Borrow Strength to Exert: Low-Crystallinity Prussian Blue for Reduction Overload Enhanced Photothermal Therapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• Tumor cells exhibit heightened sensitivity to redox stress due to abnormal metabolism.
• The
• Borrow strength to exert
• strategy from Sun Tzu's Art of War offers a novel approach to cancer treatment.
• Targeting tumor-specific redox vulnerabilities is crucial for effective therapy.

Purpose of the Study:

• To develop a novel therapeutic strategy for cancer treatment inspired by Sun Tzu's
• Borrow strength to exert
• principle.
• To prepare and characterize small-size, low-crystallinity Prussian blue nanoparticles (LcPB NPs) with enhanced therapeutic properties.
• To investigate the efficacy of LcPB NPs in exploiting tumor redox imbalance for cancer therapy.

Main Methods:

• Synthesis of LcPB NPs using chloroauric acid (HAuCl4).
• Evaluation of LcPB NPs' superoxide dismutase (SOD)-like activity and impact on cellular redox balance.
• Assessment of LcPB NPs' efficacy in photothermal therapy (PTT), inhibition of symbiotic bacteria, and disruption of calcium homeostasis.
• Utilizing magnetic resonance imaging (MRI) and photoacoustic imaging (PAI) for tumor diagnosis.

Main Results:

• LcPB NPs demonstrated significantly higher SOD-like activity, inducing redox overload and metabolic disruption in tumor cells.
• Redox imbalance mediated by LcPB NPs led to down-regulation of heat shock proteins (HSPs), enhancing PTT efficacy.
• Tumor growth was effectively inhibited, calcium homeostasis was disrupted, and anticancer effects were improved through symbiotic bacteria inhibition.
• LcPB NPs exhibited excellent magnetic and optical properties for multimodal imaging.

Conclusions:

• LcPB NPs represent a promising nanotherapeutic agent that effectively exploits tumor-specific redox vulnerabilities.
• The developed strategy offers a novel antineoplastic paradigm by leveraging the "borrow strength to exert" principle.
• This approach combines enhanced enzyme-like activity, PTT, and multimodal imaging for comprehensive cancer treatment and diagnosis.