Efficient near-infrared anionic conjugated polyelectrolyte for photothermal therapy.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Conjugated polyelectrolytes offer unique optical and electronic properties.
• Developing efficient and stable photothermal agents is crucial for cancer therapy.
• Anionic polymers can enhance biocompatibility and water solubility.

Purpose of the Study:

• Synthesize and characterize an anionic conjugated polyelectrolyte (PCP-SO3K).
• Evaluate its photothermal conversion efficiency and stability in aqueous solution.
• Investigate its efficacy as a photothermal agent for in vivo cancer treatment.

Main Methods:

• Synthesis of PCP-SO3K with alternating dithiophene and benzene units and sulfonate groups.
• Characterization of optical properties (absorbance, photoluminescence) and photostability.
• In vivo studies using 4T1 tumor-bearing mice with near-infrared laser irradiation.

Main Results:

• PCP-SO3K is water-soluble and photostable with absorbance bands at 490 nm and 837 nm.
• Achieved a high photothermal conversion efficiency of 56.7%.
• Demonstrated complete tumor remission without recurrence in mice post-treatment.

Conclusions:

• Anionic conjugated polyelectrolytes are effective photothermal agents for cancer therapy.
• PCP-SO3K offers a new platform for designing photothermal agents for clinical applications.
• The material's water solubility and NIR-triggered photothermal effect are advantageous for in vivo use.