Reconstituted phospholipid membrane-coated Fe²⁺-Mg²⁺ displacement nanoparticles block ferroptotic trigger waves

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cell Biology

Background:

• Ferroptotic trigger waves (FTWs) propagate cell-death signals, causing tissue dysfunction.
• Blocking FTWs is a potential therapy for iron accumulation diseases.

Purpose of the Study:

• Develop a nanocoupled system to block FTWs.
• Achieve precise cellular targeting, resist lipid peroxidation, and displace intracellular Fe2+.
• Enhance ferroptosis resistance and promote bone healing.

Main Methods:

• Synthesized Mg/Ce-MOF nanoparticles with radical scavenging and Fe2+-Mg2+ displacement capabilities.
• Coated nanoparticles with monounsaturated fatty acid phospholipids (MUFA-PLs) for enhanced targeting.
• Conducted in vitro and in vivo experiments in ovariectomized mice/rats.

Main Results:

• Mg/Ce-MOF@MUFA-PLs achieved near 100% Fe2+-Mg2+ displacement within 4 hours.
• Significantly increased MUFA-PLs in target cell membranes, enhancing nanoparticle delivery.
• Demonstrated over threefold improvement in ferroptosis resistance and redox systems.
• Showcased efficient bone mass enhancement and defect healing in animal models.

Conclusions:

• The nanocoupled system effectively blocks FTWs by targeting cellular mechanisms.
• This strategy offers a novel approach for treating iron accumulation-related diseases.
• The system shows promise for therapeutic applications in bone regeneration.