Journal
BIOLOGICAL TRACE ELEMENT RESEARCH
Volume 189, Issue 2, Pages 478-489Publisher
SPRINGERNATURE
DOI: 10.1007/s12011-018-1477-9
Keywords
Nanometer zinc oxide; Sub-chronic toxicity; LOAEL; Target organs
Funding
- National Natural Science Foundation of China [31402263, 41301562]
- China Scholarship Council [201608410282]
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Nanometer zinc oxide (nano-ZnO) is widely used in many kinds of fields. However, information about the toxicity and toxic mechanism of nano-ZnO is limited. The aims of this study were to investigate the long-term toxic effects of unmodified 50nm ZnO administered by gavage in mice. After 90days, hematological parameters, hepatic and renal functions, and oxidative and anti-oxidative status were measured. Pathological damages in livers, kidneys, and other tissues were also examined by hematoxylin and eosin (H&E) staining. The results showed that oral nano-ZnO exposure induced anemia and damages to liver and kidney, influenced the antioxidant system, and impacted functions of liver and kidney in mice after a 90-day exposure. The main cause for oxidative stress in vivo induced by nano-ZnO might be hydroxyl free radical. The lowest observed adverse effect level (LOAEL) was 40mg/kgbw, and the livers, kidneys, lungs, pancreas, and gastrointestinal tracts are the target organs.
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