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- W2439390823 abstract "The effect of dietary Mg deficiency on nitric oxide (NO) production and its role in mediating oxidative depletion of red blood cell (RBC) glutathione in rats were investigated. Male Sprague-Dawley rats were placed on Mg-deficient or Mg-sufficient diets for up to 3 wk. Plasma nitrate plus nitrite levels, determined by the Escherichia coli reductase/Griess reagent procedures, increased 1.7-fold during the 1st wk and increased 2- to 2.4-fold during the 2nd and 3rd wk on the Mg-deficient diet. In association, substantial losses (approximately 50%) of RBC glutathione occurred during the 2nd and 3rd wk. Administration of the NO synthesis inhibitor NG-nitro-L-arginine methyl ester (L-NAME) in drinking water (0.5 mg/ml) effectively blunted the increases in plasma nitrate/nitrite during Mg deficiency. Concomitantly, losses of RBC glutathione exhibited by Mg-deficient rats were significantly attenuated. Packed RBCs, obtained from Mg-deficient but not from Mg-sufficient animals, displayed a prominent nitrosyl hemoglobin signal detected by electron spin resonance spectroscopy; the signals of the samples from the L-NAME-treated Mg-deficient rats were greatly reduced. With isolated RBCs, losses of the glutathione could be induced directly by peroxynitrite or 3-morpholinosydnonimine, which generates NO + .O2-, but not by NO (from sodium nitroprusside) alone, in a concentration-dependent manner. The results clearly indicate that NO overproduction occurs and participates in RBC glutathione loss during Mg deficiency. Because neutrophil activation also occurs, we suggest that NO might interact with superoxide anions to form peroxynitrite, which then directly oxidizes RBC glutathione." @default.
- W2439390823 created "2016-06-24" @default.
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- W2439390823 date "1996-07-01" @default.
- W2439390823 modified "2023-09-29" @default.
- W2439390823 title "Enhanced NO production during Mg deficiency and its role in mediating red blood cell glutathione loss" @default.
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- W2439390823 doi "https://doi.org/10.1152/ajpcell.1996.271.1.c385" @default.
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