Nanoparticle-Based Mitochondrial Disruptor Drives Tumor-Selective Pyroptosis for Effective Colorectal Cancer...

Area of Science:

• Biomedical Engineering
• Cancer Research
• Immunology

Background:

• Pyroptosis, an immunogenic programmed cell death, holds potential for cancer immunotherapy.
• Current challenges include achieving tumor-selective and controllable pyroptosis induction.

Purpose of the Study:

• To develop a nanoparticle-based mitochondrial disruptor for intrinsic pyroptosis induction in cancer cells.
• To engineer a system for tumor-selective and pH-responsive activation of pyroptosis.

Main Methods:

• Designed nanoMd/PA, a nanoparticle with a guanidinium-rich shell for mitochondrial membrane disruption and a pH-responsive polymer layer.
• Utilized antimicrobial peptide-inspired design for selective tumor mitochondria accumulation and pore-forming mechanism.
• Tested nanoMd/PA in an orthotopic colorectal cancer model.

Main Results:

• nanoMd/PA selectively destabilized tumor cell mitochondrial membranes, initiating gasdermin-mediated pyroptosis.
• Treatment led to significant tumor suppression, extended survival, and inhibited metastasis in vivo.
• Demonstrated no detectable systemic toxicity.

Conclusions:

• Established a carrier-independent, nanomaterial-driven strategy for inducing pyroptosis via direct mitochondrial membrane disruption.
• Presented a novel paradigm for cancer immunotherapy using synthetic, immunomodulatory nanoparticles.
• Highlighted the potential of nanoMd/PA for activating antitumor immunity.