Measuring IL-1β Processing by Bioluminescence Sensors II: The iGLuc System

Area of Science:

• Immunology
• Molecular Biology
• Cell Death

Background:

• Inflammasomes are critical protein complexes mediating host defense and inflammatory responses through caspase-1 activation.
• Caspase-1 activation leads to Interleukin-1 (IL-1) family cytokine maturation and pyroptosis, a form of programmed cell death.
• Current methods for assessing inflammasome activation lack suitability for high-throughput screening.

Purpose of the Study:

• To introduce a novel reporter system, iGLuc (IL-1β Gaussia luciferase fusion protein), for measuring inflammasome activation.
• To provide detailed protocols for utilizing the iGLuc reporter in various cell line models.
• To enable indirect measurement of IL-1β maturation as a readout for inflammasome activity.

Main Methods:

• Development of a novel fusion protein: iGLuc, combining IL-1β and Gaussia luciferase.
• Establishment of protocols for using iGLuc in transiently transfected and stably transduced cell lines.
• Quantification of inflammasome activation by measuring Gaussia luciferase activity released upon iGLuc cleavage.

Main Results:

• The iGLuc reporter system allows for indirect measurement of IL-1β maturation.
• Cleavage of iGLuc results in a measurable gain of Gaussia luciferase activity.
• The system facilitates rapid inflammasome reconstitution assays.

Conclusions:

• The iGLuc reporter provides a sensitive and adaptable tool for assessing inflammasome activation.
• This method enables high-throughput screening of compounds or conditions affecting inflammasome activity.
• The developed protocols support the application of iGLuc in diverse research settings for studying inflammatory pathways.