Bioengineered Bacterial Membrane Vesicles with Multifunctional Nanoparticles as a Versatile Platform for Cancer...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• Immunogenic cell death (ICD) is crucial for effective cancer immunotherapy.
• Tumor hypoxia and non-specific delivery hinder current immunotherapy strategies.
• Developing targeted, drug-free nanoplatforms is essential to improve treatment efficacy.

Purpose of the Study:

• To develop a bacteria-derived outer membrane vesicle (OMV)-functionalized Fe3O4-MnO2 (FMO) nanoplatform for enhanced cancer immunotherapy.
• To achieve neutrophil-mediated targeted delivery of the nanoplatform to tumor sites.
• To investigate the synergistic effects of ICD induction, hypoxia regulation, and photothermal therapy (PTT) for improved anti-tumor immunity.

Main Methods:

• Fabrication of OMV-functionalized FMO nanoparticles (NPs).
• Evaluation of neutrophil-mediated targeted delivery and tumor accumulation.
• Assessment of FMO NPs' reactive decomposition, ion release, and oxygen generation in the tumor microenvironment.
• Combination therapy involving ICD induction, hypoxia modulation, and photothermal therapy (PTT).

Main Results:

• OMV functionalization facilitated neutrophil-mediated targeted delivery of FMO NPs to tumors.
• FMO NPs induced ICD and generated oxygen, alleviating tumor hypoxia.
• OMVs activated immune cells by overcoming the immunosuppressive tumor microenvironment.
• Combined PTT and OMV-mediated immunotherapy demonstrated significant anti-tumor effects, preventing tumor growth and recurrence.

Conclusions:

• The OMV-functionalized FMO nanoplatform offers a promising drug-free strategy for targeted cancer immunotherapy.
• Neutrophil-mediated delivery, ICD induction, hypoxia regulation, and PTT synergistically enhance anti-tumor immune responses.
• This multi-modal approach holds potential for preventing tumor growth and recurrence.