Metal-Polyphenol Self-Assembled Nanophotothermal Agent for Precise Mitochondrial Targeted Photothermal Therapy.

Area of Science:

• Biomedical Engineering
• Materials Science
• Oncology

Background:

• Nanocarriers enhance photothermal agent delivery but face challenges in safety, loading capacity, and preparation complexity.
• Existing tumor treatments often lack specificity and efficiency.

Purpose of the Study:

• To develop an acid-responsive, multifunctional nanophotothermal agent for improved cancer therapy.
• To overcome limitations of current nanocarrier-based photothermal agents.

Main Methods:

• Synthesized TF@IR780 (TR) by encapsulating IR780 within a self-assembled tannic acid-Fe3+ (TA-Fe3+) network.
• Investigated acid-triggered release of IR780 in the tumor microenvironment (TME).
• Evaluated TR's multimodal imaging (MRI and fluorescence) and photothermal therapeutic capabilities.

Main Results:

• The TA-Fe3+ (TF) shell enhanced IR780 stability, solubility, and tumor cell uptake.
• TR demonstrated acid-responsive drug release in the slightly acidic TME.
• TR exhibited multimodal imaging and precise, light-regulated mitochondrial damage for effective antitumor activity.

Conclusions:

• The developed TR nanophotothermal agent offers improved in vivo stability and targeted delivery.
• TR provides multimodal imaging and controllable photothermal therapy with enhanced specificity.
• This approach presents a promising strategy for overcoming traditional cancer treatment drawbacks.