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Magnetite nanoparticles induced adaptive mechanisms counteract cell death in human pulmonary fibroblasts
Mihaela Radu1, Diana Dinu2, Cornelia Sima3
1Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; Department of Histology, Faculty of Medicine, Pharmacy and Dentistry, Vasile Goldis Western University of Arad, 1 Feleacului, Arad 310396, Romania.
Abstract:
Magnetite nanoparticles (MNP) have attracted great interest for biomedical applications due to their unique chemical and physical properties, but the MNP impact on human health is not fully known. Consequently, our study proposes to highlight the biochemical mechanisms that underline the toxic effects of MNP on a human lung fibroblast cell line (MRC-5). The cytotoxicity generated by MNP in MRC-5 cells was dose and time-dependent. MNP-treated MRC-5 cells accumulated large amount of iron and reactive oxygen species (ROS) and exhibited elevated antioxidant scavenger enzymes. Reduced glutathione (GSH) depletion and enhanced lipid peroxidation (LPO) processes were also observed. The cellular capacity to counteract the oxidative damage was sustained by high levels of heat shock protein 60 (Hsp60), a protein that confers resistance against ROS attack and inhibition of cell death. While significant augmentations in nitric oxide (NO) and prostaglandine E2 (PGE2) levels were detected after 72 h of MNP-exposure only, caspase-1 was activated earlier starting with 24h post-treatment. Taken together, our results suggest that MRC-5 cells have the capacity to develop cell protection mechanisms against MNP. Detailed knowledge of the mechanisms induced by MNP in cell culture could be essential for their prospective use in various in vivo biochemical applications.
Insights
Magnetite nanoparticles (MNP) induce oxidative stress and cell damage in human lung cells, but cells activate protective mechanisms. Further research is needed for safe biomedical applications.
Area of Science:
- Biomedical Engineering
- Nanotoxicology
- Cell Biology
Background:
- Magnetite nanoparticles (MNP) show promise for biomedical uses.
- The health effects of MNP exposure require thorough investigation.
- Understanding MNP toxicity mechanisms is crucial for safe applications.
Purpose of the Study:
- To investigate the biochemical mechanisms of MNP toxicity in human lung fibroblasts (MRC-5).
- To assess the dose- and time-dependent effects of MNP on cell viability and biochemical pathways.
Main Methods:
- Exposure of MRC-5 cells to varying concentrations of MNP over different time points.
- Analysis of cellular iron and reactive oxygen species (ROS) levels.
- Measurement of antioxidant enzymes, glutathione (GSH), lipid peroxidation (LPO), heat shock protein 60 (Hsp60), nitric oxide (NO), prostaglandin E2 (PGE2), and caspase-1 activity.
Main Results:
- MNP exposure caused dose- and time-dependent cytotoxicity in MRC-5 cells.
- Increased intracellular iron, ROS, and elevated antioxidant enzyme activity were observed.
- GSH depletion, enhanced LPO, and increased Hsp60 levels indicated oxidative stress and cellular defense.
- Elevated NO and PGE2 levels and early caspase-1 activation were noted at later time points.
Conclusions:
- MRC-5 cells exhibit protective responses against MNP-induced oxidative stress.
- MNP exposure triggers complex biochemical pathways involving oxidative damage and cellular defense mechanisms.
- Further research into MNP-cell interactions is essential for advancing their in vivo biomedical applications.
