Age-dependent survival, stress defense, and AMPK in Daphnia pulex after short-term exposure to a polystyrene nanoplastic

Aquatic Toxicology
Zhiquan LiuYunlong Zhao

Abstract

The widespread occurrence and accumulation of micro- and nanoplastics in aquatic environments has become a growing global concern. Generally, natural aquatic populations are characterized by a variety of multi-structured age groups, for which physiological and biochemical responses typically differ. The freshwater cladoceran, Daphnia pulex, is a model species used extensively in environmental monitoring studies and ecotoxicology testing. Here, the effects of a polystyrene nanoplastic on the physiological changes (i.e., survival) and expression levels of stress defense genes (i.e., those encoding antioxidant-mediated and heat shock proteins) in this freshwater flea were measured. Results from acute bioassays were used to determine the respective nanoplastic LC50 values for five age groups (1-, 4-, 7-, 14- and 21-day-old individuals): the obtained values for the 1- and 21-day-old D. pulex groups were similar (i.e., not significantly different). The expression levels of genes encoding key stress defense enzymes and proteins-SOD, CAT, GST, GPx, HSP70, and HSP90-were influenced by the nanoplastic in all the age groups, but not in the same way for each. Significant differences were observed among all age groups in their expression of...Continue Reading

Citations

Sep 3, 2020·Environmental Science and Pollution Research International·Siva Sankar SanaNalluri Abhishek
Mar 1, 2020·International Journal of Environmental Research and Public Health·Cheryl Qian Ying YongBor Luen Tang
Apr 25, 2020·Journal of Food Science and Technology·Gabriel Enrique De-la-Torre
May 23, 2020·The Science of the Total Environment·Sheeana GangadooJames Chapman
Jan 10, 2021·The Science of the Total Environment·Zhiquan LiuYunlong Zhao
Mar 2, 2021·Journal of Hazardous Materials·Marko D ProkićCaterina Faggio
Dec 9, 2020·Environmental Pollution·Fazel Abdolahpur MonikhWillie J G M Peijnenburg
May 26, 2021·The Science of the Total Environment·Philippe J ThomasDaniel M Lyons
Jun 7, 2021·Environmental Pollution·Victor Carrasco-NavarroJose-Luis Martínez-Guitarte
Jul 6, 2021·Environmental Science. Nano·P E Redondo-HasselerharmA A Koelmans
Jan 11, 2019·Environmental Science & Technology·Roman LehnerBarbara Rothen-Rutishauser
Nov 27, 2021·Environmental Science. Processes & Impacts·Egle KelpsieneTommy Cedervall
Jan 26, 2022·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Yiming LiYunlong Zhao

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