Precise Regulation of Reactive Oxygen Species in Tumor Microenvironment for Alleviating Inhibitory Immunogenic Cell...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• High reactive oxygen species (ROS) levels in the tumor microenvironment (TME) impede immunotherapy by damaging tumor cells and suppressing T lymphocytes.
• Effective cancer immunotherapy requires precise control over ROS levels to eliminate tumor cells and promote immunogenic cell death (ICD).

Purpose of the Study:

• To design an intelligent nanoplatform for precise ROS modulation within the TME.
• To enhance the efficacy of combined photodynamic therapy (PDT) and immunotherapy by managing ROS levels.

Main Methods:

• Development of a yolk-shell nanoplatform (SPCCM) with calcium carbonate shells releasing proanthocyanidins (PAs) and Ce6 in acidic TME.
• Utilizing PAs to scavenge ROS and protect T lymphocytes, while Ce6 induces ICD via laser irradiation.
• Assessing the synergistic effects of ROS modulation, PDT, and immunotherapy on tumor cell apoptosis, dendritic cell (DC) activation, and antitumor immunity.

Main Results:

• The SPCCM system effectively scavenged ROS in the TME, prolonging T lymphocyte survival.
• Photodynamic therapy with Ce6 induced tumor cell apoptosis and subsequent ICD.
• Proanthocyanidins enhanced DC activation by eightfold and restored antitumor immune cell activity suppressed by ROS.

Conclusions:

• The intelligent nanoplatform SPCCM enables precise ROS modulation for synergistic photodynamic and immune therapy.
• This approach overcomes ROS-induced immunosuppression, enhancing therapeutic outcomes in a preclinical cancer model.
• Precise ROS control is a critical strategy for advancing cancer immunotherapy.