Comparison of In Vivo with In Vitro Pharmacokinetics of Mercury Between Methylmercury Chloride and Methylmercury Cysteine Using Rats and Caco2 Cells

The in vivo and in vitro pharmacokinetics of mercury (Hg) were compared between methylmercury chloride (MeHg·Cl) and methylmercury cysteine (MeHg-Cys) using rats and Caco2 cells because humans can be exposed to MeHg compounds through dietary fish. The in vivo pharmacokinetics of Hg immediately after...

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Veröffentlicht in:Archives of environmental contamination and toxicology 2012-11, Vol.63 (4), p.628-636
Hauptverfasser: Mori, Nobuhiro, Yamamoto, Megumi, Tsukada, Eri, Yokooji, Tomoharu, Matsumura, Naoko, Sasaki, Masanori, Murakami, Teruo
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container_end_page 636
container_issue 4
container_start_page 628
container_title Archives of environmental contamination and toxicology
container_volume 63
creator Mori, Nobuhiro
Yamamoto, Megumi
Tsukada, Eri
Yokooji, Tomoharu
Matsumura, Naoko
Sasaki, Masanori
Murakami, Teruo
description The in vivo and in vitro pharmacokinetics of mercury (Hg) were compared between methylmercury chloride (MeHg·Cl) and methylmercury cysteine (MeHg-Cys) using rats and Caco2 cells because humans can be exposed to MeHg compounds through dietary fish. The in vivo pharmacokinetics of Hg immediately after the digestion of MeHg compounds are still obscure. In Caco2 cells, membrane uptake and subcellular distribution of MeHg compounds were examined. When rats received it intravenously, MeHg·Cl showed 20-fold greater plasma and 2-fold greater blood concentrations of Hg than MeHg-Cys, indicating that their pharmacokinetic properties are different. One hour later, however, Hg concentrations in plasma and blood became virtually identical between MeHg·Cl and MeHg-Cys, although blood Hg concentrations were >100-fold greater than those in plasma. When administered into the closed rat’s jejunum loop, MeHg·Cl and MeHg-Cys were rapidly and efficiently taken up by intestinal membranes, and Hg was retained in intestinal membranes for a relatively long time. When administered orally, no difference was observed in plasma and blood Hg concentrations between MeHg·Cl and MeHg-Cys: plasma and blood Hg concentrations increased gradually and reached steady levels at 8 h after administration. In Caco2 cells, uptake of MeHg-Cys was significantly suppressed by l -leucine, although this was not seen with MeHg·Cl. In Caco2 cells, 81 % of Hg was recovered from cytosol fractions and 13 % of Hg from nuclear fractions (including debris) after a 2-h incubation with MeHg-Cys. In conclusion, the mechanism of membrane uptake and volume of distribution in the initial distribution phase were clearly different between MeHg·Cl and MeHg-Cys. However, such pharmacokinetic differences between them disappeared 1 h after intravenous and after oral routes of administration, possibly due to the metabolism in the body.
