Programmable DNAzyme nanocatalysts orchestrate redox-immune coupling for time-gated cancer immunomodulation

Area of Science:

• Nanobiotechnology
• Cancer Immunotherapy
• Redox Signaling

Background:

• Tumor immune activation relies on dynamic redox and mitochondrial signaling, but their temporal control is poorly understood.
• Current cancer immunotherapies lack precise temporal regulation of immune responses.
• Targeting intracellular signaling pathways offers potential for novel therapeutic strategies.

Purpose of the Study:

• To develop a programmable DNAzyme nanocatalyst for time-dependent redox-immune coupling.
• To create a transient biochemical signal window for enhanced cancer immunotherapy.
• To investigate the potential of DNAzyme-based nanocatalysts in dynamic cancer treatment.

Main Methods:

• Designed a programmable DNAzyme nanocatalyst (APTZ) integrating ZnO nanoparticles, a catalase-targeting DNAzyme, and a tumor-homing aptamer.
• APTZ utilizes acid-triggered Zn2+ release to cleave catalase mRNA, amplifying reactive oxygen species and depleting glutathione.
• Monitored mitochondrial dysfunction, mtDNA release, cGAS-STING pathway activation, and type I interferon response.

Main Results:

• APTZ established a transient 4-6 hour redox sensitization window by inducing mitochondrial dysfunction and mtDNA leakage.
• This window activated the cGAS-STING pathway and type I interferon response, priming the tumor microenvironment.
• Applying immune checkpoint blockade within the sensitization window significantly enhanced dendritic cell maturation and cytotoxic T-cell infiltration.

Conclusions:

• Programmable DNAzyme catalysis can generate actionable temporal biochemical cues for precise immune modulation.
• The APTZ platform provides a nanobiotechnology framework for time-guided innate immune responses in cancer.
• DNAzyme-based nanocatalysts hold significant promise for advancing dynamic cancer immunotherapy strategies.