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  • Title: Decreased prereceptorial glucocorticoid activating capacity in starvation due to an oxidative shift of pyridine nucleotides in the endoplasmic reticulum.
    Author: Kereszturi É, Kálmán FS, Kardon T, Csala M, Bánhegyi G.
    Journal: FEBS Lett; 2010 Nov 19; 584(22):4703-8. PubMed ID: 21035447.
    Abstract:
    Redox state of pyridine nucleotides of the endoplasmic reticulum (ER) lumen was determined in different nutritional conditions. NADPH-dependent cortisone reduction and NADP(+)-dependent cortisol oxidation were measured in rat liver microsomes, by utilizing the luminal 11β-hydroxysteroid dehydrogenase type 1 activity. Cortisone reduction decreased, while cortisol oxidation increased during onward starvation, showing that the luminal NADPH/NADP(+) ratio was substantially decreased. Cortisone or metyrapone addition caused a smaller decrease in NADPH fluorescence in microsomes from starved rats. The results demonstrate that nutrient supply is mirrored by the redox state of ER luminal pyridine nucleotides.
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