Ferritin Nanocomplex-Empowered "Three Birds with One Stone" Strategy for Cancer Immunotherapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• The tumor microenvironment (TME) is immunosuppressive, hindering effective cancer immunotherapy.
• Current strategies face challenges due to off-target effects on tumor and immune cells.

Purpose of the Study:

• To develop a ferritin-albumin nanocomplex (IL@FA NPs) for dual targeting of tumor and immune cells.
• To enhance ferroptosis-induced tumor cell death and modulate immune cell activity within the TME.

Main Methods:

• Encapsulation of photosensitizer IR820 and lipoic acid (LA) within ferritin-albumin nanocomplexes (IL@FA NPs).
• Utilizing laser irradiation to trigger IR820 and LA release, inducing ferroptosis and reactive oxygen species (ROS) production.
• Evaluating the effects of IL@FA NPs on tumor cell death, dendritic cell (DC) maturation, and tumor-associated macrophage (TAM) repolarization (M2 to M1).

Main Results:

• IL@FA NPs selectively induced ferroptosis in tumor cells upon laser irradiation.
• Ferroptosis-induced immunogenic cell death (ICD) promoted DC maturation and CD8+ T cell activation.
• Laser-activated IL@FA NPs facilitated DC maturation and M2-to-M1 repolarization of TAMs via ROS production.
• Effective tumor growth suppression was achieved with no observed toxicities.

Conclusions:

• IL@FA NPs offer a promising "three birds with one stone" strategy for cancer immunotherapy.
• The approach synergistically enhances tumor cell ferroptosis, DC maturation, and TAM repolarization.
• This dual-targeting strategy holds potential for improving cancer immunotherapy efficacy by overcoming TME-mediated immunosuppression.