In vivo formation of natural HgSe nanoparticles in the liver and brain of pilot whales
- University of Aberdeen, Aberdeen (United Kingdom). Department of Chemistry, Trace Element Speciation Laboratory, Meston Walk; DOE/OSTI
- University of Aberdeen, Aberdeen (United Kingdom). Department of Chemistry, Trace Element Speciation Laboratory, Meston Walk
- National Risk Management Research Laboratory, Cincinnati, OH (United States). United States Environmental Protection Agency
- University of South Australia, Mawson Lakes (South Australia). Future Industries Institute
- The University of Queensland, St Lucia, Queensland (Australia). School Agriculture and Food Sciences
- Technical University of Denmark (Denmark). National Food Institute
- Agilent Technologies Ltd, 5500 Lakeside, Cheadle (United Kingdom)
- SAC Wildlife Unit, Inverness (United Kingdom)
- University of Aberdeen, Main Street, Newburgh, Aberdeenshire (United KIngdom). Oceanlab
To understand the biochemistry of methylmercury (MeHg) that leads to the formation of mercury-selenium (Hg-Se) clusters is a long outstanding challenge that promises to deepen our knowledge of MeHg detoxification and the role Se plays in this process. Here, we show that mercury selenide (HgSe) nanoparticles in the liver and brain of long-finned pilot whales are attached to Se-rich structures and possibly act as a nucleation point for the formation of large Se-Hg clusters, which can grow with age to over 5 μm in size. The detoxification mechanism is fully developed from the early age of the animals, with particulate Hg found already in juvenile tissues. As a consequence of MeHg detoxification, Se-methionine, the selenium pool in the system is depleted in the efforts to maintain essential levels of Se-cysteine. This study provides evidence of so far unreported depletion of the bioavailable Se pool, a plausible driving mechanism of demonstrated neurotoxic effects of MeHg in the organism affected by its high dietary intake.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1624859
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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