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Multi-Organelle Stress-Induced Paraptosis by a ROS-Amplifying Nanocatalyst for Enhanced Cancer Immunotherapy.

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This study introduces a novel iron-based nanodrug that enhances chemodynamic therapy (CDT) by triggering paraptosis, an unconventional cell death pathway. This approach overcomes limitations in hydrogen peroxide (H2O2) and apoptosis resistance, boosting antitumor immunity.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cancer Therapy

Background:

  • Chemodynamic therapy (CDT) faces challenges due to insufficient intracellular hydrogen peroxide (H2O2) and resistance to apoptosis.
  • Developing novel strategies to enhance CDT efficacy and overcome treatment resistance is crucial for cancer therapy.

Purpose of the Study:

  • To engineer a nanoplatform that self-supplies H2O2 and blocks autophagic flux to potentiate CDT.
  • To investigate the induction of paraptosis as a novel cell death pathway for cancer treatment.
  • To evaluate the synergistic effects of the nanoplatform with immunotherapy.

Main Methods:

  • Fabrication of a porous Fe3O4 nanoplatform loaded with carbonyl cyanide 3-chlorophenylhydrazone (CCCP) and lactate oxidase (LOD).
  • In vitro and in vivo evaluation of the nanoplatform's ability to generate H2O2, induce oxidative stress, and trigger paraptotic cell death.
  • Assessment of the nanoplatform's immunogenic cell death and combination therapy with αPD-L1 for enhanced antitumor immunity.

Main Results:

  • The nanoplatform effectively released Fe ions and generated H2O2 in the tumor microenvironment, overcoming the H2O2 deficiency.
  • CCCP-mediated mitochondrial uncoupling amplified reactive oxygen species (ROS) leakage, leading to multi-organelle stress and paraptosis.
  • The combination therapy demonstrated potent activation of antitumor immunity and significant suppression of primary and distant tumors.

Conclusions:

  • The developed iron-based nanodrug effectively triggers paraptosis, offering a new strategy to enhance CDT efficacy.
  • Multi-organelle stress synergy and paraptosis induction represent a promising approach for overcoming cancer treatment resistance.
  • This nanoplatform holds potential for combination therapy, significantly improving immunotherapy outcomes in cancer treatment.