Polymer colloidal motors with photodynamic-regulated propulsion

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Artificial colloidal motors convert energy into motion, showing potential as photosensitizer (PS) nanocarriers for photodynamic therapy (PDT).
• Efficient conversion of singlet oxygen (¹O₂) generation for autonomous transport in PDT remains a challenge.

Purpose of the Study:

• To develop PS-loaded semiconducting conjugated polymer (SCP)-based colloidal motors with asymmetric geometry for photodynamic-regulated propulsion.
• To investigate the mechanism of light-activated propulsion and its potential for enhancing PDT efficacy.

Main Methods:

• Fabrication of asymmetric colloidal motors incorporating PS-loaded SCPs.
• Investigation of light-induced singlet oxygen generation and release dynamics.
• Analysis of self-propelled motion driven by osmotic pressure gradients and photothermal effects.
• Evaluation of nanocarrier permeability across physiological barriers and antitumor efficacy in a tumor microenvironment.

Main Results:

• Asymmetric SCP distribution within motors induced differential ¹O₂ generation and release, creating osmotic pressure gradients for photodynamic propulsion.
• Combined photodynamic and photothermal effects generated dual energy gradients, enabling multimode synergistic propulsion.
• Light-driven nanocarriers demonstrated enhanced permeability through physiological barriers.
• Improved antitumor efficacy was observed in the tumor microenvironment.

Conclusions:

• Asymmetric SCP-based colloidal motors offer a novel platform for light-activated autonomous transport in PDT.
• The developed motors exhibit efficient photodynamic and photothermal propulsion, enhancing drug delivery and therapeutic outcomes.
• These findings highlight the potential of engineered colloidal motors for advanced cancer phototherapy.