Subchronic Graphene Exposure Reshapes Skin Cell Metabolism

Area of Science:

• Nanomaterials Science
• Toxicology
• Cell Biology

Background:

• Graphene-related materials (GRMs) are increasingly studied for safety.
• Subchronic exposure to GRMs via human barriers like skin is common in applications.
• Understanding GRM toxicity is crucial for safe use.

Purpose of the Study:

• To investigate the subchronic (30-day) effects of three GRMs (GO 1, GO 2, FLG) on human skin cells (HaCaTs).
• To determine how varying oxidation degrees, sizes, and manufacturing methods of GRMs influence cellular responses.
• To identify specific GRMs that induce adverse effects on cell metabolism and behavior.

Main Methods:

• Subchronic exposure model (30 days) using three distinct GRMs.
• Assay of GRM effects on HaCaT cells using high-throughput metabolic profiling.
• Inclusion of additional cell-based assays to complement metabolic data.

Main Results:

• Differential toxicity observed among the tested GRMs.
• GO 2 induced significant metabolic remodeling in epithelial cells, including increased tricarboxylic acid cycle components.
• Metabolic changes were correlated with increased cell proliferation and altered cell phenotype.

Conclusions:

• GRM oxidation degree, size, and manufacturing method significantly influence their toxicological impact.
• Nontoxic exposures to certain GRMs can lead to harmful effects on cell metabolism and behavior.
• A "safe by design" strategy is essential for developing and utilizing GRMs safely.