Nanocapsuled Neutrophil Extracellular Trap Scavenger Combating Chronic Infectious Bone Destruction Diseases

Area of Science:

• Biomaterials Science
• Immunology
• Regenerative Medicine

Background:

• Chronic infectious bone diseases like periodontitis cause significant bone loss, posing a global health challenge.
• Repairing bone loss requires not only pathogen removal but also host immune regulation.
• Neutrophil extracellular traps (NETs) accumulation in chronic infections hinders inflammation resolution and bone healing.

Purpose of the Study:

• To investigate if degrading existing NETs in infectious bone lesions can resolve inflammation and promote bone repair.
• To develop a novel nanocapsule system for NET scavenging and antibacterial therapy in chronic bone infections.

Main Methods:

• Designed dual-responsive nanocapsules that scavenge NETs and are activated by near-infrared light.
• Utilized nanocapsules' photothermal and photodynamic effects for antibacterial properties.
• Evaluated the nanocapsules' ability to clear NETs, restore host response, and promote bone repair.

Main Results:

• The nanocapsules effectively scavenged NETs, acting as a microenvironment sensor.
• Photothermal and photodynamic properties provided antibacterial effects, clearing pathogens.
• NET clearance and antibacterial action facilitated inflammation resolution and restored normal host response.
• The nanocapsules demonstrated immunocorrective and pro-osteogenic effects, promoting local bone repair.

Conclusions:

• NET-scavenging nanocapsules offer a novel strategy for treating bone destruction in chronic infections.
• Correcting biased host responses by clearing excessive NETs is crucial for bone repair.
• This approach provides new concepts for managing chronic infectious diseases and associated bone loss.