A novel assay of cell rubidium uptake using graphite furnace atomic absorption: application to rats on a magnesium-deficient diet.
A novel assay of cell rubidium uptake using graphite furnace atomic absorption: application to rats on a magnesium-deficient diet.
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使用石墨炉原子吸收来检测细胞铷吸收的新方法:应用于缺镁饮食的大鼠。
DOI:
10.1016/j.jnutbio.2005.01.005
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发表时间:
2005
期刊:
影响因子:
--
通讯作者:
Graves,StevenW
中科院分区:
文献类型:
--
作者:
Zhen,Yueying;Franz,KayB;Graves,StevenW
The [Na,K]ATPase or sodium pump (SP) is a ubiquitous membrane cation transport system. Because of its potential participation in the pathophysiology of essential hypertension and cataract formation, the SP is under active investigation to detail its function and control. In this paper, we describe a novel, nonradioactive method of measuring SP ion transport activity in intact red blood cells (RBCs) using graphite furnace atomic absorption measurement of rubidium ion (Rb) uptake. This method provided sensitivity comparable to radioactive techniques, as assessed by experiments with human red blood cells (RBC) and ouabain, a known SP inhibitor, but this analytical approach eliminates the use of radioisotopes common to other Rb uptake assay methods. As a demonstration of its broader utility, the assay was used to assess the effects of dietary magnesium intake on SP-mediated ion transport in the RBCs of diet-controlled rats. Rats on 7 weeks of a magnesium-deficient (MgD) diet showed significant reductions in serum magnesium concentration, although levels remained in the lower region of the reference interval for healthy, magnesium replete animals. Red cell Rb uptake was significantly reduced in cells from the magnesium-restricted animals, demonstrating the sensitivity of Rb uptake to reduced magnesium intake, despite serum levels that fell within the reported normal range, and the utility of this Rb uptake assay in measuring physiological changes in SP function.
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