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Hepatotoxicity assessment of Mn-doped ZnS quantum dots after repeated administration in mice

Authors Yang YJ, Lv SY, Yu BF, Xu S, Shen JM, Zhao T, Zhang HX

Received 18 May 2015

Accepted for publication 6 July 2015

Published 15 September 2015 Volume 2015:10(1) Pages 5787—5796

DOI https://doi.org/10.2147/IJN.S88789

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Farooq Shiekh

Peer reviewer comments 3

Editor who approved publication: Dr Lei Yang

Yanjie Yang,1,2 Shuang-Yu Lv,2 Bianfei Yu,1 Shuang Xu,1 Jianmin Shen,3 Tong Zhao,1 Haixia Zhang1

1Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University, Lanzhou, Gansu, 2School of Medicine, Henan University, Kaifeng, Henan, 3Institute of Biochemistry and Molecular Biology, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, People’s Republic of China

Abstract: Doped ZnS quantum dots (QDs) have a longer dopant emission lifetime and potentially lower cytotoxicity compared to other doped QDs. The liver is the key organ for clearance and detoxification of xenobiotics by phagocytosis and metabolism. The present study was designed to synthesize and evaluate the hepatotoxicity of Mn-doped ZnS QDs and their polyethylene glycol-coated counterparts (1 mg/kg and 5 mg/kg) in mice. The results demonstrated that daily injection of Mn-doped ZnS QDs and polyethylene glycol-coated QDs via tail vein for 7 days did not influence body weight, relative liver weight, serum aminotransferases (alanine aminotransferase and aspartate aminotransferase), the levels of antioxidant enzymes (catalase, glutathione peroxidase, and superoxide dismutase), or malondialdehyde in the liver. Analysis of hepatocyte ultrastructure showed that Mn-doped ZnS QDs and polyethylene glycol-coated QDs mainly accumulated in mitochondria at 24 hours after repeated intravenous injection. No damage to cell nuclei or mitochondria was observed with either of the QDs. Our results indicate that Mn-doped ZnS QDs did not cause obvious damage to the liver. This study will assist in the development of Mn-doped ZnS QDs-based bioimaging and biomedical applications in the future.

Keywords: liver, serum aminotransferases, antioxidant enzymes, ultrastructure

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