Temperature-tunable iron oxide nanoparticles for remote-controlled drug release.

Area of Science:

• Biotechnology
• Materials Science
• Nanomedicine

Background:

• Developing targeted drug delivery systems is crucial for improving cancer therapy efficacy and reducing side effects.
• Iron oxide nanoparticles (IONPs) offer potential as drug carriers due to their biocompatibility and magnetic properties.
• Thermoresponsive polymers can enable controlled drug release in response to external stimuli like temperature.

Purpose of the Study:

• To develop a novel nanosystem for efficient, temperature-triggered delivery and release of anticancer drugs specifically for cancer treatment.
• To synthesize and characterize iron oxide nanoparticles (IONPs) coated with a thermoresponsive copolymer (PNAP).
• To evaluate the temperature-tunable drug release profile and in vitro efficacy of the developed nanosystem.

Main Methods:

• Synthesis of monodispersed iron oxide nanoparticles (IONPs) stabilized with tetramethylammonium hydroxide pentahydrate (TMAOH).
• Coating of IONPs with the thermoresponsive copolymer poly-(NIPAM-stat-AAm)-block-PEI (PNAP).
• Characterization using ATR-FTIR and thermogravimetric analysis (TGA); drug loading with doxorubicin (DOX); in vitro drug release studies at varying temperatures; in vitro cytotoxicity and cellular uptake studies.

Main Results:

• Successfully developed water-soluble IONPs (130.1 ± 0.2 nm) coated with PNAP, exhibiting temperature-dependent structural changes for drug release.
• The phase transition temperature of the copolymer was precisely tunable between 36°C-44°C by adjusting the monomer ratio.
• DOX-loaded IONPs-PNAP demonstrated triggered drug release above the copolymer's phase transition temperature, efficient cancer cell internalization, and temperature-dependent therapeutic efficacy with no observed toxicity for drug-free nanoparticles.

Conclusions:

• The developed IONPs-PNAP nanosystem provides an efficient and temperature-tunable platform for targeted anticancer drug delivery.
• The system enables remotely triggered drug release, offering a promising approach for cancer therapy.
• This temperature-responsive delivery system holds significant potential for the eradication of cancer cells.