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Accumulation and detoxication responses of the gastropod lymnaea stagnalis to single and combined exposures to natural (cyanobacteria) and anthropogenic (the herbicide RoundUp{reg} Flash) stressors.

Lance, Emilie; Desprat, Julia; Holbech, Bente Frost; Gérard, Claudia; Bormans, Myriam; Lawton, Linda A.; Edwards, Christine; Wiegand, Claudia

Authors

Emilie Lance

Julia Desprat

Bente Frost Holbech

Claudia Gérard

Myriam Bormans

Linda A. Lawton

Christine Edwards

Claudia Wiegand

Abstract

Freshwater gastropods are increasingly exposed to multiple stressors in the field such as the herbicide glyphosate in Roundup formulations and cyanobacterial blooms either producing or not producing microcystins (MCs), potentially leading to interacting effects. Here, the responses of Lymnaea stagnalis to a 21-day exposure to non-MC or MC-producing (33{A0}?g{A0}L?1) Planktothrix agardhii alone or in combination with the commercial formulation RoundUp{reg} Flash at a concentration of 1{A0}?g{A0}L?1 glyphosate, followed by 14{A0}days of depuration, were studied via i) accumulation of free and bound MCs in tissues, and ii) activities of anti-oxidant (catalase CAT) and biotransformation (glutathione-S-transferase GST) enzymes. During the intoxication, the cyanobacterial exposure induced an early increase of CAT activity, independently of the MC content, probably related to the production of secondary cyanobacterial metabolites. The GST activity was induced by RoundUp{reg} Flash alone or in combination with non MC-producing cyanobacteria, but was inhibited by MC-producing cyanobacteria with or without RoundUp{reg} Flash. Moreover, MC accumulation in L. stagnalis was 3.2 times increased when snails were concomitantly exposed to MC-producing cyanobacteria with RoundUp{reg}, suggesting interacting effects of MCs on biotransformation processes. The potent inhibition of detoxication systems by MCs and RoundUp{reg} Flash was reversible during the depuration, during which CAT and GST activities were significantly higher in snails previously exposed to MC-producing cyanobacteria with or without RoundUp{reg} Flash than in other conditions, probably related to the oxidative stress caused by accumulated MCs remaining in tissues.

Journal Article Type Article
Publication Date Aug 1, 2016
Journal Aquatic toxicology
Print ISSN 0166-445X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 177
Pages 116-124
Institution Citation LANCE, E., DESPRAT, J., HOLBECH, B.F., GERARD, C., BORMANS, M., LAWTON, L.A., EDWARDS, C. and WIEGAND, C. 2016. Accumulation and detoxication responses of the gastropod lymnaea stagnalis to single and combined exposures to natural (cyanobacteria) and anthropogenic (the herbicide RoundUp{reg} Flash) stressors. Aquatic toxicology [online], 177, pages 116-124. Available from: https://doi.org/10.1016/j.aquatox.2016.05.024
DOI https://doi.org/10.1016/j.aquatox.2016.05.024
Keywords Gastropod; Cyanobacteria; Microcystins; Glyphosate (RoundUp/Flash); Oxidative stress; Biotransformation; Accumulation

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