Biodegradable Upconversion Nanoparticles Induce Pyroptosis for Cancer Immunotherapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Immunology

Background:

• Pyroptosis, a programmed cell death pathway, shows promise in cancer therapy.
• Developing efficient pyroptosis inducers for tumors remains a challenge.

Purpose of the Study:

• To investigate biodegradable K3ZrF7:Yb/Er upconversion nanoparticles (ZrNPs) as novel pyroptosis inducers for cancer immunotherapy.

Main Methods:

• ZrNPs were designed to dissolve within cancer cells, releasing K+ and [ZrF7]3- ions.
• This ion release triggers intracellular osmotic imbalance, increased reactive oxygen species (ROS), and activation of caspase-1 and gasdermin D (GSDMD).

Main Results:

• ZrNPs successfully induced pyroptosis, leading to cancer cell lysis.
• In vivo studies demonstrated enhanced dendritic cell (DC) maturity and effector-memory T cell frequency.
• ZrNPs significantly inhibited tumor growth and pulmonary metastasis, indicating potent antitumor immunity.

Conclusions:

• Biodegradable ZrNPs are effective pyroptosis inducers for cancer immunotherapy.
• This study expands the biomedical applications of upconversion nanomaterials and highlights their immunomodulatory potential.