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Microarray-assisted size-effect study of amorphous silica nanoparticles on human bronchial epithelial cells.
Yang Li1, Junchao Duan1, Xiangyuan Chai2
1School of Public Health, Beijing, 100069, China and Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing, 100069, China. zwsun@ccmu.edu.cn ruichen@ccmu.edu.cn.
Nanoscale
|November 26, 2019
Summary
Smaller amorphous silica nanoparticles (SiNPs) cause greater gene expression changes, impacting immune response and cell stress pathways. This research clarifies size-dependent toxicity mechanisms for SiNPs, crucial for safety assessments.
Area of Science:
- Nanomaterial toxicology
- Environmental health
- Molecular biology
Background:
- Amorphous silica nanoparticles (SiNPs) are widely used engineering nanomaterials.
- Respiratory exposure is a primary human exposure route for SiNPs.
- The size-dependent toxicity and mechanisms of SiNPs remain unclear.
Purpose of the Study:
- Investigate genome-wide transcriptional alterations induced by different sizes of SiNPs.
- Clarify the size-dependent toxicity mechanisms of SiNPs in human bronchial epithelial cells.
- Provide data for the toxicity and safety evaluation of SiNPs.
Main Methods:
- Microarray analysis of human primary bronchial epithelial cells (BEAS-2B).
- Exposure to SiNPs of varying sizes (41 nm, 61 nm, and 206 nm).
- Bioinformatics analysis of differentially expressed genes and affected pathways.
Main Results:
- Gene expression alterations increased as SiNP size decreased.
- Genes related to immune response, inflammation, ER stress, and oxidative stress were upregulated with decreasing particle size.
- Genes involved in respiratory system development were downregulated with decreasing particle size.
- SiNP toxicity mechanisms involved cell entry, autophagy, ER stress, inflammation, DNA damage, and cancer pathways.
Conclusions:
- Particle size significantly influences SiNP-induced transcriptional changes and toxicity.
- This study provides novel insights into the size-dependent toxic mechanisms of SiNPs.
- Findings support the development of safety guidelines for SiNP applications.
