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In Vivo Mercury (De)Methylation Metabolism in Cephalopods under Different pCO2 Scenarios
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2023-03-28 , DOI: 10.1021/acs.est.2c08513
Sophie Gentès 1, 2 , Antoine Minet 1 , Christelle Lopes 3 , Emmanuel Tessier 2 , Claire Gassie 2 , Rémy Guyoneaud 2 , Peter W Swarzenski 4 , Paco Bustamante 1, 5 , Marc Metian 4 , David Amouroux 2 , Thomas Lacoue-Labarthe 1
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This work quantified the accumulation efficiencies of Hg in cuttlefish, depending on both organic (MeHg) and inorganic (Hg(II)) forms, under increased pCO2 (1600 μatm). Cuttlefish were fed with live shrimps injected with two Hg stable isotopic tracers (Me202Hg and 199Hg(II)), which allowed for the simultaneous quantification of internal Hg accumulation, Hg(II) methylation, and MeHg demethylation rates in different organs. Results showed that pCO2 had no impact on Hg bioaccumulation and organotropism, and both Hg and pCO2 did not influence the microbiota diversity of gut and digestive gland. However, the results also demonstrated that the digestive gland is a key organ for in vivo MeHg demethylation. Consequently, cuttlefish exposed to environmental levels of MeHg could exhibit in vivo MeHg demethylation. We hypothesize that in vivo MeHg demethylation could be due to biologically induced reactions or to abiotic reactions. This has important implications as to how some marine organisms may respond to future ocean change and global mercury contamination.

中文翻译:

不同 pCO2 情景下头足类体内汞(脱)甲基化代谢

这项工作量化了墨鱼体内汞的积累效率,这取决于有机 (MeHg) 和无机 (Hg(II)) 形式,在p CO 2 (1600 μatm)增加的情况下。用注射了两种 Hg 稳定同位素示踪剂(Me 202 Hg 和199 Hg(II))的活虾喂养墨鱼,这允许同时量化不同器官中的内部 Hg 积累、Hg(II) 甲基化和甲基汞去甲基化率。结果表明,p CO 2对Hg的生物富集和有机向性没有影响,Hg和p CO 2不影响肠道和消化腺的微生物群多样性。然而,结果也表明消化腺是体内甲基汞去甲基化的关键器官。因此,暴露于甲基汞环境水平的墨鱼可能会表现出体内甲基汞去甲基化作用。我们假设体内甲基汞去甲基化可能是由于生物诱导反应或非生物反应。这对于一些海洋生物如何应对未来的海洋变化和全球汞污染具有重要意义。
更新日期:2023-03-28
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