Microplastic Fibers Increase Sublethal Effects of AgNP and AgNO 3 in Daphnia magna by Changing Cellular Energy Allocation.

Autor: Tourinho PS; Department of Environmental Chemistry, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Prague, Czech Republic., Silva ARR; Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal., Santos CSA; Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal., Prodana M; Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal., Ferreira V; Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal., Habibullah G; Department of Biochemistry and Microbiology, Faculty of Food and Biochemical Technology, University of Chemistry and Technology Prague, Prague, Czech Republic., Kočí V; Department of Environmental Chemistry, Faculty of Environmental Technology, University of Chemistry and Technology Prague, Prague, Czech Republic., van Gestel CAM; Department of Ecological Science, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands., Loureiro S; Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal.
Jazyk: angličtina
Zdroj: Environmental toxicology and chemistry [Environ Toxicol Chem] 2022 Apr; Vol. 41 (4), pp. 896-904. Date of Electronic Publication: 2021 Jul 22.
DOI: 10.1002/etc.5136
Abstrakt: The effects of combined exposure to microplastics and contaminants are still not completely understood. To fill this gap, we assessed the effects of polyethylene terephthalate microplastic fibers (100 mg/L; 360 µm average length) on the toxicity of silver nanoparticles (AgNPs; 32 nm) and silver nitrate (AgNO 3 ; 0.1-10 µg Ag/L) to Daphnia magna. Acute immobilization (median effect concentration [EC50]) and cellular energy allocation (CEA; ratio between available energy and energy consumption) were determined in neonates (<24 h old) and juveniles (7 d old), respectively. The 48-h EC50 for AgNP and AgNO 3 (2.6 and 0.67 µg Ag/L, respectively) was not affected by the presence of microplastic fibers (2.2 and 0.85 µg Ag/L, respectively). No decrease in the available energy was observed: lipid, carbohydrate, and protein contents were unaffected. However, a significant increase in energy consumption was observed in animals exposed to AgNO 3 (250% compared with control) and to the combination of microplastic fibers with AgNP (170%) and AgNO 3 (260%). The exposure to microplastic fibers alone or in combination with both Ag forms decreased the CEA (values were 55-75% of control values). Our results show that after short-term exposure (48 h), microplastic fibers increased Ag toxicity at a subcellular level (i.e., CEA), but not at the individual level (i.e., immobilization). These results highlight the importance of combining different levels of biological organization to fully assess the ecotoxicological effects of plastics in association with environmental contaminants. Environ Toxicol Chem 2022;41:896-904. © 2021 SETAC.
(© 2021 SETAC.)
Databáze: MEDLINE
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