Self-amplifying pyroptosis nanoinducers enhance cancer immunotherapy through inflammasome priming and activation

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Immunotherapy

Background:

• Pyroptosis, an inflammatory programmed cell death, shows promise for cancer immunotherapy by activating the immune system.
• Current pyroptosis strategies face challenges including NF-κB priming failure, insufficient inflammasome activation, and poor light/oxygen penetration in tumors.

Purpose of the Study:

• To develop self-amplifying pyroptosis nanoinducers to overcome limitations in tumor immunotherapy.
• To enhance pyroptosis and trigger a robust antitumor immune response.

Main Methods:

• Constructed dendritic mesoporous gadolinium oxide (DM-Gd2O3) nanoparticles loaded with a peroxyoxalate chemiluminescence system.
• Encapsulated nanoparticles within calcium carbonate (CaCO3) to create self-amplifying pyroptosis nanoinducers.
• Utilized pH-responsive ion release and chemiluminescence for inflammasome activation and singlet oxygen generation.

Main Results:

• Nanoinducers successfully primed NF-κB and induced lysosomal rupture in the tumor microenvironment.
• Chemiluminescence system generated singlet oxygen, overcoming hypoxia and light penetration issues.
• Demonstrated synergistic effects of pyroptosis and singlet oxygen, leading to significant antitumor immune responses in vitro and in vivo.

Conclusions:

• The developed self-amplifying pyroptosis nanoinducers represent a novel strategy for effective tumor immunotherapy.
• This approach addresses key challenges in the tumor microenvironment, offering a promising therapeutic avenue.