Profiling Cysteine Proteases Activities in Neuroinflammatory Cells

Area of Science:

• Chemical Biology
• Neuroscience
• Protease Inhibitors

Background:

• Cysteine proteases play a role in neurodegenerative diseases, but their exact function remains unclear.
• Developing specific tools to study these proteases is crucial for understanding disease mechanisms.

Purpose of the Study:

• To design and synthesize a novel activity-based probe (ABP) for cysteine proteases.
• To utilize the ABP as a chemical tool to profile cysteine protease activity in neurodegenerative cell models.
• To investigate the potential theranostic applications of the developed ABP.

Main Methods:

• Design and synthesis of FGA139, an ABP incorporating a bodipy fluorophore.
• Utilizing metathesis and click reactions in the synthetic route.
• Profiling cysteine protease activity (cathepsins B, L, calpain) in cell models via confocal imaging.
• Confirming ABP specificity through colocalization and competitive inhibition assays.

Main Results:

• FGA139 was successfully synthesized and demonstrated specificity for cysteine proteases.
• The ABP effectively profiled cathepsin B, L, and calpain activities in neurodegenerative cell models.
• FGA139 showed a protective role against oxidative stress and inflammatory toxicity in cell lines.
• The probe attenuated macrophage activation induced by lipopolysaccharide (LPS).

Conclusions:

• FGA139 serves as a valuable chemical tool for studying cysteine protease activity.
• The probe exhibits potential theranostic properties, offering protection against cellular damage.
• Findings suggest FGA139 could be explored further for therapeutic interventions in neurodegenerative and inflammatory conditions.