Photoactivatable Oligoelectrolytes Engendering Pyroptotic Vesicles.

Area of Science:

• Biomedical Engineering
• Photochemistry
• Nanotechnology

Background:

• Phototherapies face limitations in hypoxic environments due to oxygen dependence.
• Current methods lack mechanistic clarity and precise control over photochemical activation.
• Developing oxygen-independent phototherapies is crucial for treating hypoxic conditions.

Purpose of the Study:

• To develop a molecularly defined, membrane-anchored system for oxygen-independent phototherapy.
• To investigate the mechanism of action and theranostic potential of the designed molecule.
• To establish a framework for hypoxia-resistant phototherapy with real-time monitoring.

Main Methods:

• Synthesized a membrane-anchored conjugated oligoelectrolyte (NDI-COE) with specific functional groups.
• Investigated its integration into lipid bilayers and photoinduced charge separation.
• Assessed reactive oxygen species (ROS) generation, pyroptosis activation, and fluorescence properties.

Main Results:

• NDI-COE efficiently inserts into lipid bilayers, generating O2•− and •OH upon irradiation.
• The molecule induces potent cytotoxicity and activates pyroptosis via the caspase-3/GSDME pathway.
• Membrane engagement enhances NDI-COE fluorescence, enabling visualization of pyroptotic vesicles.

Conclusions:

• NDI-COE provides a hypoxia-resistant phototherapy strategy by utilizing oxygen-independent water oxidation.
• The system acts as a theranostic agent, allowing real-time monitoring of pyroptotic vesicle formation.
• This work offers a novel framework for phototherapy and monitoring pyroptosis for immunotherapy.