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Co3O4 nanoparticles at sublethal concentrations inhibit cell growth by impairing mitochondrial function
Honggang Wang1, Tongtong Ren2, Nali Zhu2
1National Experimental Teaching Demonstration Center of Biology, Nankai University, Tianjin, 300071, PR China.
Biochemical and Biophysical Research Communications
|October 9, 2018
Summary
Cobalt oxide (Co3O4) nanoparticles inhibit mammalian cell growth by disrupting mitochondrial function, not by causing cell death or reactive oxygen species accumulation. This reveals a novel toxicity pathway for these nanomaterials.
Area of Science:
- Nanomaterial toxicology
- Cell biology
- Mitochondrial function
Background:
- Cobalt oxide (Co3O4) nanoparticles (NPs) are widely used in catalysis, electronics, and sensors.
- The biological effects and toxicity mechanisms of Co3O4 NPs require further investigation.
Purpose of the Study:
- To investigate the effects of Co3O4 NPs on mammalian cell growth.
- To elucidate the underlying toxicity mechanisms of Co3O4 NPs.
Main Methods:
- Synthesis and characterization of Co3O4 NPs (15-30 nm).
- Cell viability assays and reactive oxygen species (ROS) detection.
- Transcriptional profiling, transmission electron microscopy (TEM), and biochemical analyses.
Main Results:
- Co3O4 NPs inhibited mammalian cell growth at sublethal concentrations (12.5-200 mg/L) without significant cell death or ROS accumulation.
- Gene expression analysis indicated downregulation of mitochondrial function-related genes.
- TEM and biochemical data suggested NP interaction with mitochondria, impairing mitochondrial membrane potential (MMP) and ATP production.
Conclusions:
- Co3O4 NPs exhibit toxicity through a mechanism linked to the mitochondrial respiratory chain.
- This toxicity is independent of apoptosis, necrosis, and ROS accumulation.
- The findings reveal a novel ROS-independent toxicity pathway for Co3O4 NPs in eukaryotic cells.
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