doi_str_mv 10.1007/s00244-012-9800-5
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The in vivo pharmacokinetics of Hg immediately after the digestion of MeHg compounds are still obscure. In Caco2 cells, membrane uptake and subcellular distribution of MeHg compounds were examined. When rats received it intravenously, MeHg·Cl showed 20-fold greater plasma and 2-fold greater blood concentrations of Hg than MeHg-Cys, indicating that their pharmacokinetic properties are different. One hour later, however, Hg concentrations in plasma and blood became virtually identical between MeHg·Cl and MeHg-Cys, although blood Hg concentrations were &gt;100-fold greater than those in plasma. When administered into the closed rat’s jejunum loop, MeHg·Cl and MeHg-Cys were rapidly and efficiently taken up by intestinal membranes, and Hg was retained in intestinal membranes for a relatively long time. When administered orally, no difference was observed in plasma and blood Hg concentrations between MeHg·Cl and MeHg-Cys: plasma and blood Hg concentrations increased gradually and reached steady levels at 8 h after administration. In Caco2 cells, uptake of MeHg-Cys was significantly suppressed by l -leucine, although this was not seen with MeHg·Cl. In Caco2 cells, 81 % of Hg was recovered from cytosol fractions and 13 % of Hg from nuclear fractions (including debris) after a 2-h incubation with MeHg-Cys. In conclusion, the mechanism of membrane uptake and volume of distribution in the initial distribution phase were clearly different between MeHg·Cl and MeHg-Cys. 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The in vivo pharmacokinetics of Hg immediately after the digestion of MeHg compounds are still obscure. In Caco2 cells, membrane uptake and subcellular distribution of MeHg compounds were examined. When rats received it intravenously, MeHg·Cl showed 20-fold greater plasma and 2-fold greater blood concentrations of Hg than MeHg-Cys, indicating that their pharmacokinetic properties are different. One hour later, however, Hg concentrations in plasma and blood became virtually identical between MeHg·Cl and MeHg-Cys, although blood Hg concentrations were &gt;100-fold greater than those in plasma. When administered into the closed rat’s jejunum loop, MeHg·Cl and MeHg-Cys were rapidly and efficiently taken up by intestinal membranes, and Hg was retained in intestinal membranes for a relatively long time. 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The in vivo pharmacokinetics of Hg immediately after the digestion of MeHg compounds are still obscure. In Caco2 cells, membrane uptake and subcellular distribution of MeHg compounds were examined. When rats received it intravenously, MeHg·Cl showed 20-fold greater plasma and 2-fold greater blood concentrations of Hg than MeHg-Cys, indicating that their pharmacokinetic properties are different. One hour later, however, Hg concentrations in plasma and blood became virtually identical between MeHg·Cl and MeHg-Cys, although blood Hg concentrations were &gt;100-fold greater than those in plasma. When administered into the closed rat’s jejunum loop, MeHg·Cl and MeHg-Cys were rapidly and efficiently taken up by intestinal membranes, and Hg was retained in intestinal membranes for a relatively long time. When administered orally, no difference was observed in plasma and blood Hg concentrations between MeHg·Cl and MeHg-Cys: plasma and blood Hg concentrations increased gradually and reached steady levels at 8 h after administration. In Caco2 cells, uptake of MeHg-Cys was significantly suppressed by l -leucine, although this was not seen with MeHg·Cl. In Caco2 cells, 81 % of Hg was recovered from cytosol fractions and 13 % of Hg from nuclear fractions (including debris) after a 2-h incubation with MeHg-Cys. In conclusion, the mechanism of membrane uptake and volume of distribution in the initial distribution phase were clearly different between MeHg·Cl and MeHg-Cys. However, such pharmacokinetic differences between them disappeared 1 h after intravenous and after oral routes of administration, possibly due to the metabolism in the body.</abstract><cop>New York</cop><pub>Springer-Verlag</pub><pmid>22932937</pmid><doi>10.1007/s00244-012-9800-5</doi><tpages>9</tpages></addata></record>
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source MEDLINE; Springer Nature - Complete Springer Journals
subjects Administration, Intravenous
Administration, Oral
Animal, plant and microbial ecology
Animals
Applied ecology
Biocompatibility
Biological and medical sciences
Biomedical materials
Blood
Body temperature
Caco-2 Cells
Comparative analysis
Cysteine - analogs & derivatives
Cysteine - blood
Cysteine - pharmacokinetics
Earth and Environmental Science
Ecotoxicology
Ecotoxicology, biological effects of pollution
Environment
Environmental Chemistry
Environmental Health
Environmental monitoring
Experiments
Fishes
Fundamental and applied biological sciences. Psychology
General aspects
Humans
In vivo testing
In vivo tests
Laboratory animals
Leucine - pharmacology
Male
Membranes
Mercury
Mercury - blood
Mercury - pharmacokinetics
Methylmercury
Methylmercury Compounds - blood
Methylmercury Compounds - pharmacokinetics
Monitoring/Environmental Analysis
Pharmacokinetics
Physiology
Plasma
Pollution
Rats
Rats, Sprague-Dawley
Small intestine
Soil Science & Conservation
Studies
Surgical implants
Tissue Distribution
title Comparison of In Vivo with In Vitro Pharmacokinetics of Mercury Between Methylmercury Chloride and Methylmercury Cysteine Using Rats and Caco2 Cells
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