T-cell activity feedback-guided photothermal immunotherapy enabled by immune-responsive redox nanodots

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Immunogenic cell death (ICD) therapies face challenges with real-time immune monitoring and oxidative stress.
• Current treatments struggle to preserve immune function and ensure therapeutic consistency.

Purpose of the Study:

• To develop a novel nanodot platform (PCGA-ND) for enhanced photothermal therapy and immunogenic cell death.
• To create a system for real-time monitoring of immune activity and regulation of oxidative stress.
• To improve therapeutic precision and immune preservation in cancer treatment.

Main Methods:

• Synthesized ultrasmall polychlorogenic acid nanodots (PCGA-NDs) via oxidative polymerization.
• Developed a granzyme B responsive fluorescent probe integrated with PCGA-NDs.
• Utilized PCGA-NDs for photothermal tumor ablation and ROS scavenging in a 4T1 breast cancer model.

Main Results:

• PCGA-NDs demonstrated high stability and retained electrochemical/optical activity.
• Photothermal therapy induced significant tumor ablation and ICD.
• The system successfully scavenged ROS, preserved T-cell cytotoxic activity, and enabled real-time immune monitoring.
• Achieved 99.42% tumor growth inhibition and increased CD8+ T-cell infiltration by over 13-fold.

Conclusions:

• The developed PCGA-ND platform offers a theranostic approach for photothermal therapy.
• This strategy enhances immune preservation and therapeutic accuracy through redox regulation and immune imaging.
• The framework provides a practical solution for improving photo-immunotherapy outcomes.