Glutathione status and the renal elimination of inorganic mercury in the Mrp2(-/-) mouse.

Glutathione status and the renal elimination of inorganic mercury in the Mrp2(-/-) mouse.
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DOI:
10.1371/journal.pone.0073559
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zalups RK
Zalups RK
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bridges CC;Joshee L;van den Heuvel JJ;Russel FG;Zalups RK

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多药耐药相关蛋白 (MRP) 2 和 4 位于近端肾小管上皮细胞中,参与肾脏对异生物质的消除。 MRP2 还与肾脏和肝脏汞消除有关。目前的研究检验了以下假设:MRP2 和 MRP4 参与肾脏和肝脏对无机汞 (Hg2+) 的处理。我们检查了 Mrp2−/− 小鼠中 Hg2+ 的分布,并评估了汞缀合物在含有人 MRP4 的内外膜囊泡中的转运。由于 MRP2 已被证明利用谷胱甘肽 (GSH) 来转运选定的底物,因此我们检查了 Mrp2−/− 和 FVB 小鼠中 GSH 和半胱氨酸的肾脏浓度以及谷氨酸半胱氨酸连接酶 (GCL) 的表达。还在这些小鼠中评估了 Hg2+ 暴露对肾脏 GSH 水平的影响。我们的数据表明,MRP2(而非 MRP4)参与 Hg2+ 的近端肾小管输出。此外,Mrp2−/− 小鼠的 GSH 水平较高,接触 Hg2+ 会降低肾脏 GSH 水平。在正常条件下和暴露于 HgCl2 后,Mrp2−/− 小鼠中 GCL 的表达也发生改变。这项研究提供了有关 Hg2+ 转运以及 Hg2+ 暴露对 GSH 水平影响的重要新数据。
Multidrug resistance-associated proteins (MRP) 2 and 4 are localized in proximal tubular epithelial cells and participate in the renal elimination of xenobiotics. MRP2 has also been implicated in the renal and hepatic elimination of mercury. The current study tested the hypothesis that MRP2 and MRP4 are involved in renal and hepatic handling of inorganic mercury (Hg2+). We examined the disposition of Hg2+ in Mrp2−/− mice and assessed the transport of mercuric conjugates in inside-out membrane vesicles containing human MRP4. Since MRP2 has been shown to utilize glutathione (GSH) for transport of select substrates, we examined renal concentrations of GSH and cysteine and the expression of glutamate cysteine ligase (GCL) in Mrp2−/− and FVB mice. The effect of Hg2+ exposure on renal GSH levels was also assessed in these mice. Our data suggest that MRP2, but not MRP4, is involved in proximal tubular export of Hg2+. In addition, GSH levels are greater in Mrp2−/− mice and exposure to Hg2+ reduced renal levels of GSH. Expression of GCL was also altered in Mrp2−/− mice under normal conditions and following exposure to HgCl2. This study provides important novel data regarding the transport of Hg2+ and the effect of Hg2+ exposure on GSH levels.
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