Precise In Situ Delivery of a Photo-Enhanceable Inflammasome-Activating Nanovaccine Activates Anticancer Immunity

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Immunotherapy

Background:

• Solid tumors exhibit immunosuppression in the tumor microenvironment (TME), limiting nanovaccine (NV) and immunotherapy efficacy.
• Enhancing antigen cross-presentation and modulating the TME are crucial for improving NV activity.

Purpose of the Study:

• To develop photo-enhanceable inflammasome-activating nanovaccines (PIN) for precise in situ delivery of tumor antigens and immune modulators.
• To investigate the potential of PIN to overcome TME-mediated immunosuppression and enhance cancer immunotherapy.

Main Methods:

• PIN nanoparticles were engineered to deliver tumor antigens and activate the NLRP3 inflammasome pathway.
• Near-infrared light irradiation was used to trigger PIN accumulation and activation at tumor sites.
• Antigen cross-presentation, cytokine production, and antitumor immune responses were assessed in vivo.

Main Results:

• Near-infrared light irradiation enhanced PIN accumulation and triggered intratumoral NLRP3 inflammasome activation and antigen cross-presentation.
• PIN treatment promoted proinflammatory cytokine production and activated antitumor immunity with minimal systemic toxicity.
• PIN significantly enhanced the efficacy of immune checkpoint blockade and established long-term immune memory in melanoma and hepatocellular carcinoma models.

Conclusions:

• PIN represents a safe and efficient photoresponsive system for co-delivering antigens and immune modulators.
• This nanovaccine strategy demonstrates potential for robust TME modulation and enhanced cancer immunotherapy.
• The developed photoresponsive nanovaccine offers a promising therapeutic strategy for cancer treatment.