Design of a Trigger-Responsive Photothermal Vesicle-Based Cargo Delivery Platform

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Current drug delivery systems lack precise control over therapeutic agent release, leading to reduced efficacy and increased side effects.
• Targeted delivery and controlled release are crucial for enhancing therapeutic outcomes and minimizing systemic toxicity.

Purpose of the Study:

• To develop a photothermal trigger-responsive cargo delivery platform using Giant Unilamellar Vesicles (GUVs) functionalized with gold nanorods (GNRs).
• To achieve precise, light-mediated control over the timing and efficiency of therapeutic agent release.

Main Methods:

• Giant Unilamellar Vesicles (GUVs) were loaded with cargo and functionalized with cholesterol-modified gold nanorods (GNRs) via the emulsion transfer method.
• Near-infrared (NIR) light was used to trigger cargo release through photothermal heating mediated by the GNRs.
• The efficiency of GNR attachment and cargo release was optimized by adjusting cholesterol concentration.

Main Results:

• Optimized cholesterol concentration on GNRs ensured effective attachment to GUV membranes and high cargo release efficiency upon NIR irradiation.
• Functional GNR-functionalized, ampicillin-loaded GUVs demonstrated inhibited bacterial growth in the presence of E. coli after NIR-triggered release.
• GNRs alone exhibited antibacterial activity through photothermal heating, suggesting a dual-action mechanism.

Conclusions:

• The developed GUV-GNR platform provides a versatile, biocompatible, and trigger-responsive system for controlled drug delivery.
• This technology holds significant potential for targeted therapeutics, diagnostics, and various biomedical applications requiring precise release mechanisms.