Temperature-dependent shape-responsive fluorescent nanospheres for image-guided drug delivery

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Hyperthermia combined with temperature-responsive nanoparticles offers synergistic effects for improved drug efficacy.
• In vivo tracking of nanoparticles is crucial for understanding drug delivery mechanisms.
• Developing smart nanomaterials that respond to thermal stimuli is a key area in nanomedicine.

Purpose of the Study:

• To develop a near-infrared (NIR) fluorescent nanoparticle system for in vivo tracking.
• To integrate an upper critical solution temperature (UCST) polymer (ISP2) with a NIR fluorescent dye (HITC).
• To characterize the temperature-dependent size changes of the developed nanospheres.

Main Methods:

• Synthesis of temperature-responsive nanoparticles using ISP2 polymer.
• Incorporation of HITC NIR fluorescent dye for tracking.
• Measurement of nanoparticle size changes across a temperature range (40°C to 60°C).

Main Results:

• The developed system forms nanoparticles with temperature-responsive volume expansion.
• Nanoparticle size nearly doubled, increasing from 80 nm to 140 nm.
• The observed size increase mimics the expansion of a Hoberman sphere.

Conclusions:

• The proposed NIR fluorescent nanoparticle system demonstrates significant, controllable size changes with temperature.
• This system holds promise for enhanced in vivo tracking in hyperthermia-based drug delivery.
• The temperature-responsive nature of these nanoparticles can be leveraged for synergistic therapeutic effects.