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Article Dans Une Revue Environmental Science and Pollution Research Année : 2022

Metabolism of the aquatic pollutant diclofenac in the Lymnaea stagnalis freshwater gastropod

Résumé

The metabolism of organic contaminants in Lymnaea stagnalis freshwater gastropod remains unknown. Yet, pharmaceuticals—like the NSAID diclofenac—are continuously released in the aquatic environment, thereby representing a risk to aquatic organisms. In addition, lower invertebrates may be affected by this pollution since they are likely to bioaccumulate contaminants. The metabolism of pharmaceuticals in L. stagnalis requires further investigation to understand their detoxification mechanisms and characterized the risk posed by contaminant exposure in this species. In this study, a non-targeted strategy using liquid chromatography combined with high-resolution mass spectrometry was applied to highlight metabolites formed in L. stagnalis freshwater snails exposed to 300 μg/L diclofenac for 3 and 7 days. Nineteen metabolites were revealed by this approach, 12 of which were observed for the first time in an aquatic organism exposed to diclofenac. Phase I metabolism involved hydroxylation, with detection of 3’-, 4’-, and 5-hydroxydiclofenac and three dihydroxylated metabolites, as well as cyclization, oxidative decarboxylation, and dehydrogenation, while phase II metabolism consisted of glucose and sulfate conjugation. Among these reactions, the two main DCF detoxification pathways detected in L. stagnalis were hydroxylation (phase I) and glucosidation (phase II).
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Dates et versions

hal-03837672 , version 1 (03-11-2022)

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Lucie Bouly, Hélène Fenet, Jean-Luc Carayon, Elena Gomez, Florence Géret, et al.. Metabolism of the aquatic pollutant diclofenac in the Lymnaea stagnalis freshwater gastropod. Environmental Science and Pollution Research, 2022, ⟨10.1007/s11356-022-21815-5⟩. ⟨hal-03837672⟩
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