Photocontrolled nanoparticle delivery systems for biomedical applications

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Stimuli-responsive nanomaterials enable controlled release of therapeutic agents.
• Light offers noninvasive, spatiotemporal control for targeted delivery of bioactive molecules.
• Current limitations include reliance on UV/visible light and penetration depth issues in tissues.

Purpose of the Study:

• To review light-based nanoparticle delivery systems.
• To discuss applications, limitations, and emerging technologies.
• To highlight advancements in overcoming challenges for improved biomedical applications.

Main Methods:

• Classification of light-based delivery strategies: photolabile "caging", photoresponsive nanocarriers, and plasmon resonance of nanoparticles.
• Exploration of nanomaterials with upconversion or two-photon-excitation properties for NIR light conversion.
• Review of strategies utilizing photothermal transduction from materials like metal sulfides and graphene oxide.

Main Results:

• Three primary strategies for light-triggered release: caged molecule activation, nanocarrier dissociation, and plasmon-enhanced release.
• Development of nanotransducers to convert near-infrared (NIR) light to UV/visible light for activating photoresponsive moieties.
• Identification of limitations associated with UV/visible light sensitivity and the need for deeper tissue penetration.

Conclusions:

• Light-based nanomaterial systems offer significant potential for targeted drug delivery in biomedical applications.
• Overcoming limitations of UV/visible light sensitivity and penetration depth is crucial for clinical translation.
• Emerging technologies utilizing NIR light and advanced nanotransducers promise enhanced efficacy and safety.