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Organ-specific accumulation, transportation, and elimination of methylmercury and inorganic mercury in a low Hg accumulating fish
Peng, Xiaoyan; Liu, Fengjie; Wang, Wen-Xiong
2016
Source PublicationEnvironmental Toxicology and Chemistry
Volume35Issue:8Pages:2074-2083
AbstractLow mercury (Hg) concentrations down to several nanograms Hg per gram of wet tissue are documented in certain fish species such as herbivorous fish, and the underlying mechanisms remain speculative. In the present study, bioaccumulation and depuration patterns of inorganic Hg(II) and methylmercury (MeHg) in a herbivorous rabbitfish Siganus canaliculatus were investigated at organ and subcellular levels following waterborne or dietary exposures. The results showed that the efflux rate constants of Hg(II) and MeHg were 0.104d(-1) and 0.024d(-1), respectively, and are probably the highest rate constants recorded in fish thus far. The dietary MeHg assimilation efficiency (68%) was much lower than those in other fish species (approximate to 90%). The predominant distribution of MeHg in fish muscle was attributable to negligible elimination of MeHg from muscle (<0) and efficient elimination of MeHg from gills (0.12d(-1)), liver (0.17d(-1)), and intestine (0.20d(-1)), as well as efficient transportation of MeHg from other organs into muscle. In contrast, Hg(II) was much more slowly distributed into muscle but was efficiently eliminated by the intestine (0.13d(-1)). Subcellular distribution indicated that some specific membrane proteins in muscle were the primary binding pools for MeHg, and both metallothionein-like proteins and Hg-rich granules were the important components in eliminating both MeHg and Hg(II). Overall, the present study's results suggest that the low tissue Hg concentration in the rabbitfish was partly explained by its unique biokinetics.
KeywordBiokinetics Fish Hg Mehg Subcellular Distribution
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6516
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Peng, Xiaoyan,Liu, Fengjie,Wang, Wen-Xiong. Organ-specific accumulation, transportation, and elimination of methylmercury and inorganic mercury in a low Hg accumulating fish[J]. Environmental Toxicology and Chemistry,2016,35(8):2074-2083.
APA Peng, Xiaoyan,Liu, Fengjie,&Wang, Wen-Xiong.(2016).Organ-specific accumulation, transportation, and elimination of methylmercury and inorganic mercury in a low Hg accumulating fish.Environmental Toxicology and Chemistry,35(8),2074-2083.
MLA Peng, Xiaoyan,et al."Organ-specific accumulation, transportation, and elimination of methylmercury and inorganic mercury in a low Hg accumulating fish".Environmental Toxicology and Chemistry 35.8(2016):2074-2083.
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