Hydrangea-structured tumor microenvironment responsive degradable nanoplatform for hypoxic tumor multimodal imaging...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Oncology

Background:

• Tumor hypoxia significantly hinders effective cancer therapy.
• Developing strategies to alleviate tumor hypoxia is crucial for improving treatment outcomes.
• Existing therapies often face challenges due to the complex tumor microenvironment (TME).

Purpose of the Study:

• To design and evaluate a novel TME-responsive nanoplatform for synergistic chemo/photodynamic/photothermal therapy.
• To overcome tumor hypoxia by developing an oxygen-generating system.
• To enhance the therapeutic efficacy against solid tumors.

Main Methods:

• Co-loading an aza-BODIPY photosensitizer and doxorubicin (DOX) onto hydrangea-structured MnO2 nanoparticles.
• Establishing a TME-responsive degradable nanoplatform (MDSP NP) for oxygen generation.
• Utilizing in vivo fluorescence, photoacoustic, and photothermal imaging for evaluation.

Main Results:

• MDSP NPs (∼54 nm) exhibit near-infrared absorption (∼853 nm) and generate oxygen in response to TME, alleviating hypoxia.
• MDSP NPs preferentially accumulate at tumor sites and induce hyperthermia, enhancing drug uptake and reducing resistance.
• Demonstrated synergistic chemo/photodynamic/photothermal therapy with significant therapeutic effects in vitro and in vivo.

Conclusions:

• The developed hydrangea-structured, TME-responsive nanoplatform effectively addresses tumor hypoxia.
• MDSP NPs offer a promising strategy for synergistic cancer therapy, improving treatment efficiency.
• This approach holds great potential for clinical applications in treating hypoxic solid tumors.