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. 1969 Oct;48(10):1957–1966. doi: 10.1172/JCI106162

Effect of flavin compounds on glutathione reductase activity: in vivo and in vitro studies

Ernest Beutler 1
PMCID: PMC322432  PMID: 5822598

Abstract

Increases or decreases of red cell glutathione reductase (GR) have been described in connection with many clinical abnormalities. We find that GR activity as measured in hemolysates represents only a portion of the available GR activity. The addition of small amounts of flavin adenine dinucleotide (FAD), but not of flavin mononucleotide or riboflavin, activates the GR of hemolysates. 1 μM FAD results in a maximal activation within 10 min; gradually increasing activation occurs at much lower, for example, 20 mμM FAD concentrations. Once FAD has activated GR, dilution or dialysis does not reverse activation of the enzyme. Activation of GR by FAD can be inhibited by adenosine triphosphate (ATP), and to a lesser extent by adenosine diphosphate (ADP) and adenosine monophosphate (AMP), if these adenine nucleotides are added before the addition of FAD, but only to a slight extent if FAD is added before the adenine nucleotides. The addition of FAD to GR does not alter its electrophoretic mobility but produces intensification of the bands.

The administration of 5 mg of riboflavin daily produces marked stimulation of red cell GR activity within only 2 days. After cessation of riboflavin administration, the GR activity again begins to fall. The degree of stimulation of GR activity by riboflavin is inversely correlated with the level of dietary riboflavin intake. The base line GR activity of normal individuals is directly correlated with the level of dietary riboflavin intake. The previously unexplained variations of glutathione reductase in health and disease must be reevaluated in light of the state of riboflavin nutrition and metabolism of the subject.

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1957

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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