Photothermally Controlled Methotrexate Release System Using β-Cyclodextrin and Gold Nanoparticles.

Area of Science:

• Nanotechnology
• Materials Science
• Pharmacology

Background:

• Methotrexate (MTX) is an effective antitumor drug with limited solubility and significant toxicity.
• Cyclodextrins (CDs) can form inclusion compounds (ICs) to enhance drug solubility and reduce side effects.
• Gold nanoparticles (AuNPs) possess unique plasmonic properties suitable for targeted drug delivery systems.

Purpose of the Study:

• To create a ternary intelligent delivery system for Methotrexate (MTX) using cyclodextrin (CD) and gold nanoparticles (AuNPs).
• To investigate the controlled release of MTX from the system upon laser irradiation.
• To evaluate the efficacy of the system in reducing HeLa tumor cell viability.

Main Methods:

• Formation of a cyclodextrin-Methotrexate inclusion compound (CD/MTX).
• Conjugation of the CD/MTX IC with gold nanoparticles (AuNPs) to form a ternary system.
• Controlled release of MTX induced by laser irradiation tuned to AuNPs' surface plasmon resonance.
• Assessment of cell viability using MTS assays on HeLa tumor cells.

Main Results:

• The ternary system AuNPs + β-CD/MTX was successfully synthesized.
• Laser irradiation of the ternary system induced photothermal release of MTX.
• The irradiated ternary system significantly reduced HeLa tumor cell viability compared to controls.
• This reduction in cell viability was attributed to the photothermally released MTX.

Conclusions:

• The developed ternary system (AuNPs + β-CD/MTX) represents a promising intelligent drug delivery platform for Methotrexate.
• Photothermal release triggered by laser irradiation offers a controlled method for drug delivery, enhancing therapeutic efficacy.
• This approach has the potential to improve Methotrexate's therapeutic index by targeting drug release and minimizing systemic toxicity.