book_cover_img The Korean Society of Marine Life Science Journal of Marine Life Science eISSN 2508-7134
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Year of Launching : 2016
Frequency : Twice a year (June 15, December 15)
Doi Prefix : 10.23005/ksmls.

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ISSN : 2508-7134(Online)
Journal of Marine Life Science Vol.6 No.1 pp.31-37
DOI :

Ingestion of Polystyrene Microplastics Acutely Induces Oxidative Stress in the Marine Medaka Oryzias javanicus

Sang-Eun Nam1, Jee-Hyun Jung2, Jae-Sung Rhee1,3,4*
1Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 22012, Korea
2Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje 53201, Korea
3Research Institute of Basic Sciences, Incheon National University, Incheon 22012, Korea
4Institute of Green Environmental Research Center, Incheon 21999, Korea

Corresponding Author Jae-Sung Rhee Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon 22012, Korea E-mail : jsrhee@inu.ac.kr

Abstract

Larvae from the marine medaka fish Oryzias javanicus were exposed with polystyrene microplastics (MPs) for 24 h. Exposure to waterborne fluorescent MPs showed clear ingestion and egestion in feces. Under constant MPs, the concentration of dissolved oxygen significantly decreased in 24 h compared to the control. Significant intracellular reactive oxygen species and malondialdehyde contents were detected in larvae, indicating oxidative stress and lipid peroxidation. Significant elevations in mRNA expressions of heat shock protein 70 and antioxidant defense system genes (glutathione reductase, glutathione peroxidase, catalase, and superoxide dismutase) were measured with increases in enzymatic activity of oxidative stress-related proteins. Taken together, the alterations to the molecular and biochemical components suggested that waterborne MPs had an oxidative stress effect on marine medaka larvae.

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