Exploring graphene-based materials' genotoxicity: inputs of a screening method.

Area of Science:

• Nanomaterial safety assessment
• Toxicology and hazard identification
• Biomedical engineering

Background:

• Graphene-based materials (GBMs) are advanced nanomaterials with significant innovation potential.
• Assessing the potential hazards of GBMs is crucial before market entry.
• GBMs are known to cause biological impacts, including oxidative stress and potential DNA damage, but genotoxicity data is conflicting.

Purpose of the Study:

• To evaluate the genotoxicity of 13 GBMs, carbon black, and amorphous silica.
• To investigate the relationship between physicochemical properties, oxidative stress, and genotoxicity.
• To establish structure-activity relationships for GBM genotoxicity.

Main Methods:

• Genotoxicity assessed using a DNA damage response assay in human respiratory (BEAS-2B) cells.
• Oxidative stress evaluated via reactive oxygen species (ROS) production in murine macrophage (RAW 264.7) cells.
• Comprehensive physicochemical characterization of all tested nanomaterials.

Main Results:

• Genotoxicity varied significantly among the tested GBMs.
• Surface oxidation of GBMs was identified as a factor linked to genotoxicity.
• Distinct groups of GBMs exhibited different genotoxicity profiles and potential modes of action.

Conclusions:

• Each nanoform of GBMs must be assessed individually due to diverse genotoxicity results and mechanisms.
• The study proposes a high-throughput screening method for GBM genotoxicity assessment.
• Hypotheses regarding the genotoxicity mechanisms of GBMs are suggested for future research.