A CO₂-Responsive Imidazole-Functionalized Fluorescent Material Mediates Cancer Chemotherapy

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Biology

Background:

• Development of stimuli-responsive materials for targeted drug delivery.
• Need for selective and effective anticancer agents with reduced side effects.

Purpose of the Study:

• To synthesize and characterize a novel gas-responsive material (I-R6G) for cancer treatment.
• To investigate the CO2-triggered self-assembly and anticancer properties of I-R6G.

Main Methods:

• Synthesis of a multifunctional material (I-R6G) combining a CO2-sensitive imidazole and rhodamine 6G.
• Characterization of I-R6G's solubility, self-assembly, optical properties, and haemolytic activity.
• In vitro evaluation of I-R6G's cellular uptake, cancer cell death induction, and normal cell viability.

Main Results:

• I-R6G is hydrophobic and weakly fluorescent, becoming water-soluble and fluorescent upon CO2 treatment.
• CO2-induced self-assembly of I-R6G into nanoparticles with unique optical properties and low haemolytic activity.
• CO2-treated I-R6G selectively internalizes into cancer cells, inducing necrotic cell death, while sparing normal cells.

Conclusions:

• The developed I-R6G material demonstrates reversible CO2/N2-dependent switching, enabling controlled nanoparticle formation.
• This gas-responsive system offers a novel and efficient strategy to enhance the selectivity, safety, and efficacy of cancer therapy.