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A multi-biomarker approach for the early assessment of the toxicity of hospital wastewater using the freshwater organism Daphnia magna

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Abstract

Hospital wastewater (HWW) contains different hazardous substances resulting from a combination of medical and non-medical activities of hospitals, including pharmaceutical residues. These substances may represent a threat to the aquatic environment if they do not follow specific treatment processes. Therefore, we aimed to investigate the effects of the untreated effluent collected from a general hospital in Mahdia City (Tunisia) on neonatal stages of the freshwater crustacean Daphnia magna. Test organisms were exposed to three proportions (3.12%, 6.25%, and 12.5% v/v) of HWW. After 48 h of exposure, a battery of biomarkers was measured, including the quantification of antioxidant enzymes [catalase (CAT) and total and selenium-dependent glutathione peroxidase (total GPx; Se-GPx)], phase II biotransformation isoenzymes glutathione-S-transferases (GSTs), cyclooxygenases (COX) involved in the regulation of the inflammatory process, and total cholinesterases (ChEs) activities. Lipid peroxidation (LPO) was measured to estimate oxidative damage. The here-obtained results showed significant decreases of CAT and GSTs activities and also on LPO content in daphnids, whereas Se-GPx activity was significantly increased in a dose-dependent manner. Impairment of cholinesterasic and COX activities were also observed, with a significant decrease of ChEs and an increase of COX enzymatic activities. Considering these findings, HWW was capable of inducing an imbalance of the antioxidant defense system, but without resulting in oxidative damage in test organisms, suggesting that peroxidases and alternative detoxifying pathways were able to prevent the oxidant potential of several drugs, which were found in the tested effluents. In general, this study demonstrated the toxicity of hospital effluents, measured in terms of the potential impairment of key pathways, namely neurotransmission, antioxidant defense, and inflammatory homeostasis of crustaceans.

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Funding

This research was funded by Fundação para a Ciência e a Tecnologia, FCT (project ECO-R-pharmplast – Ecotoxicity of realistic combinations of pharmaceutical drugs and microplastics in marine ecosystems, reference POCI-01–0145-FEDER-029203). FCT also funded the research center CESAM, in which the research was conducted (UIDB/50017/2020 + UIDP/50017/2020); CESAM was also co-funded by ERDF, within the PT2020 Partnership Agreement and Compete 2020. This research was also funded by the Ministry of Higher Education and Scientific Research in Tunisia. None of these sources of funding had any role in the design of the study and collection, analysis, and interpretation of data and in the writing of the manuscript.

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All authors contributed to this work.

Sabrine Afsa: conceptualization, visualization, methodology, formal analysis, data curation, writing – original draft.

Madalena Vieira: methodology; formal analysis; software; data curation.

Ana Filipa Nogueira: methodology, formal analysis.

Hedi ben Mansour: supervision, review and editing.

Bruno Nunes: supervision, validation, writing – review and editing.

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Correspondence to Bruno Nunes.

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Afsa, S., Vieira, M., Nogueira, A. et al. A multi-biomarker approach for the early assessment of the toxicity of hospital wastewater using the freshwater organism Daphnia magna. Environ Sci Pollut Res 29, 19132–19147 (2022). https://doi.org/10.1007/s11356-021-16977-7

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  • DOI: https://doi.org/10.1007/s11356-021-16977-7

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