-18 (IL-18) processing and gasdermin D-mediated pyroptosis.

Purpose of the Study:

• To investigate the role of human caspase-4 in inflammatory responses.
• To explore the therapeutic potential of modulating caspase-4 activity.

Main Methods:

• Comparative analysis of human and mouse caspase function.
• Assessment of caspase-4-induced vascular leakage in vivo.
• Structural studies of caspase-4.

Main Results:

• Human caspase-4, but not mouse caspase-11, is constitutively expressed.
• Caspase-4 activation causes systemic and blood-brain barrier vascular leakage in mice.
• Structural insights suggest the caspase-4 exosite as a potential inhibitory target.

Conclusions:

• Human caspase-4 plays a critical role in inflammatory pathogenesis by inducing vascular leakage.
• Modulating caspase-4 activity presents a promising therapeutic avenue for inflammatory diseases.
• The caspase-4 exosite is a viable target for developing novel anti-inflammatory therapies.