Photodegradable polyurethane self-assembled nanoparticles for photocontrollable release

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Light-responsive drug delivery systems offer precise control over drug release at specific sites and rates.
• Developing stable yet triggerable nanoparticles is crucial for effective intracellular drug delivery.

Purpose of the Study:

• To synthesize and characterize novel photodegradable polymers for nanoparticle formation.
• To evaluate the light-triggered drug release capabilities and cellular uptake of these nanoparticles.
• To assess the safety and efficacy of the system using a model drug in cancer cells.

Main Methods:

• Synthesis of photodegradable polymers capable of forming nanoparticles.
• Stability testing in various pH and temperature conditions.
• Quantification of drug release using Nile red fluorescence.
• Cellular uptake and intracellular release studies using fluorescence microscopy.
• Cytotoxicity assays before and after light irradiation.
• Encapsulation and release of Tagalsin G in RAW 264.7 cells.

Main Results:

• Nanoparticles exhibited stability in different pH and temperatures.
• Light irradiation triggered rapid nanoparticle degradation and substance release (up to 90% in 15 min).
• Successful cellular uptake and light-induced intracellular drug release were observed.
• Nanoparticles showed no significant toxicity up to 1000 μg/mL.
• Light-triggered release of Tagalsin G significantly increased cancer cell death (from 9% to 67%).

Conclusions:

• Photodegradable nanoparticles represent a viable platform for controlled drug delivery.
• Light-triggered intracellular drug release is an effective strategy for enhancing therapeutic outcomes.
• This system shows significant promise for targeted cancer therapy with minimal toxicity.