A morphologically transformable hypoxia-induced radical anion for tumor-specific photothermal therapy

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cancer Therapeutics

Background:

• Selective tumor treatment requires therapeutic agents that activate within the tumor microenvironment and accumulate effectively.
• Developing such agents is crucial for enhancing treatment efficacy and minimizing off-target effects.

Purpose of the Study:

• To design and synthesize a novel perylene diimide (PDI) based nanomaterial (PDI-SG) that is activatable by the tumor microenvironment.
• To evaluate the PDI-SG nanomaterial's self-assembly, morphological transformation, tumor accumulation, and photothermal ablation capabilities for cancer therapy.

Main Methods:

• Synthesis of glutamic acid-substituted perylene diimide (PDI-SG) nanoparticles.
• Investigation of pH-triggered morphological transformation from nanoparticles to nanofibers.
• Assessment of PDI-SG reduction to PDI radical anion (PDI·−) in hypoxic conditions.
• Evaluation of near-infrared absorption and photothermal performance.
• In vitro and in vivo studies on tumor accumulation and ablation.

Main Results:

• PDI-SG self-assembles into spherical nanoparticles in aqueous solution and transforms into nanofibers under low pH conditions.
• PDI-SG is reduced to PDI·− in hypoxic tumors, exhibiting strong near-infrared absorption and excellent photothermal performance.
• Morphological transformation enhances tumor accumulation and retention, leading to effective tumor ablation.
• The nanomaterial demonstrates selective tumor treatment with minimized damage to normal tissues.

Conclusions:

• The perylene diimide-based nanomaterial (PDI-SG) is a tumor microenvironment activatable therapeutic agent.
• Its unique structural transformation and reduction properties facilitate enhanced tumor accumulation and photothermal ablation.
• This study presents a promising strategy for designing advanced nanotherapeutics for high-performance cancer treatment.