Novel Allosteric Activators for Ferroptosis Regulator Glutathione Peroxidase 4

Area of Science:

• Biochemistry
• Pharmacology
• Drug Discovery

Background:

• Glutathione peroxidase 4 (GPX4) plays a crucial role in cell membrane repair, inflammation control, and ferroptosis regulation.
• GPX4's therapeutic potential for inflammatory and ferroptosis-related diseases is significant, but activating its enzyme activity presents a challenge.
• No prior compounds were known to activate GPX4 enzyme activity.

Purpose of the Study:

• To identify and characterize novel chemical activators of GPX4.
• To explore the potential of GPX4 activators in suppressing ferroptosis and inflammation.
• To validate the feasibility of rational design for allosteric GPX4 activators.

Main Methods:

• Utilized a novel computational strategy to identify a potential allosteric site on GPX4.
• Conducted virtual screening and experimental validation to discover GPX4 activators.
• Performed chemical synthesis and structure-activity relationship studies to optimize activator potency.

Main Results:

• Identified eight novel compounds that activate GPX4 enzyme activity.
• Compound 1 demonstrated increased GPX4 activity, ferroptosis suppression, reduced pro-inflammatory lipid mediators, and NF-κB pathway inhibition.
• The most potent compound, 1d4, enhanced GPX4 activity by 150% in cell-free assays and showed efficacy in cell extracts.

Conclusions:

• GPX4 can be directly activated by small chemical compounds.
• These GPX4 activators effectively suppress ferroptosis and inflammation.
• The discovery validates the potential for rational design of allosteric activators for GPX4.