Temperature-sensitive fluorescent organic nanoparticles with aggregation-induced emission for long-term cellular...

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Biomedical Imaging

Background:

• Aggregation-induced emission (AIE) materials offer unique optical properties.
• Stimuli-responsive polymers are crucial for advanced material design.
• Cellular imaging requires stable and non-toxic tracking agents.

Purpose of the Study:

• To synthesize and characterize temperature-sensitive organic nanoparticles with AIE properties.
• To investigate the temperature-dependent behavior of these nanoparticles.
• To evaluate their potential as long-term tracers in live cells.

Main Methods:

• Synthesis of tetraphenylethene-based poly(N-isopropylacrylamide) (TPE-PNIPAM) via atom transfer radical polymerization (ATRP).
• Assembly of nanoparticles in aqueous solution.
• Characterization of nanoparticle size and fluorescence properties as a function of temperature.
• Cellular uptake studies using HeLa cells and long-term cell tracing experiments.

Main Results:

• TPE-PNIPAM nanoparticles were successfully synthesized and assembled in water.
• Nanoparticle size and fluorescence intensity were tunable with temperature changes.
• HeLa cells readily internalized the nanoparticles.
• The nanoparticles demonstrated stable retention in live cells for up to seven passages, indicating long-term traceability.

Conclusions:

• Temperature-sensitive AIE nanoparticles based on TPE-PNIPAM are effective for tunable optical properties.
• These nanoparticles exhibit excellent biocompatibility and cellular uptake.
• The developed nanoparticles show significant promise as robust, long-term tracers for live-cell imaging applications.