Journal
JOURNAL OF MOLECULAR RECOGNITION
Volume 32, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/jmr.2804
Keywords
comet assay; DNA damage; nanoplastics; spectral analysis; superoxide dismutase
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Funding
- China Postdoctoral Science Foundation [2018M640631]
- Fundamental Research Funds of Shandong University [2018JC059]
- Natural Science Foundation of Shandong Province, China [ZR2019BB049]
- Guangzhou Key Laboratory of Environmental Exposure and Health [GDKLEEH201805]
- National Natural Science Foundation of China [21507071]
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Microplastic pollution attracted extensive attention because of its global presence and adverse effects on ecosystem. However, it is insufficient to clear the effects of nanoplastics on organisms at the molecular level. Herein, a nanopolystyrene (50 nm) was used to examine molecular responses of superoxide dismutase (SOD) and desoxyribonucleic acid (DNA) using spectroscopy (UV-vis, circular dichroism spectra, and fluorescence measurements) and single cell gel electrophoresis methods. Results showed that nanopolystyrene induced oxidative stress, involving in the increase of SOD activity and malondialdehide (MDA) content, and DNA damage because of the significant increase of olive tail moment, head optical density, and tail DNA percentage in the groups at exposure concentrations above 5 x 10(-6) mol/L. The second structural and microenvironment of aromatic amino acids of SOD were changed with nanopolystyrene exposure. The fluorescence of SOD was quenched by nanopolystyrene at exposure concentration above 1 x 10(-5) mol/L, and the quenching mode could be ascribed to the static type. The results and the combined methods are favorable to explore the molecular toxicity of other nanoplastics and the interaction mechanism.
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