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Maternal selenium deficiency enhances the fetolethal toxicity of methyl mercury.

Abstract：

:The effect of maternal selenium deficiency on methyl mercury fetotoxicity was examined in the ICR strain of mice. Pregnant mice were fed either selenium-deficient diets based on torula yeast or selenium-supplemented diets which were identical to the former except that 0.1, 0.2, or 0.4 mg of selenium per kilogram of diet was added as sodium selenite. Fetolethality of methyl mercury was exacerbated by maternal selenium deficiency when mothers were administered sc 15, 25, or 35 mumol/kg/day of methylmercuric chloride (MMC) on the 13, 14, and 15th days of pregnancy. One-tenth part per million of selenium in the diet was sufficient to protect the fetuses against MMC fetolethality when dams were administered 25 mumol/kg/day of MMC. Mercury concentrations in maternal and fetal tissues were independent of the dietary selenium level. Selenium concentration and glutathione peroxidase (GSH-Px) activity in maternal tissues were unaffected by MMC administration. In fetal liver, on the other hand, selenium concentration was increased and GSH-Px activity was decreased concurrently by maternal MMC administration in the selenium-supplemented groups. Therefore, as far as GSH-Px activity was concerned, the bioavailability of selenium was markedly decreased in fetal liver by maternal injection of MMC. The increase in selenium content in fetal liver, which was observed only in the selenium-supplemented groups, may play an important role in protection against fetolethal toxicity of MMC.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Nishikido N,Furuyashiki K,Naganuma A,Suzuki T,Imura N

doi

10.1016/0041-008x(87)90207-9

subject

Has Abstract

pub_date

1987-05-01 00:00:00

pages

322-8

issue

3

eissn

0041-008X

issn

1096-0333

journal_volume

88

pub_type

杂志文章

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