Nanoscale battery cathode materials induce DNA damage in bacteria.

Area of Science:

• Environmental Science
• Nanotoxicology
• Molecular Biology

Background:

• The widespread use of nanoscale lithium nickel manganese cobalt oxide (NMC) in lithium-ion batteries raises environmental concerns.
• Understanding the molecular-level toxicity mechanisms of nanomaterials is crucial for risk assessment and sustainable development.

Purpose of the Study:

• To investigate DNA damage as a primary toxicity mechanism of nano-NMC in bacteria.
• To elucidate the chemical and biological changes associated with nano-NMC-induced DNA damage.

Main Methods:

• Exposure of two environmentally relevant bacterial species to nano-NMC.
• Characterization of DNA damage using molecular techniques, including DNA adductomics.
• Measurement of intracellular reactive oxygen species and transition metal ions using chemical probes.
• Gene expression analysis to complement chemical and biological data.

Main Results:

• Nano-NMC exposure induced significant DNA damage, including double-strand breaks, in both bacterial species.
• Elevated levels of various DNA base modifications were observed, indicating oxidative stress and lipid peroxidation.
• Intracellular reactive oxygen species and transition metal ions were found to be elevated.
• Multi-dimensional data integration revealed mechanistic insights into nano-NMC genotoxicity.

Conclusions:

• Nano-NMC causes DNA damage in bacteria via oxidative stress and metal ion-mediated pathways.
• The findings provide potential biomarkers for risk assessment of reactive nanomaterials.
• This research contributes to understanding nano-bio interactions and promoting the sustainable use of NMC materials.