Magnesium and calcium deficiencies additively increase zinc concentrations and metallothionein expression in the rat liver

The British Journal of Nutrition
Megumi KotaniTohru Matsui

Abstract

Mg deficiency increases the concentration of Zn in the liver. We investigated the effect of Mg deficiency on the expression of Zn-regulating factors such as Zn transporters and metallothionein (MT) in the rat liver. Because Ca deficiency alleviates some of the effects of Mg deficiency, we also investigated the interactions associated with Ca and Mg deficiencies. Growing male rats were given a control diet, a Mg-deficient diet, a Ca-deficient diet and a Mg- and Ca-deficient diet for 3 weeks. Mg and Ca deficiencies additively increased the mRNA levels of MT-1 and MT-2, the MT protein concentration and the concentration of Zn in the liver. The hepatic mRNA level of Zip14 increased with Mg deficiency but not with Ca deficiency. The dietary treatments did not affect the mRNA levels of other Zn transporters such as Zip1, Zip5, ZnT1, ZnT5 and ZnT6 in the liver. Ca deficiency was found to decrease the amount of femoral Zn and increase serum Zn concentration. This did not occur in the case of Mg deficiency. These results suggest that Mg deficiency enhances hepatic Zn uptake by the up-regulation of Zip14 expression and increases hepatic Zn concentration, leading to the enhancement of MT expression. Ca deficiency causes a transfer of Zn f...Continue Reading

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Citations

Jan 31, 2014·Journal of Nutritional Science and Vitaminology·Satoshi TakemotoTohru Matsui
Jul 8, 2014·Environmental Science and Pollution Research International·Ruizi GuoYongxue Sun
Nov 6, 2013·The Journal of Medical Investigation : JMI·Minoru HigashimotoMasao Sato
Nov 9, 2016·The British Journal of Nutrition·Mei ShigematsuTohru Matsui
Mar 1, 2018·The Journal of Nutrition·Tolunay B Aydemir, Robert J Cousins
Jul 6, 2020·Journal of the Science of Food and Agriculture·Manami NishiyamaTohru Matsui

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