Visible-light-driven dynamic cancer therapy and imaging using graphitic carbon nitride nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Organic graphitic carbon nitride (g-CN) materials are explored for biomedical applications.
• Photodynamic therapy (PDT) offers a targeted cancer treatment approach.
• Nanoparticles facilitate drug delivery and cellular uptake.

Purpose of the Study:

• To synthesize and characterize organic graphitic carbon nitride nanoparticles (NP-g-CN) for PDT and cell imaging.
• To evaluate the efficacy of NP-g-CN in generating reactive oxygen species (ROS) under visible light.
• To assess the biocompatibility and selective cytotoxicity of NP-g-CN towards cancer cells.

Main Methods:

• NP-g-CN synthesized via intercalation using melamine-cyanuric acid adduct and LiCl-KCl eutectic mixture.
• Particle size characterization confirmed NP-g-CN to be less than 30 nm.
• ROS generation and cancer cell ablation evaluated in HeLa and cos-7 cells under visible light irradiation (λ > 420 nm).

Main Results:

• NP-g-CN demonstrated efficient penetration into malignant tumor cells.
• Significant ROS generation was observed upon visible light irradiation, leading to cancer cell death.
• NP-g-CN exhibited selective cytotoxicity, damaging cancer cells more than normal cells at low concentrations.
• NP-g-CN showed good biocompatibility with lower cytotoxicity compared to inorganic nanomaterials.

Conclusions:

• Synthesized NP-g-CN are effective for photodynamic therapy and cell imaging.
• The nanoparticles' ability to generate ROS under visible light and their biocompatibility are key advantages.
• NP-g-CN represent a promising non-toxic organic nanomaterial for biomedical applications.