Measuring brain manganese and iron accumulation in rats following 14 weeks of low-dose manganese treatment using atomic absorption spectroscopy and magnetic resonance imaging

被引:53
作者
Fitsanakis, Vanessa A. [1 ]
Zhang, Na [2 ,3 ]
Anderson, Joel G. [4 ]
Erikson, Keith M. [4 ]
Avison, Malcolm J. [2 ,3 ,5 ,6 ,7 ]
Gore, John C. [2 ,3 ,5 ,6 ,7 ]
Aschner, Michael [8 ,9 ,10 ]
机构
[1] Kings Coll London, Dept Biol, Bristol, TN 37620 USA
[2] Vanderbilt Univ, Vanderbilt Univ Inst Imaging Sci, Nashville, TN 37232 USA
[3] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37232 USA
[4] Univ N Carolina, Dept Nutr, Greensboro, NC 27412 USA
[5] Vanderbilt Univ, Dept Radiol & Radiol Sci, Nashville, TN 37232 USA
[6] Vanderbilt Univ, Dept Biomed Engn, Nashville, TN 37232 USA
[7] Vanderbilt Univ, Dept Physiol & Mol Biophys, Nashville, TN 37232 USA
[8] Vanderbilt Univ, Vanderbilt Univ Med Ctr, Dept Pharmacol, Ctr Mol Neurosci, Nashville, TN 37232 USA
[9] Vanderbilt Univ, Vanderbilt Univ Med Ctr, Dept Pediat, Ctr Mol Neurosci, Nashville, TN 37232 USA
[10] Vanderbilt Univ, Ctr Mol Toxicol, Nashville, TN 37232 USA
关键词
iron deficiency (ID); iron supplementation; brain Mn accumulation; MMT; MRI;
D O I
10.1093/toxsci/kfn019
中图分类号
R99 [毒物学(毒理学)];
学科分类号
100405 ;
摘要
Chronic exposure to manganese (Mn) may lead to a movement disorder due to preferential Mn accumulation in the globus pallidus and other basal ganglia nuclei. Iron (Fe) deficiency also results in increased brain Mn levels, as well as dysregulation of other trace metals. The relationship between Mn and Fe transport has been attributed to the fact that both metals can be transported via the same molecular mechanisms. It is not known, however, whether brain Mn distribution patterns due to increased Mn exposure vs. Fe deficiency are the same, or whether Fe supplementation would reverse or inhibit Mn deposition. To address these questions, we utilized four distinct experimental populations. Three separate groups of male Sprague-Dawley rats on different diets (control diet [MnT], Fe deficient [FeD], or Fe supplemented [FeS]) were given weekly intravenous Mn injections (3 mg Mn/kg body mass) for 14 weeks, whereas control (CN) rats were fed the control diet and received sterile saline injections. At the conclusion of the study, both blood and brain Mn and Fe levels were determined by atomic absorption spectroscopy and magnetic resonance imaging. The data indicate that changes in dietary Fe levels (either increased or decreased) result in regionally specific increases in brain Mn levels compared with CN or MnT animals. Furthermore, there was no difference in either Fe or Mn accumulation between FeS or FeD animals. These data suggest that dietary Fe manipulation, whether increased or decreased, may contribute to brain Mn deposition in populations vulnerable to increased Mn exposure.
引用
收藏
页码:116 / 124
页数:9
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