Reconstituted AIM2 inflammasome in cell-free system.

Area of Science:

• Immunology
• Molecular Biology

Background:

• Absent in melanoma 2 (AIM2) is an intracellular pattern-recognition receptor crucial for innate immunity.
• AIM2 forms inflammasomes upon sensing cytosolic DNA, activating caspase-1 and IL-1β secretion.
• Dysregulation of AIM2 inflammasome is linked to autoinflammatory and autoimmune diseases.

Purpose of the Study:

• To develop a cell-free system for screening AIM2 inflammasome-targeted therapeutic molecules.
• To overcome challenges of intracellular targeting for drug development.

Main Methods:

• Development of a reconstituted AIM2 inflammasome in a cell-free system.
• Utilized amplified luminescent proximity homogeneous assay (Alpha) for signal detection.
• Tested poly(dA:dT) as a ligand and evaluated inhibitors like CRID3 and glycyrrhizin.

Main Results:

• The cell-free system demonstrated a strong Alpha signal with the DNA ligand poly(dA:dT).
• No signal was detected with a Nod2 ligand, confirming specificity.
• The interaction between AIM2 and ASC was successfully inhibited by known compounds.

Conclusions:

• The reconstituted cell-free AIM2 inflammasome system is a viable tool for high-throughput screening.
• This platform facilitates the discovery of novel therapeutic agents targeting AIM2 inflammasome-mediated diseases.